Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * linux/fs/ext4/super.c
4 : : *
5 : : * Copyright (C) 1992, 1993, 1994, 1995
6 : : * Remy Card (card@masi.ibp.fr)
7 : : * Laboratoire MASI - Institut Blaise Pascal
8 : : * Universite Pierre et Marie Curie (Paris VI)
9 : : *
10 : : * from
11 : : *
12 : : * linux/fs/minix/inode.c
13 : : *
14 : : * Copyright (C) 1991, 1992 Linus Torvalds
15 : : *
16 : : * Big-endian to little-endian byte-swapping/bitmaps by
17 : : * David S. Miller (davem@caip.rutgers.edu), 1995
18 : : */
19 : :
20 : : #include <linux/module.h>
21 : : #include <linux/string.h>
22 : : #include <linux/fs.h>
23 : : #include <linux/time.h>
24 : : #include <linux/vmalloc.h>
25 : : #include <linux/slab.h>
26 : : #include <linux/init.h>
27 : : #include <linux/blkdev.h>
28 : : #include <linux/backing-dev.h>
29 : : #include <linux/parser.h>
30 : : #include <linux/buffer_head.h>
31 : : #include <linux/exportfs.h>
32 : : #include <linux/vfs.h>
33 : : #include <linux/random.h>
34 : : #include <linux/mount.h>
35 : : #include <linux/namei.h>
36 : : #include <linux/quotaops.h>
37 : : #include <linux/seq_file.h>
38 : : #include <linux/ctype.h>
39 : : #include <linux/log2.h>
40 : : #include <linux/crc16.h>
41 : : #include <linux/dax.h>
42 : : #include <linux/cleancache.h>
43 : : #include <linux/uaccess.h>
44 : : #include <linux/iversion.h>
45 : : #include <linux/unicode.h>
46 : :
47 : : #include <linux/kthread.h>
48 : : #include <linux/freezer.h>
49 : :
50 : : #include "ext4.h"
51 : : #include "ext4_extents.h" /* Needed for trace points definition */
52 : : #include "ext4_jbd2.h"
53 : : #include "xattr.h"
54 : : #include "acl.h"
55 : : #include "mballoc.h"
56 : : #include "fsmap.h"
57 : :
58 : : #define CREATE_TRACE_POINTS
59 : : #include <trace/events/ext4.h>
60 : :
61 : : static struct ext4_lazy_init *ext4_li_info;
62 : : static struct mutex ext4_li_mtx;
63 : : static struct ratelimit_state ext4_mount_msg_ratelimit;
64 : :
65 : : static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
66 : : unsigned long journal_devnum);
67 : : static int ext4_show_options(struct seq_file *seq, struct dentry *root);
68 : : static int ext4_commit_super(struct super_block *sb, int sync);
69 : : static void ext4_mark_recovery_complete(struct super_block *sb,
70 : : struct ext4_super_block *es);
71 : : static void ext4_clear_journal_err(struct super_block *sb,
72 : : struct ext4_super_block *es);
73 : : static int ext4_sync_fs(struct super_block *sb, int wait);
74 : : static int ext4_remount(struct super_block *sb, int *flags, char *data);
75 : : static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 : : static int ext4_unfreeze(struct super_block *sb);
77 : : static int ext4_freeze(struct super_block *sb);
78 : : static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 : : const char *dev_name, void *data);
80 : : static inline int ext2_feature_set_ok(struct super_block *sb);
81 : : static inline int ext3_feature_set_ok(struct super_block *sb);
82 : : static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 : : static void ext4_destroy_lazyinit_thread(void);
84 : : static void ext4_unregister_li_request(struct super_block *sb);
85 : : static void ext4_clear_request_list(void);
86 : : static struct inode *ext4_get_journal_inode(struct super_block *sb,
87 : : unsigned int journal_inum);
88 : :
89 : : /*
90 : : * Lock ordering
91 : : *
92 : : * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
93 : : * i_mmap_rwsem (inode->i_mmap_rwsem)!
94 : : *
95 : : * page fault path:
96 : : * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
97 : : * page lock -> i_data_sem (rw)
98 : : *
99 : : * buffered write path:
100 : : * sb_start_write -> i_mutex -> mmap_sem
101 : : * sb_start_write -> i_mutex -> transaction start -> page lock ->
102 : : * i_data_sem (rw)
103 : : *
104 : : * truncate:
105 : : * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
106 : : * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
107 : : * i_data_sem (rw)
108 : : *
109 : : * direct IO:
110 : : * sb_start_write -> i_mutex -> mmap_sem
111 : : * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
112 : : *
113 : : * writepages:
114 : : * transaction start -> page lock(s) -> i_data_sem (rw)
115 : : */
116 : :
117 : : #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
118 : : static struct file_system_type ext2_fs_type = {
119 : : .owner = THIS_MODULE,
120 : : .name = "ext2",
121 : : .mount = ext4_mount,
122 : : .kill_sb = kill_block_super,
123 : : .fs_flags = FS_REQUIRES_DEV,
124 : : };
125 : : MODULE_ALIAS_FS("ext2");
126 : : MODULE_ALIAS("ext2");
127 : : #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128 : : #else
129 : : #define IS_EXT2_SB(sb) (0)
130 : : #endif
131 : :
132 : :
133 : : static struct file_system_type ext3_fs_type = {
134 : : .owner = THIS_MODULE,
135 : : .name = "ext3",
136 : : .mount = ext4_mount,
137 : : .kill_sb = kill_block_super,
138 : : .fs_flags = FS_REQUIRES_DEV,
139 : : };
140 : : MODULE_ALIAS_FS("ext3");
141 : : MODULE_ALIAS("ext3");
142 : : #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
143 : :
144 : : /*
145 : : * This works like sb_bread() except it uses ERR_PTR for error
146 : : * returns. Currently with sb_bread it's impossible to distinguish
147 : : * between ENOMEM and EIO situations (since both result in a NULL
148 : : * return.
149 : : */
150 : : struct buffer_head *
151 : 0 : ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
152 : : {
153 : 0 : struct buffer_head *bh = sb_getblk(sb, block);
154 : :
155 [ # # ]: 0 : if (bh == NULL)
156 : : return ERR_PTR(-ENOMEM);
157 [ # # ]: 0 : if (buffer_uptodate(bh))
158 : 0 : return bh;
159 : 0 : ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
160 : 0 : wait_on_buffer(bh);
161 [ # # ]: 0 : if (buffer_uptodate(bh))
162 : 0 : return bh;
163 : 0 : put_bh(bh);
164 : 0 : return ERR_PTR(-EIO);
165 : : }
166 : :
167 : : static int ext4_verify_csum_type(struct super_block *sb,
168 : : struct ext4_super_block *es)
169 : : {
170 [ - + ]: 207 : if (!ext4_has_feature_metadata_csum(sb))
171 : : return 1;
172 : :
173 : 0 : return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
174 : : }
175 : :
176 : : static __le32 ext4_superblock_csum(struct super_block *sb,
177 : : struct ext4_super_block *es)
178 : : {
179 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
180 : : int offset = offsetof(struct ext4_super_block, s_checksum);
181 : : __u32 csum;
182 : :
183 : 0 : csum = ext4_chksum(sbi, ~0, (char *)es, offset);
184 : :
185 : : return cpu_to_le32(csum);
186 : : }
187 : :
188 : 207 : static int ext4_superblock_csum_verify(struct super_block *sb,
189 : : struct ext4_super_block *es)
190 : : {
191 [ - + ]: 207 : if (!ext4_has_metadata_csum(sb))
192 : : return 1;
193 : :
194 : 0 : return es->s_checksum == ext4_superblock_csum(sb, es);
195 : : }
196 : :
197 : 9086 : void ext4_superblock_csum_set(struct super_block *sb)
198 : : {
199 : 9086 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
200 : :
201 [ - + ]: 9086 : if (!ext4_has_metadata_csum(sb))
202 : 9086 : return;
203 : :
204 : 0 : es->s_checksum = ext4_superblock_csum(sb, es);
205 : : }
206 : :
207 : 0 : void *ext4_kvmalloc(size_t size, gfp_t flags)
208 : : {
209 : : void *ret;
210 : :
211 : 0 : ret = kmalloc(size, flags | __GFP_NOWARN);
212 [ # # ]: 0 : if (!ret)
213 : 0 : ret = __vmalloc(size, flags, PAGE_KERNEL);
214 : 0 : return ret;
215 : : }
216 : :
217 : 0 : void *ext4_kvzalloc(size_t size, gfp_t flags)
218 : : {
219 : : void *ret;
220 : :
221 : 0 : ret = kzalloc(size, flags | __GFP_NOWARN);
222 [ # # ]: 0 : if (!ret)
223 : 0 : ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
224 : 0 : return ret;
225 : : }
226 : :
227 : 83331 : ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
228 : : struct ext4_group_desc *bg)
229 : : {
230 : 188604 : return le32_to_cpu(bg->bg_block_bitmap_lo) |
231 : 94302 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
232 [ # # - + : 94302 : (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
- + ]
233 : : }
234 : :
235 : 168276 : ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
236 : : struct ext4_group_desc *bg)
237 : : {
238 : 358494 : return le32_to_cpu(bg->bg_inode_bitmap_lo) |
239 : 179247 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
240 [ # # - + : 179247 : (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
- + ]
241 : : }
242 : :
243 : 2129815 : ext4_fsblk_t ext4_inode_table(struct super_block *sb,
244 : : struct ext4_group_desc *bg)
245 : : {
246 : 4281572 : return le32_to_cpu(bg->bg_inode_table_lo) |
247 : 2140786 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
248 [ # # - + : 2140786 : (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
- + ]
249 : : }
250 : :
251 : 85264 : __u32 ext4_free_group_clusters(struct super_block *sb,
252 : : struct ext4_group_desc *bg)
253 : : {
254 : 192470 : return le16_to_cpu(bg->bg_free_blocks_count_lo) |
255 : 96235 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
256 [ - + - + ]: 96235 : (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
257 : : }
258 : :
259 : 733427 : __u32 ext4_free_inodes_count(struct super_block *sb,
260 : : struct ext4_group_desc *bg)
261 : : {
262 : 1488796 : return le16_to_cpu(bg->bg_free_inodes_count_lo) |
263 : 744398 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
264 [ - + # # : 744398 : (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
- + ]
265 : : }
266 : :
267 : 58192 : __u32 ext4_used_dirs_count(struct super_block *sb,
268 : : struct ext4_group_desc *bg)
269 : : {
270 : 138326 : return le16_to_cpu(bg->bg_used_dirs_count_lo) |
271 : 69163 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
272 [ - + - + ]: 69163 : (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
273 : : }
274 : :
275 : 0 : __u32 ext4_itable_unused_count(struct super_block *sb,
276 : : struct ext4_group_desc *bg)
277 : : {
278 : 0 : return le16_to_cpu(bg->bg_itable_unused_lo) |
279 : 0 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
280 [ # # ]: 0 : (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
281 : : }
282 : :
283 : 0 : void ext4_block_bitmap_set(struct super_block *sb,
284 : : struct ext4_group_desc *bg, ext4_fsblk_t blk)
285 : : {
286 : 0 : bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
287 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 : 0 : bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
289 : 0 : }
290 : :
291 : 0 : void ext4_inode_bitmap_set(struct super_block *sb,
292 : : struct ext4_group_desc *bg, ext4_fsblk_t blk)
293 : : {
294 : 0 : bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
295 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 : 0 : bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
297 : 0 : }
298 : :
299 : 0 : void ext4_inode_table_set(struct super_block *sb,
300 : : struct ext4_group_desc *bg, ext4_fsblk_t blk)
301 : : {
302 : 0 : bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
303 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 : 0 : bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
305 : 0 : }
306 : :
307 : 63322 : void ext4_free_group_clusters_set(struct super_block *sb,
308 : : struct ext4_group_desc *bg, __u32 count)
309 : : {
310 : 63322 : bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
311 [ - + ]: 63322 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 : 0 : bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
313 : 63322 : }
314 : :
315 : 150248 : void ext4_free_inodes_set(struct super_block *sb,
316 : : struct ext4_group_desc *bg, __u32 count)
317 : : {
318 : 150248 : bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
319 [ - + ]: 150248 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
320 : 0 : bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
321 : 150248 : }
322 : :
323 : 47221 : void ext4_used_dirs_set(struct super_block *sb,
324 : : struct ext4_group_desc *bg, __u32 count)
325 : : {
326 : 47221 : bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
327 [ - + ]: 47221 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
328 : 0 : bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
329 : 47221 : }
330 : :
331 : 0 : void ext4_itable_unused_set(struct super_block *sb,
332 : : struct ext4_group_desc *bg, __u32 count)
333 : : {
334 : 0 : bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
335 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
336 : 0 : bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
337 : 0 : }
338 : :
339 : : static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
340 : : {
341 : 207 : time64_t now = ktime_get_real_seconds();
342 : :
343 : 207 : now = clamp_val(now, 0, (1ull << 40) - 1);
344 : :
345 : 207 : *lo = cpu_to_le32(lower_32_bits(now));
346 : 207 : *hi = upper_32_bits(now);
347 : : }
348 : :
349 : : static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
350 : : {
351 : 0 : return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
352 : : }
353 : : #define ext4_update_tstamp(es, tstamp) \
354 : : __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
355 : : #define ext4_get_tstamp(es, tstamp) \
356 : : __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
357 : :
358 : 0 : static void __save_error_info(struct super_block *sb, const char *func,
359 : : unsigned int line)
360 : : {
361 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
362 : :
363 : 0 : EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
364 [ # # ]: 0 : if (bdev_read_only(sb->s_bdev))
365 : 0 : return;
366 : 0 : es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
367 : : ext4_update_tstamp(es, s_last_error_time);
368 : 0 : strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
369 : 0 : es->s_last_error_line = cpu_to_le32(line);
370 [ # # ]: 0 : if (!es->s_first_error_time) {
371 : 0 : es->s_first_error_time = es->s_last_error_time;
372 : 0 : es->s_first_error_time_hi = es->s_last_error_time_hi;
373 : 0 : strncpy(es->s_first_error_func, func,
374 : : sizeof(es->s_first_error_func));
375 : 0 : es->s_first_error_line = cpu_to_le32(line);
376 : 0 : es->s_first_error_ino = es->s_last_error_ino;
377 : 0 : es->s_first_error_block = es->s_last_error_block;
378 : : }
379 : : /*
380 : : * Start the daily error reporting function if it hasn't been
381 : : * started already
382 : : */
383 [ # # ]: 0 : if (!es->s_error_count)
384 : 0 : mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
385 : : le32_add_cpu(&es->s_error_count, 1);
386 : : }
387 : :
388 : 0 : static void save_error_info(struct super_block *sb, const char *func,
389 : : unsigned int line)
390 : : {
391 : 0 : __save_error_info(sb, func, line);
392 [ # # ]: 0 : if (!bdev_read_only(sb->s_bdev))
393 : 0 : ext4_commit_super(sb, 1);
394 : 0 : }
395 : :
396 : : /*
397 : : * The del_gendisk() function uninitializes the disk-specific data
398 : : * structures, including the bdi structure, without telling anyone
399 : : * else. Once this happens, any attempt to call mark_buffer_dirty()
400 : : * (for example, by ext4_commit_super), will cause a kernel OOPS.
401 : : * This is a kludge to prevent these oops until we can put in a proper
402 : : * hook in del_gendisk() to inform the VFS and file system layers.
403 : : */
404 : : static int block_device_ejected(struct super_block *sb)
405 : : {
406 : 207 : struct inode *bd_inode = sb->s_bdev->bd_inode;
407 : 207 : struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
408 : :
409 : 207 : return bdi->dev == NULL;
410 : : }
411 : :
412 : 2521 : static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
413 : : {
414 : 2521 : struct super_block *sb = journal->j_private;
415 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
416 : : int error = is_journal_aborted(journal);
417 : : struct ext4_journal_cb_entry *jce;
418 : :
419 [ - + ]: 2521 : BUG_ON(txn->t_state == T_FINISHED);
420 : :
421 : 2521 : ext4_process_freed_data(sb, txn->t_tid);
422 : :
423 : : spin_lock(&sbi->s_md_lock);
424 [ - + ]: 5042 : while (!list_empty(&txn->t_private_list)) {
425 : 0 : jce = list_entry(txn->t_private_list.next,
426 : : struct ext4_journal_cb_entry, jce_list);
427 : 0 : list_del_init(&jce->jce_list);
428 : : spin_unlock(&sbi->s_md_lock);
429 : 0 : jce->jce_func(sb, jce, error);
430 : : spin_lock(&sbi->s_md_lock);
431 : : }
432 : : spin_unlock(&sbi->s_md_lock);
433 : 2521 : }
434 : :
435 : : static bool system_going_down(void)
436 : : {
437 : : return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
438 : 0 : || system_state == SYSTEM_RESTART;
439 : : }
440 : :
441 : : /* Deal with the reporting of failure conditions on a filesystem such as
442 : : * inconsistencies detected or read IO failures.
443 : : *
444 : : * On ext2, we can store the error state of the filesystem in the
445 : : * superblock. That is not possible on ext4, because we may have other
446 : : * write ordering constraints on the superblock which prevent us from
447 : : * writing it out straight away; and given that the journal is about to
448 : : * be aborted, we can't rely on the current, or future, transactions to
449 : : * write out the superblock safely.
450 : : *
451 : : * We'll just use the jbd2_journal_abort() error code to record an error in
452 : : * the journal instead. On recovery, the journal will complain about
453 : : * that error until we've noted it down and cleared it.
454 : : */
455 : :
456 : 0 : static void ext4_handle_error(struct super_block *sb)
457 : : {
458 [ # # ]: 0 : if (test_opt(sb, WARN_ON_ERROR))
459 [ # # ]: 0 : WARN_ON_ONCE(1);
460 : :
461 [ # # ]: 0 : if (sb_rdonly(sb))
462 : : return;
463 : :
464 [ # # ]: 0 : if (!test_opt(sb, ERRORS_CONT)) {
465 : 0 : journal_t *journal = EXT4_SB(sb)->s_journal;
466 : :
467 : 0 : EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
468 [ # # ]: 0 : if (journal)
469 : 0 : jbd2_journal_abort(journal, -EIO);
470 : : }
471 : : /*
472 : : * We force ERRORS_RO behavior when system is rebooting. Otherwise we
473 : : * could panic during 'reboot -f' as the underlying device got already
474 : : * disabled.
475 : : */
476 [ # # # # ]: 0 : if (test_opt(sb, ERRORS_RO) || system_going_down()) {
477 : 0 : ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
478 : : /*
479 : : * Make sure updated value of ->s_mount_flags will be visible
480 : : * before ->s_flags update
481 : : */
482 : 0 : smp_wmb();
483 : 0 : sb->s_flags |= SB_RDONLY;
484 [ # # ]: 0 : } else if (test_opt(sb, ERRORS_PANIC)) {
485 [ # # # # ]: 0 : if (EXT4_SB(sb)->s_journal &&
486 : 0 : !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
487 : : return;
488 : 0 : panic("EXT4-fs (device %s): panic forced after error\n",
489 : 0 : sb->s_id);
490 : : }
491 : : }
492 : :
493 : : #define ext4_error_ratelimit(sb) \
494 : : ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
495 : : "EXT4-fs error")
496 : :
497 : 0 : void __ext4_error(struct super_block *sb, const char *function,
498 : : unsigned int line, const char *fmt, ...)
499 : : {
500 : : struct va_format vaf;
501 : : va_list args;
502 : :
503 [ # # ]: 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
504 : 0 : return;
505 : :
506 : 0 : trace_ext4_error(sb, function, line);
507 [ # # ]: 0 : if (ext4_error_ratelimit(sb)) {
508 : 0 : va_start(args, fmt);
509 : 0 : vaf.fmt = fmt;
510 : 0 : vaf.va = &args;
511 : 0 : printk(KERN_CRIT
512 : : "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
513 : 0 : sb->s_id, function, line, current->comm, &vaf);
514 : 0 : va_end(args);
515 : : }
516 : 0 : save_error_info(sb, function, line);
517 : 0 : ext4_handle_error(sb);
518 : : }
519 : :
520 : 0 : void __ext4_error_inode(struct inode *inode, const char *function,
521 : : unsigned int line, ext4_fsblk_t block,
522 : : const char *fmt, ...)
523 : : {
524 : : va_list args;
525 : : struct va_format vaf;
526 : 0 : struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
527 : :
528 [ # # ]: 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
529 : 0 : return;
530 : :
531 : 0 : trace_ext4_error(inode->i_sb, function, line);
532 : 0 : es->s_last_error_ino = cpu_to_le32(inode->i_ino);
533 : 0 : es->s_last_error_block = cpu_to_le64(block);
534 [ # # ]: 0 : if (ext4_error_ratelimit(inode->i_sb)) {
535 : 0 : va_start(args, fmt);
536 : 0 : vaf.fmt = fmt;
537 : 0 : vaf.va = &args;
538 [ # # ]: 0 : if (block)
539 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
540 : : "inode #%lu: block %llu: comm %s: %pV\n",
541 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
542 : 0 : block, current->comm, &vaf);
543 : : else
544 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
545 : : "inode #%lu: comm %s: %pV\n",
546 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
547 : 0 : current->comm, &vaf);
548 : 0 : va_end(args);
549 : : }
550 : 0 : save_error_info(inode->i_sb, function, line);
551 : 0 : ext4_handle_error(inode->i_sb);
552 : : }
553 : :
554 : 0 : void __ext4_error_file(struct file *file, const char *function,
555 : : unsigned int line, ext4_fsblk_t block,
556 : : const char *fmt, ...)
557 : : {
558 : : va_list args;
559 : : struct va_format vaf;
560 : : struct ext4_super_block *es;
561 : : struct inode *inode = file_inode(file);
562 : : char pathname[80], *path;
563 : :
564 [ # # ]: 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
565 : 0 : return;
566 : :
567 : 0 : trace_ext4_error(inode->i_sb, function, line);
568 : 0 : es = EXT4_SB(inode->i_sb)->s_es;
569 : 0 : es->s_last_error_ino = cpu_to_le32(inode->i_ino);
570 [ # # ]: 0 : if (ext4_error_ratelimit(inode->i_sb)) {
571 : 0 : path = file_path(file, pathname, sizeof(pathname));
572 [ # # ]: 0 : if (IS_ERR(path))
573 : : path = "(unknown)";
574 : 0 : va_start(args, fmt);
575 : 0 : vaf.fmt = fmt;
576 : 0 : vaf.va = &args;
577 [ # # ]: 0 : if (block)
578 : 0 : printk(KERN_CRIT
579 : : "EXT4-fs error (device %s): %s:%d: inode #%lu: "
580 : : "block %llu: comm %s: path %s: %pV\n",
581 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
582 : 0 : block, current->comm, path, &vaf);
583 : : else
584 : 0 : printk(KERN_CRIT
585 : : "EXT4-fs error (device %s): %s:%d: inode #%lu: "
586 : : "comm %s: path %s: %pV\n",
587 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
588 : 0 : current->comm, path, &vaf);
589 : 0 : va_end(args);
590 : : }
591 : 0 : save_error_info(inode->i_sb, function, line);
592 : 0 : ext4_handle_error(inode->i_sb);
593 : : }
594 : :
595 : 0 : const char *ext4_decode_error(struct super_block *sb, int errno,
596 : : char nbuf[16])
597 : : {
598 : : char *errstr = NULL;
599 : :
600 [ # # # # : 0 : switch (errno) {
# # ]
601 : : case -EFSCORRUPTED:
602 : : errstr = "Corrupt filesystem";
603 : : break;
604 : : case -EFSBADCRC:
605 : : errstr = "Filesystem failed CRC";
606 : 0 : break;
607 : : case -EIO:
608 : : errstr = "IO failure";
609 : 0 : break;
610 : : case -ENOMEM:
611 : : errstr = "Out of memory";
612 : 0 : break;
613 : : case -EROFS:
614 [ # # # # : 0 : if (!sb || (EXT4_SB(sb)->s_journal &&
# # ]
615 : 0 : EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
616 : : errstr = "Journal has aborted";
617 : : else
618 : : errstr = "Readonly filesystem";
619 : : break;
620 : : default:
621 : : /* If the caller passed in an extra buffer for unknown
622 : : * errors, textualise them now. Else we just return
623 : : * NULL. */
624 [ # # ]: 0 : if (nbuf) {
625 : : /* Check for truncated error codes... */
626 [ # # ]: 0 : if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
627 : : errstr = nbuf;
628 : : }
629 : : break;
630 : : }
631 : :
632 : 0 : return errstr;
633 : : }
634 : :
635 : : /* __ext4_std_error decodes expected errors from journaling functions
636 : : * automatically and invokes the appropriate error response. */
637 : :
638 : 0 : void __ext4_std_error(struct super_block *sb, const char *function,
639 : : unsigned int line, int errno)
640 : : {
641 : : char nbuf[16];
642 : : const char *errstr;
643 : :
644 [ # # ]: 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
645 : 0 : return;
646 : :
647 : : /* Special case: if the error is EROFS, and we're not already
648 : : * inside a transaction, then there's really no point in logging
649 : : * an error. */
650 [ # # # # : 0 : if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
# # ]
651 : : return;
652 : :
653 [ # # ]: 0 : if (ext4_error_ratelimit(sb)) {
654 : 0 : errstr = ext4_decode_error(sb, errno, nbuf);
655 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
656 : 0 : sb->s_id, function, line, errstr);
657 : : }
658 : :
659 : 0 : save_error_info(sb, function, line);
660 : 0 : ext4_handle_error(sb);
661 : : }
662 : :
663 : : /*
664 : : * ext4_abort is a much stronger failure handler than ext4_error. The
665 : : * abort function may be used to deal with unrecoverable failures such
666 : : * as journal IO errors or ENOMEM at a critical moment in log management.
667 : : *
668 : : * We unconditionally force the filesystem into an ABORT|READONLY state,
669 : : * unless the error response on the fs has been set to panic in which
670 : : * case we take the easy way out and panic immediately.
671 : : */
672 : :
673 : 0 : void __ext4_abort(struct super_block *sb, const char *function,
674 : : unsigned int line, const char *fmt, ...)
675 : : {
676 : : struct va_format vaf;
677 : : va_list args;
678 : :
679 [ # # ]: 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
680 : 0 : return;
681 : :
682 : 0 : save_error_info(sb, function, line);
683 : 0 : va_start(args, fmt);
684 : 0 : vaf.fmt = fmt;
685 : 0 : vaf.va = &args;
686 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
687 : 0 : sb->s_id, function, line, &vaf);
688 : 0 : va_end(args);
689 : :
690 [ # # ]: 0 : if (sb_rdonly(sb) == 0) {
691 : 0 : ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
692 : 0 : EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
693 : : /*
694 : : * Make sure updated value of ->s_mount_flags will be visible
695 : : * before ->s_flags update
696 : : */
697 : 0 : smp_wmb();
698 : 0 : sb->s_flags |= SB_RDONLY;
699 [ # # ]: 0 : if (EXT4_SB(sb)->s_journal)
700 : 0 : jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
701 : 0 : save_error_info(sb, function, line);
702 : : }
703 [ # # # # ]: 0 : if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
704 [ # # # # ]: 0 : if (EXT4_SB(sb)->s_journal &&
705 : 0 : !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
706 : : return;
707 : 0 : panic("EXT4-fs panic from previous error\n");
708 : : }
709 : : }
710 : :
711 : 414 : void __ext4_msg(struct super_block *sb,
712 : : const char *prefix, const char *fmt, ...)
713 : : {
714 : : struct va_format vaf;
715 : : va_list args;
716 : :
717 [ + - ]: 414 : if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
718 : 0 : return;
719 : :
720 : 414 : va_start(args, fmt);
721 : 414 : vaf.fmt = fmt;
722 : 414 : vaf.va = &args;
723 : 414 : printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
724 : 414 : va_end(args);
725 : : }
726 : :
727 : : #define ext4_warning_ratelimit(sb) \
728 : : ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
729 : : "EXT4-fs warning")
730 : :
731 : 0 : void __ext4_warning(struct super_block *sb, const char *function,
732 : : unsigned int line, const char *fmt, ...)
733 : : {
734 : : struct va_format vaf;
735 : : va_list args;
736 : :
737 [ # # ]: 0 : if (!ext4_warning_ratelimit(sb))
738 : 0 : return;
739 : :
740 : 0 : va_start(args, fmt);
741 : 0 : vaf.fmt = fmt;
742 : 0 : vaf.va = &args;
743 : 0 : printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
744 : 0 : sb->s_id, function, line, &vaf);
745 : 0 : va_end(args);
746 : : }
747 : :
748 : 0 : void __ext4_warning_inode(const struct inode *inode, const char *function,
749 : : unsigned int line, const char *fmt, ...)
750 : : {
751 : : struct va_format vaf;
752 : : va_list args;
753 : :
754 [ # # ]: 0 : if (!ext4_warning_ratelimit(inode->i_sb))
755 : 0 : return;
756 : :
757 : 0 : va_start(args, fmt);
758 : 0 : vaf.fmt = fmt;
759 : 0 : vaf.va = &args;
760 : 0 : printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
761 : 0 : "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
762 : 0 : function, line, inode->i_ino, current->comm, &vaf);
763 : 0 : va_end(args);
764 : : }
765 : :
766 : 0 : void __ext4_grp_locked_error(const char *function, unsigned int line,
767 : : struct super_block *sb, ext4_group_t grp,
768 : : unsigned long ino, ext4_fsblk_t block,
769 : : const char *fmt, ...)
770 : : __releases(bitlock)
771 : : __acquires(bitlock)
772 : : {
773 : : struct va_format vaf;
774 : : va_list args;
775 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
776 : :
777 [ # # ]: 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
778 : : return;
779 : :
780 : 0 : trace_ext4_error(sb, function, line);
781 : 0 : es->s_last_error_ino = cpu_to_le32(ino);
782 : 0 : es->s_last_error_block = cpu_to_le64(block);
783 : 0 : __save_error_info(sb, function, line);
784 : :
785 [ # # ]: 0 : if (ext4_error_ratelimit(sb)) {
786 : 0 : va_start(args, fmt);
787 : 0 : vaf.fmt = fmt;
788 : 0 : vaf.va = &args;
789 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
790 : 0 : sb->s_id, function, line, grp);
791 [ # # ]: 0 : if (ino)
792 : 0 : printk(KERN_CONT "inode %lu: ", ino);
793 [ # # ]: 0 : if (block)
794 : 0 : printk(KERN_CONT "block %llu:",
795 : : (unsigned long long) block);
796 : 0 : printk(KERN_CONT "%pV\n", &vaf);
797 : 0 : va_end(args);
798 : : }
799 : :
800 [ # # ]: 0 : if (test_opt(sb, WARN_ON_ERROR))
801 [ # # ]: 0 : WARN_ON_ONCE(1);
802 : :
803 [ # # ]: 0 : if (test_opt(sb, ERRORS_CONT)) {
804 : 0 : ext4_commit_super(sb, 0);
805 : 0 : return;
806 : : }
807 : :
808 : : ext4_unlock_group(sb, grp);
809 : 0 : ext4_commit_super(sb, 1);
810 : 0 : ext4_handle_error(sb);
811 : : /*
812 : : * We only get here in the ERRORS_RO case; relocking the group
813 : : * may be dangerous, but nothing bad will happen since the
814 : : * filesystem will have already been marked read/only and the
815 : : * journal has been aborted. We return 1 as a hint to callers
816 : : * who might what to use the return value from
817 : : * ext4_grp_locked_error() to distinguish between the
818 : : * ERRORS_CONT and ERRORS_RO case, and perhaps return more
819 : : * aggressively from the ext4 function in question, with a
820 : : * more appropriate error code.
821 : : */
822 : 0 : ext4_lock_group(sb, grp);
823 : 0 : return;
824 : : }
825 : :
826 : 0 : void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
827 : : ext4_group_t group,
828 : : unsigned int flags)
829 : : {
830 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
831 : 0 : struct ext4_group_info *grp = ext4_get_group_info(sb, group);
832 : 0 : struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
833 : : int ret;
834 : :
835 [ # # ]: 0 : if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
836 : : ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
837 : : &grp->bb_state);
838 [ # # ]: 0 : if (!ret)
839 : 0 : percpu_counter_sub(&sbi->s_freeclusters_counter,
840 : 0 : grp->bb_free);
841 : : }
842 : :
843 [ # # ]: 0 : if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
844 : : ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
845 : : &grp->bb_state);
846 [ # # ]: 0 : if (!ret && gdp) {
847 : : int count;
848 : :
849 : 0 : count = ext4_free_inodes_count(sb, gdp);
850 : 0 : percpu_counter_sub(&sbi->s_freeinodes_counter,
851 : : count);
852 : : }
853 : : }
854 : 0 : }
855 : :
856 : 207 : void ext4_update_dynamic_rev(struct super_block *sb)
857 : : {
858 : 207 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
859 : :
860 [ - + ]: 207 : if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
861 : 207 : return;
862 : :
863 : 0 : ext4_warning(sb,
864 : : "updating to rev %d because of new feature flag, "
865 : : "running e2fsck is recommended",
866 : : EXT4_DYNAMIC_REV);
867 : :
868 : 0 : es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
869 : 0 : es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
870 : 0 : es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
871 : : /* leave es->s_feature_*compat flags alone */
872 : : /* es->s_uuid will be set by e2fsck if empty */
873 : :
874 : : /*
875 : : * The rest of the superblock fields should be zero, and if not it
876 : : * means they are likely already in use, so leave them alone. We
877 : : * can leave it up to e2fsck to clean up any inconsistencies there.
878 : : */
879 : : }
880 : :
881 : : /*
882 : : * Open the external journal device
883 : : */
884 : 0 : static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
885 : : {
886 : : struct block_device *bdev;
887 : : char b[BDEVNAME_SIZE];
888 : :
889 : 0 : bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
890 [ # # ]: 0 : if (IS_ERR(bdev))
891 : : goto fail;
892 : : return bdev;
893 : :
894 : : fail:
895 : 0 : ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
896 : : __bdevname(dev, b), PTR_ERR(bdev));
897 : 0 : return NULL;
898 : : }
899 : :
900 : : /*
901 : : * Release the journal device
902 : : */
903 : : static void ext4_blkdev_put(struct block_device *bdev)
904 : : {
905 : 0 : blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
906 : : }
907 : :
908 : : static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
909 : : {
910 : : struct block_device *bdev;
911 : 0 : bdev = sbi->journal_bdev;
912 [ # # # # ]: 0 : if (bdev) {
913 : : ext4_blkdev_put(bdev);
914 : 0 : sbi->journal_bdev = NULL;
915 : : }
916 : : }
917 : :
918 : : static inline struct inode *orphan_list_entry(struct list_head *l)
919 : : {
920 : 0 : return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
921 : : }
922 : :
923 : 0 : static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
924 : : {
925 : : struct list_head *l;
926 : :
927 : 0 : ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
928 : : le32_to_cpu(sbi->s_es->s_last_orphan));
929 : :
930 : 0 : printk(KERN_ERR "sb_info orphan list:\n");
931 [ # # ]: 0 : list_for_each(l, &sbi->s_orphan) {
932 : : struct inode *inode = orphan_list_entry(l);
933 : 0 : printk(KERN_ERR " "
934 : : "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
935 : 0 : inode->i_sb->s_id, inode->i_ino, inode,
936 : 0 : inode->i_mode, inode->i_nlink,
937 : : NEXT_ORPHAN(inode));
938 : : }
939 : 0 : }
940 : :
941 : : #ifdef CONFIG_QUOTA
942 : : static int ext4_quota_off(struct super_block *sb, int type);
943 : :
944 : : static inline void ext4_quota_off_umount(struct super_block *sb)
945 : : {
946 : : int type;
947 : :
948 : : /* Use our quota_off function to clear inode flags etc. */
949 [ # # ]: 0 : for (type = 0; type < EXT4_MAXQUOTAS; type++)
950 : 0 : ext4_quota_off(sb, type);
951 : : }
952 : :
953 : : /*
954 : : * This is a helper function which is used in the mount/remount
955 : : * codepaths (which holds s_umount) to fetch the quota file name.
956 : : */
957 : : static inline char *get_qf_name(struct super_block *sb,
958 : : struct ext4_sb_info *sbi,
959 : : int type)
960 : : {
961 : 0 : return rcu_dereference_protected(sbi->s_qf_names[type],
962 : : lockdep_is_held(&sb->s_umount));
963 : : }
964 : : #else
965 : : static inline void ext4_quota_off_umount(struct super_block *sb)
966 : : {
967 : : }
968 : : #endif
969 : :
970 : 0 : static void ext4_put_super(struct super_block *sb)
971 : : {
972 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
973 : 0 : struct ext4_super_block *es = sbi->s_es;
974 : : struct buffer_head **group_desc;
975 : : struct flex_groups **flex_groups;
976 : : int aborted = 0;
977 : : int i, err;
978 : :
979 : 0 : ext4_unregister_li_request(sb);
980 : : ext4_quota_off_umount(sb);
981 : :
982 : 0 : destroy_workqueue(sbi->rsv_conversion_wq);
983 : :
984 [ # # ]: 0 : if (sbi->s_journal) {
985 : : aborted = is_journal_aborted(sbi->s_journal);
986 : 0 : err = jbd2_journal_destroy(sbi->s_journal);
987 : 0 : sbi->s_journal = NULL;
988 [ # # ]: 0 : if ((err < 0) && !aborted)
989 : 0 : ext4_abort(sb, "Couldn't clean up the journal");
990 : : }
991 : :
992 : 0 : ext4_unregister_sysfs(sb);
993 : 0 : ext4_es_unregister_shrinker(sbi);
994 : 0 : del_timer_sync(&sbi->s_err_report);
995 : 0 : ext4_release_system_zone(sb);
996 : 0 : ext4_mb_release(sb);
997 : 0 : ext4_ext_release(sb);
998 : :
999 [ # # # # ]: 0 : if (!sb_rdonly(sb) && !aborted) {
1000 : : ext4_clear_feature_journal_needs_recovery(sb);
1001 : 0 : es->s_state = cpu_to_le16(sbi->s_mount_state);
1002 : : }
1003 [ # # ]: 0 : if (!sb_rdonly(sb))
1004 : 0 : ext4_commit_super(sb, 1);
1005 : :
1006 : : rcu_read_lock();
1007 : 0 : group_desc = rcu_dereference(sbi->s_group_desc);
1008 [ # # ]: 0 : for (i = 0; i < sbi->s_gdb_count; i++)
1009 : 0 : brelse(group_desc[i]);
1010 : 0 : kvfree(group_desc);
1011 : 0 : flex_groups = rcu_dereference(sbi->s_flex_groups);
1012 [ # # ]: 0 : if (flex_groups) {
1013 [ # # ]: 0 : for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1014 : 0 : kvfree(flex_groups[i]);
1015 : 0 : kvfree(flex_groups);
1016 : : }
1017 : : rcu_read_unlock();
1018 : 0 : percpu_counter_destroy(&sbi->s_freeclusters_counter);
1019 : 0 : percpu_counter_destroy(&sbi->s_freeinodes_counter);
1020 : 0 : percpu_counter_destroy(&sbi->s_dirs_counter);
1021 : 0 : percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1022 : 0 : percpu_free_rwsem(&sbi->s_writepages_rwsem);
1023 : : #ifdef CONFIG_QUOTA
1024 [ # # ]: 0 : for (i = 0; i < EXT4_MAXQUOTAS; i++)
1025 : 0 : kfree(get_qf_name(sb, sbi, i));
1026 : : #endif
1027 : :
1028 : : /* Debugging code just in case the in-memory inode orphan list
1029 : : * isn't empty. The on-disk one can be non-empty if we've
1030 : : * detected an error and taken the fs readonly, but the
1031 : : * in-memory list had better be clean by this point. */
1032 [ # # ]: 0 : if (!list_empty(&sbi->s_orphan))
1033 : 0 : dump_orphan_list(sb, sbi);
1034 [ # # ]: 0 : J_ASSERT(list_empty(&sbi->s_orphan));
1035 : :
1036 : 0 : sync_blockdev(sb->s_bdev);
1037 : 0 : invalidate_bdev(sb->s_bdev);
1038 [ # # # # ]: 0 : if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1039 : : /*
1040 : : * Invalidate the journal device's buffers. We don't want them
1041 : : * floating about in memory - the physical journal device may
1042 : : * hotswapped, and it breaks the `ro-after' testing code.
1043 : : */
1044 : 0 : sync_blockdev(sbi->journal_bdev);
1045 : 0 : invalidate_bdev(sbi->journal_bdev);
1046 : : ext4_blkdev_remove(sbi);
1047 : : }
1048 : :
1049 : 0 : ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1050 : 0 : sbi->s_ea_inode_cache = NULL;
1051 : :
1052 : 0 : ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1053 : 0 : sbi->s_ea_block_cache = NULL;
1054 : :
1055 [ # # ]: 0 : if (sbi->s_mmp_tsk)
1056 : 0 : kthread_stop(sbi->s_mmp_tsk);
1057 : 0 : brelse(sbi->s_sbh);
1058 : 0 : sb->s_fs_info = NULL;
1059 : : /*
1060 : : * Now that we are completely done shutting down the
1061 : : * superblock, we need to actually destroy the kobject.
1062 : : */
1063 : 0 : kobject_put(&sbi->s_kobj);
1064 : 0 : wait_for_completion(&sbi->s_kobj_unregister);
1065 [ # # ]: 0 : if (sbi->s_chksum_driver)
1066 : : crypto_free_shash(sbi->s_chksum_driver);
1067 : 0 : kfree(sbi->s_blockgroup_lock);
1068 : : fs_put_dax(sbi->s_daxdev);
1069 : : #ifdef CONFIG_UNICODE
1070 : : utf8_unload(sbi->s_encoding);
1071 : : #endif
1072 : 0 : kfree(sbi);
1073 : 0 : }
1074 : :
1075 : : static struct kmem_cache *ext4_inode_cachep;
1076 : :
1077 : : /*
1078 : : * Called inside transaction, so use GFP_NOFS
1079 : : */
1080 : 802334 : static struct inode *ext4_alloc_inode(struct super_block *sb)
1081 : : {
1082 : : struct ext4_inode_info *ei;
1083 : :
1084 : 802334 : ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1085 [ + + ]: 802427 : if (!ei)
1086 : : return NULL;
1087 : :
1088 : : inode_set_iversion(&ei->vfs_inode, 1);
1089 : 802406 : spin_lock_init(&ei->i_raw_lock);
1090 : 802406 : INIT_LIST_HEAD(&ei->i_prealloc_list);
1091 : 802406 : spin_lock_init(&ei->i_prealloc_lock);
1092 : 802406 : ext4_es_init_tree(&ei->i_es_tree);
1093 : 802293 : rwlock_init(&ei->i_es_lock);
1094 : 802293 : INIT_LIST_HEAD(&ei->i_es_list);
1095 : 802293 : ei->i_es_all_nr = 0;
1096 : 802293 : ei->i_es_shk_nr = 0;
1097 : 802293 : ei->i_es_shrink_lblk = 0;
1098 : 802293 : ei->i_reserved_data_blocks = 0;
1099 : 802293 : ei->i_da_metadata_calc_len = 0;
1100 : 802293 : ei->i_da_metadata_calc_last_lblock = 0;
1101 : 802293 : spin_lock_init(&(ei->i_block_reservation_lock));
1102 : 802293 : ext4_init_pending_tree(&ei->i_pending_tree);
1103 : : #ifdef CONFIG_QUOTA
1104 : 802075 : ei->i_reserved_quota = 0;
1105 : 802075 : memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1106 : : #endif
1107 : 802075 : ei->jinode = NULL;
1108 : 802075 : INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1109 : 802075 : spin_lock_init(&ei->i_completed_io_lock);
1110 : 802075 : ei->i_sync_tid = 0;
1111 : 802075 : ei->i_datasync_tid = 0;
1112 : : atomic_set(&ei->i_unwritten, 0);
1113 : 1604150 : INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1114 : 802075 : return &ei->vfs_inode;
1115 : : }
1116 : :
1117 : 95543 : static int ext4_drop_inode(struct inode *inode)
1118 : : {
1119 : : int drop = generic_drop_inode(inode);
1120 : :
1121 [ + + ]: 95543 : if (!drop)
1122 : 92251 : drop = fscrypt_drop_inode(inode);
1123 : :
1124 : 95543 : trace_ext4_drop_inode(inode, drop);
1125 : 95543 : return drop;
1126 : : }
1127 : :
1128 : 3292 : static void ext4_free_in_core_inode(struct inode *inode)
1129 : : {
1130 : 3292 : fscrypt_free_inode(inode);
1131 : 3292 : kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1132 : 3292 : }
1133 : :
1134 : 3292 : static void ext4_destroy_inode(struct inode *inode)
1135 : : {
1136 [ - + ]: 6584 : if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1137 : 0 : ext4_msg(inode->i_sb, KERN_ERR,
1138 : : "Inode %lu (%p): orphan list check failed!",
1139 : : inode->i_ino, EXT4_I(inode));
1140 : 0 : print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1141 : : EXT4_I(inode), sizeof(struct ext4_inode_info),
1142 : : true);
1143 : 0 : dump_stack();
1144 : : }
1145 : 3292 : }
1146 : :
1147 : 807611 : static void init_once(void *foo)
1148 : : {
1149 : : struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1150 : :
1151 : 807611 : INIT_LIST_HEAD(&ei->i_orphan);
1152 : 807611 : init_rwsem(&ei->xattr_sem);
1153 : 807611 : init_rwsem(&ei->i_data_sem);
1154 : 807607 : init_rwsem(&ei->i_mmap_sem);
1155 : 807615 : inode_init_once(&ei->vfs_inode);
1156 : 807615 : }
1157 : :
1158 : 207 : static int __init init_inodecache(void)
1159 : : {
1160 : 207 : ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1161 : : sizeof(struct ext4_inode_info), 0,
1162 : : (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1163 : : SLAB_ACCOUNT),
1164 : : offsetof(struct ext4_inode_info, i_data),
1165 : : sizeof_field(struct ext4_inode_info, i_data),
1166 : : init_once);
1167 [ + - ]: 207 : if (ext4_inode_cachep == NULL)
1168 : : return -ENOMEM;
1169 : 207 : return 0;
1170 : : }
1171 : :
1172 : : static void destroy_inodecache(void)
1173 : : {
1174 : : /*
1175 : : * Make sure all delayed rcu free inodes are flushed before we
1176 : : * destroy cache.
1177 : : */
1178 : 0 : rcu_barrier();
1179 : 0 : kmem_cache_destroy(ext4_inode_cachep);
1180 : : }
1181 : :
1182 : 3292 : void ext4_clear_inode(struct inode *inode)
1183 : : {
1184 : 3292 : invalidate_inode_buffers(inode);
1185 : 3291 : clear_inode(inode);
1186 : 3292 : ext4_discard_preallocations(inode);
1187 : 3292 : ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1188 : 3292 : dquot_drop(inode);
1189 [ + + ]: 3292 : if (EXT4_I(inode)->jinode) {
1190 : 1116 : jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1191 : : EXT4_I(inode)->jinode);
1192 : 558 : jbd2_free_inode(EXT4_I(inode)->jinode);
1193 : 558 : EXT4_I(inode)->jinode = NULL;
1194 : : }
1195 : 3292 : fscrypt_put_encryption_info(inode);
1196 : : fsverity_cleanup_inode(inode);
1197 : 3292 : }
1198 : :
1199 : 0 : static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1200 : : u64 ino, u32 generation)
1201 : : {
1202 : : struct inode *inode;
1203 : :
1204 : : /*
1205 : : * Currently we don't know the generation for parent directory, so
1206 : : * a generation of 0 means "accept any"
1207 : : */
1208 : 0 : inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1209 [ # # ]: 0 : if (IS_ERR(inode))
1210 : : return ERR_CAST(inode);
1211 [ # # # # ]: 0 : if (generation && inode->i_generation != generation) {
1212 : 0 : iput(inode);
1213 : 0 : return ERR_PTR(-ESTALE);
1214 : : }
1215 : :
1216 : : return inode;
1217 : : }
1218 : :
1219 : 0 : static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1220 : : int fh_len, int fh_type)
1221 : : {
1222 : 0 : return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1223 : : ext4_nfs_get_inode);
1224 : : }
1225 : :
1226 : 0 : static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1227 : : int fh_len, int fh_type)
1228 : : {
1229 : 0 : return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1230 : : ext4_nfs_get_inode);
1231 : : }
1232 : :
1233 : 0 : static int ext4_nfs_commit_metadata(struct inode *inode)
1234 : : {
1235 : 0 : struct writeback_control wbc = {
1236 : : .sync_mode = WB_SYNC_ALL
1237 : : };
1238 : :
1239 : 0 : trace_ext4_nfs_commit_metadata(inode);
1240 : 0 : return ext4_write_inode(inode, &wbc);
1241 : : }
1242 : :
1243 : : /*
1244 : : * Try to release metadata pages (indirect blocks, directories) which are
1245 : : * mapped via the block device. Since these pages could have journal heads
1246 : : * which would prevent try_to_free_buffers() from freeing them, we must use
1247 : : * jbd2 layer's try_to_free_buffers() function to release them.
1248 : : */
1249 : 0 : static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1250 : : gfp_t wait)
1251 : : {
1252 : 0 : journal_t *journal = EXT4_SB(sb)->s_journal;
1253 : :
1254 [ # # ]: 0 : WARN_ON(PageChecked(page));
1255 [ # # ]: 0 : if (!page_has_buffers(page))
1256 : : return 0;
1257 [ # # ]: 0 : if (journal)
1258 : 0 : return jbd2_journal_try_to_free_buffers(journal, page,
1259 : : wait & ~__GFP_DIRECT_RECLAIM);
1260 : 0 : return try_to_free_buffers(page);
1261 : : }
1262 : :
1263 : : #ifdef CONFIG_FS_ENCRYPTION
1264 : 0 : static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1265 : : {
1266 : 0 : return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1267 : : EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1268 : : }
1269 : :
1270 : 0 : static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1271 : : void *fs_data)
1272 : : {
1273 : : handle_t *handle = fs_data;
1274 : 0 : int res, res2, credits, retries = 0;
1275 : :
1276 : : /*
1277 : : * Encrypting the root directory is not allowed because e2fsck expects
1278 : : * lost+found to exist and be unencrypted, and encrypting the root
1279 : : * directory would imply encrypting the lost+found directory as well as
1280 : : * the filename "lost+found" itself.
1281 : : */
1282 [ # # ]: 0 : if (inode->i_ino == EXT4_ROOT_INO)
1283 : : return -EPERM;
1284 : :
1285 : : if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1286 : : return -EINVAL;
1287 : :
1288 : 0 : res = ext4_convert_inline_data(inode);
1289 [ # # ]: 0 : if (res)
1290 : : return res;
1291 : :
1292 : : /*
1293 : : * If a journal handle was specified, then the encryption context is
1294 : : * being set on a new inode via inheritance and is part of a larger
1295 : : * transaction to create the inode. Otherwise the encryption context is
1296 : : * being set on an existing inode in its own transaction. Only in the
1297 : : * latter case should the "retry on ENOSPC" logic be used.
1298 : : */
1299 : :
1300 [ # # ]: 0 : if (handle) {
1301 : 0 : res = ext4_xattr_set_handle(handle, inode,
1302 : : EXT4_XATTR_INDEX_ENCRYPTION,
1303 : : EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1304 : : ctx, len, 0);
1305 [ # # ]: 0 : if (!res) {
1306 : : ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1307 : : ext4_clear_inode_state(inode,
1308 : : EXT4_STATE_MAY_INLINE_DATA);
1309 : : /*
1310 : : * Update inode->i_flags - S_ENCRYPTED will be enabled,
1311 : : * S_DAX may be disabled
1312 : : */
1313 : 0 : ext4_set_inode_flags(inode);
1314 : : }
1315 : 0 : return res;
1316 : : }
1317 : :
1318 : 0 : res = dquot_initialize(inode);
1319 [ # # ]: 0 : if (res)
1320 : : return res;
1321 : : retry:
1322 : 0 : res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1323 : : &credits);
1324 [ # # ]: 0 : if (res)
1325 : 0 : return res;
1326 : :
1327 : 0 : handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1328 [ # # ]: 0 : if (IS_ERR(handle))
1329 : 0 : return PTR_ERR(handle);
1330 : :
1331 : 0 : res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1332 : : EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1333 : : ctx, len, 0);
1334 [ # # ]: 0 : if (!res) {
1335 : : ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1336 : : /*
1337 : : * Update inode->i_flags - S_ENCRYPTED will be enabled,
1338 : : * S_DAX may be disabled
1339 : : */
1340 : 0 : ext4_set_inode_flags(inode);
1341 : 0 : res = ext4_mark_inode_dirty(handle, inode);
1342 [ # # ]: 0 : if (res)
1343 : 0 : EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1344 : : }
1345 : 0 : res2 = ext4_journal_stop(handle);
1346 : :
1347 [ # # # # ]: 0 : if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1348 : : goto retry;
1349 [ # # ]: 0 : if (!res)
1350 : 0 : res = res2;
1351 : 0 : return res;
1352 : : }
1353 : :
1354 : 0 : static bool ext4_dummy_context(struct inode *inode)
1355 : : {
1356 : 0 : return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1357 : : }
1358 : :
1359 : : static const struct fscrypt_operations ext4_cryptops = {
1360 : : .key_prefix = "ext4:",
1361 : : .get_context = ext4_get_context,
1362 : : .set_context = ext4_set_context,
1363 : : .dummy_context = ext4_dummy_context,
1364 : : .empty_dir = ext4_empty_dir,
1365 : : .max_namelen = EXT4_NAME_LEN,
1366 : : };
1367 : : #endif
1368 : :
1369 : : #ifdef CONFIG_QUOTA
1370 : : static const char * const quotatypes[] = INITQFNAMES;
1371 : : #define QTYPE2NAME(t) (quotatypes[t])
1372 : :
1373 : : static int ext4_write_dquot(struct dquot *dquot);
1374 : : static int ext4_acquire_dquot(struct dquot *dquot);
1375 : : static int ext4_release_dquot(struct dquot *dquot);
1376 : : static int ext4_mark_dquot_dirty(struct dquot *dquot);
1377 : : static int ext4_write_info(struct super_block *sb, int type);
1378 : : static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1379 : : const struct path *path);
1380 : : static int ext4_quota_on_mount(struct super_block *sb, int type);
1381 : : static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1382 : : size_t len, loff_t off);
1383 : : static ssize_t ext4_quota_write(struct super_block *sb, int type,
1384 : : const char *data, size_t len, loff_t off);
1385 : : static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1386 : : unsigned int flags);
1387 : : static int ext4_enable_quotas(struct super_block *sb);
1388 : : static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1389 : :
1390 : 3292 : static struct dquot **ext4_get_dquots(struct inode *inode)
1391 : : {
1392 : 3292 : return EXT4_I(inode)->i_dquot;
1393 : : }
1394 : :
1395 : : static const struct dquot_operations ext4_quota_operations = {
1396 : : .get_reserved_space = ext4_get_reserved_space,
1397 : : .write_dquot = ext4_write_dquot,
1398 : : .acquire_dquot = ext4_acquire_dquot,
1399 : : .release_dquot = ext4_release_dquot,
1400 : : .mark_dirty = ext4_mark_dquot_dirty,
1401 : : .write_info = ext4_write_info,
1402 : : .alloc_dquot = dquot_alloc,
1403 : : .destroy_dquot = dquot_destroy,
1404 : : .get_projid = ext4_get_projid,
1405 : : .get_inode_usage = ext4_get_inode_usage,
1406 : : .get_next_id = ext4_get_next_id,
1407 : : };
1408 : :
1409 : : static const struct quotactl_ops ext4_qctl_operations = {
1410 : : .quota_on = ext4_quota_on,
1411 : : .quota_off = ext4_quota_off,
1412 : : .quota_sync = dquot_quota_sync,
1413 : : .get_state = dquot_get_state,
1414 : : .set_info = dquot_set_dqinfo,
1415 : : .get_dqblk = dquot_get_dqblk,
1416 : : .set_dqblk = dquot_set_dqblk,
1417 : : .get_nextdqblk = dquot_get_next_dqblk,
1418 : : };
1419 : : #endif
1420 : :
1421 : : static const struct super_operations ext4_sops = {
1422 : : .alloc_inode = ext4_alloc_inode,
1423 : : .free_inode = ext4_free_in_core_inode,
1424 : : .destroy_inode = ext4_destroy_inode,
1425 : : .write_inode = ext4_write_inode,
1426 : : .dirty_inode = ext4_dirty_inode,
1427 : : .drop_inode = ext4_drop_inode,
1428 : : .evict_inode = ext4_evict_inode,
1429 : : .put_super = ext4_put_super,
1430 : : .sync_fs = ext4_sync_fs,
1431 : : .freeze_fs = ext4_freeze,
1432 : : .unfreeze_fs = ext4_unfreeze,
1433 : : .statfs = ext4_statfs,
1434 : : .remount_fs = ext4_remount,
1435 : : .show_options = ext4_show_options,
1436 : : #ifdef CONFIG_QUOTA
1437 : : .quota_read = ext4_quota_read,
1438 : : .quota_write = ext4_quota_write,
1439 : : .get_dquots = ext4_get_dquots,
1440 : : #endif
1441 : : .bdev_try_to_free_page = bdev_try_to_free_page,
1442 : : };
1443 : :
1444 : : static const struct export_operations ext4_export_ops = {
1445 : : .fh_to_dentry = ext4_fh_to_dentry,
1446 : : .fh_to_parent = ext4_fh_to_parent,
1447 : : .get_parent = ext4_get_parent,
1448 : : .commit_metadata = ext4_nfs_commit_metadata,
1449 : : };
1450 : :
1451 : : enum {
1452 : : Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1453 : : Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1454 : : Opt_nouid32, Opt_debug, Opt_removed,
1455 : : Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1456 : : Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1457 : : Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1458 : : Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1459 : : Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1460 : : Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1461 : : Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1462 : : Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1463 : : Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1464 : : Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1465 : : Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1466 : : Opt_nowarn_on_error, Opt_mblk_io_submit,
1467 : : Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1468 : : Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1469 : : Opt_inode_readahead_blks, Opt_journal_ioprio,
1470 : : Opt_dioread_nolock, Opt_dioread_lock,
1471 : : Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1472 : : Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1473 : : };
1474 : :
1475 : : static const match_table_t tokens = {
1476 : : {Opt_bsd_df, "bsddf"},
1477 : : {Opt_minix_df, "minixdf"},
1478 : : {Opt_grpid, "grpid"},
1479 : : {Opt_grpid, "bsdgroups"},
1480 : : {Opt_nogrpid, "nogrpid"},
1481 : : {Opt_nogrpid, "sysvgroups"},
1482 : : {Opt_resgid, "resgid=%u"},
1483 : : {Opt_resuid, "resuid=%u"},
1484 : : {Opt_sb, "sb=%u"},
1485 : : {Opt_err_cont, "errors=continue"},
1486 : : {Opt_err_panic, "errors=panic"},
1487 : : {Opt_err_ro, "errors=remount-ro"},
1488 : : {Opt_nouid32, "nouid32"},
1489 : : {Opt_debug, "debug"},
1490 : : {Opt_removed, "oldalloc"},
1491 : : {Opt_removed, "orlov"},
1492 : : {Opt_user_xattr, "user_xattr"},
1493 : : {Opt_nouser_xattr, "nouser_xattr"},
1494 : : {Opt_acl, "acl"},
1495 : : {Opt_noacl, "noacl"},
1496 : : {Opt_noload, "norecovery"},
1497 : : {Opt_noload, "noload"},
1498 : : {Opt_removed, "nobh"},
1499 : : {Opt_removed, "bh"},
1500 : : {Opt_commit, "commit=%u"},
1501 : : {Opt_min_batch_time, "min_batch_time=%u"},
1502 : : {Opt_max_batch_time, "max_batch_time=%u"},
1503 : : {Opt_journal_dev, "journal_dev=%u"},
1504 : : {Opt_journal_path, "journal_path=%s"},
1505 : : {Opt_journal_checksum, "journal_checksum"},
1506 : : {Opt_nojournal_checksum, "nojournal_checksum"},
1507 : : {Opt_journal_async_commit, "journal_async_commit"},
1508 : : {Opt_abort, "abort"},
1509 : : {Opt_data_journal, "data=journal"},
1510 : : {Opt_data_ordered, "data=ordered"},
1511 : : {Opt_data_writeback, "data=writeback"},
1512 : : {Opt_data_err_abort, "data_err=abort"},
1513 : : {Opt_data_err_ignore, "data_err=ignore"},
1514 : : {Opt_offusrjquota, "usrjquota="},
1515 : : {Opt_usrjquota, "usrjquota=%s"},
1516 : : {Opt_offgrpjquota, "grpjquota="},
1517 : : {Opt_grpjquota, "grpjquota=%s"},
1518 : : {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1519 : : {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1520 : : {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1521 : : {Opt_grpquota, "grpquota"},
1522 : : {Opt_noquota, "noquota"},
1523 : : {Opt_quota, "quota"},
1524 : : {Opt_usrquota, "usrquota"},
1525 : : {Opt_prjquota, "prjquota"},
1526 : : {Opt_barrier, "barrier=%u"},
1527 : : {Opt_barrier, "barrier"},
1528 : : {Opt_nobarrier, "nobarrier"},
1529 : : {Opt_i_version, "i_version"},
1530 : : {Opt_dax, "dax"},
1531 : : {Opt_stripe, "stripe=%u"},
1532 : : {Opt_delalloc, "delalloc"},
1533 : : {Opt_warn_on_error, "warn_on_error"},
1534 : : {Opt_nowarn_on_error, "nowarn_on_error"},
1535 : : {Opt_lazytime, "lazytime"},
1536 : : {Opt_nolazytime, "nolazytime"},
1537 : : {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1538 : : {Opt_nodelalloc, "nodelalloc"},
1539 : : {Opt_removed, "mblk_io_submit"},
1540 : : {Opt_removed, "nomblk_io_submit"},
1541 : : {Opt_block_validity, "block_validity"},
1542 : : {Opt_noblock_validity, "noblock_validity"},
1543 : : {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1544 : : {Opt_journal_ioprio, "journal_ioprio=%u"},
1545 : : {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1546 : : {Opt_auto_da_alloc, "auto_da_alloc"},
1547 : : {Opt_noauto_da_alloc, "noauto_da_alloc"},
1548 : : {Opt_dioread_nolock, "dioread_nolock"},
1549 : : {Opt_dioread_lock, "dioread_lock"},
1550 : : {Opt_discard, "discard"},
1551 : : {Opt_nodiscard, "nodiscard"},
1552 : : {Opt_init_itable, "init_itable=%u"},
1553 : : {Opt_init_itable, "init_itable"},
1554 : : {Opt_noinit_itable, "noinit_itable"},
1555 : : {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1556 : : {Opt_test_dummy_encryption, "test_dummy_encryption"},
1557 : : {Opt_nombcache, "nombcache"},
1558 : : {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
1559 : : {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1560 : : {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1561 : : {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1562 : : {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1563 : : {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1564 : : {Opt_err, NULL},
1565 : : };
1566 : :
1567 : 207 : static ext4_fsblk_t get_sb_block(void **data)
1568 : : {
1569 : : ext4_fsblk_t sb_block;
1570 : 207 : char *options = (char *) *data;
1571 : :
1572 [ - + # # ]: 207 : if (!options || strncmp(options, "sb=", 3) != 0)
1573 : : return 1; /* Default location */
1574 : :
1575 : 0 : options += 3;
1576 : : /* TODO: use simple_strtoll with >32bit ext4 */
1577 : 0 : sb_block = simple_strtoul(options, &options, 0);
1578 [ # # ]: 0 : if (*options && *options != ',') {
1579 : 0 : printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1580 : : (char *) *data);
1581 : 0 : return 1;
1582 : : }
1583 [ # # ]: 0 : if (*options == ',')
1584 : 0 : options++;
1585 : 0 : *data = (void *) options;
1586 : :
1587 : 0 : return sb_block;
1588 : : }
1589 : :
1590 : : #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1591 : : static const char deprecated_msg[] =
1592 : : "Mount option \"%s\" will be removed by %s\n"
1593 : : "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1594 : :
1595 : : #ifdef CONFIG_QUOTA
1596 : 0 : static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1597 : : {
1598 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1599 : : char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
1600 : : int ret = -1;
1601 : :
1602 [ # # # # ]: 0 : if (sb_any_quota_loaded(sb) && !old_qname) {
1603 : 0 : ext4_msg(sb, KERN_ERR,
1604 : : "Cannot change journaled "
1605 : : "quota options when quota turned on");
1606 : 0 : return -1;
1607 : : }
1608 [ # # ]: 0 : if (ext4_has_feature_quota(sb)) {
1609 : 0 : ext4_msg(sb, KERN_INFO, "Journaled quota options "
1610 : : "ignored when QUOTA feature is enabled");
1611 : 0 : return 1;
1612 : : }
1613 : 0 : qname = match_strdup(args);
1614 [ # # ]: 0 : if (!qname) {
1615 : 0 : ext4_msg(sb, KERN_ERR,
1616 : : "Not enough memory for storing quotafile name");
1617 : 0 : return -1;
1618 : : }
1619 [ # # ]: 0 : if (old_qname) {
1620 [ # # ]: 0 : if (strcmp(old_qname, qname) == 0)
1621 : : ret = 1;
1622 : : else
1623 : 0 : ext4_msg(sb, KERN_ERR,
1624 : : "%s quota file already specified",
1625 : : QTYPE2NAME(qtype));
1626 : : goto errout;
1627 : : }
1628 [ # # ]: 0 : if (strchr(qname, '/')) {
1629 : 0 : ext4_msg(sb, KERN_ERR,
1630 : : "quotafile must be on filesystem root");
1631 : 0 : goto errout;
1632 : : }
1633 : 0 : rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
1634 : 0 : set_opt(sb, QUOTA);
1635 : 0 : return 1;
1636 : : errout:
1637 : 0 : kfree(qname);
1638 : 0 : return ret;
1639 : : }
1640 : :
1641 : 0 : static int clear_qf_name(struct super_block *sb, int qtype)
1642 : : {
1643 : :
1644 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1645 : : char *old_qname = get_qf_name(sb, sbi, qtype);
1646 : :
1647 [ # # # # ]: 0 : if (sb_any_quota_loaded(sb) && old_qname) {
1648 : 0 : ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1649 : : " when quota turned on");
1650 : 0 : return -1;
1651 : : }
1652 : 0 : rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1653 : 0 : synchronize_rcu();
1654 : 0 : kfree(old_qname);
1655 : 0 : return 1;
1656 : : }
1657 : : #endif
1658 : :
1659 : : #define MOPT_SET 0x0001
1660 : : #define MOPT_CLEAR 0x0002
1661 : : #define MOPT_NOSUPPORT 0x0004
1662 : : #define MOPT_EXPLICIT 0x0008
1663 : : #define MOPT_CLEAR_ERR 0x0010
1664 : : #define MOPT_GTE0 0x0020
1665 : : #ifdef CONFIG_QUOTA
1666 : : #define MOPT_Q 0
1667 : : #define MOPT_QFMT 0x0040
1668 : : #else
1669 : : #define MOPT_Q MOPT_NOSUPPORT
1670 : : #define MOPT_QFMT MOPT_NOSUPPORT
1671 : : #endif
1672 : : #define MOPT_DATAJ 0x0080
1673 : : #define MOPT_NO_EXT2 0x0100
1674 : : #define MOPT_NO_EXT3 0x0200
1675 : : #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1676 : : #define MOPT_STRING 0x0400
1677 : :
1678 : : static const struct mount_opts {
1679 : : int token;
1680 : : int mount_opt;
1681 : : int flags;
1682 : : } ext4_mount_opts[] = {
1683 : : {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1684 : : {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1685 : : {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1686 : : {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1687 : : {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1688 : : {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1689 : : {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1690 : : MOPT_EXT4_ONLY | MOPT_SET},
1691 : : {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1692 : : MOPT_EXT4_ONLY | MOPT_CLEAR},
1693 : : {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1694 : : {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1695 : : {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1696 : : MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1697 : : {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1698 : : MOPT_EXT4_ONLY | MOPT_CLEAR},
1699 : : {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1700 : : {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1701 : : {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1702 : : MOPT_EXT4_ONLY | MOPT_CLEAR},
1703 : : {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1704 : : MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1705 : : {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1706 : : EXT4_MOUNT_JOURNAL_CHECKSUM),
1707 : : MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1708 : : {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1709 : : {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1710 : : {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1711 : : {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1712 : : {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1713 : : MOPT_NO_EXT2},
1714 : : {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1715 : : MOPT_NO_EXT2},
1716 : : {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1717 : : {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1718 : : {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1719 : : {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1720 : : {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1721 : : {Opt_commit, 0, MOPT_GTE0},
1722 : : {Opt_max_batch_time, 0, MOPT_GTE0},
1723 : : {Opt_min_batch_time, 0, MOPT_GTE0},
1724 : : {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1725 : : {Opt_init_itable, 0, MOPT_GTE0},
1726 : : {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1727 : : {Opt_stripe, 0, MOPT_GTE0},
1728 : : {Opt_resuid, 0, MOPT_GTE0},
1729 : : {Opt_resgid, 0, MOPT_GTE0},
1730 : : {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1731 : : {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1732 : : {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1733 : : {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1734 : : {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1735 : : {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1736 : : MOPT_NO_EXT2 | MOPT_DATAJ},
1737 : : {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1738 : : {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1739 : : #ifdef CONFIG_EXT4_FS_POSIX_ACL
1740 : : {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1741 : : {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1742 : : #else
1743 : : {Opt_acl, 0, MOPT_NOSUPPORT},
1744 : : {Opt_noacl, 0, MOPT_NOSUPPORT},
1745 : : #endif
1746 : : {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1747 : : {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1748 : : {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1749 : : {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1750 : : {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1751 : : MOPT_SET | MOPT_Q},
1752 : : {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1753 : : MOPT_SET | MOPT_Q},
1754 : : {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1755 : : MOPT_SET | MOPT_Q},
1756 : : {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1757 : : EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1758 : : MOPT_CLEAR | MOPT_Q},
1759 : : {Opt_usrjquota, 0, MOPT_Q},
1760 : : {Opt_grpjquota, 0, MOPT_Q},
1761 : : {Opt_offusrjquota, 0, MOPT_Q},
1762 : : {Opt_offgrpjquota, 0, MOPT_Q},
1763 : : {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1764 : : {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1765 : : {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1766 : : {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1767 : : {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1768 : : {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1769 : : {Opt_err, 0, 0}
1770 : : };
1771 : :
1772 : : #ifdef CONFIG_UNICODE
1773 : : static const struct ext4_sb_encodings {
1774 : : __u16 magic;
1775 : : char *name;
1776 : : char *version;
1777 : : } ext4_sb_encoding_map[] = {
1778 : : {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1779 : : };
1780 : :
1781 : : static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1782 : : const struct ext4_sb_encodings **encoding,
1783 : : __u16 *flags)
1784 : : {
1785 : : __u16 magic = le16_to_cpu(es->s_encoding);
1786 : : int i;
1787 : :
1788 : : for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1789 : : if (magic == ext4_sb_encoding_map[i].magic)
1790 : : break;
1791 : :
1792 : : if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1793 : : return -EINVAL;
1794 : :
1795 : : *encoding = &ext4_sb_encoding_map[i];
1796 : : *flags = le16_to_cpu(es->s_encoding_flags);
1797 : :
1798 : : return 0;
1799 : : }
1800 : : #endif
1801 : :
1802 : 0 : static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1803 : : substring_t *args, unsigned long *journal_devnum,
1804 : : unsigned int *journal_ioprio, int is_remount)
1805 : : {
1806 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1807 : : const struct mount_opts *m;
1808 : : kuid_t uid;
1809 : : kgid_t gid;
1810 : 0 : int arg = 0;
1811 : :
1812 : : #ifdef CONFIG_QUOTA
1813 [ # # ]: 0 : if (token == Opt_usrjquota)
1814 : 0 : return set_qf_name(sb, USRQUOTA, &args[0]);
1815 [ # # ]: 0 : else if (token == Opt_grpjquota)
1816 : 0 : return set_qf_name(sb, GRPQUOTA, &args[0]);
1817 [ # # ]: 0 : else if (token == Opt_offusrjquota)
1818 : 0 : return clear_qf_name(sb, USRQUOTA);
1819 [ # # ]: 0 : else if (token == Opt_offgrpjquota)
1820 : 0 : return clear_qf_name(sb, GRPQUOTA);
1821 : : #endif
1822 [ # # # # : 0 : switch (token) {
# # # # ]
1823 : : case Opt_noacl:
1824 : : case Opt_nouser_xattr:
1825 : 0 : ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1826 : 0 : break;
1827 : : case Opt_sb:
1828 : : return 1; /* handled by get_sb_block() */
1829 : : case Opt_removed:
1830 : 0 : ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1831 : 0 : return 1;
1832 : : case Opt_abort:
1833 : 0 : sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1834 : 0 : return 1;
1835 : : case Opt_i_version:
1836 : 0 : sb->s_flags |= SB_I_VERSION;
1837 : 0 : return 1;
1838 : : case Opt_lazytime:
1839 : 0 : sb->s_flags |= SB_LAZYTIME;
1840 : 0 : return 1;
1841 : : case Opt_nolazytime:
1842 : 0 : sb->s_flags &= ~SB_LAZYTIME;
1843 : 0 : return 1;
1844 : : }
1845 : :
1846 [ # # ]: 0 : for (m = ext4_mount_opts; m->token != Opt_err; m++)
1847 [ # # ]: 0 : if (token == m->token)
1848 : : break;
1849 : :
1850 [ # # ]: 0 : if (m->token == Opt_err) {
1851 : 0 : ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1852 : : "or missing value", opt);
1853 : 0 : return -1;
1854 : : }
1855 : :
1856 [ # # # # ]: 0 : if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1857 : 0 : ext4_msg(sb, KERN_ERR,
1858 : : "Mount option \"%s\" incompatible with ext2", opt);
1859 : 0 : return -1;
1860 : : }
1861 [ # # # # ]: 0 : if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1862 : 0 : ext4_msg(sb, KERN_ERR,
1863 : : "Mount option \"%s\" incompatible with ext3", opt);
1864 : 0 : return -1;
1865 : : }
1866 : :
1867 [ # # # # : 0 : if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
# # ]
1868 : : return -1;
1869 [ # # # # : 0 : if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
# # ]
1870 : : return -1;
1871 [ # # ]: 0 : if (m->flags & MOPT_EXPLICIT) {
1872 [ # # ]: 0 : if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1873 : 0 : set_opt2(sb, EXPLICIT_DELALLOC);
1874 [ # # ]: 0 : } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1875 : 0 : set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1876 : : } else
1877 : : return -1;
1878 : : }
1879 [ # # ]: 0 : if (m->flags & MOPT_CLEAR_ERR)
1880 : 0 : clear_opt(sb, ERRORS_MASK);
1881 [ # # # # ]: 0 : if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1882 : 0 : ext4_msg(sb, KERN_ERR, "Cannot change quota "
1883 : : "options when quota turned on");
1884 : 0 : return -1;
1885 : : }
1886 : :
1887 [ # # ]: 0 : if (m->flags & MOPT_NOSUPPORT) {
1888 : 0 : ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1889 [ # # ]: 0 : } else if (token == Opt_commit) {
1890 [ # # ]: 0 : if (arg == 0)
1891 : 0 : arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1892 [ # # ]: 0 : else if (arg > INT_MAX / HZ) {
1893 : 0 : ext4_msg(sb, KERN_ERR,
1894 : : "Invalid commit interval %d, "
1895 : : "must be smaller than %d",
1896 : : arg, INT_MAX / HZ);
1897 : 0 : return -1;
1898 : : }
1899 : 0 : sbi->s_commit_interval = HZ * arg;
1900 [ # # ]: 0 : } else if (token == Opt_debug_want_extra_isize) {
1901 [ # # # # ]: 0 : if ((arg & 1) ||
1902 [ # # ]: 0 : (arg < 4) ||
1903 : 0 : (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
1904 : 0 : ext4_msg(sb, KERN_ERR,
1905 : : "Invalid want_extra_isize %d", arg);
1906 : 0 : return -1;
1907 : : }
1908 : 0 : sbi->s_want_extra_isize = arg;
1909 [ # # ]: 0 : } else if (token == Opt_max_batch_time) {
1910 : 0 : sbi->s_max_batch_time = arg;
1911 [ # # ]: 0 : } else if (token == Opt_min_batch_time) {
1912 : 0 : sbi->s_min_batch_time = arg;
1913 [ # # ]: 0 : } else if (token == Opt_inode_readahead_blks) {
1914 [ # # # # : 0 : if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
# # ]
1915 : 0 : ext4_msg(sb, KERN_ERR,
1916 : : "EXT4-fs: inode_readahead_blks must be "
1917 : : "0 or a power of 2 smaller than 2^31");
1918 : 0 : return -1;
1919 : : }
1920 : 0 : sbi->s_inode_readahead_blks = arg;
1921 [ # # ]: 0 : } else if (token == Opt_init_itable) {
1922 : 0 : set_opt(sb, INIT_INODE_TABLE);
1923 [ # # ]: 0 : if (!args->from)
1924 : 0 : arg = EXT4_DEF_LI_WAIT_MULT;
1925 : 0 : sbi->s_li_wait_mult = arg;
1926 [ # # ]: 0 : } else if (token == Opt_max_dir_size_kb) {
1927 : 0 : sbi->s_max_dir_size_kb = arg;
1928 [ # # ]: 0 : } else if (token == Opt_stripe) {
1929 : 0 : sbi->s_stripe = arg;
1930 [ # # ]: 0 : } else if (token == Opt_resuid) {
1931 : 0 : uid = make_kuid(current_user_ns(), arg);
1932 [ # # ]: 0 : if (!uid_valid(uid)) {
1933 : 0 : ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1934 : 0 : return -1;
1935 : : }
1936 : 0 : sbi->s_resuid = uid;
1937 [ # # ]: 0 : } else if (token == Opt_resgid) {
1938 : 0 : gid = make_kgid(current_user_ns(), arg);
1939 [ # # ]: 0 : if (!gid_valid(gid)) {
1940 : 0 : ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1941 : 0 : return -1;
1942 : : }
1943 : 0 : sbi->s_resgid = gid;
1944 [ # # ]: 0 : } else if (token == Opt_journal_dev) {
1945 [ # # ]: 0 : if (is_remount) {
1946 : 0 : ext4_msg(sb, KERN_ERR,
1947 : : "Cannot specify journal on remount");
1948 : 0 : return -1;
1949 : : }
1950 : 0 : *journal_devnum = arg;
1951 [ # # ]: 0 : } else if (token == Opt_journal_path) {
1952 : : char *journal_path;
1953 : : struct inode *journal_inode;
1954 : : struct path path;
1955 : : int error;
1956 : :
1957 [ # # ]: 0 : if (is_remount) {
1958 : 0 : ext4_msg(sb, KERN_ERR,
1959 : : "Cannot specify journal on remount");
1960 : 0 : return -1;
1961 : : }
1962 : 0 : journal_path = match_strdup(&args[0]);
1963 [ # # ]: 0 : if (!journal_path) {
1964 : 0 : ext4_msg(sb, KERN_ERR, "error: could not dup "
1965 : : "journal device string");
1966 : 0 : return -1;
1967 : : }
1968 : :
1969 : 0 : error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1970 [ # # ]: 0 : if (error) {
1971 : 0 : ext4_msg(sb, KERN_ERR, "error: could not find "
1972 : : "journal device path: error %d", error);
1973 : 0 : kfree(journal_path);
1974 : 0 : return -1;
1975 : : }
1976 : :
1977 : 0 : journal_inode = d_inode(path.dentry);
1978 [ # # ]: 0 : if (!S_ISBLK(journal_inode->i_mode)) {
1979 : 0 : ext4_msg(sb, KERN_ERR, "error: journal path %s "
1980 : : "is not a block device", journal_path);
1981 : 0 : path_put(&path);
1982 : 0 : kfree(journal_path);
1983 : 0 : return -1;
1984 : : }
1985 : :
1986 : 0 : *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1987 : 0 : path_put(&path);
1988 : 0 : kfree(journal_path);
1989 [ # # ]: 0 : } else if (token == Opt_journal_ioprio) {
1990 [ # # ]: 0 : if (arg > 7) {
1991 : 0 : ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1992 : : " (must be 0-7)");
1993 : 0 : return -1;
1994 : : }
1995 : 0 : *journal_ioprio =
1996 : 0 : IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1997 [ # # ]: 0 : } else if (token == Opt_test_dummy_encryption) {
1998 : : #ifdef CONFIG_FS_ENCRYPTION
1999 : 0 : sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
2000 : 0 : ext4_msg(sb, KERN_WARNING,
2001 : : "Test dummy encryption mode enabled");
2002 : : #else
2003 : : ext4_msg(sb, KERN_WARNING,
2004 : : "Test dummy encryption mount option ignored");
2005 : : #endif
2006 [ # # ]: 0 : } else if (m->flags & MOPT_DATAJ) {
2007 [ # # ]: 0 : if (is_remount) {
2008 [ # # ]: 0 : if (!sbi->s_journal)
2009 : 0 : ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2010 [ # # ]: 0 : else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
2011 : 0 : ext4_msg(sb, KERN_ERR,
2012 : : "Cannot change data mode on remount");
2013 : 0 : return -1;
2014 : : }
2015 : : } else {
2016 : 0 : clear_opt(sb, DATA_FLAGS);
2017 : 0 : sbi->s_mount_opt |= m->mount_opt;
2018 : : }
2019 : : #ifdef CONFIG_QUOTA
2020 [ # # ]: 0 : } else if (m->flags & MOPT_QFMT) {
2021 [ # # # # ]: 0 : if (sb_any_quota_loaded(sb) &&
2022 : 0 : sbi->s_jquota_fmt != m->mount_opt) {
2023 : 0 : ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2024 : : "quota options when quota turned on");
2025 : 0 : return -1;
2026 : : }
2027 [ # # ]: 0 : if (ext4_has_feature_quota(sb)) {
2028 : 0 : ext4_msg(sb, KERN_INFO,
2029 : : "Quota format mount options ignored "
2030 : : "when QUOTA feature is enabled");
2031 : 0 : return 1;
2032 : : }
2033 : 0 : sbi->s_jquota_fmt = m->mount_opt;
2034 : : #endif
2035 [ # # ]: 0 : } else if (token == Opt_dax) {
2036 : : #ifdef CONFIG_FS_DAX
2037 : : if (is_remount && test_opt(sb, DAX)) {
2038 : : ext4_msg(sb, KERN_ERR, "can't mount with "
2039 : : "both data=journal and dax");
2040 : : return -1;
2041 : : }
2042 : : if (is_remount && !(sbi->s_mount_opt & EXT4_MOUNT_DAX)) {
2043 : : ext4_msg(sb, KERN_ERR, "can't change "
2044 : : "dax mount option while remounting");
2045 : : return -1;
2046 : : }
2047 : : ext4_msg(sb, KERN_WARNING,
2048 : : "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2049 : : sbi->s_mount_opt |= m->mount_opt;
2050 : : #else
2051 : 0 : ext4_msg(sb, KERN_INFO, "dax option not supported");
2052 : 0 : return -1;
2053 : : #endif
2054 [ # # ]: 0 : } else if (token == Opt_data_err_abort) {
2055 : 0 : sbi->s_mount_opt |= m->mount_opt;
2056 [ # # ]: 0 : } else if (token == Opt_data_err_ignore) {
2057 : 0 : sbi->s_mount_opt &= ~m->mount_opt;
2058 : : } else {
2059 [ # # ]: 0 : if (!args->from)
2060 : 0 : arg = 1;
2061 [ # # ]: 0 : if (m->flags & MOPT_CLEAR)
2062 : 0 : arg = !arg;
2063 [ # # ]: 0 : else if (unlikely(!(m->flags & MOPT_SET))) {
2064 : 0 : ext4_msg(sb, KERN_WARNING,
2065 : : "buggy handling of option %s", opt);
2066 : 0 : WARN_ON(1);
2067 : 0 : return -1;
2068 : : }
2069 [ # # ]: 0 : if (arg != 0)
2070 : 0 : sbi->s_mount_opt |= m->mount_opt;
2071 : : else
2072 : 0 : sbi->s_mount_opt &= ~m->mount_opt;
2073 : : }
2074 : : return 1;
2075 : : }
2076 : :
2077 : 414 : static int parse_options(char *options, struct super_block *sb,
2078 : : unsigned long *journal_devnum,
2079 : : unsigned int *journal_ioprio,
2080 : : int is_remount)
2081 : : {
2082 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2083 : : char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
2084 : : substring_t args[MAX_OPT_ARGS];
2085 : : int token;
2086 : :
2087 [ - + ]: 414 : if (!options)
2088 : : return 1;
2089 : :
2090 [ # # ]: 0 : while ((p = strsep(&options, ",")) != NULL) {
2091 [ # # ]: 0 : if (!*p)
2092 : 0 : continue;
2093 : : /*
2094 : : * Initialize args struct so we know whether arg was
2095 : : * found; some options take optional arguments.
2096 : : */
2097 : 0 : args[0].to = args[0].from = NULL;
2098 : 0 : token = match_token(p, tokens, args);
2099 [ # # ]: 0 : if (handle_mount_opt(sb, p, token, args, journal_devnum,
2100 : : journal_ioprio, is_remount) < 0)
2101 : : return 0;
2102 : : }
2103 : : #ifdef CONFIG_QUOTA
2104 : : /*
2105 : : * We do the test below only for project quotas. 'usrquota' and
2106 : : * 'grpquota' mount options are allowed even without quota feature
2107 : : * to support legacy quotas in quota files.
2108 : : */
2109 [ # # # # ]: 0 : if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2110 : 0 : ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2111 : : "Cannot enable project quota enforcement.");
2112 : 0 : return 0;
2113 : : }
2114 : : usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2115 : : grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2116 [ # # ]: 0 : if (usr_qf_name || grp_qf_name) {
2117 [ # # # # ]: 0 : if (test_opt(sb, USRQUOTA) && usr_qf_name)
2118 : 0 : clear_opt(sb, USRQUOTA);
2119 : :
2120 [ # # # # ]: 0 : if (test_opt(sb, GRPQUOTA) && grp_qf_name)
2121 : 0 : clear_opt(sb, GRPQUOTA);
2122 : :
2123 [ # # # # ]: 0 : if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
2124 : 0 : ext4_msg(sb, KERN_ERR, "old and new quota "
2125 : : "format mixing");
2126 : 0 : return 0;
2127 : : }
2128 : :
2129 [ # # ]: 0 : if (!sbi->s_jquota_fmt) {
2130 : 0 : ext4_msg(sb, KERN_ERR, "journaled quota format "
2131 : : "not specified");
2132 : 0 : return 0;
2133 : : }
2134 : : }
2135 : : #endif
2136 [ # # ]: 0 : if (test_opt(sb, DIOREAD_NOLOCK)) {
2137 : 0 : int blocksize =
2138 : 0 : BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2139 : :
2140 [ # # ]: 0 : if (blocksize < PAGE_SIZE) {
2141 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
2142 : : "dioread_nolock if block size != PAGE_SIZE");
2143 : 0 : return 0;
2144 : : }
2145 : : }
2146 : : return 1;
2147 : : }
2148 : :
2149 : 57069 : static inline void ext4_show_quota_options(struct seq_file *seq,
2150 : : struct super_block *sb)
2151 : : {
2152 : : #if defined(CONFIG_QUOTA)
2153 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2154 : : char *usr_qf_name, *grp_qf_name;
2155 : :
2156 [ - + ]: 57069 : if (sbi->s_jquota_fmt) {
2157 : : char *fmtname = "";
2158 : :
2159 [ # # ]: 0 : switch (sbi->s_jquota_fmt) {
2160 : : case QFMT_VFS_OLD:
2161 : : fmtname = "vfsold";
2162 : : break;
2163 : : case QFMT_VFS_V0:
2164 : : fmtname = "vfsv0";
2165 : : break;
2166 : : case QFMT_VFS_V1:
2167 : : fmtname = "vfsv1";
2168 : : break;
2169 : : }
2170 : 0 : seq_printf(seq, ",jqfmt=%s", fmtname);
2171 : : }
2172 : :
2173 : : rcu_read_lock();
2174 : : usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2175 : : grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2176 [ - + ]: 57217 : if (usr_qf_name)
2177 : 0 : seq_show_option(seq, "usrjquota", usr_qf_name);
2178 [ - + ]: 57227 : if (grp_qf_name)
2179 : 0 : seq_show_option(seq, "grpjquota", grp_qf_name);
2180 : : rcu_read_unlock();
2181 : : #endif
2182 : 57126 : }
2183 : :
2184 : 0 : static const char *token2str(int token)
2185 : : {
2186 : : const struct match_token *t;
2187 : :
2188 [ # # ]: 0 : for (t = tokens; t->token != Opt_err; t++)
2189 [ # # # # ]: 0 : if (t->token == token && !strchr(t->pattern, '='))
2190 : : break;
2191 : 0 : return t->pattern;
2192 : : }
2193 : :
2194 : : /*
2195 : : * Show an option if
2196 : : * - it's set to a non-default value OR
2197 : : * - if the per-sb default is different from the global default
2198 : : */
2199 : 57116 : static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2200 : : int nodefs)
2201 : : {
2202 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2203 : 57116 : struct ext4_super_block *es = sbi->s_es;
2204 : 57116 : int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2205 : : const struct mount_opts *m;
2206 [ + + ]: 57116 : char sep = nodefs ? '\n' : ',';
2207 : :
2208 : : #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2209 : : #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2210 : :
2211 [ - + ]: 57116 : if (sbi->s_sb_block != 1)
2212 : 0 : SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2213 : :
2214 [ + + ]: 3714355 : for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2215 : 3714022 : int want_set = m->flags & MOPT_SET;
2216 [ + + + + ]: 5944706 : if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2217 : 2230684 : (m->flags & MOPT_CLEAR_ERR))
2218 : 1657941 : continue;
2219 [ + + + + ]: 2056081 : if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2220 : 2059356 : continue; /* skip if same as the default */
2221 [ - - # # ]: 0 : if ((want_set &&
2222 [ # # - - ]: 0 : (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2223 [ # # ]: 0 : (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2224 : 0 : continue; /* select Opt_noFoo vs Opt_Foo */
2225 : 0 : SEQ_OPTS_PRINT("%s", token2str(m->token));
2226 : : }
2227 : :
2228 [ + + + + : 114313 : if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
+ + ]
2229 : 57081 : le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2230 : 132 : SEQ_OPTS_PRINT("resuid=%u",
2231 : : from_kuid_munged(&init_user_ns, sbi->s_resuid));
2232 [ + - + + : 114118 : if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
+ + ]
2233 : 57063 : le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2234 : 40 : SEQ_OPTS_PRINT("resgid=%u",
2235 : : from_kgid_munged(&init_user_ns, sbi->s_resgid));
2236 [ + + ]: 57108 : def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2237 [ - + # # ]: 57108 : if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2238 : 0 : SEQ_OPTS_PUTS("errors=remount-ro");
2239 [ + + - + ]: 57108 : if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2240 : 0 : SEQ_OPTS_PUTS("errors=continue");
2241 [ - + # # ]: 57108 : if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2242 : 0 : SEQ_OPTS_PUTS("errors=panic");
2243 [ + - + + ]: 57108 : if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2244 : 44 : SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2245 [ + - + + ]: 57110 : if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2246 : 57 : SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2247 [ + - + + ]: 57066 : if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2248 : 1 : SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2249 [ - + ]: 57223 : if (sb->s_flags & SB_I_VERSION)
2250 : 0 : SEQ_OPTS_PUTS("i_version");
2251 [ + - + + ]: 57223 : if (nodefs || sbi->s_stripe)
2252 : 2 : SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2253 [ + + - + ]: 114279 : if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2254 : 57050 : (sbi->s_mount_opt ^ def_mount_opt)) {
2255 [ # # ]: 0 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2256 : 0 : SEQ_OPTS_PUTS("data=journal");
2257 [ # # ]: 0 : else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2258 : 0 : SEQ_OPTS_PUTS("data=ordered");
2259 [ # # ]: 0 : else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2260 : 0 : SEQ_OPTS_PUTS("data=writeback");
2261 : : }
2262 [ + - + + ]: 114458 : if (nodefs ||
2263 : 57229 : sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2264 : 30 : SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2265 : : sbi->s_inode_readahead_blks);
2266 : :
2267 [ + + + + : 114237 : if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
- + ]
2268 : 57031 : (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2269 : 11 : SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2270 [ + - - + ]: 57196 : if (nodefs || sbi->s_max_dir_size_kb)
2271 : 0 : SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2272 [ - + ]: 57239 : if (test_opt(sb, DATA_ERR_ABORT))
2273 : 0 : SEQ_OPTS_PUTS("data_err=abort");
2274 [ - + ]: 57239 : if (DUMMY_ENCRYPTION_ENABLED(sbi))
2275 : 0 : SEQ_OPTS_PUTS("test_dummy_encryption");
2276 : :
2277 : 57239 : ext4_show_quota_options(seq, sb);
2278 : 57192 : return 0;
2279 : : }
2280 : :
2281 : 57239 : static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2282 : : {
2283 : 57239 : return _ext4_show_options(seq, root->d_sb, 0);
2284 : : }
2285 : :
2286 : 0 : int ext4_seq_options_show(struct seq_file *seq, void *offset)
2287 : : {
2288 : 0 : struct super_block *sb = seq->private;
2289 : : int rc;
2290 : :
2291 [ # # ]: 0 : seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2292 : 0 : rc = _ext4_show_options(seq, sb, 1);
2293 : 0 : seq_puts(seq, "\n");
2294 : 0 : return rc;
2295 : : }
2296 : :
2297 : 414 : static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2298 : : int read_only)
2299 : : {
2300 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2301 : : int err = 0;
2302 : :
2303 [ - + ]: 414 : if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2304 : 0 : ext4_msg(sb, KERN_ERR, "revision level too high, "
2305 : : "forcing read-only mode");
2306 : : err = -EROFS;
2307 : 0 : goto done;
2308 : : }
2309 [ + + ]: 414 : if (read_only)
2310 : : goto done;
2311 [ - + ]: 207 : if (!(sbi->s_mount_state & EXT4_VALID_FS))
2312 : 0 : ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2313 : : "running e2fsck is recommended");
2314 [ - + ]: 207 : else if (sbi->s_mount_state & EXT4_ERROR_FS)
2315 : 0 : ext4_msg(sb, KERN_WARNING,
2316 : : "warning: mounting fs with errors, "
2317 : : "running e2fsck is recommended");
2318 [ - + # # ]: 207 : else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2319 : 0 : le16_to_cpu(es->s_mnt_count) >=
2320 : : (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2321 : 0 : ext4_msg(sb, KERN_WARNING,
2322 : : "warning: maximal mount count reached, "
2323 : : "running e2fsck is recommended");
2324 [ - + # # ]: 207 : else if (le32_to_cpu(es->s_checkinterval) &&
2325 : 0 : (ext4_get_tstamp(es, s_lastcheck) +
2326 : 0 : le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
2327 : 0 : ext4_msg(sb, KERN_WARNING,
2328 : : "warning: checktime reached, "
2329 : : "running e2fsck is recommended");
2330 [ - + ]: 207 : if (!sbi->s_journal)
2331 : 0 : es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2332 [ - + ]: 207 : if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2333 : 0 : es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2334 : : le16_add_cpu(&es->s_mnt_count, 1);
2335 : : ext4_update_tstamp(es, s_mtime);
2336 [ + - ]: 207 : if (sbi->s_journal)
2337 : : ext4_set_feature_journal_needs_recovery(sb);
2338 : :
2339 : 207 : err = ext4_commit_super(sb, 1);
2340 : : done:
2341 [ - + ]: 414 : if (test_opt(sb, DEBUG))
2342 : 0 : printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2343 : : "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2344 : : sb->s_blocksize,
2345 : : sbi->s_groups_count,
2346 : : EXT4_BLOCKS_PER_GROUP(sb),
2347 : : EXT4_INODES_PER_GROUP(sb),
2348 : : sbi->s_mount_opt, sbi->s_mount_opt2);
2349 : :
2350 : : cleancache_init_fs(sb);
2351 : 414 : return err;
2352 : : }
2353 : :
2354 : 207 : int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2355 : : {
2356 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2357 : : struct flex_groups **old_groups, **new_groups;
2358 : : int size, i, j;
2359 : :
2360 [ + - ]: 207 : if (!sbi->s_log_groups_per_flex)
2361 : : return 0;
2362 : :
2363 : 414 : size = ext4_flex_group(sbi, ngroup - 1) + 1;
2364 [ + - ]: 207 : if (size <= sbi->s_flex_groups_allocated)
2365 : : return 0;
2366 : :
2367 [ - + # # : 207 : new_groups = kvzalloc(roundup_pow_of_two(size *
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
2368 : : sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
2369 [ - + ]: 207 : if (!new_groups) {
2370 : 0 : ext4_msg(sb, KERN_ERR,
2371 : : "not enough memory for %d flex group pointers", size);
2372 : 0 : return -ENOMEM;
2373 : : }
2374 [ + + ]: 1035 : for (i = sbi->s_flex_groups_allocated; i < size; i++) {
2375 : 1656 : new_groups[i] = kvzalloc(roundup_pow_of_two(
2376 : : sizeof(struct flex_groups)),
2377 : : GFP_KERNEL);
2378 [ - + ]: 828 : if (!new_groups[i]) {
2379 [ # # ]: 0 : for (j = sbi->s_flex_groups_allocated; j < i; j++)
2380 : 0 : kvfree(new_groups[j]);
2381 : 0 : kvfree(new_groups);
2382 : 0 : ext4_msg(sb, KERN_ERR,
2383 : : "not enough memory for %d flex groups", size);
2384 : 0 : return -ENOMEM;
2385 : : }
2386 : : }
2387 : : rcu_read_lock();
2388 : 207 : old_groups = rcu_dereference(sbi->s_flex_groups);
2389 [ - + ]: 207 : if (old_groups)
2390 : 0 : memcpy(new_groups, old_groups,
2391 : 0 : (sbi->s_flex_groups_allocated *
2392 : : sizeof(struct flex_groups *)));
2393 : : rcu_read_unlock();
2394 : 207 : rcu_assign_pointer(sbi->s_flex_groups, new_groups);
2395 : 207 : sbi->s_flex_groups_allocated = size;
2396 [ - + ]: 207 : if (old_groups)
2397 : 0 : ext4_kvfree_array_rcu(old_groups);
2398 : : return 0;
2399 : : }
2400 : :
2401 : 207 : static int ext4_fill_flex_info(struct super_block *sb)
2402 : : {
2403 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2404 : : struct ext4_group_desc *gdp = NULL;
2405 : : struct flex_groups *fg;
2406 : : ext4_group_t flex_group;
2407 : : int i, err;
2408 : :
2409 : 207 : sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2410 [ - + ]: 207 : if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2411 : 0 : sbi->s_log_groups_per_flex = 0;
2412 : 0 : return 1;
2413 : : }
2414 : :
2415 : 207 : err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2416 [ + - ]: 207 : if (err)
2417 : : goto failed;
2418 : :
2419 [ + + ]: 10971 : for (i = 0; i < sbi->s_groups_count; i++) {
2420 : 10971 : gdp = ext4_get_group_desc(sb, i, NULL);
2421 : :
2422 : : flex_group = ext4_flex_group(sbi, i);
2423 : 10971 : fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
2424 : 10971 : atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
2425 : 10971 : atomic64_add(ext4_free_group_clusters(sb, gdp),
2426 : : &fg->free_clusters);
2427 : 10971 : atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
2428 : : }
2429 : :
2430 : : return 1;
2431 : : failed:
2432 : : return 0;
2433 : : }
2434 : :
2435 : 0 : static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2436 : : struct ext4_group_desc *gdp)
2437 : : {
2438 : : int offset = offsetof(struct ext4_group_desc, bg_checksum);
2439 : : __u16 crc = 0;
2440 : 0 : __le32 le_group = cpu_to_le32(block_group);
2441 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2442 : :
2443 [ # # ]: 0 : if (ext4_has_metadata_csum(sbi->s_sb)) {
2444 : : /* Use new metadata_csum algorithm */
2445 : : __u32 csum32;
2446 : 0 : __u16 dummy_csum = 0;
2447 : :
2448 : 0 : csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2449 : : sizeof(le_group));
2450 : 0 : csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2451 : 0 : csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2452 : : sizeof(dummy_csum));
2453 : : offset += sizeof(dummy_csum);
2454 [ # # ]: 0 : if (offset < sbi->s_desc_size)
2455 : 0 : csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2456 : 0 : sbi->s_desc_size - offset);
2457 : :
2458 : 0 : crc = csum32 & 0xFFFF;
2459 : : goto out;
2460 : : }
2461 : :
2462 : : /* old crc16 code */
2463 [ # # ]: 0 : if (!ext4_has_feature_gdt_csum(sb))
2464 : : return 0;
2465 : :
2466 : 0 : crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2467 : 0 : crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2468 : 0 : crc = crc16(crc, (__u8 *)gdp, offset);
2469 : : offset += sizeof(gdp->bg_checksum); /* skip checksum */
2470 : : /* for checksum of struct ext4_group_desc do the rest...*/
2471 [ # # # # ]: 0 : if (ext4_has_feature_64bit(sb) &&
2472 : 0 : offset < le16_to_cpu(sbi->s_es->s_desc_size))
2473 : 0 : crc = crc16(crc, (__u8 *)gdp + offset,
2474 : 0 : le16_to_cpu(sbi->s_es->s_desc_size) -
2475 : : offset);
2476 : :
2477 : : out:
2478 : 0 : return cpu_to_le16(crc);
2479 : : }
2480 : :
2481 : 21942 : int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2482 : : struct ext4_group_desc *gdp)
2483 : : {
2484 [ - + # # ]: 21942 : if (ext4_has_group_desc_csum(sb) &&
2485 : 0 : (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2486 : : return 0;
2487 : :
2488 : : return 1;
2489 : : }
2490 : :
2491 : 66612 : void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2492 : : struct ext4_group_desc *gdp)
2493 : : {
2494 [ - + ]: 66612 : if (!ext4_has_group_desc_csum(sb))
2495 : 66613 : return;
2496 : 0 : gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2497 : : }
2498 : :
2499 : : /* Called at mount-time, super-block is locked */
2500 : 207 : static int ext4_check_descriptors(struct super_block *sb,
2501 : : ext4_fsblk_t sb_block,
2502 : : ext4_group_t *first_not_zeroed)
2503 : : {
2504 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2505 : 207 : ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2506 : : ext4_fsblk_t last_block;
2507 : 207 : ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
2508 : : ext4_fsblk_t block_bitmap;
2509 : : ext4_fsblk_t inode_bitmap;
2510 : : ext4_fsblk_t inode_table;
2511 : : int flexbg_flag = 0;
2512 : 207 : ext4_group_t i, grp = sbi->s_groups_count;
2513 : :
2514 [ + - ]: 207 : if (ext4_has_feature_flex_bg(sb))
2515 : : flexbg_flag = 1;
2516 : :
2517 : : ext4_debug("Checking group descriptors");
2518 : :
2519 [ + + ]: 11178 : for (i = 0; i < sbi->s_groups_count; i++) {
2520 : 10971 : struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2521 : :
2522 [ + + + - ]: 10971 : if (i == sbi->s_groups_count - 1 || flexbg_flag)
2523 : 21942 : last_block = ext4_blocks_count(sbi->s_es) - 1;
2524 : : else
2525 : 0 : last_block = first_block +
2526 : 0 : (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2527 : :
2528 [ + - - + ]: 21942 : if ((grp == sbi->s_groups_count) &&
2529 : 10971 : !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2530 : : grp = i;
2531 : :
2532 : : block_bitmap = ext4_block_bitmap(sb, gdp);
2533 [ - + ]: 10971 : if (block_bitmap == sb_block) {
2534 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2535 : : "Block bitmap for group %u overlaps "
2536 : : "superblock", i);
2537 [ # # ]: 0 : if (!sb_rdonly(sb))
2538 : : return 0;
2539 : : }
2540 [ + - - + ]: 10971 : if (block_bitmap >= sb_block + 1 &&
2541 : : block_bitmap <= last_bg_block) {
2542 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2543 : : "Block bitmap for group %u overlaps "
2544 : : "block group descriptors", i);
2545 [ # # ]: 0 : if (!sb_rdonly(sb))
2546 : : return 0;
2547 : : }
2548 [ - + ]: 10971 : if (block_bitmap < first_block || block_bitmap > last_block) {
2549 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2550 : : "Block bitmap for group %u not in group "
2551 : : "(block %llu)!", i, block_bitmap);
2552 : 0 : return 0;
2553 : : }
2554 : : inode_bitmap = ext4_inode_bitmap(sb, gdp);
2555 [ - + ]: 10971 : if (inode_bitmap == sb_block) {
2556 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2557 : : "Inode bitmap for group %u overlaps "
2558 : : "superblock", i);
2559 [ # # ]: 0 : if (!sb_rdonly(sb))
2560 : : return 0;
2561 : : }
2562 [ + - - + ]: 10971 : if (inode_bitmap >= sb_block + 1 &&
2563 : : inode_bitmap <= last_bg_block) {
2564 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2565 : : "Inode bitmap for group %u overlaps "
2566 : : "block group descriptors", i);
2567 [ # # ]: 0 : if (!sb_rdonly(sb))
2568 : : return 0;
2569 : : }
2570 [ - + ]: 10971 : if (inode_bitmap < first_block || inode_bitmap > last_block) {
2571 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2572 : : "Inode bitmap for group %u not in group "
2573 : : "(block %llu)!", i, inode_bitmap);
2574 : 0 : return 0;
2575 : : }
2576 : : inode_table = ext4_inode_table(sb, gdp);
2577 [ - + ]: 10971 : if (inode_table == sb_block) {
2578 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2579 : : "Inode table for group %u overlaps "
2580 : : "superblock", i);
2581 [ # # ]: 0 : if (!sb_rdonly(sb))
2582 : : return 0;
2583 : : }
2584 [ + - - + ]: 10971 : if (inode_table >= sb_block + 1 &&
2585 : : inode_table <= last_bg_block) {
2586 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2587 : : "Inode table for group %u overlaps "
2588 : : "block group descriptors", i);
2589 [ # # ]: 0 : if (!sb_rdonly(sb))
2590 : : return 0;
2591 : : }
2592 [ + - - + ]: 21942 : if (inode_table < first_block ||
2593 : 10971 : inode_table + sbi->s_itb_per_group - 1 > last_block) {
2594 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2595 : : "Inode table for group %u not in group "
2596 : : "(block %llu)!", i, inode_table);
2597 : 0 : return 0;
2598 : : }
2599 : 10971 : ext4_lock_group(sb, i);
2600 [ - + ]: 10971 : if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2601 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2602 : : "Checksum for group %u failed (%u!=%u)",
2603 : : i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2604 : : gdp)), le16_to_cpu(gdp->bg_checksum));
2605 [ # # ]: 0 : if (!sb_rdonly(sb)) {
2606 : : ext4_unlock_group(sb, i);
2607 : 0 : return 0;
2608 : : }
2609 : : }
2610 : : ext4_unlock_group(sb, i);
2611 [ - + ]: 10971 : if (!flexbg_flag)
2612 : 0 : first_block += EXT4_BLOCKS_PER_GROUP(sb);
2613 : : }
2614 [ + - ]: 207 : if (NULL != first_not_zeroed)
2615 : 207 : *first_not_zeroed = grp;
2616 : : return 1;
2617 : : }
2618 : :
2619 : : /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2620 : : * the superblock) which were deleted from all directories, but held open by
2621 : : * a process at the time of a crash. We walk the list and try to delete these
2622 : : * inodes at recovery time (only with a read-write filesystem).
2623 : : *
2624 : : * In order to keep the orphan inode chain consistent during traversal (in
2625 : : * case of crash during recovery), we link each inode into the superblock
2626 : : * orphan list_head and handle it the same way as an inode deletion during
2627 : : * normal operation (which journals the operations for us).
2628 : : *
2629 : : * We only do an iget() and an iput() on each inode, which is very safe if we
2630 : : * accidentally point at an in-use or already deleted inode. The worst that
2631 : : * can happen in this case is that we get a "bit already cleared" message from
2632 : : * ext4_free_inode(). The only reason we would point at a wrong inode is if
2633 : : * e2fsck was run on this filesystem, and it must have already done the orphan
2634 : : * inode cleanup for us, so we can safely abort without any further action.
2635 : : */
2636 : 207 : static void ext4_orphan_cleanup(struct super_block *sb,
2637 : : struct ext4_super_block *es)
2638 : : {
2639 : 207 : unsigned int s_flags = sb->s_flags;
2640 : : int ret, nr_orphans = 0, nr_truncates = 0;
2641 : : #ifdef CONFIG_QUOTA
2642 : : int quota_update = 0;
2643 : : int i;
2644 : : #endif
2645 [ - + ]: 207 : if (!es->s_last_orphan) {
2646 : : jbd_debug(4, "no orphan inodes to clean up\n");
2647 : : return;
2648 : : }
2649 : :
2650 [ # # ]: 0 : if (bdev_read_only(sb->s_bdev)) {
2651 : 0 : ext4_msg(sb, KERN_ERR, "write access "
2652 : : "unavailable, skipping orphan cleanup");
2653 : 0 : return;
2654 : : }
2655 : :
2656 : : /* Check if feature set would not allow a r/w mount */
2657 [ # # ]: 0 : if (!ext4_feature_set_ok(sb, 0)) {
2658 : 0 : ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2659 : : "unknown ROCOMPAT features");
2660 : 0 : return;
2661 : : }
2662 : :
2663 [ # # ]: 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2664 : : /* don't clear list on RO mount w/ errors */
2665 [ # # # # ]: 0 : if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2666 : 0 : ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2667 : : "clearing orphan list.\n");
2668 : 0 : es->s_last_orphan = 0;
2669 : : }
2670 : : jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2671 : : return;
2672 : : }
2673 : :
2674 [ # # ]: 0 : if (s_flags & SB_RDONLY) {
2675 : 0 : ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2676 : 0 : sb->s_flags &= ~SB_RDONLY;
2677 : : }
2678 : : #ifdef CONFIG_QUOTA
2679 : : /* Needed for iput() to work correctly and not trash data */
2680 : 0 : sb->s_flags |= SB_ACTIVE;
2681 : :
2682 : : /*
2683 : : * Turn on quotas which were not enabled for read-only mounts if
2684 : : * filesystem has quota feature, so that they are updated correctly.
2685 : : */
2686 [ # # # # ]: 0 : if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
2687 : 0 : int ret = ext4_enable_quotas(sb);
2688 : :
2689 [ # # ]: 0 : if (!ret)
2690 : : quota_update = 1;
2691 : : else
2692 : 0 : ext4_msg(sb, KERN_ERR,
2693 : : "Cannot turn on quotas: error %d", ret);
2694 : : }
2695 : :
2696 : : /* Turn on journaled quotas used for old sytle */
2697 [ # # ]: 0 : for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2698 [ # # ]: 0 : if (EXT4_SB(sb)->s_qf_names[i]) {
2699 : : int ret = ext4_quota_on_mount(sb, i);
2700 : :
2701 [ # # ]: 0 : if (!ret)
2702 : : quota_update = 1;
2703 : : else
2704 : 0 : ext4_msg(sb, KERN_ERR,
2705 : : "Cannot turn on journaled "
2706 : : "quota: type %d: error %d", i, ret);
2707 : : }
2708 : : }
2709 : : #endif
2710 : :
2711 [ # # ]: 0 : while (es->s_last_orphan) {
2712 : : struct inode *inode;
2713 : :
2714 : : /*
2715 : : * We may have encountered an error during cleanup; if
2716 : : * so, skip the rest.
2717 : : */
2718 [ # # ]: 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2719 : : jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2720 : 0 : es->s_last_orphan = 0;
2721 : 0 : break;
2722 : : }
2723 : :
2724 : 0 : inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2725 [ # # ]: 0 : if (IS_ERR(inode)) {
2726 : 0 : es->s_last_orphan = 0;
2727 : 0 : break;
2728 : : }
2729 : :
2730 : 0 : list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2731 : 0 : dquot_initialize(inode);
2732 [ # # ]: 0 : if (inode->i_nlink) {
2733 [ # # ]: 0 : if (test_opt(sb, DEBUG))
2734 : 0 : ext4_msg(sb, KERN_DEBUG,
2735 : : "%s: truncating inode %lu to %lld bytes",
2736 : : __func__, inode->i_ino, inode->i_size);
2737 : : jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2738 : : inode->i_ino, inode->i_size);
2739 : : inode_lock(inode);
2740 : 0 : truncate_inode_pages(inode->i_mapping, inode->i_size);
2741 : 0 : ret = ext4_truncate(inode);
2742 [ # # ]: 0 : if (ret)
2743 [ # # ]: 0 : ext4_std_error(inode->i_sb, ret);
2744 : : inode_unlock(inode);
2745 : 0 : nr_truncates++;
2746 : : } else {
2747 [ # # ]: 0 : if (test_opt(sb, DEBUG))
2748 : 0 : ext4_msg(sb, KERN_DEBUG,
2749 : : "%s: deleting unreferenced inode %lu",
2750 : : __func__, inode->i_ino);
2751 : : jbd_debug(2, "deleting unreferenced inode %lu\n",
2752 : : inode->i_ino);
2753 : 0 : nr_orphans++;
2754 : : }
2755 : 0 : iput(inode); /* The delete magic happens here! */
2756 : : }
2757 : :
2758 : : #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2759 : :
2760 [ # # ]: 0 : if (nr_orphans)
2761 [ # # ]: 0 : ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2762 : : PLURAL(nr_orphans));
2763 [ # # ]: 0 : if (nr_truncates)
2764 [ # # ]: 0 : ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2765 : : PLURAL(nr_truncates));
2766 : : #ifdef CONFIG_QUOTA
2767 : : /* Turn off quotas if they were enabled for orphan cleanup */
2768 [ # # ]: 0 : if (quota_update) {
2769 [ # # ]: 0 : for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2770 [ # # ]: 0 : if (sb_dqopt(sb)->files[i])
2771 : 0 : dquot_quota_off(sb, i);
2772 : : }
2773 : : }
2774 : : #endif
2775 : 0 : sb->s_flags = s_flags; /* Restore SB_RDONLY status */
2776 : : }
2777 : :
2778 : : /*
2779 : : * Maximal extent format file size.
2780 : : * Resulting logical blkno at s_maxbytes must fit in our on-disk
2781 : : * extent format containers, within a sector_t, and within i_blocks
2782 : : * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2783 : : * so that won't be a limiting factor.
2784 : : *
2785 : : * However there is other limiting factor. We do store extents in the form
2786 : : * of starting block and length, hence the resulting length of the extent
2787 : : * covering maximum file size must fit into on-disk format containers as
2788 : : * well. Given that length is always by 1 unit bigger than max unit (because
2789 : : * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2790 : : *
2791 : : * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2792 : : */
2793 : : static loff_t ext4_max_size(int blkbits, int has_huge_files)
2794 : : {
2795 : : loff_t res;
2796 : : loff_t upper_limit = MAX_LFS_FILESIZE;
2797 : :
2798 : : BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2799 : :
2800 [ + - ]: 207 : if (!has_huge_files) {
2801 : : upper_limit = (1LL << 32) - 1;
2802 : :
2803 : : /* total blocks in file system block size */
2804 : 207 : upper_limit >>= (blkbits - 9);
2805 : 207 : upper_limit <<= blkbits;
2806 : : }
2807 : :
2808 : : /*
2809 : : * 32-bit extent-start container, ee_block. We lower the maxbytes
2810 : : * by one fs block, so ee_len can cover the extent of maximum file
2811 : : * size
2812 : : */
2813 : : res = (1LL << 32) - 1;
2814 : 207 : res <<= blkbits;
2815 : :
2816 : : /* Sanity check against vm- & vfs- imposed limits */
2817 [ + - ]: 207 : if (res > upper_limit)
2818 : : res = upper_limit;
2819 : :
2820 : : return res;
2821 : : }
2822 : :
2823 : : /*
2824 : : * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2825 : : * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2826 : : * We need to be 1 filesystem block less than the 2^48 sector limit.
2827 : : */
2828 : 207 : static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2829 : : {
2830 : : loff_t res = EXT4_NDIR_BLOCKS;
2831 : : int meta_blocks;
2832 : : loff_t upper_limit;
2833 : : /* This is calculated to be the largest file size for a dense, block
2834 : : * mapped file such that the file's total number of 512-byte sectors,
2835 : : * including data and all indirect blocks, does not exceed (2^48 - 1).
2836 : : *
2837 : : * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2838 : : * number of 512-byte sectors of the file.
2839 : : */
2840 : :
2841 [ + - ]: 207 : if (!has_huge_files) {
2842 : : /*
2843 : : * !has_huge_files or implies that the inode i_block field
2844 : : * represents total file blocks in 2^32 512-byte sectors ==
2845 : : * size of vfs inode i_blocks * 8
2846 : : */
2847 : : upper_limit = (1LL << 32) - 1;
2848 : :
2849 : : /* total blocks in file system block size */
2850 : 207 : upper_limit >>= (bits - 9);
2851 : :
2852 : : } else {
2853 : : /*
2854 : : * We use 48 bit ext4_inode i_blocks
2855 : : * With EXT4_HUGE_FILE_FL set the i_blocks
2856 : : * represent total number of blocks in
2857 : : * file system block size
2858 : : */
2859 : : upper_limit = (1LL << 48) - 1;
2860 : :
2861 : : }
2862 : :
2863 : : /* indirect blocks */
2864 : : meta_blocks = 1;
2865 : : /* double indirect blocks */
2866 : 207 : meta_blocks += 1 + (1LL << (bits-2));
2867 : : /* tripple indirect blocks */
2868 : 207 : meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2869 : :
2870 : 207 : upper_limit -= meta_blocks;
2871 : 207 : upper_limit <<= bits;
2872 : :
2873 : 207 : res += 1LL << (bits-2);
2874 : 207 : res += 1LL << (2*(bits-2));
2875 : 207 : res += 1LL << (3*(bits-2));
2876 : 207 : res <<= bits;
2877 [ + - ]: 207 : if (res > upper_limit)
2878 : : res = upper_limit;
2879 : :
2880 [ - + ]: 207 : if (res > MAX_LFS_FILESIZE)
2881 : : res = MAX_LFS_FILESIZE;
2882 : :
2883 : 207 : return res;
2884 : : }
2885 : :
2886 : 414 : static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2887 : : ext4_fsblk_t logical_sb_block, int nr)
2888 : : {
2889 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2890 : : ext4_group_t bg, first_meta_bg;
2891 : : int has_super = 0;
2892 : :
2893 : 414 : first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2894 : :
2895 [ - + # # ]: 414 : if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2896 : 414 : return logical_sb_block + nr + 1;
2897 : 0 : bg = sbi->s_desc_per_block * nr;
2898 [ # # ]: 0 : if (ext4_bg_has_super(sb, bg))
2899 : : has_super = 1;
2900 : :
2901 : : /*
2902 : : * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2903 : : * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2904 : : * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2905 : : * compensate.
2906 : : */
2907 [ # # # # : 0 : if (sb->s_blocksize == 1024 && nr == 0 &&
# # ]
2908 : 0 : le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
2909 : 0 : has_super++;
2910 : :
2911 : 0 : return (has_super + ext4_group_first_block_no(sb, bg));
2912 : : }
2913 : :
2914 : : /**
2915 : : * ext4_get_stripe_size: Get the stripe size.
2916 : : * @sbi: In memory super block info
2917 : : *
2918 : : * If we have specified it via mount option, then
2919 : : * use the mount option value. If the value specified at mount time is
2920 : : * greater than the blocks per group use the super block value.
2921 : : * If the super block value is greater than blocks per group return 0.
2922 : : * Allocator needs it be less than blocks per group.
2923 : : *
2924 : : */
2925 : 207 : static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2926 : : {
2927 : 207 : unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2928 : 207 : unsigned long stripe_width =
2929 : : le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2930 : : int ret;
2931 : :
2932 [ - + # # ]: 207 : if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2933 : 0 : ret = sbi->s_stripe;
2934 [ - + # # ]: 207 : else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2935 : 0 : ret = stripe_width;
2936 [ - + # # ]: 207 : else if (stride && stride <= sbi->s_blocks_per_group)
2937 : 0 : ret = stride;
2938 : : else
2939 : : ret = 0;
2940 : :
2941 : : /*
2942 : : * If the stripe width is 1, this makes no sense and
2943 : : * we set it to 0 to turn off stripe handling code.
2944 : : */
2945 [ + - ]: 207 : if (ret <= 1)
2946 : : ret = 0;
2947 : :
2948 : 207 : return ret;
2949 : : }
2950 : :
2951 : : /*
2952 : : * Check whether this filesystem can be mounted based on
2953 : : * the features present and the RDONLY/RDWR mount requested.
2954 : : * Returns 1 if this filesystem can be mounted as requested,
2955 : : * 0 if it cannot be.
2956 : : */
2957 : 414 : static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2958 : : {
2959 [ - + ]: 414 : if (ext4_has_unknown_ext4_incompat_features(sb)) {
2960 : 0 : ext4_msg(sb, KERN_ERR,
2961 : : "Couldn't mount because of "
2962 : : "unsupported optional features (%x)",
2963 : : (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2964 : : ~EXT4_FEATURE_INCOMPAT_SUPP));
2965 : 0 : return 0;
2966 : : }
2967 : :
2968 : : #ifndef CONFIG_UNICODE
2969 [ - + ]: 414 : if (ext4_has_feature_casefold(sb)) {
2970 : 0 : ext4_msg(sb, KERN_ERR,
2971 : : "Filesystem with casefold feature cannot be "
2972 : : "mounted without CONFIG_UNICODE");
2973 : 0 : return 0;
2974 : : }
2975 : : #endif
2976 : :
2977 [ + + ]: 414 : if (readonly)
2978 : : return 1;
2979 : :
2980 [ - + ]: 207 : if (ext4_has_feature_readonly(sb)) {
2981 : 0 : ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2982 : 0 : sb->s_flags |= SB_RDONLY;
2983 : 0 : return 1;
2984 : : }
2985 : :
2986 : : /* Check that feature set is OK for a read-write mount */
2987 [ - + ]: 207 : if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2988 : 0 : ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2989 : : "unsupported optional features (%x)",
2990 : : (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2991 : : ~EXT4_FEATURE_RO_COMPAT_SUPP));
2992 : 0 : return 0;
2993 : : }
2994 [ - + # # ]: 207 : if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2995 : 0 : ext4_msg(sb, KERN_ERR,
2996 : : "Can't support bigalloc feature without "
2997 : : "extents feature\n");
2998 : 0 : return 0;
2999 : : }
3000 : :
3001 : : #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3002 : : if (!readonly && (ext4_has_feature_quota(sb) ||
3003 : : ext4_has_feature_project(sb))) {
3004 : : ext4_msg(sb, KERN_ERR,
3005 : : "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3006 : : return 0;
3007 : : }
3008 : : #endif /* CONFIG_QUOTA */
3009 : : return 1;
3010 : : }
3011 : :
3012 : : /*
3013 : : * This function is called once a day if we have errors logged
3014 : : * on the file system
3015 : : */
3016 : 0 : static void print_daily_error_info(struct timer_list *t)
3017 : : {
3018 : : struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3019 : 0 : struct super_block *sb = sbi->s_sb;
3020 : 0 : struct ext4_super_block *es = sbi->s_es;
3021 : :
3022 [ # # ]: 0 : if (es->s_error_count)
3023 : : /* fsck newer than v1.41.13 is needed to clean this condition. */
3024 : 0 : ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3025 : : le32_to_cpu(es->s_error_count));
3026 [ # # ]: 0 : if (es->s_first_error_time) {
3027 : 0 : printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3028 : 0 : sb->s_id,
3029 : : ext4_get_tstamp(es, s_first_error_time),
3030 : : (int) sizeof(es->s_first_error_func),
3031 : 0 : es->s_first_error_func,
3032 : : le32_to_cpu(es->s_first_error_line));
3033 [ # # ]: 0 : if (es->s_first_error_ino)
3034 : 0 : printk(KERN_CONT ": inode %u",
3035 : : le32_to_cpu(es->s_first_error_ino));
3036 [ # # ]: 0 : if (es->s_first_error_block)
3037 : 0 : printk(KERN_CONT ": block %llu", (unsigned long long)
3038 : : le64_to_cpu(es->s_first_error_block));
3039 : 0 : printk(KERN_CONT "\n");
3040 : : }
3041 [ # # ]: 0 : if (es->s_last_error_time) {
3042 : 0 : printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3043 : 0 : sb->s_id,
3044 : : ext4_get_tstamp(es, s_last_error_time),
3045 : : (int) sizeof(es->s_last_error_func),
3046 : 0 : es->s_last_error_func,
3047 : : le32_to_cpu(es->s_last_error_line));
3048 [ # # ]: 0 : if (es->s_last_error_ino)
3049 : 0 : printk(KERN_CONT ": inode %u",
3050 : : le32_to_cpu(es->s_last_error_ino));
3051 [ # # ]: 0 : if (es->s_last_error_block)
3052 : 0 : printk(KERN_CONT ": block %llu", (unsigned long long)
3053 : : le64_to_cpu(es->s_last_error_block));
3054 : 0 : printk(KERN_CONT "\n");
3055 : : }
3056 : 0 : mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3057 : 0 : }
3058 : :
3059 : : /* Find next suitable group and run ext4_init_inode_table */
3060 : 0 : static int ext4_run_li_request(struct ext4_li_request *elr)
3061 : : {
3062 : : struct ext4_group_desc *gdp = NULL;
3063 : : ext4_group_t group, ngroups;
3064 : : struct super_block *sb;
3065 : : unsigned long timeout = 0;
3066 : : int ret = 0;
3067 : :
3068 : 0 : sb = elr->lr_super;
3069 : 0 : ngroups = EXT4_SB(sb)->s_groups_count;
3070 : :
3071 [ # # ]: 0 : for (group = elr->lr_next_group; group < ngroups; group++) {
3072 : 0 : gdp = ext4_get_group_desc(sb, group, NULL);
3073 [ # # ]: 0 : if (!gdp) {
3074 : : ret = 1;
3075 : : break;
3076 : : }
3077 : :
3078 [ # # ]: 0 : if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3079 : : break;
3080 : : }
3081 : :
3082 [ # # ]: 0 : if (group >= ngroups)
3083 : : ret = 1;
3084 : :
3085 [ # # ]: 0 : if (!ret) {
3086 : 0 : timeout = jiffies;
3087 : 0 : ret = ext4_init_inode_table(sb, group,
3088 : 0 : elr->lr_timeout ? 0 : 1);
3089 [ # # ]: 0 : if (elr->lr_timeout == 0) {
3090 : 0 : timeout = (jiffies - timeout) *
3091 : 0 : elr->lr_sbi->s_li_wait_mult;
3092 : 0 : elr->lr_timeout = timeout;
3093 : : }
3094 : 0 : elr->lr_next_sched = jiffies + elr->lr_timeout;
3095 : 0 : elr->lr_next_group = group + 1;
3096 : : }
3097 : 0 : return ret;
3098 : : }
3099 : :
3100 : : /*
3101 : : * Remove lr_request from the list_request and free the
3102 : : * request structure. Should be called with li_list_mtx held
3103 : : */
3104 : 0 : static void ext4_remove_li_request(struct ext4_li_request *elr)
3105 : : {
3106 : : struct ext4_sb_info *sbi;
3107 : :
3108 [ # # ]: 0 : if (!elr)
3109 : 0 : return;
3110 : :
3111 : 0 : sbi = elr->lr_sbi;
3112 : :
3113 : : list_del(&elr->lr_request);
3114 : 0 : sbi->s_li_request = NULL;
3115 : 0 : kfree(elr);
3116 : : }
3117 : :
3118 : 0 : static void ext4_unregister_li_request(struct super_block *sb)
3119 : : {
3120 : 0 : mutex_lock(&ext4_li_mtx);
3121 [ # # ]: 0 : if (!ext4_li_info) {
3122 : 0 : mutex_unlock(&ext4_li_mtx);
3123 : 0 : return;
3124 : : }
3125 : :
3126 : 0 : mutex_lock(&ext4_li_info->li_list_mtx);
3127 : 0 : ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3128 : 0 : mutex_unlock(&ext4_li_info->li_list_mtx);
3129 : 0 : mutex_unlock(&ext4_li_mtx);
3130 : : }
3131 : :
3132 : : static struct task_struct *ext4_lazyinit_task;
3133 : :
3134 : : /*
3135 : : * This is the function where ext4lazyinit thread lives. It walks
3136 : : * through the request list searching for next scheduled filesystem.
3137 : : * When such a fs is found, run the lazy initialization request
3138 : : * (ext4_rn_li_request) and keep track of the time spend in this
3139 : : * function. Based on that time we compute next schedule time of
3140 : : * the request. When walking through the list is complete, compute
3141 : : * next waking time and put itself into sleep.
3142 : : */
3143 : 0 : static int ext4_lazyinit_thread(void *arg)
3144 : : {
3145 : : struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3146 : : struct list_head *pos, *n;
3147 : : struct ext4_li_request *elr;
3148 : : unsigned long next_wakeup, cur;
3149 : :
3150 [ # # ]: 0 : BUG_ON(NULL == eli);
3151 : :
3152 : : cont_thread:
3153 : : while (true) {
3154 : : next_wakeup = MAX_JIFFY_OFFSET;
3155 : :
3156 : 0 : mutex_lock(&eli->li_list_mtx);
3157 [ # # ]: 0 : if (list_empty(&eli->li_request_list)) {
3158 : 0 : mutex_unlock(&eli->li_list_mtx);
3159 : 0 : goto exit_thread;
3160 : : }
3161 [ # # ]: 0 : list_for_each_safe(pos, n, &eli->li_request_list) {
3162 : : int err = 0;
3163 : : int progress = 0;
3164 : 0 : elr = list_entry(pos, struct ext4_li_request,
3165 : : lr_request);
3166 : :
3167 [ # # ]: 0 : if (time_before(jiffies, elr->lr_next_sched)) {
3168 [ # # ]: 0 : if (time_before(elr->lr_next_sched, next_wakeup))
3169 : : next_wakeup = elr->lr_next_sched;
3170 : 0 : continue;
3171 : : }
3172 [ # # ]: 0 : if (down_read_trylock(&elr->lr_super->s_umount)) {
3173 [ # # ]: 0 : if (sb_start_write_trylock(elr->lr_super)) {
3174 : : progress = 1;
3175 : : /*
3176 : : * We hold sb->s_umount, sb can not
3177 : : * be removed from the list, it is
3178 : : * now safe to drop li_list_mtx
3179 : : */
3180 : 0 : mutex_unlock(&eli->li_list_mtx);
3181 : 0 : err = ext4_run_li_request(elr);
3182 : 0 : sb_end_write(elr->lr_super);
3183 : 0 : mutex_lock(&eli->li_list_mtx);
3184 : 0 : n = pos->next;
3185 : : }
3186 : 0 : up_read((&elr->lr_super->s_umount));
3187 : : }
3188 : : /* error, remove the lazy_init job */
3189 [ # # ]: 0 : if (err) {
3190 : 0 : ext4_remove_li_request(elr);
3191 : 0 : continue;
3192 : : }
3193 [ # # ]: 0 : if (!progress) {
3194 : 0 : elr->lr_next_sched = jiffies +
3195 : 0 : (prandom_u32()
3196 : 0 : % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3197 : : }
3198 [ # # ]: 0 : if (time_before(elr->lr_next_sched, next_wakeup))
3199 : : next_wakeup = elr->lr_next_sched;
3200 : : }
3201 : 0 : mutex_unlock(&eli->li_list_mtx);
3202 : :
3203 : : try_to_freeze();
3204 : :
3205 : 0 : cur = jiffies;
3206 [ # # # # ]: 0 : if ((time_after_eq(cur, next_wakeup)) ||
3207 : : (MAX_JIFFY_OFFSET == next_wakeup)) {
3208 : 0 : cond_resched();
3209 : 0 : continue;
3210 : : }
3211 : :
3212 : 0 : schedule_timeout_interruptible(next_wakeup - cur);
3213 : :
3214 [ # # ]: 0 : if (kthread_should_stop()) {
3215 : 0 : ext4_clear_request_list();
3216 : 0 : goto exit_thread;
3217 : : }
3218 : : }
3219 : :
3220 : : exit_thread:
3221 : : /*
3222 : : * It looks like the request list is empty, but we need
3223 : : * to check it under the li_list_mtx lock, to prevent any
3224 : : * additions into it, and of course we should lock ext4_li_mtx
3225 : : * to atomically free the list and ext4_li_info, because at
3226 : : * this point another ext4 filesystem could be registering
3227 : : * new one.
3228 : : */
3229 : 0 : mutex_lock(&ext4_li_mtx);
3230 : 0 : mutex_lock(&eli->li_list_mtx);
3231 [ # # ]: 0 : if (!list_empty(&eli->li_request_list)) {
3232 : 0 : mutex_unlock(&eli->li_list_mtx);
3233 : 0 : mutex_unlock(&ext4_li_mtx);
3234 : 0 : goto cont_thread;
3235 : : }
3236 : 0 : mutex_unlock(&eli->li_list_mtx);
3237 : 0 : kfree(ext4_li_info);
3238 : 0 : ext4_li_info = NULL;
3239 : 0 : mutex_unlock(&ext4_li_mtx);
3240 : :
3241 : 0 : return 0;
3242 : : }
3243 : :
3244 : 0 : static void ext4_clear_request_list(void)
3245 : : {
3246 : : struct list_head *pos, *n;
3247 : : struct ext4_li_request *elr;
3248 : :
3249 : 0 : mutex_lock(&ext4_li_info->li_list_mtx);
3250 [ # # ]: 0 : list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3251 : 0 : elr = list_entry(pos, struct ext4_li_request,
3252 : : lr_request);
3253 : 0 : ext4_remove_li_request(elr);
3254 : : }
3255 : 0 : mutex_unlock(&ext4_li_info->li_list_mtx);
3256 : 0 : }
3257 : :
3258 : 0 : static int ext4_run_lazyinit_thread(void)
3259 : : {
3260 [ # # ]: 0 : ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3261 : : ext4_li_info, "ext4lazyinit");
3262 [ # # ]: 0 : if (IS_ERR(ext4_lazyinit_task)) {
3263 : : int err = PTR_ERR(ext4_lazyinit_task);
3264 : 0 : ext4_clear_request_list();
3265 : 0 : kfree(ext4_li_info);
3266 : 0 : ext4_li_info = NULL;
3267 : 0 : printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3268 : : "initialization thread\n",
3269 : : err);
3270 : 0 : return err;
3271 : : }
3272 : 0 : ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3273 : 0 : return 0;
3274 : : }
3275 : :
3276 : : /*
3277 : : * Check whether it make sense to run itable init. thread or not.
3278 : : * If there is at least one uninitialized inode table, return
3279 : : * corresponding group number, else the loop goes through all
3280 : : * groups and return total number of groups.
3281 : : */
3282 : 207 : static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3283 : : {
3284 : 207 : ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3285 : : struct ext4_group_desc *gdp = NULL;
3286 : :
3287 [ - + ]: 207 : if (!ext4_has_group_desc_csum(sb))
3288 : : return ngroups;
3289 : :
3290 [ # # ]: 0 : for (group = 0; group < ngroups; group++) {
3291 : 0 : gdp = ext4_get_group_desc(sb, group, NULL);
3292 [ # # ]: 0 : if (!gdp)
3293 : 0 : continue;
3294 : :
3295 [ # # ]: 0 : if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3296 : : break;
3297 : : }
3298 : :
3299 : 0 : return group;
3300 : : }
3301 : :
3302 : 0 : static int ext4_li_info_new(void)
3303 : : {
3304 : : struct ext4_lazy_init *eli = NULL;
3305 : :
3306 : 0 : eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3307 [ # # ]: 0 : if (!eli)
3308 : : return -ENOMEM;
3309 : :
3310 : 0 : INIT_LIST_HEAD(&eli->li_request_list);
3311 : 0 : mutex_init(&eli->li_list_mtx);
3312 : :
3313 : 0 : eli->li_state |= EXT4_LAZYINIT_QUIT;
3314 : :
3315 : 0 : ext4_li_info = eli;
3316 : :
3317 : 0 : return 0;
3318 : : }
3319 : :
3320 : 0 : static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3321 : : ext4_group_t start)
3322 : : {
3323 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3324 : : struct ext4_li_request *elr;
3325 : :
3326 : 0 : elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3327 [ # # ]: 0 : if (!elr)
3328 : : return NULL;
3329 : :
3330 : 0 : elr->lr_super = sb;
3331 : 0 : elr->lr_sbi = sbi;
3332 : 0 : elr->lr_next_group = start;
3333 : :
3334 : : /*
3335 : : * Randomize first schedule time of the request to
3336 : : * spread the inode table initialization requests
3337 : : * better.
3338 : : */
3339 : 0 : elr->lr_next_sched = jiffies + (prandom_u32() %
3340 : : (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3341 : 0 : return elr;
3342 : : }
3343 : :
3344 : 414 : int ext4_register_li_request(struct super_block *sb,
3345 : : ext4_group_t first_not_zeroed)
3346 : : {
3347 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3348 : : struct ext4_li_request *elr = NULL;
3349 : 414 : ext4_group_t ngroups = sbi->s_groups_count;
3350 : : int ret = 0;
3351 : :
3352 : 414 : mutex_lock(&ext4_li_mtx);
3353 [ - + ]: 414 : if (sbi->s_li_request != NULL) {
3354 : : /*
3355 : : * Reset timeout so it can be computed again, because
3356 : : * s_li_wait_mult might have changed.
3357 : : */
3358 : 0 : sbi->s_li_request->lr_timeout = 0;
3359 : 0 : goto out;
3360 : : }
3361 : :
3362 [ - + # # : 414 : if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
# # ]
3363 : 0 : !test_opt(sb, INIT_INODE_TABLE))
3364 : : goto out;
3365 : :
3366 : 0 : elr = ext4_li_request_new(sb, first_not_zeroed);
3367 [ # # ]: 0 : if (!elr) {
3368 : : ret = -ENOMEM;
3369 : : goto out;
3370 : : }
3371 : :
3372 [ # # ]: 0 : if (NULL == ext4_li_info) {
3373 : 0 : ret = ext4_li_info_new();
3374 [ # # ]: 0 : if (ret)
3375 : : goto out;
3376 : : }
3377 : :
3378 : 0 : mutex_lock(&ext4_li_info->li_list_mtx);
3379 : 0 : list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3380 : 0 : mutex_unlock(&ext4_li_info->li_list_mtx);
3381 : :
3382 : 0 : sbi->s_li_request = elr;
3383 : : /*
3384 : : * set elr to NULL here since it has been inserted to
3385 : : * the request_list and the removal and free of it is
3386 : : * handled by ext4_clear_request_list from now on.
3387 : : */
3388 : : elr = NULL;
3389 : :
3390 [ # # ]: 0 : if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3391 : 0 : ret = ext4_run_lazyinit_thread();
3392 : : if (ret)
3393 : : goto out;
3394 : : }
3395 : : out:
3396 : 414 : mutex_unlock(&ext4_li_mtx);
3397 [ - + ]: 414 : if (ret)
3398 : 0 : kfree(elr);
3399 : 414 : return ret;
3400 : : }
3401 : :
3402 : : /*
3403 : : * We do not need to lock anything since this is called on
3404 : : * module unload.
3405 : : */
3406 : 0 : static void ext4_destroy_lazyinit_thread(void)
3407 : : {
3408 : : /*
3409 : : * If thread exited earlier
3410 : : * there's nothing to be done.
3411 : : */
3412 [ # # # # ]: 0 : if (!ext4_li_info || !ext4_lazyinit_task)
3413 : 0 : return;
3414 : :
3415 : 0 : kthread_stop(ext4_lazyinit_task);
3416 : : }
3417 : :
3418 : 207 : static int set_journal_csum_feature_set(struct super_block *sb)
3419 : : {
3420 : : int ret = 1;
3421 : : int compat, incompat;
3422 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3423 : :
3424 [ + - ]: 207 : if (ext4_has_metadata_csum(sb)) {
3425 : : /* journal checksum v3 */
3426 : : compat = 0;
3427 : : incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3428 : : } else {
3429 : : /* journal checksum v1 */
3430 : : compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3431 : : incompat = 0;
3432 : : }
3433 : :
3434 : 207 : jbd2_journal_clear_features(sbi->s_journal,
3435 : : JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3436 : : JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3437 : : JBD2_FEATURE_INCOMPAT_CSUM_V2);
3438 [ - + ]: 207 : if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3439 : 0 : ret = jbd2_journal_set_features(sbi->s_journal,
3440 : : compat, 0,
3441 : 0 : JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3442 : : incompat);
3443 [ - + ]: 207 : } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3444 : 0 : ret = jbd2_journal_set_features(sbi->s_journal,
3445 : : compat, 0,
3446 : : incompat);
3447 : 0 : jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3448 : : JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3449 : : } else {
3450 : 207 : jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3451 : : JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3452 : : }
3453 : :
3454 : 207 : return ret;
3455 : : }
3456 : :
3457 : : /*
3458 : : * Note: calculating the overhead so we can be compatible with
3459 : : * historical BSD practice is quite difficult in the face of
3460 : : * clusters/bigalloc. This is because multiple metadata blocks from
3461 : : * different block group can end up in the same allocation cluster.
3462 : : * Calculating the exact overhead in the face of clustered allocation
3463 : : * requires either O(all block bitmaps) in memory or O(number of block
3464 : : * groups**2) in time. We will still calculate the superblock for
3465 : : * older file systems --- and if we come across with a bigalloc file
3466 : : * system with zero in s_overhead_clusters the estimate will be close to
3467 : : * correct especially for very large cluster sizes --- but for newer
3468 : : * file systems, it's better to calculate this figure once at mkfs
3469 : : * time, and store it in the superblock. If the superblock value is
3470 : : * present (even for non-bigalloc file systems), we will use it.
3471 : : */
3472 : 10971 : static int count_overhead(struct super_block *sb, ext4_group_t grp,
3473 : : char *buf)
3474 : : {
3475 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3476 : : struct ext4_group_desc *gdp;
3477 : : ext4_fsblk_t first_block, last_block, b;
3478 : : ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3479 : : int s, j, count = 0;
3480 : :
3481 [ + - ]: 10971 : if (!ext4_has_feature_bigalloc(sb))
3482 : 32913 : return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3483 : 21942 : sbi->s_itb_per_group + 2);
3484 : :
3485 : 0 : first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3486 : 0 : (grp * EXT4_BLOCKS_PER_GROUP(sb));
3487 : 0 : last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3488 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
3489 : 0 : gdp = ext4_get_group_desc(sb, i, NULL);
3490 : : b = ext4_block_bitmap(sb, gdp);
3491 [ # # ]: 0 : if (b >= first_block && b <= last_block) {
3492 : 0 : ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3493 : 0 : count++;
3494 : : }
3495 : : b = ext4_inode_bitmap(sb, gdp);
3496 [ # # ]: 0 : if (b >= first_block && b <= last_block) {
3497 : 0 : ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3498 : 0 : count++;
3499 : : }
3500 : : b = ext4_inode_table(sb, gdp);
3501 [ # # # # ]: 0 : if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3502 [ # # ]: 0 : for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3503 : 0 : int c = EXT4_B2C(sbi, b - first_block);
3504 : : ext4_set_bit(c, buf);
3505 : 0 : count++;
3506 : : }
3507 [ # # ]: 0 : if (i != grp)
3508 : 0 : continue;
3509 : : s = 0;
3510 [ # # ]: 0 : if (ext4_bg_has_super(sb, grp)) {
3511 : : ext4_set_bit(s++, buf);
3512 : 0 : count++;
3513 : : }
3514 : 0 : j = ext4_bg_num_gdb(sb, grp);
3515 [ # # ]: 0 : if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3516 : 0 : ext4_error(sb, "Invalid number of block group "
3517 : : "descriptor blocks: %d", j);
3518 : 0 : j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3519 : : }
3520 : 0 : count += j;
3521 [ # # ]: 0 : for (; j > 0; j--)
3522 : 0 : ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3523 : : }
3524 [ # # ]: 0 : if (!count)
3525 : : return 0;
3526 : 0 : return EXT4_CLUSTERS_PER_GROUP(sb) -
3527 : 0 : ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3528 : : }
3529 : :
3530 : : /*
3531 : : * Compute the overhead and stash it in sbi->s_overhead
3532 : : */
3533 : 207 : int ext4_calculate_overhead(struct super_block *sb)
3534 : : {
3535 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3536 : 207 : struct ext4_super_block *es = sbi->s_es;
3537 : : struct inode *j_inode;
3538 : 207 : unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3539 : : ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3540 : : ext4_fsblk_t overhead = 0;
3541 : 207 : char *buf = (char *) get_zeroed_page(GFP_NOFS);
3542 : :
3543 [ + - ]: 207 : if (!buf)
3544 : : return -ENOMEM;
3545 : :
3546 : : /*
3547 : : * Compute the overhead (FS structures). This is constant
3548 : : * for a given filesystem unless the number of block groups
3549 : : * changes so we cache the previous value until it does.
3550 : : */
3551 : :
3552 : : /*
3553 : : * All of the blocks before first_data_block are overhead
3554 : : */
3555 : 207 : overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3556 : :
3557 : : /*
3558 : : * Add the overhead found in each block group
3559 : : */
3560 [ + + ]: 11178 : for (i = 0; i < ngroups; i++) {
3561 : : int blks;
3562 : :
3563 : 10971 : blks = count_overhead(sb, i, buf);
3564 : 10971 : overhead += blks;
3565 [ + - ]: 10971 : if (blks)
3566 : 10971 : memset(buf, 0, PAGE_SIZE);
3567 : 10971 : cond_resched();
3568 : : }
3569 : :
3570 : : /*
3571 : : * Add the internal journal blocks whether the journal has been
3572 : : * loaded or not
3573 : : */
3574 [ + - + - ]: 207 : if (sbi->s_journal && !sbi->journal_bdev)
3575 : 207 : overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3576 [ # # # # : 0 : else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
# # ]
3577 : : /* j_inum for internal journal is non-zero */
3578 : 0 : j_inode = ext4_get_journal_inode(sb, j_inum);
3579 [ # # ]: 0 : if (j_inode) {
3580 : 0 : j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3581 : 0 : overhead += EXT4_NUM_B2C(sbi, j_blocks);
3582 : 0 : iput(j_inode);
3583 : : } else {
3584 : 0 : ext4_msg(sb, KERN_ERR, "can't get journal size");
3585 : : }
3586 : : }
3587 : 207 : sbi->s_overhead = overhead;
3588 : 207 : smp_wmb();
3589 : 207 : free_page((unsigned long) buf);
3590 : 207 : return 0;
3591 : : }
3592 : :
3593 : 207 : static void ext4_set_resv_clusters(struct super_block *sb)
3594 : : {
3595 : : ext4_fsblk_t resv_clusters;
3596 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3597 : :
3598 : : /*
3599 : : * There's no need to reserve anything when we aren't using extents.
3600 : : * The space estimates are exact, there are no unwritten extents,
3601 : : * hole punching doesn't need new metadata... This is needed especially
3602 : : * to keep ext2/3 backward compatibility.
3603 : : */
3604 [ + - ]: 207 : if (!ext4_has_feature_extents(sb))
3605 : 207 : return;
3606 : : /*
3607 : : * By default we reserve 2% or 4096 clusters, whichever is smaller.
3608 : : * This should cover the situations where we can not afford to run
3609 : : * out of space like for example punch hole, or converting
3610 : : * unwritten extents in delalloc path. In most cases such
3611 : : * allocation would require 1, or 2 blocks, higher numbers are
3612 : : * very rare.
3613 : : */
3614 : 207 : resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3615 : 207 : sbi->s_cluster_bits);
3616 : :
3617 : 207 : do_div(resv_clusters, 50);
3618 : 207 : resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3619 : :
3620 : 207 : atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3621 : : }
3622 : :
3623 : 207 : static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3624 : : {
3625 : : struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3626 : 207 : char *orig_data = kstrdup(data, GFP_KERNEL);
3627 : : struct buffer_head *bh, **group_desc;
3628 : : struct ext4_super_block *es = NULL;
3629 : 207 : struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3630 : : struct flex_groups **flex_groups;
3631 : : ext4_fsblk_t block;
3632 : 207 : ext4_fsblk_t sb_block = get_sb_block(&data);
3633 : : ext4_fsblk_t logical_sb_block;
3634 : : unsigned long offset = 0;
3635 : 207 : unsigned long journal_devnum = 0;
3636 : : unsigned long def_mount_opts;
3637 : : struct inode *root;
3638 : : const char *descr;
3639 : : int ret = -ENOMEM;
3640 : : int blocksize, clustersize;
3641 : : unsigned int db_count;
3642 : : unsigned int i;
3643 : : int needs_recovery, has_huge_files, has_bigalloc;
3644 : : __u64 blocks_count;
3645 : : int err = 0;
3646 : 207 : unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3647 : : ext4_group_t first_not_zeroed;
3648 : :
3649 [ - + # # : 207 : if ((data && !orig_data) || !sbi)
+ - ]
3650 : : goto out_free_base;
3651 : :
3652 : 207 : sbi->s_daxdev = dax_dev;
3653 : 207 : sbi->s_blockgroup_lock =
3654 : 207 : kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3655 [ + - ]: 207 : if (!sbi->s_blockgroup_lock)
3656 : : goto out_free_base;
3657 : :
3658 : 207 : sb->s_fs_info = sbi;
3659 : 207 : sbi->s_sb = sb;
3660 : 207 : sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3661 : 207 : sbi->s_sb_block = sb_block;
3662 [ + - ]: 207 : if (sb->s_bdev->bd_part)
3663 : 207 : sbi->s_sectors_written_start =
3664 [ + + ]: 828 : part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
3665 : :
3666 : : /* Cleanup superblock name */
3667 : 207 : strreplace(sb->s_id, '/', '!');
3668 : :
3669 : : /* -EINVAL is default */
3670 : : ret = -EINVAL;
3671 : 207 : blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3672 [ - + ]: 207 : if (!blocksize) {
3673 : 0 : ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3674 : 0 : goto out_fail;
3675 : : }
3676 : :
3677 : : /*
3678 : : * The ext4 superblock will not be buffer aligned for other than 1kB
3679 : : * block sizes. We need to calculate the offset from buffer start.
3680 : : */
3681 [ - + ]: 207 : if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3682 : 0 : logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3683 [ # # # # : 0 : offset = do_div(logical_sb_block, blocksize);
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
3684 : : } else {
3685 : 207 : logical_sb_block = sb_block;
3686 : : }
3687 : :
3688 [ - + ]: 414 : if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3689 : 0 : ext4_msg(sb, KERN_ERR, "unable to read superblock");
3690 : 0 : goto out_fail;
3691 : : }
3692 : : /*
3693 : : * Note: s_es must be initialized as soon as possible because
3694 : : * some ext4 macro-instructions depend on its value
3695 : : */
3696 : 207 : es = (struct ext4_super_block *) (bh->b_data + offset);
3697 : 207 : sbi->s_es = es;
3698 : 207 : sb->s_magic = le16_to_cpu(es->s_magic);
3699 [ + - ]: 207 : if (sb->s_magic != EXT4_SUPER_MAGIC)
3700 : : goto cantfind_ext4;
3701 : 207 : sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3702 : :
3703 : : /* Warn if metadata_csum and gdt_csum are both set. */
3704 [ - + # # ]: 207 : if (ext4_has_feature_metadata_csum(sb) &&
3705 : : ext4_has_feature_gdt_csum(sb))
3706 : 0 : ext4_warning(sb, "metadata_csum and uninit_bg are "
3707 : : "redundant flags; please run fsck.");
3708 : :
3709 : : /* Check for a known checksum algorithm */
3710 [ - + ]: 207 : if (!ext4_verify_csum_type(sb, es)) {
3711 : 0 : ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3712 : : "unknown checksum algorithm.");
3713 : : silent = 1;
3714 : 0 : goto cantfind_ext4;
3715 : : }
3716 : :
3717 : : /* Load the checksum driver */
3718 : 207 : sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3719 [ - + ]: 207 : if (IS_ERR(sbi->s_chksum_driver)) {
3720 : 0 : ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3721 : 0 : ret = PTR_ERR(sbi->s_chksum_driver);
3722 : 0 : sbi->s_chksum_driver = NULL;
3723 : 0 : goto failed_mount;
3724 : : }
3725 : :
3726 : : /* Check superblock checksum */
3727 [ - + ]: 207 : if (!ext4_superblock_csum_verify(sb, es)) {
3728 : 0 : ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3729 : : "invalid superblock checksum. Run e2fsck?");
3730 : : silent = 1;
3731 : : ret = -EFSBADCRC;
3732 : 0 : goto cantfind_ext4;
3733 : : }
3734 : :
3735 : : /* Precompute checksum seed for all metadata */
3736 [ - + ]: 207 : if (ext4_has_feature_csum_seed(sb))
3737 : 0 : sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3738 [ + - - + ]: 414 : else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3739 : 0 : sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3740 : : sizeof(es->s_uuid));
3741 : :
3742 : : /* Set defaults before we parse the mount options */
3743 : 207 : def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3744 : 207 : set_opt(sb, INIT_INODE_TABLE);
3745 [ - + ]: 207 : if (def_mount_opts & EXT4_DEFM_DEBUG)
3746 : 0 : set_opt(sb, DEBUG);
3747 [ - + ]: 207 : if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3748 : 0 : set_opt(sb, GRPID);
3749 [ - + ]: 207 : if (def_mount_opts & EXT4_DEFM_UID16)
3750 : 0 : set_opt(sb, NO_UID32);
3751 : : /* xattr user namespace & acls are now defaulted on */
3752 : 207 : set_opt(sb, XATTR_USER);
3753 : : #ifdef CONFIG_EXT4_FS_POSIX_ACL
3754 : 207 : set_opt(sb, POSIX_ACL);
3755 : : #endif
3756 : : /* don't forget to enable journal_csum when metadata_csum is enabled. */
3757 [ - + ]: 207 : if (ext4_has_metadata_csum(sb))
3758 : 0 : set_opt(sb, JOURNAL_CHECKSUM);
3759 : :
3760 [ - + ]: 207 : if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3761 : 0 : set_opt(sb, JOURNAL_DATA);
3762 [ - + ]: 207 : else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3763 : 0 : set_opt(sb, ORDERED_DATA);
3764 [ - + ]: 207 : else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3765 : 0 : set_opt(sb, WRITEBACK_DATA);
3766 : :
3767 [ - + ]: 207 : if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3768 : 0 : set_opt(sb, ERRORS_PANIC);
3769 [ + - ]: 207 : else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3770 : 207 : set_opt(sb, ERRORS_CONT);
3771 : : else
3772 : 0 : set_opt(sb, ERRORS_RO);
3773 : : /* block_validity enabled by default; disable with noblock_validity */
3774 : 207 : set_opt(sb, BLOCK_VALIDITY);
3775 [ - + ]: 207 : if (def_mount_opts & EXT4_DEFM_DISCARD)
3776 : 0 : set_opt(sb, DISCARD);
3777 : :
3778 : 207 : sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3779 : 207 : sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3780 : 207 : sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3781 : 207 : sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3782 : 207 : sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3783 : :
3784 [ + - ]: 207 : if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3785 : 207 : set_opt(sb, BARRIER);
3786 : :
3787 : : /*
3788 : : * enable delayed allocation by default
3789 : : * Use -o nodelalloc to turn it off
3790 : : */
3791 [ + - + - : 414 : if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
+ - ]
3792 : 207 : ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3793 : 207 : set_opt(sb, DELALLOC);
3794 : :
3795 : : /*
3796 : : * set default s_li_wait_mult for lazyinit, for the case there is
3797 : : * no mount option specified.
3798 : : */
3799 : 207 : sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3800 : :
3801 : 207 : blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3802 [ - + ]: 207 : if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3803 : : blocksize > EXT4_MAX_BLOCK_SIZE) {
3804 : 0 : ext4_msg(sb, KERN_ERR,
3805 : : "Unsupported filesystem blocksize %d (%d log_block_size)",
3806 : : blocksize, le32_to_cpu(es->s_log_block_size));
3807 : 0 : goto failed_mount;
3808 : : }
3809 : :
3810 [ - + ]: 207 : if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3811 : 0 : sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3812 : 0 : sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3813 : : } else {
3814 : 207 : sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3815 : 207 : sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3816 [ - + ]: 207 : if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3817 : 0 : ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3818 : : sbi->s_first_ino);
3819 : 0 : goto failed_mount;
3820 : : }
3821 [ + - + - ]: 414 : if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3822 [ - + ]: 414 : (!is_power_of_2(sbi->s_inode_size)) ||
3823 : : (sbi->s_inode_size > blocksize)) {
3824 : 0 : ext4_msg(sb, KERN_ERR,
3825 : : "unsupported inode size: %d",
3826 : : sbi->s_inode_size);
3827 : 0 : ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
3828 : 0 : goto failed_mount;
3829 : : }
3830 : : /*
3831 : : * i_atime_extra is the last extra field available for
3832 : : * [acm]times in struct ext4_inode. Checking for that
3833 : : * field should suffice to ensure we have extra space
3834 : : * for all three.
3835 : : */
3836 [ + - ]: 207 : if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
3837 : : sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
3838 : 207 : sb->s_time_gran = 1;
3839 : 207 : sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
3840 : : } else {
3841 : 0 : sb->s_time_gran = NSEC_PER_SEC;
3842 : 0 : sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
3843 : : }
3844 : 207 : sb->s_time_min = EXT4_TIMESTAMP_MIN;
3845 : : }
3846 [ + - ]: 207 : if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3847 : 207 : sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3848 : : EXT4_GOOD_OLD_INODE_SIZE;
3849 [ + - ]: 207 : if (ext4_has_feature_extra_isize(sb)) {
3850 : 207 : unsigned v, max = (sbi->s_inode_size -
3851 : : EXT4_GOOD_OLD_INODE_SIZE);
3852 : :
3853 : 207 : v = le16_to_cpu(es->s_want_extra_isize);
3854 [ - + ]: 207 : if (v > max) {
3855 : 0 : ext4_msg(sb, KERN_ERR,
3856 : : "bad s_want_extra_isize: %d", v);
3857 : 0 : goto failed_mount;
3858 : : }
3859 [ - + ]: 207 : if (sbi->s_want_extra_isize < v)
3860 : 0 : sbi->s_want_extra_isize = v;
3861 : :
3862 : 207 : v = le16_to_cpu(es->s_min_extra_isize);
3863 [ - + ]: 207 : if (v > max) {
3864 : 0 : ext4_msg(sb, KERN_ERR,
3865 : : "bad s_min_extra_isize: %d", v);
3866 : 0 : goto failed_mount;
3867 : : }
3868 [ - + ]: 207 : if (sbi->s_want_extra_isize < v)
3869 : 0 : sbi->s_want_extra_isize = v;
3870 : : }
3871 : : }
3872 : :
3873 [ - + ]: 207 : if (sbi->s_es->s_mount_opts[0]) {
3874 : 0 : char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3875 : : sizeof(sbi->s_es->s_mount_opts),
3876 : : GFP_KERNEL);
3877 [ # # ]: 0 : if (!s_mount_opts)
3878 : : goto failed_mount;
3879 [ # # ]: 0 : if (!parse_options(s_mount_opts, sb, &journal_devnum,
3880 : : &journal_ioprio, 0)) {
3881 : 0 : ext4_msg(sb, KERN_WARNING,
3882 : : "failed to parse options in superblock: %s",
3883 : : s_mount_opts);
3884 : : }
3885 : 0 : kfree(s_mount_opts);
3886 : : }
3887 : 207 : sbi->s_def_mount_opt = sbi->s_mount_opt;
3888 [ + - ]: 207 : if (!parse_options((char *) data, sb, &journal_devnum,
3889 : : &journal_ioprio, 0))
3890 : : goto failed_mount;
3891 : :
3892 : : #ifdef CONFIG_UNICODE
3893 : : if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3894 : : const struct ext4_sb_encodings *encoding_info;
3895 : : struct unicode_map *encoding;
3896 : : __u16 encoding_flags;
3897 : :
3898 : : if (ext4_has_feature_encrypt(sb)) {
3899 : : ext4_msg(sb, KERN_ERR,
3900 : : "Can't mount with encoding and encryption");
3901 : : goto failed_mount;
3902 : : }
3903 : :
3904 : : if (ext4_sb_read_encoding(es, &encoding_info,
3905 : : &encoding_flags)) {
3906 : : ext4_msg(sb, KERN_ERR,
3907 : : "Encoding requested by superblock is unknown");
3908 : : goto failed_mount;
3909 : : }
3910 : :
3911 : : encoding = utf8_load(encoding_info->version);
3912 : : if (IS_ERR(encoding)) {
3913 : : ext4_msg(sb, KERN_ERR,
3914 : : "can't mount with superblock charset: %s-%s "
3915 : : "not supported by the kernel. flags: 0x%x.",
3916 : : encoding_info->name, encoding_info->version,
3917 : : encoding_flags);
3918 : : goto failed_mount;
3919 : : }
3920 : : ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
3921 : : "%s-%s with flags 0x%hx", encoding_info->name,
3922 : : encoding_info->version?:"\b", encoding_flags);
3923 : :
3924 : : sbi->s_encoding = encoding;
3925 : : sbi->s_encoding_flags = encoding_flags;
3926 : : }
3927 : : #endif
3928 : :
3929 [ - + ]: 207 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3930 [ # # ]: 0 : printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3931 : : "with data=journal disables delayed "
3932 : : "allocation and O_DIRECT support!\n");
3933 [ # # ]: 0 : if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3934 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
3935 : : "both data=journal and delalloc");
3936 : 0 : goto failed_mount;
3937 : : }
3938 [ # # ]: 0 : if (test_opt(sb, DIOREAD_NOLOCK)) {
3939 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
3940 : : "both data=journal and dioread_nolock");
3941 : 0 : goto failed_mount;
3942 : : }
3943 : : if (test_opt(sb, DAX)) {
3944 : : ext4_msg(sb, KERN_ERR, "can't mount with "
3945 : : "both data=journal and dax");
3946 : : goto failed_mount;
3947 : : }
3948 [ # # ]: 0 : if (ext4_has_feature_encrypt(sb)) {
3949 : 0 : ext4_msg(sb, KERN_WARNING,
3950 : : "encrypted files will use data=ordered "
3951 : : "instead of data journaling mode");
3952 : : }
3953 [ # # ]: 0 : if (test_opt(sb, DELALLOC))
3954 : 0 : clear_opt(sb, DELALLOC);
3955 : : } else {
3956 : 207 : sb->s_iflags |= SB_I_CGROUPWB;
3957 : : }
3958 : :
3959 [ - + ]: 414 : sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3960 : 207 : (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
3961 : :
3962 [ - + # # ]: 207 : if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3963 [ # # ]: 0 : (ext4_has_compat_features(sb) ||
3964 [ # # ]: 0 : ext4_has_ro_compat_features(sb) ||
3965 : : ext4_has_incompat_features(sb)))
3966 : 0 : ext4_msg(sb, KERN_WARNING,
3967 : : "feature flags set on rev 0 fs, "
3968 : : "running e2fsck is recommended");
3969 : :
3970 [ - + ]: 207 : if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3971 : 0 : set_opt2(sb, HURD_COMPAT);
3972 [ # # ]: 0 : if (ext4_has_feature_64bit(sb)) {
3973 : 0 : ext4_msg(sb, KERN_ERR,
3974 : : "The Hurd can't support 64-bit file systems");
3975 : 0 : goto failed_mount;
3976 : : }
3977 : :
3978 : : /*
3979 : : * ea_inode feature uses l_i_version field which is not
3980 : : * available in HURD_COMPAT mode.
3981 : : */
3982 [ # # ]: 0 : if (ext4_has_feature_ea_inode(sb)) {
3983 : 0 : ext4_msg(sb, KERN_ERR,
3984 : : "ea_inode feature is not supported for Hurd");
3985 : 0 : goto failed_mount;
3986 : : }
3987 : : }
3988 : :
3989 [ - + ]: 207 : if (IS_EXT2_SB(sb)) {
3990 [ # # ]: 0 : if (ext2_feature_set_ok(sb))
3991 : 0 : ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3992 : : "using the ext4 subsystem");
3993 : : else {
3994 : : /*
3995 : : * If we're probing be silent, if this looks like
3996 : : * it's actually an ext[34] filesystem.
3997 : : */
3998 [ # # # # ]: 0 : if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3999 : : goto failed_mount;
4000 : 0 : ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4001 : : "to feature incompatibilities");
4002 : 0 : goto failed_mount;
4003 : : }
4004 : : }
4005 : :
4006 [ - + ]: 207 : if (IS_EXT3_SB(sb)) {
4007 [ # # ]: 0 : if (ext3_feature_set_ok(sb))
4008 : 0 : ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4009 : : "using the ext4 subsystem");
4010 : : else {
4011 : : /*
4012 : : * If we're probing be silent, if this looks like
4013 : : * it's actually an ext4 filesystem.
4014 : : */
4015 [ # # # # ]: 0 : if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4016 : : goto failed_mount;
4017 : 0 : ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4018 : : "to feature incompatibilities");
4019 : 0 : goto failed_mount;
4020 : : }
4021 : : }
4022 : :
4023 : : /*
4024 : : * Check feature flags regardless of the revision level, since we
4025 : : * previously didn't change the revision level when setting the flags,
4026 : : * so there is a chance incompat flags are set on a rev 0 filesystem.
4027 : : */
4028 [ + - ]: 207 : if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4029 : : goto failed_mount;
4030 : :
4031 [ - + ]: 207 : if (le32_to_cpu(es->s_log_block_size) >
4032 : : (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4033 : 0 : ext4_msg(sb, KERN_ERR,
4034 : : "Invalid log block size: %u",
4035 : : le32_to_cpu(es->s_log_block_size));
4036 : 0 : goto failed_mount;
4037 : : }
4038 [ - + ]: 207 : if (le32_to_cpu(es->s_log_cluster_size) >
4039 : : (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4040 : 0 : ext4_msg(sb, KERN_ERR,
4041 : : "Invalid log cluster size: %u",
4042 : : le32_to_cpu(es->s_log_cluster_size));
4043 : 0 : goto failed_mount;
4044 : : }
4045 : :
4046 [ - + ]: 207 : if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4047 : 0 : ext4_msg(sb, KERN_ERR,
4048 : : "Number of reserved GDT blocks insanely large: %d",
4049 : : le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4050 : 0 : goto failed_mount;
4051 : : }
4052 : :
4053 : : if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
4054 : : if (ext4_has_feature_inline_data(sb)) {
4055 : : ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4056 : : " that may contain inline data");
4057 : : goto failed_mount;
4058 : : }
4059 : : if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
4060 : : ext4_msg(sb, KERN_ERR,
4061 : : "DAX unsupported by block device.");
4062 : : goto failed_mount;
4063 : : }
4064 : : }
4065 : :
4066 [ - + # # ]: 207 : if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4067 : 0 : ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4068 : : es->s_encryption_level);
4069 : 0 : goto failed_mount;
4070 : : }
4071 : :
4072 [ + - ]: 207 : if (sb->s_blocksize != blocksize) {
4073 : : /* Validate the filesystem blocksize */
4074 [ - + ]: 207 : if (!sb_set_blocksize(sb, blocksize)) {
4075 : 0 : ext4_msg(sb, KERN_ERR, "bad block size %d",
4076 : : blocksize);
4077 : 0 : goto failed_mount;
4078 : : }
4079 : :
4080 : : brelse(bh);
4081 : 207 : logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4082 [ - + # # : 207 : offset = do_div(logical_sb_block, blocksize);
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # - +
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
+ - ]
4083 : 207 : bh = sb_bread_unmovable(sb, logical_sb_block);
4084 [ - + ]: 207 : if (!bh) {
4085 : 0 : ext4_msg(sb, KERN_ERR,
4086 : : "Can't read superblock on 2nd try");
4087 : 0 : goto failed_mount;
4088 : : }
4089 : 207 : es = (struct ext4_super_block *)(bh->b_data + offset);
4090 : 207 : sbi->s_es = es;
4091 [ - + ]: 207 : if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
4092 : 0 : ext4_msg(sb, KERN_ERR,
4093 : : "Magic mismatch, very weird!");
4094 : 0 : goto failed_mount;
4095 : : }
4096 : : }
4097 : :
4098 : 207 : has_huge_files = ext4_has_feature_huge_file(sb);
4099 : 207 : sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4100 : : has_huge_files);
4101 : 414 : sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
4102 : :
4103 : 207 : sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
4104 [ - + ]: 207 : if (ext4_has_feature_64bit(sb)) {
4105 [ # # ]: 0 : if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
4106 [ # # ]: 0 : sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
4107 : : !is_power_of_2(sbi->s_desc_size)) {
4108 : 0 : ext4_msg(sb, KERN_ERR,
4109 : : "unsupported descriptor size %lu",
4110 : : sbi->s_desc_size);
4111 : 0 : goto failed_mount;
4112 : : }
4113 : : } else
4114 : 207 : sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
4115 : :
4116 : 207 : sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
4117 : 207 : sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
4118 : :
4119 : 207 : sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
4120 [ + - ]: 207 : if (sbi->s_inodes_per_block == 0)
4121 : : goto cantfind_ext4;
4122 [ + - - + ]: 414 : if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4123 : 207 : sbi->s_inodes_per_group > blocksize * 8) {
4124 : 0 : ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4125 : : sbi->s_inodes_per_group);
4126 : 0 : goto failed_mount;
4127 : : }
4128 : 207 : sbi->s_itb_per_group = sbi->s_inodes_per_group /
4129 : : sbi->s_inodes_per_block;
4130 : 207 : sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
4131 : 207 : sbi->s_sbh = bh;
4132 : 207 : sbi->s_mount_state = le16_to_cpu(es->s_state);
4133 [ - + # # : 414 : sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # ]
4134 : 414 : sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
4135 : :
4136 [ + + ]: 1035 : for (i = 0; i < 4; i++)
4137 : 828 : sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4138 : 207 : sbi->s_def_hash_version = es->s_def_hash_version;
4139 [ + - ]: 207 : if (ext4_has_feature_dir_index(sb)) {
4140 : 207 : i = le32_to_cpu(es->s_flags);
4141 [ + - ]: 207 : if (i & EXT2_FLAGS_UNSIGNED_HASH)
4142 : 207 : sbi->s_hash_unsigned = 3;
4143 [ # # ]: 0 : else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
4144 : : #ifdef __CHAR_UNSIGNED__
4145 [ # # ]: 0 : if (!sb_rdonly(sb))
4146 : 0 : es->s_flags |=
4147 : : cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4148 : 0 : sbi->s_hash_unsigned = 3;
4149 : : #else
4150 : : if (!sb_rdonly(sb))
4151 : : es->s_flags |=
4152 : : cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
4153 : : #endif
4154 : : }
4155 : : }
4156 : :
4157 : : /* Handle clustersize */
4158 : 207 : clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4159 : : has_bigalloc = ext4_has_feature_bigalloc(sb);
4160 [ - + ]: 207 : if (has_bigalloc) {
4161 [ # # ]: 0 : if (clustersize < blocksize) {
4162 : 0 : ext4_msg(sb, KERN_ERR,
4163 : : "cluster size (%d) smaller than "
4164 : : "block size (%d)", clustersize, blocksize);
4165 : 0 : goto failed_mount;
4166 : : }
4167 : 0 : sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4168 : 0 : le32_to_cpu(es->s_log_block_size);
4169 : 0 : sbi->s_clusters_per_group =
4170 : 0 : le32_to_cpu(es->s_clusters_per_group);
4171 [ # # ]: 0 : if (sbi->s_clusters_per_group > blocksize * 8) {
4172 : 0 : ext4_msg(sb, KERN_ERR,
4173 : : "#clusters per group too big: %lu",
4174 : : sbi->s_clusters_per_group);
4175 : 0 : goto failed_mount;
4176 : : }
4177 [ # # ]: 0 : if (sbi->s_blocks_per_group !=
4178 : 0 : (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4179 : 0 : ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4180 : : "clusters per group (%lu) inconsistent",
4181 : : sbi->s_blocks_per_group,
4182 : : sbi->s_clusters_per_group);
4183 : 0 : goto failed_mount;
4184 : : }
4185 : : } else {
4186 [ - + ]: 207 : if (clustersize != blocksize) {
4187 : 0 : ext4_msg(sb, KERN_ERR,
4188 : : "fragment/cluster size (%d) != "
4189 : : "block size (%d)", clustersize, blocksize);
4190 : 0 : goto failed_mount;
4191 : : }
4192 [ - + ]: 207 : if (sbi->s_blocks_per_group > blocksize * 8) {
4193 : 0 : ext4_msg(sb, KERN_ERR,
4194 : : "#blocks per group too big: %lu",
4195 : : sbi->s_blocks_per_group);
4196 : 0 : goto failed_mount;
4197 : : }
4198 : 207 : sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4199 : 207 : sbi->s_cluster_bits = 0;
4200 : : }
4201 : 207 : sbi->s_cluster_ratio = clustersize / blocksize;
4202 : :
4203 : : /* Do we have standard group size of clustersize * 8 blocks ? */
4204 [ + - ]: 207 : if (sbi->s_blocks_per_group == clustersize << 3)
4205 : 207 : set_opt2(sb, STD_GROUP_SIZE);
4206 : :
4207 : : /*
4208 : : * Test whether we have more sectors than will fit in sector_t,
4209 : : * and whether the max offset is addressable by the page cache.
4210 : : */
4211 : 414 : err = generic_check_addressable(sb->s_blocksize_bits,
4212 : : ext4_blocks_count(es));
4213 [ - + ]: 207 : if (err) {
4214 : 0 : ext4_msg(sb, KERN_ERR, "filesystem"
4215 : : " too large to mount safely on this system");
4216 : 0 : goto failed_mount;
4217 : : }
4218 : :
4219 [ + - ]: 207 : if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4220 : : goto cantfind_ext4;
4221 : :
4222 : : /* check blocks count against device size */
4223 : 207 : blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4224 [ + - - + ]: 414 : if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4225 : 0 : ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4226 : : "exceeds size of device (%llu blocks)",
4227 : : ext4_blocks_count(es), blocks_count);
4228 : 0 : goto failed_mount;
4229 : : }
4230 : :
4231 : : /*
4232 : : * It makes no sense for the first data block to be beyond the end
4233 : : * of the filesystem.
4234 : : */
4235 [ - + ]: 414 : if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4236 : 0 : ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4237 : : "block %u is beyond end of filesystem (%llu)",
4238 : : le32_to_cpu(es->s_first_data_block),
4239 : : ext4_blocks_count(es));
4240 : 0 : goto failed_mount;
4241 : : }
4242 [ + - - + : 207 : if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
# # ]
4243 : 0 : (sbi->s_cluster_ratio == 1)) {
4244 : 0 : ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4245 : : "block is 0 with a 1k block and cluster size");
4246 : 0 : goto failed_mount;
4247 : : }
4248 : :
4249 : 414 : blocks_count = (ext4_blocks_count(es) -
4250 : 207 : le32_to_cpu(es->s_first_data_block) +
4251 : 207 : EXT4_BLOCKS_PER_GROUP(sb) - 1);
4252 [ - + # # : 207 : do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # - +
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
+ - ]
4253 [ - + ]: 207 : if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4254 : 0 : ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4255 : : "(block count %llu, first data block %u, "
4256 : : "blocks per group %lu)", blocks_count,
4257 : : ext4_blocks_count(es),
4258 : : le32_to_cpu(es->s_first_data_block),
4259 : : EXT4_BLOCKS_PER_GROUP(sb));
4260 : 0 : goto failed_mount;
4261 : : }
4262 : 207 : sbi->s_groups_count = blocks_count;
4263 : 207 : sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4264 : : (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4265 [ - + ]: 414 : if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4266 : 207 : le32_to_cpu(es->s_inodes_count)) {
4267 : 0 : ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4268 : : le32_to_cpu(es->s_inodes_count),
4269 : : ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4270 : : ret = -EINVAL;
4271 : 0 : goto failed_mount;
4272 : : }
4273 : 207 : db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4274 : : EXT4_DESC_PER_BLOCK(sb);
4275 [ - + ]: 207 : if (ext4_has_feature_meta_bg(sb)) {
4276 [ # # ]: 0 : if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4277 : 0 : ext4_msg(sb, KERN_WARNING,
4278 : : "first meta block group too large: %u "
4279 : : "(group descriptor block count %u)",
4280 : : le32_to_cpu(es->s_first_meta_bg), db_count);
4281 : 0 : goto failed_mount;
4282 : : }
4283 : : }
4284 : 207 : rcu_assign_pointer(sbi->s_group_desc,
4285 : : kvmalloc_array(db_count,
4286 : : sizeof(struct buffer_head *),
4287 : : GFP_KERNEL));
4288 [ - + ]: 207 : if (sbi->s_group_desc == NULL) {
4289 : 0 : ext4_msg(sb, KERN_ERR, "not enough memory");
4290 : : ret = -ENOMEM;
4291 : 0 : goto failed_mount;
4292 : : }
4293 : :
4294 : 207 : bgl_lock_init(sbi->s_blockgroup_lock);
4295 : :
4296 : : /* Pre-read the descriptors into the buffer cache */
4297 [ + + ]: 207 : for (i = 0; i < db_count; i++) {
4298 : 207 : block = descriptor_loc(sb, logical_sb_block, i);
4299 : : sb_breadahead_unmovable(sb, block);
4300 : : }
4301 : :
4302 [ + + ]: 207 : for (i = 0; i < db_count; i++) {
4303 : : struct buffer_head *bh;
4304 : :
4305 : 207 : block = descriptor_loc(sb, logical_sb_block, i);
4306 : : bh = sb_bread_unmovable(sb, block);
4307 [ - + ]: 207 : if (!bh) {
4308 : 0 : ext4_msg(sb, KERN_ERR,
4309 : : "can't read group descriptor %d", i);
4310 : 0 : db_count = i;
4311 : 0 : goto failed_mount2;
4312 : : }
4313 : : rcu_read_lock();
4314 : 207 : rcu_dereference(sbi->s_group_desc)[i] = bh;
4315 : : rcu_read_unlock();
4316 : : }
4317 : 207 : sbi->s_gdb_count = db_count;
4318 [ - + ]: 207 : if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4319 : 0 : ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4320 : : ret = -EFSCORRUPTED;
4321 : 0 : goto failed_mount2;
4322 : : }
4323 : :
4324 : 207 : timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4325 : :
4326 : : /* Register extent status tree shrinker */
4327 [ + - ]: 207 : if (ext4_es_register_shrinker(sbi))
4328 : : goto failed_mount3;
4329 : :
4330 : 207 : sbi->s_stripe = ext4_get_stripe_size(sbi);
4331 : 207 : sbi->s_extent_max_zeroout_kb = 32;
4332 : :
4333 : : /*
4334 : : * set up enough so that it can read an inode
4335 : : */
4336 : 207 : sb->s_op = &ext4_sops;
4337 : 207 : sb->s_export_op = &ext4_export_ops;
4338 : 207 : sb->s_xattr = ext4_xattr_handlers;
4339 : : #ifdef CONFIG_FS_ENCRYPTION
4340 : 207 : sb->s_cop = &ext4_cryptops;
4341 : : #endif
4342 : : #ifdef CONFIG_FS_VERITY
4343 : : sb->s_vop = &ext4_verityops;
4344 : : #endif
4345 : : #ifdef CONFIG_QUOTA
4346 : 207 : sb->dq_op = &ext4_quota_operations;
4347 [ - + ]: 207 : if (ext4_has_feature_quota(sb))
4348 : 0 : sb->s_qcop = &dquot_quotactl_sysfile_ops;
4349 : : else
4350 : 207 : sb->s_qcop = &ext4_qctl_operations;
4351 : 207 : sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4352 : : #endif
4353 : 207 : memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4354 : :
4355 : 207 : INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4356 : 207 : mutex_init(&sbi->s_orphan_lock);
4357 : :
4358 : 207 : sb->s_root = NULL;
4359 : :
4360 [ + - + - ]: 414 : needs_recovery = (es->s_last_orphan != 0 ||
4361 : : ext4_has_feature_journal_needs_recovery(sb));
4362 : :
4363 [ - + # # ]: 207 : if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4364 [ # # ]: 0 : if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4365 : : goto failed_mount3a;
4366 : :
4367 : : /*
4368 : : * The first inode we look at is the journal inode. Don't try
4369 : : * root first: it may be modified in the journal!
4370 : : */
4371 [ + - + - ]: 414 : if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4372 : 207 : err = ext4_load_journal(sb, es, journal_devnum);
4373 [ + - ]: 207 : if (err)
4374 : : goto failed_mount3a;
4375 [ # # # # : 0 : } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
# # ]
4376 : : ext4_has_feature_journal_needs_recovery(sb)) {
4377 : 0 : ext4_msg(sb, KERN_ERR, "required journal recovery "
4378 : : "suppressed and not mounted read-only");
4379 : 0 : goto failed_mount_wq;
4380 : : } else {
4381 : : /* Nojournal mode, all journal mount options are illegal */
4382 [ # # ]: 0 : if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4383 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4384 : : "journal_checksum, fs mounted w/o journal");
4385 : 0 : goto failed_mount_wq;
4386 : : }
4387 [ # # ]: 0 : if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4388 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4389 : : "journal_async_commit, fs mounted w/o journal");
4390 : 0 : goto failed_mount_wq;
4391 : : }
4392 [ # # ]: 0 : if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4393 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4394 : : "commit=%lu, fs mounted w/o journal",
4395 : : sbi->s_commit_interval / HZ);
4396 : 0 : goto failed_mount_wq;
4397 : : }
4398 [ # # ]: 0 : if (EXT4_MOUNT_DATA_FLAGS &
4399 : 0 : (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4400 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4401 : : "data=, fs mounted w/o journal");
4402 : 0 : goto failed_mount_wq;
4403 : : }
4404 : 0 : sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
4405 : 0 : clear_opt(sb, JOURNAL_CHECKSUM);
4406 : 0 : clear_opt(sb, DATA_FLAGS);
4407 : 0 : sbi->s_journal = NULL;
4408 : : needs_recovery = 0;
4409 : 0 : goto no_journal;
4410 : : }
4411 : :
4412 [ - + # # ]: 207 : if (ext4_has_feature_64bit(sb) &&
4413 : 0 : !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4414 : : JBD2_FEATURE_INCOMPAT_64BIT)) {
4415 : 0 : ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4416 : 0 : goto failed_mount_wq;
4417 : : }
4418 : :
4419 [ - + ]: 207 : if (!set_journal_csum_feature_set(sb)) {
4420 : 0 : ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4421 : : "feature set");
4422 : 0 : goto failed_mount_wq;
4423 : : }
4424 : :
4425 : : /* We have now updated the journal if required, so we can
4426 : : * validate the data journaling mode. */
4427 [ + - - ]: 207 : switch (test_opt(sb, DATA_FLAGS)) {
4428 : : case 0:
4429 : : /* No mode set, assume a default based on the journal
4430 : : * capabilities: ORDERED_DATA if the journal can
4431 : : * cope, else JOURNAL_DATA
4432 : : */
4433 [ + - ]: 207 : if (jbd2_journal_check_available_features
4434 : 207 : (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4435 : 207 : set_opt(sb, ORDERED_DATA);
4436 : 207 : sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4437 : : } else {
4438 : 0 : set_opt(sb, JOURNAL_DATA);
4439 : 0 : sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4440 : : }
4441 : : break;
4442 : :
4443 : : case EXT4_MOUNT_ORDERED_DATA:
4444 : : case EXT4_MOUNT_WRITEBACK_DATA:
4445 [ # # ]: 0 : if (!jbd2_journal_check_available_features
4446 : 0 : (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4447 : 0 : ext4_msg(sb, KERN_ERR, "Journal does not support "
4448 : : "requested data journaling mode");
4449 : 0 : goto failed_mount_wq;
4450 : : }
4451 : : default:
4452 : : break;
4453 : : }
4454 : :
4455 [ + - - + ]: 414 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4456 : 207 : test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4457 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4458 : : "journal_async_commit in data=ordered mode");
4459 : 0 : goto failed_mount_wq;
4460 : : }
4461 : :
4462 : 207 : set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4463 : :
4464 : 207 : sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4465 : :
4466 : : no_journal:
4467 [ + - ]: 207 : if (!test_opt(sb, NO_MBCACHE)) {
4468 : 207 : sbi->s_ea_block_cache = ext4_xattr_create_cache();
4469 [ - + ]: 207 : if (!sbi->s_ea_block_cache) {
4470 : 0 : ext4_msg(sb, KERN_ERR,
4471 : : "Failed to create ea_block_cache");
4472 : 0 : goto failed_mount_wq;
4473 : : }
4474 : :
4475 [ - + ]: 207 : if (ext4_has_feature_ea_inode(sb)) {
4476 : 0 : sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4477 [ # # ]: 0 : if (!sbi->s_ea_inode_cache) {
4478 : 0 : ext4_msg(sb, KERN_ERR,
4479 : : "Failed to create ea_inode_cache");
4480 : 0 : goto failed_mount_wq;
4481 : : }
4482 : : }
4483 : : }
4484 : :
4485 [ + - - + : 414 : if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
# # ]
4486 : : (blocksize != PAGE_SIZE)) {
4487 : 0 : ext4_msg(sb, KERN_ERR,
4488 : : "Unsupported blocksize for fs encryption");
4489 : 0 : goto failed_mount_wq;
4490 : : }
4491 : :
4492 [ - + # # ]: 207 : if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4493 : 0 : ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4494 : 0 : goto failed_mount_wq;
4495 : : }
4496 : :
4497 [ - + # # : 207 : if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
# # ]
4498 : : !ext4_has_feature_encrypt(sb)) {
4499 : : ext4_set_feature_encrypt(sb);
4500 : 0 : ext4_commit_super(sb, 1);
4501 : : }
4502 : :
4503 : : /*
4504 : : * Get the # of file system overhead blocks from the
4505 : : * superblock if present.
4506 : : */
4507 [ - + ]: 207 : if (es->s_overhead_clusters)
4508 : 0 : sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4509 : : else {
4510 : 207 : err = ext4_calculate_overhead(sb);
4511 [ + - ]: 207 : if (err)
4512 : : goto failed_mount_wq;
4513 : : }
4514 : :
4515 : : /*
4516 : : * The maximum number of concurrent works can be high and
4517 : : * concurrency isn't really necessary. Limit it to 1.
4518 : : */
4519 : 207 : EXT4_SB(sb)->rsv_conversion_wq =
4520 : 207 : alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4521 [ - + ]: 207 : if (!EXT4_SB(sb)->rsv_conversion_wq) {
4522 : 0 : printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4523 : : ret = -ENOMEM;
4524 : 0 : goto failed_mount4;
4525 : : }
4526 : :
4527 : : /*
4528 : : * The jbd2_journal_load will have done any necessary log recovery,
4529 : : * so we can safely mount the rest of the filesystem now.
4530 : : */
4531 : :
4532 : 207 : root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
4533 [ - + ]: 207 : if (IS_ERR(root)) {
4534 : 0 : ext4_msg(sb, KERN_ERR, "get root inode failed");
4535 : : ret = PTR_ERR(root);
4536 : : root = NULL;
4537 : 0 : goto failed_mount4;
4538 : : }
4539 [ + - + - : 207 : if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
- + ]
4540 : 0 : ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4541 : 0 : iput(root);
4542 : 0 : goto failed_mount4;
4543 : : }
4544 : :
4545 : : #ifdef CONFIG_UNICODE
4546 : : if (sbi->s_encoding)
4547 : : sb->s_d_op = &ext4_dentry_ops;
4548 : : #endif
4549 : :
4550 : 207 : sb->s_root = d_make_root(root);
4551 [ - + ]: 207 : if (!sb->s_root) {
4552 : 0 : ext4_msg(sb, KERN_ERR, "get root dentry failed");
4553 : : ret = -ENOMEM;
4554 : 0 : goto failed_mount4;
4555 : : }
4556 : :
4557 : 207 : ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4558 [ - + ]: 207 : if (ret == -EROFS) {
4559 : 0 : sb->s_flags |= SB_RDONLY;
4560 : : ret = 0;
4561 [ + - ]: 207 : } else if (ret)
4562 : : goto failed_mount4a;
4563 : :
4564 : 207 : ext4_set_resv_clusters(sb);
4565 : :
4566 : 207 : err = ext4_setup_system_zone(sb);
4567 [ - + ]: 207 : if (err) {
4568 : 0 : ext4_msg(sb, KERN_ERR, "failed to initialize system "
4569 : : "zone (%d)", err);
4570 : 0 : goto failed_mount4a;
4571 : : }
4572 : :
4573 : 207 : ext4_ext_init(sb);
4574 : 207 : err = ext4_mb_init(sb);
4575 [ - + ]: 207 : if (err) {
4576 : 0 : ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4577 : : err);
4578 : 0 : goto failed_mount5;
4579 : : }
4580 : :
4581 : 207 : block = ext4_count_free_clusters(sb);
4582 : 414 : ext4_free_blocks_count_set(sbi->s_es,
4583 : 207 : EXT4_C2B(sbi, block));
4584 : 207 : ext4_superblock_csum_set(sb);
4585 : 207 : err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4586 : : GFP_KERNEL);
4587 [ + - ]: 207 : if (!err) {
4588 : 207 : unsigned long freei = ext4_count_free_inodes(sb);
4589 : 207 : sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4590 : 207 : ext4_superblock_csum_set(sb);
4591 : 207 : err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4592 : : GFP_KERNEL);
4593 : : }
4594 [ + - ]: 207 : if (!err)
4595 : 207 : err = percpu_counter_init(&sbi->s_dirs_counter,
4596 : : ext4_count_dirs(sb), GFP_KERNEL);
4597 [ + - ]: 207 : if (!err)
4598 : 207 : err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4599 : : GFP_KERNEL);
4600 [ + - ]: 207 : if (!err)
4601 : 207 : err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
4602 : :
4603 [ - + ]: 207 : if (err) {
4604 : 0 : ext4_msg(sb, KERN_ERR, "insufficient memory");
4605 : 0 : goto failed_mount6;
4606 : : }
4607 : :
4608 [ + - ]: 207 : if (ext4_has_feature_flex_bg(sb))
4609 [ - + ]: 207 : if (!ext4_fill_flex_info(sb)) {
4610 : 0 : ext4_msg(sb, KERN_ERR,
4611 : : "unable to initialize "
4612 : : "flex_bg meta info!");
4613 : 0 : goto failed_mount6;
4614 : : }
4615 : :
4616 : 207 : err = ext4_register_li_request(sb, first_not_zeroed);
4617 [ + - ]: 207 : if (err)
4618 : : goto failed_mount6;
4619 : :
4620 : 207 : err = ext4_register_sysfs(sb);
4621 [ + - ]: 207 : if (err)
4622 : : goto failed_mount7;
4623 : :
4624 : : #ifdef CONFIG_QUOTA
4625 : : /* Enable quota usage during mount. */
4626 [ - + # # ]: 207 : if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4627 : 0 : err = ext4_enable_quotas(sb);
4628 [ # # ]: 0 : if (err)
4629 : : goto failed_mount8;
4630 : : }
4631 : : #endif /* CONFIG_QUOTA */
4632 : :
4633 : 207 : EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4634 : 207 : ext4_orphan_cleanup(sb, es);
4635 : 207 : EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4636 [ - + ]: 207 : if (needs_recovery) {
4637 : 0 : ext4_msg(sb, KERN_INFO, "recovery complete");
4638 : 0 : ext4_mark_recovery_complete(sb, es);
4639 : : }
4640 [ + - ]: 207 : if (EXT4_SB(sb)->s_journal) {
4641 [ + - ]: 207 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4642 : : descr = " journalled data mode";
4643 [ - + ]: 207 : else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4644 : : descr = " ordered data mode";
4645 : : else
4646 : : descr = " writeback data mode";
4647 : : } else
4648 : : descr = "out journal";
4649 : :
4650 [ - + ]: 207 : if (test_opt(sb, DISCARD)) {
4651 : 0 : struct request_queue *q = bdev_get_queue(sb->s_bdev);
4652 [ # # ]: 0 : if (!blk_queue_discard(q))
4653 : 0 : ext4_msg(sb, KERN_WARNING,
4654 : : "mounting with \"discard\" option, but "
4655 : : "the device does not support discard");
4656 : : }
4657 : :
4658 [ + - ]: 207 : if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4659 [ + - ]: 207 : ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4660 : : "Opts: %.*s%s%s", descr,
4661 : : (int) sizeof(sbi->s_es->s_mount_opts),
4662 : : sbi->s_es->s_mount_opts,
4663 : : *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4664 : :
4665 [ - + ]: 207 : if (es->s_error_count)
4666 : 0 : mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4667 : :
4668 : : /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4669 : 207 : ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4670 : 207 : ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4671 : 207 : ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4672 : :
4673 : 207 : kfree(orig_data);
4674 : 207 : return 0;
4675 : :
4676 : : cantfind_ext4:
4677 [ # # ]: 0 : if (!silent)
4678 : 0 : ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4679 : : goto failed_mount;
4680 : :
4681 : : #ifdef CONFIG_QUOTA
4682 : : failed_mount8:
4683 : 0 : ext4_unregister_sysfs(sb);
4684 : : #endif
4685 : : failed_mount7:
4686 : 0 : ext4_unregister_li_request(sb);
4687 : : failed_mount6:
4688 : 0 : ext4_mb_release(sb);
4689 : : rcu_read_lock();
4690 : 0 : flex_groups = rcu_dereference(sbi->s_flex_groups);
4691 [ # # ]: 0 : if (flex_groups) {
4692 [ # # ]: 0 : for (i = 0; i < sbi->s_flex_groups_allocated; i++)
4693 : 0 : kvfree(flex_groups[i]);
4694 : 0 : kvfree(flex_groups);
4695 : : }
4696 : : rcu_read_unlock();
4697 : 0 : percpu_counter_destroy(&sbi->s_freeclusters_counter);
4698 : 0 : percpu_counter_destroy(&sbi->s_freeinodes_counter);
4699 : 0 : percpu_counter_destroy(&sbi->s_dirs_counter);
4700 : 0 : percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4701 : 0 : percpu_free_rwsem(&sbi->s_writepages_rwsem);
4702 : : failed_mount5:
4703 : 0 : ext4_ext_release(sb);
4704 : 0 : ext4_release_system_zone(sb);
4705 : : failed_mount4a:
4706 : 0 : dput(sb->s_root);
4707 : 0 : sb->s_root = NULL;
4708 : : failed_mount4:
4709 : 0 : ext4_msg(sb, KERN_ERR, "mount failed");
4710 [ # # ]: 0 : if (EXT4_SB(sb)->rsv_conversion_wq)
4711 : 0 : destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4712 : : failed_mount_wq:
4713 : 0 : ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4714 : 0 : sbi->s_ea_inode_cache = NULL;
4715 : :
4716 : 0 : ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4717 : 0 : sbi->s_ea_block_cache = NULL;
4718 : :
4719 [ # # ]: 0 : if (sbi->s_journal) {
4720 : 0 : jbd2_journal_destroy(sbi->s_journal);
4721 : 0 : sbi->s_journal = NULL;
4722 : : }
4723 : : failed_mount3a:
4724 : 0 : ext4_es_unregister_shrinker(sbi);
4725 : : failed_mount3:
4726 : 0 : del_timer_sync(&sbi->s_err_report);
4727 [ # # ]: 0 : if (sbi->s_mmp_tsk)
4728 : 0 : kthread_stop(sbi->s_mmp_tsk);
4729 : : failed_mount2:
4730 : : rcu_read_lock();
4731 : 0 : group_desc = rcu_dereference(sbi->s_group_desc);
4732 [ # # ]: 0 : for (i = 0; i < db_count; i++)
4733 : 0 : brelse(group_desc[i]);
4734 : 0 : kvfree(group_desc);
4735 : : rcu_read_unlock();
4736 : : failed_mount:
4737 [ # # ]: 0 : if (sbi->s_chksum_driver)
4738 : : crypto_free_shash(sbi->s_chksum_driver);
4739 : :
4740 : : #ifdef CONFIG_UNICODE
4741 : : utf8_unload(sbi->s_encoding);
4742 : : #endif
4743 : :
4744 : : #ifdef CONFIG_QUOTA
4745 [ # # ]: 0 : for (i = 0; i < EXT4_MAXQUOTAS; i++)
4746 : 0 : kfree(get_qf_name(sb, sbi, i));
4747 : : #endif
4748 : : ext4_blkdev_remove(sbi);
4749 : : brelse(bh);
4750 : : out_fail:
4751 : 0 : sb->s_fs_info = NULL;
4752 : 0 : kfree(sbi->s_blockgroup_lock);
4753 : : out_free_base:
4754 : 0 : kfree(sbi);
4755 : 0 : kfree(orig_data);
4756 : : fs_put_dax(dax_dev);
4757 [ # # ]: 0 : return err ? err : ret;
4758 : : }
4759 : :
4760 : : /*
4761 : : * Setup any per-fs journal parameters now. We'll do this both on
4762 : : * initial mount, once the journal has been initialised but before we've
4763 : : * done any recovery; and again on any subsequent remount.
4764 : : */
4765 : 414 : static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4766 : : {
4767 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
4768 : :
4769 : 414 : journal->j_commit_interval = sbi->s_commit_interval;
4770 : 414 : journal->j_min_batch_time = sbi->s_min_batch_time;
4771 : 414 : journal->j_max_batch_time = sbi->s_max_batch_time;
4772 : :
4773 : 414 : write_lock(&journal->j_state_lock);
4774 [ + - ]: 414 : if (test_opt(sb, BARRIER))
4775 : 414 : journal->j_flags |= JBD2_BARRIER;
4776 : : else
4777 : 0 : journal->j_flags &= ~JBD2_BARRIER;
4778 [ - + ]: 414 : if (test_opt(sb, DATA_ERR_ABORT))
4779 : 0 : journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4780 : : else
4781 : 414 : journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4782 : : write_unlock(&journal->j_state_lock);
4783 : 414 : }
4784 : :
4785 : 207 : static struct inode *ext4_get_journal_inode(struct super_block *sb,
4786 : : unsigned int journal_inum)
4787 : : {
4788 : : struct inode *journal_inode;
4789 : :
4790 : : /*
4791 : : * Test for the existence of a valid inode on disk. Bad things
4792 : : * happen if we iget() an unused inode, as the subsequent iput()
4793 : : * will try to delete it.
4794 : : */
4795 : 207 : journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
4796 [ - + ]: 207 : if (IS_ERR(journal_inode)) {
4797 : 0 : ext4_msg(sb, KERN_ERR, "no journal found");
4798 : 0 : return NULL;
4799 : : }
4800 [ - + ]: 207 : if (!journal_inode->i_nlink) {
4801 : 0 : make_bad_inode(journal_inode);
4802 : 0 : iput(journal_inode);
4803 : 0 : ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4804 : 0 : return NULL;
4805 : : }
4806 : :
4807 : : jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4808 : : journal_inode, journal_inode->i_size);
4809 [ - + ]: 207 : if (!S_ISREG(journal_inode->i_mode)) {
4810 : 0 : ext4_msg(sb, KERN_ERR, "invalid journal inode");
4811 : 0 : iput(journal_inode);
4812 : 0 : return NULL;
4813 : : }
4814 : : return journal_inode;
4815 : : }
4816 : :
4817 : 207 : static journal_t *ext4_get_journal(struct super_block *sb,
4818 : : unsigned int journal_inum)
4819 : : {
4820 : : struct inode *journal_inode;
4821 : : journal_t *journal;
4822 : :
4823 [ - + ]: 207 : BUG_ON(!ext4_has_feature_journal(sb));
4824 : :
4825 : 207 : journal_inode = ext4_get_journal_inode(sb, journal_inum);
4826 [ + - ]: 207 : if (!journal_inode)
4827 : : return NULL;
4828 : :
4829 : 207 : journal = jbd2_journal_init_inode(journal_inode);
4830 [ - + ]: 207 : if (!journal) {
4831 : 0 : ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4832 : 0 : iput(journal_inode);
4833 : 0 : return NULL;
4834 : : }
4835 : 207 : journal->j_private = sb;
4836 : 207 : ext4_init_journal_params(sb, journal);
4837 : 207 : return journal;
4838 : : }
4839 : :
4840 : 0 : static journal_t *ext4_get_dev_journal(struct super_block *sb,
4841 : : dev_t j_dev)
4842 : : {
4843 : : struct buffer_head *bh;
4844 : : journal_t *journal;
4845 : : ext4_fsblk_t start;
4846 : : ext4_fsblk_t len;
4847 : : int hblock, blocksize;
4848 : : ext4_fsblk_t sb_block;
4849 : : unsigned long offset;
4850 : : struct ext4_super_block *es;
4851 : : struct block_device *bdev;
4852 : :
4853 [ # # ]: 0 : BUG_ON(!ext4_has_feature_journal(sb));
4854 : :
4855 : 0 : bdev = ext4_blkdev_get(j_dev, sb);
4856 [ # # ]: 0 : if (bdev == NULL)
4857 : : return NULL;
4858 : :
4859 : 0 : blocksize = sb->s_blocksize;
4860 : : hblock = bdev_logical_block_size(bdev);
4861 [ # # ]: 0 : if (blocksize < hblock) {
4862 : 0 : ext4_msg(sb, KERN_ERR,
4863 : : "blocksize too small for journal device");
4864 : 0 : goto out_bdev;
4865 : : }
4866 : :
4867 : 0 : sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4868 : 0 : offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4869 : 0 : set_blocksize(bdev, blocksize);
4870 [ # # ]: 0 : if (!(bh = __bread(bdev, sb_block, blocksize))) {
4871 : 0 : ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4872 : : "external journal");
4873 : 0 : goto out_bdev;
4874 : : }
4875 : :
4876 : 0 : es = (struct ext4_super_block *) (bh->b_data + offset);
4877 [ # # # # ]: 0 : if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4878 : 0 : !(le32_to_cpu(es->s_feature_incompat) &
4879 : : EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4880 : 0 : ext4_msg(sb, KERN_ERR, "external journal has "
4881 : : "bad superblock");
4882 : : brelse(bh);
4883 : : goto out_bdev;
4884 : : }
4885 : :
4886 [ # # ]: 0 : if ((le32_to_cpu(es->s_feature_ro_compat) &
4887 [ # # ]: 0 : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4888 : 0 : es->s_checksum != ext4_superblock_csum(sb, es)) {
4889 : 0 : ext4_msg(sb, KERN_ERR, "external journal has "
4890 : : "corrupt superblock");
4891 : : brelse(bh);
4892 : : goto out_bdev;
4893 : : }
4894 : :
4895 [ # # ]: 0 : if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4896 : 0 : ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4897 : : brelse(bh);
4898 : : goto out_bdev;
4899 : : }
4900 : :
4901 : : len = ext4_blocks_count(es);
4902 : 0 : start = sb_block + 1;
4903 : : brelse(bh); /* we're done with the superblock */
4904 : :
4905 : 0 : journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4906 : : start, len, blocksize);
4907 [ # # ]: 0 : if (!journal) {
4908 : 0 : ext4_msg(sb, KERN_ERR, "failed to create device journal");
4909 : 0 : goto out_bdev;
4910 : : }
4911 : 0 : journal->j_private = sb;
4912 : 0 : ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4913 : 0 : wait_on_buffer(journal->j_sb_buffer);
4914 [ # # ]: 0 : if (!buffer_uptodate(journal->j_sb_buffer)) {
4915 : 0 : ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4916 : 0 : goto out_journal;
4917 : : }
4918 [ # # ]: 0 : if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4919 : 0 : ext4_msg(sb, KERN_ERR, "External journal has more than one "
4920 : : "user (unsupported) - %d",
4921 : : be32_to_cpu(journal->j_superblock->s_nr_users));
4922 : 0 : goto out_journal;
4923 : : }
4924 : 0 : EXT4_SB(sb)->journal_bdev = bdev;
4925 : 0 : ext4_init_journal_params(sb, journal);
4926 : 0 : return journal;
4927 : :
4928 : : out_journal:
4929 : 0 : jbd2_journal_destroy(journal);
4930 : : out_bdev:
4931 : : ext4_blkdev_put(bdev);
4932 : 0 : return NULL;
4933 : : }
4934 : :
4935 : 207 : static int ext4_load_journal(struct super_block *sb,
4936 : : struct ext4_super_block *es,
4937 : : unsigned long journal_devnum)
4938 : : {
4939 : : journal_t *journal;
4940 : 207 : unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4941 : : dev_t journal_dev;
4942 : : int err = 0;
4943 : : int really_read_only;
4944 : :
4945 [ - + ]: 207 : BUG_ON(!ext4_has_feature_journal(sb));
4946 : :
4947 [ - + # # ]: 207 : if (journal_devnum &&
4948 : 0 : journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4949 : 0 : ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4950 : : "numbers have changed");
4951 : 0 : journal_dev = new_decode_dev(journal_devnum);
4952 : : } else
4953 : 207 : journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4954 : :
4955 : 207 : really_read_only = bdev_read_only(sb->s_bdev);
4956 : :
4957 : : /*
4958 : : * Are we loading a blank journal or performing recovery after a
4959 : : * crash? For recovery, we need to check in advance whether we
4960 : : * can get read-write access to the device.
4961 : : */
4962 [ - + ]: 207 : if (ext4_has_feature_journal_needs_recovery(sb)) {
4963 [ # # ]: 0 : if (sb_rdonly(sb)) {
4964 : 0 : ext4_msg(sb, KERN_INFO, "INFO: recovery "
4965 : : "required on readonly filesystem");
4966 [ # # ]: 0 : if (really_read_only) {
4967 : 0 : ext4_msg(sb, KERN_ERR, "write access "
4968 : : "unavailable, cannot proceed "
4969 : : "(try mounting with noload)");
4970 : 0 : return -EROFS;
4971 : : }
4972 : 0 : ext4_msg(sb, KERN_INFO, "write access will "
4973 : : "be enabled during recovery");
4974 : : }
4975 : : }
4976 : :
4977 [ - + ]: 207 : if (journal_inum && journal_dev) {
4978 : 0 : ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4979 : : "and inode journals!");
4980 : 0 : return -EINVAL;
4981 : : }
4982 : :
4983 [ + - ]: 207 : if (journal_inum) {
4984 [ + - ]: 207 : if (!(journal = ext4_get_journal(sb, journal_inum)))
4985 : : return -EINVAL;
4986 : : } else {
4987 [ # # ]: 0 : if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4988 : : return -EINVAL;
4989 : : }
4990 : :
4991 [ - + ]: 207 : if (!(journal->j_flags & JBD2_BARRIER))
4992 : 0 : ext4_msg(sb, KERN_INFO, "barriers disabled");
4993 : :
4994 [ + - ]: 207 : if (!ext4_has_feature_journal_needs_recovery(sb))
4995 : 207 : err = jbd2_journal_wipe(journal, !really_read_only);
4996 [ + - ]: 207 : if (!err) {
4997 : : char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4998 [ + - ]: 207 : if (save)
4999 : 207 : memcpy(save, ((char *) es) +
5000 : : EXT4_S_ERR_START, EXT4_S_ERR_LEN);
5001 : 207 : err = jbd2_journal_load(journal);
5002 [ + - ]: 207 : if (save)
5003 : 207 : memcpy(((char *) es) + EXT4_S_ERR_START,
5004 : : save, EXT4_S_ERR_LEN);
5005 : 207 : kfree(save);
5006 : : }
5007 : :
5008 [ - + ]: 207 : if (err) {
5009 : 0 : ext4_msg(sb, KERN_ERR, "error loading journal");
5010 : 0 : jbd2_journal_destroy(journal);
5011 : 0 : return err;
5012 : : }
5013 : :
5014 : 207 : EXT4_SB(sb)->s_journal = journal;
5015 : 207 : ext4_clear_journal_err(sb, es);
5016 : :
5017 [ - + # # ]: 207 : if (!really_read_only && journal_devnum &&
5018 : 0 : journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5019 : 0 : es->s_journal_dev = cpu_to_le32(journal_devnum);
5020 : :
5021 : : /* Make sure we flush the recovery flag to disk. */
5022 : 0 : ext4_commit_super(sb, 1);
5023 : : }
5024 : :
5025 : : return 0;
5026 : : }
5027 : :
5028 : 207 : static int ext4_commit_super(struct super_block *sb, int sync)
5029 : : {
5030 : 207 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
5031 : 207 : struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
5032 : : int error = 0;
5033 : :
5034 [ + - + - ]: 414 : if (!sbh || block_device_ejected(sb))
5035 : : return error;
5036 : :
5037 : : /*
5038 : : * The superblock bh should be mapped, but it might not be if the
5039 : : * device was hot-removed. Not much we can do but fail the I/O.
5040 : : */
5041 [ + - ]: 207 : if (!buffer_mapped(sbh))
5042 : : return error;
5043 : :
5044 : : /*
5045 : : * If the file system is mounted read-only, don't update the
5046 : : * superblock write time. This avoids updating the superblock
5047 : : * write time when we are mounting the root file system
5048 : : * read/only but we need to replay the journal; at that point,
5049 : : * for people who are east of GMT and who make their clock
5050 : : * tick in localtime for Windows bug-for-bug compatibility,
5051 : : * the clock is set in the future, and this will cause e2fsck
5052 : : * to complain and force a full file system check.
5053 : : */
5054 [ - + ]: 207 : if (!(sb->s_flags & SB_RDONLY))
5055 : : ext4_update_tstamp(es, s_wtime);
5056 [ + - ]: 207 : if (sb->s_bdev->bd_part)
5057 : 207 : es->s_kbytes_written =
5058 [ + + ]: 414 : cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
5059 : : ((part_stat_read(sb->s_bdev->bd_part,
5060 : : sectors[STAT_WRITE]) -
5061 : : EXT4_SB(sb)->s_sectors_written_start) >> 1));
5062 : : else
5063 : 0 : es->s_kbytes_written =
5064 : 0 : cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
5065 [ + - ]: 207 : if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5066 : 207 : ext4_free_blocks_count_set(es,
5067 : 414 : EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5068 : : &EXT4_SB(sb)->s_freeclusters_counter)));
5069 [ + - ]: 207 : if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5070 : 207 : es->s_free_inodes_count =
5071 : 414 : cpu_to_le32(percpu_counter_sum_positive(
5072 : : &EXT4_SB(sb)->s_freeinodes_counter));
5073 : : BUFFER_TRACE(sbh, "marking dirty");
5074 : 207 : ext4_superblock_csum_set(sb);
5075 [ + - ]: 207 : if (sync)
5076 : 207 : lock_buffer(sbh);
5077 [ + - - + ]: 414 : if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
5078 : : /*
5079 : : * Oh, dear. A previous attempt to write the
5080 : : * superblock failed. This could happen because the
5081 : : * USB device was yanked out. Or it could happen to
5082 : : * be a transient write error and maybe the block will
5083 : : * be remapped. Nothing we can do but to retry the
5084 : : * write and hope for the best.
5085 : : */
5086 : 0 : ext4_msg(sb, KERN_ERR, "previous I/O error to "
5087 : : "superblock detected");
5088 : : clear_buffer_write_io_error(sbh);
5089 : : set_buffer_uptodate(sbh);
5090 : : }
5091 : 207 : mark_buffer_dirty(sbh);
5092 [ + - ]: 207 : if (sync) {
5093 : 207 : unlock_buffer(sbh);
5094 : 207 : error = __sync_dirty_buffer(sbh,
5095 : 207 : REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5096 [ - + ]: 207 : if (buffer_write_io_error(sbh)) {
5097 : 0 : ext4_msg(sb, KERN_ERR, "I/O error while writing "
5098 : : "superblock");
5099 : : clear_buffer_write_io_error(sbh);
5100 : : set_buffer_uptodate(sbh);
5101 : : }
5102 : : }
5103 : 207 : return error;
5104 : : }
5105 : :
5106 : : /*
5107 : : * Have we just finished recovery? If so, and if we are mounting (or
5108 : : * remounting) the filesystem readonly, then we will end up with a
5109 : : * consistent fs on disk. Record that fact.
5110 : : */
5111 : 0 : static void ext4_mark_recovery_complete(struct super_block *sb,
5112 : : struct ext4_super_block *es)
5113 : : {
5114 : 0 : journal_t *journal = EXT4_SB(sb)->s_journal;
5115 : :
5116 [ # # ]: 0 : if (!ext4_has_feature_journal(sb)) {
5117 [ # # ]: 0 : BUG_ON(journal != NULL);
5118 : 0 : return;
5119 : : }
5120 : 0 : jbd2_journal_lock_updates(journal);
5121 [ # # ]: 0 : if (jbd2_journal_flush(journal) < 0)
5122 : : goto out;
5123 : :
5124 [ # # # # ]: 0 : if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
5125 : : ext4_clear_feature_journal_needs_recovery(sb);
5126 : 0 : ext4_commit_super(sb, 1);
5127 : : }
5128 : :
5129 : : out:
5130 : 0 : jbd2_journal_unlock_updates(journal);
5131 : : }
5132 : :
5133 : : /*
5134 : : * If we are mounting (or read-write remounting) a filesystem whose journal
5135 : : * has recorded an error from a previous lifetime, move that error to the
5136 : : * main filesystem now.
5137 : : */
5138 : 414 : static void ext4_clear_journal_err(struct super_block *sb,
5139 : : struct ext4_super_block *es)
5140 : : {
5141 : : journal_t *journal;
5142 : : int j_errno;
5143 : : const char *errstr;
5144 : :
5145 [ - + ]: 414 : BUG_ON(!ext4_has_feature_journal(sb));
5146 : :
5147 : 414 : journal = EXT4_SB(sb)->s_journal;
5148 : :
5149 : : /*
5150 : : * Now check for any error status which may have been recorded in the
5151 : : * journal by a prior ext4_error() or ext4_abort()
5152 : : */
5153 : :
5154 : 414 : j_errno = jbd2_journal_errno(journal);
5155 [ - + ]: 414 : if (j_errno) {
5156 : : char nbuf[16];
5157 : :
5158 : 0 : errstr = ext4_decode_error(sb, j_errno, nbuf);
5159 : 0 : ext4_warning(sb, "Filesystem error recorded "
5160 : : "from previous mount: %s", errstr);
5161 : 0 : ext4_warning(sb, "Marking fs in need of filesystem check.");
5162 : :
5163 : 0 : EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5164 : 0 : es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5165 : 0 : ext4_commit_super(sb, 1);
5166 : :
5167 : 0 : jbd2_journal_clear_err(journal);
5168 : 0 : jbd2_journal_update_sb_errno(journal);
5169 : : }
5170 : 414 : }
5171 : :
5172 : : /*
5173 : : * Force the running and committing transactions to commit,
5174 : : * and wait on the commit.
5175 : : */
5176 : 0 : int ext4_force_commit(struct super_block *sb)
5177 : : {
5178 : : journal_t *journal;
5179 : :
5180 [ # # ]: 0 : if (sb_rdonly(sb))
5181 : : return 0;
5182 : :
5183 : 0 : journal = EXT4_SB(sb)->s_journal;
5184 : 0 : return ext4_journal_force_commit(journal);
5185 : : }
5186 : :
5187 : 414 : static int ext4_sync_fs(struct super_block *sb, int wait)
5188 : : {
5189 : : int ret = 0;
5190 : : tid_t target;
5191 : : bool needs_barrier = false;
5192 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
5193 : :
5194 [ + - ]: 414 : if (unlikely(ext4_forced_shutdown(sbi)))
5195 : : return 0;
5196 : :
5197 : 414 : trace_ext4_sync_fs(sb, wait);
5198 : 414 : flush_workqueue(sbi->rsv_conversion_wq);
5199 : : /*
5200 : : * Writeback quota in non-journalled quota case - journalled quota has
5201 : : * no dirty dquots
5202 : : */
5203 : 414 : dquot_writeback_dquots(sb, -1);
5204 : : /*
5205 : : * Data writeback is possible w/o journal transaction, so barrier must
5206 : : * being sent at the end of the function. But we can skip it if
5207 : : * transaction_commit will do it for us.
5208 : : */
5209 [ + - ]: 414 : if (sbi->s_journal) {
5210 : 414 : target = jbd2_get_latest_transaction(sbi->s_journal);
5211 [ + + + - : 621 : if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
- + ]
5212 : 207 : !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5213 : : needs_barrier = true;
5214 : :
5215 [ + - ]: 414 : if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5216 [ + + ]: 414 : if (wait)
5217 : 207 : ret = jbd2_log_wait_commit(sbi->s_journal,
5218 : : target);
5219 : : }
5220 [ # # # # ]: 0 : } else if (wait && test_opt(sb, BARRIER))
5221 : : needs_barrier = true;
5222 [ - + ]: 414 : if (needs_barrier) {
5223 : : int err;
5224 : 0 : err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5225 [ # # ]: 0 : if (!ret)
5226 : : ret = err;
5227 : : }
5228 : :
5229 : 414 : return ret;
5230 : : }
5231 : :
5232 : : /*
5233 : : * LVM calls this function before a (read-only) snapshot is created. This
5234 : : * gives us a chance to flush the journal completely and mark the fs clean.
5235 : : *
5236 : : * Note that only this function cannot bring a filesystem to be in a clean
5237 : : * state independently. It relies on upper layer to stop all data & metadata
5238 : : * modifications.
5239 : : */
5240 : 0 : static int ext4_freeze(struct super_block *sb)
5241 : : {
5242 : : int error = 0;
5243 : : journal_t *journal;
5244 : :
5245 [ # # ]: 0 : if (sb_rdonly(sb))
5246 : : return 0;
5247 : :
5248 : 0 : journal = EXT4_SB(sb)->s_journal;
5249 : :
5250 [ # # ]: 0 : if (journal) {
5251 : : /* Now we set up the journal barrier. */
5252 : 0 : jbd2_journal_lock_updates(journal);
5253 : :
5254 : : /*
5255 : : * Don't clear the needs_recovery flag if we failed to
5256 : : * flush the journal.
5257 : : */
5258 : 0 : error = jbd2_journal_flush(journal);
5259 [ # # ]: 0 : if (error < 0)
5260 : : goto out;
5261 : :
5262 : : /* Journal blocked and flushed, clear needs_recovery flag. */
5263 : : ext4_clear_feature_journal_needs_recovery(sb);
5264 : : }
5265 : :
5266 : 0 : error = ext4_commit_super(sb, 1);
5267 : : out:
5268 [ # # ]: 0 : if (journal)
5269 : : /* we rely on upper layer to stop further updates */
5270 : 0 : jbd2_journal_unlock_updates(journal);
5271 : 0 : return error;
5272 : : }
5273 : :
5274 : : /*
5275 : : * Called by LVM after the snapshot is done. We need to reset the RECOVER
5276 : : * flag here, even though the filesystem is not technically dirty yet.
5277 : : */
5278 : 0 : static int ext4_unfreeze(struct super_block *sb)
5279 : : {
5280 [ # # # # ]: 0 : if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
5281 : : return 0;
5282 : :
5283 [ # # ]: 0 : if (EXT4_SB(sb)->s_journal) {
5284 : : /* Reset the needs_recovery flag before the fs is unlocked. */
5285 : : ext4_set_feature_journal_needs_recovery(sb);
5286 : : }
5287 : :
5288 : 0 : ext4_commit_super(sb, 1);
5289 : 0 : return 0;
5290 : : }
5291 : :
5292 : : /*
5293 : : * Structure to save mount options for ext4_remount's benefit
5294 : : */
5295 : : struct ext4_mount_options {
5296 : : unsigned long s_mount_opt;
5297 : : unsigned long s_mount_opt2;
5298 : : kuid_t s_resuid;
5299 : : kgid_t s_resgid;
5300 : : unsigned long s_commit_interval;
5301 : : u32 s_min_batch_time, s_max_batch_time;
5302 : : #ifdef CONFIG_QUOTA
5303 : : int s_jquota_fmt;
5304 : : char *s_qf_names[EXT4_MAXQUOTAS];
5305 : : #endif
5306 : : };
5307 : :
5308 : 207 : static int ext4_remount(struct super_block *sb, int *flags, char *data)
5309 : : {
5310 : : struct ext4_super_block *es;
5311 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
5312 : : unsigned long old_sb_flags;
5313 : : struct ext4_mount_options old_opts;
5314 : : int enable_quota = 0;
5315 : : ext4_group_t g;
5316 : 207 : unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5317 : : int err = 0;
5318 : : #ifdef CONFIG_QUOTA
5319 : : int i, j;
5320 : : char *to_free[EXT4_MAXQUOTAS];
5321 : : #endif
5322 : 207 : char *orig_data = kstrdup(data, GFP_KERNEL);
5323 : :
5324 [ + - ]: 207 : if (data && !orig_data)
5325 : : return -ENOMEM;
5326 : :
5327 : : /* Store the original options */
5328 : 207 : old_sb_flags = sb->s_flags;
5329 : 207 : old_opts.s_mount_opt = sbi->s_mount_opt;
5330 : 207 : old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5331 : 207 : old_opts.s_resuid = sbi->s_resuid;
5332 : 207 : old_opts.s_resgid = sbi->s_resgid;
5333 : 207 : old_opts.s_commit_interval = sbi->s_commit_interval;
5334 : 207 : old_opts.s_min_batch_time = sbi->s_min_batch_time;
5335 : 207 : old_opts.s_max_batch_time = sbi->s_max_batch_time;
5336 : : #ifdef CONFIG_QUOTA
5337 : 207 : old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5338 [ + + ]: 828 : for (i = 0; i < EXT4_MAXQUOTAS; i++)
5339 [ - + ]: 621 : if (sbi->s_qf_names[i]) {
5340 : : char *qf_name = get_qf_name(sb, sbi, i);
5341 : :
5342 : 0 : old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
5343 [ # # ]: 0 : if (!old_opts.s_qf_names[i]) {
5344 [ # # ]: 0 : for (j = 0; j < i; j++)
5345 : 0 : kfree(old_opts.s_qf_names[j]);
5346 : 0 : kfree(orig_data);
5347 : 0 : return -ENOMEM;
5348 : : }
5349 : : } else
5350 : 621 : old_opts.s_qf_names[i] = NULL;
5351 : : #endif
5352 [ + - + - ]: 207 : if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5353 : 207 : journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5354 : :
5355 [ + - ]: 207 : if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5356 : : err = -EINVAL;
5357 : : goto restore_opts;
5358 : : }
5359 : :
5360 [ - + ]: 207 : if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5361 : 207 : test_opt(sb, JOURNAL_CHECKSUM)) {
5362 : 0 : ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5363 : : "during remount not supported; ignoring");
5364 : 0 : sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5365 : : }
5366 : :
5367 [ - + ]: 207 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5368 [ # # ]: 0 : if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5369 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
5370 : : "both data=journal and delalloc");
5371 : : err = -EINVAL;
5372 : 0 : goto restore_opts;
5373 : : }
5374 [ # # ]: 0 : if (test_opt(sb, DIOREAD_NOLOCK)) {
5375 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
5376 : : "both data=journal and dioread_nolock");
5377 : : err = -EINVAL;
5378 : 0 : goto restore_opts;
5379 : : }
5380 [ + - ]: 207 : } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5381 [ - + ]: 207 : if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5382 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
5383 : : "journal_async_commit in data=ordered mode");
5384 : : err = -EINVAL;
5385 : 0 : goto restore_opts;
5386 : : }
5387 : : }
5388 : :
5389 [ - + ]: 207 : if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5390 : 0 : ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5391 : : err = -EINVAL;
5392 : 0 : goto restore_opts;
5393 : : }
5394 : :
5395 [ - + ]: 207 : if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5396 : 0 : ext4_abort(sb, "Abort forced by user");
5397 : :
5398 [ - + ]: 414 : sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5399 : 207 : (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5400 : :
5401 : 207 : es = sbi->s_es;
5402 : :
5403 [ + - ]: 207 : if (sbi->s_journal) {
5404 : 207 : ext4_init_journal_params(sb, sbi->s_journal);
5405 : 207 : set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5406 : : }
5407 : :
5408 [ - + ]: 207 : if (*flags & SB_LAZYTIME)
5409 : 0 : sb->s_flags |= SB_LAZYTIME;
5410 : :
5411 [ + - ]: 414 : if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5412 [ + - ]: 207 : if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5413 : : err = -EROFS;
5414 : : goto restore_opts;
5415 : : }
5416 : :
5417 [ - + ]: 207 : if (*flags & SB_RDONLY) {
5418 : 0 : err = sync_filesystem(sb);
5419 [ # # ]: 0 : if (err < 0)
5420 : : goto restore_opts;
5421 : : err = dquot_suspend(sb, -1);
5422 [ # # ]: 0 : if (err < 0)
5423 : : goto restore_opts;
5424 : :
5425 : : /*
5426 : : * First of all, the unconditional stuff we have to do
5427 : : * to disable replay of the journal when we next remount
5428 : : */
5429 : 0 : sb->s_flags |= SB_RDONLY;
5430 : :
5431 : : /*
5432 : : * OK, test if we are remounting a valid rw partition
5433 : : * readonly, and if so set the rdonly flag and then
5434 : : * mark the partition as valid again.
5435 : : */
5436 [ # # # # ]: 0 : if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5437 : 0 : (sbi->s_mount_state & EXT4_VALID_FS))
5438 : 0 : es->s_state = cpu_to_le16(sbi->s_mount_state);
5439 : :
5440 [ # # ]: 0 : if (sbi->s_journal)
5441 : 0 : ext4_mark_recovery_complete(sb, es);
5442 [ # # ]: 0 : if (sbi->s_mmp_tsk)
5443 : 0 : kthread_stop(sbi->s_mmp_tsk);
5444 : : } else {
5445 : : /* Make sure we can mount this feature set readwrite */
5446 [ + - + - ]: 414 : if (ext4_has_feature_readonly(sb) ||
5447 : 207 : !ext4_feature_set_ok(sb, 0)) {
5448 : : err = -EROFS;
5449 : : goto restore_opts;
5450 : : }
5451 : : /*
5452 : : * Make sure the group descriptor checksums
5453 : : * are sane. If they aren't, refuse to remount r/w.
5454 : : */
5455 [ + + ]: 10971 : for (g = 0; g < sbi->s_groups_count; g++) {
5456 : 10971 : struct ext4_group_desc *gdp =
5457 : : ext4_get_group_desc(sb, g, NULL);
5458 : :
5459 [ - + ]: 10971 : if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5460 : 0 : ext4_msg(sb, KERN_ERR,
5461 : : "ext4_remount: Checksum for group %u failed (%u!=%u)",
5462 : : g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5463 : : le16_to_cpu(gdp->bg_checksum));
5464 : : err = -EFSBADCRC;
5465 : 0 : goto restore_opts;
5466 : : }
5467 : : }
5468 : :
5469 : : /*
5470 : : * If we have an unprocessed orphan list hanging
5471 : : * around from a previously readonly bdev mount,
5472 : : * require a full umount/remount for now.
5473 : : */
5474 [ - + ]: 207 : if (es->s_last_orphan) {
5475 : 0 : ext4_msg(sb, KERN_WARNING, "Couldn't "
5476 : : "remount RDWR because of unprocessed "
5477 : : "orphan inode list. Please "
5478 : : "umount/remount instead");
5479 : : err = -EINVAL;
5480 : 0 : goto restore_opts;
5481 : : }
5482 : :
5483 : : /*
5484 : : * Mounting a RDONLY partition read-write, so reread
5485 : : * and store the current valid flag. (It may have
5486 : : * been changed by e2fsck since we originally mounted
5487 : : * the partition.)
5488 : : */
5489 [ + - ]: 207 : if (sbi->s_journal)
5490 : 207 : ext4_clear_journal_err(sb, es);
5491 : 207 : sbi->s_mount_state = le16_to_cpu(es->s_state);
5492 : :
5493 : 207 : err = ext4_setup_super(sb, es, 0);
5494 [ + - ]: 207 : if (err)
5495 : : goto restore_opts;
5496 : :
5497 : 207 : sb->s_flags &= ~SB_RDONLY;
5498 [ - + ]: 207 : if (ext4_has_feature_mmp(sb))
5499 [ # # ]: 0 : if (ext4_multi_mount_protect(sb,
5500 : : le64_to_cpu(es->s_mmp_block))) {
5501 : : err = -EROFS;
5502 : : goto restore_opts;
5503 : : }
5504 : : enable_quota = 1;
5505 : : }
5506 : : }
5507 : :
5508 : : /*
5509 : : * Reinitialize lazy itable initialization thread based on
5510 : : * current settings
5511 : : */
5512 [ + - - + ]: 414 : if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5513 : 0 : ext4_unregister_li_request(sb);
5514 : : else {
5515 : : ext4_group_t first_not_zeroed;
5516 : 207 : first_not_zeroed = ext4_has_uninit_itable(sb);
5517 : 207 : ext4_register_li_request(sb, first_not_zeroed);
5518 : : }
5519 : :
5520 : 207 : ext4_setup_system_zone(sb);
5521 [ - + # # ]: 207 : if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5522 : 0 : err = ext4_commit_super(sb, 1);
5523 [ # # ]: 0 : if (err)
5524 : : goto restore_opts;
5525 : : }
5526 : :
5527 : : #ifdef CONFIG_QUOTA
5528 : : /* Release old quota file names */
5529 [ + + ]: 621 : for (i = 0; i < EXT4_MAXQUOTAS; i++)
5530 : 621 : kfree(old_opts.s_qf_names[i]);
5531 [ + - ]: 207 : if (enable_quota) {
5532 [ - + ]: 207 : if (sb_any_quota_suspended(sb))
5533 : 0 : dquot_resume(sb, -1);
5534 [ - + ]: 207 : else if (ext4_has_feature_quota(sb)) {
5535 : 0 : err = ext4_enable_quotas(sb);
5536 [ # # ]: 0 : if (err)
5537 : : goto restore_opts;
5538 : : }
5539 : : }
5540 : : #endif
5541 : :
5542 : 207 : *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
5543 : 207 : ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5544 : 207 : kfree(orig_data);
5545 : 207 : return 0;
5546 : :
5547 : : restore_opts:
5548 : 0 : sb->s_flags = old_sb_flags;
5549 : 0 : sbi->s_mount_opt = old_opts.s_mount_opt;
5550 : 0 : sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5551 : 0 : sbi->s_resuid = old_opts.s_resuid;
5552 : 0 : sbi->s_resgid = old_opts.s_resgid;
5553 : 0 : sbi->s_commit_interval = old_opts.s_commit_interval;
5554 : 0 : sbi->s_min_batch_time = old_opts.s_min_batch_time;
5555 : 0 : sbi->s_max_batch_time = old_opts.s_max_batch_time;
5556 : : #ifdef CONFIG_QUOTA
5557 : 0 : sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5558 [ # # ]: 0 : for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5559 : 0 : to_free[i] = get_qf_name(sb, sbi, i);
5560 : 0 : rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
5561 : : }
5562 : 0 : synchronize_rcu();
5563 [ # # ]: 0 : for (i = 0; i < EXT4_MAXQUOTAS; i++)
5564 : 0 : kfree(to_free[i]);
5565 : : #endif
5566 : 0 : kfree(orig_data);
5567 : 0 : return err;
5568 : : }
5569 : :
5570 : : #ifdef CONFIG_QUOTA
5571 : 0 : static int ext4_statfs_project(struct super_block *sb,
5572 : : kprojid_t projid, struct kstatfs *buf)
5573 : : {
5574 : : struct kqid qid;
5575 : : struct dquot *dquot;
5576 : : u64 limit;
5577 : : u64 curblock;
5578 : :
5579 : : qid = make_kqid_projid(projid);
5580 : 0 : dquot = dqget(sb, qid);
5581 [ # # ]: 0 : if (IS_ERR(dquot))
5582 : 0 : return PTR_ERR(dquot);
5583 : : spin_lock(&dquot->dq_dqb_lock);
5584 : :
5585 : : limit = 0;
5586 [ # # ]: 0 : if (dquot->dq_dqb.dqb_bsoftlimit &&
5587 : : (!limit || dquot->dq_dqb.dqb_bsoftlimit < limit))
5588 : 0 : limit = dquot->dq_dqb.dqb_bsoftlimit;
5589 [ # # # # ]: 0 : if (dquot->dq_dqb.dqb_bhardlimit &&
5590 [ # # ]: 0 : (!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
5591 : 0 : limit = dquot->dq_dqb.dqb_bhardlimit;
5592 : 0 : limit >>= sb->s_blocksize_bits;
5593 : :
5594 [ # # # # ]: 0 : if (limit && buf->f_blocks > limit) {
5595 : 0 : curblock = (dquot->dq_dqb.dqb_curspace +
5596 : 0 : dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
5597 : 0 : buf->f_blocks = limit;
5598 : 0 : buf->f_bfree = buf->f_bavail =
5599 : : (buf->f_blocks > curblock) ?
5600 [ # # ]: 0 : (buf->f_blocks - curblock) : 0;
5601 : : }
5602 : :
5603 : : limit = 0;
5604 [ # # ]: 0 : if (dquot->dq_dqb.dqb_isoftlimit &&
5605 : : (!limit || dquot->dq_dqb.dqb_isoftlimit < limit))
5606 : 0 : limit = dquot->dq_dqb.dqb_isoftlimit;
5607 [ # # # # ]: 0 : if (dquot->dq_dqb.dqb_ihardlimit &&
5608 [ # # ]: 0 : (!limit || dquot->dq_dqb.dqb_ihardlimit < limit))
5609 : 0 : limit = dquot->dq_dqb.dqb_ihardlimit;
5610 : :
5611 [ # # # # ]: 0 : if (limit && buf->f_files > limit) {
5612 : 0 : buf->f_files = limit;
5613 : 0 : buf->f_ffree =
5614 : 0 : (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5615 [ # # ]: 0 : (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5616 : : }
5617 : :
5618 : : spin_unlock(&dquot->dq_dqb_lock);
5619 : 0 : dqput(dquot);
5620 : 0 : return 0;
5621 : : }
5622 : : #endif
5623 : :
5624 : 99604 : static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5625 : : {
5626 : 99604 : struct super_block *sb = dentry->d_sb;
5627 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
5628 : 99604 : struct ext4_super_block *es = sbi->s_es;
5629 : : ext4_fsblk_t overhead = 0, resv_blocks;
5630 : : u64 fsid;
5631 : : s64 bfree;
5632 : 199204 : resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5633 : :
5634 [ + - ]: 99600 : if (!test_opt(sb, MINIX_DF))
5635 : 99604 : overhead = sbi->s_overhead;
5636 : :
5637 : 99600 : buf->f_type = EXT4_SUPER_MAGIC;
5638 : 99600 : buf->f_bsize = sb->s_blocksize;
5639 : 99600 : buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5640 : 199205 : bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5641 : 99605 : percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5642 : : /* prevent underflow in case that few free space is available */
5643 : 99605 : buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5644 : 99605 : buf->f_bavail = buf->f_bfree -
5645 : 99605 : (ext4_r_blocks_count(es) + resv_blocks);
5646 [ - + ]: 99605 : if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5647 : 0 : buf->f_bavail = 0;
5648 : 99605 : buf->f_files = le32_to_cpu(es->s_inodes_count);
5649 : 199210 : buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5650 : 99605 : buf->f_namelen = EXT4_NAME_LEN;
5651 : 99605 : fsid = le64_to_cpup((void *)es->s_uuid) ^
5652 : : le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5653 : 99605 : buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5654 : 99605 : buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5655 : :
5656 : : #ifdef CONFIG_QUOTA
5657 [ - + # # ]: 199210 : if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5658 : : sb_has_quota_limits_enabled(sb, PRJQUOTA))
5659 : 0 : ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5660 : : #endif
5661 : 99605 : return 0;
5662 : : }
5663 : :
5664 : :
5665 : : #ifdef CONFIG_QUOTA
5666 : :
5667 : : /*
5668 : : * Helper functions so that transaction is started before we acquire dqio_sem
5669 : : * to keep correct lock ordering of transaction > dqio_sem
5670 : : */
5671 : : static inline struct inode *dquot_to_inode(struct dquot *dquot)
5672 : : {
5673 : 0 : return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5674 : : }
5675 : :
5676 : 0 : static int ext4_write_dquot(struct dquot *dquot)
5677 : : {
5678 : : int ret, err;
5679 : : handle_t *handle;
5680 : : struct inode *inode;
5681 : :
5682 : : inode = dquot_to_inode(dquot);
5683 [ # # # # ]: 0 : handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5684 : : EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5685 [ # # ]: 0 : if (IS_ERR(handle))
5686 : 0 : return PTR_ERR(handle);
5687 : 0 : ret = dquot_commit(dquot);
5688 : 0 : err = ext4_journal_stop(handle);
5689 [ # # ]: 0 : if (!ret)
5690 : : ret = err;
5691 : 0 : return ret;
5692 : : }
5693 : :
5694 : 0 : static int ext4_acquire_dquot(struct dquot *dquot)
5695 : : {
5696 : : int ret, err;
5697 : : handle_t *handle;
5698 : :
5699 [ # # # # : 0 : handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
# # ]
5700 : : EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5701 [ # # ]: 0 : if (IS_ERR(handle))
5702 : 0 : return PTR_ERR(handle);
5703 : 0 : ret = dquot_acquire(dquot);
5704 : 0 : err = ext4_journal_stop(handle);
5705 [ # # ]: 0 : if (!ret)
5706 : : ret = err;
5707 : 0 : return ret;
5708 : : }
5709 : :
5710 : 0 : static int ext4_release_dquot(struct dquot *dquot)
5711 : : {
5712 : : int ret, err;
5713 : : handle_t *handle;
5714 : :
5715 [ # # # # ]: 0 : handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5716 : : EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5717 [ # # ]: 0 : if (IS_ERR(handle)) {
5718 : : /* Release dquot anyway to avoid endless cycle in dqput() */
5719 : 0 : dquot_release(dquot);
5720 : 0 : return PTR_ERR(handle);
5721 : : }
5722 : 0 : ret = dquot_release(dquot);
5723 : 0 : err = ext4_journal_stop(handle);
5724 [ # # ]: 0 : if (!ret)
5725 : : ret = err;
5726 : 0 : return ret;
5727 : : }
5728 : :
5729 : 0 : static int ext4_mark_dquot_dirty(struct dquot *dquot)
5730 : : {
5731 : 0 : struct super_block *sb = dquot->dq_sb;
5732 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
5733 : :
5734 : : /* Are we journaling quotas? */
5735 [ # # # # ]: 0 : if (ext4_has_feature_quota(sb) ||
5736 [ # # ]: 0 : sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5737 : 0 : dquot_mark_dquot_dirty(dquot);
5738 : 0 : return ext4_write_dquot(dquot);
5739 : : } else {
5740 : 0 : return dquot_mark_dquot_dirty(dquot);
5741 : : }
5742 : : }
5743 : :
5744 : 0 : static int ext4_write_info(struct super_block *sb, int type)
5745 : : {
5746 : : int ret, err;
5747 : : handle_t *handle;
5748 : :
5749 : : /* Data block + inode block */
5750 : 0 : handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5751 [ # # ]: 0 : if (IS_ERR(handle))
5752 : 0 : return PTR_ERR(handle);
5753 : 0 : ret = dquot_commit_info(sb, type);
5754 : 0 : err = ext4_journal_stop(handle);
5755 [ # # ]: 0 : if (!ret)
5756 : : ret = err;
5757 : 0 : return ret;
5758 : : }
5759 : :
5760 : : /*
5761 : : * Turn on quotas during mount time - we need to find
5762 : : * the quota file and such...
5763 : : */
5764 : : static int ext4_quota_on_mount(struct super_block *sb, int type)
5765 : : {
5766 : 0 : return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
5767 : : EXT4_SB(sb)->s_jquota_fmt, type);
5768 : : }
5769 : :
5770 : : static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5771 : : {
5772 : : struct ext4_inode_info *ei = EXT4_I(inode);
5773 : :
5774 : : /* The first argument of lockdep_set_subclass has to be
5775 : : * *exactly* the same as the argument to init_rwsem() --- in
5776 : : * this case, in init_once() --- or lockdep gets unhappy
5777 : : * because the name of the lock is set using the
5778 : : * stringification of the argument to init_rwsem().
5779 : : */
5780 : : (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5781 : : lockdep_set_subclass(&ei->i_data_sem, subclass);
5782 : : }
5783 : :
5784 : : /*
5785 : : * Standard function to be called on quota_on
5786 : : */
5787 : 0 : static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5788 : : const struct path *path)
5789 : : {
5790 : : int err;
5791 : :
5792 [ # # ]: 0 : if (!test_opt(sb, QUOTA))
5793 : : return -EINVAL;
5794 : :
5795 : : /* Quotafile not on the same filesystem? */
5796 [ # # ]: 0 : if (path->dentry->d_sb != sb)
5797 : : return -EXDEV;
5798 : : /* Journaling quota? */
5799 [ # # ]: 0 : if (EXT4_SB(sb)->s_qf_names[type]) {
5800 : : /* Quotafile not in fs root? */
5801 [ # # ]: 0 : if (path->dentry->d_parent != sb->s_root)
5802 : 0 : ext4_msg(sb, KERN_WARNING,
5803 : : "Quota file not on filesystem root. "
5804 : : "Journaled quota will not work");
5805 : 0 : sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5806 : : } else {
5807 : : /*
5808 : : * Clear the flag just in case mount options changed since
5809 : : * last time.
5810 : : */
5811 : 0 : sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5812 : : }
5813 : :
5814 : : /*
5815 : : * When we journal data on quota file, we have to flush journal to see
5816 : : * all updates to the file when we bypass pagecache...
5817 : : */
5818 [ # # # # ]: 0 : if (EXT4_SB(sb)->s_journal &&
5819 : 0 : ext4_should_journal_data(d_inode(path->dentry))) {
5820 : : /*
5821 : : * We don't need to lock updates but journal_flush() could
5822 : : * otherwise be livelocked...
5823 : : */
5824 : 0 : jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5825 : 0 : err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5826 : 0 : jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5827 [ # # ]: 0 : if (err)
5828 : : return err;
5829 : : }
5830 : :
5831 : : lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5832 : 0 : err = dquot_quota_on(sb, type, format_id, path);
5833 [ # # ]: 0 : if (err) {
5834 : : lockdep_set_quota_inode(path->dentry->d_inode,
5835 : : I_DATA_SEM_NORMAL);
5836 : : } else {
5837 : 0 : struct inode *inode = d_inode(path->dentry);
5838 : : handle_t *handle;
5839 : :
5840 : : /*
5841 : : * Set inode flags to prevent userspace from messing with quota
5842 : : * files. If this fails, we return success anyway since quotas
5843 : : * are already enabled and this is not a hard failure.
5844 : : */
5845 : : inode_lock(inode);
5846 : : handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5847 [ # # ]: 0 : if (IS_ERR(handle))
5848 : : goto unlock_inode;
5849 : 0 : EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5850 : 0 : inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5851 : : S_NOATIME | S_IMMUTABLE);
5852 : 0 : ext4_mark_inode_dirty(handle, inode);
5853 : 0 : ext4_journal_stop(handle);
5854 : : unlock_inode:
5855 : : inode_unlock(inode);
5856 : : }
5857 : 0 : return err;
5858 : : }
5859 : :
5860 : 0 : static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5861 : : unsigned int flags)
5862 : : {
5863 : : int err;
5864 : : struct inode *qf_inode;
5865 : 0 : unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5866 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5867 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5868 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5869 : : };
5870 : :
5871 [ # # ]: 0 : BUG_ON(!ext4_has_feature_quota(sb));
5872 : :
5873 [ # # ]: 0 : if (!qf_inums[type])
5874 : : return -EPERM;
5875 : :
5876 : 0 : qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
5877 [ # # ]: 0 : if (IS_ERR(qf_inode)) {
5878 : 0 : ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5879 : 0 : return PTR_ERR(qf_inode);
5880 : : }
5881 : :
5882 : : /* Don't account quota for quota files to avoid recursion */
5883 : 0 : qf_inode->i_flags |= S_NOQUOTA;
5884 : : lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5885 : 0 : err = dquot_enable(qf_inode, type, format_id, flags);
5886 : : if (err)
5887 : : lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5888 : 0 : iput(qf_inode);
5889 : :
5890 : 0 : return err;
5891 : : }
5892 : :
5893 : : /* Enable usage tracking for all quota types. */
5894 : 0 : static int ext4_enable_quotas(struct super_block *sb)
5895 : : {
5896 : : int type, err = 0;
5897 : 0 : unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5898 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5899 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5900 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5901 : : };
5902 : 0 : bool quota_mopt[EXT4_MAXQUOTAS] = {
5903 : 0 : test_opt(sb, USRQUOTA),
5904 : 0 : test_opt(sb, GRPQUOTA),
5905 : 0 : test_opt(sb, PRJQUOTA),
5906 : : };
5907 : :
5908 : 0 : sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5909 [ # # ]: 0 : for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5910 [ # # ]: 0 : if (qf_inums[type]) {
5911 [ # # ]: 0 : err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5912 : : DQUOT_USAGE_ENABLED |
5913 : 0 : (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5914 [ # # ]: 0 : if (err) {
5915 : 0 : ext4_warning(sb,
5916 : : "Failed to enable quota tracking "
5917 : : "(type=%d, err=%d). Please run "
5918 : : "e2fsck to fix.", type, err);
5919 [ # # ]: 0 : for (type--; type >= 0; type--)
5920 : 0 : dquot_quota_off(sb, type);
5921 : :
5922 : 0 : return err;
5923 : : }
5924 : : }
5925 : : }
5926 : : return 0;
5927 : : }
5928 : :
5929 : 0 : static int ext4_quota_off(struct super_block *sb, int type)
5930 : : {
5931 : 0 : struct inode *inode = sb_dqopt(sb)->files[type];
5932 : : handle_t *handle;
5933 : : int err;
5934 : :
5935 : : /* Force all delayed allocation blocks to be allocated.
5936 : : * Caller already holds s_umount sem */
5937 [ # # ]: 0 : if (test_opt(sb, DELALLOC))
5938 : 0 : sync_filesystem(sb);
5939 : :
5940 [ # # # # ]: 0 : if (!inode || !igrab(inode))
5941 : : goto out;
5942 : :
5943 : 0 : err = dquot_quota_off(sb, type);
5944 [ # # # # ]: 0 : if (err || ext4_has_feature_quota(sb))
5945 : : goto out_put;
5946 : :
5947 : : inode_lock(inode);
5948 : : /*
5949 : : * Update modification times of quota files when userspace can
5950 : : * start looking at them. If we fail, we return success anyway since
5951 : : * this is not a hard failure and quotas are already disabled.
5952 : : */
5953 : : handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5954 [ # # ]: 0 : if (IS_ERR(handle))
5955 : : goto out_unlock;
5956 : 0 : EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5957 : 0 : inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5958 : 0 : inode->i_mtime = inode->i_ctime = current_time(inode);
5959 : 0 : ext4_mark_inode_dirty(handle, inode);
5960 : 0 : ext4_journal_stop(handle);
5961 : : out_unlock:
5962 : : inode_unlock(inode);
5963 : : out_put:
5964 : : lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5965 : 0 : iput(inode);
5966 : 0 : return err;
5967 : : out:
5968 : 0 : return dquot_quota_off(sb, type);
5969 : : }
5970 : :
5971 : : /* Read data from quotafile - avoid pagecache and such because we cannot afford
5972 : : * acquiring the locks... As quota files are never truncated and quota code
5973 : : * itself serializes the operations (and no one else should touch the files)
5974 : : * we don't have to be afraid of races */
5975 : 0 : static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5976 : : size_t len, loff_t off)
5977 : : {
5978 : 0 : struct inode *inode = sb_dqopt(sb)->files[type];
5979 : 0 : ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5980 : 0 : int offset = off & (sb->s_blocksize - 1);
5981 : : int tocopy;
5982 : : size_t toread;
5983 : : struct buffer_head *bh;
5984 : : loff_t i_size = i_size_read(inode);
5985 : :
5986 [ # # ]: 0 : if (off > i_size)
5987 : : return 0;
5988 [ # # ]: 0 : if (off+len > i_size)
5989 : 0 : len = i_size-off;
5990 : : toread = len;
5991 [ # # ]: 0 : while (toread > 0) {
5992 : : tocopy = sb->s_blocksize - offset < toread ?
5993 : 0 : sb->s_blocksize - offset : toread;
5994 : 0 : bh = ext4_bread(NULL, inode, blk, 0);
5995 [ # # ]: 0 : if (IS_ERR(bh))
5996 : 0 : return PTR_ERR(bh);
5997 [ # # ]: 0 : if (!bh) /* A hole? */
5998 : 0 : memset(data, 0, tocopy);
5999 : : else
6000 : 0 : memcpy(data, bh->b_data+offset, tocopy);
6001 : : brelse(bh);
6002 : : offset = 0;
6003 : 0 : toread -= tocopy;
6004 : 0 : data += tocopy;
6005 : 0 : blk++;
6006 : : }
6007 : 0 : return len;
6008 : : }
6009 : :
6010 : : /* Write to quotafile (we know the transaction is already started and has
6011 : : * enough credits) */
6012 : 0 : static ssize_t ext4_quota_write(struct super_block *sb, int type,
6013 : : const char *data, size_t len, loff_t off)
6014 : : {
6015 : 0 : struct inode *inode = sb_dqopt(sb)->files[type];
6016 : 0 : ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
6017 : 0 : int err, offset = off & (sb->s_blocksize - 1);
6018 : 0 : int retries = 0;
6019 : : struct buffer_head *bh;
6020 : : handle_t *handle = journal_current_handle();
6021 : :
6022 [ # # # # ]: 0 : if (EXT4_SB(sb)->s_journal && !handle) {
6023 : 0 : ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6024 : : " cancelled because transaction is not started",
6025 : : (unsigned long long)off, (unsigned long long)len);
6026 : 0 : return -EIO;
6027 : : }
6028 : : /*
6029 : : * Since we account only one data block in transaction credits,
6030 : : * then it is impossible to cross a block boundary.
6031 : : */
6032 [ # # ]: 0 : if (sb->s_blocksize - offset < len) {
6033 : 0 : ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6034 : : " cancelled because not block aligned",
6035 : : (unsigned long long)off, (unsigned long long)len);
6036 : 0 : return -EIO;
6037 : : }
6038 : :
6039 : : do {
6040 : 0 : bh = ext4_bread(handle, inode, blk,
6041 : : EXT4_GET_BLOCKS_CREATE |
6042 : : EXT4_GET_BLOCKS_METADATA_NOFAIL);
6043 [ # # # # ]: 0 : } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
6044 [ # # ]: 0 : ext4_should_retry_alloc(inode->i_sb, &retries));
6045 [ # # ]: 0 : if (IS_ERR(bh))
6046 : 0 : return PTR_ERR(bh);
6047 [ # # ]: 0 : if (!bh)
6048 : : goto out;
6049 : : BUFFER_TRACE(bh, "get write access");
6050 : 0 : err = ext4_journal_get_write_access(handle, bh);
6051 [ # # ]: 0 : if (err) {
6052 : : brelse(bh);
6053 : 0 : return err;
6054 : : }
6055 : 0 : lock_buffer(bh);
6056 : 0 : memcpy(bh->b_data+offset, data, len);
6057 : 0 : flush_dcache_page(bh->b_page);
6058 : 0 : unlock_buffer(bh);
6059 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
6060 : : brelse(bh);
6061 : : out:
6062 [ # # ]: 0 : if (inode->i_size < off + len) {
6063 : : i_size_write(inode, off + len);
6064 : 0 : EXT4_I(inode)->i_disksize = inode->i_size;
6065 : 0 : ext4_mark_inode_dirty(handle, inode);
6066 : : }
6067 : 0 : return len;
6068 : : }
6069 : :
6070 : 0 : static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
6071 : : {
6072 : : const struct quota_format_ops *ops;
6073 : :
6074 [ # # ]: 0 : if (!sb_has_quota_loaded(sb, qid->type))
6075 : : return -ESRCH;
6076 : 0 : ops = sb_dqopt(sb)->ops[qid->type];
6077 [ # # # # ]: 0 : if (!ops || !ops->get_next_id)
6078 : : return -ENOSYS;
6079 : 0 : return dquot_get_next_id(sb, qid);
6080 : : }
6081 : : #endif
6082 : :
6083 : 207 : static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6084 : : const char *dev_name, void *data)
6085 : : {
6086 : 207 : return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
6087 : : }
6088 : :
6089 : : #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6090 : 207 : static inline void register_as_ext2(void)
6091 : : {
6092 : 207 : int err = register_filesystem(&ext2_fs_type);
6093 [ - + ]: 207 : if (err)
6094 : 0 : printk(KERN_WARNING
6095 : : "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6096 : 207 : }
6097 : :
6098 : : static inline void unregister_as_ext2(void)
6099 : : {
6100 : 0 : unregister_filesystem(&ext2_fs_type);
6101 : : }
6102 : :
6103 : : static inline int ext2_feature_set_ok(struct super_block *sb)
6104 : : {
6105 [ # # ]: 0 : if (ext4_has_unknown_ext2_incompat_features(sb))
6106 : : return 0;
6107 [ # # ]: 0 : if (sb_rdonly(sb))
6108 : : return 1;
6109 [ # # ]: 0 : if (ext4_has_unknown_ext2_ro_compat_features(sb))
6110 : : return 0;
6111 : : return 1;
6112 : : }
6113 : : #else
6114 : : static inline void register_as_ext2(void) { }
6115 : : static inline void unregister_as_ext2(void) { }
6116 : : static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
6117 : : #endif
6118 : :
6119 : 207 : static inline void register_as_ext3(void)
6120 : : {
6121 : 207 : int err = register_filesystem(&ext3_fs_type);
6122 [ - + ]: 207 : if (err)
6123 : 0 : printk(KERN_WARNING
6124 : : "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6125 : 207 : }
6126 : :
6127 : : static inline void unregister_as_ext3(void)
6128 : : {
6129 : 0 : unregister_filesystem(&ext3_fs_type);
6130 : : }
6131 : :
6132 : 0 : static inline int ext3_feature_set_ok(struct super_block *sb)
6133 : : {
6134 [ # # ]: 0 : if (ext4_has_unknown_ext3_incompat_features(sb))
6135 : : return 0;
6136 [ # # ]: 0 : if (!ext4_has_feature_journal(sb))
6137 : : return 0;
6138 [ # # ]: 0 : if (sb_rdonly(sb))
6139 : : return 1;
6140 [ # # ]: 0 : if (ext4_has_unknown_ext3_ro_compat_features(sb))
6141 : : return 0;
6142 : 0 : return 1;
6143 : : }
6144 : :
6145 : : static struct file_system_type ext4_fs_type = {
6146 : : .owner = THIS_MODULE,
6147 : : .name = "ext4",
6148 : : .mount = ext4_mount,
6149 : : .kill_sb = kill_block_super,
6150 : : .fs_flags = FS_REQUIRES_DEV,
6151 : : };
6152 : : MODULE_ALIAS_FS("ext4");
6153 : :
6154 : : /* Shared across all ext4 file systems */
6155 : : wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
6156 : :
6157 : 207 : static int __init ext4_init_fs(void)
6158 : : {
6159 : : int i, err;
6160 : :
6161 : : ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
6162 : 207 : ext4_li_info = NULL;
6163 : 207 : mutex_init(&ext4_li_mtx);
6164 : :
6165 : : /* Build-time check for flags consistency */
6166 : : ext4_check_flag_values();
6167 : :
6168 [ + + ]: 7866 : for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
6169 : 7659 : init_waitqueue_head(&ext4__ioend_wq[i]);
6170 : :
6171 : 207 : err = ext4_init_es();
6172 [ + - ]: 207 : if (err)
6173 : : return err;
6174 : :
6175 : 207 : err = ext4_init_pending();
6176 [ + - ]: 207 : if (err)
6177 : : goto out7;
6178 : :
6179 : 207 : err = ext4_init_post_read_processing();
6180 [ + - ]: 207 : if (err)
6181 : : goto out6;
6182 : :
6183 : 207 : err = ext4_init_pageio();
6184 [ + - ]: 207 : if (err)
6185 : : goto out5;
6186 : :
6187 : 207 : err = ext4_init_system_zone();
6188 [ + - ]: 207 : if (err)
6189 : : goto out4;
6190 : :
6191 : 207 : err = ext4_init_sysfs();
6192 [ + - ]: 207 : if (err)
6193 : : goto out3;
6194 : :
6195 : 207 : err = ext4_init_mballoc();
6196 [ + - ]: 207 : if (err)
6197 : : goto out2;
6198 : 207 : err = init_inodecache();
6199 [ + - ]: 207 : if (err)
6200 : : goto out1;
6201 : 207 : register_as_ext3();
6202 : 207 : register_as_ext2();
6203 : 207 : err = register_filesystem(&ext4_fs_type);
6204 [ - + ]: 207 : if (err)
6205 : : goto out;
6206 : :
6207 : : return 0;
6208 : : out:
6209 : : unregister_as_ext2();
6210 : : unregister_as_ext3();
6211 : : destroy_inodecache();
6212 : : out1:
6213 : 0 : ext4_exit_mballoc();
6214 : : out2:
6215 : 0 : ext4_exit_sysfs();
6216 : : out3:
6217 : 0 : ext4_exit_system_zone();
6218 : : out4:
6219 : 0 : ext4_exit_pageio();
6220 : : out5:
6221 : 0 : ext4_exit_post_read_processing();
6222 : : out6:
6223 : 0 : ext4_exit_pending();
6224 : : out7:
6225 : 0 : ext4_exit_es();
6226 : :
6227 : 0 : return err;
6228 : : }
6229 : :
6230 : 0 : static void __exit ext4_exit_fs(void)
6231 : : {
6232 : 0 : ext4_destroy_lazyinit_thread();
6233 : : unregister_as_ext2();
6234 : : unregister_as_ext3();
6235 : 0 : unregister_filesystem(&ext4_fs_type);
6236 : : destroy_inodecache();
6237 : 0 : ext4_exit_mballoc();
6238 : 0 : ext4_exit_sysfs();
6239 : 0 : ext4_exit_system_zone();
6240 : 0 : ext4_exit_pageio();
6241 : 0 : ext4_exit_post_read_processing();
6242 : 0 : ext4_exit_es();
6243 : 0 : ext4_exit_pending();
6244 : 0 : }
6245 : :
6246 : : MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6247 : : MODULE_DESCRIPTION("Fourth Extended Filesystem");
6248 : : MODULE_LICENSE("GPL");
6249 : : MODULE_SOFTDEP("pre: crc32c");
6250 : : module_init(ext4_init_fs)
6251 : : module_exit(ext4_exit_fs)
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