Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * linux/fs/ext4/resize.c
4 : : *
5 : : * Support for resizing an ext4 filesystem while it is mounted.
6 : : *
7 : : * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com>
8 : : *
9 : : * This could probably be made into a module, because it is not often in use.
10 : : */
11 : :
12 : :
13 : : #define EXT4FS_DEBUG
14 : :
15 : : #include <linux/errno.h>
16 : : #include <linux/slab.h>
17 : :
18 : : #include "ext4_jbd2.h"
19 : :
20 : : struct ext4_rcu_ptr {
21 : : struct rcu_head rcu;
22 : : void *ptr;
23 : : };
24 : :
25 : 0 : static void ext4_rcu_ptr_callback(struct rcu_head *head)
26 : : {
27 : : struct ext4_rcu_ptr *ptr;
28 : :
29 : : ptr = container_of(head, struct ext4_rcu_ptr, rcu);
30 : 0 : kvfree(ptr->ptr);
31 : 0 : kfree(ptr);
32 : 0 : }
33 : :
34 : 0 : void ext4_kvfree_array_rcu(void *to_free)
35 : : {
36 : 0 : struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
37 : :
38 [ # # ]: 0 : if (ptr) {
39 : 0 : ptr->ptr = to_free;
40 : 0 : call_rcu(&ptr->rcu, ext4_rcu_ptr_callback);
41 : 0 : return;
42 : : }
43 : 0 : synchronize_rcu();
44 : 0 : kvfree(to_free);
45 : : }
46 : :
47 : 0 : int ext4_resize_begin(struct super_block *sb)
48 : : {
49 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
50 : : int ret = 0;
51 : :
52 [ # # ]: 0 : if (!capable(CAP_SYS_RESOURCE))
53 : : return -EPERM;
54 : :
55 : : /*
56 : : * If we are not using the primary superblock/GDT copy don't resize,
57 : : * because the user tools have no way of handling this. Probably a
58 : : * bad time to do it anyways.
59 : : */
60 [ # # ]: 0 : if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) !=
61 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
62 : 0 : ext4_warning(sb, "won't resize using backup superblock at %llu",
63 : : (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
64 : 0 : return -EPERM;
65 : : }
66 : :
67 : : /*
68 : : * We are not allowed to do online-resizing on a filesystem mounted
69 : : * with error, because it can destroy the filesystem easily.
70 : : */
71 [ # # ]: 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
72 : 0 : ext4_warning(sb, "There are errors in the filesystem, "
73 : : "so online resizing is not allowed");
74 : 0 : return -EPERM;
75 : : }
76 : :
77 [ # # ]: 0 : if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
78 : 0 : &EXT4_SB(sb)->s_ext4_flags))
79 : : ret = -EBUSY;
80 : :
81 : 0 : return ret;
82 : : }
83 : :
84 : 0 : void ext4_resize_end(struct super_block *sb)
85 : : {
86 : 0 : clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags);
87 : 0 : smp_mb__after_atomic();
88 : 0 : }
89 : :
90 : : static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
91 : : ext4_group_t group) {
92 : 0 : return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
93 : : EXT4_DESC_PER_BLOCK_BITS(sb);
94 : : }
95 : :
96 : : static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
97 : : ext4_group_t group) {
98 : : group = ext4_meta_bg_first_group(sb, group);
99 : : return ext4_group_first_block_no(sb, group);
100 : : }
101 : :
102 : 0 : static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
103 : : ext4_group_t group) {
104 : : ext4_grpblk_t overhead;
105 : 0 : overhead = ext4_bg_num_gdb(sb, group);
106 [ # # ]: 0 : if (ext4_bg_has_super(sb, group))
107 : 0 : overhead += 1 +
108 : 0 : le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
109 : 0 : return overhead;
110 : : }
111 : :
112 : : #define outside(b, first, last) ((b) < (first) || (b) >= (last))
113 : : #define inside(b, first, last) ((b) >= (first) && (b) < (last))
114 : :
115 : 0 : static int verify_group_input(struct super_block *sb,
116 : : struct ext4_new_group_data *input)
117 : : {
118 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
119 : 0 : struct ext4_super_block *es = sbi->s_es;
120 : : ext4_fsblk_t start = ext4_blocks_count(es);
121 : 0 : ext4_fsblk_t end = start + input->blocks_count;
122 : 0 : ext4_group_t group = input->group;
123 : 0 : ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
124 : : unsigned overhead;
125 : : ext4_fsblk_t metaend;
126 : : struct buffer_head *bh = NULL;
127 : : ext4_grpblk_t free_blocks_count, offset;
128 : : int err = -EINVAL;
129 : :
130 [ # # ]: 0 : if (group != sbi->s_groups_count) {
131 : 0 : ext4_warning(sb, "Cannot add at group %u (only %u groups)",
132 : : input->group, sbi->s_groups_count);
133 : 0 : return -EINVAL;
134 : : }
135 : :
136 : 0 : overhead = ext4_group_overhead_blocks(sb, group);
137 : 0 : metaend = start + overhead;
138 : 0 : input->free_clusters_count = free_blocks_count =
139 : 0 : input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
140 : :
141 [ # # ]: 0 : if (test_opt(sb, DEBUG))
142 [ # # ]: 0 : printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
143 : : "(%d free, %u reserved)\n",
144 : 0 : ext4_bg_has_super(sb, input->group) ? "normal" :
145 : : "no-super", input->group, input->blocks_count,
146 : 0 : free_blocks_count, input->reserved_blocks);
147 : :
148 : 0 : ext4_get_group_no_and_offset(sb, start, NULL, &offset);
149 [ # # ]: 0 : if (offset != 0)
150 : 0 : ext4_warning(sb, "Last group not full");
151 [ # # ]: 0 : else if (input->reserved_blocks > input->blocks_count / 5)
152 : 0 : ext4_warning(sb, "Reserved blocks too high (%u)",
153 : : input->reserved_blocks);
154 [ # # ]: 0 : else if (free_blocks_count < 0)
155 : 0 : ext4_warning(sb, "Bad blocks count %u",
156 : : input->blocks_count);
157 [ # # ]: 0 : else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) {
158 : : err = PTR_ERR(bh);
159 : : bh = NULL;
160 : 0 : ext4_warning(sb, "Cannot read last block (%llu)",
161 : : end - 1);
162 [ # # # # ]: 0 : } else if (outside(input->block_bitmap, start, end))
163 : 0 : ext4_warning(sb, "Block bitmap not in group (block %llu)",
164 : : (unsigned long long)input->block_bitmap);
165 [ # # # # ]: 0 : else if (outside(input->inode_bitmap, start, end))
166 : 0 : ext4_warning(sb, "Inode bitmap not in group (block %llu)",
167 : : (unsigned long long)input->inode_bitmap);
168 [ # # # # : 0 : else if (outside(input->inode_table, start, end) ||
# # ]
169 [ # # ]: 0 : outside(itend - 1, start, end))
170 : 0 : ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
171 : : (unsigned long long)input->inode_table, itend - 1);
172 [ # # ]: 0 : else if (input->inode_bitmap == input->block_bitmap)
173 : 0 : ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
174 : : (unsigned long long)input->block_bitmap);
175 [ # # # # ]: 0 : else if (inside(input->block_bitmap, input->inode_table, itend))
176 : 0 : ext4_warning(sb, "Block bitmap (%llu) in inode table "
177 : : "(%llu-%llu)",
178 : : (unsigned long long)input->block_bitmap,
179 : : (unsigned long long)input->inode_table, itend - 1);
180 [ # # # # ]: 0 : else if (inside(input->inode_bitmap, input->inode_table, itend))
181 : 0 : ext4_warning(sb, "Inode bitmap (%llu) in inode table "
182 : : "(%llu-%llu)",
183 : : (unsigned long long)input->inode_bitmap,
184 : : (unsigned long long)input->inode_table, itend - 1);
185 [ # # # # ]: 0 : else if (inside(input->block_bitmap, start, metaend))
186 : 0 : ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
187 : : (unsigned long long)input->block_bitmap,
188 : : start, metaend - 1);
189 [ # # # # ]: 0 : else if (inside(input->inode_bitmap, start, metaend))
190 : 0 : ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
191 : : (unsigned long long)input->inode_bitmap,
192 : : start, metaend - 1);
193 [ # # # # : 0 : else if (inside(input->inode_table, start, metaend) ||
# # ]
194 [ # # ]: 0 : inside(itend - 1, start, metaend))
195 : 0 : ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
196 : : "(%llu-%llu)",
197 : : (unsigned long long)input->inode_table,
198 : : itend - 1, start, metaend - 1);
199 : : else
200 : : err = 0;
201 : : brelse(bh);
202 : :
203 : 0 : return err;
204 : : }
205 : :
206 : : /*
207 : : * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
208 : : * group each time.
209 : : */
210 : : struct ext4_new_flex_group_data {
211 : : struct ext4_new_group_data *groups; /* new_group_data for groups
212 : : in the flex group */
213 : : __u16 *bg_flags; /* block group flags of groups
214 : : in @groups */
215 : : ext4_group_t count; /* number of groups in @groups
216 : : */
217 : : };
218 : :
219 : : /*
220 : : * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
221 : : * @flexbg_size.
222 : : *
223 : : * Returns NULL on failure otherwise address of the allocated structure.
224 : : */
225 : 0 : static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
226 : : {
227 : : struct ext4_new_flex_group_data *flex_gd;
228 : :
229 : : flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
230 [ # # ]: 0 : if (flex_gd == NULL)
231 : : goto out3;
232 : :
233 [ # # ]: 0 : if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
234 : : goto out2;
235 : 0 : flex_gd->count = flexbg_size;
236 : :
237 : 0 : flex_gd->groups = kmalloc_array(flexbg_size,
238 : : sizeof(struct ext4_new_group_data),
239 : : GFP_NOFS);
240 [ # # ]: 0 : if (flex_gd->groups == NULL)
241 : : goto out2;
242 : :
243 : 0 : flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16),
244 : : GFP_NOFS);
245 [ # # ]: 0 : if (flex_gd->bg_flags == NULL)
246 : : goto out1;
247 : :
248 : : return flex_gd;
249 : :
250 : : out1:
251 : 0 : kfree(flex_gd->groups);
252 : : out2:
253 : 0 : kfree(flex_gd);
254 : : out3:
255 : : return NULL;
256 : : }
257 : :
258 : 0 : static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
259 : : {
260 : 0 : kfree(flex_gd->bg_flags);
261 : 0 : kfree(flex_gd->groups);
262 : 0 : kfree(flex_gd);
263 : 0 : }
264 : :
265 : : /*
266 : : * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps
267 : : * and inode tables for a flex group.
268 : : *
269 : : * This function is used by 64bit-resize. Note that this function allocates
270 : : * group tables from the 1st group of groups contained by @flexgd, which may
271 : : * be a partial of a flex group.
272 : : *
273 : : * @sb: super block of fs to which the groups belongs
274 : : *
275 : : * Returns 0 on a successful allocation of the metadata blocks in the
276 : : * block group.
277 : : */
278 : 0 : static int ext4_alloc_group_tables(struct super_block *sb,
279 : : struct ext4_new_flex_group_data *flex_gd,
280 : : int flexbg_size)
281 : : {
282 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
283 : : ext4_fsblk_t start_blk;
284 : : ext4_fsblk_t last_blk;
285 : : ext4_group_t src_group;
286 : : ext4_group_t bb_index = 0;
287 : : ext4_group_t ib_index = 0;
288 : : ext4_group_t it_index = 0;
289 : : ext4_group_t group;
290 : : ext4_group_t last_group;
291 : : unsigned overhead;
292 [ # # ]: 0 : __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
293 : : int i;
294 : :
295 [ # # # # ]: 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
296 : :
297 : 0 : src_group = group_data[0].group;
298 : 0 : last_group = src_group + flex_gd->count - 1;
299 : :
300 [ # # # # ]: 0 : BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
301 : : (last_group & ~(flexbg_size - 1))));
302 : : next_group:
303 : 0 : group = group_data[0].group;
304 [ # # ]: 0 : if (src_group >= group_data[0].group + flex_gd->count)
305 : : return -ENOSPC;
306 : : start_blk = ext4_group_first_block_no(sb, src_group);
307 : 0 : last_blk = start_blk + group_data[src_group - group].blocks_count;
308 : :
309 : 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
310 : :
311 : 0 : start_blk += overhead;
312 : :
313 : : /* We collect contiguous blocks as much as possible. */
314 : 0 : src_group++;
315 [ # # ]: 0 : for (; src_group <= last_group; src_group++) {
316 : 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
317 [ # # ]: 0 : if (overhead == 0)
318 : 0 : last_blk += group_data[src_group - group].blocks_count;
319 : : else
320 : : break;
321 : : }
322 : :
323 : : /* Allocate block bitmaps */
324 [ # # ]: 0 : for (; bb_index < flex_gd->count; bb_index++) {
325 [ # # ]: 0 : if (start_blk >= last_blk)
326 : : goto next_group;
327 : 0 : group_data[bb_index].block_bitmap = start_blk++;
328 : 0 : group = ext4_get_group_number(sb, start_blk - 1);
329 : 0 : group -= group_data[0].group;
330 : 0 : group_data[group].mdata_blocks++;
331 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
332 : : }
333 : :
334 : : /* Allocate inode bitmaps */
335 [ # # ]: 0 : for (; ib_index < flex_gd->count; ib_index++) {
336 [ # # ]: 0 : if (start_blk >= last_blk)
337 : : goto next_group;
338 : 0 : group_data[ib_index].inode_bitmap = start_blk++;
339 : 0 : group = ext4_get_group_number(sb, start_blk - 1);
340 : 0 : group -= group_data[0].group;
341 : 0 : group_data[group].mdata_blocks++;
342 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
343 : : }
344 : :
345 : : /* Allocate inode tables */
346 [ # # ]: 0 : for (; it_index < flex_gd->count; it_index++) {
347 : 0 : unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
348 : : ext4_fsblk_t next_group_start;
349 : :
350 [ # # ]: 0 : if (start_blk + itb > last_blk)
351 : : goto next_group;
352 : 0 : group_data[it_index].inode_table = start_blk;
353 : 0 : group = ext4_get_group_number(sb, start_blk);
354 : 0 : next_group_start = ext4_group_first_block_no(sb, group + 1);
355 : 0 : group -= group_data[0].group;
356 : :
357 [ # # ]: 0 : if (start_blk + itb > next_group_start) {
358 : 0 : flex_gd->bg_flags[group + 1] &= uninit_mask;
359 : 0 : overhead = start_blk + itb - next_group_start;
360 : 0 : group_data[group + 1].mdata_blocks += overhead;
361 : 0 : itb -= overhead;
362 : : }
363 : :
364 : 0 : group_data[group].mdata_blocks += itb;
365 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
366 : 0 : start_blk += EXT4_SB(sb)->s_itb_per_group;
367 : : }
368 : :
369 : : /* Update free clusters count to exclude metadata blocks */
370 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
371 : 0 : group_data[i].free_clusters_count -=
372 : 0 : EXT4_NUM_B2C(EXT4_SB(sb),
373 : : group_data[i].mdata_blocks);
374 : : }
375 : :
376 [ # # ]: 0 : if (test_opt(sb, DEBUG)) {
377 : : int i;
378 : : group = group_data[0].group;
379 : :
380 : 0 : printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
381 : : "%d groups, flexbg size is %d:\n", flex_gd->count,
382 : : flexbg_size);
383 : :
384 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
385 : : ext4_debug(
386 : : "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n",
387 : : ext4_bg_has_super(sb, group + i) ? "normal" :
388 : : "no-super", group + i,
389 : : group_data[i].blocks_count,
390 : : group_data[i].free_clusters_count,
391 : : group_data[i].mdata_blocks);
392 : : }
393 : : }
394 : : return 0;
395 : : }
396 : :
397 : 0 : static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
398 : : ext4_fsblk_t blk)
399 : : {
400 : : struct buffer_head *bh;
401 : : int err;
402 : :
403 : : bh = sb_getblk(sb, blk);
404 [ # # ]: 0 : if (unlikely(!bh))
405 : : return ERR_PTR(-ENOMEM);
406 : : BUFFER_TRACE(bh, "get_write_access");
407 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, bh))) {
408 : : brelse(bh);
409 : : bh = ERR_PTR(err);
410 : : } else {
411 : 0 : memset(bh->b_data, 0, sb->s_blocksize);
412 : : set_buffer_uptodate(bh);
413 : : }
414 : :
415 : 0 : return bh;
416 : : }
417 : :
418 : : /*
419 : : * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA.
420 : : * If that fails, restart the transaction & regain write access for the
421 : : * buffer head which is used for block_bitmap modifications.
422 : : */
423 : 0 : static int extend_or_restart_transaction(handle_t *handle, int thresh)
424 : : {
425 : : int err;
426 : :
427 [ # # ]: 0 : if (ext4_handle_has_enough_credits(handle, thresh))
428 : : return 0;
429 : :
430 : : err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA);
431 [ # # ]: 0 : if (err < 0)
432 : : return err;
433 [ # # ]: 0 : if (err) {
434 : : err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA);
435 [ # # ]: 0 : if (err)
436 : 0 : return err;
437 : : }
438 : :
439 : : return 0;
440 : : }
441 : :
442 : : /*
443 : : * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used.
444 : : *
445 : : * Helper function for ext4_setup_new_group_blocks() which set .
446 : : *
447 : : * @sb: super block
448 : : * @handle: journal handle
449 : : * @flex_gd: flex group data
450 : : */
451 : 0 : static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
452 : : struct ext4_new_flex_group_data *flex_gd,
453 : : ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster)
454 : : {
455 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
456 : 0 : ext4_group_t count = last_cluster - first_cluster + 1;
457 : : ext4_group_t count2;
458 : :
459 : : ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster,
460 : : last_cluster);
461 [ # # ]: 0 : for (count2 = count; count > 0;
462 : 0 : count -= count2, first_cluster += count2) {
463 : : ext4_fsblk_t start;
464 : : struct buffer_head *bh;
465 : : ext4_group_t group;
466 : : int err;
467 : :
468 : 0 : group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster));
469 : 0 : start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group));
470 : 0 : group -= flex_gd->groups[0].group;
471 : :
472 : 0 : count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start);
473 [ # # ]: 0 : if (count2 > count)
474 : : count2 = count;
475 : :
476 [ # # ]: 0 : if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
477 [ # # ]: 0 : BUG_ON(flex_gd->count > 1);
478 : 0 : continue;
479 : : }
480 : :
481 : 0 : err = extend_or_restart_transaction(handle, 1);
482 [ # # ]: 0 : if (err)
483 : 0 : return err;
484 : :
485 : 0 : bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
486 [ # # ]: 0 : if (unlikely(!bh))
487 : : return -ENOMEM;
488 : :
489 : : BUFFER_TRACE(bh, "get_write_access");
490 : 0 : err = ext4_journal_get_write_access(handle, bh);
491 [ # # ]: 0 : if (err) {
492 : : brelse(bh);
493 : 0 : return err;
494 : : }
495 : : ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n",
496 : : first_cluster, first_cluster - start, count2);
497 : 0 : ext4_set_bits(bh->b_data, first_cluster - start, count2);
498 : :
499 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
500 : : brelse(bh);
501 [ # # ]: 0 : if (unlikely(err))
502 : 0 : return err;
503 : : }
504 : :
505 : : return 0;
506 : : }
507 : :
508 : : /*
509 : : * Set up the block and inode bitmaps, and the inode table for the new groups.
510 : : * This doesn't need to be part of the main transaction, since we are only
511 : : * changing blocks outside the actual filesystem. We still do journaling to
512 : : * ensure the recovery is correct in case of a failure just after resize.
513 : : * If any part of this fails, we simply abort the resize.
514 : : *
515 : : * setup_new_flex_group_blocks handles a flex group as follow:
516 : : * 1. copy super block and GDT, and initialize group tables if necessary.
517 : : * In this step, we only set bits in blocks bitmaps for blocks taken by
518 : : * super block and GDT.
519 : : * 2. allocate group tables in block bitmaps, that is, set bits in block
520 : : * bitmap for blocks taken by group tables.
521 : : */
522 : 0 : static int setup_new_flex_group_blocks(struct super_block *sb,
523 : : struct ext4_new_flex_group_data *flex_gd)
524 : : {
525 : 0 : int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
526 : : ext4_fsblk_t start;
527 : : ext4_fsblk_t block;
528 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
529 : 0 : struct ext4_super_block *es = sbi->s_es;
530 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
531 : 0 : __u16 *bg_flags = flex_gd->bg_flags;
532 : : handle_t *handle;
533 : : ext4_group_t group, count;
534 : : struct buffer_head *bh = NULL;
535 : : int reserved_gdb, i, j, err = 0, err2;
536 : : int meta_bg;
537 : :
538 [ # # # # : 0 : BUG_ON(!flex_gd->count || !group_data ||
# # # # ]
539 : : group_data[0].group != sbi->s_groups_count);
540 : :
541 : 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
542 : 0 : meta_bg = ext4_has_feature_meta_bg(sb);
543 : :
544 : : /* This transaction may be extended/restarted along the way */
545 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
546 [ # # ]: 0 : if (IS_ERR(handle))
547 : 0 : return PTR_ERR(handle);
548 : :
549 : 0 : group = group_data[0].group;
550 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++, group++) {
551 : : unsigned long gdblocks;
552 : : ext4_grpblk_t overhead;
553 : :
554 : 0 : gdblocks = ext4_bg_num_gdb(sb, group);
555 : : start = ext4_group_first_block_no(sb, group);
556 : :
557 [ # # # # ]: 0 : if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
558 : : goto handle_itb;
559 : :
560 [ # # ]: 0 : if (meta_bg == 1) {
561 : : ext4_group_t first_group;
562 : : first_group = ext4_meta_bg_first_group(sb, group);
563 [ # # # # ]: 0 : if (first_group != group + 1 &&
564 : 0 : first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
565 : : goto handle_itb;
566 : : }
567 : :
568 : 0 : block = start + ext4_bg_has_super(sb, group);
569 : : /* Copy all of the GDT blocks into the backup in this group */
570 [ # # ]: 0 : for (j = 0; j < gdblocks; j++, block++) {
571 : : struct buffer_head *gdb;
572 : :
573 : : ext4_debug("update backup group %#04llx\n", block);
574 : 0 : err = extend_or_restart_transaction(handle, 1);
575 [ # # ]: 0 : if (err)
576 : : goto out;
577 : :
578 : : gdb = sb_getblk(sb, block);
579 [ # # ]: 0 : if (unlikely(!gdb)) {
580 : : err = -ENOMEM;
581 : : goto out;
582 : : }
583 : :
584 : : BUFFER_TRACE(gdb, "get_write_access");
585 : 0 : err = ext4_journal_get_write_access(handle, gdb);
586 [ # # ]: 0 : if (err) {
587 : : brelse(gdb);
588 : : goto out;
589 : : }
590 : 0 : memcpy(gdb->b_data, sbi_array_rcu_deref(sbi,
591 : 0 : s_group_desc, j)->b_data, gdb->b_size);
592 : : set_buffer_uptodate(gdb);
593 : :
594 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb);
595 [ # # ]: 0 : if (unlikely(err)) {
596 : : brelse(gdb);
597 : : goto out;
598 : : }
599 : : brelse(gdb);
600 : : }
601 : :
602 : : /* Zero out all of the reserved backup group descriptor
603 : : * table blocks
604 : : */
605 [ # # ]: 0 : if (ext4_bg_has_super(sb, group)) {
606 : 0 : err = sb_issue_zeroout(sb, gdblocks + start + 1,
607 : : reserved_gdb, GFP_NOFS);
608 [ # # ]: 0 : if (err)
609 : : goto out;
610 : : }
611 : :
612 : : handle_itb:
613 : : /* Initialize group tables of the grop @group */
614 [ # # ]: 0 : if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
615 : : goto handle_bb;
616 : :
617 : : /* Zero out all of the inode table blocks */
618 : 0 : block = group_data[i].inode_table;
619 : : ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
620 : : block, sbi->s_itb_per_group);
621 : 0 : err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
622 : : GFP_NOFS);
623 [ # # ]: 0 : if (err)
624 : : goto out;
625 : :
626 : : handle_bb:
627 [ # # ]: 0 : if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
628 : : goto handle_ib;
629 : :
630 : : /* Initialize block bitmap of the @group */
631 : 0 : block = group_data[i].block_bitmap;
632 : 0 : err = extend_or_restart_transaction(handle, 1);
633 [ # # ]: 0 : if (err)
634 : : goto out;
635 : :
636 : 0 : bh = bclean(handle, sb, block);
637 [ # # ]: 0 : if (IS_ERR(bh)) {
638 : : err = PTR_ERR(bh);
639 : 0 : goto out;
640 : : }
641 : 0 : overhead = ext4_group_overhead_blocks(sb, group);
642 [ # # ]: 0 : if (overhead != 0) {
643 : : ext4_debug("mark backup superblock %#04llx (+0)\n",
644 : : start);
645 : 0 : ext4_set_bits(bh->b_data, 0,
646 : 0 : EXT4_NUM_B2C(sbi, overhead));
647 : : }
648 : 0 : ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count),
649 : 0 : sb->s_blocksize * 8, bh->b_data);
650 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
651 : : brelse(bh);
652 [ # # ]: 0 : if (err)
653 : : goto out;
654 : :
655 : : handle_ib:
656 [ # # ]: 0 : if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
657 : 0 : continue;
658 : :
659 : : /* Initialize inode bitmap of the @group */
660 : 0 : block = group_data[i].inode_bitmap;
661 : 0 : err = extend_or_restart_transaction(handle, 1);
662 [ # # ]: 0 : if (err)
663 : : goto out;
664 : : /* Mark unused entries in inode bitmap used */
665 : 0 : bh = bclean(handle, sb, block);
666 [ # # ]: 0 : if (IS_ERR(bh)) {
667 : : err = PTR_ERR(bh);
668 : 0 : goto out;
669 : : }
670 : :
671 : 0 : ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
672 : 0 : sb->s_blocksize * 8, bh->b_data);
673 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
674 : : brelse(bh);
675 [ # # ]: 0 : if (err)
676 : : goto out;
677 : : }
678 : :
679 : : /* Mark group tables in block bitmap */
680 [ # # ]: 0 : for (j = 0; j < GROUP_TABLE_COUNT; j++) {
681 : 0 : count = group_table_count[j];
682 : 0 : start = (&group_data[0].block_bitmap)[j];
683 : : block = start;
684 [ # # ]: 0 : for (i = 1; i < flex_gd->count; i++) {
685 : 0 : block += group_table_count[j];
686 [ # # ]: 0 : if (block == (&group_data[i].block_bitmap)[j]) {
687 : 0 : count += group_table_count[j];
688 : 0 : continue;
689 : : }
690 : 0 : err = set_flexbg_block_bitmap(sb, handle,
691 : : flex_gd,
692 : 0 : EXT4_B2C(sbi, start),
693 : 0 : EXT4_B2C(sbi,
694 : : start + count
695 : : - 1));
696 [ # # ]: 0 : if (err)
697 : : goto out;
698 : : count = group_table_count[j];
699 : 0 : start = (&group_data[i].block_bitmap)[j];
700 : : block = start;
701 : : }
702 : :
703 [ # # ]: 0 : if (count) {
704 : 0 : err = set_flexbg_block_bitmap(sb, handle,
705 : : flex_gd,
706 : 0 : EXT4_B2C(sbi, start),
707 : 0 : EXT4_B2C(sbi,
708 : : start + count
709 : : - 1));
710 [ # # ]: 0 : if (err)
711 : : goto out;
712 : : }
713 : : }
714 : :
715 : : out:
716 : 0 : err2 = ext4_journal_stop(handle);
717 [ # # ]: 0 : if (err2 && !err)
718 : : err = err2;
719 : :
720 : 0 : return err;
721 : : }
722 : :
723 : : /*
724 : : * Iterate through the groups which hold BACKUP superblock/GDT copies in an
725 : : * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before
726 : : * calling this for the first time. In a sparse filesystem it will be the
727 : : * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
728 : : * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
729 : : */
730 : : static unsigned ext4_list_backups(struct super_block *sb, unsigned *three,
731 : : unsigned *five, unsigned *seven)
732 : : {
733 : : unsigned *min = three;
734 : : int mult = 3;
735 : : unsigned ret;
736 : :
737 [ # # # # : 0 : if (!ext4_has_feature_sparse_super(sb)) {
# # ]
738 : 0 : ret = *min;
739 : 0 : *min += 1;
740 : : return ret;
741 : : }
742 : :
743 [ # # # # : 0 : if (*five < *min) {
# # ]
744 : : min = five;
745 : : mult = 5;
746 : : }
747 [ # # # # : 0 : if (*seven < *min) {
# # ]
748 : : min = seven;
749 : : mult = 7;
750 : : }
751 : :
752 : 0 : ret = *min;
753 : 0 : *min *= mult;
754 : :
755 : : return ret;
756 : : }
757 : :
758 : : /*
759 : : * Check that all of the backup GDT blocks are held in the primary GDT block.
760 : : * It is assumed that they are stored in group order. Returns the number of
761 : : * groups in current filesystem that have BACKUPS, or -ve error code.
762 : : */
763 : 0 : static int verify_reserved_gdb(struct super_block *sb,
764 : : ext4_group_t end,
765 : : struct buffer_head *primary)
766 : : {
767 : 0 : const ext4_fsblk_t blk = primary->b_blocknr;
768 : 0 : unsigned three = 1;
769 : 0 : unsigned five = 5;
770 : 0 : unsigned seven = 7;
771 : : unsigned grp;
772 : 0 : __le32 *p = (__le32 *)primary->b_data;
773 : : int gdbackups = 0;
774 : :
775 [ # # ]: 0 : while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
776 [ # # ]: 0 : if (le32_to_cpu(*p++) !=
777 : 0 : grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
778 : 0 : ext4_warning(sb, "reserved GDT %llu"
779 : : " missing grp %d (%llu)",
780 : : blk, grp,
781 : : grp *
782 : : (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
783 : : blk);
784 : 0 : return -EINVAL;
785 : : }
786 [ # # ]: 0 : if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
787 : : return -EFBIG;
788 : : }
789 : :
790 : 0 : return gdbackups;
791 : : }
792 : :
793 : : /*
794 : : * Called when we need to bring a reserved group descriptor table block into
795 : : * use from the resize inode. The primary copy of the new GDT block currently
796 : : * is an indirect block (under the double indirect block in the resize inode).
797 : : * The new backup GDT blocks will be stored as leaf blocks in this indirect
798 : : * block, in group order. Even though we know all the block numbers we need,
799 : : * we check to ensure that the resize inode has actually reserved these blocks.
800 : : *
801 : : * Don't need to update the block bitmaps because the blocks are still in use.
802 : : *
803 : : * We get all of the error cases out of the way, so that we are sure to not
804 : : * fail once we start modifying the data on disk, because JBD has no rollback.
805 : : */
806 : 0 : static int add_new_gdb(handle_t *handle, struct inode *inode,
807 : : ext4_group_t group)
808 : : {
809 : 0 : struct super_block *sb = inode->i_sb;
810 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
811 : 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
812 : 0 : ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
813 : : struct buffer_head **o_group_desc, **n_group_desc = NULL;
814 : : struct buffer_head *dind = NULL;
815 : : struct buffer_head *gdb_bh = NULL;
816 : : int gdbackups;
817 : 0 : struct ext4_iloc iloc = { .bh = NULL };
818 : : __le32 *data;
819 : : int err;
820 : :
821 [ # # ]: 0 : if (test_opt(sb, DEBUG))
822 : 0 : printk(KERN_DEBUG
823 : : "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
824 : : gdb_num);
825 : :
826 : 0 : gdb_bh = ext4_sb_bread(sb, gdblock, 0);
827 [ # # ]: 0 : if (IS_ERR(gdb_bh))
828 : 0 : return PTR_ERR(gdb_bh);
829 : :
830 : 0 : gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
831 [ # # ]: 0 : if (gdbackups < 0) {
832 : : err = gdbackups;
833 : : goto errout;
834 : : }
835 : :
836 : : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
837 : 0 : dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0);
838 [ # # ]: 0 : if (IS_ERR(dind)) {
839 : : err = PTR_ERR(dind);
840 : : dind = NULL;
841 : 0 : goto errout;
842 : : }
843 : :
844 : 0 : data = (__le32 *)dind->b_data;
845 [ # # ]: 0 : if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
846 : 0 : ext4_warning(sb, "new group %u GDT block %llu not reserved",
847 : : group, gdblock);
848 : : err = -EINVAL;
849 : 0 : goto errout;
850 : : }
851 : :
852 : : BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
853 : 0 : err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
854 [ # # ]: 0 : if (unlikely(err))
855 : : goto errout;
856 : :
857 : : BUFFER_TRACE(gdb_bh, "get_write_access");
858 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
859 [ # # ]: 0 : if (unlikely(err))
860 : : goto errout;
861 : :
862 : : BUFFER_TRACE(dind, "get_write_access");
863 : 0 : err = ext4_journal_get_write_access(handle, dind);
864 [ # # ]: 0 : if (unlikely(err))
865 [ # # ]: 0 : ext4_std_error(sb, err);
866 : :
867 : : /* ext4_reserve_inode_write() gets a reference on the iloc */
868 : 0 : err = ext4_reserve_inode_write(handle, inode, &iloc);
869 [ # # ]: 0 : if (unlikely(err))
870 : : goto errout;
871 : :
872 : 0 : n_group_desc = ext4_kvmalloc((gdb_num + 1) *
873 : : sizeof(struct buffer_head *),
874 : : GFP_NOFS);
875 [ # # ]: 0 : if (!n_group_desc) {
876 : : err = -ENOMEM;
877 : 0 : ext4_warning(sb, "not enough memory for %lu groups",
878 : : gdb_num + 1);
879 : 0 : goto errout;
880 : : }
881 : :
882 : : /*
883 : : * Finally, we have all of the possible failures behind us...
884 : : *
885 : : * Remove new GDT block from inode double-indirect block and clear out
886 : : * the new GDT block for use (which also "frees" the backup GDT blocks
887 : : * from the reserved inode). We don't need to change the bitmaps for
888 : : * these blocks, because they are marked as in-use from being in the
889 : : * reserved inode, and will become GDT blocks (primary and backup).
890 : : */
891 : 0 : data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
892 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, dind);
893 [ # # ]: 0 : if (unlikely(err)) {
894 [ # # ]: 0 : ext4_std_error(sb, err);
895 : : goto errout;
896 : : }
897 : 0 : inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >>
898 : 0 : (9 - EXT4_SB(sb)->s_cluster_bits);
899 : 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
900 : 0 : memset(gdb_bh->b_data, 0, sb->s_blocksize);
901 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
902 [ # # ]: 0 : if (unlikely(err)) {
903 [ # # ]: 0 : ext4_std_error(sb, err);
904 : 0 : iloc.bh = NULL;
905 : 0 : goto errout;
906 : : }
907 : : brelse(dind);
908 : :
909 : : rcu_read_lock();
910 : 0 : o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc);
911 : 0 : memcpy(n_group_desc, o_group_desc,
912 : 0 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
913 : : rcu_read_unlock();
914 : 0 : n_group_desc[gdb_num] = gdb_bh;
915 : 0 : rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc);
916 : 0 : EXT4_SB(sb)->s_gdb_count++;
917 : 0 : ext4_kvfree_array_rcu(o_group_desc);
918 : :
919 : : le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
920 : 0 : err = ext4_handle_dirty_super(handle, sb);
921 [ # # ]: 0 : if (err)
922 [ # # ]: 0 : ext4_std_error(sb, err);
923 : 0 : return err;
924 : : errout:
925 : 0 : kvfree(n_group_desc);
926 : 0 : brelse(iloc.bh);
927 : : brelse(dind);
928 : : brelse(gdb_bh);
929 : :
930 : : ext4_debug("leaving with error %d\n", err);
931 : 0 : return err;
932 : : }
933 : :
934 : : /*
935 : : * add_new_gdb_meta_bg is the sister of add_new_gdb.
936 : : */
937 : 0 : static int add_new_gdb_meta_bg(struct super_block *sb,
938 : : handle_t *handle, ext4_group_t group) {
939 : : ext4_fsblk_t gdblock;
940 : : struct buffer_head *gdb_bh;
941 : : struct buffer_head **o_group_desc, **n_group_desc;
942 : 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
943 : : int err;
944 : :
945 : 0 : gdblock = ext4_meta_bg_first_block_no(sb, group) +
946 : 0 : ext4_bg_has_super(sb, group);
947 : 0 : gdb_bh = ext4_sb_bread(sb, gdblock, 0);
948 [ # # ]: 0 : if (IS_ERR(gdb_bh))
949 : 0 : return PTR_ERR(gdb_bh);
950 : 0 : n_group_desc = ext4_kvmalloc((gdb_num + 1) *
951 : : sizeof(struct buffer_head *),
952 : : GFP_NOFS);
953 [ # # ]: 0 : if (!n_group_desc) {
954 : : brelse(gdb_bh);
955 : : err = -ENOMEM;
956 : 0 : ext4_warning(sb, "not enough memory for %lu groups",
957 : : gdb_num + 1);
958 : 0 : return err;
959 : : }
960 : :
961 : : rcu_read_lock();
962 : 0 : o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc);
963 : 0 : memcpy(n_group_desc, o_group_desc,
964 : 0 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
965 : : rcu_read_unlock();
966 : 0 : n_group_desc[gdb_num] = gdb_bh;
967 : :
968 : : BUFFER_TRACE(gdb_bh, "get_write_access");
969 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
970 [ # # ]: 0 : if (err) {
971 : 0 : kvfree(n_group_desc);
972 : : brelse(gdb_bh);
973 : 0 : return err;
974 : : }
975 : :
976 : 0 : rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc);
977 : 0 : EXT4_SB(sb)->s_gdb_count++;
978 : 0 : ext4_kvfree_array_rcu(o_group_desc);
979 : 0 : return err;
980 : : }
981 : :
982 : : /*
983 : : * Called when we are adding a new group which has a backup copy of each of
984 : : * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
985 : : * We need to add these reserved backup GDT blocks to the resize inode, so
986 : : * that they are kept for future resizing and not allocated to files.
987 : : *
988 : : * Each reserved backup GDT block will go into a different indirect block.
989 : : * The indirect blocks are actually the primary reserved GDT blocks,
990 : : * so we know in advance what their block numbers are. We only get the
991 : : * double-indirect block to verify it is pointing to the primary reserved
992 : : * GDT blocks so we don't overwrite a data block by accident. The reserved
993 : : * backup GDT blocks are stored in their reserved primary GDT block.
994 : : */
995 : 0 : static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
996 : : ext4_group_t group)
997 : : {
998 : 0 : struct super_block *sb = inode->i_sb;
999 : 0 : int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
1000 : 0 : int cluster_bits = EXT4_SB(sb)->s_cluster_bits;
1001 : : struct buffer_head **primary;
1002 : : struct buffer_head *dind;
1003 : : struct ext4_iloc iloc;
1004 : : ext4_fsblk_t blk;
1005 : : __le32 *data, *end;
1006 : : int gdbackups = 0;
1007 : : int res, i;
1008 : : int err;
1009 : :
1010 : 0 : primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS);
1011 [ # # ]: 0 : if (!primary)
1012 : : return -ENOMEM;
1013 : :
1014 : : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
1015 : 0 : dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0);
1016 [ # # ]: 0 : if (IS_ERR(dind)) {
1017 : : err = PTR_ERR(dind);
1018 : : dind = NULL;
1019 : 0 : goto exit_free;
1020 : : }
1021 : :
1022 : 0 : blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
1023 : 0 : data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
1024 : 0 : EXT4_ADDR_PER_BLOCK(sb));
1025 : 0 : end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
1026 : :
1027 : : /* Get each reserved primary GDT block and verify it holds backups */
1028 [ # # ]: 0 : for (res = 0; res < reserved_gdb; res++, blk++) {
1029 [ # # ]: 0 : if (le32_to_cpu(*data) != blk) {
1030 : 0 : ext4_warning(sb, "reserved block %llu"
1031 : : " not at offset %ld",
1032 : : blk,
1033 : : (long)(data - (__le32 *)dind->b_data));
1034 : : err = -EINVAL;
1035 : 0 : goto exit_bh;
1036 : : }
1037 : 0 : primary[res] = ext4_sb_bread(sb, blk, 0);
1038 [ # # ]: 0 : if (IS_ERR(primary[res])) {
1039 : 0 : err = PTR_ERR(primary[res]);
1040 : 0 : primary[res] = NULL;
1041 : 0 : goto exit_bh;
1042 : : }
1043 : 0 : gdbackups = verify_reserved_gdb(sb, group, primary[res]);
1044 [ # # ]: 0 : if (gdbackups < 0) {
1045 : 0 : brelse(primary[res]);
1046 : 0 : err = gdbackups;
1047 : 0 : goto exit_bh;
1048 : : }
1049 [ # # ]: 0 : if (++data >= end)
1050 : 0 : data = (__le32 *)dind->b_data;
1051 : : }
1052 : :
1053 [ # # ]: 0 : for (i = 0; i < reserved_gdb; i++) {
1054 : : BUFFER_TRACE(primary[i], "get_write_access");
1055 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, primary[i])))
1056 : : goto exit_bh;
1057 : : }
1058 : :
1059 [ # # ]: 0 : if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
1060 : : goto exit_bh;
1061 : :
1062 : : /*
1063 : : * Finally we can add each of the reserved backup GDT blocks from
1064 : : * the new group to its reserved primary GDT block.
1065 : : */
1066 : 0 : blk = group * EXT4_BLOCKS_PER_GROUP(sb);
1067 [ # # ]: 0 : for (i = 0; i < reserved_gdb; i++) {
1068 : : int err2;
1069 : 0 : data = (__le32 *)primary[i]->b_data;
1070 : : /* printk("reserving backup %lu[%u] = %lu\n",
1071 : : primary[i]->b_blocknr, gdbackups,
1072 : : blk + primary[i]->b_blocknr); */
1073 : 0 : data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
1074 : 0 : err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
1075 [ # # ]: 0 : if (!err)
1076 : : err = err2;
1077 : : }
1078 : :
1079 : 0 : inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits);
1080 : 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
1081 : :
1082 : : exit_bh:
1083 [ # # ]: 0 : while (--res >= 0)
1084 : 0 : brelse(primary[res]);
1085 : : brelse(dind);
1086 : :
1087 : : exit_free:
1088 : 0 : kfree(primary);
1089 : :
1090 : 0 : return err;
1091 : : }
1092 : :
1093 : : /*
1094 : : * Update the backup copies of the ext4 metadata. These don't need to be part
1095 : : * of the main resize transaction, because e2fsck will re-write them if there
1096 : : * is a problem (basically only OOM will cause a problem). However, we
1097 : : * _should_ update the backups if possible, in case the primary gets trashed
1098 : : * for some reason and we need to run e2fsck from a backup superblock. The
1099 : : * important part is that the new block and inode counts are in the backup
1100 : : * superblocks, and the location of the new group metadata in the GDT backups.
1101 : : *
1102 : : * We do not need take the s_resize_lock for this, because these
1103 : : * blocks are not otherwise touched by the filesystem code when it is
1104 : : * mounted. We don't need to worry about last changing from
1105 : : * sbi->s_groups_count, because the worst that can happen is that we
1106 : : * do not copy the full number of backups at this time. The resize
1107 : : * which changed s_groups_count will backup again.
1108 : : */
1109 : 0 : static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
1110 : : int size, int meta_bg)
1111 : : {
1112 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1113 : : ext4_group_t last;
1114 : 0 : const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
1115 : 0 : unsigned three = 1;
1116 : 0 : unsigned five = 5;
1117 : 0 : unsigned seven = 7;
1118 : : ext4_group_t group = 0;
1119 : 0 : int rest = sb->s_blocksize - size;
1120 : : handle_t *handle;
1121 : : int err = 0, err2;
1122 : :
1123 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
1124 [ # # ]: 0 : if (IS_ERR(handle)) {
1125 : : group = 1;
1126 : : err = PTR_ERR(handle);
1127 : 0 : goto exit_err;
1128 : : }
1129 : :
1130 [ # # ]: 0 : if (meta_bg == 0) {
1131 : : group = ext4_list_backups(sb, &three, &five, &seven);
1132 : 0 : last = sbi->s_groups_count;
1133 : : } else {
1134 : 0 : group = ext4_get_group_number(sb, blk_off) + 1;
1135 : 0 : last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
1136 : : }
1137 : :
1138 [ # # ]: 0 : while (group < sbi->s_groups_count) {
1139 : : struct buffer_head *bh;
1140 : : ext4_fsblk_t backup_block;
1141 : :
1142 : : /* Out of journal space, and can't get more - abort - so sad */
1143 [ # # # # ]: 0 : if (ext4_handle_valid(handle) &&
1144 [ # # ]: 0 : handle->h_buffer_credits == 0 &&
1145 [ # # ]: 0 : ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) &&
1146 : : (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA)))
1147 : : break;
1148 : :
1149 [ # # ]: 0 : if (meta_bg == 0)
1150 : 0 : backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
1151 : : else
1152 : 0 : backup_block = (ext4_group_first_block_no(sb, group) +
1153 : 0 : ext4_bg_has_super(sb, group));
1154 : :
1155 : : bh = sb_getblk(sb, backup_block);
1156 [ # # ]: 0 : if (unlikely(!bh)) {
1157 : : err = -ENOMEM;
1158 : : break;
1159 : : }
1160 : : ext4_debug("update metadata backup %llu(+%llu)\n",
1161 : : backup_block, backup_block -
1162 : : ext4_group_first_block_no(sb, group));
1163 : : BUFFER_TRACE(bh, "get_write_access");
1164 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, bh))) {
1165 : : brelse(bh);
1166 : : break;
1167 : : }
1168 : 0 : lock_buffer(bh);
1169 : 0 : memcpy(bh->b_data, data, size);
1170 [ # # ]: 0 : if (rest)
1171 : 0 : memset(bh->b_data + size, 0, rest);
1172 : : set_buffer_uptodate(bh);
1173 : 0 : unlock_buffer(bh);
1174 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
1175 [ # # ]: 0 : if (unlikely(err))
1176 [ # # ]: 0 : ext4_std_error(sb, err);
1177 : : brelse(bh);
1178 : :
1179 [ # # ]: 0 : if (meta_bg == 0)
1180 : : group = ext4_list_backups(sb, &three, &five, &seven);
1181 [ # # ]: 0 : else if (group == last)
1182 : : break;
1183 : : else
1184 : : group = last;
1185 : : }
1186 [ # # # # ]: 0 : if ((err2 = ext4_journal_stop(handle)) && !err)
1187 : : err = err2;
1188 : :
1189 : : /*
1190 : : * Ugh! Need to have e2fsck write the backup copies. It is too
1191 : : * late to revert the resize, we shouldn't fail just because of
1192 : : * the backup copies (they are only needed in case of corruption).
1193 : : *
1194 : : * However, if we got here we have a journal problem too, so we
1195 : : * can't really start a transaction to mark the superblock.
1196 : : * Chicken out and just set the flag on the hope it will be written
1197 : : * to disk, and if not - we will simply wait until next fsck.
1198 : : */
1199 : : exit_err:
1200 [ # # ]: 0 : if (err) {
1201 : 0 : ext4_warning(sb, "can't update backup for group %u (err %d), "
1202 : : "forcing fsck on next reboot", group, err);
1203 : 0 : sbi->s_mount_state &= ~EXT4_VALID_FS;
1204 : 0 : sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1205 : 0 : mark_buffer_dirty(sbi->s_sbh);
1206 : : }
1207 : 0 : }
1208 : :
1209 : : /*
1210 : : * ext4_add_new_descs() adds @count group descriptor of groups
1211 : : * starting at @group
1212 : : *
1213 : : * @handle: journal handle
1214 : : * @sb: super block
1215 : : * @group: the group no. of the first group desc to be added
1216 : : * @resize_inode: the resize inode
1217 : : * @count: number of group descriptors to be added
1218 : : */
1219 : 0 : static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
1220 : : ext4_group_t group, struct inode *resize_inode,
1221 : : ext4_group_t count)
1222 : : {
1223 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1224 : 0 : struct ext4_super_block *es = sbi->s_es;
1225 : : struct buffer_head *gdb_bh;
1226 : : int i, gdb_off, gdb_num, err = 0;
1227 : : int meta_bg;
1228 : :
1229 : : meta_bg = ext4_has_feature_meta_bg(sb);
1230 [ # # ]: 0 : for (i = 0; i < count; i++, group++) {
1231 : 0 : int reserved_gdb = ext4_bg_has_super(sb, group) ?
1232 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1233 : :
1234 : 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1235 : 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1236 : :
1237 : : /*
1238 : : * We will only either add reserved group blocks to a backup group
1239 : : * or remove reserved blocks for the first group in a new group block.
1240 : : * Doing both would be mean more complex code, and sane people don't
1241 : : * use non-sparse filesystems anymore. This is already checked above.
1242 : : */
1243 [ # # ]: 0 : if (gdb_off) {
1244 : 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
1245 : : gdb_num);
1246 : : BUFFER_TRACE(gdb_bh, "get_write_access");
1247 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
1248 : :
1249 [ # # # # ]: 0 : if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
1250 : 0 : err = reserve_backup_gdb(handle, resize_inode, group);
1251 [ # # ]: 0 : } else if (meta_bg != 0) {
1252 : 0 : err = add_new_gdb_meta_bg(sb, handle, group);
1253 : : } else {
1254 : 0 : err = add_new_gdb(handle, resize_inode, group);
1255 : : }
1256 [ # # ]: 0 : if (err)
1257 : : break;
1258 : : }
1259 : 0 : return err;
1260 : : }
1261 : :
1262 : 0 : static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
1263 : : {
1264 : : struct buffer_head *bh = sb_getblk(sb, block);
1265 [ # # ]: 0 : if (unlikely(!bh))
1266 : : return NULL;
1267 [ # # ]: 0 : if (!bh_uptodate_or_lock(bh)) {
1268 [ # # ]: 0 : if (bh_submit_read(bh) < 0) {
1269 : : brelse(bh);
1270 : : return NULL;
1271 : : }
1272 : : }
1273 : :
1274 : 0 : return bh;
1275 : : }
1276 : :
1277 : 0 : static int ext4_set_bitmap_checksums(struct super_block *sb,
1278 : : ext4_group_t group,
1279 : : struct ext4_group_desc *gdp,
1280 : : struct ext4_new_group_data *group_data)
1281 : : {
1282 : : struct buffer_head *bh;
1283 : :
1284 [ # # ]: 0 : if (!ext4_has_metadata_csum(sb))
1285 : : return 0;
1286 : :
1287 : 0 : bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
1288 [ # # ]: 0 : if (!bh)
1289 : : return -EIO;
1290 : 0 : ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
1291 : 0 : EXT4_INODES_PER_GROUP(sb) / 8);
1292 : : brelse(bh);
1293 : :
1294 : 0 : bh = ext4_get_bitmap(sb, group_data->block_bitmap);
1295 [ # # ]: 0 : if (!bh)
1296 : : return -EIO;
1297 : 0 : ext4_block_bitmap_csum_set(sb, group, gdp, bh);
1298 : : brelse(bh);
1299 : :
1300 : : return 0;
1301 : : }
1302 : :
1303 : : /*
1304 : : * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
1305 : : */
1306 : 0 : static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
1307 : : struct ext4_new_flex_group_data *flex_gd)
1308 : : {
1309 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1310 : : struct ext4_group_desc *gdp;
1311 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1312 : : struct buffer_head *gdb_bh;
1313 : : ext4_group_t group;
1314 : 0 : __u16 *bg_flags = flex_gd->bg_flags;
1315 : : int i, gdb_off, gdb_num, err = 0;
1316 : :
1317 : :
1318 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
1319 : 0 : group = group_data->group;
1320 : :
1321 : 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1322 : 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1323 : :
1324 : : /*
1325 : : * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
1326 : : */
1327 : 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num);
1328 : : /* Update group descriptor block for new group */
1329 : 0 : gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
1330 : 0 : gdb_off * EXT4_DESC_SIZE(sb));
1331 : :
1332 : 0 : memset(gdp, 0, EXT4_DESC_SIZE(sb));
1333 : 0 : ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
1334 : 0 : ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
1335 : 0 : err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
1336 [ # # ]: 0 : if (err) {
1337 [ # # ]: 0 : ext4_std_error(sb, err);
1338 : : break;
1339 : : }
1340 : :
1341 : 0 : ext4_inode_table_set(sb, gdp, group_data->inode_table);
1342 : 0 : ext4_free_group_clusters_set(sb, gdp,
1343 : : group_data->free_clusters_count);
1344 : 0 : ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
1345 [ # # ]: 0 : if (ext4_has_group_desc_csum(sb))
1346 : 0 : ext4_itable_unused_set(sb, gdp,
1347 : 0 : EXT4_INODES_PER_GROUP(sb));
1348 : 0 : gdp->bg_flags = cpu_to_le16(*bg_flags);
1349 : 0 : ext4_group_desc_csum_set(sb, group, gdp);
1350 : :
1351 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
1352 [ # # ]: 0 : if (unlikely(err)) {
1353 [ # # ]: 0 : ext4_std_error(sb, err);
1354 : : break;
1355 : : }
1356 : :
1357 : : /*
1358 : : * We can allocate memory for mb_alloc based on the new group
1359 : : * descriptor
1360 : : */
1361 : 0 : err = ext4_mb_add_groupinfo(sb, group, gdp);
1362 [ # # ]: 0 : if (err)
1363 : : break;
1364 : : }
1365 : 0 : return err;
1366 : : }
1367 : :
1368 : : /*
1369 : : * ext4_update_super() updates the super block so that the newly added
1370 : : * groups can be seen by the filesystem.
1371 : : *
1372 : : * @sb: super block
1373 : : * @flex_gd: new added groups
1374 : : */
1375 : 0 : static void ext4_update_super(struct super_block *sb,
1376 : : struct ext4_new_flex_group_data *flex_gd)
1377 : : {
1378 : : ext4_fsblk_t blocks_count = 0;
1379 : : ext4_fsblk_t free_blocks = 0;
1380 : : ext4_fsblk_t reserved_blocks = 0;
1381 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1382 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1383 : 0 : struct ext4_super_block *es = sbi->s_es;
1384 : : int i;
1385 : :
1386 [ # # # # ]: 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
1387 : : /*
1388 : : * Make the new blocks and inodes valid next. We do this before
1389 : : * increasing the group count so that once the group is enabled,
1390 : : * all of its blocks and inodes are already valid.
1391 : : *
1392 : : * We always allocate group-by-group, then block-by-block or
1393 : : * inode-by-inode within a group, so enabling these
1394 : : * blocks/inodes before the group is live won't actually let us
1395 : : * allocate the new space yet.
1396 : : */
1397 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
1398 : 0 : blocks_count += group_data[i].blocks_count;
1399 : 0 : free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count);
1400 : : }
1401 : :
1402 : 0 : reserved_blocks = ext4_r_blocks_count(es) * 100;
1403 : 0 : reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
1404 : 0 : reserved_blocks *= blocks_count;
1405 : 0 : do_div(reserved_blocks, 100);
1406 : :
1407 : 0 : ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
1408 : 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
1409 : 0 : le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1410 : 0 : flex_gd->count);
1411 : 0 : le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1412 : 0 : flex_gd->count);
1413 : :
1414 : : ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
1415 : : /*
1416 : : * We need to protect s_groups_count against other CPUs seeing
1417 : : * inconsistent state in the superblock.
1418 : : *
1419 : : * The precise rules we use are:
1420 : : *
1421 : : * * Writers must perform a smp_wmb() after updating all
1422 : : * dependent data and before modifying the groups count
1423 : : *
1424 : : * * Readers must perform an smp_rmb() after reading the groups
1425 : : * count and before reading any dependent data.
1426 : : *
1427 : : * NB. These rules can be relaxed when checking the group count
1428 : : * while freeing data, as we can only allocate from a block
1429 : : * group after serialising against the group count, and we can
1430 : : * only then free after serialising in turn against that
1431 : : * allocation.
1432 : : */
1433 : 0 : smp_wmb();
1434 : :
1435 : : /* Update the global fs size fields */
1436 : 0 : sbi->s_groups_count += flex_gd->count;
1437 : 0 : sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
1438 : : (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
1439 : :
1440 : : /* Update the reserved block counts only once the new group is
1441 : : * active. */
1442 : 0 : ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
1443 : : reserved_blocks);
1444 : :
1445 : : /* Update the free space counts */
1446 : 0 : percpu_counter_add(&sbi->s_freeclusters_counter,
1447 : 0 : EXT4_NUM_B2C(sbi, free_blocks));
1448 : 0 : percpu_counter_add(&sbi->s_freeinodes_counter,
1449 : 0 : EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
1450 : :
1451 : : ext4_debug("free blocks count %llu",
1452 : : percpu_counter_read(&sbi->s_freeclusters_counter));
1453 [ # # # # ]: 0 : if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) {
1454 : : ext4_group_t flex_group;
1455 : : struct flex_groups *fg;
1456 : :
1457 : 0 : flex_group = ext4_flex_group(sbi, group_data[0].group);
1458 : 0 : fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
1459 : 0 : atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
1460 : : &fg->free_clusters);
1461 : 0 : atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
1462 : : &fg->free_inodes);
1463 : : }
1464 : :
1465 : : /*
1466 : : * Update the fs overhead information
1467 : : */
1468 : 0 : ext4_calculate_overhead(sb);
1469 : :
1470 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1471 : 0 : printk(KERN_DEBUG "EXT4-fs: added group %u:"
1472 : : "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
1473 : : blocks_count, free_blocks, reserved_blocks);
1474 : 0 : }
1475 : :
1476 : : /* Add a flex group to an fs. Ensure we handle all possible error conditions
1477 : : * _before_ we start modifying the filesystem, because we cannot abort the
1478 : : * transaction and not have it write the data to disk.
1479 : : */
1480 : 0 : static int ext4_flex_group_add(struct super_block *sb,
1481 : : struct inode *resize_inode,
1482 : : struct ext4_new_flex_group_data *flex_gd)
1483 : : {
1484 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1485 : 0 : struct ext4_super_block *es = sbi->s_es;
1486 : : ext4_fsblk_t o_blocks_count;
1487 : : ext4_grpblk_t last;
1488 : : ext4_group_t group;
1489 : : handle_t *handle;
1490 : : unsigned reserved_gdb;
1491 : : int err = 0, err2 = 0, credit;
1492 : :
1493 [ # # # # : 0 : BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
# # # # ]
1494 : :
1495 : 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
1496 : : o_blocks_count = ext4_blocks_count(es);
1497 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1498 [ # # ]: 0 : BUG_ON(last);
1499 : :
1500 : 0 : err = setup_new_flex_group_blocks(sb, flex_gd);
1501 [ # # ]: 0 : if (err)
1502 : : goto exit;
1503 : : /*
1504 : : * We will always be modifying at least the superblock and GDT
1505 : : * blocks. If we are adding a group past the last current GDT block,
1506 : : * we will also modify the inode and the dindirect block. If we
1507 : : * are adding a group with superblock/GDT backups we will also
1508 : : * modify each of the reserved GDT dindirect blocks.
1509 : : */
1510 : : credit = 3; /* sb, resize inode, resize inode dindirect */
1511 : : /* GDT blocks */
1512 : 0 : credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb));
1513 : 0 : credit += reserved_gdb; /* Reserved GDT dindirect blocks */
1514 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
1515 [ # # ]: 0 : if (IS_ERR(handle)) {
1516 : : err = PTR_ERR(handle);
1517 : 0 : goto exit;
1518 : : }
1519 : :
1520 : : BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1521 : 0 : err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1522 [ # # ]: 0 : if (err)
1523 : : goto exit_journal;
1524 : :
1525 : 0 : group = flex_gd->groups[0].group;
1526 [ # # ]: 0 : BUG_ON(group != sbi->s_groups_count);
1527 : 0 : err = ext4_add_new_descs(handle, sb, group,
1528 : : resize_inode, flex_gd->count);
1529 [ # # ]: 0 : if (err)
1530 : : goto exit_journal;
1531 : :
1532 : 0 : err = ext4_setup_new_descs(handle, sb, flex_gd);
1533 [ # # ]: 0 : if (err)
1534 : : goto exit_journal;
1535 : :
1536 : 0 : ext4_update_super(sb, flex_gd);
1537 : :
1538 : 0 : err = ext4_handle_dirty_super(handle, sb);
1539 : :
1540 : : exit_journal:
1541 : 0 : err2 = ext4_journal_stop(handle);
1542 [ # # ]: 0 : if (!err)
1543 : : err = err2;
1544 : :
1545 [ # # ]: 0 : if (!err) {
1546 : 0 : int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1547 : 0 : int gdb_num_end = ((group + flex_gd->count - 1) /
1548 : : EXT4_DESC_PER_BLOCK(sb));
1549 : 0 : int meta_bg = ext4_has_feature_meta_bg(sb);
1550 : : sector_t old_gdb = 0;
1551 : :
1552 : 0 : update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
1553 : : sizeof(struct ext4_super_block), 0);
1554 [ # # ]: 0 : for (; gdb_num <= gdb_num_end; gdb_num++) {
1555 : : struct buffer_head *gdb_bh;
1556 : :
1557 : 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
1558 : : gdb_num);
1559 [ # # ]: 0 : if (old_gdb == gdb_bh->b_blocknr)
1560 : 0 : continue;
1561 : 0 : update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
1562 : 0 : gdb_bh->b_size, meta_bg);
1563 : 0 : old_gdb = gdb_bh->b_blocknr;
1564 : : }
1565 : : }
1566 : : exit:
1567 : 0 : return err;
1568 : : }
1569 : :
1570 : 0 : static int ext4_setup_next_flex_gd(struct super_block *sb,
1571 : : struct ext4_new_flex_group_data *flex_gd,
1572 : : ext4_fsblk_t n_blocks_count,
1573 : : unsigned long flexbg_size)
1574 : : {
1575 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1576 : 0 : struct ext4_super_block *es = sbi->s_es;
1577 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1578 : : ext4_fsblk_t o_blocks_count;
1579 : : ext4_group_t n_group;
1580 : : ext4_group_t group;
1581 : : ext4_group_t last_group;
1582 : : ext4_grpblk_t last;
1583 : : ext4_grpblk_t clusters_per_group;
1584 : : unsigned long i;
1585 : :
1586 : 0 : clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb);
1587 : :
1588 : : o_blocks_count = ext4_blocks_count(es);
1589 : :
1590 [ # # ]: 0 : if (o_blocks_count == n_blocks_count)
1591 : : return 0;
1592 : :
1593 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1594 [ # # ]: 0 : BUG_ON(last);
1595 : 0 : ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
1596 : :
1597 : 0 : last_group = group | (flexbg_size - 1);
1598 [ # # ]: 0 : if (last_group > n_group)
1599 : : last_group = n_group;
1600 : :
1601 : 0 : flex_gd->count = last_group - group + 1;
1602 : :
1603 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
1604 : : int overhead;
1605 : :
1606 : 0 : group_data[i].group = group + i;
1607 : 0 : group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb);
1608 : 0 : overhead = ext4_group_overhead_blocks(sb, group + i);
1609 : 0 : group_data[i].mdata_blocks = overhead;
1610 : 0 : group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb);
1611 [ # # ]: 0 : if (ext4_has_group_desc_csum(sb)) {
1612 : 0 : flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
1613 : : EXT4_BG_INODE_UNINIT;
1614 [ # # ]: 0 : if (!test_opt(sb, INIT_INODE_TABLE))
1615 : 0 : flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
1616 : : } else
1617 : 0 : flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
1618 : : }
1619 : :
1620 [ # # # # ]: 0 : if (last_group == n_group && ext4_has_group_desc_csum(sb))
1621 : : /* We need to initialize block bitmap of last group. */
1622 : 0 : flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
1623 : :
1624 [ # # # # ]: 0 : if ((last_group == n_group) && (last != clusters_per_group - 1)) {
1625 : 0 : group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1);
1626 : 0 : group_data[i - 1].free_clusters_count -= clusters_per_group -
1627 : : last - 1;
1628 : : }
1629 : :
1630 : : return 1;
1631 : : }
1632 : :
1633 : : /* Add group descriptor data to an existing or new group descriptor block.
1634 : : * Ensure we handle all possible error conditions _before_ we start modifying
1635 : : * the filesystem, because we cannot abort the transaction and not have it
1636 : : * write the data to disk.
1637 : : *
1638 : : * If we are on a GDT block boundary, we need to get the reserved GDT block.
1639 : : * Otherwise, we may need to add backup GDT blocks for a sparse group.
1640 : : *
1641 : : * We only need to hold the superblock lock while we are actually adding
1642 : : * in the new group's counts to the superblock. Prior to that we have
1643 : : * not really "added" the group at all. We re-check that we are still
1644 : : * adding in the last group in case things have changed since verifying.
1645 : : */
1646 : 0 : int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
1647 : : {
1648 : : struct ext4_new_flex_group_data flex_gd;
1649 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1650 : 0 : struct ext4_super_block *es = sbi->s_es;
1651 : 0 : int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
1652 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1653 : : struct inode *inode = NULL;
1654 : : int gdb_off;
1655 : : int err;
1656 : 0 : __u16 bg_flags = 0;
1657 : :
1658 : 0 : gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
1659 : :
1660 [ # # # # ]: 0 : if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) {
1661 : 0 : ext4_warning(sb, "Can't resize non-sparse filesystem further");
1662 : 0 : return -EPERM;
1663 : : }
1664 : :
1665 [ # # ]: 0 : if (ext4_blocks_count(es) + input->blocks_count <
1666 : : ext4_blocks_count(es)) {
1667 : 0 : ext4_warning(sb, "blocks_count overflow");
1668 : 0 : return -EINVAL;
1669 : : }
1670 : :
1671 [ # # ]: 0 : if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
1672 : : le32_to_cpu(es->s_inodes_count)) {
1673 : 0 : ext4_warning(sb, "inodes_count overflow");
1674 : 0 : return -EINVAL;
1675 : : }
1676 : :
1677 [ # # ]: 0 : if (reserved_gdb || gdb_off == 0) {
1678 [ # # # # ]: 0 : if (!ext4_has_feature_resize_inode(sb) ||
1679 : 0 : !le16_to_cpu(es->s_reserved_gdt_blocks)) {
1680 : 0 : ext4_warning(sb,
1681 : : "No reserved GDT blocks, can't resize");
1682 : 0 : return -EPERM;
1683 : : }
1684 : 0 : inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL);
1685 [ # # ]: 0 : if (IS_ERR(inode)) {
1686 : 0 : ext4_warning(sb, "Error opening resize inode");
1687 : 0 : return PTR_ERR(inode);
1688 : : }
1689 : : }
1690 : :
1691 : :
1692 : 0 : err = verify_group_input(sb, input);
1693 [ # # ]: 0 : if (err)
1694 : : goto out;
1695 : :
1696 : 0 : err = ext4_alloc_flex_bg_array(sb, input->group + 1);
1697 [ # # ]: 0 : if (err)
1698 : : goto out;
1699 : :
1700 : 0 : err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
1701 [ # # ]: 0 : if (err)
1702 : : goto out;
1703 : :
1704 : 0 : flex_gd.count = 1;
1705 : 0 : flex_gd.groups = input;
1706 : 0 : flex_gd.bg_flags = &bg_flags;
1707 : 0 : err = ext4_flex_group_add(sb, inode, &flex_gd);
1708 : : out:
1709 : 0 : iput(inode);
1710 : 0 : return err;
1711 : : } /* ext4_group_add */
1712 : :
1713 : : /*
1714 : : * extend a group without checking assuming that checking has been done.
1715 : : */
1716 : 0 : static int ext4_group_extend_no_check(struct super_block *sb,
1717 : : ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
1718 : : {
1719 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1720 : : handle_t *handle;
1721 : : int err = 0, err2;
1722 : :
1723 : : /* We will update the superblock, one block bitmap, and
1724 : : * one group descriptor via ext4_group_add_blocks().
1725 : : */
1726 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
1727 [ # # ]: 0 : if (IS_ERR(handle)) {
1728 : : err = PTR_ERR(handle);
1729 : 0 : ext4_warning(sb, "error %d on journal start", err);
1730 : 0 : return err;
1731 : : }
1732 : :
1733 : : BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
1734 : 0 : err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
1735 [ # # ]: 0 : if (err) {
1736 : 0 : ext4_warning(sb, "error %d on journal write access", err);
1737 : 0 : goto errout;
1738 : : }
1739 : :
1740 : 0 : ext4_blocks_count_set(es, o_blocks_count + add);
1741 : 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
1742 : : ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1743 : : o_blocks_count + add);
1744 : : /* We add the blocks to the bitmap and set the group need init bit */
1745 : 0 : err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1746 [ # # ]: 0 : if (err)
1747 : : goto errout;
1748 : 0 : ext4_handle_dirty_super(handle, sb);
1749 : : ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1750 : : o_blocks_count + add);
1751 : : errout:
1752 : 0 : err2 = ext4_journal_stop(handle);
1753 [ # # ]: 0 : if (err2 && !err)
1754 : : err = err2;
1755 : :
1756 [ # # ]: 0 : if (!err) {
1757 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1758 : 0 : printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
1759 : : "blocks\n", ext4_blocks_count(es));
1760 : 0 : update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
1761 : : (char *)es, sizeof(struct ext4_super_block), 0);
1762 : : }
1763 : 0 : return err;
1764 : : }
1765 : :
1766 : : /*
1767 : : * Extend the filesystem to the new number of blocks specified. This entry
1768 : : * point is only used to extend the current filesystem to the end of the last
1769 : : * existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
1770 : : * for emergencies (because it has no dependencies on reserved blocks).
1771 : : *
1772 : : * If we _really_ wanted, we could use default values to call ext4_group_add()
1773 : : * allow the "remount" trick to work for arbitrary resizing, assuming enough
1774 : : * GDT blocks are reserved to grow to the desired size.
1775 : : */
1776 : 0 : int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1777 : : ext4_fsblk_t n_blocks_count)
1778 : : {
1779 : : ext4_fsblk_t o_blocks_count;
1780 : : ext4_grpblk_t last;
1781 : : ext4_grpblk_t add;
1782 : : struct buffer_head *bh;
1783 : : int err;
1784 : : ext4_group_t group;
1785 : :
1786 : : o_blocks_count = ext4_blocks_count(es);
1787 : :
1788 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1789 : 0 : ext4_msg(sb, KERN_DEBUG,
1790 : : "extending last group from %llu to %llu blocks",
1791 : : o_blocks_count, n_blocks_count);
1792 : :
1793 [ # # ]: 0 : if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
1794 : : return 0;
1795 : :
1796 [ # # ]: 0 : if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1797 : 0 : ext4_msg(sb, KERN_ERR,
1798 : : "filesystem too large to resize to %llu blocks safely",
1799 : : n_blocks_count);
1800 : 0 : return -EINVAL;
1801 : : }
1802 : :
1803 [ # # ]: 0 : if (n_blocks_count < o_blocks_count) {
1804 : 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1805 : 0 : return -EINVAL;
1806 : : }
1807 : :
1808 : : /* Handle the remaining blocks in the last group only. */
1809 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1810 : :
1811 [ # # ]: 0 : if (last == 0) {
1812 : 0 : ext4_warning(sb, "need to use ext2online to resize further");
1813 : 0 : return -EPERM;
1814 : : }
1815 : :
1816 : 0 : add = EXT4_BLOCKS_PER_GROUP(sb) - last;
1817 : :
1818 [ # # ]: 0 : if (o_blocks_count + add < o_blocks_count) {
1819 : 0 : ext4_warning(sb, "blocks_count overflow");
1820 : 0 : return -EINVAL;
1821 : : }
1822 : :
1823 [ # # ]: 0 : if (o_blocks_count + add > n_blocks_count)
1824 : 0 : add = n_blocks_count - o_blocks_count;
1825 : :
1826 [ # # ]: 0 : if (o_blocks_count + add < n_blocks_count)
1827 : 0 : ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
1828 : : o_blocks_count + add, add);
1829 : :
1830 : : /* See if the device is actually as big as what was requested */
1831 : 0 : bh = sb_bread(sb, o_blocks_count + add - 1);
1832 [ # # ]: 0 : if (!bh) {
1833 : 0 : ext4_warning(sb, "can't read last block, resize aborted");
1834 : 0 : return -ENOSPC;
1835 : : }
1836 : : brelse(bh);
1837 : :
1838 : 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1839 : 0 : return err;
1840 : : } /* ext4_group_extend */
1841 : :
1842 : :
1843 : : static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
1844 : : {
1845 : 0 : return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
1846 : : }
1847 : :
1848 : : /*
1849 : : * Release the resize inode and drop the resize_inode feature if there
1850 : : * are no more reserved gdt blocks, and then convert the file system
1851 : : * to enable meta_bg
1852 : : */
1853 : 0 : static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
1854 : : {
1855 : : handle_t *handle;
1856 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1857 : 0 : struct ext4_super_block *es = sbi->s_es;
1858 : : struct ext4_inode_info *ei = EXT4_I(inode);
1859 : : ext4_fsblk_t nr;
1860 : : int i, ret, err = 0;
1861 : : int credits = 1;
1862 : :
1863 : 0 : ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
1864 [ # # ]: 0 : if (inode) {
1865 [ # # ]: 0 : if (es->s_reserved_gdt_blocks) {
1866 : 0 : ext4_error(sb, "Unexpected non-zero "
1867 : : "s_reserved_gdt_blocks");
1868 : 0 : return -EPERM;
1869 : : }
1870 : :
1871 : : /* Do a quick sanity check of the resize inode */
1872 [ # # ]: 0 : if (inode->i_blocks != 1 << (inode->i_blkbits -
1873 : 0 : (9 - sbi->s_cluster_bits)))
1874 : : goto invalid_resize_inode;
1875 [ # # ]: 0 : for (i = 0; i < EXT4_N_BLOCKS; i++) {
1876 [ # # ]: 0 : if (i == EXT4_DIND_BLOCK) {
1877 [ # # ]: 0 : if (ei->i_data[i])
1878 : 0 : continue;
1879 : : else
1880 : : goto invalid_resize_inode;
1881 : : }
1882 [ # # ]: 0 : if (ei->i_data[i])
1883 : : goto invalid_resize_inode;
1884 : : }
1885 : : credits += 3; /* block bitmap, bg descriptor, resize inode */
1886 : : }
1887 : :
1888 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
1889 [ # # ]: 0 : if (IS_ERR(handle))
1890 : 0 : return PTR_ERR(handle);
1891 : :
1892 : : BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1893 : 0 : err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1894 [ # # ]: 0 : if (err)
1895 : : goto errout;
1896 : :
1897 : : ext4_clear_feature_resize_inode(sb);
1898 : : ext4_set_feature_meta_bg(sb);
1899 : 0 : sbi->s_es->s_first_meta_bg =
1900 : 0 : cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
1901 : :
1902 : 0 : err = ext4_handle_dirty_super(handle, sb);
1903 [ # # ]: 0 : if (err) {
1904 [ # # ]: 0 : ext4_std_error(sb, err);
1905 : : goto errout;
1906 : : }
1907 : :
1908 [ # # ]: 0 : if (inode) {
1909 : 0 : nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
1910 : 0 : ext4_free_blocks(handle, inode, NULL, nr, 1,
1911 : : EXT4_FREE_BLOCKS_METADATA |
1912 : : EXT4_FREE_BLOCKS_FORGET);
1913 : 0 : ei->i_data[EXT4_DIND_BLOCK] = 0;
1914 : 0 : inode->i_blocks = 0;
1915 : :
1916 : 0 : err = ext4_mark_inode_dirty(handle, inode);
1917 [ # # ]: 0 : if (err)
1918 [ # # ]: 0 : ext4_std_error(sb, err);
1919 : : }
1920 : :
1921 : : errout:
1922 : 0 : ret = ext4_journal_stop(handle);
1923 : : if (!err)
1924 : : err = ret;
1925 : 0 : return ret;
1926 : :
1927 : : invalid_resize_inode:
1928 : 0 : ext4_error(sb, "corrupted/inconsistent resize inode");
1929 : 0 : return -EINVAL;
1930 : : }
1931 : :
1932 : : /*
1933 : : * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
1934 : : *
1935 : : * @sb: super block of the fs to be resized
1936 : : * @n_blocks_count: the number of blocks resides in the resized fs
1937 : : */
1938 : 0 : int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
1939 : : {
1940 : : struct ext4_new_flex_group_data *flex_gd = NULL;
1941 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1942 : 0 : struct ext4_super_block *es = sbi->s_es;
1943 : : struct buffer_head *bh;
1944 : : struct inode *resize_inode = NULL;
1945 : : ext4_grpblk_t add, offset;
1946 : : unsigned long n_desc_blocks;
1947 : : unsigned long o_desc_blocks;
1948 : : ext4_group_t o_group;
1949 : : ext4_group_t n_group;
1950 : : ext4_fsblk_t o_blocks_count;
1951 : : ext4_fsblk_t n_blocks_count_retry = 0;
1952 : : unsigned long last_update_time = 0;
1953 : 0 : int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
1954 : : int meta_bg;
1955 : :
1956 : : /* See if the device is actually as big as what was requested */
1957 : 0 : bh = sb_bread(sb, n_blocks_count - 1);
1958 [ # # ]: 0 : if (!bh) {
1959 : 0 : ext4_warning(sb, "can't read last block, resize aborted");
1960 : 0 : return -ENOSPC;
1961 : : }
1962 : : brelse(bh);
1963 : :
1964 : : retry:
1965 : : o_blocks_count = ext4_blocks_count(es);
1966 : :
1967 : 0 : ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
1968 : : "to %llu blocks", o_blocks_count, n_blocks_count);
1969 : :
1970 [ # # ]: 0 : if (n_blocks_count < o_blocks_count) {
1971 : : /* On-line shrinking not supported */
1972 : 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1973 : 0 : return -EINVAL;
1974 : : }
1975 : :
1976 [ # # ]: 0 : if (n_blocks_count == o_blocks_count)
1977 : : /* Nothing need to do */
1978 : : return 0;
1979 : :
1980 : 0 : n_group = ext4_get_group_number(sb, n_blocks_count - 1);
1981 [ # # ]: 0 : if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
1982 : 0 : ext4_warning(sb, "resize would cause inodes_count overflow");
1983 : 0 : return -EINVAL;
1984 : : }
1985 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
1986 : :
1987 : 0 : n_desc_blocks = num_desc_blocks(sb, n_group + 1);
1988 : 0 : o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
1989 : :
1990 : 0 : meta_bg = ext4_has_feature_meta_bg(sb);
1991 : :
1992 [ # # ]: 0 : if (ext4_has_feature_resize_inode(sb)) {
1993 [ # # ]: 0 : if (meta_bg) {
1994 : 0 : ext4_error(sb, "resize_inode and meta_bg enabled "
1995 : : "simultaneously");
1996 : 0 : return -EINVAL;
1997 : : }
1998 [ # # ]: 0 : if (n_desc_blocks > o_desc_blocks +
1999 : 0 : le16_to_cpu(es->s_reserved_gdt_blocks)) {
2000 : : n_blocks_count_retry = n_blocks_count;
2001 : : n_desc_blocks = o_desc_blocks +
2002 : : le16_to_cpu(es->s_reserved_gdt_blocks);
2003 : 0 : n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
2004 : 0 : n_blocks_count = (ext4_fsblk_t)n_group *
2005 : 0 : EXT4_BLOCKS_PER_GROUP(sb) +
2006 : 0 : le32_to_cpu(es->s_first_data_block);
2007 : 0 : n_group--; /* set to last group number */
2008 : : }
2009 : :
2010 [ # # ]: 0 : if (!resize_inode)
2011 : 0 : resize_inode = ext4_iget(sb, EXT4_RESIZE_INO,
2012 : : EXT4_IGET_SPECIAL);
2013 [ # # ]: 0 : if (IS_ERR(resize_inode)) {
2014 : 0 : ext4_warning(sb, "Error opening resize inode");
2015 : 0 : return PTR_ERR(resize_inode);
2016 : : }
2017 : : }
2018 : :
2019 [ # # # # ]: 0 : if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
2020 : 0 : err = ext4_convert_meta_bg(sb, resize_inode);
2021 [ # # ]: 0 : if (err)
2022 : : goto out;
2023 [ # # ]: 0 : if (resize_inode) {
2024 : 0 : iput(resize_inode);
2025 : : resize_inode = NULL;
2026 : : }
2027 [ # # ]: 0 : if (n_blocks_count_retry) {
2028 : : n_blocks_count = n_blocks_count_retry;
2029 : : n_blocks_count_retry = 0;
2030 : : goto retry;
2031 : : }
2032 : : }
2033 : :
2034 : : /*
2035 : : * Make sure the last group has enough space so that it's
2036 : : * guaranteed to have enough space for all metadata blocks
2037 : : * that it might need to hold. (We might not need to store
2038 : : * the inode table blocks in the last block group, but there
2039 : : * will be cases where this might be needed.)
2040 : : */
2041 [ # # ]: 0 : if ((ext4_group_first_block_no(sb, n_group) +
2042 : 0 : ext4_group_overhead_blocks(sb, n_group) + 2 +
2043 : 0 : sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) {
2044 : : n_blocks_count = ext4_group_first_block_no(sb, n_group);
2045 : : n_group--;
2046 : : n_blocks_count_retry = 0;
2047 [ # # ]: 0 : if (resize_inode) {
2048 : 0 : iput(resize_inode);
2049 : : resize_inode = NULL;
2050 : : }
2051 : : goto retry;
2052 : : }
2053 : :
2054 : : /* extend the last group */
2055 [ # # ]: 0 : if (n_group == o_group)
2056 : 0 : add = n_blocks_count - o_blocks_count;
2057 : : else
2058 : 0 : add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1));
2059 [ # # ]: 0 : if (add > 0) {
2060 : 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
2061 [ # # ]: 0 : if (err)
2062 : : goto out;
2063 : : }
2064 : :
2065 [ # # ]: 0 : if (ext4_blocks_count(es) == n_blocks_count)
2066 : : goto out;
2067 : :
2068 : 0 : err = ext4_alloc_flex_bg_array(sb, n_group + 1);
2069 [ # # ]: 0 : if (err)
2070 : : goto out;
2071 : :
2072 : 0 : err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
2073 [ # # ]: 0 : if (err)
2074 : : goto out;
2075 : :
2076 : 0 : flex_gd = alloc_flex_gd(flexbg_size);
2077 [ # # ]: 0 : if (flex_gd == NULL) {
2078 : : err = -ENOMEM;
2079 : : goto out;
2080 : : }
2081 : :
2082 : : /* Add flex groups. Note that a regular group is a
2083 : : * flex group with 1 group.
2084 : : */
2085 [ # # ]: 0 : while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
2086 : : flexbg_size)) {
2087 [ # # ]: 0 : if (jiffies - last_update_time > HZ * 10) {
2088 [ # # ]: 0 : if (last_update_time)
2089 : 0 : ext4_msg(sb, KERN_INFO,
2090 : : "resized to %llu blocks",
2091 : : ext4_blocks_count(es));
2092 : 0 : last_update_time = jiffies;
2093 : : }
2094 [ # # ]: 0 : if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
2095 : : break;
2096 : 0 : err = ext4_flex_group_add(sb, resize_inode, flex_gd);
2097 [ # # ]: 0 : if (unlikely(err))
2098 : : break;
2099 : : }
2100 : :
2101 [ # # ]: 0 : if (!err && n_blocks_count_retry) {
2102 : : n_blocks_count = n_blocks_count_retry;
2103 : : n_blocks_count_retry = 0;
2104 : 0 : free_flex_gd(flex_gd);
2105 : : flex_gd = NULL;
2106 [ # # ]: 0 : if (resize_inode) {
2107 : 0 : iput(resize_inode);
2108 : : resize_inode = NULL;
2109 : : }
2110 : : goto retry;
2111 : : }
2112 : :
2113 : : out:
2114 [ # # ]: 0 : if (flex_gd)
2115 : 0 : free_flex_gd(flex_gd);
2116 [ # # ]: 0 : if (resize_inode != NULL)
2117 : 0 : iput(resize_inode);
2118 [ # # ]: 0 : if (err)
2119 : 0 : ext4_warning(sb, "error (%d) occurred during "
2120 : : "file system resize", err);
2121 : 0 : ext4_msg(sb, KERN_INFO, "resized filesystem to %llu",
2122 : : ext4_blocks_count(es));
2123 : 0 : return err;
2124 : : }
|
