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1 : : /*
2 : : * Copyright (c) 1982, 1986 Regents of the University of California.
3 : : * All rights reserved.
4 : : *
5 : : * This code is derived from software contributed to Berkeley by
6 : : * Robert Elz at The University of Melbourne.
7 : : *
8 : : * Redistribution and use in source and binary forms, with or without
9 : : * modification, are permitted provided that the following conditions
10 : : * are met:
11 : : * 1. Redistributions of source code must retain the above copyright
12 : : * notice, this list of conditions and the following disclaimer.
13 : : * 2. Redistributions in binary form must reproduce the above copyright
14 : : * notice, this list of conditions and the following disclaimer in the
15 : : * documentation and/or other materials provided with the distribution.
16 : : * 3. Neither the name of the University nor the names of its contributors
17 : : * may be used to endorse or promote products derived from this software
18 : : * without specific prior written permission.
19 : : *
20 : : * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 : : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 : : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 : : * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 : : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 : : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 : : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 : : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 : : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 : : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 : : * SUCH DAMAGE.
31 : : */
32 : : #ifndef _LINUX_QUOTA_
33 : : #define _LINUX_QUOTA_
34 : :
35 : : #include <linux/list.h>
36 : : #include <linux/mutex.h>
37 : : #include <linux/rwsem.h>
38 : : #include <linux/spinlock.h>
39 : : #include <linux/wait.h>
40 : : #include <linux/percpu_counter.h>
41 : :
42 : : #include <linux/dqblk_xfs.h>
43 : : #include <linux/dqblk_v1.h>
44 : : #include <linux/dqblk_v2.h>
45 : :
46 : : #include <linux/atomic.h>
47 : : #include <linux/uidgid.h>
48 : : #include <linux/projid.h>
49 : : #include <uapi/linux/quota.h>
50 : :
51 : : #undef USRQUOTA
52 : : #undef GRPQUOTA
53 : : #undef PRJQUOTA
54 : : enum quota_type {
55 : : USRQUOTA = 0, /* element used for user quotas */
56 : : GRPQUOTA = 1, /* element used for group quotas */
57 : : PRJQUOTA = 2, /* element used for project quotas */
58 : : };
59 : :
60 : : /* Masks for quota types when used as a bitmask */
61 : : #define QTYPE_MASK_USR (1 << USRQUOTA)
62 : : #define QTYPE_MASK_GRP (1 << GRPQUOTA)
63 : : #define QTYPE_MASK_PRJ (1 << PRJQUOTA)
64 : :
65 : : typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
66 : : typedef long long qsize_t; /* Type in which we store sizes */
67 : :
68 : : struct kqid { /* Type in which we store the quota identifier */
69 : : union {
70 : : kuid_t uid;
71 : : kgid_t gid;
72 : : kprojid_t projid;
73 : : };
74 : : enum quota_type type; /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
75 : : };
76 : :
77 : : extern bool qid_eq(struct kqid left, struct kqid right);
78 : : extern bool qid_lt(struct kqid left, struct kqid right);
79 : : extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
80 : : extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
81 : : extern bool qid_valid(struct kqid qid);
82 : :
83 : : /**
84 : : * make_kqid - Map a user-namespace, type, qid tuple into a kqid.
85 : : * @from: User namespace that the qid is in
86 : : * @type: The type of quota
87 : : * @qid: Quota identifier
88 : : *
89 : : * Maps a user-namespace, type qid tuple into a kernel internal
90 : : * kqid, and returns that kqid.
91 : : *
92 : : * When there is no mapping defined for the user-namespace, type,
93 : : * qid tuple an invalid kqid is returned. Callers are expected to
94 : : * test for and handle handle invalid kqids being returned.
95 : : * Invalid kqids may be tested for using qid_valid().
96 : : */
97 : 0 : static inline struct kqid make_kqid(struct user_namespace *from,
98 : : enum quota_type type, qid_t qid)
99 : : {
100 : : struct kqid kqid;
101 : :
102 : : kqid.type = type;
103 [ # # # # ]: 0 : switch (type) {
104 : : case USRQUOTA:
105 : 0 : kqid.uid = make_kuid(from, qid);
106 : 0 : break;
107 : : case GRPQUOTA:
108 : 0 : kqid.gid = make_kgid(from, qid);
109 : 0 : break;
110 : : case PRJQUOTA:
111 : 0 : kqid.projid = make_kprojid(from, qid);
112 : 0 : break;
113 : : default:
114 : 0 : BUG();
115 : : }
116 : 0 : return kqid;
117 : : }
118 : :
119 : : /**
120 : : * make_kqid_invalid - Explicitly make an invalid kqid
121 : : * @type: The type of quota identifier
122 : : *
123 : : * Returns an invalid kqid with the specified type.
124 : : */
125 : : static inline struct kqid make_kqid_invalid(enum quota_type type)
126 : : {
127 : : struct kqid kqid;
128 : :
129 : : kqid.type = type;
130 [ # # ]: 0 : switch (type) {
131 : : case USRQUOTA:
132 : : kqid.uid = INVALID_UID;
133 : : break;
134 : : case GRPQUOTA:
135 : : kqid.gid = INVALID_GID;
136 : : break;
137 : : case PRJQUOTA:
138 : : kqid.projid = INVALID_PROJID;
139 : : break;
140 : : default:
141 : 0 : BUG();
142 : : }
143 : : return kqid;
144 : : }
145 : :
146 : : /**
147 : : * make_kqid_uid - Make a kqid from a kuid
148 : : * @uid: The kuid to make the quota identifier from
149 : : */
150 : : static inline struct kqid make_kqid_uid(kuid_t uid)
151 : : {
152 : : struct kqid kqid;
153 : : kqid.type = USRQUOTA;
154 : : kqid.uid = uid;
155 : 0 : return kqid;
156 : : }
157 : :
158 : : /**
159 : : * make_kqid_gid - Make a kqid from a kgid
160 : : * @gid: The kgid to make the quota identifier from
161 : : */
162 : : static inline struct kqid make_kqid_gid(kgid_t gid)
163 : : {
164 : : struct kqid kqid;
165 : : kqid.type = GRPQUOTA;
166 : : kqid.gid = gid;
167 : 0 : return kqid;
168 : : }
169 : :
170 : : /**
171 : : * make_kqid_projid - Make a kqid from a projid
172 : : * @projid: The kprojid to make the quota identifier from
173 : : */
174 : : static inline struct kqid make_kqid_projid(kprojid_t projid)
175 : : {
176 : : struct kqid kqid;
177 : : kqid.type = PRJQUOTA;
178 : : kqid.projid = projid;
179 : 0 : return kqid;
180 : : }
181 : :
182 : : /**
183 : : * qid_has_mapping - Report if a qid maps into a user namespace.
184 : : * @ns: The user namespace to see if a value maps into.
185 : : * @qid: The kernel internal quota identifier to test.
186 : : */
187 : : static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
188 : : {
189 : 0 : return from_kqid(ns, qid) != (qid_t) -1;
190 : : }
191 : :
192 : :
193 : : extern spinlock_t dq_data_lock;
194 : :
195 : : /* Maximal numbers of writes for quota operation (insert/delete/update)
196 : : * (over VFS all formats) */
197 : : #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
198 : : #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
199 : : #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
200 : : #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
201 : :
202 : : /*
203 : : * Data for one user/group kept in memory
204 : : */
205 : : struct mem_dqblk {
206 : : qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
207 : : qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
208 : : qsize_t dqb_curspace; /* current used space */
209 : : qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
210 : : qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
211 : : qsize_t dqb_isoftlimit; /* preferred inode limit */
212 : : qsize_t dqb_curinodes; /* current # allocated inodes */
213 : : time64_t dqb_btime; /* time limit for excessive disk use */
214 : : time64_t dqb_itime; /* time limit for excessive inode use */
215 : : };
216 : :
217 : : /*
218 : : * Data for one quotafile kept in memory
219 : : */
220 : : struct quota_format_type;
221 : :
222 : : struct mem_dqinfo {
223 : : struct quota_format_type *dqi_format;
224 : : int dqi_fmt_id; /* Id of the dqi_format - used when turning
225 : : * quotas on after remount RW */
226 : : struct list_head dqi_dirty_list; /* List of dirty dquots [dq_list_lock] */
227 : : unsigned long dqi_flags; /* DFQ_ flags [dq_data_lock] */
228 : : unsigned int dqi_bgrace; /* Space grace time [dq_data_lock] */
229 : : unsigned int dqi_igrace; /* Inode grace time [dq_data_lock] */
230 : : qsize_t dqi_max_spc_limit; /* Maximum space limit [static] */
231 : : qsize_t dqi_max_ino_limit; /* Maximum inode limit [static] */
232 : : void *dqi_priv;
233 : : };
234 : :
235 : : struct super_block;
236 : :
237 : : /* Mask for flags passed to userspace */
238 : : #define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
239 : : /* Mask for flags modifiable from userspace */
240 : : #define DQF_SETINFO_MASK DQF_ROOT_SQUASH
241 : :
242 : : enum {
243 : : DQF_INFO_DIRTY_B = DQF_PRIVATE,
244 : : };
245 : : #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
246 : :
247 : : extern void mark_info_dirty(struct super_block *sb, int type);
248 : : static inline int info_dirty(struct mem_dqinfo *info)
249 : : {
250 : : return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
251 : : }
252 : :
253 : : enum {
254 : : DQST_LOOKUPS,
255 : : DQST_DROPS,
256 : : DQST_READS,
257 : : DQST_WRITES,
258 : : DQST_CACHE_HITS,
259 : : DQST_ALLOC_DQUOTS,
260 : : DQST_FREE_DQUOTS,
261 : : DQST_SYNCS,
262 : : _DQST_DQSTAT_LAST
263 : : };
264 : :
265 : : struct dqstats {
266 : : unsigned long stat[_DQST_DQSTAT_LAST];
267 : : struct percpu_counter counter[_DQST_DQSTAT_LAST];
268 : : };
269 : :
270 : : extern struct dqstats dqstats;
271 : :
272 : : static inline void dqstats_inc(unsigned int type)
273 : : {
274 : : percpu_counter_inc(&dqstats.counter[type]);
275 : : }
276 : :
277 : : static inline void dqstats_dec(unsigned int type)
278 : : {
279 : : percpu_counter_dec(&dqstats.counter[type]);
280 : : }
281 : :
282 : : #define DQ_MOD_B 0 /* dquot modified since read */
283 : : #define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
284 : : #define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
285 : : #define DQ_FAKE_B 3 /* no limits only usage */
286 : : #define DQ_READ_B 4 /* dquot was read into memory */
287 : : #define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
288 : : #define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\
289 : : * for the mask of entries set via SETQUOTA\
290 : : * quotactl. They are set under dq_data_lock\
291 : : * and the quota format handling dquot can\
292 : : * clear them when it sees fit. */
293 : :
294 : : struct dquot {
295 : : struct hlist_node dq_hash; /* Hash list in memory [dq_list_lock] */
296 : : struct list_head dq_inuse; /* List of all quotas [dq_list_lock] */
297 : : struct list_head dq_free; /* Free list element [dq_list_lock] */
298 : : struct list_head dq_dirty; /* List of dirty dquots [dq_list_lock] */
299 : : struct mutex dq_lock; /* dquot IO lock */
300 : : spinlock_t dq_dqb_lock; /* Lock protecting dq_dqb changes */
301 : : atomic_t dq_count; /* Use count */
302 : : struct super_block *dq_sb; /* superblock this applies to */
303 : : struct kqid dq_id; /* ID this applies to (uid, gid, projid) */
304 : : loff_t dq_off; /* Offset of dquot on disk [dq_lock, stable once set] */
305 : : unsigned long dq_flags; /* See DQ_* */
306 : : struct mem_dqblk dq_dqb; /* Diskquota usage [dq_dqb_lock] */
307 : : };
308 : :
309 : : /* Operations which must be implemented by each quota format */
310 : : struct quota_format_ops {
311 : : int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */
312 : : int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */
313 : : int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */
314 : : int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */
315 : : int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */
316 : : int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */
317 : : int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */
318 : : int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */
319 : : };
320 : :
321 : : /* Operations working with dquots */
322 : : struct dquot_operations {
323 : : int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
324 : : struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */
325 : : void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */
326 : : int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */
327 : : int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
328 : : int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
329 : : int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
330 : : /* get reserved quota for delayed alloc, value returned is managed by
331 : : * quota code only */
332 : : qsize_t *(*get_reserved_space) (struct inode *);
333 : : int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
334 : : /* Get number of inodes that were charged for a given inode */
335 : : int (*get_inode_usage) (struct inode *, qsize_t *);
336 : : /* Get next ID with active quota structure */
337 : : int (*get_next_id) (struct super_block *sb, struct kqid *qid);
338 : : };
339 : :
340 : : struct path;
341 : :
342 : : /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
343 : : struct qc_dqblk {
344 : : int d_fieldmask; /* mask of fields to change in ->set_dqblk() */
345 : : u64 d_spc_hardlimit; /* absolute limit on used space */
346 : : u64 d_spc_softlimit; /* preferred limit on used space */
347 : : u64 d_ino_hardlimit; /* maximum # allocated inodes */
348 : : u64 d_ino_softlimit; /* preferred inode limit */
349 : : u64 d_space; /* Space owned by the user */
350 : : u64 d_ino_count; /* # inodes owned by the user */
351 : : s64 d_ino_timer; /* zero if within inode limits */
352 : : /* if not, we refuse service */
353 : : s64 d_spc_timer; /* similar to above; for space */
354 : : int d_ino_warns; /* # warnings issued wrt num inodes */
355 : : int d_spc_warns; /* # warnings issued wrt used space */
356 : : u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
357 : : u64 d_rt_spc_softlimit; /* preferred limit on RT space */
358 : : u64 d_rt_space; /* realtime space owned */
359 : : s64 d_rt_spc_timer; /* similar to above; for RT space */
360 : : int d_rt_spc_warns; /* # warnings issued wrt RT space */
361 : : };
362 : :
363 : : /*
364 : : * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
365 : : * ->set_info() in struct qc_info
366 : : */
367 : : #define QC_INO_SOFT (1<<0)
368 : : #define QC_INO_HARD (1<<1)
369 : : #define QC_SPC_SOFT (1<<2)
370 : : #define QC_SPC_HARD (1<<3)
371 : : #define QC_RT_SPC_SOFT (1<<4)
372 : : #define QC_RT_SPC_HARD (1<<5)
373 : : #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
374 : : QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
375 : : #define QC_SPC_TIMER (1<<6)
376 : : #define QC_INO_TIMER (1<<7)
377 : : #define QC_RT_SPC_TIMER (1<<8)
378 : : #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
379 : : #define QC_SPC_WARNS (1<<9)
380 : : #define QC_INO_WARNS (1<<10)
381 : : #define QC_RT_SPC_WARNS (1<<11)
382 : : #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
383 : : #define QC_SPACE (1<<12)
384 : : #define QC_INO_COUNT (1<<13)
385 : : #define QC_RT_SPACE (1<<14)
386 : : #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
387 : : #define QC_FLAGS (1<<15)
388 : :
389 : : #define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */
390 : : #define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */
391 : : #define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */
392 : : #define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */
393 : :
394 : : /* Structures for communicating via ->get_state */
395 : : struct qc_type_state {
396 : : unsigned int flags; /* Flags QCI_* */
397 : : unsigned int spc_timelimit; /* Time after which space softlimit is
398 : : * enforced */
399 : : unsigned int ino_timelimit; /* Ditto for inode softlimit */
400 : : unsigned int rt_spc_timelimit; /* Ditto for real-time space */
401 : : unsigned int spc_warnlimit; /* Limit for number of space warnings */
402 : : unsigned int ino_warnlimit; /* Ditto for inodes */
403 : : unsigned int rt_spc_warnlimit; /* Ditto for real-time space */
404 : : unsigned long long ino; /* Inode number of quota file */
405 : : blkcnt_t blocks; /* Number of 512-byte blocks in the file */
406 : : blkcnt_t nextents; /* Number of extents in the file */
407 : : };
408 : :
409 : : struct qc_state {
410 : : unsigned int s_incoredqs; /* Number of dquots in core */
411 : : struct qc_type_state s_state[MAXQUOTAS]; /* Per quota type information */
412 : : };
413 : :
414 : : /* Structure for communicating via ->set_info */
415 : : struct qc_info {
416 : : int i_fieldmask; /* mask of fields to change in ->set_info() */
417 : : unsigned int i_flags; /* Flags QCI_* */
418 : : unsigned int i_spc_timelimit; /* Time after which space softlimit is
419 : : * enforced */
420 : : unsigned int i_ino_timelimit; /* Ditto for inode softlimit */
421 : : unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
422 : : unsigned int i_spc_warnlimit; /* Limit for number of space warnings */
423 : : unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */
424 : : unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */
425 : : };
426 : :
427 : : /* Operations handling requests from userspace */
428 : : struct quotactl_ops {
429 : : int (*quota_on)(struct super_block *, int, int, const struct path *);
430 : : int (*quota_off)(struct super_block *, int);
431 : : int (*quota_enable)(struct super_block *, unsigned int);
432 : : int (*quota_disable)(struct super_block *, unsigned int);
433 : : int (*quota_sync)(struct super_block *, int);
434 : : int (*set_info)(struct super_block *, int, struct qc_info *);
435 : : int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
436 : : int (*get_nextdqblk)(struct super_block *, struct kqid *,
437 : : struct qc_dqblk *);
438 : : int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
439 : : int (*get_state)(struct super_block *, struct qc_state *);
440 : : int (*rm_xquota)(struct super_block *, unsigned int);
441 : : };
442 : :
443 : : struct quota_format_type {
444 : : int qf_fmt_id; /* Quota format id */
445 : : const struct quota_format_ops *qf_ops; /* Operations of format */
446 : : struct module *qf_owner; /* Module implementing quota format */
447 : : struct quota_format_type *qf_next;
448 : : };
449 : :
450 : : /**
451 : : * Quota state flags - they actually come in two flavors - for users and groups.
452 : : *
453 : : * Actual typed flags layout:
454 : : * USRQUOTA GRPQUOTA
455 : : * DQUOT_USAGE_ENABLED 0x0001 0x0002
456 : : * DQUOT_LIMITS_ENABLED 0x0004 0x0008
457 : : * DQUOT_SUSPENDED 0x0010 0x0020
458 : : *
459 : : * Following bits are used for non-typed flags:
460 : : * DQUOT_QUOTA_SYS_FILE 0x0040
461 : : * DQUOT_NEGATIVE_USAGE 0x0080
462 : : */
463 : : enum {
464 : : _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
465 : : _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
466 : : _DQUOT_SUSPENDED, /* User diskquotas are off, but
467 : : * we have necessary info in
468 : : * memory to turn them on */
469 : : _DQUOT_STATE_FLAGS
470 : : };
471 : : #define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
472 : : #define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
473 : : #define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
474 : : #define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
475 : : DQUOT_SUSPENDED)
476 : : /* Other quota flags */
477 : : #define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS)
478 : : #define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST)
479 : : /* Quota file is a special
480 : : * system file and user cannot
481 : : * touch it. Filesystem is
482 : : * responsible for setting
483 : : * S_NOQUOTA, S_NOATIME flags
484 : : */
485 : : #define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1))
486 : : /* Allow negative quota usage */
487 : : /* Do not track dirty dquots in a list */
488 : : #define DQUOT_NOLIST_DIRTY (1 << (DQUOT_STATE_LAST + 2))
489 : :
490 : : static inline unsigned int dquot_state_flag(unsigned int flags, int type)
491 : : {
492 : 4848 : return flags << type;
493 : : }
494 : :
495 : : static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
496 : : {
497 : 0 : return (flags >> type) & DQUOT_STATE_FLAGS;
498 : : }
499 : :
500 : : /* Bitmap of quota types where flag is set in flags */
501 : : static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
502 : : {
503 : : BUILD_BUG_ON_NOT_POWER_OF_2(flag);
504 : 1413374 : return (flags / flag) & ((1 << MAXQUOTAS) - 1);
505 : : }
506 : :
507 : : #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
508 : : extern void quota_send_warning(struct kqid qid, dev_t dev,
509 : : const char warntype);
510 : : #else
511 : : static inline void quota_send_warning(struct kqid qid, dev_t dev,
512 : : const char warntype)
513 : : {
514 : : return;
515 : : }
516 : : #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
517 : :
518 : : struct quota_info {
519 : : unsigned int flags; /* Flags for diskquotas on this device */
520 : : struct rw_semaphore dqio_sem; /* Lock quota file while I/O in progress */
521 : : struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
522 : : struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
523 : : const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
524 : : };
525 : :
526 : : int register_quota_format(struct quota_format_type *fmt);
527 : : void unregister_quota_format(struct quota_format_type *fmt);
528 : :
529 : : struct quota_module_name {
530 : : int qm_fmt_id;
531 : : char *qm_mod_name;
532 : : };
533 : :
534 : : #define INIT_QUOTA_MODULE_NAMES {\
535 : : {QFMT_VFS_OLD, "quota_v1"},\
536 : : {QFMT_VFS_V0, "quota_v2"},\
537 : : {QFMT_VFS_V1, "quota_v2"},\
538 : : {0, NULL}}
539 : :
540 : : #endif /* _QUOTA_ */
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