Line data Source code
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 invalid kqids being returned.
95 : * Invalid kqids may be tested for using qid_valid().
96 : */
97 89103 : static inline struct kqid make_kqid(struct user_namespace *from,
98 : enum quota_type type, qid_t qid)
99 : {
100 89103 : struct kqid kqid;
101 :
102 89103 : kqid.type = type;
103 89103 : switch (type) {
104 48944 : case USRQUOTA:
105 48944 : kqid.uid = make_kuid(from, qid);
106 48944 : break;
107 33723 : case GRPQUOTA:
108 33723 : kqid.gid = make_kgid(from, qid);
109 33723 : break;
110 6436 : case PRJQUOTA:
111 6436 : kqid.projid = make_kprojid(from, qid);
112 6436 : break;
113 0 : default:
114 0 : BUG();
115 : }
116 89103 : 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 : 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 : 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 : 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 : 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 0 : struct kqid kqid;
177 0 : kqid.type = PRJQUOTA;
178 0 : 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 : 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 come in three flavors - for users, groups and projects.
452 : *
453 : * Actual typed flags layout:
454 : * USRQUOTA GRPQUOTA PRJQUOTA
455 : * DQUOT_USAGE_ENABLED 0x0001 0x0002 0x0004
456 : * DQUOT_LIMITS_ENABLED 0x0008 0x0010 0x0020
457 : * DQUOT_SUSPENDED 0x0040 0x0080 0x0100
458 : *
459 : * Following bits are used for non-typed flags:
460 : * DQUOT_QUOTA_SYS_FILE 0x0200
461 : * DQUOT_NEGATIVE_USAGE 0x0400
462 : * DQUOT_NOLIST_DIRTY 0x0800
463 : */
464 : enum {
465 : _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
466 : _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
467 : _DQUOT_SUSPENDED, /* User diskquotas are off, but
468 : * we have necessary info in
469 : * memory to turn them on */
470 : _DQUOT_STATE_FLAGS
471 : };
472 : #define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
473 : #define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
474 : #define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
475 : #define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
476 : DQUOT_SUSPENDED)
477 : /* Other quota flags */
478 : #define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS)
479 : #define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST)
480 : /* Quota file is a special
481 : * system file and user cannot
482 : * touch it. Filesystem is
483 : * responsible for setting
484 : * S_NOQUOTA, S_NOATIME flags
485 : */
486 : #define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1))
487 : /* Allow negative quota usage */
488 : /* Do not track dirty dquots in a list */
489 : #define DQUOT_NOLIST_DIRTY (1 << (DQUOT_STATE_LAST + 2))
490 :
491 : static inline unsigned int dquot_state_flag(unsigned int flags, int type)
492 : {
493 : return flags << type;
494 : }
495 :
496 : static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
497 : {
498 : return (flags >> type) & DQUOT_STATE_FLAGS;
499 : }
500 :
501 : /* Bitmap of quota types where flag is set in flags */
502 : static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
503 : {
504 0 : BUILD_BUG_ON_NOT_POWER_OF_2(flag);
505 0 : return (flags / flag) & ((1 << MAXQUOTAS) - 1);
506 : }
507 :
508 : #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
509 : extern void quota_send_warning(struct kqid qid, dev_t dev,
510 : const char warntype);
511 : #else
512 : static inline void quota_send_warning(struct kqid qid, dev_t dev,
513 : const char warntype)
514 : {
515 : return;
516 : }
517 : #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
518 :
519 : struct quota_info {
520 : unsigned int flags; /* Flags for diskquotas on this device */
521 : struct rw_semaphore dqio_sem; /* Lock quota file while I/O in progress */
522 : struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
523 : struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
524 : const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
525 : };
526 :
527 : int register_quota_format(struct quota_format_type *fmt);
528 : void unregister_quota_format(struct quota_format_type *fmt);
529 :
530 : struct quota_module_name {
531 : int qm_fmt_id;
532 : char *qm_mod_name;
533 : };
534 :
535 : #define INIT_QUOTA_MODULE_NAMES {\
536 : {QFMT_VFS_OLD, "quota_v1"},\
537 : {QFMT_VFS_V0, "quota_v2"},\
538 : {QFMT_VFS_V1, "quota_v2"},\
539 : {0, NULL}}
540 :
541 : #endif /* _QUOTA_ */
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