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 | 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 | switch (type) { |
104 | case USRQUOTA: |
105 | kqid.uid = make_kuid(from, uid: qid); |
106 | break; |
107 | case GRPQUOTA: |
108 | kqid.gid = make_kgid(from, gid: qid); |
109 | break; |
110 | case PRJQUOTA: |
111 | kqid.projid = make_kprojid(from, projid: qid); |
112 | break; |
113 | default: |
114 | BUG(); |
115 | } |
116 | 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 | struct kqid kqid; |
177 | kqid.type = PRJQUOTA; |
178 | kqid.projid = projid; |
179 | 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(to: 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(fbc: &dqstats.counter[type]); |
275 | } |
276 | |
277 | static inline void dqstats_dec(unsigned int type) |
278 | { |
279 | percpu_counter_dec(fbc: &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_RELEASING_B 6 /* dquot is in releasing_dquots list waiting |
289 | * to be cleaned up */ |
290 | #define DQ_LASTSET_B 7 /* Following 6 bits (see QIF_) are reserved\ |
291 | * for the mask of entries set via SETQUOTA\ |
292 | * quotactl. They are set under dq_data_lock\ |
293 | * and the quota format handling dquot can\ |
294 | * clear them when it sees fit. */ |
295 | |
296 | struct dquot { |
297 | struct hlist_node dq_hash; /* Hash list in memory [dq_list_lock] */ |
298 | struct list_head dq_inuse; /* List of all quotas [dq_list_lock] */ |
299 | struct list_head dq_free; /* Free list element [dq_list_lock] */ |
300 | struct list_head dq_dirty; /* List of dirty dquots [dq_list_lock] */ |
301 | struct mutex dq_lock; /* dquot IO lock */ |
302 | spinlock_t dq_dqb_lock; /* Lock protecting dq_dqb changes */ |
303 | atomic_t dq_count; /* Use count */ |
304 | struct super_block *dq_sb; /* superblock this applies to */ |
305 | struct kqid dq_id; /* ID this applies to (uid, gid, projid) */ |
306 | loff_t dq_off; /* Offset of dquot on disk [dq_lock, stable once set] */ |
307 | unsigned long dq_flags; /* See DQ_* */ |
308 | struct mem_dqblk dq_dqb; /* Diskquota usage [dq_dqb_lock] */ |
309 | }; |
310 | |
311 | /* Operations which must be implemented by each quota format */ |
312 | struct quota_format_ops { |
313 | int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */ |
314 | int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */ |
315 | int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */ |
316 | int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */ |
317 | int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */ |
318 | int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */ |
319 | int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */ |
320 | int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */ |
321 | }; |
322 | |
323 | /* Operations working with dquots */ |
324 | struct dquot_operations { |
325 | int (*write_dquot) (struct dquot *); /* Ordinary dquot write */ |
326 | struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */ |
327 | void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */ |
328 | int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */ |
329 | int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ |
330 | int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ |
331 | int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ |
332 | /* get reserved quota for delayed alloc, value returned is managed by |
333 | * quota code only */ |
334 | qsize_t *(*get_reserved_space) (struct inode *); |
335 | int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */ |
336 | /* Get number of inodes that were charged for a given inode */ |
337 | int (*get_inode_usage) (struct inode *, qsize_t *); |
338 | /* Get next ID with active quota structure */ |
339 | int (*get_next_id) (struct super_block *sb, struct kqid *qid); |
340 | }; |
341 | |
342 | struct path; |
343 | |
344 | /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */ |
345 | struct qc_dqblk { |
346 | int d_fieldmask; /* mask of fields to change in ->set_dqblk() */ |
347 | u64 d_spc_hardlimit; /* absolute limit on used space */ |
348 | u64 d_spc_softlimit; /* preferred limit on used space */ |
349 | u64 d_ino_hardlimit; /* maximum # allocated inodes */ |
350 | u64 d_ino_softlimit; /* preferred inode limit */ |
351 | u64 d_space; /* Space owned by the user */ |
352 | u64 d_ino_count; /* # inodes owned by the user */ |
353 | s64 d_ino_timer; /* zero if within inode limits */ |
354 | /* if not, we refuse service */ |
355 | s64 d_spc_timer; /* similar to above; for space */ |
356 | int d_ino_warns; /* # warnings issued wrt num inodes */ |
357 | int d_spc_warns; /* # warnings issued wrt used space */ |
358 | u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */ |
359 | u64 d_rt_spc_softlimit; /* preferred limit on RT space */ |
360 | u64 d_rt_space; /* realtime space owned */ |
361 | s64 d_rt_spc_timer; /* similar to above; for RT space */ |
362 | int d_rt_spc_warns; /* # warnings issued wrt RT space */ |
363 | }; |
364 | |
365 | /* |
366 | * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for |
367 | * ->set_info() in struct qc_info |
368 | */ |
369 | #define QC_INO_SOFT (1<<0) |
370 | #define QC_INO_HARD (1<<1) |
371 | #define QC_SPC_SOFT (1<<2) |
372 | #define QC_SPC_HARD (1<<3) |
373 | #define QC_RT_SPC_SOFT (1<<4) |
374 | #define QC_RT_SPC_HARD (1<<5) |
375 | #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \ |
376 | QC_RT_SPC_SOFT | QC_RT_SPC_HARD) |
377 | #define QC_SPC_TIMER (1<<6) |
378 | #define QC_INO_TIMER (1<<7) |
379 | #define QC_RT_SPC_TIMER (1<<8) |
380 | #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER) |
381 | #define QC_SPC_WARNS (1<<9) |
382 | #define QC_INO_WARNS (1<<10) |
383 | #define QC_RT_SPC_WARNS (1<<11) |
384 | #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS) |
385 | #define QC_SPACE (1<<12) |
386 | #define QC_INO_COUNT (1<<13) |
387 | #define QC_RT_SPACE (1<<14) |
388 | #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE) |
389 | #define QC_FLAGS (1<<15) |
390 | |
391 | #define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */ |
392 | #define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */ |
393 | #define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */ |
394 | #define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */ |
395 | |
396 | /* Structures for communicating via ->get_state */ |
397 | struct qc_type_state { |
398 | unsigned int flags; /* Flags QCI_* */ |
399 | unsigned int spc_timelimit; /* Time after which space softlimit is |
400 | * enforced */ |
401 | unsigned int ino_timelimit; /* Ditto for inode softlimit */ |
402 | unsigned int rt_spc_timelimit; /* Ditto for real-time space */ |
403 | unsigned int spc_warnlimit; /* Limit for number of space warnings */ |
404 | unsigned int ino_warnlimit; /* Ditto for inodes */ |
405 | unsigned int rt_spc_warnlimit; /* Ditto for real-time space */ |
406 | unsigned long long ino; /* Inode number of quota file */ |
407 | blkcnt_t blocks; /* Number of 512-byte blocks in the file */ |
408 | blkcnt_t nextents; /* Number of extents in the file */ |
409 | }; |
410 | |
411 | struct qc_state { |
412 | unsigned int s_incoredqs; /* Number of dquots in core */ |
413 | struct qc_type_state s_state[MAXQUOTAS]; /* Per quota type information */ |
414 | }; |
415 | |
416 | /* Structure for communicating via ->set_info */ |
417 | struct qc_info { |
418 | int i_fieldmask; /* mask of fields to change in ->set_info() */ |
419 | unsigned int i_flags; /* Flags QCI_* */ |
420 | unsigned int i_spc_timelimit; /* Time after which space softlimit is |
421 | * enforced */ |
422 | unsigned int i_ino_timelimit; /* Ditto for inode softlimit */ |
423 | unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */ |
424 | unsigned int i_spc_warnlimit; /* Limit for number of space warnings */ |
425 | unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */ |
426 | unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */ |
427 | }; |
428 | |
429 | /* Operations handling requests from userspace */ |
430 | struct quotactl_ops { |
431 | int (*quota_on)(struct super_block *, int, int, const struct path *); |
432 | int (*quota_off)(struct super_block *, int); |
433 | int (*quota_enable)(struct super_block *, unsigned int); |
434 | int (*quota_disable)(struct super_block *, unsigned int); |
435 | int (*quota_sync)(struct super_block *, int); |
436 | int (*set_info)(struct super_block *, int, struct qc_info *); |
437 | int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); |
438 | int (*get_nextdqblk)(struct super_block *, struct kqid *, |
439 | struct qc_dqblk *); |
440 | int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); |
441 | int (*get_state)(struct super_block *, struct qc_state *); |
442 | int (*rm_xquota)(struct super_block *, unsigned int); |
443 | }; |
444 | |
445 | struct quota_format_type { |
446 | int qf_fmt_id; /* Quota format id */ |
447 | const struct quota_format_ops *qf_ops; /* Operations of format */ |
448 | struct module *qf_owner; /* Module implementing quota format */ |
449 | struct quota_format_type *qf_next; |
450 | }; |
451 | |
452 | /** |
453 | * Quota state flags - they come in three flavors - for users, groups and projects. |
454 | * |
455 | * Actual typed flags layout: |
456 | * USRQUOTA GRPQUOTA PRJQUOTA |
457 | * DQUOT_USAGE_ENABLED 0x0001 0x0002 0x0004 |
458 | * DQUOT_LIMITS_ENABLED 0x0008 0x0010 0x0020 |
459 | * DQUOT_SUSPENDED 0x0040 0x0080 0x0100 |
460 | * |
461 | * Following bits are used for non-typed flags: |
462 | * DQUOT_QUOTA_SYS_FILE 0x0200 |
463 | * DQUOT_NEGATIVE_USAGE 0x0400 |
464 | * DQUOT_NOLIST_DIRTY 0x0800 |
465 | */ |
466 | enum { |
467 | _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */ |
468 | _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */ |
469 | _DQUOT_SUSPENDED, /* User diskquotas are off, but |
470 | * we have necessary info in |
471 | * memory to turn them on */ |
472 | _DQUOT_STATE_FLAGS |
473 | }; |
474 | #define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS) |
475 | #define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS) |
476 | #define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS) |
477 | #define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \ |
478 | DQUOT_SUSPENDED) |
479 | /* Other quota flags */ |
480 | #define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS) |
481 | #define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST) |
482 | /* Quota file is a special |
483 | * system file and user cannot |
484 | * touch it. Filesystem is |
485 | * responsible for setting |
486 | * S_NOQUOTA, S_NOATIME flags |
487 | */ |
488 | #define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1)) |
489 | /* Allow negative quota usage */ |
490 | /* Do not track dirty dquots in a list */ |
491 | #define DQUOT_NOLIST_DIRTY (1 << (DQUOT_STATE_LAST + 2)) |
492 | |
493 | static inline unsigned int dquot_state_flag(unsigned int flags, int type) |
494 | { |
495 | return flags << type; |
496 | } |
497 | |
498 | static inline unsigned int dquot_generic_flag(unsigned int flags, int type) |
499 | { |
500 | return (flags >> type) & DQUOT_STATE_FLAGS; |
501 | } |
502 | |
503 | /* Bitmap of quota types where flag is set in flags */ |
504 | static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag) |
505 | { |
506 | BUILD_BUG_ON_NOT_POWER_OF_2(flag); |
507 | return (flags / flag) & ((1 << MAXQUOTAS) - 1); |
508 | } |
509 | |
510 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
511 | extern void quota_send_warning(struct kqid qid, dev_t dev, |
512 | const char warntype); |
513 | #else |
514 | static inline void quota_send_warning(struct kqid qid, dev_t dev, |
515 | const char warntype) |
516 | { |
517 | return; |
518 | } |
519 | #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */ |
520 | |
521 | struct quota_info { |
522 | unsigned int flags; /* Flags for diskquotas on this device */ |
523 | struct rw_semaphore dqio_sem; /* Lock quota file while I/O in progress */ |
524 | struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */ |
525 | struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */ |
526 | const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */ |
527 | }; |
528 | |
529 | int register_quota_format(struct quota_format_type *fmt); |
530 | void unregister_quota_format(struct quota_format_type *fmt); |
531 | |
532 | struct quota_module_name { |
533 | int qm_fmt_id; |
534 | char *qm_mod_name; |
535 | }; |
536 | |
537 | #define INIT_QUOTA_MODULE_NAMES {\ |
538 | {QFMT_VFS_OLD, "quota_v1"},\ |
539 | {QFMT_VFS_V0, "quota_v2"},\ |
540 | {QFMT_VFS_V1, "quota_v2"},\ |
541 | {0, NULL}} |
542 | |
543 | #endif /* _QUOTA_ */ |
544 | |