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1da177e4 LT |
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. | |
1da177e4 | 31 | */ |
1da177e4 LT |
32 | #ifndef _LINUX_QUOTA_ |
33 | #define _LINUX_QUOTA_ | |
34 | ||
8b91de2e | 35 | #include <linux/list.h> |
0409d3a3 | 36 | #include <linux/mutex.h> |
8b91de2e MW |
37 | #include <linux/rwsem.h> |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/wait.h> | |
f32764bd | 40 | #include <linux/percpu_counter.h> |
1da177e4 LT |
41 | |
42 | #include <linux/dqblk_xfs.h> | |
43 | #include <linux/dqblk_v1.h> | |
44 | #include <linux/dqblk_v2.h> | |
45 | ||
60063497 | 46 | #include <linux/atomic.h> |
e8a3e471 EB |
47 | #include <linux/uidgid.h> |
48 | #include <linux/projid.h> | |
607ca46e | 49 | #include <uapi/linux/quota.h> |
e8a3e471 EB |
50 | |
51 | #undef USRQUOTA | |
52 | #undef GRPQUOTA | |
847aac64 | 53 | #undef PRJQUOTA |
e8a3e471 EB |
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 | }; | |
8b91de2e | 59 | |
2c5f648a JK |
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 | ||
74abb989 | 65 | typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */ |
db49d2df | 66 | typedef long long qsize_t; /* Type in which we store sizes */ |
74abb989 | 67 | |
e8a3e471 EB |
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 | 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, qid); | |
106 | break; | |
107 | case GRPQUOTA: | |
108 | kqid.gid = make_kgid(from, qid); | |
109 | break; | |
110 | case PRJQUOTA: | |
111 | kqid.projid = make_kprojid(from, 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 | ||
acd64b73 MF |
183 | extern spinlock_t dq_data_lock; |
184 | ||
1da177e4 | 185 | /* Maximal numbers of writes for quota operation (insert/delete/update) |
4e5117ba JK |
186 | * (over VFS all formats) */ |
187 | #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC) | |
188 | #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE) | |
189 | #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC) | |
190 | #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE) | |
1da177e4 LT |
191 | |
192 | /* | |
193 | * Data for one user/group kept in memory | |
194 | */ | |
195 | struct mem_dqblk { | |
12095460 JK |
196 | qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */ |
197 | qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */ | |
1da177e4 | 198 | qsize_t dqb_curspace; /* current used space */ |
f18df228 | 199 | qsize_t dqb_rsvspace; /* current reserved space for delalloc*/ |
12095460 JK |
200 | qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */ |
201 | qsize_t dqb_isoftlimit; /* preferred inode limit */ | |
202 | qsize_t dqb_curinodes; /* current # allocated inodes */ | |
1da177e4 LT |
203 | time_t dqb_btime; /* time limit for excessive disk use */ |
204 | time_t dqb_itime; /* time limit for excessive inode use */ | |
205 | }; | |
206 | ||
207 | /* | |
208 | * Data for one quotafile kept in memory | |
209 | */ | |
210 | struct quota_format_type; | |
211 | ||
212 | struct mem_dqinfo { | |
213 | struct quota_format_type *dqi_format; | |
0ff5af83 JK |
214 | int dqi_fmt_id; /* Id of the dqi_format - used when turning |
215 | * quotas on after remount RW */ | |
1da177e4 LT |
216 | struct list_head dqi_dirty_list; /* List of dirty dquots */ |
217 | unsigned long dqi_flags; | |
218 | unsigned int dqi_bgrace; | |
219 | unsigned int dqi_igrace; | |
b10a0819 JK |
220 | qsize_t dqi_max_spc_limit; |
221 | qsize_t dqi_max_ino_limit; | |
e3d4d56b | 222 | void *dqi_priv; |
1da177e4 LT |
223 | }; |
224 | ||
225 | struct super_block; | |
226 | ||
9c45101e JK |
227 | /* Mask for flags passed to userspace */ |
228 | #define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE) | |
229 | /* Mask for flags modifiable from userspace */ | |
230 | #define DQF_SETINFO_MASK DQF_ROOT_SQUASH | |
231 | ||
232 | enum { | |
233 | DQF_INFO_DIRTY_B = DQF_PRIVATE, | |
234 | }; | |
1da177e4 LT |
235 | #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */ |
236 | ||
237 | extern void mark_info_dirty(struct super_block *sb, int type); | |
03b06343 JK |
238 | static inline int info_dirty(struct mem_dqinfo *info) |
239 | { | |
240 | return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags); | |
241 | } | |
1da177e4 | 242 | |
dde95888 DM |
243 | enum { |
244 | DQST_LOOKUPS, | |
245 | DQST_DROPS, | |
246 | DQST_READS, | |
247 | DQST_WRITES, | |
248 | DQST_CACHE_HITS, | |
249 | DQST_ALLOC_DQUOTS, | |
250 | DQST_FREE_DQUOTS, | |
251 | DQST_SYNCS, | |
252 | _DQST_DQSTAT_LAST | |
253 | }; | |
254 | ||
1da177e4 | 255 | struct dqstats { |
dde95888 | 256 | int stat[_DQST_DQSTAT_LAST]; |
f32764bd | 257 | struct percpu_counter counter[_DQST_DQSTAT_LAST]; |
1da177e4 LT |
258 | }; |
259 | ||
dde95888 | 260 | extern struct dqstats *dqstats_pcpu; |
1da177e4 LT |
261 | extern struct dqstats dqstats; |
262 | ||
dde95888 DM |
263 | static inline void dqstats_inc(unsigned int type) |
264 | { | |
f32764bd | 265 | percpu_counter_inc(&dqstats.counter[type]); |
dde95888 DM |
266 | } |
267 | ||
268 | static inline void dqstats_dec(unsigned int type) | |
269 | { | |
f32764bd | 270 | percpu_counter_dec(&dqstats.counter[type]); |
dde95888 DM |
271 | } |
272 | ||
1da177e4 LT |
273 | #define DQ_MOD_B 0 /* dquot modified since read */ |
274 | #define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */ | |
275 | #define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */ | |
276 | #define DQ_FAKE_B 3 /* no limits only usage */ | |
277 | #define DQ_READ_B 4 /* dquot was read into memory */ | |
278 | #define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */ | |
4d59bce4 JK |
279 | #define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\ |
280 | * for the mask of entries set via SETQUOTA\ | |
281 | * quotactl. They are set under dq_data_lock\ | |
282 | * and the quota format handling dquot can\ | |
283 | * clear them when it sees fit. */ | |
1da177e4 LT |
284 | |
285 | struct dquot { | |
286 | struct hlist_node dq_hash; /* Hash list in memory */ | |
287 | struct list_head dq_inuse; /* List of all quotas */ | |
288 | struct list_head dq_free; /* Free list element */ | |
289 | struct list_head dq_dirty; /* List of dirty dquots */ | |
d3be915f | 290 | struct mutex dq_lock; /* dquot IO lock */ |
1da177e4 LT |
291 | atomic_t dq_count; /* Use count */ |
292 | wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */ | |
293 | struct super_block *dq_sb; /* superblock this applies to */ | |
4c376dca | 294 | struct kqid dq_id; /* ID this applies to (uid, gid, projid) */ |
1da177e4 LT |
295 | loff_t dq_off; /* Offset of dquot on disk */ |
296 | unsigned long dq_flags; /* See DQ_* */ | |
1da177e4 LT |
297 | struct mem_dqblk dq_dqb; /* Diskquota usage */ |
298 | }; | |
299 | ||
1da177e4 LT |
300 | /* Operations which must be implemented by each quota format */ |
301 | struct quota_format_ops { | |
302 | int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */ | |
303 | int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */ | |
304 | int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */ | |
305 | int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */ | |
306 | int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */ | |
307 | int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */ | |
308 | int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */ | |
be6257b2 | 309 | int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */ |
1da177e4 LT |
310 | }; |
311 | ||
312 | /* Operations working with dquots */ | |
313 | struct dquot_operations { | |
1da177e4 | 314 | int (*write_dquot) (struct dquot *); /* Ordinary dquot write */ |
74f783af JK |
315 | struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */ |
316 | void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */ | |
1da177e4 LT |
317 | int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */ |
318 | int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ | |
319 | int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ | |
320 | int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ | |
fd8fbfc1 DM |
321 | /* get reserved quota for delayed alloc, value returned is managed by |
322 | * quota code only */ | |
323 | qsize_t *(*get_reserved_space) (struct inode *); | |
847aac64 | 324 | int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */ |
be6257b2 JK |
325 | /* Get next ID with active quota structure */ |
326 | int (*get_next_id) (struct super_block *sb, struct kqid *qid); | |
1da177e4 LT |
327 | }; |
328 | ||
f00c9e44 JK |
329 | struct path; |
330 | ||
14bf61ff JK |
331 | /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */ |
332 | struct qc_dqblk { | |
333 | int d_fieldmask; /* mask of fields to change in ->set_dqblk() */ | |
334 | u64 d_spc_hardlimit; /* absolute limit on used space */ | |
335 | u64 d_spc_softlimit; /* preferred limit on used space */ | |
336 | u64 d_ino_hardlimit; /* maximum # allocated inodes */ | |
337 | u64 d_ino_softlimit; /* preferred inode limit */ | |
338 | u64 d_space; /* Space owned by the user */ | |
339 | u64 d_ino_count; /* # inodes owned by the user */ | |
340 | s64 d_ino_timer; /* zero if within inode limits */ | |
341 | /* if not, we refuse service */ | |
342 | s64 d_spc_timer; /* similar to above; for space */ | |
343 | int d_ino_warns; /* # warnings issued wrt num inodes */ | |
344 | int d_spc_warns; /* # warnings issued wrt used space */ | |
345 | u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */ | |
346 | u64 d_rt_spc_softlimit; /* preferred limit on RT space */ | |
347 | u64 d_rt_space; /* realtime space owned */ | |
348 | s64 d_rt_spc_timer; /* similar to above; for RT space */ | |
349 | int d_rt_spc_warns; /* # warnings issued wrt RT space */ | |
350 | }; | |
351 | ||
5eacb2ac JK |
352 | /* |
353 | * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for | |
354 | * ->set_info() in struct qc_info | |
355 | */ | |
14bf61ff JK |
356 | #define QC_INO_SOFT (1<<0) |
357 | #define QC_INO_HARD (1<<1) | |
358 | #define QC_SPC_SOFT (1<<2) | |
359 | #define QC_SPC_HARD (1<<3) | |
360 | #define QC_RT_SPC_SOFT (1<<4) | |
361 | #define QC_RT_SPC_HARD (1<<5) | |
362 | #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \ | |
363 | QC_RT_SPC_SOFT | QC_RT_SPC_HARD) | |
364 | #define QC_SPC_TIMER (1<<6) | |
365 | #define QC_INO_TIMER (1<<7) | |
366 | #define QC_RT_SPC_TIMER (1<<8) | |
367 | #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER) | |
368 | #define QC_SPC_WARNS (1<<9) | |
369 | #define QC_INO_WARNS (1<<10) | |
370 | #define QC_RT_SPC_WARNS (1<<11) | |
371 | #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS) | |
372 | #define QC_SPACE (1<<12) | |
373 | #define QC_INO_COUNT (1<<13) | |
374 | #define QC_RT_SPACE (1<<14) | |
375 | #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE) | |
5eacb2ac | 376 | #define QC_FLAGS (1<<15) |
14bf61ff | 377 | |
0a240339 JK |
378 | #define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */ |
379 | #define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */ | |
380 | #define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */ | |
381 | #define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */ | |
382 | ||
383 | /* Structures for communicating via ->get_state */ | |
384 | struct qc_type_state { | |
385 | unsigned int flags; /* Flags QCI_* */ | |
386 | unsigned int spc_timelimit; /* Time after which space softlimit is | |
387 | * enforced */ | |
388 | unsigned int ino_timelimit; /* Ditto for inode softlimit */ | |
389 | unsigned int rt_spc_timelimit; /* Ditto for real-time space */ | |
390 | unsigned int spc_warnlimit; /* Limit for number of space warnings */ | |
391 | unsigned int ino_warnlimit; /* Ditto for inodes */ | |
392 | unsigned int rt_spc_warnlimit; /* Ditto for real-time space */ | |
393 | unsigned long long ino; /* Inode number of quota file */ | |
394 | blkcnt_t blocks; /* Number of 512-byte blocks in the file */ | |
395 | blkcnt_t nextents; /* Number of extents in the file */ | |
396 | }; | |
397 | ||
398 | struct qc_state { | |
399 | unsigned int s_incoredqs; /* Number of dquots in core */ | |
400 | /* | |
401 | * Per quota type information. The array should really have | |
402 | * max(MAXQUOTAS, XQM_MAXQUOTAS) entries. BUILD_BUG_ON in | |
403 | * quota_getinfo() makes sure XQM_MAXQUOTAS is large enough. Once VFS | |
404 | * supports project quotas, this can be changed to MAXQUOTAS | |
405 | */ | |
406 | struct qc_type_state s_state[XQM_MAXQUOTAS]; | |
407 | }; | |
408 | ||
5eacb2ac JK |
409 | /* Structure for communicating via ->set_info */ |
410 | struct qc_info { | |
411 | int i_fieldmask; /* mask of fields to change in ->set_info() */ | |
412 | unsigned int i_flags; /* Flags QCI_* */ | |
413 | unsigned int i_spc_timelimit; /* Time after which space softlimit is | |
414 | * enforced */ | |
415 | unsigned int i_ino_timelimit; /* Ditto for inode softlimit */ | |
416 | unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */ | |
417 | unsigned int i_spc_warnlimit; /* Limit for number of space warnings */ | |
418 | unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */ | |
419 | unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */ | |
420 | }; | |
14bf61ff | 421 | |
1da177e4 LT |
422 | /* Operations handling requests from userspace */ |
423 | struct quotactl_ops { | |
f00c9e44 | 424 | int (*quota_on)(struct super_block *, int, int, struct path *); |
307ae18a | 425 | int (*quota_off)(struct super_block *, int); |
38e478c4 JK |
426 | int (*quota_enable)(struct super_block *, unsigned int); |
427 | int (*quota_disable)(struct super_block *, unsigned int); | |
ceed1723 | 428 | int (*quota_sync)(struct super_block *, int); |
5eacb2ac | 429 | int (*set_info)(struct super_block *, int, struct qc_info *); |
14bf61ff | 430 | int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); |
8b375249 ES |
431 | int (*get_nextdqblk)(struct super_block *, struct kqid *, |
432 | struct qc_dqblk *); | |
14bf61ff | 433 | int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); |
0a240339 | 434 | int (*get_state)(struct super_block *, struct qc_state *); |
9da93f9b | 435 | int (*rm_xquota)(struct super_block *, unsigned int); |
1da177e4 LT |
436 | }; |
437 | ||
438 | struct quota_format_type { | |
439 | int qf_fmt_id; /* Quota format id */ | |
1472da5f | 440 | const struct quota_format_ops *qf_ops; /* Operations of format */ |
1da177e4 LT |
441 | struct module *qf_owner; /* Module implementing quota format */ |
442 | struct quota_format_type *qf_next; | |
443 | }; | |
444 | ||
78197024 KK |
445 | /** |
446 | * Quota state flags - they actually come in two flavors - for users and groups. | |
447 | * | |
448 | * Actual typed flags layout: | |
449 | * USRQUOTA GRPQUOTA | |
450 | * DQUOT_USAGE_ENABLED 0x0001 0x0002 | |
451 | * DQUOT_LIMITS_ENABLED 0x0004 0x0008 | |
452 | * DQUOT_SUSPENDED 0x0010 0x0020 | |
453 | * | |
454 | * Following bits are used for non-typed flags: | |
455 | * DQUOT_QUOTA_SYS_FILE 0x0040 | |
456 | * DQUOT_NEGATIVE_USAGE 0x0080 | |
457 | */ | |
f55abc0f JK |
458 | enum { |
459 | _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */ | |
460 | _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */ | |
461 | _DQUOT_SUSPENDED, /* User diskquotas are off, but | |
0ff5af83 JK |
462 | * we have necessary info in |
463 | * memory to turn them on */ | |
f55abc0f JK |
464 | _DQUOT_STATE_FLAGS |
465 | }; | |
78197024 KK |
466 | #define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS) |
467 | #define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS) | |
468 | #define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS) | |
f55abc0f JK |
469 | #define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \ |
470 | DQUOT_SUSPENDED) | |
ca785ec6 | 471 | /* Other quota flags */ |
ad1e6e8d DM |
472 | #define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS) |
473 | #define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST) | |
474 | /* Quota file is a special | |
ca785ec6 JK |
475 | * system file and user cannot |
476 | * touch it. Filesystem is | |
477 | * responsible for setting | |
478 | * S_NOQUOTA, S_NOATIME flags | |
479 | */ | |
ad1e6e8d DM |
480 | #define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1)) |
481 | /* Allow negative quota usage */ | |
f55abc0f JK |
482 | static inline unsigned int dquot_state_flag(unsigned int flags, int type) |
483 | { | |
78197024 | 484 | return flags << type; |
f55abc0f JK |
485 | } |
486 | ||
487 | static inline unsigned int dquot_generic_flag(unsigned int flags, int type) | |
488 | { | |
78197024 KK |
489 | return (flags >> type) & DQUOT_STATE_FLAGS; |
490 | } | |
491 | ||
492 | /* Bitmap of quota types where flag is set in flags */ | |
493 | static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag) | |
494 | { | |
495 | BUILD_BUG_ON_NOT_POWER_OF_2(flag); | |
496 | return (flags / flag) & ((1 << MAXQUOTAS) - 1); | |
f55abc0f | 497 | } |
1da177e4 | 498 | |
86e931a3 | 499 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
431f1974 | 500 | extern void quota_send_warning(struct kqid qid, dev_t dev, |
86e931a3 SW |
501 | const char warntype); |
502 | #else | |
431f1974 | 503 | static inline void quota_send_warning(struct kqid qid, dev_t dev, |
86e931a3 SW |
504 | const char warntype) |
505 | { | |
506 | return; | |
507 | } | |
508 | #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */ | |
509 | ||
1da177e4 LT |
510 | struct quota_info { |
511 | unsigned int flags; /* Flags for diskquotas on this device */ | |
d3be915f IM |
512 | struct mutex dqio_mutex; /* lock device while I/O in progress */ |
513 | struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */ | |
1da177e4 | 514 | struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */ |
1da177e4 | 515 | struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */ |
1472da5f | 516 | const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */ |
1da177e4 LT |
517 | }; |
518 | ||
1da177e4 LT |
519 | int register_quota_format(struct quota_format_type *fmt); |
520 | void unregister_quota_format(struct quota_format_type *fmt); | |
521 | ||
522 | struct quota_module_name { | |
523 | int qm_fmt_id; | |
524 | char *qm_mod_name; | |
525 | }; | |
526 | ||
527 | #define INIT_QUOTA_MODULE_NAMES {\ | |
528 | {QFMT_VFS_OLD, "quota_v1"},\ | |
529 | {QFMT_VFS_V0, "quota_v2"},\ | |
c3ad83d9 | 530 | {QFMT_VFS_V1, "quota_v2"},\ |
1da177e4 LT |
531 | {0, NULL}} |
532 | ||
1da177e4 | 533 | #endif /* _QUOTA_ */ |