]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/quota.h
Merge tag 'sound-4.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[mirror_ubuntu-artful-kernel.git] / include / linux / quota.h
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 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
183 extern spinlock_t dq_data_lock;
184
185 /* Maximal numbers of writes for quota operation (insert/delete/update)
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)
191
192 /*
193 * Data for one user/group kept in memory
194 */
195 struct mem_dqblk {
196 qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
197 qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
198 qsize_t dqb_curspace; /* current used space */
199 qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
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 */
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;
214 int dqi_fmt_id; /* Id of the dqi_format - used when turning
215 * quotas on after remount RW */
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;
220 qsize_t dqi_max_spc_limit;
221 qsize_t dqi_max_ino_limit;
222 void *dqi_priv;
223 };
224
225 struct super_block;
226
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 };
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);
238 static inline int info_dirty(struct mem_dqinfo *info)
239 {
240 return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
241 }
242
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
255 struct dqstats {
256 int stat[_DQST_DQSTAT_LAST];
257 struct percpu_counter counter[_DQST_DQSTAT_LAST];
258 };
259
260 extern struct dqstats *dqstats_pcpu;
261 extern struct dqstats dqstats;
262
263 static inline void dqstats_inc(unsigned int type)
264 {
265 percpu_counter_inc(&dqstats.counter[type]);
266 }
267
268 static inline void dqstats_dec(unsigned int type)
269 {
270 percpu_counter_dec(&dqstats.counter[type]);
271 }
272
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) */
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. */
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 */
290 struct mutex dq_lock; /* dquot IO lock */
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 */
294 struct kqid dq_id; /* ID this applies to (uid, gid, projid) */
295 loff_t dq_off; /* Offset of dquot on disk */
296 unsigned long dq_flags; /* See DQ_* */
297 struct mem_dqblk dq_dqb; /* Diskquota usage */
298 };
299
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 */
309 int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */
310 };
311
312 /* Operations working with dquots */
313 struct dquot_operations {
314 int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
315 struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */
316 void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */
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" */
321 /* get reserved quota for delayed alloc, value returned is managed by
322 * quota code only */
323 qsize_t *(*get_reserved_space) (struct inode *);
324 int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
325 /* Get next ID with active quota structure */
326 int (*get_next_id) (struct super_block *sb, struct kqid *qid);
327 };
328
329 struct path;
330
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
352 /*
353 * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
354 * ->set_info() in struct qc_info
355 */
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)
376 #define QC_FLAGS (1<<15)
377
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
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 };
421
422 /* Operations handling requests from userspace */
423 struct quotactl_ops {
424 int (*quota_on)(struct super_block *, int, int, struct path *);
425 int (*quota_off)(struct super_block *, int);
426 int (*quota_enable)(struct super_block *, unsigned int);
427 int (*quota_disable)(struct super_block *, unsigned int);
428 int (*quota_sync)(struct super_block *, int);
429 int (*set_info)(struct super_block *, int, struct qc_info *);
430 int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
431 int (*get_nextdqblk)(struct super_block *, struct kqid *,
432 struct qc_dqblk *);
433 int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
434 int (*get_state)(struct super_block *, struct qc_state *);
435 int (*rm_xquota)(struct super_block *, unsigned int);
436 };
437
438 struct quota_format_type {
439 int qf_fmt_id; /* Quota format id */
440 const struct quota_format_ops *qf_ops; /* Operations of format */
441 struct module *qf_owner; /* Module implementing quota format */
442 struct quota_format_type *qf_next;
443 };
444
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 */
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
462 * we have necessary info in
463 * memory to turn them on */
464 _DQUOT_STATE_FLAGS
465 };
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)
469 #define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
470 DQUOT_SUSPENDED)
471 /* Other quota flags */
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
475 * system file and user cannot
476 * touch it. Filesystem is
477 * responsible for setting
478 * S_NOQUOTA, S_NOATIME flags
479 */
480 #define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1))
481 /* Allow negative quota usage */
482 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
483 {
484 return flags << type;
485 }
486
487 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
488 {
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);
497 }
498
499 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
500 extern void quota_send_warning(struct kqid qid, dev_t dev,
501 const char warntype);
502 #else
503 static inline void quota_send_warning(struct kqid qid, dev_t dev,
504 const char warntype)
505 {
506 return;
507 }
508 #endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
509
510 struct quota_info {
511 unsigned int flags; /* Flags for diskquotas on this device */
512 struct mutex dqio_mutex; /* lock device while I/O in progress */
513 struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
514 struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
515 struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
516 const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
517 };
518
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"},\
530 {QFMT_VFS_V1, "quota_v2"},\
531 {0, NULL}}
532
533 #endif /* _QUOTA_ */