blob: 55107a8ff8877f270b02fc67a689eac992f2ea74 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#ifndef _LINUX_QUOTA_
33#define _LINUX_QUOTA_
34
Matthew Wilcox8b91de22008-02-26 09:53:20 -050035#include <linux/list.h>
David Woodhouse0409d3a2006-04-25 14:52:13 +010036#include <linux/mutex.h>
Matthew Wilcox8b91de22008-02-26 09:53:20 -050037#include <linux/rwsem.h>
38#include <linux/spinlock.h>
39#include <linux/wait.h>
Dmitry Monakhovf32764b2010-05-26 23:21:58 +020040#include <linux/percpu_counter.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include <linux/dqblk_xfs.h>
43#include <linux/dqblk_v1.h>
44#include <linux/dqblk_v2.h>
45
Arun Sharma600634972011-07-26 16:09:06 -070046#include <linux/atomic.h>
Eric W. Biedermane8a3e472012-09-16 01:11:45 -070047#include <linux/uidgid.h>
48#include <linux/projid.h>
David Howells607ca462012-10-13 10:46:48 +010049#include <uapi/linux/quota.h>
Eric W. Biedermane8a3e472012-09-16 01:11:45 -070050
51#undef USRQUOTA
52#undef GRPQUOTA
Li Xi847aac62015-03-19 04:04:53 +090053#undef PRJQUOTA
Eric W. Biedermane8a3e472012-09-16 01:11:45 -070054enum 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};
Matthew Wilcox8b91de22008-02-26 09:53:20 -050059
Jan Kara2c5f6482014-09-30 10:43:09 +020060/* 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
Jan Kara74abb982008-07-25 01:46:51 -070065typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
Jan Karadb49d2d2008-10-01 18:21:39 +020066typedef long long qsize_t; /* Type in which we store sizes */
Jan Kara74abb982008-07-25 01:46:51 -070067
Eric W. Biedermane8a3e472012-09-16 01:11:45 -070068struct 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
77extern bool qid_eq(struct kqid left, struct kqid right);
78extern bool qid_lt(struct kqid left, struct kqid right);
79extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
80extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
81extern 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 */
97static 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 */
125static 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 */
150static 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 */
162static 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 */
174static 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
Eric W. Biedermand49d3762016-06-30 16:31:01 -0500182/**
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 */
187static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
188{
189 return from_kqid(ns, qid) != (qid_t) -1;
190}
191
Eric W. Biedermane8a3e472012-09-16 01:11:45 -0700192
Mike Frysingeracd64b72007-05-08 00:31:51 -0700193extern spinlock_t dq_data_lock;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195/* Maximal numbers of writes for quota operation (insert/delete/update)
Jan Kara4e5117b2005-06-23 22:01:03 -0700196 * (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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202/*
203 * Data for one user/group kept in memory
204 */
205struct mem_dqblk {
Jan Kara12095462008-08-20 14:45:12 +0200206 qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
207 qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 qsize_t dqb_curspace; /* current used space */
Mingming Caof18df222009-01-13 16:43:09 +0100209 qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
Jan Kara12095462008-08-20 14:45:12 +0200210 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 */
Arnd Bergmanne008bb62016-06-17 22:03:16 +0200213 time64_t dqb_btime; /* time limit for excessive disk use */
214 time64_t dqb_itime; /* time limit for excessive inode use */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215};
216
217/*
218 * Data for one quotafile kept in memory
219 */
220struct quota_format_type;
221
222struct mem_dqinfo {
223 struct quota_format_type *dqi_format;
Jan Kara0ff5af82008-04-28 02:14:33 -0700224 int dqi_fmt_id; /* Id of the dqi_format - used when turning
225 * quotas on after remount RW */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct list_head dqi_dirty_list; /* List of dirty dquots */
227 unsigned long dqi_flags;
228 unsigned int dqi_bgrace;
229 unsigned int dqi_igrace;
Jan Karab10a0812014-10-09 16:54:13 +0200230 qsize_t dqi_max_spc_limit;
231 qsize_t dqi_max_ino_limit;
Jan Karae3d4d562008-10-02 18:44:14 +0200232 void *dqi_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233};
234
235struct super_block;
236
Jan Kara9c451012014-11-19 09:21:58 +0100237/* 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
242enum {
243 DQF_INFO_DIRTY_B = DQF_PRIVATE,
244};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
246
247extern void mark_info_dirty(struct super_block *sb, int type);
Jan Kara03b06342008-07-25 01:46:52 -0700248static inline int info_dirty(struct mem_dqinfo *info)
249{
250 return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
251}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400253enum {
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263};
264
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400265struct dqstats {
266 int stat[_DQST_DQSTAT_LAST];
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200267 struct percpu_counter counter[_DQST_DQSTAT_LAST];
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400268};
269
270extern struct dqstats *dqstats_pcpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271extern struct dqstats dqstats;
272
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400273static inline void dqstats_inc(unsigned int type)
274{
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200275 percpu_counter_inc(&dqstats.counter[type]);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400276}
277
278static inline void dqstats_dec(unsigned int type)
279{
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200280 percpu_counter_dec(&dqstats.counter[type]);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400281}
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283#define DQ_MOD_B 0 /* dquot modified since read */
284#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
285#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
286#define DQ_FAKE_B 3 /* no limits only usage */
287#define DQ_READ_B 4 /* dquot was read into memory */
288#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
Jan Kara4d59bce2008-10-02 16:48:10 +0200289#define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\
290 * for the mask of entries set via SETQUOTA\
291 * quotactl. They are set under dq_data_lock\
292 * and the quota format handling dquot can\
293 * clear them when it sees fit. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295struct dquot {
296 struct hlist_node dq_hash; /* Hash list in memory */
297 struct list_head dq_inuse; /* List of all quotas */
298 struct list_head dq_free; /* Free list element */
299 struct list_head dq_dirty; /* List of dirty dquots */
Ingo Molnard3be9152006-03-23 03:00:29 -0800300 struct mutex dq_lock; /* dquot IO lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 atomic_t dq_count; /* Use count */
302 wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
303 struct super_block *dq_sb; /* superblock this applies to */
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700304 struct kqid dq_id; /* ID this applies to (uid, gid, projid) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 loff_t dq_off; /* Offset of dquot on disk */
306 unsigned long dq_flags; /* See DQ_* */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 struct mem_dqblk dq_dqb; /* Diskquota usage */
308};
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310/* Operations which must be implemented by each quota format */
311struct quota_format_ops {
312 int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */
313 int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */
314 int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */
315 int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */
316 int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */
317 int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */
318 int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */
Jan Karabe6257b2016-01-25 19:24:50 +0100319 int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320};
321
322/* Operations working with dquots */
323struct dquot_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
Jan Kara74f783a2008-08-19 14:51:22 +0200325 struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */
326 void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */
328 int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
329 int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
330 int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +0300331 /* get reserved quota for delayed alloc, value returned is managed by
332 * quota code only */
333 qsize_t *(*get_reserved_space) (struct inode *);
Li Xi847aac62015-03-19 04:04:53 +0900334 int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
Jan Karabe6257b2016-01-25 19:24:50 +0100335 /* Get next ID with active quota structure */
336 int (*get_next_id) (struct super_block *sb, struct kqid *qid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337};
338
Jan Karaf00c9e42010-09-15 17:38:58 +0200339struct path;
340
Jan Kara14bf61f2014-10-09 16:03:13 +0200341/* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
342struct qc_dqblk {
343 int d_fieldmask; /* mask of fields to change in ->set_dqblk() */
344 u64 d_spc_hardlimit; /* absolute limit on used space */
345 u64 d_spc_softlimit; /* preferred limit on used space */
346 u64 d_ino_hardlimit; /* maximum # allocated inodes */
347 u64 d_ino_softlimit; /* preferred inode limit */
348 u64 d_space; /* Space owned by the user */
349 u64 d_ino_count; /* # inodes owned by the user */
350 s64 d_ino_timer; /* zero if within inode limits */
351 /* if not, we refuse service */
352 s64 d_spc_timer; /* similar to above; for space */
353 int d_ino_warns; /* # warnings issued wrt num inodes */
354 int d_spc_warns; /* # warnings issued wrt used space */
355 u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
356 u64 d_rt_spc_softlimit; /* preferred limit on RT space */
357 u64 d_rt_space; /* realtime space owned */
358 s64 d_rt_spc_timer; /* similar to above; for RT space */
359 int d_rt_spc_warns; /* # warnings issued wrt RT space */
360};
361
Jan Kara5eacb2a2014-12-16 12:03:51 +0100362/*
363 * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
364 * ->set_info() in struct qc_info
365 */
Jan Kara14bf61f2014-10-09 16:03:13 +0200366#define QC_INO_SOFT (1<<0)
367#define QC_INO_HARD (1<<1)
368#define QC_SPC_SOFT (1<<2)
369#define QC_SPC_HARD (1<<3)
370#define QC_RT_SPC_SOFT (1<<4)
371#define QC_RT_SPC_HARD (1<<5)
372#define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
373 QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
374#define QC_SPC_TIMER (1<<6)
375#define QC_INO_TIMER (1<<7)
376#define QC_RT_SPC_TIMER (1<<8)
377#define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
378#define QC_SPC_WARNS (1<<9)
379#define QC_INO_WARNS (1<<10)
380#define QC_RT_SPC_WARNS (1<<11)
381#define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
382#define QC_SPACE (1<<12)
383#define QC_INO_COUNT (1<<13)
384#define QC_RT_SPACE (1<<14)
385#define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
Jan Kara5eacb2a2014-12-16 12:03:51 +0100386#define QC_FLAGS (1<<15)
Jan Kara14bf61f2014-10-09 16:03:13 +0200387
Jan Kara0a2403392014-11-19 00:42:09 +0100388#define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */
389#define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */
390#define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */
391#define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */
392
393/* Structures for communicating via ->get_state */
394struct qc_type_state {
395 unsigned int flags; /* Flags QCI_* */
396 unsigned int spc_timelimit; /* Time after which space softlimit is
397 * enforced */
398 unsigned int ino_timelimit; /* Ditto for inode softlimit */
399 unsigned int rt_spc_timelimit; /* Ditto for real-time space */
400 unsigned int spc_warnlimit; /* Limit for number of space warnings */
401 unsigned int ino_warnlimit; /* Ditto for inodes */
402 unsigned int rt_spc_warnlimit; /* Ditto for real-time space */
403 unsigned long long ino; /* Inode number of quota file */
404 blkcnt_t blocks; /* Number of 512-byte blocks in the file */
405 blkcnt_t nextents; /* Number of extents in the file */
406};
407
408struct qc_state {
409 unsigned int s_incoredqs; /* Number of dquots in core */
410 /*
411 * Per quota type information. The array should really have
412 * max(MAXQUOTAS, XQM_MAXQUOTAS) entries. BUILD_BUG_ON in
413 * quota_getinfo() makes sure XQM_MAXQUOTAS is large enough. Once VFS
414 * supports project quotas, this can be changed to MAXQUOTAS
415 */
416 struct qc_type_state s_state[XQM_MAXQUOTAS];
417};
418
Jan Kara5eacb2a2014-12-16 12:03:51 +0100419/* Structure for communicating via ->set_info */
420struct qc_info {
421 int i_fieldmask; /* mask of fields to change in ->set_info() */
422 unsigned int i_flags; /* Flags QCI_* */
423 unsigned int i_spc_timelimit; /* Time after which space softlimit is
424 * enforced */
425 unsigned int i_ino_timelimit; /* Ditto for inode softlimit */
426 unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
427 unsigned int i_spc_warnlimit; /* Limit for number of space warnings */
428 unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */
429 unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */
430};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432/* Operations handling requests from userspace */
433struct quotactl_ops {
Jan Karaf00c9e42010-09-15 17:38:58 +0200434 int (*quota_on)(struct super_block *, int, int, struct path *);
Christoph Hellwig307ae182010-05-19 07:16:43 -0400435 int (*quota_off)(struct super_block *, int);
Jan Kara38e478c2014-10-08 15:56:21 +0200436 int (*quota_enable)(struct super_block *, unsigned int);
437 int (*quota_disable)(struct super_block *, unsigned int);
Jan Karaceed1722012-07-03 16:45:28 +0200438 int (*quota_sync)(struct super_block *, int);
Jan Kara5eacb2a2014-12-16 12:03:51 +0100439 int (*set_info)(struct super_block *, int, struct qc_info *);
Jan Kara14bf61f2014-10-09 16:03:13 +0200440 int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
Eric Sandeen8b375242016-02-08 11:21:50 +1100441 int (*get_nextdqblk)(struct super_block *, struct kqid *,
442 struct qc_dqblk *);
Jan Kara14bf61f2014-10-09 16:03:13 +0200443 int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
Jan Kara0a2403392014-11-19 00:42:09 +0100444 int (*get_state)(struct super_block *, struct qc_state *);
Eric Sandeen9da93f92014-05-05 17:25:50 +1000445 int (*rm_xquota)(struct super_block *, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446};
447
448struct quota_format_type {
449 int qf_fmt_id; /* Quota format id */
Alexey Dobriyan1472da52009-10-16 15:26:03 +0400450 const struct quota_format_ops *qf_ops; /* Operations of format */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 struct module *qf_owner; /* Module implementing quota format */
452 struct quota_format_type *qf_next;
453};
454
Konstantin Khlebnikov78197022015-02-12 19:08:16 +0300455/**
456 * Quota state flags - they actually come in two flavors - for users and groups.
457 *
458 * Actual typed flags layout:
459 * USRQUOTA GRPQUOTA
460 * DQUOT_USAGE_ENABLED 0x0001 0x0002
461 * DQUOT_LIMITS_ENABLED 0x0004 0x0008
462 * DQUOT_SUSPENDED 0x0010 0x0020
463 *
464 * Following bits are used for non-typed flags:
465 * DQUOT_QUOTA_SYS_FILE 0x0040
466 * DQUOT_NEGATIVE_USAGE 0x0080
467 */
Jan Karaf55abc02008-08-20 17:50:32 +0200468enum {
469 _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
470 _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
471 _DQUOT_SUSPENDED, /* User diskquotas are off, but
Jan Kara0ff5af82008-04-28 02:14:33 -0700472 * we have necessary info in
473 * memory to turn them on */
Jan Karaf55abc02008-08-20 17:50:32 +0200474 _DQUOT_STATE_FLAGS
475};
Konstantin Khlebnikov78197022015-02-12 19:08:16 +0300476#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS)
477#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
478#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
Jan Karaf55abc02008-08-20 17:50:32 +0200479#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
480 DQUOT_SUSPENDED)
Jan Karaca785ec2008-09-30 17:53:37 +0200481/* Other quota flags */
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +0300482#define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS)
483#define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST)
484 /* Quota file is a special
Jan Karaca785ec2008-09-30 17:53:37 +0200485 * system file and user cannot
486 * touch it. Filesystem is
487 * responsible for setting
488 * S_NOQUOTA, S_NOATIME flags
489 */
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +0300490#define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1))
491 /* Allow negative quota usage */
Jan Karaf55abc02008-08-20 17:50:32 +0200492static inline unsigned int dquot_state_flag(unsigned int flags, int type)
493{
Konstantin Khlebnikov78197022015-02-12 19:08:16 +0300494 return flags << type;
Jan Karaf55abc02008-08-20 17:50:32 +0200495}
496
497static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
498{
Konstantin Khlebnikov78197022015-02-12 19:08:16 +0300499 return (flags >> type) & DQUOT_STATE_FLAGS;
500}
501
502/* Bitmap of quota types where flag is set in flags */
503static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
504{
505 BUILD_BUG_ON_NOT_POWER_OF_2(flag);
506 return (flags / flag) & ((1 << MAXQUOTAS) - 1);
Jan Karaf55abc02008-08-20 17:50:32 +0200507}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Steven Whitehouse86e931a2009-09-28 12:35:17 +0100509#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
Eric W. Biederman431f1972012-09-16 02:32:43 -0700510extern void quota_send_warning(struct kqid qid, dev_t dev,
Steven Whitehouse86e931a2009-09-28 12:35:17 +0100511 const char warntype);
512#else
Eric W. Biederman431f1972012-09-16 02:32:43 -0700513static inline void quota_send_warning(struct kqid qid, dev_t dev,
Steven Whitehouse86e931a2009-09-28 12:35:17 +0100514 const char warntype)
515{
516 return;
517}
518#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520struct quota_info {
521 unsigned int flags; /* Flags for diskquotas on this device */
Ingo Molnard3be9152006-03-23 03:00:29 -0800522 struct mutex dqio_mutex; /* lock device while I/O in progress */
523 struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
Alexey Dobriyan1472da52009-10-16 15:26:03 +0400526 const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527};
528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529int register_quota_format(struct quota_format_type *fmt);
530void unregister_quota_format(struct quota_format_type *fmt);
531
532struct 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"},\
Theodore Ts'oc3ad83d2013-01-24 23:24:56 -0500540 {QFMT_VFS_V1, "quota_v2"},\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 {0, NULL}}
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543#endif /* _QUOTA_ */