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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
4 | * is implemented using the BSD system call interface as the means of | |
5 | * communication with the user level. This file contains the generic routines | |
6 | * called by the different filesystems on allocation of an inode or block. | |
7 | * These routines take care of the administration needed to have a consistent | |
8 | * diskquota tracking system. The ideas of both user and group quotas are based | |
9 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
10 | * implementation is based on one of the several variants of the LINUX | |
11 | * inode-subsystem with added complexity of the diskquota system. | |
27942ef5 | 12 | * |
1da177e4 LT |
13 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
14 | * | |
15 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
16 | * | |
17 | * Revised list management to avoid races | |
18 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
19 | * | |
20 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
21 | * As the consequence the locking was moved from dquot_decr_...(), | |
22 | * dquot_incr_...() to calling functions. | |
23 | * invalidate_dquots() now writes modified dquots. | |
24 | * Serialized quota_off() and quota_on() for mount point. | |
25 | * Fixed a few bugs in grow_dquots(). | |
26 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
27 | * quota files | |
28 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
29 | * add_dquot_ref() restarts after blocking | |
30 | * Added check for bogus uid and fixed check for group in quotactl. | |
31 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
32 | * | |
33 | * Used struct list_head instead of own list struct | |
34 | * Invalidation of referenced dquots is no longer possible | |
35 | * Improved free_dquots list management | |
36 | * Quota and i_blocks are now updated in one place to avoid races | |
37 | * Warnings are now delayed so we won't block in critical section | |
38 | * Write updated not to require dquot lock | |
39 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
40 | * | |
41 | * Added dynamic quota structure allocation | |
42 | * Jan Kara <jack@suse.cz> 12/2000 | |
43 | * | |
44 | * Rewritten quota interface. Implemented new quota format and | |
45 | * formats registering. | |
46 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
47 | * | |
48 | * New SMP locking. | |
49 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
50 | * | |
51 | * Added journalled quota support, fix lock inversion problems | |
52 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
53 | * | |
27942ef5 | 54 | * (C) Copyright 1994 - 1997 Marco van Wieringen |
1da177e4 LT |
55 | */ |
56 | ||
57 | #include <linux/errno.h> | |
58 | #include <linux/kernel.h> | |
59 | #include <linux/fs.h> | |
60 | #include <linux/mount.h> | |
61 | #include <linux/mm.h> | |
62 | #include <linux/time.h> | |
63 | #include <linux/types.h> | |
64 | #include <linux/string.h> | |
65 | #include <linux/fcntl.h> | |
66 | #include <linux/stat.h> | |
67 | #include <linux/tty.h> | |
68 | #include <linux/file.h> | |
69 | #include <linux/slab.h> | |
70 | #include <linux/sysctl.h> | |
1da177e4 LT |
71 | #include <linux/init.h> |
72 | #include <linux/module.h> | |
73 | #include <linux/proc_fs.h> | |
74 | #include <linux/security.h> | |
40401530 | 75 | #include <linux/sched.h> |
5b825c3a | 76 | #include <linux/cred.h> |
1da177e4 LT |
77 | #include <linux/kmod.h> |
78 | #include <linux/namei.h> | |
16f7e0fe | 79 | #include <linux/capability.h> |
be586bab | 80 | #include <linux/quotaops.h> |
3f1266f1 | 81 | #include <linux/blkdev.h> |
55fa6091 | 82 | #include "../internal.h" /* ugh */ |
1da177e4 | 83 | |
f3da9310 | 84 | #include <linux/uaccess.h> |
1da177e4 | 85 | |
1da177e4 | 86 | /* |
7b9ca4c6 JK |
87 | * There are five quota SMP locks: |
88 | * * dq_list_lock protects all lists with quotas and quota formats. | |
89 | * * dquot->dq_dqb_lock protects data from dq_dqb | |
90 | * * inode->i_lock protects inode->i_blocks, i_bytes and also guards | |
91 | * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that | |
92 | * dquot_transfer() can stabilize amount it transfers | |
93 | * * dq_data_lock protects mem_dqinfo structures and modifications of dquot | |
94 | * pointers in the inode | |
95 | * * dq_state_lock protects modifications of quota state (on quotaon and | |
96 | * quotaoff) and readers who care about latest values take it as well. | |
1da177e4 | 97 | * |
7b9ca4c6 JK |
98 | * The spinlock ordering is hence: |
99 | * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock, | |
cc33412f | 100 | * dq_list_lock > dq_state_lock |
1da177e4 LT |
101 | * |
102 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
103 | * the life of the dquot structure and so needn't to be protected by a lock | |
104 | * | |
b9ba6f94 NY |
105 | * Operation accessing dquots via inode pointers are protected by dquot_srcu. |
106 | * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and | |
107 | * synchronize_srcu(&dquot_srcu) is called after clearing pointers from | |
108 | * inode and before dropping dquot references to avoid use of dquots after | |
109 | * they are freed. dq_data_lock is used to serialize the pointer setting and | |
110 | * clearing operations. | |
26245c94 JK |
111 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that |
112 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
b9ba6f94 NY |
113 | * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they |
114 | * have to do all pointer modifications before dropping dq_data_lock. This makes | |
26245c94 JK |
115 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and |
116 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 117 | * |
5e8cb9b6 JK |
118 | * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to |
119 | * memory (or space for it is being allocated) on the first dqget(), when it is | |
120 | * being written out, and when it is being released on the last dqput(). The | |
121 | * allocation and release operations are serialized by the dq_lock and by | |
122 | * checking the use count in dquot_release(). | |
1da177e4 LT |
123 | * |
124 | * Lock ordering (including related VFS locks) is the following: | |
bc8230ee | 125 | * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem |
1da177e4 LT |
126 | */ |
127 | ||
c516610c JK |
128 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
129 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
130 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 131 | EXPORT_SYMBOL(dq_data_lock); |
b9ba6f94 | 132 | DEFINE_STATIC_SRCU(dquot_srcu); |
1da177e4 | 133 | |
503330f3 JK |
134 | static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); |
135 | ||
fb5ffb0e | 136 | void __quota_error(struct super_block *sb, const char *func, |
055adcbd | 137 | const char *fmt, ...) |
fb5ffb0e | 138 | { |
fb5ffb0e | 139 | if (printk_ratelimit()) { |
055adcbd JP |
140 | va_list args; |
141 | struct va_format vaf; | |
142 | ||
fb5ffb0e | 143 | va_start(args, fmt); |
055adcbd JP |
144 | |
145 | vaf.fmt = fmt; | |
146 | vaf.va = &args; | |
147 | ||
148 | printk(KERN_ERR "Quota error (device %s): %s: %pV\n", | |
149 | sb->s_id, func, &vaf); | |
150 | ||
fb5ffb0e JZ |
151 | va_end(args); |
152 | } | |
153 | } | |
154 | EXPORT_SYMBOL(__quota_error); | |
155 | ||
da8d1ba2 | 156 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 157 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 158 | #endif |
1da177e4 LT |
159 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
160 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
161 | ||
162 | /* SLAB cache for dquot structures */ | |
e18b890b | 163 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
164 | |
165 | int register_quota_format(struct quota_format_type *fmt) | |
166 | { | |
167 | spin_lock(&dq_list_lock); | |
168 | fmt->qf_next = quota_formats; | |
169 | quota_formats = fmt; | |
170 | spin_unlock(&dq_list_lock); | |
171 | return 0; | |
172 | } | |
08d0350c | 173 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
174 | |
175 | void unregister_quota_format(struct quota_format_type *fmt) | |
176 | { | |
177 | struct quota_format_type **actqf; | |
178 | ||
179 | spin_lock(&dq_list_lock); | |
268157ba JK |
180 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
181 | actqf = &(*actqf)->qf_next) | |
182 | ; | |
1da177e4 LT |
183 | if (*actqf) |
184 | *actqf = (*actqf)->qf_next; | |
185 | spin_unlock(&dq_list_lock); | |
186 | } | |
08d0350c | 187 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
188 | |
189 | static struct quota_format_type *find_quota_format(int id) | |
190 | { | |
191 | struct quota_format_type *actqf; | |
192 | ||
193 | spin_lock(&dq_list_lock); | |
268157ba JK |
194 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
195 | actqf = actqf->qf_next) | |
196 | ; | |
1da177e4 LT |
197 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
198 | int qm; | |
199 | ||
200 | spin_unlock(&dq_list_lock); | |
27942ef5 | 201 | |
268157ba JK |
202 | for (qm = 0; module_names[qm].qm_fmt_id && |
203 | module_names[qm].qm_fmt_id != id; qm++) | |
204 | ; | |
205 | if (!module_names[qm].qm_fmt_id || | |
206 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
207 | return NULL; |
208 | ||
209 | spin_lock(&dq_list_lock); | |
268157ba JK |
210 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
211 | actqf = actqf->qf_next) | |
212 | ; | |
1da177e4 LT |
213 | if (actqf && !try_module_get(actqf->qf_owner)) |
214 | actqf = NULL; | |
215 | } | |
216 | spin_unlock(&dq_list_lock); | |
217 | return actqf; | |
218 | } | |
219 | ||
220 | static void put_quota_format(struct quota_format_type *fmt) | |
221 | { | |
222 | module_put(fmt->qf_owner); | |
223 | } | |
224 | ||
225 | /* | |
226 | * Dquot List Management: | |
f44840ad CX |
227 | * The quota code uses four lists for dquot management: the inuse_list, |
228 | * free_dquots, dqi_dirty_list, and dquot_hash[] array. A single dquot | |
229 | * structure may be on some of those lists, depending on its current state. | |
1da177e4 LT |
230 | * |
231 | * All dquots are placed to the end of inuse_list when first created, and this | |
232 | * list is used for invalidate operation, which must look at every dquot. | |
233 | * | |
234 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
235 | * and this list is searched whenever we need an available dquot. Dquots are | |
236 | * removed from the list as soon as they are used again, and | |
237 | * dqstats.free_dquots gives the number of dquots on the list. When | |
238 | * dquot is invalidated it's completely released from memory. | |
239 | * | |
f44840ad CX |
240 | * Dirty dquots are added to the dqi_dirty_list of quota_info when mark |
241 | * dirtied, and this list is searched when writing dirty dquots back to | |
242 | * quota file. Note that some filesystems do dirty dquot tracking on their | |
243 | * own (e.g. in a journal) and thus don't use dqi_dirty_list. | |
244 | * | |
1da177e4 LT |
245 | * Dquots with a specific identity (device, type and id) are placed on |
246 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
247 | * mechanism to locate a specific dquot. | |
248 | */ | |
249 | ||
250 | static LIST_HEAD(inuse_list); | |
251 | static LIST_HEAD(free_dquots); | |
252 | static unsigned int dq_hash_bits, dq_hash_mask; | |
253 | static struct hlist_head *dquot_hash; | |
254 | ||
255 | struct dqstats dqstats; | |
08d0350c | 256 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 257 | |
0a5a9c72 | 258 | static qsize_t inode_get_rsv_space(struct inode *inode); |
7b9ca4c6 | 259 | static qsize_t __inode_get_rsv_space(struct inode *inode); |
6184fc0b | 260 | static int __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 261 | |
1da177e4 | 262 | static inline unsigned int |
1a06d420 | 263 | hashfn(const struct super_block *sb, struct kqid qid) |
1da177e4 | 264 | { |
1a06d420 EB |
265 | unsigned int id = from_kqid(&init_user_ns, qid); |
266 | int type = qid.type; | |
1da177e4 LT |
267 | unsigned long tmp; |
268 | ||
269 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
270 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Following list functions expect dq_list_lock to be held | |
275 | */ | |
276 | static inline void insert_dquot_hash(struct dquot *dquot) | |
277 | { | |
268157ba | 278 | struct hlist_head *head; |
1a06d420 | 279 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); |
1da177e4 LT |
280 | hlist_add_head(&dquot->dq_hash, head); |
281 | } | |
282 | ||
283 | static inline void remove_dquot_hash(struct dquot *dquot) | |
284 | { | |
285 | hlist_del_init(&dquot->dq_hash); | |
286 | } | |
287 | ||
7a2435d8 | 288 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
1a06d420 | 289 | struct kqid qid) |
1da177e4 | 290 | { |
1da177e4 LT |
291 | struct dquot *dquot; |
292 | ||
8c721cb0 | 293 | hlist_for_each_entry(dquot, dquot_hash+hashent, dq_hash) |
4c376dca | 294 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 | 295 | return dquot; |
8c721cb0 | 296 | |
dd6f3c6d | 297 | return NULL; |
1da177e4 LT |
298 | } |
299 | ||
300 | /* Add a dquot to the tail of the free list */ | |
301 | static inline void put_dquot_last(struct dquot *dquot) | |
302 | { | |
8e13059a | 303 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 304 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
305 | } |
306 | ||
307 | static inline void remove_free_dquot(struct dquot *dquot) | |
308 | { | |
309 | if (list_empty(&dquot->dq_free)) | |
310 | return; | |
311 | list_del_init(&dquot->dq_free); | |
dde95888 | 312 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
313 | } |
314 | ||
315 | static inline void put_inuse(struct dquot *dquot) | |
316 | { | |
317 | /* We add to the back of inuse list so we don't have to restart | |
318 | * when traversing this list and we block */ | |
8e13059a | 319 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 320 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
321 | } |
322 | ||
323 | static inline void remove_inuse(struct dquot *dquot) | |
324 | { | |
dde95888 | 325 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
326 | list_del(&dquot->dq_inuse); |
327 | } | |
328 | /* | |
329 | * End of list functions needing dq_list_lock | |
330 | */ | |
331 | ||
332 | static void wait_on_dquot(struct dquot *dquot) | |
333 | { | |
d3be915f IM |
334 | mutex_lock(&dquot->dq_lock); |
335 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
336 | } |
337 | ||
03f6e92b JK |
338 | static inline int dquot_dirty(struct dquot *dquot) |
339 | { | |
340 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
341 | } | |
342 | ||
343 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
344 | { | |
345 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
346 | } | |
1da177e4 | 347 | |
eabf290d | 348 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
349 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
350 | { | |
eabf290d DM |
351 | int ret = 1; |
352 | ||
4580b30e JK |
353 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
354 | return 0; | |
355 | ||
834057bf JK |
356 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
357 | return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); | |
358 | ||
eabf290d DM |
359 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ |
360 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
361 | return 1; | |
362 | ||
1da177e4 | 363 | spin_lock(&dq_list_lock); |
eabf290d | 364 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 365 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 366 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
367 | ret = 0; |
368 | } | |
1da177e4 | 369 | spin_unlock(&dq_list_lock); |
eabf290d | 370 | return ret; |
1da177e4 | 371 | } |
08d0350c | 372 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 373 | |
dc52dd3a DM |
374 | /* Dirtify all the dquots - this can block when journalling */ |
375 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
376 | { | |
377 | int ret, err, cnt; | |
378 | ||
379 | ret = err = 0; | |
380 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
381 | if (dquot[cnt]) | |
382 | /* Even in case of error we have to continue */ | |
383 | ret = mark_dquot_dirty(dquot[cnt]); | |
384 | if (!err) | |
385 | err = ret; | |
386 | } | |
387 | return err; | |
388 | } | |
389 | ||
390 | static inline void dqput_all(struct dquot **dquot) | |
391 | { | |
392 | unsigned int cnt; | |
393 | ||
394 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
395 | dqput(dquot[cnt]); | |
396 | } | |
397 | ||
1da177e4 LT |
398 | static inline int clear_dquot_dirty(struct dquot *dquot) |
399 | { | |
834057bf JK |
400 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
401 | return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); | |
402 | ||
1e0b7cb0 JK |
403 | spin_lock(&dq_list_lock); |
404 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { | |
405 | spin_unlock(&dq_list_lock); | |
1da177e4 | 406 | return 0; |
1e0b7cb0 | 407 | } |
1da177e4 | 408 | list_del_init(&dquot->dq_dirty); |
1e0b7cb0 | 409 | spin_unlock(&dq_list_lock); |
1da177e4 LT |
410 | return 1; |
411 | } | |
412 | ||
413 | void mark_info_dirty(struct super_block *sb, int type) | |
414 | { | |
15512377 JK |
415 | spin_lock(&dq_data_lock); |
416 | sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; | |
417 | spin_unlock(&dq_data_lock); | |
1da177e4 LT |
418 | } |
419 | EXPORT_SYMBOL(mark_info_dirty); | |
420 | ||
421 | /* | |
422 | * Read dquot from disk and alloc space for it | |
423 | */ | |
424 | ||
425 | int dquot_acquire(struct dquot *dquot) | |
426 | { | |
427 | int ret = 0, ret2 = 0; | |
428 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
429 | ||
d3be915f | 430 | mutex_lock(&dquot->dq_lock); |
3ef177ec | 431 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { |
4c376dca | 432 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
3ef177ec CX |
433 | if (ret < 0) |
434 | goto out_iolock; | |
435 | } | |
044c9b67 JK |
436 | /* Make sure flags update is visible after dquot has been filled */ |
437 | smp_mb__before_atomic(); | |
1da177e4 LT |
438 | set_bit(DQ_READ_B, &dquot->dq_flags); |
439 | /* Instantiate dquot if needed */ | |
440 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 441 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 442 | /* Write the info if needed */ |
4c376dca EB |
443 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
444 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
445 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 446 | } |
1da177e4 LT |
447 | if (ret < 0) |
448 | goto out_iolock; | |
449 | if (ret2 < 0) { | |
450 | ret = ret2; | |
451 | goto out_iolock; | |
452 | } | |
453 | } | |
044c9b67 JK |
454 | /* |
455 | * Make sure flags update is visible after on-disk struct has been | |
456 | * allocated. Paired with smp_rmb() in dqget(). | |
457 | */ | |
458 | smp_mb__before_atomic(); | |
1da177e4 LT |
459 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
460 | out_iolock: | |
d3be915f | 461 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
462 | return ret; |
463 | } | |
08d0350c | 464 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
465 | |
466 | /* | |
467 | * Write dquot to disk | |
468 | */ | |
469 | int dquot_commit(struct dquot *dquot) | |
470 | { | |
b03f2456 | 471 | int ret = 0; |
1da177e4 LT |
472 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
473 | ||
5e8cb9b6 | 474 | mutex_lock(&dquot->dq_lock); |
1e0b7cb0 | 475 | if (!clear_dquot_dirty(dquot)) |
5e8cb9b6 | 476 | goto out_lock; |
1da177e4 LT |
477 | /* Inactive dquot can be only if there was error during read/init |
478 | * => we have better not writing it */ | |
b03f2456 | 479 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 480 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
481 | else |
482 | ret = -EIO; | |
5e8cb9b6 JK |
483 | out_lock: |
484 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
485 | return ret; |
486 | } | |
08d0350c | 487 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
488 | |
489 | /* | |
490 | * Release dquot | |
491 | */ | |
492 | int dquot_release(struct dquot *dquot) | |
493 | { | |
494 | int ret = 0, ret2 = 0; | |
495 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
496 | ||
d3be915f | 497 | mutex_lock(&dquot->dq_lock); |
1da177e4 | 498 | /* Check whether we are not racing with some other dqget() */ |
df4bb5d1 | 499 | if (dquot_is_busy(dquot)) |
1da177e4 | 500 | goto out_dqlock; |
4c376dca EB |
501 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
502 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 503 | /* Write the info */ |
4c376dca EB |
504 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
505 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
506 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 507 | } |
1da177e4 LT |
508 | if (ret >= 0) |
509 | ret = ret2; | |
510 | } | |
511 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
1da177e4 | 512 | out_dqlock: |
d3be915f | 513 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
514 | return ret; |
515 | } | |
08d0350c | 516 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 517 | |
7d9056ba | 518 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
519 | { |
520 | kmem_cache_free(dquot_cachep, dquot); | |
521 | } | |
7d9056ba | 522 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
523 | |
524 | static inline void do_destroy_dquot(struct dquot *dquot) | |
525 | { | |
526 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
527 | } | |
528 | ||
1da177e4 LT |
529 | /* Invalidate all dquots on the list. Note that this function is called after |
530 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
531 | * quota users. There can still be some users of quotas due to inodes being |
532 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 533 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 534 | */ |
1da177e4 LT |
535 | static void invalidate_dquots(struct super_block *sb, int type) |
536 | { | |
c33ed271 | 537 | struct dquot *dquot, *tmp; |
1da177e4 | 538 | |
6362e4d4 | 539 | restart: |
1da177e4 | 540 | spin_lock(&dq_list_lock); |
c33ed271 | 541 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
542 | if (dquot->dq_sb != sb) |
543 | continue; | |
4c376dca | 544 | if (dquot->dq_id.type != type) |
1da177e4 | 545 | continue; |
6362e4d4 JK |
546 | /* Wait for dquot users */ |
547 | if (atomic_read(&dquot->dq_count)) { | |
9f985cb6 | 548 | dqgrab(dquot); |
6362e4d4 | 549 | spin_unlock(&dq_list_lock); |
503330f3 JK |
550 | /* |
551 | * Once dqput() wakes us up, we know it's time to free | |
6362e4d4 JK |
552 | * the dquot. |
553 | * IMPORTANT: we rely on the fact that there is always | |
554 | * at most one process waiting for dquot to free. | |
555 | * Otherwise dq_count would be > 1 and we would never | |
556 | * wake up. | |
557 | */ | |
503330f3 JK |
558 | wait_event(dquot_ref_wq, |
559 | atomic_read(&dquot->dq_count) == 1); | |
6362e4d4 JK |
560 | dqput(dquot); |
561 | /* At this moment dquot() need not exist (it could be | |
562 | * reclaimed by prune_dqcache(). Hence we must | |
563 | * restart. */ | |
564 | goto restart; | |
565 | } | |
566 | /* | |
567 | * Quota now has no users and it has been written on last | |
568 | * dqput() | |
569 | */ | |
1da177e4 LT |
570 | remove_dquot_hash(dquot); |
571 | remove_free_dquot(dquot); | |
572 | remove_inuse(dquot); | |
74f783af | 573 | do_destroy_dquot(dquot); |
1da177e4 LT |
574 | } |
575 | spin_unlock(&dq_list_lock); | |
576 | } | |
577 | ||
12c77527 JK |
578 | /* Call callback for every active dquot on given filesystem */ |
579 | int dquot_scan_active(struct super_block *sb, | |
580 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
581 | unsigned long priv) | |
582 | { | |
583 | struct dquot *dquot, *old_dquot = NULL; | |
584 | int ret = 0; | |
585 | ||
ee1ac541 JK |
586 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
587 | ||
12c77527 JK |
588 | spin_lock(&dq_list_lock); |
589 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
590 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
591 | continue; | |
592 | if (dquot->dq_sb != sb) | |
593 | continue; | |
594 | /* Now we have active dquot so we can just increase use count */ | |
595 | atomic_inc(&dquot->dq_count); | |
12c77527 JK |
596 | spin_unlock(&dq_list_lock); |
597 | dqput(old_dquot); | |
598 | old_dquot = dquot; | |
1362f4ea JK |
599 | /* |
600 | * ->release_dquot() can be racing with us. Our reference | |
601 | * protects us from new calls to it so just wait for any | |
602 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
603 | */ | |
604 | wait_on_dquot(dquot); | |
605 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
606 | ret = fn(dquot, priv); | |
607 | if (ret < 0) | |
608 | goto out; | |
609 | } | |
12c77527 JK |
610 | spin_lock(&dq_list_lock); |
611 | /* We are safe to continue now because our dquot could not | |
612 | * be moved out of the inuse list while we hold the reference */ | |
613 | } | |
614 | spin_unlock(&dq_list_lock); | |
615 | out: | |
616 | dqput(old_dquot); | |
12c77527 JK |
617 | return ret; |
618 | } | |
08d0350c | 619 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 620 | |
ceed1723 JK |
621 | /* Write all dquot structures to quota files */ |
622 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 | 623 | { |
6ff33d99 | 624 | struct list_head dirty; |
1da177e4 LT |
625 | struct dquot *dquot; |
626 | struct quota_info *dqopt = sb_dqopt(sb); | |
627 | int cnt; | |
ceed1723 | 628 | int err, ret = 0; |
1da177e4 | 629 | |
9d1ccbe7 JK |
630 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
631 | ||
1da177e4 LT |
632 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
633 | if (type != -1 && cnt != type) | |
634 | continue; | |
f55abc0f | 635 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
636 | continue; |
637 | spin_lock(&dq_list_lock); | |
6ff33d99 DM |
638 | /* Move list away to avoid livelock. */ |
639 | list_replace_init(&dqopt->info[cnt].dqi_dirty_list, &dirty); | |
640 | while (!list_empty(&dirty)) { | |
641 | dquot = list_first_entry(&dirty, struct dquot, | |
268157ba | 642 | dq_dirty); |
4580b30e JK |
643 | |
644 | WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); | |
645 | ||
1da177e4 LT |
646 | /* Now we have active dquot from which someone is |
647 | * holding reference so we can safely just increase | |
648 | * use count */ | |
9f985cb6 | 649 | dqgrab(dquot); |
1da177e4 | 650 | spin_unlock(&dq_list_lock); |
ceed1723 | 651 | err = sb->dq_op->write_dquot(dquot); |
dd5f6279 | 652 | if (err) { |
653 | /* | |
654 | * Clear dirty bit anyway to avoid infinite | |
655 | * loop here. | |
656 | */ | |
657 | clear_dquot_dirty(dquot); | |
658 | if (!ret) | |
659 | ret = err; | |
660 | } | |
1da177e4 LT |
661 | dqput(dquot); |
662 | spin_lock(&dq_list_lock); | |
663 | } | |
664 | spin_unlock(&dq_list_lock); | |
665 | } | |
666 | ||
667 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
668 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
669 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 670 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 671 | dqstats_inc(DQST_SYNCS); |
1da177e4 | 672 | |
ceed1723 JK |
673 | return ret; |
674 | } | |
675 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
676 | ||
677 | /* Write all dquot structures to disk and make them visible from userspace */ | |
678 | int dquot_quota_sync(struct super_block *sb, int type) | |
679 | { | |
680 | struct quota_info *dqopt = sb_dqopt(sb); | |
681 | int cnt; | |
682 | int ret; | |
683 | ||
684 | ret = dquot_writeback_dquots(sb, type); | |
685 | if (ret) | |
686 | return ret; | |
687 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
688 | return 0; |
689 | ||
690 | /* This is not very clever (and fast) but currently I don't know about | |
691 | * any other simple way of getting quota data to disk and we must get | |
692 | * them there for userspace to be visible... */ | |
693 | if (sb->s_op->sync_fs) | |
694 | sb->s_op->sync_fs(sb, 1); | |
695 | sync_blockdev(sb->s_bdev); | |
696 | ||
697 | /* | |
698 | * Now when everything is written we can discard the pagecache so | |
699 | * that userspace sees the changes. | |
700 | */ | |
5fb324ad CH |
701 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
702 | if (type != -1 && cnt != type) | |
703 | continue; | |
704 | if (!sb_has_quota_active(sb, cnt)) | |
705 | continue; | |
5955102c | 706 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 707 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 708 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 709 | } |
5fb324ad | 710 | |
1da177e4 LT |
711 | return 0; |
712 | } | |
287a8095 | 713 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 714 | |
1ab6c499 DC |
715 | static unsigned long |
716 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 717 | { |
1da177e4 | 718 | struct dquot *dquot; |
1ab6c499 | 719 | unsigned long freed = 0; |
1da177e4 | 720 | |
d68aab6b | 721 | spin_lock(&dq_list_lock); |
1822193b JK |
722 | while (!list_empty(&free_dquots) && sc->nr_to_scan) { |
723 | dquot = list_first_entry(&free_dquots, struct dquot, dq_free); | |
1da177e4 LT |
724 | remove_dquot_hash(dquot); |
725 | remove_free_dquot(dquot); | |
726 | remove_inuse(dquot); | |
74f783af | 727 | do_destroy_dquot(dquot); |
1ab6c499 DC |
728 | sc->nr_to_scan--; |
729 | freed++; | |
1da177e4 | 730 | } |
d68aab6b | 731 | spin_unlock(&dq_list_lock); |
1ab6c499 | 732 | return freed; |
1da177e4 LT |
733 | } |
734 | ||
1ab6c499 DC |
735 | static unsigned long |
736 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 737 | { |
55f841ce GC |
738 | return vfs_pressure_ratio( |
739 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
740 | } |
741 | ||
8e1f936b | 742 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
743 | .count_objects = dqcache_shrink_count, |
744 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
745 | .seeks = DEFAULT_SEEKS, |
746 | }; | |
747 | ||
1da177e4 LT |
748 | /* |
749 | * Put reference to dquot | |
1da177e4 | 750 | */ |
3d9ea253 | 751 | void dqput(struct dquot *dquot) |
1da177e4 | 752 | { |
b48d3805 JK |
753 | int ret; |
754 | ||
1da177e4 LT |
755 | if (!dquot) |
756 | return; | |
62af9b52 | 757 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 758 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 759 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
760 | quotatypes[dquot->dq_id.type], |
761 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
762 | BUG(); |
763 | } | |
764 | #endif | |
dde95888 | 765 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
766 | we_slept: |
767 | spin_lock(&dq_list_lock); | |
768 | if (atomic_read(&dquot->dq_count) > 1) { | |
769 | /* We have more than one user... nothing to do */ | |
770 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 771 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 772 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 | 773 | atomic_read(&dquot->dq_count) == 1) |
503330f3 | 774 | wake_up(&dquot_ref_wq); |
1da177e4 LT |
775 | spin_unlock(&dq_list_lock); |
776 | return; | |
777 | } | |
778 | /* Need to release dquot? */ | |
4580b30e | 779 | if (dquot_dirty(dquot)) { |
1da177e4 LT |
780 | spin_unlock(&dq_list_lock); |
781 | /* Commit dquot before releasing */ | |
b48d3805 JK |
782 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
783 | if (ret < 0) { | |
fb5ffb0e JZ |
784 | quota_error(dquot->dq_sb, "Can't write quota structure" |
785 | " (error %d). Quota may get out of sync!", | |
786 | ret); | |
b48d3805 JK |
787 | /* |
788 | * We clear dirty bit anyway, so that we avoid | |
789 | * infinite loop here | |
790 | */ | |
b48d3805 | 791 | clear_dquot_dirty(dquot); |
b48d3805 | 792 | } |
1da177e4 LT |
793 | goto we_slept; |
794 | } | |
1da177e4 LT |
795 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
796 | spin_unlock(&dq_list_lock); | |
797 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
798 | goto we_slept; | |
799 | } | |
800 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 801 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 802 | /* sanity check */ |
8abf6a47 | 803 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
804 | #endif |
805 | put_dquot_last(dquot); | |
806 | spin_unlock(&dq_list_lock); | |
807 | } | |
08d0350c | 808 | EXPORT_SYMBOL(dqput); |
1da177e4 | 809 | |
7d9056ba | 810 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
811 | { |
812 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
813 | } | |
7d9056ba | 814 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 815 | |
1da177e4 LT |
816 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
817 | { | |
818 | struct dquot *dquot; | |
819 | ||
74f783af | 820 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 821 | if(!dquot) |
dd6f3c6d | 822 | return NULL; |
1da177e4 | 823 | |
d3be915f | 824 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
825 | INIT_LIST_HEAD(&dquot->dq_free); |
826 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
827 | INIT_HLIST_NODE(&dquot->dq_hash); | |
828 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
829 | dquot->dq_sb = sb; | |
1a06d420 | 830 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 | 831 | atomic_set(&dquot->dq_count, 1); |
7b9ca4c6 | 832 | spin_lock_init(&dquot->dq_dqb_lock); |
1da177e4 LT |
833 | |
834 | return dquot; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Get reference to dquot | |
cc33412f JK |
839 | * |
840 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
841 | * destroying our dquot by: | |
842 | * a) checking for quota flags under dq_list_lock and | |
843 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 844 | */ |
aca645a6 | 845 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 846 | { |
1a06d420 | 847 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 848 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 849 | |
d49d3762 EB |
850 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
851 | return ERR_PTR(-EINVAL); | |
852 | ||
1a06d420 | 853 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 854 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
855 | we_slept: |
856 | spin_lock(&dq_list_lock); | |
cc33412f | 857 | spin_lock(&dq_state_lock); |
1a06d420 | 858 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
859 | spin_unlock(&dq_state_lock); |
860 | spin_unlock(&dq_list_lock); | |
6184fc0b | 861 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
862 | goto out; |
863 | } | |
864 | spin_unlock(&dq_state_lock); | |
865 | ||
1a06d420 | 866 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
867 | if (!dquot) { |
868 | if (!empty) { | |
1da177e4 | 869 | spin_unlock(&dq_list_lock); |
1a06d420 | 870 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 871 | if (!empty) |
1da177e4 LT |
872 | schedule(); /* Try to wait for a moment... */ |
873 | goto we_slept; | |
874 | } | |
875 | dquot = empty; | |
dd6f3c6d | 876 | empty = NULL; |
4c376dca | 877 | dquot->dq_id = qid; |
1da177e4 LT |
878 | /* all dquots go on the inuse_list */ |
879 | put_inuse(dquot); | |
880 | /* hash it first so it can be found */ | |
881 | insert_dquot_hash(dquot); | |
1da177e4 | 882 | spin_unlock(&dq_list_lock); |
dde95888 | 883 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
884 | } else { |
885 | if (!atomic_read(&dquot->dq_count)) | |
886 | remove_free_dquot(dquot); | |
887 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 888 | spin_unlock(&dq_list_lock); |
dde95888 DM |
889 | dqstats_inc(DQST_CACHE_HITS); |
890 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 891 | } |
268157ba JK |
892 | /* Wait for dq_lock - after this we know that either dquot_release() is |
893 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 894 | wait_on_dquot(dquot); |
268157ba | 895 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
896 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
897 | int err; | |
898 | ||
899 | err = sb->dq_op->acquire_dquot(dquot); | |
900 | if (err < 0) { | |
901 | dqput(dquot); | |
902 | dquot = ERR_PTR(err); | |
903 | goto out; | |
904 | } | |
1da177e4 | 905 | } |
044c9b67 JK |
906 | /* |
907 | * Make sure following reads see filled structure - paired with | |
908 | * smp_mb__before_atomic() in dquot_acquire(). | |
909 | */ | |
910 | smp_rmb(); | |
62af9b52 | 911 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 912 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 913 | #endif |
cc33412f JK |
914 | out: |
915 | if (empty) | |
916 | do_destroy_dquot(empty); | |
1da177e4 LT |
917 | |
918 | return dquot; | |
919 | } | |
08d0350c | 920 | EXPORT_SYMBOL(dqget); |
1da177e4 | 921 | |
2d0fa467 JK |
922 | static inline struct dquot **i_dquot(struct inode *inode) |
923 | { | |
2d0fa467 JK |
924 | return inode->i_sb->s_op->get_dquots(inode); |
925 | } | |
926 | ||
1da177e4 LT |
927 | static int dqinit_needed(struct inode *inode, int type) |
928 | { | |
5bcd3b6f | 929 | struct dquot * const *dquots; |
1da177e4 LT |
930 | int cnt; |
931 | ||
932 | if (IS_NOQUOTA(inode)) | |
933 | return 0; | |
5bcd3b6f KK |
934 | |
935 | dquots = i_dquot(inode); | |
1da177e4 | 936 | if (type != -1) |
5bcd3b6f | 937 | return !dquots[type]; |
1da177e4 | 938 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 939 | if (!dquots[cnt]) |
1da177e4 LT |
940 | return 1; |
941 | return 0; | |
942 | } | |
943 | ||
c3b00446 | 944 | /* This routine is guarded by s_umount semaphore */ |
1a6152d3 | 945 | static int add_dquot_ref(struct super_block *sb, int type) |
1da177e4 | 946 | { |
941d2380 | 947 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 948 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 949 | int reserved = 0; |
4c5e6c0e | 950 | #endif |
1a6152d3 | 951 | int err = 0; |
1da177e4 | 952 | |
74278da9 | 953 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 954 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
955 | spin_lock(&inode->i_lock); |
956 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
957 | !atomic_read(&inode->i_writecount) || | |
958 | !dqinit_needed(inode, type)) { | |
959 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 960 | continue; |
250df6ed | 961 | } |
d003fb70 | 962 | __iget(inode); |
250df6ed | 963 | spin_unlock(&inode->i_lock); |
74278da9 | 964 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 965 | |
d7e97117 JK |
966 | #ifdef CONFIG_QUOTA_DEBUG |
967 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
968 | reserved = 1; | |
969 | #endif | |
941d2380 | 970 | iput(old_inode); |
1a6152d3 CY |
971 | err = __dquot_initialize(inode, type); |
972 | if (err) { | |
973 | iput(inode); | |
974 | goto out; | |
975 | } | |
55fa6091 DC |
976 | |
977 | /* | |
978 | * We hold a reference to 'inode' so it couldn't have been | |
979 | * removed from s_inodes list while we dropped the | |
74278da9 | 980 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 981 | * holding the last reference and we cannot iput it under |
74278da9 | 982 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
983 | * later. |
984 | */ | |
941d2380 | 985 | old_inode = inode; |
04646aeb | 986 | cond_resched(); |
74278da9 | 987 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 988 | } |
74278da9 | 989 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 990 | iput(old_inode); |
1a6152d3 | 991 | out: |
62af9b52 | 992 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 993 | if (reserved) { |
fb5ffb0e JZ |
994 | quota_error(sb, "Writes happened before quota was turned on " |
995 | "thus quota information is probably inconsistent. " | |
996 | "Please run quotacheck(8)"); | |
0a5a9c72 | 997 | } |
4c5e6c0e | 998 | #endif |
1a6152d3 | 999 | return err; |
1da177e4 LT |
1000 | } |
1001 | ||
268157ba JK |
1002 | /* |
1003 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 1004 | * if we have the last reference to dquot |
268157ba | 1005 | */ |
9eb6463f NY |
1006 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
1007 | struct list_head *tofree_head) | |
1da177e4 | 1008 | { |
5bcd3b6f KK |
1009 | struct dquot **dquots = i_dquot(inode); |
1010 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 1011 | |
9eb6463f NY |
1012 | if (!dquot) |
1013 | return; | |
1014 | ||
5bcd3b6f | 1015 | dquots[type] = NULL; |
9eb6463f NY |
1016 | if (list_empty(&dquot->dq_free)) { |
1017 | /* | |
1018 | * The inode still has reference to dquot so it can't be in the | |
1019 | * free list | |
1020 | */ | |
1021 | spin_lock(&dq_list_lock); | |
1022 | list_add(&dquot->dq_free, tofree_head); | |
1023 | spin_unlock(&dq_list_lock); | |
1024 | } else { | |
1025 | /* | |
1026 | * Dquot is already in a list to put so we won't drop the last | |
1027 | * reference here. | |
1028 | */ | |
1029 | dqput(dquot); | |
1da177e4 | 1030 | } |
1da177e4 LT |
1031 | } |
1032 | ||
268157ba JK |
1033 | /* |
1034 | * Free list of dquots | |
1035 | * Dquots are removed from inodes and no new references can be got so we are | |
1036 | * the only ones holding reference | |
1037 | */ | |
1da177e4 LT |
1038 | static void put_dquot_list(struct list_head *tofree_head) |
1039 | { | |
1040 | struct list_head *act_head; | |
1041 | struct dquot *dquot; | |
1042 | ||
1043 | act_head = tofree_head->next; | |
1da177e4 LT |
1044 | while (act_head != tofree_head) { |
1045 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1046 | act_head = act_head->next; | |
268157ba JK |
1047 | /* Remove dquot from the list so we won't have problems... */ |
1048 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1049 | dqput(dquot); |
1050 | } | |
1051 | } | |
1052 | ||
fb58b731 CH |
1053 | static void remove_dquot_ref(struct super_block *sb, int type, |
1054 | struct list_head *tofree_head) | |
1055 | { | |
1056 | struct inode *inode; | |
78bc3334 | 1057 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 | 1058 | int reserved = 0; |
78bc3334 | 1059 | #endif |
fb58b731 | 1060 | |
74278da9 | 1061 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1062 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1063 | /* |
1064 | * We have to scan also I_NEW inodes because they can already | |
1065 | * have quota pointer initialized. Luckily, we need to touch | |
1066 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1067 | * (dq_data_lock). |
aabb8fdb | 1068 | */ |
b9ba6f94 | 1069 | spin_lock(&dq_data_lock); |
7af9cce8 | 1070 | if (!IS_NOQUOTA(inode)) { |
78bc3334 | 1071 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 DM |
1072 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
1073 | reserved = 1; | |
78bc3334 | 1074 | #endif |
fb58b731 | 1075 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1076 | } |
b9ba6f94 | 1077 | spin_unlock(&dq_data_lock); |
fb58b731 | 1078 | } |
74278da9 | 1079 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1080 | #ifdef CONFIG_QUOTA_DEBUG |
1081 | if (reserved) { | |
1082 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1083 | " was disabled thus quota information is probably " | |
1084 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1085 | } | |
1086 | #endif | |
fb58b731 CH |
1087 | } |
1088 | ||
1da177e4 LT |
1089 | /* Gather all references from inodes and drop them */ |
1090 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1091 | { | |
1092 | LIST_HEAD(tofree_head); | |
1093 | ||
fb58b731 | 1094 | if (sb->dq_op) { |
fb58b731 | 1095 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1096 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1097 | put_dquot_list(&tofree_head); |
1098 | } | |
1da177e4 LT |
1099 | } |
1100 | ||
740d9dcd MC |
1101 | static inline |
1102 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1103 | { | |
0a5a9c72 JK |
1104 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1105 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1106 | else { | |
1107 | WARN_ON_ONCE(1); | |
1108 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1109 | } | |
41e327b5 | 1110 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1111 | dquot->dq_dqb.dqb_bsoftlimit) | |
1112 | dquot->dq_dqb.dqb_btime = (time64_t) 0; | |
1113 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
740d9dcd MC |
1114 | } |
1115 | ||
7a2435d8 | 1116 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1117 | { |
db49d2df JK |
1118 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1119 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1120 | dquot->dq_dqb.dqb_curinodes -= number; |
1121 | else | |
1122 | dquot->dq_dqb.dqb_curinodes = 0; | |
1123 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1124 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1125 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1126 | } | |
1127 | ||
7a2435d8 | 1128 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1129 | { |
db49d2df JK |
1130 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1131 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1132 | dquot->dq_dqb.dqb_curspace -= number; |
1133 | else | |
1134 | dquot->dq_dqb.dqb_curspace = 0; | |
41e327b5 | 1135 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1136 | dquot->dq_dqb.dqb_bsoftlimit) | |
e008bb61 | 1137 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1138 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1139 | } | |
1140 | ||
bf097aaf JK |
1141 | struct dquot_warn { |
1142 | struct super_block *w_sb; | |
7b9c7321 | 1143 | struct kqid w_dq_id; |
bf097aaf JK |
1144 | short w_type; |
1145 | }; | |
1146 | ||
c525460e JK |
1147 | static int warning_issued(struct dquot *dquot, const int warntype) |
1148 | { | |
1149 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1150 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1151 | ((warntype == QUOTA_NL_IHARDWARN || | |
1152 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1153 | ||
1154 | if (!flag) | |
1155 | return 0; | |
1156 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1157 | } | |
1158 | ||
8e893469 | 1159 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1160 | static int flag_print_warnings = 1; |
1161 | ||
bf097aaf | 1162 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1163 | { |
1164 | if (!flag_print_warnings) | |
1165 | return 0; | |
1166 | ||
7b9c7321 | 1167 | switch (warn->w_dq_id.type) { |
1da177e4 | 1168 | case USRQUOTA: |
1a06d420 | 1169 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1170 | case GRPQUOTA: |
7b9c7321 | 1171 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1172 | case PRJQUOTA: |
1173 | return 1; | |
1da177e4 LT |
1174 | } |
1175 | return 0; | |
1176 | } | |
1177 | ||
1da177e4 | 1178 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1179 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1180 | { |
1181 | char *msg = NULL; | |
24ec839c | 1182 | struct tty_struct *tty; |
bf097aaf | 1183 | int warntype = warn->w_type; |
1da177e4 | 1184 | |
657d3bfa JK |
1185 | if (warntype == QUOTA_NL_IHARDBELOW || |
1186 | warntype == QUOTA_NL_ISOFTBELOW || | |
1187 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1188 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1189 | return; |
1190 | ||
24ec839c PZ |
1191 | tty = get_current_tty(); |
1192 | if (!tty) | |
452a00d2 | 1193 | return; |
bf097aaf | 1194 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1195 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1196 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1197 | else |
24ec839c | 1198 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1199 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1200 | switch (warntype) { |
8e893469 | 1201 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1202 | msg = " file limit reached.\r\n"; |
1203 | break; | |
8e893469 | 1204 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1205 | msg = " file quota exceeded too long.\r\n"; |
1206 | break; | |
8e893469 | 1207 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1208 | msg = " file quota exceeded.\r\n"; |
1209 | break; | |
8e893469 | 1210 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1211 | msg = " block limit reached.\r\n"; |
1212 | break; | |
8e893469 | 1213 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1214 | msg = " block quota exceeded too long.\r\n"; |
1215 | break; | |
8e893469 | 1216 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1217 | msg = " block quota exceeded.\r\n"; |
1218 | break; | |
1219 | } | |
24ec839c | 1220 | tty_write_message(tty, msg); |
452a00d2 | 1221 | tty_kref_put(tty); |
1da177e4 | 1222 | } |
8e893469 JK |
1223 | #endif |
1224 | ||
bf097aaf JK |
1225 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1226 | int warntype) | |
1227 | { | |
1228 | if (warning_issued(dquot, warntype)) | |
1229 | return; | |
1230 | warn->w_type = warntype; | |
1231 | warn->w_sb = dquot->dq_sb; | |
1232 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1233 | } |
1234 | ||
f18df228 MC |
1235 | /* |
1236 | * Write warnings to the console and send warning messages over netlink. | |
1237 | * | |
bf097aaf | 1238 | * Note that this function can call into tty and networking code. |
f18df228 | 1239 | */ |
bf097aaf | 1240 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1241 | { |
1242 | int i; | |
1243 | ||
86e931a3 | 1244 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1245 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1246 | continue; | |
8e893469 | 1247 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1248 | print_warning(&warn[i]); |
8e893469 | 1249 | #endif |
7b9c7321 | 1250 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1251 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1252 | } |
1da177e4 LT |
1253 | } |
1254 | ||
7a2435d8 | 1255 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1256 | { |
4c376dca | 1257 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1258 | |
1259 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1260 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1261 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1262 | } |
1263 | ||
7b9ca4c6 JK |
1264 | static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, |
1265 | struct dquot_warn *warn) | |
1da177e4 | 1266 | { |
7b9ca4c6 JK |
1267 | qsize_t newinodes; |
1268 | int ret = 0; | |
268157ba | 1269 | |
7b9ca4c6 JK |
1270 | spin_lock(&dquot->dq_dqb_lock); |
1271 | newinodes = dquot->dq_dqb.dqb_curinodes + inodes; | |
4c376dca | 1272 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1273 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
7b9ca4c6 | 1274 | goto add; |
1da177e4 LT |
1275 | |
1276 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1277 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1278 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1279 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
7b9ca4c6 JK |
1280 | ret = -EDQUOT; |
1281 | goto out; | |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1285 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1286 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1287 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1288 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1289 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
7b9ca4c6 JK |
1290 | ret = -EDQUOT; |
1291 | goto out; | |
1da177e4 LT |
1292 | } |
1293 | ||
1294 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1295 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1296 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1297 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1298 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1299 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 | 1300 | } |
7b9ca4c6 JK |
1301 | add: |
1302 | dquot->dq_dqb.dqb_curinodes = newinodes; | |
1da177e4 | 1303 | |
7b9ca4c6 JK |
1304 | out: |
1305 | spin_unlock(&dquot->dq_dqb_lock); | |
1306 | return ret; | |
1da177e4 LT |
1307 | } |
1308 | ||
7b9ca4c6 JK |
1309 | static int dquot_add_space(struct dquot *dquot, qsize_t space, |
1310 | qsize_t rsv_space, unsigned int flags, | |
1311 | struct dquot_warn *warn) | |
1da177e4 | 1312 | { |
f18df228 | 1313 | qsize_t tspace; |
268157ba | 1314 | struct super_block *sb = dquot->dq_sb; |
7b9ca4c6 | 1315 | int ret = 0; |
f18df228 | 1316 | |
7b9ca4c6 | 1317 | spin_lock(&dquot->dq_dqb_lock); |
4c376dca | 1318 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1319 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
ac3d7939 | 1320 | goto finish; |
1da177e4 | 1321 | |
f18df228 | 1322 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
7b9ca4c6 JK |
1323 | + space + rsv_space; |
1324 | ||
1da177e4 | 1325 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1326 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 | 1327 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1328 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1329 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
7b9ca4c6 | 1330 | ret = -EDQUOT; |
ac3d7939 | 1331 | goto finish; |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1335 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1336 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1337 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 | 1338 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1339 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1340 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
7b9ca4c6 | 1341 | ret = -EDQUOT; |
ac3d7939 | 1342 | goto finish; |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1346 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 | 1347 | dquot->dq_dqb.dqb_btime == 0) { |
7b9ca4c6 | 1348 | if (flags & DQUOT_SPACE_WARN) { |
bf097aaf | 1349 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1350 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1351 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
7b9ca4c6 | 1352 | } else { |
1da177e4 LT |
1353 | /* |
1354 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1355 | * be always printed | |
1356 | */ | |
7b9ca4c6 | 1357 | ret = -EDQUOT; |
ac3d7939 | 1358 | goto finish; |
7b9ca4c6 | 1359 | } |
1da177e4 | 1360 | } |
ac3d7939 JK |
1361 | finish: |
1362 | /* | |
1363 | * We have to be careful and go through warning generation & grace time | |
1364 | * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it | |
1365 | * only here... | |
1366 | */ | |
1367 | if (flags & DQUOT_SPACE_NOFAIL) | |
1368 | ret = 0; | |
1369 | if (!ret) { | |
1370 | dquot->dq_dqb.dqb_rsvspace += rsv_space; | |
1371 | dquot->dq_dqb.dqb_curspace += space; | |
1372 | } | |
7b9ca4c6 JK |
1373 | spin_unlock(&dquot->dq_dqb_lock); |
1374 | return ret; | |
1da177e4 LT |
1375 | } |
1376 | ||
12095460 | 1377 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1378 | { |
268157ba JK |
1379 | qsize_t newinodes; |
1380 | ||
657d3bfa | 1381 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1382 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1383 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1384 | return QUOTA_NL_NOWARN; |
1385 | ||
268157ba JK |
1386 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1387 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1388 | return QUOTA_NL_ISOFTBELOW; |
1389 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1390 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1391 | return QUOTA_NL_IHARDBELOW; |
1392 | return QUOTA_NL_NOWARN; | |
1393 | } | |
1394 | ||
1395 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1396 | { | |
41e327b5 | 1397 | qsize_t tspace; |
1398 | ||
1399 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; | |
1400 | ||
657d3bfa | 1401 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
41e327b5 | 1402 | tspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1403 | return QUOTA_NL_NOWARN; |
1404 | ||
41e327b5 | 1405 | if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1406 | return QUOTA_NL_BSOFTBELOW; |
41e327b5 | 1407 | if (tspace >= dquot->dq_dqb.dqb_bhardlimit && |
1408 | tspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1409 | return QUOTA_NL_BHARDBELOW; |
1410 | return QUOTA_NL_NOWARN; | |
1411 | } | |
0a5a9c72 | 1412 | |
189eef59 CH |
1413 | static int dquot_active(const struct inode *inode) |
1414 | { | |
1415 | struct super_block *sb = inode->i_sb; | |
1416 | ||
1417 | if (IS_NOQUOTA(inode)) | |
1418 | return 0; | |
1419 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1420 | } | |
1421 | ||
1da177e4 | 1422 | /* |
871a2931 CH |
1423 | * Initialize quota pointers in inode |
1424 | * | |
871a2931 CH |
1425 | * It is better to call this function outside of any transaction as it |
1426 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1427 | */ |
6184fc0b | 1428 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1429 | { |
1ea06bec | 1430 | int cnt, init_needed = 0; |
ab73ef46 | 1431 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1432 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1433 | qsize_t rsv; |
6184fc0b | 1434 | int ret = 0; |
1da177e4 | 1435 | |
189eef59 | 1436 | if (!dquot_active(inode)) |
6184fc0b | 1437 | return 0; |
cc33412f | 1438 | |
5bcd3b6f KK |
1439 | dquots = i_dquot(inode); |
1440 | ||
cc33412f JK |
1441 | /* First get references to structures we might need. */ |
1442 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1443 | struct kqid qid; |
847aac64 LX |
1444 | kprojid_t projid; |
1445 | int rc; | |
6184fc0b | 1446 | struct dquot *dquot; |
847aac64 | 1447 | |
cc33412f JK |
1448 | if (type != -1 && cnt != type) |
1449 | continue; | |
1ea06bec NY |
1450 | /* |
1451 | * The i_dquot should have been initialized in most cases, | |
1452 | * we check it without locking here to avoid unnecessary | |
1453 | * dqget()/dqput() calls. | |
1454 | */ | |
5bcd3b6f | 1455 | if (dquots[cnt]) |
1ea06bec | 1456 | continue; |
847aac64 LX |
1457 | |
1458 | if (!sb_has_quota_active(sb, cnt)) | |
1459 | continue; | |
1460 | ||
1ea06bec NY |
1461 | init_needed = 1; |
1462 | ||
cc33412f JK |
1463 | switch (cnt) { |
1464 | case USRQUOTA: | |
aca645a6 | 1465 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1466 | break; |
1467 | case GRPQUOTA: | |
aca645a6 | 1468 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1469 | break; |
847aac64 LX |
1470 | case PRJQUOTA: |
1471 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1472 | if (rc) | |
1473 | continue; | |
1474 | qid = make_kqid_projid(projid); | |
1475 | break; | |
cc33412f | 1476 | } |
6184fc0b JK |
1477 | dquot = dqget(sb, qid); |
1478 | if (IS_ERR(dquot)) { | |
1479 | /* We raced with somebody turning quotas off... */ | |
1480 | if (PTR_ERR(dquot) != -ESRCH) { | |
1481 | ret = PTR_ERR(dquot); | |
1482 | goto out_put; | |
1483 | } | |
1484 | dquot = NULL; | |
1485 | } | |
1486 | got[cnt] = dquot; | |
cc33412f JK |
1487 | } |
1488 | ||
1ea06bec NY |
1489 | /* All required i_dquot has been initialized */ |
1490 | if (!init_needed) | |
6184fc0b | 1491 | return 0; |
1ea06bec | 1492 | |
b9ba6f94 | 1493 | spin_lock(&dq_data_lock); |
1da177e4 | 1494 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1495 | goto out_lock; |
1da177e4 LT |
1496 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1497 | if (type != -1 && cnt != type) | |
1498 | continue; | |
cc33412f JK |
1499 | /* Avoid races with quotaoff() */ |
1500 | if (!sb_has_quota_active(sb, cnt)) | |
1501 | continue; | |
4408ea41 JK |
1502 | /* We could race with quotaon or dqget() could have failed */ |
1503 | if (!got[cnt]) | |
1504 | continue; | |
5bcd3b6f KK |
1505 | if (!dquots[cnt]) { |
1506 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1507 | got[cnt] = NULL; |
0a5a9c72 JK |
1508 | /* |
1509 | * Make quota reservation system happy if someone | |
1510 | * did a write before quota was turned on | |
1511 | */ | |
1512 | rsv = inode_get_rsv_space(inode); | |
7b9ca4c6 JK |
1513 | if (unlikely(rsv)) { |
1514 | spin_lock(&inode->i_lock); | |
1515 | /* Get reservation again under proper lock */ | |
1516 | rsv = __inode_get_rsv_space(inode); | |
1517 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1518 | dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; | |
1519 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1520 | spin_unlock(&inode->i_lock); | |
1521 | } | |
1da177e4 LT |
1522 | } |
1523 | } | |
6184fc0b | 1524 | out_lock: |
b9ba6f94 | 1525 | spin_unlock(&dq_data_lock); |
6184fc0b | 1526 | out_put: |
cc33412f | 1527 | /* Drop unused references */ |
dc52dd3a | 1528 | dqput_all(got); |
6184fc0b JK |
1529 | |
1530 | return ret; | |
871a2931 CH |
1531 | } |
1532 | ||
6184fc0b | 1533 | int dquot_initialize(struct inode *inode) |
871a2931 | 1534 | { |
6184fc0b | 1535 | return __dquot_initialize(inode, -1); |
1da177e4 | 1536 | } |
08d0350c | 1537 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1538 | |
b8cb5a54 TE |
1539 | bool dquot_initialize_needed(struct inode *inode) |
1540 | { | |
1541 | struct dquot **dquots; | |
1542 | int i; | |
1543 | ||
1544 | if (!dquot_active(inode)) | |
1545 | return false; | |
1546 | ||
1547 | dquots = i_dquot(inode); | |
1548 | for (i = 0; i < MAXQUOTAS; i++) | |
1549 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1550 | return true; | |
1551 | return false; | |
1552 | } | |
1553 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1554 | ||
1da177e4 | 1555 | /* |
b9ba6f94 NY |
1556 | * Release all quotas referenced by inode. |
1557 | * | |
1558 | * This function only be called on inode free or converting | |
1559 | * a file to quota file, no other users for the i_dquot in | |
1560 | * both cases, so we needn't call synchronize_srcu() after | |
1561 | * clearing i_dquot. | |
1da177e4 | 1562 | */ |
9f754758 | 1563 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1564 | { |
1565 | int cnt; | |
5bcd3b6f | 1566 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1567 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1568 | |
b9ba6f94 | 1569 | spin_lock(&dq_data_lock); |
1da177e4 | 1570 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1571 | put[cnt] = dquots[cnt]; |
1572 | dquots[cnt] = NULL; | |
1da177e4 | 1573 | } |
b9ba6f94 | 1574 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1575 | dqput_all(put); |
1da177e4 LT |
1576 | } |
1577 | ||
9f754758 CH |
1578 | void dquot_drop(struct inode *inode) |
1579 | { | |
5bcd3b6f | 1580 | struct dquot * const *dquots; |
9f754758 CH |
1581 | int cnt; |
1582 | ||
1583 | if (IS_NOQUOTA(inode)) | |
1584 | return; | |
1585 | ||
1586 | /* | |
1587 | * Test before calling to rule out calls from proc and such | |
1588 | * where we are not allowed to block. Note that this is | |
1589 | * actually reliable test even without the lock - the caller | |
1590 | * must assure that nobody can come after the DQUOT_DROP and | |
1591 | * add quota pointers back anyway. | |
1592 | */ | |
5bcd3b6f | 1593 | dquots = i_dquot(inode); |
9f754758 | 1594 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1595 | if (dquots[cnt]) |
9f754758 CH |
1596 | break; |
1597 | } | |
1598 | ||
1599 | if (cnt < MAXQUOTAS) | |
1600 | __dquot_drop(inode); | |
1601 | } | |
1602 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1603 | |
fd8fbfc1 DM |
1604 | /* |
1605 | * inode_reserved_space is managed internally by quota, and protected by | |
1606 | * i_lock similar to i_blocks+i_bytes. | |
1607 | */ | |
1608 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1609 | { | |
1610 | /* Filesystem must explicitly define it's own method in order to use | |
1611 | * quota reservation interface */ | |
1612 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1613 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1614 | } | |
1615 | ||
7b9ca4c6 | 1616 | static qsize_t __inode_get_rsv_space(struct inode *inode) |
fd8fbfc1 | 1617 | { |
7b9ca4c6 JK |
1618 | if (!inode->i_sb->dq_op->get_reserved_space) |
1619 | return 0; | |
1620 | return *inode_reserved_space(inode); | |
fd8fbfc1 DM |
1621 | } |
1622 | ||
1623 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1624 | { | |
1625 | qsize_t ret; | |
05b5d898 JK |
1626 | |
1627 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1628 | return 0; | |
fd8fbfc1 | 1629 | spin_lock(&inode->i_lock); |
7b9ca4c6 | 1630 | ret = __inode_get_rsv_space(inode); |
fd8fbfc1 DM |
1631 | spin_unlock(&inode->i_lock); |
1632 | return ret; | |
1633 | } | |
1634 | ||
1da177e4 | 1635 | /* |
5dd4056d CH |
1636 | * This functions updates i_blocks+i_bytes fields and quota information |
1637 | * (together with appropriate checks). | |
1638 | * | |
1639 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1640 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1641 | * the current transaction so that dquot write and inode write go into the | |
1642 | * same transaction. | |
1da177e4 LT |
1643 | */ |
1644 | ||
1645 | /* | |
1646 | * This operation can block, but only after everything is updated | |
1647 | */ | |
56246f9a | 1648 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1649 | { |
b9ba6f94 | 1650 | int cnt, ret = 0, index; |
bf097aaf | 1651 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1652 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1653 | struct dquot **dquots; |
1da177e4 | 1654 | |
189eef59 | 1655 | if (!dquot_active(inode)) { |
a478e522 JK |
1656 | if (reserve) { |
1657 | spin_lock(&inode->i_lock); | |
1658 | *inode_reserved_space(inode) += number; | |
1659 | spin_unlock(&inode->i_lock); | |
1660 | } else { | |
1661 | inode_add_bytes(inode, number); | |
1662 | } | |
fd8fbfc1 DM |
1663 | goto out; |
1664 | } | |
1665 | ||
1da177e4 | 1666 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1667 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1668 | |
5bcd3b6f | 1669 | dquots = i_dquot(inode); |
b9ba6f94 | 1670 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1671 | spin_lock(&inode->i_lock); |
1da177e4 | 1672 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1673 | if (!dquots[cnt]) |
1da177e4 | 1674 | continue; |
df15a2a5 | 1675 | if (reserve) { |
7b9ca4c6 JK |
1676 | ret = dquot_add_space(dquots[cnt], 0, number, flags, |
1677 | &warn[cnt]); | |
1678 | } else { | |
1679 | ret = dquot_add_space(dquots[cnt], number, 0, flags, | |
1680 | &warn[cnt]); | |
1681 | } | |
1682 | if (ret) { | |
1683 | /* Back out changes we already did */ | |
1684 | for (cnt--; cnt >= 0; cnt--) { | |
1685 | if (!dquots[cnt]) | |
1686 | continue; | |
1687 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a CX |
1688 | if (reserve) |
1689 | dquot_free_reserved_space(dquots[cnt], | |
1690 | number); | |
1691 | else | |
1692 | dquot_decr_space(dquots[cnt], number); | |
7b9ca4c6 JK |
1693 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1694 | } | |
1695 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 | 1696 | goto out_flush_warn; |
f18df228 | 1697 | } |
1da177e4 | 1698 | } |
7b9ca4c6 | 1699 | if (reserve) |
a478e522 | 1700 | *inode_reserved_space(inode) += number; |
7b9ca4c6 JK |
1701 | else |
1702 | __inode_add_bytes(inode, number); | |
1703 | spin_unlock(&inode->i_lock); | |
f18df228 | 1704 | |
fd8fbfc1 DM |
1705 | if (reserve) |
1706 | goto out_flush_warn; | |
bf097aaf | 1707 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1708 | out_flush_warn: |
b9ba6f94 | 1709 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1710 | flush_warnings(warn); |
f18df228 MC |
1711 | out: |
1712 | return ret; | |
1713 | } | |
5dd4056d | 1714 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1715 | |
1716 | /* | |
1717 | * This operation can block, but only after everything is updated | |
1718 | */ | |
6bab3596 | 1719 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1720 | { |
b9ba6f94 | 1721 | int cnt, ret = 0, index; |
bf097aaf | 1722 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1723 | struct dquot * const *dquots; |
1da177e4 | 1724 | |
189eef59 | 1725 | if (!dquot_active(inode)) |
63936dda | 1726 | return 0; |
1da177e4 | 1727 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1728 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1729 | |
5bcd3b6f | 1730 | dquots = i_dquot(inode); |
b9ba6f94 | 1731 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1732 | spin_lock(&inode->i_lock); |
1da177e4 | 1733 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1734 | if (!dquots[cnt]) |
1da177e4 | 1735 | continue; |
7b9ca4c6 JK |
1736 | ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); |
1737 | if (ret) { | |
1738 | for (cnt--; cnt >= 0; cnt--) { | |
1739 | if (!dquots[cnt]) | |
1740 | continue; | |
1741 | /* Back out changes we already did */ | |
1742 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a | 1743 | dquot_decr_inodes(dquots[cnt], 1); |
7b9ca4c6 JK |
1744 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1745 | } | |
1da177e4 | 1746 | goto warn_put_all; |
7b9ca4c6 | 1747 | } |
1da177e4 | 1748 | } |
efd8f0e6 | 1749 | |
1da177e4 | 1750 | warn_put_all: |
7b9ca4c6 | 1751 | spin_unlock(&inode->i_lock); |
63936dda | 1752 | if (ret == 0) |
bf097aaf | 1753 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1754 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1755 | flush_warnings(warn); |
1da177e4 LT |
1756 | return ret; |
1757 | } | |
08d0350c | 1758 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1759 | |
5dd4056d CH |
1760 | /* |
1761 | * Convert in-memory reserved quotas to real consumed quotas | |
1762 | */ | |
1763 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1764 | { |
5bcd3b6f | 1765 | struct dquot **dquots; |
b9ba6f94 | 1766 | int cnt, index; |
740d9dcd | 1767 | |
189eef59 | 1768 | if (!dquot_active(inode)) { |
0ed60de3 JK |
1769 | spin_lock(&inode->i_lock); |
1770 | *inode_reserved_space(inode) -= number; | |
1771 | __inode_add_bytes(inode, number); | |
1772 | spin_unlock(&inode->i_lock); | |
5dd4056d | 1773 | return 0; |
740d9dcd MC |
1774 | } |
1775 | ||
5bcd3b6f | 1776 | dquots = i_dquot(inode); |
b9ba6f94 | 1777 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1778 | spin_lock(&inode->i_lock); |
740d9dcd MC |
1779 | /* Claim reserved quotas to allocated quotas */ |
1780 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1781 | if (dquots[cnt]) { |
1782 | struct dquot *dquot = dquots[cnt]; | |
1783 | ||
7b9ca4c6 | 1784 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1785 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) |
1786 | number = dquot->dq_dqb.dqb_rsvspace; | |
1787 | dquot->dq_dqb.dqb_curspace += number; | |
1788 | dquot->dq_dqb.dqb_rsvspace -= number; | |
7b9ca4c6 | 1789 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1790 | } |
740d9dcd MC |
1791 | } |
1792 | /* Update inode bytes */ | |
0ed60de3 JK |
1793 | *inode_reserved_space(inode) -= number; |
1794 | __inode_add_bytes(inode, number); | |
1795 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1796 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1797 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1798 | return 0; |
740d9dcd | 1799 | } |
5dd4056d | 1800 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1801 | |
1c8924eb JK |
1802 | /* |
1803 | * Convert allocated space back to in-memory reserved quotas | |
1804 | */ | |
1805 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1806 | { | |
5bcd3b6f | 1807 | struct dquot **dquots; |
b9ba6f94 | 1808 | int cnt, index; |
1c8924eb JK |
1809 | |
1810 | if (!dquot_active(inode)) { | |
0ed60de3 JK |
1811 | spin_lock(&inode->i_lock); |
1812 | *inode_reserved_space(inode) += number; | |
1813 | __inode_sub_bytes(inode, number); | |
1814 | spin_unlock(&inode->i_lock); | |
1c8924eb JK |
1815 | return; |
1816 | } | |
1817 | ||
5bcd3b6f | 1818 | dquots = i_dquot(inode); |
b9ba6f94 | 1819 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1820 | spin_lock(&inode->i_lock); |
1c8924eb JK |
1821 | /* Claim reserved quotas to allocated quotas */ |
1822 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1823 | if (dquots[cnt]) { |
1824 | struct dquot *dquot = dquots[cnt]; | |
1825 | ||
7b9ca4c6 | 1826 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1827 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) |
1828 | number = dquot->dq_dqb.dqb_curspace; | |
1829 | dquot->dq_dqb.dqb_rsvspace += number; | |
1830 | dquot->dq_dqb.dqb_curspace -= number; | |
7b9ca4c6 | 1831 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1832 | } |
1c8924eb JK |
1833 | } |
1834 | /* Update inode bytes */ | |
0ed60de3 JK |
1835 | *inode_reserved_space(inode) += number; |
1836 | __inode_sub_bytes(inode, number); | |
1837 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1838 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1839 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1840 | return; |
1841 | } | |
1842 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1843 | ||
1da177e4 LT |
1844 | /* |
1845 | * This operation can block, but only after everything is updated | |
1846 | */ | |
56246f9a | 1847 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1848 | { |
1849 | unsigned int cnt; | |
bf097aaf | 1850 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1851 | struct dquot **dquots; |
b9ba6f94 | 1852 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1853 | |
189eef59 | 1854 | if (!dquot_active(inode)) { |
a478e522 JK |
1855 | if (reserve) { |
1856 | spin_lock(&inode->i_lock); | |
1857 | *inode_reserved_space(inode) -= number; | |
1858 | spin_unlock(&inode->i_lock); | |
1859 | } else { | |
1860 | inode_sub_bytes(inode, number); | |
1861 | } | |
5dd4056d | 1862 | return; |
1da177e4 | 1863 | } |
657d3bfa | 1864 | |
5bcd3b6f | 1865 | dquots = i_dquot(inode); |
b9ba6f94 | 1866 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1867 | spin_lock(&inode->i_lock); |
1da177e4 | 1868 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1869 | int wtype; |
1870 | ||
1871 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1872 | if (!dquots[cnt]) | |
1da177e4 | 1873 | continue; |
7b9ca4c6 | 1874 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1875 | wtype = info_bdq_free(dquots[cnt], number); |
1876 | if (wtype != QUOTA_NL_NOWARN) | |
1877 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1878 | if (reserve) |
bf097aaf | 1879 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1880 | else |
bf097aaf | 1881 | dquot_decr_space(dquots[cnt], number); |
7b9ca4c6 | 1882 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1883 | } |
7b9ca4c6 | 1884 | if (reserve) |
a478e522 | 1885 | *inode_reserved_space(inode) -= number; |
7b9ca4c6 JK |
1886 | else |
1887 | __inode_sub_bytes(inode, number); | |
1888 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 DM |
1889 | |
1890 | if (reserve) | |
1891 | goto out_unlock; | |
bf097aaf | 1892 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1893 | out_unlock: |
b9ba6f94 | 1894 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1895 | flush_warnings(warn); |
fd8fbfc1 | 1896 | } |
5dd4056d | 1897 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1898 | |
1da177e4 LT |
1899 | /* |
1900 | * This operation can block, but only after everything is updated | |
1901 | */ | |
6bab3596 | 1902 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1903 | { |
1904 | unsigned int cnt; | |
bf097aaf | 1905 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1906 | struct dquot * const *dquots; |
b9ba6f94 | 1907 | int index; |
1da177e4 | 1908 | |
189eef59 | 1909 | if (!dquot_active(inode)) |
63936dda | 1910 | return; |
657d3bfa | 1911 | |
5bcd3b6f | 1912 | dquots = i_dquot(inode); |
b9ba6f94 | 1913 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1914 | spin_lock(&inode->i_lock); |
1da177e4 | 1915 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1916 | int wtype; |
1917 | ||
1918 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1919 | if (!dquots[cnt]) | |
1da177e4 | 1920 | continue; |
7b9ca4c6 | 1921 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1922 | wtype = info_idq_free(dquots[cnt], 1); |
1923 | if (wtype != QUOTA_NL_NOWARN) | |
1924 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1925 | dquot_decr_inodes(dquots[cnt], 1); | |
7b9ca4c6 | 1926 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1927 | } |
7b9ca4c6 | 1928 | spin_unlock(&inode->i_lock); |
bf097aaf | 1929 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1930 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1931 | flush_warnings(warn); |
1da177e4 | 1932 | } |
08d0350c | 1933 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1934 | |
1935 | /* | |
1936 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1937 | * On success, dquot references in transfer_to are consumed and references |
1938 | * to original dquots that need to be released are placed there. On failure, | |
1939 | * references are kept untouched. | |
1da177e4 LT |
1940 | * |
1941 | * This operation can block, but only after everything is updated | |
1942 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1943 | * |
b9ba6f94 NY |
1944 | * We are holding reference on transfer_from & transfer_to, no need to |
1945 | * protect them by srcu_read_lock(). | |
1da177e4 | 1946 | */ |
bc8e5f07 | 1947 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1948 | { |
7b9ca4c6 | 1949 | qsize_t cur_space; |
740d9dcd | 1950 | qsize_t rsv_space = 0; |
7a9ca53a | 1951 | qsize_t inode_usage = 1; |
bc8e5f07 | 1952 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1953 | int cnt, ret = 0; |
9e32784b | 1954 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1955 | struct dquot_warn warn_to[MAXQUOTAS]; |
1956 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1957 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1958 | |
1da177e4 | 1959 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1960 | return 0; |
7a9ca53a TE |
1961 | |
1962 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1963 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1964 | if (ret) | |
1965 | return ret; | |
1966 | } | |
1967 | ||
cc33412f | 1968 | /* Initialize the arrays */ |
bf097aaf JK |
1969 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1970 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1971 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1972 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1973 | } | |
b9ba6f94 NY |
1974 | |
1975 | spin_lock(&dq_data_lock); | |
7b9ca4c6 | 1976 | spin_lock(&inode->i_lock); |
cc33412f | 1977 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
7b9ca4c6 | 1978 | spin_unlock(&inode->i_lock); |
b9ba6f94 | 1979 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1980 | return 0; |
cc33412f | 1981 | } |
7b9ca4c6 JK |
1982 | cur_space = __inode_get_bytes(inode); |
1983 | rsv_space = __inode_get_rsv_space(inode); | |
1984 | /* | |
1985 | * Build the transfer_from list, check limits, and update usage in | |
1986 | * the target structures. | |
1987 | */ | |
1da177e4 | 1988 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b D |
1989 | /* |
1990 | * Skip changes for same uid or gid or for turned off quota-type. | |
1991 | */ | |
dd6f3c6d | 1992 | if (!transfer_to[cnt]) |
1da177e4 | 1993 | continue; |
9e32784b D |
1994 | /* Avoid races with quotaoff() */ |
1995 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1996 | continue; | |
1997 | is_valid[cnt] = 1; | |
2d0fa467 | 1998 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7b9ca4c6 JK |
1999 | ret = dquot_add_inodes(transfer_to[cnt], inode_usage, |
2000 | &warn_to[cnt]); | |
efd8f0e6 CH |
2001 | if (ret) |
2002 | goto over_quota; | |
c6d9c35d | 2003 | ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, |
2004 | DQUOT_SPACE_WARN, &warn_to[cnt]); | |
7b9ca4c6 | 2005 | if (ret) { |
0a51fb71 | 2006 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); |
7b9ca4c6 | 2007 | dquot_decr_inodes(transfer_to[cnt], inode_usage); |
0a51fb71 | 2008 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); |
cc33412f | 2009 | goto over_quota; |
7b9ca4c6 | 2010 | } |
1da177e4 LT |
2011 | } |
2012 | ||
7b9ca4c6 | 2013 | /* Decrease usage for source structures and update quota pointers */ |
1da177e4 | 2014 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b | 2015 | if (!is_valid[cnt]) |
1da177e4 | 2016 | continue; |
1da177e4 LT |
2017 | /* Due to IO error we might not have transfer_from[] structure */ |
2018 | if (transfer_from[cnt]) { | |
bf097aaf | 2019 | int wtype; |
7b9ca4c6 JK |
2020 | |
2021 | spin_lock(&transfer_from[cnt]->dq_dqb_lock); | |
7a9ca53a | 2022 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
2023 | if (wtype != QUOTA_NL_NOWARN) |
2024 | prepare_warning(&warn_from_inodes[cnt], | |
2025 | transfer_from[cnt], wtype); | |
7b9ca4c6 JK |
2026 | wtype = info_bdq_free(transfer_from[cnt], |
2027 | cur_space + rsv_space); | |
bf097aaf JK |
2028 | if (wtype != QUOTA_NL_NOWARN) |
2029 | prepare_warning(&warn_from_space[cnt], | |
2030 | transfer_from[cnt], wtype); | |
7a9ca53a | 2031 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
2032 | dquot_decr_space(transfer_from[cnt], cur_space); |
2033 | dquot_free_reserved_space(transfer_from[cnt], | |
2034 | rsv_space); | |
7b9ca4c6 | 2035 | spin_unlock(&transfer_from[cnt]->dq_dqb_lock); |
1da177e4 | 2036 | } |
2d0fa467 | 2037 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 2038 | } |
7b9ca4c6 | 2039 | spin_unlock(&inode->i_lock); |
1da177e4 | 2040 | spin_unlock(&dq_data_lock); |
cc33412f | 2041 | |
dc52dd3a DM |
2042 | mark_all_dquot_dirty(transfer_from); |
2043 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
2044 | flush_warnings(warn_to); |
2045 | flush_warnings(warn_from_inodes); | |
2046 | flush_warnings(warn_from_space); | |
bc8e5f07 | 2047 | /* Pass back references to put */ |
dc52dd3a | 2048 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
2049 | if (is_valid[cnt]) |
2050 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 2051 | return 0; |
cc33412f | 2052 | over_quota: |
7b9ca4c6 JK |
2053 | /* Back out changes we already did */ |
2054 | for (cnt--; cnt >= 0; cnt--) { | |
2055 | if (!is_valid[cnt]) | |
2056 | continue; | |
2057 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); | |
2058 | dquot_decr_inodes(transfer_to[cnt], inode_usage); | |
2059 | dquot_decr_space(transfer_to[cnt], cur_space); | |
2060 | dquot_free_reserved_space(transfer_to[cnt], rsv_space); | |
2061 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); | |
2062 | } | |
2063 | spin_unlock(&inode->i_lock); | |
cc33412f | 2064 | spin_unlock(&dq_data_lock); |
bf097aaf | 2065 | flush_warnings(warn_to); |
86f3cbec | 2066 | return ret; |
1da177e4 | 2067 | } |
bc8e5f07 | 2068 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2069 | |
8ddd69d6 DM |
2070 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2071 | * Called from FSXXX_setattr() | |
2072 | */ | |
b43fa828 | 2073 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2074 | { |
bc8e5f07 | 2075 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2076 | struct dquot *dquot; |
bc8e5f07 JK |
2077 | struct super_block *sb = inode->i_sb; |
2078 | int ret; | |
8ddd69d6 | 2079 | |
189eef59 | 2080 | if (!dquot_active(inode)) |
bc8e5f07 | 2081 | return 0; |
12755627 | 2082 | |
6184fc0b JK |
2083 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2084 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2085 | if (IS_ERR(dquot)) { | |
2086 | if (PTR_ERR(dquot) != -ESRCH) { | |
2087 | ret = PTR_ERR(dquot); | |
2088 | goto out_put; | |
2089 | } | |
2090 | dquot = NULL; | |
2091 | } | |
2092 | transfer_to[USRQUOTA] = dquot; | |
2093 | } | |
2094 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2095 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2096 | if (IS_ERR(dquot)) { | |
2097 | if (PTR_ERR(dquot) != -ESRCH) { | |
2098 | ret = PTR_ERR(dquot); | |
2099 | goto out_put; | |
2100 | } | |
2101 | dquot = NULL; | |
2102 | } | |
2103 | transfer_to[GRPQUOTA] = dquot; | |
2104 | } | |
bc8e5f07 | 2105 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2106 | out_put: |
bc8e5f07 JK |
2107 | dqput_all(transfer_to); |
2108 | return ret; | |
b85f4b87 | 2109 | } |
b43fa828 | 2110 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2111 | |
1da177e4 LT |
2112 | /* |
2113 | * Write info of quota file to disk | |
2114 | */ | |
2115 | int dquot_commit_info(struct super_block *sb, int type) | |
2116 | { | |
1da177e4 LT |
2117 | struct quota_info *dqopt = sb_dqopt(sb); |
2118 | ||
9a8ae30e | 2119 | return dqopt->ops[type]->write_file_info(sb, type); |
1da177e4 | 2120 | } |
08d0350c | 2121 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2122 | |
be6257b2 JK |
2123 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2124 | { | |
2125 | struct quota_info *dqopt = sb_dqopt(sb); | |
be6257b2 | 2126 | |
9d1ccbe7 JK |
2127 | if (!sb_has_quota_active(sb, qid->type)) |
2128 | return -ESRCH; | |
2129 | if (!dqopt->ops[qid->type]->get_next_id) | |
2130 | return -ENOSYS; | |
f14618c6 | 2131 | return dqopt->ops[qid->type]->get_next_id(sb, qid); |
be6257b2 JK |
2132 | } |
2133 | EXPORT_SYMBOL(dquot_get_next_id); | |
2134 | ||
1da177e4 LT |
2135 | /* |
2136 | * Definitions of diskquota operations. | |
2137 | */ | |
61e225dc | 2138 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2139 | .write_dquot = dquot_commit, |
2140 | .acquire_dquot = dquot_acquire, | |
2141 | .release_dquot = dquot_release, | |
2142 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2143 | .write_info = dquot_commit_info, |
2144 | .alloc_dquot = dquot_alloc, | |
2145 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2146 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2147 | }; |
123e9caf | 2148 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2149 | |
907f4554 CH |
2150 | /* |
2151 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2152 | */ | |
2153 | int dquot_file_open(struct inode *inode, struct file *file) | |
2154 | { | |
2155 | int error; | |
2156 | ||
2157 | error = generic_file_open(inode, file); | |
2158 | if (!error && (file->f_mode & FMODE_WRITE)) | |
88d8ff97 | 2159 | error = dquot_initialize(inode); |
907f4554 CH |
2160 | return error; |
2161 | } | |
2162 | EXPORT_SYMBOL(dquot_file_open); | |
2163 | ||
2ec1f301 JK |
2164 | static void vfs_cleanup_quota_inode(struct super_block *sb, int type) |
2165 | { | |
2166 | struct quota_info *dqopt = sb_dqopt(sb); | |
2167 | struct inode *inode = dqopt->files[type]; | |
2168 | ||
2169 | if (!inode) | |
2170 | return; | |
2171 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2172 | inode_lock(inode); | |
2173 | inode->i_flags &= ~S_NOQUOTA; | |
2174 | inode_unlock(inode); | |
2175 | } | |
2176 | dqopt->files[type] = NULL; | |
2177 | iput(inode); | |
2178 | } | |
2179 | ||
1da177e4 LT |
2180 | /* |
2181 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2182 | */ | |
0f0dd62f | 2183 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2184 | { |
2ec1f301 | 2185 | int cnt; |
1da177e4 | 2186 | struct quota_info *dqopt = sb_dqopt(sb); |
1da177e4 | 2187 | |
7d6cd73d JK |
2188 | /* s_umount should be held in exclusive mode */ |
2189 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2190 | up_read(&sb->s_umount); | |
2191 | ||
f55abc0f JK |
2192 | /* Cannot turn off usage accounting without turning off limits, or |
2193 | * suspend quotas and simultaneously turn quotas off. */ | |
2194 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2195 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2196 | DQUOT_USAGE_ENABLED))) | |
2197 | return -EINVAL; | |
2198 | ||
9377abd0 JK |
2199 | /* |
2200 | * Skip everything if there's nothing to do. We have to do this because | |
2201 | * sometimes we are called when fill_super() failed and calling | |
2202 | * sync_fs() in such cases does no good. | |
2203 | */ | |
c3b00446 | 2204 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2205 | return 0; |
c3b00446 | 2206 | |
1da177e4 | 2207 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1da177e4 LT |
2208 | if (type != -1 && cnt != type) |
2209 | continue; | |
f55abc0f | 2210 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2211 | continue; |
f55abc0f JK |
2212 | |
2213 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2214 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2215 | dqopt->flags |= |
2216 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2217 | spin_unlock(&dq_state_lock); |
f55abc0f | 2218 | } else { |
cc33412f | 2219 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2220 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2221 | /* Turning off suspended quotas? */ | |
2222 | if (!sb_has_quota_loaded(sb, cnt) && | |
2223 | sb_has_quota_suspended(sb, cnt)) { | |
2224 | dqopt->flags &= ~dquot_state_flag( | |
2225 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2226 | spin_unlock(&dq_state_lock); |
2ec1f301 | 2227 | vfs_cleanup_quota_inode(sb, cnt); |
f55abc0f JK |
2228 | continue; |
2229 | } | |
cc33412f | 2230 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2231 | } |
f55abc0f JK |
2232 | |
2233 | /* We still have to keep quota loaded? */ | |
2234 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2235 | continue; |
1da177e4 LT |
2236 | |
2237 | /* Note: these are blocking operations */ | |
2238 | drop_dquot_ref(sb, cnt); | |
2239 | invalidate_dquots(sb, cnt); | |
2240 | /* | |
268157ba JK |
2241 | * Now all dquots should be invalidated, all writes done so we |
2242 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2243 | */ |
2244 | if (info_dirty(&dqopt->info[cnt])) | |
2245 | sb->dq_op->write_info(sb, cnt); | |
2246 | if (dqopt->ops[cnt]->free_file_info) | |
2247 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2248 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1da177e4 LT |
2249 | dqopt->info[cnt].dqi_flags = 0; |
2250 | dqopt->info[cnt].dqi_igrace = 0; | |
2251 | dqopt->info[cnt].dqi_bgrace = 0; | |
2252 | dqopt->ops[cnt] = NULL; | |
2253 | } | |
ca785ec6 JK |
2254 | |
2255 | /* Skip syncing and setting flags if quota files are hidden */ | |
2256 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2257 | goto put_inodes; | |
2258 | ||
1da177e4 | 2259 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2260 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2261 | if (sb->s_op->sync_fs) |
2262 | sb->s_op->sync_fs(sb, 1); | |
2263 | sync_blockdev(sb->s_bdev); | |
2264 | /* Now the quota files are just ordinary files and we can set the | |
2265 | * inode flags back. Moreover we discard the pagecache so that | |
2266 | * userspace sees the writes we did bypassing the pagecache. We | |
2267 | * must also discard the blockdev buffers so that we see the | |
2268 | * changes done by userspace on the next quotaon() */ | |
2269 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2ec1f301 JK |
2270 | if (!sb_has_quota_loaded(sb, cnt) && dqopt->files[cnt]) { |
2271 | inode_lock(dqopt->files[cnt]); | |
2272 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); | |
2273 | inode_unlock(dqopt->files[cnt]); | |
ca785ec6 JK |
2274 | } |
2275 | if (sb->s_bdev) | |
2276 | invalidate_bdev(sb->s_bdev); | |
2277 | put_inodes: | |
2ec1f301 JK |
2278 | /* We are done when suspending quotas */ |
2279 | if (flags & DQUOT_SUSPENDED) | |
2280 | return 0; | |
2281 | ||
ca785ec6 | 2282 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
2ec1f301 JK |
2283 | if (!sb_has_quota_loaded(sb, cnt)) |
2284 | vfs_cleanup_quota_inode(sb, cnt); | |
2285 | return 0; | |
1da177e4 | 2286 | } |
0f0dd62f | 2287 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2288 | |
287a8095 | 2289 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2290 | { |
0f0dd62f CH |
2291 | return dquot_disable(sb, type, |
2292 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2293 | } |
287a8095 | 2294 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2295 | |
1da177e4 LT |
2296 | /* |
2297 | * Turn quotas on on a device | |
2298 | */ | |
2299 | ||
c7d3d283 JK |
2300 | static int vfs_setup_quota_inode(struct inode *inode, int type) |
2301 | { | |
2302 | struct super_block *sb = inode->i_sb; | |
2303 | struct quota_info *dqopt = sb_dqopt(sb); | |
2304 | ||
2305 | if (!S_ISREG(inode->i_mode)) | |
2306 | return -EACCES; | |
2307 | if (IS_RDONLY(inode)) | |
2308 | return -EROFS; | |
2309 | if (sb_has_quota_loaded(sb, type)) | |
2310 | return -EBUSY; | |
2311 | ||
2312 | dqopt->files[type] = igrab(inode); | |
2313 | if (!dqopt->files[type]) | |
2314 | return -EIO; | |
2315 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2316 | /* We don't want quota and atime on quota files (deadlocks | |
2317 | * possible) Also nobody should write to the file - we use | |
2318 | * special IO operations which ignore the immutable bit. */ | |
2319 | inode_lock(inode); | |
2320 | inode->i_flags |= S_NOQUOTA; | |
2321 | inode_unlock(inode); | |
2322 | /* | |
2323 | * When S_NOQUOTA is set, remove dquot references as no more | |
2324 | * references can be added | |
2325 | */ | |
2326 | __dquot_drop(inode); | |
2327 | } | |
2328 | return 0; | |
2329 | } | |
2330 | ||
c7d3d283 | 2331 | int dquot_load_quota_sb(struct super_block *sb, int type, int format_id, |
f55abc0f | 2332 | unsigned int flags) |
1da177e4 LT |
2333 | { |
2334 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1da177e4 LT |
2335 | struct quota_info *dqopt = sb_dqopt(sb); |
2336 | int error; | |
1da177e4 | 2337 | |
dc19432a JK |
2338 | /* Just unsuspend quotas? */ |
2339 | BUG_ON(flags & DQUOT_SUSPENDED); | |
2340 | /* s_umount should be held in exclusive mode */ | |
2341 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2342 | up_read(&sb->s_umount); | |
2343 | ||
1da177e4 LT |
2344 | if (!fmt) |
2345 | return -ESRCH; | |
847aac64 LX |
2346 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2347 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2348 | error = -EINVAL; |
2349 | goto out_fmt; | |
2350 | } | |
5c004828 EB |
2351 | /* Filesystems outside of init_user_ns not yet supported */ |
2352 | if (sb->s_user_ns != &init_user_ns) { | |
2353 | error = -EINVAL; | |
2354 | goto out_fmt; | |
2355 | } | |
f55abc0f JK |
2356 | /* Usage always has to be set... */ |
2357 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2358 | error = -EINVAL; | |
2359 | goto out_fmt; | |
2360 | } | |
c3b00446 JK |
2361 | if (sb_has_quota_loaded(sb, type)) { |
2362 | error = -EBUSY; | |
2363 | goto out_fmt; | |
2364 | } | |
1da177e4 | 2365 | |
ca785ec6 | 2366 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2367 | /* As we bypass the pagecache we must now flush all the |
2368 | * dirty data and invalidate caches so that kernel sees | |
2369 | * changes from userspace. It is not enough to just flush | |
2370 | * the quota file since if blocksize < pagesize, invalidation | |
2371 | * of the cache could fail because of other unrelated dirty | |
2372 | * data */ | |
2373 | sync_filesystem(sb); | |
ca785ec6 JK |
2374 | invalidate_bdev(sb->s_bdev); |
2375 | } | |
ca785ec6 | 2376 | |
1da177e4 LT |
2377 | error = -EINVAL; |
2378 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
c7d3d283 | 2379 | goto out_fmt; |
1da177e4 LT |
2380 | |
2381 | dqopt->ops[type] = fmt->qf_ops; | |
2382 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2383 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2384 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
268157ba | 2385 | error = dqopt->ops[type]->read_file_info(sb, type); |
42fdb858 | 2386 | if (error < 0) |
c7d3d283 | 2387 | goto out_fmt; |
15512377 JK |
2388 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { |
2389 | spin_lock(&dq_data_lock); | |
46fe44ce | 2390 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; |
15512377 JK |
2391 | spin_unlock(&dq_data_lock); |
2392 | } | |
cc33412f | 2393 | spin_lock(&dq_state_lock); |
f55abc0f | 2394 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2395 | spin_unlock(&dq_state_lock); |
1da177e4 | 2396 | |
1a6152d3 CY |
2397 | error = add_dquot_ref(sb, type); |
2398 | if (error) | |
2399 | dquot_disable(sb, type, flags); | |
1da177e4 | 2400 | |
1a6152d3 | 2401 | return error; |
1da177e4 LT |
2402 | out_fmt: |
2403 | put_quota_format(fmt); | |
2404 | ||
27942ef5 | 2405 | return error; |
1da177e4 | 2406 | } |
c7d3d283 JK |
2407 | EXPORT_SYMBOL(dquot_load_quota_sb); |
2408 | ||
2409 | /* | |
dc19432a JK |
2410 | * More powerful function for turning on quotas on given quota inode allowing |
2411 | * setting of individual quota flags | |
c7d3d283 | 2412 | */ |
dc19432a | 2413 | int dquot_load_quota_inode(struct inode *inode, int type, int format_id, |
c7d3d283 JK |
2414 | unsigned int flags) |
2415 | { | |
2416 | int err; | |
2417 | ||
2418 | err = vfs_setup_quota_inode(inode, type); | |
2419 | if (err < 0) | |
2420 | return err; | |
2421 | err = dquot_load_quota_sb(inode->i_sb, type, format_id, flags); | |
2422 | if (err < 0) | |
2423 | vfs_cleanup_quota_inode(inode->i_sb, type); | |
2424 | return err; | |
2425 | } | |
dc19432a | 2426 | EXPORT_SYMBOL(dquot_load_quota_inode); |
1da177e4 | 2427 | |
0ff5af83 | 2428 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2429 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2430 | { |
2431 | struct quota_info *dqopt = sb_dqopt(sb); | |
0f0dd62f | 2432 | int ret = 0, cnt; |
f55abc0f | 2433 | unsigned int flags; |
0ff5af83 | 2434 | |
7d6cd73d JK |
2435 | /* s_umount should be held in exclusive mode */ |
2436 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2437 | up_read(&sb->s_umount); | |
2438 | ||
0f0dd62f CH |
2439 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2440 | if (type != -1 && cnt != type) | |
2441 | continue; | |
c3b00446 | 2442 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2443 | continue; |
c3b00446 | 2444 | |
0f0dd62f CH |
2445 | spin_lock(&dq_state_lock); |
2446 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2447 | DQUOT_LIMITS_ENABLED, | |
2448 | cnt); | |
2449 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2450 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2451 | |
0f0dd62f | 2452 | flags = dquot_generic_flag(flags, cnt); |
ae45f07d JK |
2453 | ret = dquot_load_quota_sb(sb, cnt, dqopt->info[cnt].dqi_fmt_id, |
2454 | flags); | |
2455 | if (ret < 0) | |
e51d68e7 | 2456 | vfs_cleanup_quota_inode(sb, cnt); |
0f0dd62f | 2457 | } |
0ff5af83 JK |
2458 | |
2459 | return ret; | |
2460 | } | |
0f0dd62f | 2461 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2462 | |
f00c9e44 | 2463 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2464 | const struct path *path) |
77e69dac AV |
2465 | { |
2466 | int error = security_quota_on(path->dentry); | |
2467 | if (error) | |
2468 | return error; | |
2469 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2470 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2471 | error = -EXDEV; |
2472 | else | |
dc19432a | 2473 | error = dquot_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2474 | format_id, DQUOT_USAGE_ENABLED | |
2475 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2476 | return error; |
2477 | } | |
287a8095 | 2478 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 LT |
2479 | |
2480 | /* | |
2481 | * This function is used when filesystem needs to initialize quotas | |
2482 | * during mount time. | |
2483 | */ | |
287a8095 | 2484 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2485 | int format_id, int type) |
1da177e4 | 2486 | { |
84de856e | 2487 | struct dentry *dentry; |
1da177e4 LT |
2488 | int error; |
2489 | ||
6c2d4798 | 2490 | dentry = lookup_positive_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2491 | if (IS_ERR(dentry)) |
2492 | return PTR_ERR(dentry); | |
2493 | ||
1da177e4 | 2494 | error = security_quota_on(dentry); |
84de856e | 2495 | if (!error) |
dc19432a | 2496 | error = dquot_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2497 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2498 | |
84de856e CH |
2499 | dput(dentry); |
2500 | return error; | |
1da177e4 | 2501 | } |
287a8095 | 2502 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2503 | |
3e2af67e JK |
2504 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2505 | { | |
2506 | int ret; | |
2507 | int type; | |
2508 | struct quota_info *dqopt = sb_dqopt(sb); | |
2509 | ||
2510 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2511 | return -ENOSYS; | |
2512 | /* Accounting cannot be turned on while fs is mounted */ | |
2513 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2514 | if (!flags) | |
2515 | return -EINVAL; | |
2516 | for (type = 0; type < MAXQUOTAS; type++) { | |
2517 | if (!(flags & qtype_enforce_flag(type))) | |
2518 | continue; | |
2519 | /* Can't enforce without accounting */ | |
069a9166 JK |
2520 | if (!sb_has_quota_usage_enabled(sb, type)) { |
2521 | ret = -EINVAL; | |
2522 | goto out_err; | |
2523 | } | |
2524 | if (sb_has_quota_limits_enabled(sb, type)) { | |
2525 | ret = -EBUSY; | |
3e2af67e | 2526 | goto out_err; |
069a9166 JK |
2527 | } |
2528 | spin_lock(&dq_state_lock); | |
2529 | dqopt->flags |= dquot_state_flag(DQUOT_LIMITS_ENABLED, type); | |
2530 | spin_unlock(&dq_state_lock); | |
3e2af67e JK |
2531 | } |
2532 | return 0; | |
2533 | out_err: | |
2534 | /* Backout enforcement enablement we already did */ | |
2535 | for (type--; type >= 0; type--) { | |
2536 | if (flags & qtype_enforce_flag(type)) | |
2537 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2538 | } | |
2539 | /* Error code translation for better compatibility with XFS */ | |
2540 | if (ret == -EBUSY) | |
2541 | ret = -EEXIST; | |
2542 | return ret; | |
2543 | } | |
2544 | ||
2545 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2546 | { | |
2547 | int ret; | |
2548 | int type; | |
2549 | struct quota_info *dqopt = sb_dqopt(sb); | |
2550 | ||
2551 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2552 | return -ENOSYS; | |
2553 | /* | |
2554 | * We don't support turning off accounting via quotactl. In principle | |
2555 | * quota infrastructure can do this but filesystems don't expect | |
2556 | * userspace to be able to do it. | |
2557 | */ | |
2558 | if (flags & | |
2559 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2560 | return -EOPNOTSUPP; | |
2561 | ||
2562 | /* Filter out limits not enabled */ | |
2563 | for (type = 0; type < MAXQUOTAS; type++) | |
2564 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2565 | flags &= ~qtype_enforce_flag(type); | |
2566 | /* Nothing left? */ | |
2567 | if (!flags) | |
2568 | return -EEXIST; | |
2569 | for (type = 0; type < MAXQUOTAS; type++) { | |
2570 | if (flags & qtype_enforce_flag(type)) { | |
2571 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2572 | if (ret < 0) | |
2573 | goto out_err; | |
2574 | } | |
2575 | } | |
2576 | return 0; | |
2577 | out_err: | |
2578 | /* Backout enforcement disabling we already did */ | |
2579 | for (type--; type >= 0; type--) { | |
069a9166 JK |
2580 | if (flags & qtype_enforce_flag(type)) { |
2581 | spin_lock(&dq_state_lock); | |
2582 | dqopt->flags |= | |
2583 | dquot_state_flag(DQUOT_LIMITS_ENABLED, type); | |
2584 | spin_unlock(&dq_state_lock); | |
2585 | } | |
3e2af67e JK |
2586 | } |
2587 | return ret; | |
2588 | } | |
2589 | ||
1da177e4 | 2590 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2591 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2592 | { |
2593 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2594 | ||
b9b2dd36 | 2595 | memset(di, 0, sizeof(*di)); |
7b9ca4c6 | 2596 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2597 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2598 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2599 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2600 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2601 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2602 | di->d_ino_count = dm->dqb_curinodes; | |
2603 | di->d_spc_timer = dm->dqb_btime; | |
2604 | di->d_ino_timer = dm->dqb_itime; | |
7b9ca4c6 | 2605 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 LT |
2606 | } |
2607 | ||
74a8a103 | 2608 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2609 | struct qc_dqblk *di) |
1da177e4 LT |
2610 | { |
2611 | struct dquot *dquot; | |
2612 | ||
aca645a6 | 2613 | dquot = dqget(sb, qid); |
6184fc0b JK |
2614 | if (IS_ERR(dquot)) |
2615 | return PTR_ERR(dquot); | |
1da177e4 LT |
2616 | do_get_dqblk(dquot, di); |
2617 | dqput(dquot); | |
cc33412f | 2618 | |
1da177e4 LT |
2619 | return 0; |
2620 | } | |
287a8095 | 2621 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2622 | |
be6257b2 JK |
2623 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2624 | struct qc_dqblk *di) | |
2625 | { | |
2626 | struct dquot *dquot; | |
2627 | int err; | |
2628 | ||
2629 | if (!sb->dq_op->get_next_id) | |
2630 | return -ENOSYS; | |
2631 | err = sb->dq_op->get_next_id(sb, qid); | |
2632 | if (err < 0) | |
2633 | return err; | |
2634 | dquot = dqget(sb, *qid); | |
2635 | if (IS_ERR(dquot)) | |
2636 | return PTR_ERR(dquot); | |
2637 | do_get_dqblk(dquot, di); | |
2638 | dqput(dquot); | |
2639 | ||
2640 | return 0; | |
2641 | } | |
2642 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2643 | ||
14bf61ff JK |
2644 | #define VFS_QC_MASK \ |
2645 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2646 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2647 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2648 | |
1da177e4 | 2649 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2650 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2651 | { |
2652 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2653 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2654 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2655 | |
14bf61ff | 2656 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2657 | return -EINVAL; |
2658 | ||
14bf61ff | 2659 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2660 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2661 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2662 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2663 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2664 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2665 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2666 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2667 | return -ERANGE; |
1da177e4 | 2668 | |
7b9ca4c6 | 2669 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2670 | if (di->d_fieldmask & QC_SPACE) { |
2671 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2672 | check_blim = 1; |
08261673 | 2673 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2674 | } |
c472b432 | 2675 | |
14bf61ff JK |
2676 | if (di->d_fieldmask & QC_SPC_SOFT) |
2677 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2678 | if (di->d_fieldmask & QC_SPC_HARD) | |
2679 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2680 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2681 | check_blim = 1; |
08261673 | 2682 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2683 | } |
c472b432 | 2684 | |
14bf61ff JK |
2685 | if (di->d_fieldmask & QC_INO_COUNT) { |
2686 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2687 | check_ilim = 1; |
08261673 | 2688 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2689 | } |
c472b432 | 2690 | |
14bf61ff | 2691 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2692 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2693 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2694 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2695 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2696 | check_ilim = 1; |
08261673 | 2697 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2698 | } |
c472b432 | 2699 | |
14bf61ff JK |
2700 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2701 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2702 | check_blim = 1; |
08261673 | 2703 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2704 | } |
c472b432 | 2705 | |
14bf61ff JK |
2706 | if (di->d_fieldmask & QC_INO_TIMER) { |
2707 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2708 | check_ilim = 1; |
08261673 | 2709 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2710 | } |
1da177e4 LT |
2711 | |
2712 | if (check_blim) { | |
268157ba | 2713 | if (!dm->dqb_bsoftlimit || |
4b8e1106 | 2714 | dm->dqb_curspace + dm->dqb_rsvspace <= dm->dqb_bsoftlimit) { |
1da177e4 LT |
2715 | dm->dqb_btime = 0; |
2716 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2717 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2718 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2719 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2720 | } |
2721 | if (check_ilim) { | |
268157ba | 2722 | if (!dm->dqb_isoftlimit || |
4b8e1106 | 2723 | dm->dqb_curinodes <= dm->dqb_isoftlimit) { |
1da177e4 LT |
2724 | dm->dqb_itime = 0; |
2725 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2726 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2727 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2728 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2729 | } |
268157ba JK |
2730 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2731 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2732 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2733 | else | |
2734 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
7b9ca4c6 | 2735 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 | 2736 | mark_dquot_dirty(dquot); |
338bf9af AP |
2737 | |
2738 | return 0; | |
1da177e4 LT |
2739 | } |
2740 | ||
74a8a103 | 2741 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2742 | struct qc_dqblk *di) |
1da177e4 LT |
2743 | { |
2744 | struct dquot *dquot; | |
338bf9af | 2745 | int rc; |
1da177e4 | 2746 | |
aca645a6 | 2747 | dquot = dqget(sb, qid); |
6184fc0b JK |
2748 | if (IS_ERR(dquot)) { |
2749 | rc = PTR_ERR(dquot); | |
f55abc0f | 2750 | goto out; |
1da177e4 | 2751 | } |
338bf9af | 2752 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2753 | dqput(dquot); |
f55abc0f | 2754 | out: |
338bf9af | 2755 | return rc; |
1da177e4 | 2756 | } |
287a8095 | 2757 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2758 | |
2759 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2760 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2761 | { |
2762 | struct mem_dqinfo *mi; | |
0a240339 JK |
2763 | struct qc_type_state *tstate; |
2764 | struct quota_info *dqopt = sb_dqopt(sb); | |
2765 | int type; | |
27942ef5 | 2766 | |
0a240339 JK |
2767 | memset(state, 0, sizeof(*state)); |
2768 | for (type = 0; type < MAXQUOTAS; type++) { | |
2769 | if (!sb_has_quota_active(sb, type)) | |
2770 | continue; | |
2771 | tstate = state->s_state + type; | |
2772 | mi = sb_dqopt(sb)->info + type; | |
2773 | tstate->flags = QCI_ACCT_ENABLED; | |
2774 | spin_lock(&dq_data_lock); | |
2775 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2776 | tstate->flags |= QCI_SYSFILE; | |
2777 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2778 | tstate->flags |= QCI_ROOT_SQUASH; | |
2779 | if (sb_has_quota_limits_enabled(sb, type)) | |
2780 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2781 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2782 | tstate->ino_timelimit = mi->dqi_igrace; | |
a0828b6c JK |
2783 | if (dqopt->files[type]) { |
2784 | tstate->ino = dqopt->files[type]->i_ino; | |
2785 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2786 | } | |
0a240339 JK |
2787 | tstate->nextents = 1; /* We don't know... */ |
2788 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2789 | } |
1da177e4 LT |
2790 | return 0; |
2791 | } | |
0a240339 | 2792 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2793 | |
2794 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2795 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2796 | { |
2797 | struct mem_dqinfo *mi; | |
f55abc0f | 2798 | int err = 0; |
1da177e4 | 2799 | |
5eacb2ac JK |
2800 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2801 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2802 | return -EINVAL; | |
9d1ccbe7 JK |
2803 | if (!sb_has_quota_active(sb, type)) |
2804 | return -ESRCH; | |
1da177e4 | 2805 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2806 | if (ii->i_fieldmask & QC_FLAGS) { |
2807 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2808 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2809 | return -EINVAL; | |
ca6cb091 | 2810 | } |
1da177e4 | 2811 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2812 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2813 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2814 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2815 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2816 | if (ii->i_fieldmask & QC_FLAGS) { | |
2817 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2818 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2819 | else | |
2820 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2821 | } | |
1da177e4 LT |
2822 | spin_unlock(&dq_data_lock); |
2823 | mark_info_dirty(sb, type); | |
2824 | /* Force write to disk */ | |
2825 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2826 | return err; |
1da177e4 | 2827 | } |
287a8095 | 2828 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2829 | |
3e2af67e JK |
2830 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2831 | .quota_enable = dquot_quota_enable, | |
2832 | .quota_disable = dquot_quota_disable, | |
2833 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2834 | .get_state = dquot_get_state, |
3e2af67e JK |
2835 | .set_info = dquot_set_dqinfo, |
2836 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2837 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2838 | .set_dqblk = dquot_set_dqblk |
2839 | }; | |
2840 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2841 | ||
dde95888 | 2842 | static int do_proc_dqstats(struct ctl_table *table, int write, |
32927393 | 2843 | void *buffer, size_t *lenp, loff_t *ppos) |
dde95888 | 2844 | { |
6fcbcec9 KK |
2845 | unsigned int type = (unsigned long *)table->data - dqstats.stat; |
2846 | s64 value = percpu_counter_sum(&dqstats.counter[type]); | |
2847 | ||
2848 | /* Filter negative values for non-monotonic counters */ | |
2849 | if (value < 0 && (type == DQST_ALLOC_DQUOTS || | |
2850 | type == DQST_FREE_DQUOTS)) | |
2851 | value = 0; | |
f32764bd DM |
2852 | |
2853 | /* Update global table */ | |
6fcbcec9 KK |
2854 | dqstats.stat[type] = value; |
2855 | return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); | |
dde95888 DM |
2856 | } |
2857 | ||
e628753b | 2858 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2859 | { |
1da177e4 | 2860 | .procname = "lookups", |
dde95888 | 2861 | .data = &dqstats.stat[DQST_LOOKUPS], |
6fcbcec9 | 2862 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2863 | .mode = 0444, |
dde95888 | 2864 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2865 | }, |
2866 | { | |
1da177e4 | 2867 | .procname = "drops", |
dde95888 | 2868 | .data = &dqstats.stat[DQST_DROPS], |
6fcbcec9 | 2869 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2870 | .mode = 0444, |
dde95888 | 2871 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2872 | }, |
2873 | { | |
1da177e4 | 2874 | .procname = "reads", |
dde95888 | 2875 | .data = &dqstats.stat[DQST_READS], |
6fcbcec9 | 2876 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2877 | .mode = 0444, |
dde95888 | 2878 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2879 | }, |
2880 | { | |
1da177e4 | 2881 | .procname = "writes", |
dde95888 | 2882 | .data = &dqstats.stat[DQST_WRITES], |
6fcbcec9 | 2883 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2884 | .mode = 0444, |
dde95888 | 2885 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2886 | }, |
2887 | { | |
1da177e4 | 2888 | .procname = "cache_hits", |
dde95888 | 2889 | .data = &dqstats.stat[DQST_CACHE_HITS], |
6fcbcec9 | 2890 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2891 | .mode = 0444, |
dde95888 | 2892 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2893 | }, |
2894 | { | |
1da177e4 | 2895 | .procname = "allocated_dquots", |
dde95888 | 2896 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
6fcbcec9 | 2897 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2898 | .mode = 0444, |
dde95888 | 2899 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2900 | }, |
2901 | { | |
1da177e4 | 2902 | .procname = "free_dquots", |
dde95888 | 2903 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
6fcbcec9 | 2904 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2905 | .mode = 0444, |
dde95888 | 2906 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2907 | }, |
2908 | { | |
1da177e4 | 2909 | .procname = "syncs", |
dde95888 | 2910 | .data = &dqstats.stat[DQST_SYNCS], |
6fcbcec9 | 2911 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2912 | .mode = 0444, |
dde95888 | 2913 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2914 | }, |
8e893469 | 2915 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2916 | { |
1da177e4 LT |
2917 | .procname = "warnings", |
2918 | .data = &flag_print_warnings, | |
2919 | .maxlen = sizeof(int), | |
2920 | .mode = 0644, | |
6d456111 | 2921 | .proc_handler = proc_dointvec, |
1da177e4 | 2922 | }, |
8e893469 | 2923 | #endif |
ab09203e | 2924 | { }, |
1da177e4 LT |
2925 | }; |
2926 | ||
e628753b | 2927 | static struct ctl_table fs_table[] = { |
1da177e4 | 2928 | { |
1da177e4 LT |
2929 | .procname = "quota", |
2930 | .mode = 0555, | |
2931 | .child = fs_dqstats_table, | |
2932 | }, | |
ab09203e | 2933 | { }, |
1da177e4 LT |
2934 | }; |
2935 | ||
e628753b | 2936 | static struct ctl_table sys_table[] = { |
1da177e4 | 2937 | { |
1da177e4 LT |
2938 | .procname = "fs", |
2939 | .mode = 0555, | |
2940 | .child = fs_table, | |
2941 | }, | |
ab09203e | 2942 | { }, |
1da177e4 LT |
2943 | }; |
2944 | ||
2945 | static int __init dquot_init(void) | |
2946 | { | |
f32764bd | 2947 | int i, ret; |
1da177e4 LT |
2948 | unsigned long nr_hash, order; |
2949 | ||
2950 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2951 | ||
0b4d4147 | 2952 | register_sysctl_table(sys_table); |
1da177e4 | 2953 | |
20c2df83 | 2954 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2955 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2956 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2957 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2958 | NULL); |
1da177e4 LT |
2959 | |
2960 | order = 0; | |
1aa3b3e0 | 2961 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); |
1da177e4 LT |
2962 | if (!dquot_hash) |
2963 | panic("Cannot create dquot hash table"); | |
2964 | ||
f32764bd | 2965 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2966 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2967 | if (ret) |
2968 | panic("Cannot create dquot stat counters"); | |
2969 | } | |
dde95888 | 2970 | |
1da177e4 LT |
2971 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2972 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
24fc755f | 2973 | dq_hash_bits = ilog2(nr_hash); |
1da177e4 LT |
2974 | |
2975 | nr_hash = 1UL << dq_hash_bits; | |
2976 | dq_hash_mask = nr_hash - 1; | |
2977 | for (i = 0; i < nr_hash; i++) | |
2978 | INIT_HLIST_HEAD(dquot_hash + i); | |
2979 | ||
19858e7b AB |
2980 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2981 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2982 | |
88bc0ede TH |
2983 | if (register_shrinker(&dqcache_shrinker)) |
2984 | panic("Cannot register dquot shrinker"); | |
1da177e4 LT |
2985 | |
2986 | return 0; | |
2987 | } | |
331221fa | 2988 | fs_initcall(dquot_init); |