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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 LT |
290 | { |
291 | struct hlist_node *node; | |
292 | struct dquot *dquot; | |
293 | ||
294 | hlist_for_each (node, dquot_hash+hashent) { | |
295 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
4c376dca | 296 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 LT |
297 | return dquot; |
298 | } | |
dd6f3c6d | 299 | return NULL; |
1da177e4 LT |
300 | } |
301 | ||
302 | /* Add a dquot to the tail of the free list */ | |
303 | static inline void put_dquot_last(struct dquot *dquot) | |
304 | { | |
8e13059a | 305 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 306 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
307 | } |
308 | ||
309 | static inline void remove_free_dquot(struct dquot *dquot) | |
310 | { | |
311 | if (list_empty(&dquot->dq_free)) | |
312 | return; | |
313 | list_del_init(&dquot->dq_free); | |
dde95888 | 314 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
315 | } |
316 | ||
317 | static inline void put_inuse(struct dquot *dquot) | |
318 | { | |
319 | /* We add to the back of inuse list so we don't have to restart | |
320 | * when traversing this list and we block */ | |
8e13059a | 321 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 322 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
323 | } |
324 | ||
325 | static inline void remove_inuse(struct dquot *dquot) | |
326 | { | |
dde95888 | 327 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
328 | list_del(&dquot->dq_inuse); |
329 | } | |
330 | /* | |
331 | * End of list functions needing dq_list_lock | |
332 | */ | |
333 | ||
334 | static void wait_on_dquot(struct dquot *dquot) | |
335 | { | |
d3be915f IM |
336 | mutex_lock(&dquot->dq_lock); |
337 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
338 | } |
339 | ||
03f6e92b JK |
340 | static inline int dquot_dirty(struct dquot *dquot) |
341 | { | |
342 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
343 | } | |
344 | ||
345 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
346 | { | |
347 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
348 | } | |
1da177e4 | 349 | |
eabf290d | 350 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
351 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
352 | { | |
eabf290d DM |
353 | int ret = 1; |
354 | ||
4580b30e JK |
355 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
356 | return 0; | |
357 | ||
834057bf JK |
358 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
359 | return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); | |
360 | ||
eabf290d DM |
361 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ |
362 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
363 | return 1; | |
364 | ||
1da177e4 | 365 | spin_lock(&dq_list_lock); |
eabf290d | 366 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 367 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 368 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
369 | ret = 0; |
370 | } | |
1da177e4 | 371 | spin_unlock(&dq_list_lock); |
eabf290d | 372 | return ret; |
1da177e4 | 373 | } |
08d0350c | 374 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 375 | |
dc52dd3a DM |
376 | /* Dirtify all the dquots - this can block when journalling */ |
377 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
378 | { | |
379 | int ret, err, cnt; | |
380 | ||
381 | ret = err = 0; | |
382 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
383 | if (dquot[cnt]) | |
384 | /* Even in case of error we have to continue */ | |
385 | ret = mark_dquot_dirty(dquot[cnt]); | |
386 | if (!err) | |
387 | err = ret; | |
388 | } | |
389 | return err; | |
390 | } | |
391 | ||
392 | static inline void dqput_all(struct dquot **dquot) | |
393 | { | |
394 | unsigned int cnt; | |
395 | ||
396 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
397 | dqput(dquot[cnt]); | |
398 | } | |
399 | ||
1da177e4 LT |
400 | static inline int clear_dquot_dirty(struct dquot *dquot) |
401 | { | |
834057bf JK |
402 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
403 | return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); | |
404 | ||
1e0b7cb0 JK |
405 | spin_lock(&dq_list_lock); |
406 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { | |
407 | spin_unlock(&dq_list_lock); | |
1da177e4 | 408 | return 0; |
1e0b7cb0 | 409 | } |
1da177e4 | 410 | list_del_init(&dquot->dq_dirty); |
1e0b7cb0 | 411 | spin_unlock(&dq_list_lock); |
1da177e4 LT |
412 | return 1; |
413 | } | |
414 | ||
415 | void mark_info_dirty(struct super_block *sb, int type) | |
416 | { | |
15512377 JK |
417 | spin_lock(&dq_data_lock); |
418 | sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; | |
419 | spin_unlock(&dq_data_lock); | |
1da177e4 LT |
420 | } |
421 | EXPORT_SYMBOL(mark_info_dirty); | |
422 | ||
423 | /* | |
424 | * Read dquot from disk and alloc space for it | |
425 | */ | |
426 | ||
427 | int dquot_acquire(struct dquot *dquot) | |
428 | { | |
429 | int ret = 0, ret2 = 0; | |
430 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
431 | ||
d3be915f | 432 | mutex_lock(&dquot->dq_lock); |
3ef177ec | 433 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { |
4c376dca | 434 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
3ef177ec CX |
435 | if (ret < 0) |
436 | goto out_iolock; | |
437 | } | |
044c9b67 JK |
438 | /* Make sure flags update is visible after dquot has been filled */ |
439 | smp_mb__before_atomic(); | |
1da177e4 LT |
440 | set_bit(DQ_READ_B, &dquot->dq_flags); |
441 | /* Instantiate dquot if needed */ | |
442 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 443 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 444 | /* Write the info if needed */ |
4c376dca EB |
445 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
446 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
447 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 448 | } |
1da177e4 LT |
449 | if (ret < 0) |
450 | goto out_iolock; | |
451 | if (ret2 < 0) { | |
452 | ret = ret2; | |
453 | goto out_iolock; | |
454 | } | |
455 | } | |
044c9b67 JK |
456 | /* |
457 | * Make sure flags update is visible after on-disk struct has been | |
458 | * allocated. Paired with smp_rmb() in dqget(). | |
459 | */ | |
460 | smp_mb__before_atomic(); | |
1da177e4 LT |
461 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
462 | out_iolock: | |
d3be915f | 463 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
464 | return ret; |
465 | } | |
08d0350c | 466 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
467 | |
468 | /* | |
469 | * Write dquot to disk | |
470 | */ | |
471 | int dquot_commit(struct dquot *dquot) | |
472 | { | |
b03f2456 | 473 | int ret = 0; |
1da177e4 LT |
474 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
475 | ||
5e8cb9b6 | 476 | mutex_lock(&dquot->dq_lock); |
1e0b7cb0 | 477 | if (!clear_dquot_dirty(dquot)) |
5e8cb9b6 | 478 | goto out_lock; |
1da177e4 LT |
479 | /* Inactive dquot can be only if there was error during read/init |
480 | * => we have better not writing it */ | |
b03f2456 | 481 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 482 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
483 | else |
484 | ret = -EIO; | |
5e8cb9b6 JK |
485 | out_lock: |
486 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
487 | return ret; |
488 | } | |
08d0350c | 489 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
490 | |
491 | /* | |
492 | * Release dquot | |
493 | */ | |
494 | int dquot_release(struct dquot *dquot) | |
495 | { | |
496 | int ret = 0, ret2 = 0; | |
497 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
498 | ||
d3be915f | 499 | mutex_lock(&dquot->dq_lock); |
1da177e4 | 500 | /* Check whether we are not racing with some other dqget() */ |
df4bb5d1 | 501 | if (dquot_is_busy(dquot)) |
1da177e4 | 502 | goto out_dqlock; |
4c376dca EB |
503 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
504 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 505 | /* Write the info */ |
4c376dca EB |
506 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
507 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
508 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 509 | } |
1da177e4 LT |
510 | if (ret >= 0) |
511 | ret = ret2; | |
512 | } | |
513 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
1da177e4 | 514 | out_dqlock: |
d3be915f | 515 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
516 | return ret; |
517 | } | |
08d0350c | 518 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 519 | |
7d9056ba | 520 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
521 | { |
522 | kmem_cache_free(dquot_cachep, dquot); | |
523 | } | |
7d9056ba | 524 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
525 | |
526 | static inline void do_destroy_dquot(struct dquot *dquot) | |
527 | { | |
528 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
529 | } | |
530 | ||
1da177e4 LT |
531 | /* Invalidate all dquots on the list. Note that this function is called after |
532 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
533 | * quota users. There can still be some users of quotas due to inodes being |
534 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 535 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 536 | */ |
1da177e4 LT |
537 | static void invalidate_dquots(struct super_block *sb, int type) |
538 | { | |
c33ed271 | 539 | struct dquot *dquot, *tmp; |
1da177e4 | 540 | |
6362e4d4 | 541 | restart: |
1da177e4 | 542 | spin_lock(&dq_list_lock); |
c33ed271 | 543 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
544 | if (dquot->dq_sb != sb) |
545 | continue; | |
4c376dca | 546 | if (dquot->dq_id.type != type) |
1da177e4 | 547 | continue; |
6362e4d4 JK |
548 | /* Wait for dquot users */ |
549 | if (atomic_read(&dquot->dq_count)) { | |
9f985cb6 | 550 | dqgrab(dquot); |
6362e4d4 | 551 | spin_unlock(&dq_list_lock); |
503330f3 JK |
552 | /* |
553 | * Once dqput() wakes us up, we know it's time to free | |
6362e4d4 JK |
554 | * the dquot. |
555 | * IMPORTANT: we rely on the fact that there is always | |
556 | * at most one process waiting for dquot to free. | |
557 | * Otherwise dq_count would be > 1 and we would never | |
558 | * wake up. | |
559 | */ | |
503330f3 JK |
560 | wait_event(dquot_ref_wq, |
561 | atomic_read(&dquot->dq_count) == 1); | |
6362e4d4 JK |
562 | dqput(dquot); |
563 | /* At this moment dquot() need not exist (it could be | |
564 | * reclaimed by prune_dqcache(). Hence we must | |
565 | * restart. */ | |
566 | goto restart; | |
567 | } | |
568 | /* | |
569 | * Quota now has no users and it has been written on last | |
570 | * dqput() | |
571 | */ | |
1da177e4 LT |
572 | remove_dquot_hash(dquot); |
573 | remove_free_dquot(dquot); | |
574 | remove_inuse(dquot); | |
74f783af | 575 | do_destroy_dquot(dquot); |
1da177e4 LT |
576 | } |
577 | spin_unlock(&dq_list_lock); | |
578 | } | |
579 | ||
12c77527 JK |
580 | /* Call callback for every active dquot on given filesystem */ |
581 | int dquot_scan_active(struct super_block *sb, | |
582 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
583 | unsigned long priv) | |
584 | { | |
585 | struct dquot *dquot, *old_dquot = NULL; | |
586 | int ret = 0; | |
587 | ||
ee1ac541 JK |
588 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
589 | ||
12c77527 JK |
590 | spin_lock(&dq_list_lock); |
591 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
592 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
593 | continue; | |
594 | if (dquot->dq_sb != sb) | |
595 | continue; | |
596 | /* Now we have active dquot so we can just increase use count */ | |
597 | atomic_inc(&dquot->dq_count); | |
12c77527 JK |
598 | spin_unlock(&dq_list_lock); |
599 | dqput(old_dquot); | |
600 | old_dquot = dquot; | |
1362f4ea JK |
601 | /* |
602 | * ->release_dquot() can be racing with us. Our reference | |
603 | * protects us from new calls to it so just wait for any | |
604 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
605 | */ | |
606 | wait_on_dquot(dquot); | |
607 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
608 | ret = fn(dquot, priv); | |
609 | if (ret < 0) | |
610 | goto out; | |
611 | } | |
12c77527 JK |
612 | spin_lock(&dq_list_lock); |
613 | /* We are safe to continue now because our dquot could not | |
614 | * be moved out of the inuse list while we hold the reference */ | |
615 | } | |
616 | spin_unlock(&dq_list_lock); | |
617 | out: | |
618 | dqput(old_dquot); | |
12c77527 JK |
619 | return ret; |
620 | } | |
08d0350c | 621 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 622 | |
ceed1723 JK |
623 | /* Write all dquot structures to quota files */ |
624 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 | 625 | { |
6ff33d99 | 626 | struct list_head dirty; |
1da177e4 LT |
627 | struct dquot *dquot; |
628 | struct quota_info *dqopt = sb_dqopt(sb); | |
629 | int cnt; | |
ceed1723 | 630 | int err, ret = 0; |
1da177e4 | 631 | |
9d1ccbe7 JK |
632 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
633 | ||
1da177e4 LT |
634 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
635 | if (type != -1 && cnt != type) | |
636 | continue; | |
f55abc0f | 637 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
638 | continue; |
639 | spin_lock(&dq_list_lock); | |
6ff33d99 DM |
640 | /* Move list away to avoid livelock. */ |
641 | list_replace_init(&dqopt->info[cnt].dqi_dirty_list, &dirty); | |
642 | while (!list_empty(&dirty)) { | |
643 | dquot = list_first_entry(&dirty, struct dquot, | |
268157ba | 644 | dq_dirty); |
4580b30e JK |
645 | |
646 | WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); | |
647 | ||
1da177e4 LT |
648 | /* Now we have active dquot from which someone is |
649 | * holding reference so we can safely just increase | |
650 | * use count */ | |
9f985cb6 | 651 | dqgrab(dquot); |
1da177e4 | 652 | spin_unlock(&dq_list_lock); |
ceed1723 | 653 | err = sb->dq_op->write_dquot(dquot); |
dd5f6279 | 654 | if (err) { |
655 | /* | |
656 | * Clear dirty bit anyway to avoid infinite | |
657 | * loop here. | |
658 | */ | |
659 | clear_dquot_dirty(dquot); | |
660 | if (!ret) | |
661 | ret = err; | |
662 | } | |
1da177e4 LT |
663 | dqput(dquot); |
664 | spin_lock(&dq_list_lock); | |
665 | } | |
666 | spin_unlock(&dq_list_lock); | |
667 | } | |
668 | ||
669 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
670 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
671 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 672 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 673 | dqstats_inc(DQST_SYNCS); |
1da177e4 | 674 | |
ceed1723 JK |
675 | return ret; |
676 | } | |
677 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
678 | ||
679 | /* Write all dquot structures to disk and make them visible from userspace */ | |
680 | int dquot_quota_sync(struct super_block *sb, int type) | |
681 | { | |
682 | struct quota_info *dqopt = sb_dqopt(sb); | |
683 | int cnt; | |
684 | int ret; | |
685 | ||
686 | ret = dquot_writeback_dquots(sb, type); | |
687 | if (ret) | |
688 | return ret; | |
689 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
690 | return 0; |
691 | ||
692 | /* This is not very clever (and fast) but currently I don't know about | |
693 | * any other simple way of getting quota data to disk and we must get | |
694 | * them there for userspace to be visible... */ | |
695 | if (sb->s_op->sync_fs) | |
696 | sb->s_op->sync_fs(sb, 1); | |
697 | sync_blockdev(sb->s_bdev); | |
698 | ||
699 | /* | |
700 | * Now when everything is written we can discard the pagecache so | |
701 | * that userspace sees the changes. | |
702 | */ | |
5fb324ad CH |
703 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
704 | if (type != -1 && cnt != type) | |
705 | continue; | |
706 | if (!sb_has_quota_active(sb, cnt)) | |
707 | continue; | |
5955102c | 708 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 709 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 710 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 711 | } |
5fb324ad | 712 | |
1da177e4 LT |
713 | return 0; |
714 | } | |
287a8095 | 715 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 716 | |
1ab6c499 DC |
717 | static unsigned long |
718 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 719 | { |
1da177e4 | 720 | struct dquot *dquot; |
1ab6c499 | 721 | unsigned long freed = 0; |
1da177e4 | 722 | |
d68aab6b | 723 | spin_lock(&dq_list_lock); |
1822193b JK |
724 | while (!list_empty(&free_dquots) && sc->nr_to_scan) { |
725 | dquot = list_first_entry(&free_dquots, struct dquot, dq_free); | |
1da177e4 LT |
726 | remove_dquot_hash(dquot); |
727 | remove_free_dquot(dquot); | |
728 | remove_inuse(dquot); | |
74f783af | 729 | do_destroy_dquot(dquot); |
1ab6c499 DC |
730 | sc->nr_to_scan--; |
731 | freed++; | |
1da177e4 | 732 | } |
d68aab6b | 733 | spin_unlock(&dq_list_lock); |
1ab6c499 | 734 | return freed; |
1da177e4 LT |
735 | } |
736 | ||
1ab6c499 DC |
737 | static unsigned long |
738 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 739 | { |
55f841ce GC |
740 | return vfs_pressure_ratio( |
741 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
742 | } |
743 | ||
8e1f936b | 744 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
745 | .count_objects = dqcache_shrink_count, |
746 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
747 | .seeks = DEFAULT_SEEKS, |
748 | }; | |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Put reference to dquot | |
1da177e4 | 752 | */ |
3d9ea253 | 753 | void dqput(struct dquot *dquot) |
1da177e4 | 754 | { |
b48d3805 JK |
755 | int ret; |
756 | ||
1da177e4 LT |
757 | if (!dquot) |
758 | return; | |
62af9b52 | 759 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 760 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 761 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
762 | quotatypes[dquot->dq_id.type], |
763 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
764 | BUG(); |
765 | } | |
766 | #endif | |
dde95888 | 767 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
768 | we_slept: |
769 | spin_lock(&dq_list_lock); | |
770 | if (atomic_read(&dquot->dq_count) > 1) { | |
771 | /* We have more than one user... nothing to do */ | |
772 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 773 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 774 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 | 775 | atomic_read(&dquot->dq_count) == 1) |
503330f3 | 776 | wake_up(&dquot_ref_wq); |
1da177e4 LT |
777 | spin_unlock(&dq_list_lock); |
778 | return; | |
779 | } | |
780 | /* Need to release dquot? */ | |
4580b30e | 781 | if (dquot_dirty(dquot)) { |
1da177e4 LT |
782 | spin_unlock(&dq_list_lock); |
783 | /* Commit dquot before releasing */ | |
b48d3805 JK |
784 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
785 | if (ret < 0) { | |
fb5ffb0e JZ |
786 | quota_error(dquot->dq_sb, "Can't write quota structure" |
787 | " (error %d). Quota may get out of sync!", | |
788 | ret); | |
b48d3805 JK |
789 | /* |
790 | * We clear dirty bit anyway, so that we avoid | |
791 | * infinite loop here | |
792 | */ | |
b48d3805 | 793 | clear_dquot_dirty(dquot); |
b48d3805 | 794 | } |
1da177e4 LT |
795 | goto we_slept; |
796 | } | |
1da177e4 LT |
797 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
798 | spin_unlock(&dq_list_lock); | |
799 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
800 | goto we_slept; | |
801 | } | |
802 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 803 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 804 | /* sanity check */ |
8abf6a47 | 805 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
806 | #endif |
807 | put_dquot_last(dquot); | |
808 | spin_unlock(&dq_list_lock); | |
809 | } | |
08d0350c | 810 | EXPORT_SYMBOL(dqput); |
1da177e4 | 811 | |
7d9056ba | 812 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
813 | { |
814 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
815 | } | |
7d9056ba | 816 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 817 | |
1da177e4 LT |
818 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
819 | { | |
820 | struct dquot *dquot; | |
821 | ||
74f783af | 822 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 823 | if(!dquot) |
dd6f3c6d | 824 | return NULL; |
1da177e4 | 825 | |
d3be915f | 826 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
827 | INIT_LIST_HEAD(&dquot->dq_free); |
828 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
829 | INIT_HLIST_NODE(&dquot->dq_hash); | |
830 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
831 | dquot->dq_sb = sb; | |
1a06d420 | 832 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 | 833 | atomic_set(&dquot->dq_count, 1); |
7b9ca4c6 | 834 | spin_lock_init(&dquot->dq_dqb_lock); |
1da177e4 LT |
835 | |
836 | return dquot; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Get reference to dquot | |
cc33412f JK |
841 | * |
842 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
843 | * destroying our dquot by: | |
844 | * a) checking for quota flags under dq_list_lock and | |
845 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 846 | */ |
aca645a6 | 847 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 848 | { |
1a06d420 | 849 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 850 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 851 | |
d49d3762 EB |
852 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
853 | return ERR_PTR(-EINVAL); | |
854 | ||
1a06d420 | 855 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 856 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
857 | we_slept: |
858 | spin_lock(&dq_list_lock); | |
cc33412f | 859 | spin_lock(&dq_state_lock); |
1a06d420 | 860 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
861 | spin_unlock(&dq_state_lock); |
862 | spin_unlock(&dq_list_lock); | |
6184fc0b | 863 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
864 | goto out; |
865 | } | |
866 | spin_unlock(&dq_state_lock); | |
867 | ||
1a06d420 | 868 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
869 | if (!dquot) { |
870 | if (!empty) { | |
1da177e4 | 871 | spin_unlock(&dq_list_lock); |
1a06d420 | 872 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 873 | if (!empty) |
1da177e4 LT |
874 | schedule(); /* Try to wait for a moment... */ |
875 | goto we_slept; | |
876 | } | |
877 | dquot = empty; | |
dd6f3c6d | 878 | empty = NULL; |
4c376dca | 879 | dquot->dq_id = qid; |
1da177e4 LT |
880 | /* all dquots go on the inuse_list */ |
881 | put_inuse(dquot); | |
882 | /* hash it first so it can be found */ | |
883 | insert_dquot_hash(dquot); | |
1da177e4 | 884 | spin_unlock(&dq_list_lock); |
dde95888 | 885 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
886 | } else { |
887 | if (!atomic_read(&dquot->dq_count)) | |
888 | remove_free_dquot(dquot); | |
889 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 890 | spin_unlock(&dq_list_lock); |
dde95888 DM |
891 | dqstats_inc(DQST_CACHE_HITS); |
892 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 893 | } |
268157ba JK |
894 | /* Wait for dq_lock - after this we know that either dquot_release() is |
895 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 896 | wait_on_dquot(dquot); |
268157ba | 897 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
898 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
899 | int err; | |
900 | ||
901 | err = sb->dq_op->acquire_dquot(dquot); | |
902 | if (err < 0) { | |
903 | dqput(dquot); | |
904 | dquot = ERR_PTR(err); | |
905 | goto out; | |
906 | } | |
1da177e4 | 907 | } |
044c9b67 JK |
908 | /* |
909 | * Make sure following reads see filled structure - paired with | |
910 | * smp_mb__before_atomic() in dquot_acquire(). | |
911 | */ | |
912 | smp_rmb(); | |
62af9b52 | 913 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 914 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 915 | #endif |
cc33412f JK |
916 | out: |
917 | if (empty) | |
918 | do_destroy_dquot(empty); | |
1da177e4 LT |
919 | |
920 | return dquot; | |
921 | } | |
08d0350c | 922 | EXPORT_SYMBOL(dqget); |
1da177e4 | 923 | |
2d0fa467 JK |
924 | static inline struct dquot **i_dquot(struct inode *inode) |
925 | { | |
2d0fa467 JK |
926 | return inode->i_sb->s_op->get_dquots(inode); |
927 | } | |
928 | ||
1da177e4 LT |
929 | static int dqinit_needed(struct inode *inode, int type) |
930 | { | |
5bcd3b6f | 931 | struct dquot * const *dquots; |
1da177e4 LT |
932 | int cnt; |
933 | ||
934 | if (IS_NOQUOTA(inode)) | |
935 | return 0; | |
5bcd3b6f KK |
936 | |
937 | dquots = i_dquot(inode); | |
1da177e4 | 938 | if (type != -1) |
5bcd3b6f | 939 | return !dquots[type]; |
1da177e4 | 940 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 941 | if (!dquots[cnt]) |
1da177e4 LT |
942 | return 1; |
943 | return 0; | |
944 | } | |
945 | ||
c3b00446 | 946 | /* This routine is guarded by s_umount semaphore */ |
1a6152d3 | 947 | static int add_dquot_ref(struct super_block *sb, int type) |
1da177e4 | 948 | { |
941d2380 | 949 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 950 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 951 | int reserved = 0; |
4c5e6c0e | 952 | #endif |
1a6152d3 | 953 | int err = 0; |
1da177e4 | 954 | |
74278da9 | 955 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 956 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
957 | spin_lock(&inode->i_lock); |
958 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
959 | !atomic_read(&inode->i_writecount) || | |
960 | !dqinit_needed(inode, type)) { | |
961 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 962 | continue; |
250df6ed | 963 | } |
d003fb70 | 964 | __iget(inode); |
250df6ed | 965 | spin_unlock(&inode->i_lock); |
74278da9 | 966 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 967 | |
d7e97117 JK |
968 | #ifdef CONFIG_QUOTA_DEBUG |
969 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
970 | reserved = 1; | |
971 | #endif | |
941d2380 | 972 | iput(old_inode); |
1a6152d3 CY |
973 | err = __dquot_initialize(inode, type); |
974 | if (err) { | |
975 | iput(inode); | |
976 | goto out; | |
977 | } | |
55fa6091 DC |
978 | |
979 | /* | |
980 | * We hold a reference to 'inode' so it couldn't have been | |
981 | * removed from s_inodes list while we dropped the | |
74278da9 | 982 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 983 | * holding the last reference and we cannot iput it under |
74278da9 | 984 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
985 | * later. |
986 | */ | |
941d2380 | 987 | old_inode = inode; |
04646aeb | 988 | cond_resched(); |
74278da9 | 989 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 990 | } |
74278da9 | 991 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 992 | iput(old_inode); |
1a6152d3 | 993 | out: |
62af9b52 | 994 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 995 | if (reserved) { |
fb5ffb0e JZ |
996 | quota_error(sb, "Writes happened before quota was turned on " |
997 | "thus quota information is probably inconsistent. " | |
998 | "Please run quotacheck(8)"); | |
0a5a9c72 | 999 | } |
4c5e6c0e | 1000 | #endif |
1a6152d3 | 1001 | return err; |
1da177e4 LT |
1002 | } |
1003 | ||
268157ba JK |
1004 | /* |
1005 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 1006 | * if we have the last reference to dquot |
268157ba | 1007 | */ |
9eb6463f NY |
1008 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
1009 | struct list_head *tofree_head) | |
1da177e4 | 1010 | { |
5bcd3b6f KK |
1011 | struct dquot **dquots = i_dquot(inode); |
1012 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 1013 | |
9eb6463f NY |
1014 | if (!dquot) |
1015 | return; | |
1016 | ||
5bcd3b6f | 1017 | dquots[type] = NULL; |
9eb6463f NY |
1018 | if (list_empty(&dquot->dq_free)) { |
1019 | /* | |
1020 | * The inode still has reference to dquot so it can't be in the | |
1021 | * free list | |
1022 | */ | |
1023 | spin_lock(&dq_list_lock); | |
1024 | list_add(&dquot->dq_free, tofree_head); | |
1025 | spin_unlock(&dq_list_lock); | |
1026 | } else { | |
1027 | /* | |
1028 | * Dquot is already in a list to put so we won't drop the last | |
1029 | * reference here. | |
1030 | */ | |
1031 | dqput(dquot); | |
1da177e4 | 1032 | } |
1da177e4 LT |
1033 | } |
1034 | ||
268157ba JK |
1035 | /* |
1036 | * Free list of dquots | |
1037 | * Dquots are removed from inodes and no new references can be got so we are | |
1038 | * the only ones holding reference | |
1039 | */ | |
1da177e4 LT |
1040 | static void put_dquot_list(struct list_head *tofree_head) |
1041 | { | |
1042 | struct list_head *act_head; | |
1043 | struct dquot *dquot; | |
1044 | ||
1045 | act_head = tofree_head->next; | |
1da177e4 LT |
1046 | while (act_head != tofree_head) { |
1047 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1048 | act_head = act_head->next; | |
268157ba JK |
1049 | /* Remove dquot from the list so we won't have problems... */ |
1050 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1051 | dqput(dquot); |
1052 | } | |
1053 | } | |
1054 | ||
fb58b731 CH |
1055 | static void remove_dquot_ref(struct super_block *sb, int type, |
1056 | struct list_head *tofree_head) | |
1057 | { | |
1058 | struct inode *inode; | |
78bc3334 | 1059 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 | 1060 | int reserved = 0; |
78bc3334 | 1061 | #endif |
fb58b731 | 1062 | |
74278da9 | 1063 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1064 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1065 | /* |
1066 | * We have to scan also I_NEW inodes because they can already | |
1067 | * have quota pointer initialized. Luckily, we need to touch | |
1068 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1069 | * (dq_data_lock). |
aabb8fdb | 1070 | */ |
b9ba6f94 | 1071 | spin_lock(&dq_data_lock); |
7af9cce8 | 1072 | if (!IS_NOQUOTA(inode)) { |
78bc3334 | 1073 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 DM |
1074 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
1075 | reserved = 1; | |
78bc3334 | 1076 | #endif |
fb58b731 | 1077 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1078 | } |
b9ba6f94 | 1079 | spin_unlock(&dq_data_lock); |
fb58b731 | 1080 | } |
74278da9 | 1081 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1082 | #ifdef CONFIG_QUOTA_DEBUG |
1083 | if (reserved) { | |
1084 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1085 | " was disabled thus quota information is probably " | |
1086 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1087 | } | |
1088 | #endif | |
fb58b731 CH |
1089 | } |
1090 | ||
1da177e4 LT |
1091 | /* Gather all references from inodes and drop them */ |
1092 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1093 | { | |
1094 | LIST_HEAD(tofree_head); | |
1095 | ||
fb58b731 | 1096 | if (sb->dq_op) { |
fb58b731 | 1097 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1098 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1099 | put_dquot_list(&tofree_head); |
1100 | } | |
1da177e4 LT |
1101 | } |
1102 | ||
740d9dcd MC |
1103 | static inline |
1104 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1105 | { | |
0a5a9c72 JK |
1106 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1107 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1108 | else { | |
1109 | WARN_ON_ONCE(1); | |
1110 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1111 | } | |
41e327b5 | 1112 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1113 | dquot->dq_dqb.dqb_bsoftlimit) | |
1114 | dquot->dq_dqb.dqb_btime = (time64_t) 0; | |
1115 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
740d9dcd MC |
1116 | } |
1117 | ||
7a2435d8 | 1118 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1119 | { |
db49d2df JK |
1120 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1121 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1122 | dquot->dq_dqb.dqb_curinodes -= number; |
1123 | else | |
1124 | dquot->dq_dqb.dqb_curinodes = 0; | |
1125 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1126 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1127 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1128 | } | |
1129 | ||
7a2435d8 | 1130 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1131 | { |
db49d2df JK |
1132 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1133 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1134 | dquot->dq_dqb.dqb_curspace -= number; |
1135 | else | |
1136 | dquot->dq_dqb.dqb_curspace = 0; | |
41e327b5 | 1137 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1138 | dquot->dq_dqb.dqb_bsoftlimit) | |
e008bb61 | 1139 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1140 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1141 | } | |
1142 | ||
bf097aaf JK |
1143 | struct dquot_warn { |
1144 | struct super_block *w_sb; | |
7b9c7321 | 1145 | struct kqid w_dq_id; |
bf097aaf JK |
1146 | short w_type; |
1147 | }; | |
1148 | ||
c525460e JK |
1149 | static int warning_issued(struct dquot *dquot, const int warntype) |
1150 | { | |
1151 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1152 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1153 | ((warntype == QUOTA_NL_IHARDWARN || | |
1154 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1155 | ||
1156 | if (!flag) | |
1157 | return 0; | |
1158 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1159 | } | |
1160 | ||
8e893469 | 1161 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1162 | static int flag_print_warnings = 1; |
1163 | ||
bf097aaf | 1164 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1165 | { |
1166 | if (!flag_print_warnings) | |
1167 | return 0; | |
1168 | ||
7b9c7321 | 1169 | switch (warn->w_dq_id.type) { |
1da177e4 | 1170 | case USRQUOTA: |
1a06d420 | 1171 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1172 | case GRPQUOTA: |
7b9c7321 | 1173 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1174 | case PRJQUOTA: |
1175 | return 1; | |
1da177e4 LT |
1176 | } |
1177 | return 0; | |
1178 | } | |
1179 | ||
1da177e4 | 1180 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1181 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1182 | { |
1183 | char *msg = NULL; | |
24ec839c | 1184 | struct tty_struct *tty; |
bf097aaf | 1185 | int warntype = warn->w_type; |
1da177e4 | 1186 | |
657d3bfa JK |
1187 | if (warntype == QUOTA_NL_IHARDBELOW || |
1188 | warntype == QUOTA_NL_ISOFTBELOW || | |
1189 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1190 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1191 | return; |
1192 | ||
24ec839c PZ |
1193 | tty = get_current_tty(); |
1194 | if (!tty) | |
452a00d2 | 1195 | return; |
bf097aaf | 1196 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1197 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1198 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1199 | else |
24ec839c | 1200 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1201 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1202 | switch (warntype) { |
8e893469 | 1203 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1204 | msg = " file limit reached.\r\n"; |
1205 | break; | |
8e893469 | 1206 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1207 | msg = " file quota exceeded too long.\r\n"; |
1208 | break; | |
8e893469 | 1209 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1210 | msg = " file quota exceeded.\r\n"; |
1211 | break; | |
8e893469 | 1212 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1213 | msg = " block limit reached.\r\n"; |
1214 | break; | |
8e893469 | 1215 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1216 | msg = " block quota exceeded too long.\r\n"; |
1217 | break; | |
8e893469 | 1218 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1219 | msg = " block quota exceeded.\r\n"; |
1220 | break; | |
1221 | } | |
24ec839c | 1222 | tty_write_message(tty, msg); |
452a00d2 | 1223 | tty_kref_put(tty); |
1da177e4 | 1224 | } |
8e893469 JK |
1225 | #endif |
1226 | ||
bf097aaf JK |
1227 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1228 | int warntype) | |
1229 | { | |
1230 | if (warning_issued(dquot, warntype)) | |
1231 | return; | |
1232 | warn->w_type = warntype; | |
1233 | warn->w_sb = dquot->dq_sb; | |
1234 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1235 | } |
1236 | ||
f18df228 MC |
1237 | /* |
1238 | * Write warnings to the console and send warning messages over netlink. | |
1239 | * | |
bf097aaf | 1240 | * Note that this function can call into tty and networking code. |
f18df228 | 1241 | */ |
bf097aaf | 1242 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1243 | { |
1244 | int i; | |
1245 | ||
86e931a3 | 1246 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1247 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1248 | continue; | |
8e893469 | 1249 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1250 | print_warning(&warn[i]); |
8e893469 | 1251 | #endif |
7b9c7321 | 1252 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1253 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1254 | } |
1da177e4 LT |
1255 | } |
1256 | ||
7a2435d8 | 1257 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1258 | { |
4c376dca | 1259 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1260 | |
1261 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1262 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1263 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1264 | } |
1265 | ||
7b9ca4c6 JK |
1266 | static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, |
1267 | struct dquot_warn *warn) | |
1da177e4 | 1268 | { |
7b9ca4c6 JK |
1269 | qsize_t newinodes; |
1270 | int ret = 0; | |
268157ba | 1271 | |
7b9ca4c6 JK |
1272 | spin_lock(&dquot->dq_dqb_lock); |
1273 | newinodes = dquot->dq_dqb.dqb_curinodes + inodes; | |
4c376dca | 1274 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1275 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
7b9ca4c6 | 1276 | goto add; |
1da177e4 LT |
1277 | |
1278 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1279 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1280 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1281 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
7b9ca4c6 JK |
1282 | ret = -EDQUOT; |
1283 | goto out; | |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1287 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1288 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1289 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1290 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1291 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
7b9ca4c6 JK |
1292 | ret = -EDQUOT; |
1293 | goto out; | |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1297 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1298 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1299 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1300 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1301 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 | 1302 | } |
7b9ca4c6 JK |
1303 | add: |
1304 | dquot->dq_dqb.dqb_curinodes = newinodes; | |
1da177e4 | 1305 | |
7b9ca4c6 JK |
1306 | out: |
1307 | spin_unlock(&dquot->dq_dqb_lock); | |
1308 | return ret; | |
1da177e4 LT |
1309 | } |
1310 | ||
7b9ca4c6 JK |
1311 | static int dquot_add_space(struct dquot *dquot, qsize_t space, |
1312 | qsize_t rsv_space, unsigned int flags, | |
1313 | struct dquot_warn *warn) | |
1da177e4 | 1314 | { |
f18df228 | 1315 | qsize_t tspace; |
268157ba | 1316 | struct super_block *sb = dquot->dq_sb; |
7b9ca4c6 | 1317 | int ret = 0; |
f18df228 | 1318 | |
7b9ca4c6 | 1319 | spin_lock(&dquot->dq_dqb_lock); |
4c376dca | 1320 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1321 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
ac3d7939 | 1322 | goto finish; |
1da177e4 | 1323 | |
f18df228 | 1324 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
7b9ca4c6 JK |
1325 | + space + rsv_space; |
1326 | ||
1da177e4 | 1327 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1328 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 | 1329 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1330 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1331 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
7b9ca4c6 | 1332 | ret = -EDQUOT; |
ac3d7939 | 1333 | goto finish; |
1da177e4 LT |
1334 | } |
1335 | ||
1336 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1337 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1338 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1339 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 | 1340 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1341 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1342 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
7b9ca4c6 | 1343 | ret = -EDQUOT; |
ac3d7939 | 1344 | goto finish; |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1348 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 | 1349 | dquot->dq_dqb.dqb_btime == 0) { |
7b9ca4c6 | 1350 | if (flags & DQUOT_SPACE_WARN) { |
bf097aaf | 1351 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1352 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1353 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
7b9ca4c6 | 1354 | } else { |
1da177e4 LT |
1355 | /* |
1356 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1357 | * be always printed | |
1358 | */ | |
7b9ca4c6 | 1359 | ret = -EDQUOT; |
ac3d7939 | 1360 | goto finish; |
7b9ca4c6 | 1361 | } |
1da177e4 | 1362 | } |
ac3d7939 JK |
1363 | finish: |
1364 | /* | |
1365 | * We have to be careful and go through warning generation & grace time | |
1366 | * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it | |
1367 | * only here... | |
1368 | */ | |
1369 | if (flags & DQUOT_SPACE_NOFAIL) | |
1370 | ret = 0; | |
1371 | if (!ret) { | |
1372 | dquot->dq_dqb.dqb_rsvspace += rsv_space; | |
1373 | dquot->dq_dqb.dqb_curspace += space; | |
1374 | } | |
7b9ca4c6 JK |
1375 | spin_unlock(&dquot->dq_dqb_lock); |
1376 | return ret; | |
1da177e4 LT |
1377 | } |
1378 | ||
12095460 | 1379 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1380 | { |
268157ba JK |
1381 | qsize_t newinodes; |
1382 | ||
657d3bfa | 1383 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1384 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1385 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1386 | return QUOTA_NL_NOWARN; |
1387 | ||
268157ba JK |
1388 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1389 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1390 | return QUOTA_NL_ISOFTBELOW; |
1391 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1392 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1393 | return QUOTA_NL_IHARDBELOW; |
1394 | return QUOTA_NL_NOWARN; | |
1395 | } | |
1396 | ||
1397 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1398 | { | |
41e327b5 | 1399 | qsize_t tspace; |
1400 | ||
1401 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; | |
1402 | ||
657d3bfa | 1403 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
41e327b5 | 1404 | tspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1405 | return QUOTA_NL_NOWARN; |
1406 | ||
41e327b5 | 1407 | if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1408 | return QUOTA_NL_BSOFTBELOW; |
41e327b5 | 1409 | if (tspace >= dquot->dq_dqb.dqb_bhardlimit && |
1410 | tspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1411 | return QUOTA_NL_BHARDBELOW; |
1412 | return QUOTA_NL_NOWARN; | |
1413 | } | |
0a5a9c72 | 1414 | |
189eef59 CH |
1415 | static int dquot_active(const struct inode *inode) |
1416 | { | |
1417 | struct super_block *sb = inode->i_sb; | |
1418 | ||
1419 | if (IS_NOQUOTA(inode)) | |
1420 | return 0; | |
1421 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1422 | } | |
1423 | ||
1da177e4 | 1424 | /* |
871a2931 CH |
1425 | * Initialize quota pointers in inode |
1426 | * | |
871a2931 CH |
1427 | * It is better to call this function outside of any transaction as it |
1428 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1429 | */ |
6184fc0b | 1430 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1431 | { |
1ea06bec | 1432 | int cnt, init_needed = 0; |
ab73ef46 | 1433 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1434 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1435 | qsize_t rsv; |
6184fc0b | 1436 | int ret = 0; |
1da177e4 | 1437 | |
189eef59 | 1438 | if (!dquot_active(inode)) |
6184fc0b | 1439 | return 0; |
cc33412f | 1440 | |
5bcd3b6f KK |
1441 | dquots = i_dquot(inode); |
1442 | ||
cc33412f JK |
1443 | /* First get references to structures we might need. */ |
1444 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1445 | struct kqid qid; |
847aac64 LX |
1446 | kprojid_t projid; |
1447 | int rc; | |
6184fc0b | 1448 | struct dquot *dquot; |
847aac64 | 1449 | |
cc33412f JK |
1450 | if (type != -1 && cnt != type) |
1451 | continue; | |
1ea06bec NY |
1452 | /* |
1453 | * The i_dquot should have been initialized in most cases, | |
1454 | * we check it without locking here to avoid unnecessary | |
1455 | * dqget()/dqput() calls. | |
1456 | */ | |
5bcd3b6f | 1457 | if (dquots[cnt]) |
1ea06bec | 1458 | continue; |
847aac64 LX |
1459 | |
1460 | if (!sb_has_quota_active(sb, cnt)) | |
1461 | continue; | |
1462 | ||
1ea06bec NY |
1463 | init_needed = 1; |
1464 | ||
cc33412f JK |
1465 | switch (cnt) { |
1466 | case USRQUOTA: | |
aca645a6 | 1467 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1468 | break; |
1469 | case GRPQUOTA: | |
aca645a6 | 1470 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1471 | break; |
847aac64 LX |
1472 | case PRJQUOTA: |
1473 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1474 | if (rc) | |
1475 | continue; | |
1476 | qid = make_kqid_projid(projid); | |
1477 | break; | |
cc33412f | 1478 | } |
6184fc0b JK |
1479 | dquot = dqget(sb, qid); |
1480 | if (IS_ERR(dquot)) { | |
1481 | /* We raced with somebody turning quotas off... */ | |
1482 | if (PTR_ERR(dquot) != -ESRCH) { | |
1483 | ret = PTR_ERR(dquot); | |
1484 | goto out_put; | |
1485 | } | |
1486 | dquot = NULL; | |
1487 | } | |
1488 | got[cnt] = dquot; | |
cc33412f JK |
1489 | } |
1490 | ||
1ea06bec NY |
1491 | /* All required i_dquot has been initialized */ |
1492 | if (!init_needed) | |
6184fc0b | 1493 | return 0; |
1ea06bec | 1494 | |
b9ba6f94 | 1495 | spin_lock(&dq_data_lock); |
1da177e4 | 1496 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1497 | goto out_lock; |
1da177e4 LT |
1498 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1499 | if (type != -1 && cnt != type) | |
1500 | continue; | |
cc33412f JK |
1501 | /* Avoid races with quotaoff() */ |
1502 | if (!sb_has_quota_active(sb, cnt)) | |
1503 | continue; | |
4408ea41 JK |
1504 | /* We could race with quotaon or dqget() could have failed */ |
1505 | if (!got[cnt]) | |
1506 | continue; | |
5bcd3b6f KK |
1507 | if (!dquots[cnt]) { |
1508 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1509 | got[cnt] = NULL; |
0a5a9c72 JK |
1510 | /* |
1511 | * Make quota reservation system happy if someone | |
1512 | * did a write before quota was turned on | |
1513 | */ | |
1514 | rsv = inode_get_rsv_space(inode); | |
7b9ca4c6 JK |
1515 | if (unlikely(rsv)) { |
1516 | spin_lock(&inode->i_lock); | |
1517 | /* Get reservation again under proper lock */ | |
1518 | rsv = __inode_get_rsv_space(inode); | |
1519 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1520 | dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; | |
1521 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1522 | spin_unlock(&inode->i_lock); | |
1523 | } | |
1da177e4 LT |
1524 | } |
1525 | } | |
6184fc0b | 1526 | out_lock: |
b9ba6f94 | 1527 | spin_unlock(&dq_data_lock); |
6184fc0b | 1528 | out_put: |
cc33412f | 1529 | /* Drop unused references */ |
dc52dd3a | 1530 | dqput_all(got); |
6184fc0b JK |
1531 | |
1532 | return ret; | |
871a2931 CH |
1533 | } |
1534 | ||
6184fc0b | 1535 | int dquot_initialize(struct inode *inode) |
871a2931 | 1536 | { |
6184fc0b | 1537 | return __dquot_initialize(inode, -1); |
1da177e4 | 1538 | } |
08d0350c | 1539 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1540 | |
b8cb5a54 TE |
1541 | bool dquot_initialize_needed(struct inode *inode) |
1542 | { | |
1543 | struct dquot **dquots; | |
1544 | int i; | |
1545 | ||
1546 | if (!dquot_active(inode)) | |
1547 | return false; | |
1548 | ||
1549 | dquots = i_dquot(inode); | |
1550 | for (i = 0; i < MAXQUOTAS; i++) | |
1551 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1552 | return true; | |
1553 | return false; | |
1554 | } | |
1555 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1556 | ||
1da177e4 | 1557 | /* |
b9ba6f94 NY |
1558 | * Release all quotas referenced by inode. |
1559 | * | |
1560 | * This function only be called on inode free or converting | |
1561 | * a file to quota file, no other users for the i_dquot in | |
1562 | * both cases, so we needn't call synchronize_srcu() after | |
1563 | * clearing i_dquot. | |
1da177e4 | 1564 | */ |
9f754758 | 1565 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1566 | { |
1567 | int cnt; | |
5bcd3b6f | 1568 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1569 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1570 | |
b9ba6f94 | 1571 | spin_lock(&dq_data_lock); |
1da177e4 | 1572 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1573 | put[cnt] = dquots[cnt]; |
1574 | dquots[cnt] = NULL; | |
1da177e4 | 1575 | } |
b9ba6f94 | 1576 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1577 | dqput_all(put); |
1da177e4 LT |
1578 | } |
1579 | ||
9f754758 CH |
1580 | void dquot_drop(struct inode *inode) |
1581 | { | |
5bcd3b6f | 1582 | struct dquot * const *dquots; |
9f754758 CH |
1583 | int cnt; |
1584 | ||
1585 | if (IS_NOQUOTA(inode)) | |
1586 | return; | |
1587 | ||
1588 | /* | |
1589 | * Test before calling to rule out calls from proc and such | |
1590 | * where we are not allowed to block. Note that this is | |
1591 | * actually reliable test even without the lock - the caller | |
1592 | * must assure that nobody can come after the DQUOT_DROP and | |
1593 | * add quota pointers back anyway. | |
1594 | */ | |
5bcd3b6f | 1595 | dquots = i_dquot(inode); |
9f754758 | 1596 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1597 | if (dquots[cnt]) |
9f754758 CH |
1598 | break; |
1599 | } | |
1600 | ||
1601 | if (cnt < MAXQUOTAS) | |
1602 | __dquot_drop(inode); | |
1603 | } | |
1604 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1605 | |
fd8fbfc1 DM |
1606 | /* |
1607 | * inode_reserved_space is managed internally by quota, and protected by | |
1608 | * i_lock similar to i_blocks+i_bytes. | |
1609 | */ | |
1610 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1611 | { | |
1612 | /* Filesystem must explicitly define it's own method in order to use | |
1613 | * quota reservation interface */ | |
1614 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1615 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1616 | } | |
1617 | ||
7b9ca4c6 | 1618 | static qsize_t __inode_get_rsv_space(struct inode *inode) |
fd8fbfc1 | 1619 | { |
7b9ca4c6 JK |
1620 | if (!inode->i_sb->dq_op->get_reserved_space) |
1621 | return 0; | |
1622 | return *inode_reserved_space(inode); | |
fd8fbfc1 DM |
1623 | } |
1624 | ||
1625 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1626 | { | |
1627 | qsize_t ret; | |
05b5d898 JK |
1628 | |
1629 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1630 | return 0; | |
fd8fbfc1 | 1631 | spin_lock(&inode->i_lock); |
7b9ca4c6 | 1632 | ret = __inode_get_rsv_space(inode); |
fd8fbfc1 DM |
1633 | spin_unlock(&inode->i_lock); |
1634 | return ret; | |
1635 | } | |
1636 | ||
1da177e4 | 1637 | /* |
5dd4056d CH |
1638 | * This functions updates i_blocks+i_bytes fields and quota information |
1639 | * (together with appropriate checks). | |
1640 | * | |
1641 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1642 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1643 | * the current transaction so that dquot write and inode write go into the | |
1644 | * same transaction. | |
1da177e4 LT |
1645 | */ |
1646 | ||
1647 | /* | |
1648 | * This operation can block, but only after everything is updated | |
1649 | */ | |
56246f9a | 1650 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1651 | { |
b9ba6f94 | 1652 | int cnt, ret = 0, index; |
bf097aaf | 1653 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1654 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1655 | struct dquot **dquots; |
1da177e4 | 1656 | |
189eef59 | 1657 | if (!dquot_active(inode)) { |
a478e522 JK |
1658 | if (reserve) { |
1659 | spin_lock(&inode->i_lock); | |
1660 | *inode_reserved_space(inode) += number; | |
1661 | spin_unlock(&inode->i_lock); | |
1662 | } else { | |
1663 | inode_add_bytes(inode, number); | |
1664 | } | |
fd8fbfc1 DM |
1665 | goto out; |
1666 | } | |
1667 | ||
1da177e4 | 1668 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1669 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1670 | |
5bcd3b6f | 1671 | dquots = i_dquot(inode); |
b9ba6f94 | 1672 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1673 | spin_lock(&inode->i_lock); |
1da177e4 | 1674 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1675 | if (!dquots[cnt]) |
1da177e4 | 1676 | continue; |
df15a2a5 | 1677 | if (reserve) { |
7b9ca4c6 JK |
1678 | ret = dquot_add_space(dquots[cnt], 0, number, flags, |
1679 | &warn[cnt]); | |
1680 | } else { | |
1681 | ret = dquot_add_space(dquots[cnt], number, 0, flags, | |
1682 | &warn[cnt]); | |
1683 | } | |
1684 | if (ret) { | |
1685 | /* Back out changes we already did */ | |
1686 | for (cnt--; cnt >= 0; cnt--) { | |
1687 | if (!dquots[cnt]) | |
1688 | continue; | |
1689 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a CX |
1690 | if (reserve) |
1691 | dquot_free_reserved_space(dquots[cnt], | |
1692 | number); | |
1693 | else | |
1694 | dquot_decr_space(dquots[cnt], number); | |
7b9ca4c6 JK |
1695 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1696 | } | |
1697 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 | 1698 | goto out_flush_warn; |
f18df228 | 1699 | } |
1da177e4 | 1700 | } |
7b9ca4c6 | 1701 | if (reserve) |
a478e522 | 1702 | *inode_reserved_space(inode) += number; |
7b9ca4c6 JK |
1703 | else |
1704 | __inode_add_bytes(inode, number); | |
1705 | spin_unlock(&inode->i_lock); | |
f18df228 | 1706 | |
fd8fbfc1 DM |
1707 | if (reserve) |
1708 | goto out_flush_warn; | |
bf097aaf | 1709 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1710 | out_flush_warn: |
b9ba6f94 | 1711 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1712 | flush_warnings(warn); |
f18df228 MC |
1713 | out: |
1714 | return ret; | |
1715 | } | |
5dd4056d | 1716 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1717 | |
1718 | /* | |
1719 | * This operation can block, but only after everything is updated | |
1720 | */ | |
6bab3596 | 1721 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1722 | { |
b9ba6f94 | 1723 | int cnt, ret = 0, index; |
bf097aaf | 1724 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1725 | struct dquot * const *dquots; |
1da177e4 | 1726 | |
189eef59 | 1727 | if (!dquot_active(inode)) |
63936dda | 1728 | return 0; |
1da177e4 | 1729 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1730 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1731 | |
5bcd3b6f | 1732 | dquots = i_dquot(inode); |
b9ba6f94 | 1733 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1734 | spin_lock(&inode->i_lock); |
1da177e4 | 1735 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1736 | if (!dquots[cnt]) |
1da177e4 | 1737 | continue; |
7b9ca4c6 JK |
1738 | ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); |
1739 | if (ret) { | |
1740 | for (cnt--; cnt >= 0; cnt--) { | |
1741 | if (!dquots[cnt]) | |
1742 | continue; | |
1743 | /* Back out changes we already did */ | |
1744 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a | 1745 | dquot_decr_inodes(dquots[cnt], 1); |
7b9ca4c6 JK |
1746 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1747 | } | |
1da177e4 | 1748 | goto warn_put_all; |
7b9ca4c6 | 1749 | } |
1da177e4 | 1750 | } |
efd8f0e6 | 1751 | |
1da177e4 | 1752 | warn_put_all: |
7b9ca4c6 | 1753 | spin_unlock(&inode->i_lock); |
63936dda | 1754 | if (ret == 0) |
bf097aaf | 1755 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1756 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1757 | flush_warnings(warn); |
1da177e4 LT |
1758 | return ret; |
1759 | } | |
08d0350c | 1760 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1761 | |
5dd4056d CH |
1762 | /* |
1763 | * Convert in-memory reserved quotas to real consumed quotas | |
1764 | */ | |
1765 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1766 | { |
5bcd3b6f | 1767 | struct dquot **dquots; |
b9ba6f94 | 1768 | int cnt, index; |
740d9dcd | 1769 | |
189eef59 | 1770 | if (!dquot_active(inode)) { |
0ed60de3 JK |
1771 | spin_lock(&inode->i_lock); |
1772 | *inode_reserved_space(inode) -= number; | |
1773 | __inode_add_bytes(inode, number); | |
1774 | spin_unlock(&inode->i_lock); | |
5dd4056d | 1775 | return 0; |
740d9dcd MC |
1776 | } |
1777 | ||
5bcd3b6f | 1778 | dquots = i_dquot(inode); |
b9ba6f94 | 1779 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1780 | spin_lock(&inode->i_lock); |
740d9dcd MC |
1781 | /* Claim reserved quotas to allocated quotas */ |
1782 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1783 | if (dquots[cnt]) { |
1784 | struct dquot *dquot = dquots[cnt]; | |
1785 | ||
7b9ca4c6 | 1786 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1787 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) |
1788 | number = dquot->dq_dqb.dqb_rsvspace; | |
1789 | dquot->dq_dqb.dqb_curspace += number; | |
1790 | dquot->dq_dqb.dqb_rsvspace -= number; | |
7b9ca4c6 | 1791 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1792 | } |
740d9dcd MC |
1793 | } |
1794 | /* Update inode bytes */ | |
0ed60de3 JK |
1795 | *inode_reserved_space(inode) -= number; |
1796 | __inode_add_bytes(inode, number); | |
1797 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1798 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1799 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1800 | return 0; |
740d9dcd | 1801 | } |
5dd4056d | 1802 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1803 | |
1c8924eb JK |
1804 | /* |
1805 | * Convert allocated space back to in-memory reserved quotas | |
1806 | */ | |
1807 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1808 | { | |
5bcd3b6f | 1809 | struct dquot **dquots; |
b9ba6f94 | 1810 | int cnt, index; |
1c8924eb JK |
1811 | |
1812 | if (!dquot_active(inode)) { | |
0ed60de3 JK |
1813 | spin_lock(&inode->i_lock); |
1814 | *inode_reserved_space(inode) += number; | |
1815 | __inode_sub_bytes(inode, number); | |
1816 | spin_unlock(&inode->i_lock); | |
1c8924eb JK |
1817 | return; |
1818 | } | |
1819 | ||
5bcd3b6f | 1820 | dquots = i_dquot(inode); |
b9ba6f94 | 1821 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1822 | spin_lock(&inode->i_lock); |
1c8924eb JK |
1823 | /* Claim reserved quotas to allocated quotas */ |
1824 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1825 | if (dquots[cnt]) { |
1826 | struct dquot *dquot = dquots[cnt]; | |
1827 | ||
7b9ca4c6 | 1828 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1829 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) |
1830 | number = dquot->dq_dqb.dqb_curspace; | |
1831 | dquot->dq_dqb.dqb_rsvspace += number; | |
1832 | dquot->dq_dqb.dqb_curspace -= number; | |
7b9ca4c6 | 1833 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1834 | } |
1c8924eb JK |
1835 | } |
1836 | /* Update inode bytes */ | |
0ed60de3 JK |
1837 | *inode_reserved_space(inode) += number; |
1838 | __inode_sub_bytes(inode, number); | |
1839 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1840 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1841 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1842 | return; |
1843 | } | |
1844 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1845 | ||
1da177e4 LT |
1846 | /* |
1847 | * This operation can block, but only after everything is updated | |
1848 | */ | |
56246f9a | 1849 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1850 | { |
1851 | unsigned int cnt; | |
bf097aaf | 1852 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1853 | struct dquot **dquots; |
b9ba6f94 | 1854 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1855 | |
189eef59 | 1856 | if (!dquot_active(inode)) { |
a478e522 JK |
1857 | if (reserve) { |
1858 | spin_lock(&inode->i_lock); | |
1859 | *inode_reserved_space(inode) -= number; | |
1860 | spin_unlock(&inode->i_lock); | |
1861 | } else { | |
1862 | inode_sub_bytes(inode, number); | |
1863 | } | |
5dd4056d | 1864 | return; |
1da177e4 | 1865 | } |
657d3bfa | 1866 | |
5bcd3b6f | 1867 | dquots = i_dquot(inode); |
b9ba6f94 | 1868 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1869 | spin_lock(&inode->i_lock); |
1da177e4 | 1870 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1871 | int wtype; |
1872 | ||
1873 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1874 | if (!dquots[cnt]) | |
1da177e4 | 1875 | continue; |
7b9ca4c6 | 1876 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1877 | wtype = info_bdq_free(dquots[cnt], number); |
1878 | if (wtype != QUOTA_NL_NOWARN) | |
1879 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1880 | if (reserve) |
bf097aaf | 1881 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1882 | else |
bf097aaf | 1883 | dquot_decr_space(dquots[cnt], number); |
7b9ca4c6 | 1884 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1885 | } |
7b9ca4c6 | 1886 | if (reserve) |
a478e522 | 1887 | *inode_reserved_space(inode) -= number; |
7b9ca4c6 JK |
1888 | else |
1889 | __inode_sub_bytes(inode, number); | |
1890 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 DM |
1891 | |
1892 | if (reserve) | |
1893 | goto out_unlock; | |
bf097aaf | 1894 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1895 | out_unlock: |
b9ba6f94 | 1896 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1897 | flush_warnings(warn); |
fd8fbfc1 | 1898 | } |
5dd4056d | 1899 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1900 | |
1da177e4 LT |
1901 | /* |
1902 | * This operation can block, but only after everything is updated | |
1903 | */ | |
6bab3596 | 1904 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1905 | { |
1906 | unsigned int cnt; | |
bf097aaf | 1907 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1908 | struct dquot * const *dquots; |
b9ba6f94 | 1909 | int index; |
1da177e4 | 1910 | |
189eef59 | 1911 | if (!dquot_active(inode)) |
63936dda | 1912 | return; |
657d3bfa | 1913 | |
5bcd3b6f | 1914 | dquots = i_dquot(inode); |
b9ba6f94 | 1915 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1916 | spin_lock(&inode->i_lock); |
1da177e4 | 1917 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1918 | int wtype; |
1919 | ||
1920 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1921 | if (!dquots[cnt]) | |
1da177e4 | 1922 | continue; |
7b9ca4c6 | 1923 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1924 | wtype = info_idq_free(dquots[cnt], 1); |
1925 | if (wtype != QUOTA_NL_NOWARN) | |
1926 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1927 | dquot_decr_inodes(dquots[cnt], 1); | |
7b9ca4c6 | 1928 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1929 | } |
7b9ca4c6 | 1930 | spin_unlock(&inode->i_lock); |
bf097aaf | 1931 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1932 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1933 | flush_warnings(warn); |
1da177e4 | 1934 | } |
08d0350c | 1935 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1936 | |
1937 | /* | |
1938 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1939 | * On success, dquot references in transfer_to are consumed and references |
1940 | * to original dquots that need to be released are placed there. On failure, | |
1941 | * references are kept untouched. | |
1da177e4 LT |
1942 | * |
1943 | * This operation can block, but only after everything is updated | |
1944 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1945 | * |
b9ba6f94 NY |
1946 | * We are holding reference on transfer_from & transfer_to, no need to |
1947 | * protect them by srcu_read_lock(). | |
1da177e4 | 1948 | */ |
bc8e5f07 | 1949 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1950 | { |
7b9ca4c6 | 1951 | qsize_t cur_space; |
740d9dcd | 1952 | qsize_t rsv_space = 0; |
7a9ca53a | 1953 | qsize_t inode_usage = 1; |
bc8e5f07 | 1954 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1955 | int cnt, ret = 0; |
9e32784b | 1956 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1957 | struct dquot_warn warn_to[MAXQUOTAS]; |
1958 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1959 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1960 | |
1da177e4 | 1961 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1962 | return 0; |
7a9ca53a TE |
1963 | |
1964 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1965 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1966 | if (ret) | |
1967 | return ret; | |
1968 | } | |
1969 | ||
cc33412f | 1970 | /* Initialize the arrays */ |
bf097aaf JK |
1971 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1972 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1973 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1974 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1975 | } | |
b9ba6f94 NY |
1976 | |
1977 | spin_lock(&dq_data_lock); | |
7b9ca4c6 | 1978 | spin_lock(&inode->i_lock); |
cc33412f | 1979 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
7b9ca4c6 | 1980 | spin_unlock(&inode->i_lock); |
b9ba6f94 | 1981 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1982 | return 0; |
cc33412f | 1983 | } |
7b9ca4c6 JK |
1984 | cur_space = __inode_get_bytes(inode); |
1985 | rsv_space = __inode_get_rsv_space(inode); | |
1986 | /* | |
1987 | * Build the transfer_from list, check limits, and update usage in | |
1988 | * the target structures. | |
1989 | */ | |
1da177e4 | 1990 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b D |
1991 | /* |
1992 | * Skip changes for same uid or gid or for turned off quota-type. | |
1993 | */ | |
dd6f3c6d | 1994 | if (!transfer_to[cnt]) |
1da177e4 | 1995 | continue; |
9e32784b D |
1996 | /* Avoid races with quotaoff() */ |
1997 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1998 | continue; | |
1999 | is_valid[cnt] = 1; | |
2d0fa467 | 2000 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7b9ca4c6 JK |
2001 | ret = dquot_add_inodes(transfer_to[cnt], inode_usage, |
2002 | &warn_to[cnt]); | |
efd8f0e6 CH |
2003 | if (ret) |
2004 | goto over_quota; | |
c6d9c35d | 2005 | ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, |
2006 | DQUOT_SPACE_WARN, &warn_to[cnt]); | |
7b9ca4c6 | 2007 | if (ret) { |
0a51fb71 | 2008 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); |
7b9ca4c6 | 2009 | dquot_decr_inodes(transfer_to[cnt], inode_usage); |
0a51fb71 | 2010 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); |
cc33412f | 2011 | goto over_quota; |
7b9ca4c6 | 2012 | } |
1da177e4 LT |
2013 | } |
2014 | ||
7b9ca4c6 | 2015 | /* Decrease usage for source structures and update quota pointers */ |
1da177e4 | 2016 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b | 2017 | if (!is_valid[cnt]) |
1da177e4 | 2018 | continue; |
1da177e4 LT |
2019 | /* Due to IO error we might not have transfer_from[] structure */ |
2020 | if (transfer_from[cnt]) { | |
bf097aaf | 2021 | int wtype; |
7b9ca4c6 JK |
2022 | |
2023 | spin_lock(&transfer_from[cnt]->dq_dqb_lock); | |
7a9ca53a | 2024 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
2025 | if (wtype != QUOTA_NL_NOWARN) |
2026 | prepare_warning(&warn_from_inodes[cnt], | |
2027 | transfer_from[cnt], wtype); | |
7b9ca4c6 JK |
2028 | wtype = info_bdq_free(transfer_from[cnt], |
2029 | cur_space + rsv_space); | |
bf097aaf JK |
2030 | if (wtype != QUOTA_NL_NOWARN) |
2031 | prepare_warning(&warn_from_space[cnt], | |
2032 | transfer_from[cnt], wtype); | |
7a9ca53a | 2033 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
2034 | dquot_decr_space(transfer_from[cnt], cur_space); |
2035 | dquot_free_reserved_space(transfer_from[cnt], | |
2036 | rsv_space); | |
7b9ca4c6 | 2037 | spin_unlock(&transfer_from[cnt]->dq_dqb_lock); |
1da177e4 | 2038 | } |
2d0fa467 | 2039 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 2040 | } |
7b9ca4c6 | 2041 | spin_unlock(&inode->i_lock); |
1da177e4 | 2042 | spin_unlock(&dq_data_lock); |
cc33412f | 2043 | |
dc52dd3a DM |
2044 | mark_all_dquot_dirty(transfer_from); |
2045 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
2046 | flush_warnings(warn_to); |
2047 | flush_warnings(warn_from_inodes); | |
2048 | flush_warnings(warn_from_space); | |
bc8e5f07 | 2049 | /* Pass back references to put */ |
dc52dd3a | 2050 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
2051 | if (is_valid[cnt]) |
2052 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 2053 | return 0; |
cc33412f | 2054 | over_quota: |
7b9ca4c6 JK |
2055 | /* Back out changes we already did */ |
2056 | for (cnt--; cnt >= 0; cnt--) { | |
2057 | if (!is_valid[cnt]) | |
2058 | continue; | |
2059 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); | |
2060 | dquot_decr_inodes(transfer_to[cnt], inode_usage); | |
2061 | dquot_decr_space(transfer_to[cnt], cur_space); | |
2062 | dquot_free_reserved_space(transfer_to[cnt], rsv_space); | |
2063 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); | |
2064 | } | |
2065 | spin_unlock(&inode->i_lock); | |
cc33412f | 2066 | spin_unlock(&dq_data_lock); |
bf097aaf | 2067 | flush_warnings(warn_to); |
86f3cbec | 2068 | return ret; |
1da177e4 | 2069 | } |
bc8e5f07 | 2070 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2071 | |
8ddd69d6 DM |
2072 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2073 | * Called from FSXXX_setattr() | |
2074 | */ | |
b43fa828 | 2075 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2076 | { |
bc8e5f07 | 2077 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2078 | struct dquot *dquot; |
bc8e5f07 JK |
2079 | struct super_block *sb = inode->i_sb; |
2080 | int ret; | |
8ddd69d6 | 2081 | |
189eef59 | 2082 | if (!dquot_active(inode)) |
bc8e5f07 | 2083 | return 0; |
12755627 | 2084 | |
6184fc0b JK |
2085 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2086 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2087 | if (IS_ERR(dquot)) { | |
2088 | if (PTR_ERR(dquot) != -ESRCH) { | |
2089 | ret = PTR_ERR(dquot); | |
2090 | goto out_put; | |
2091 | } | |
2092 | dquot = NULL; | |
2093 | } | |
2094 | transfer_to[USRQUOTA] = dquot; | |
2095 | } | |
2096 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2097 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2098 | if (IS_ERR(dquot)) { | |
2099 | if (PTR_ERR(dquot) != -ESRCH) { | |
2100 | ret = PTR_ERR(dquot); | |
2101 | goto out_put; | |
2102 | } | |
2103 | dquot = NULL; | |
2104 | } | |
2105 | transfer_to[GRPQUOTA] = dquot; | |
2106 | } | |
bc8e5f07 | 2107 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2108 | out_put: |
bc8e5f07 JK |
2109 | dqput_all(transfer_to); |
2110 | return ret; | |
b85f4b87 | 2111 | } |
b43fa828 | 2112 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2113 | |
1da177e4 LT |
2114 | /* |
2115 | * Write info of quota file to disk | |
2116 | */ | |
2117 | int dquot_commit_info(struct super_block *sb, int type) | |
2118 | { | |
1da177e4 LT |
2119 | struct quota_info *dqopt = sb_dqopt(sb); |
2120 | ||
9a8ae30e | 2121 | return dqopt->ops[type]->write_file_info(sb, type); |
1da177e4 | 2122 | } |
08d0350c | 2123 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2124 | |
be6257b2 JK |
2125 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2126 | { | |
2127 | struct quota_info *dqopt = sb_dqopt(sb); | |
be6257b2 | 2128 | |
9d1ccbe7 JK |
2129 | if (!sb_has_quota_active(sb, qid->type)) |
2130 | return -ESRCH; | |
2131 | if (!dqopt->ops[qid->type]->get_next_id) | |
2132 | return -ENOSYS; | |
f14618c6 | 2133 | return dqopt->ops[qid->type]->get_next_id(sb, qid); |
be6257b2 JK |
2134 | } |
2135 | EXPORT_SYMBOL(dquot_get_next_id); | |
2136 | ||
1da177e4 LT |
2137 | /* |
2138 | * Definitions of diskquota operations. | |
2139 | */ | |
61e225dc | 2140 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2141 | .write_dquot = dquot_commit, |
2142 | .acquire_dquot = dquot_acquire, | |
2143 | .release_dquot = dquot_release, | |
2144 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2145 | .write_info = dquot_commit_info, |
2146 | .alloc_dquot = dquot_alloc, | |
2147 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2148 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2149 | }; |
123e9caf | 2150 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2151 | |
907f4554 CH |
2152 | /* |
2153 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2154 | */ | |
2155 | int dquot_file_open(struct inode *inode, struct file *file) | |
2156 | { | |
2157 | int error; | |
2158 | ||
2159 | error = generic_file_open(inode, file); | |
2160 | if (!error && (file->f_mode & FMODE_WRITE)) | |
88d8ff97 | 2161 | error = dquot_initialize(inode); |
907f4554 CH |
2162 | return error; |
2163 | } | |
2164 | EXPORT_SYMBOL(dquot_file_open); | |
2165 | ||
2ec1f301 JK |
2166 | static void vfs_cleanup_quota_inode(struct super_block *sb, int type) |
2167 | { | |
2168 | struct quota_info *dqopt = sb_dqopt(sb); | |
2169 | struct inode *inode = dqopt->files[type]; | |
2170 | ||
2171 | if (!inode) | |
2172 | return; | |
2173 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2174 | inode_lock(inode); | |
2175 | inode->i_flags &= ~S_NOQUOTA; | |
2176 | inode_unlock(inode); | |
2177 | } | |
2178 | dqopt->files[type] = NULL; | |
2179 | iput(inode); | |
2180 | } | |
2181 | ||
1da177e4 LT |
2182 | /* |
2183 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2184 | */ | |
0f0dd62f | 2185 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2186 | { |
2ec1f301 | 2187 | int cnt; |
1da177e4 | 2188 | struct quota_info *dqopt = sb_dqopt(sb); |
1da177e4 | 2189 | |
7d6cd73d JK |
2190 | /* s_umount should be held in exclusive mode */ |
2191 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2192 | up_read(&sb->s_umount); | |
2193 | ||
f55abc0f JK |
2194 | /* Cannot turn off usage accounting without turning off limits, or |
2195 | * suspend quotas and simultaneously turn quotas off. */ | |
2196 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2197 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2198 | DQUOT_USAGE_ENABLED))) | |
2199 | return -EINVAL; | |
2200 | ||
9377abd0 JK |
2201 | /* |
2202 | * Skip everything if there's nothing to do. We have to do this because | |
2203 | * sometimes we are called when fill_super() failed and calling | |
2204 | * sync_fs() in such cases does no good. | |
2205 | */ | |
c3b00446 | 2206 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2207 | return 0; |
c3b00446 | 2208 | |
1da177e4 | 2209 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1da177e4 LT |
2210 | if (type != -1 && cnt != type) |
2211 | continue; | |
f55abc0f | 2212 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2213 | continue; |
f55abc0f JK |
2214 | |
2215 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2216 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2217 | dqopt->flags |= |
2218 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2219 | spin_unlock(&dq_state_lock); |
f55abc0f | 2220 | } else { |
cc33412f | 2221 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2222 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2223 | /* Turning off suspended quotas? */ | |
2224 | if (!sb_has_quota_loaded(sb, cnt) && | |
2225 | sb_has_quota_suspended(sb, cnt)) { | |
2226 | dqopt->flags &= ~dquot_state_flag( | |
2227 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2228 | spin_unlock(&dq_state_lock); |
2ec1f301 | 2229 | vfs_cleanup_quota_inode(sb, cnt); |
f55abc0f JK |
2230 | continue; |
2231 | } | |
cc33412f | 2232 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2233 | } |
f55abc0f JK |
2234 | |
2235 | /* We still have to keep quota loaded? */ | |
2236 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2237 | continue; |
1da177e4 LT |
2238 | |
2239 | /* Note: these are blocking operations */ | |
2240 | drop_dquot_ref(sb, cnt); | |
2241 | invalidate_dquots(sb, cnt); | |
2242 | /* | |
268157ba JK |
2243 | * Now all dquots should be invalidated, all writes done so we |
2244 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2245 | */ |
2246 | if (info_dirty(&dqopt->info[cnt])) | |
2247 | sb->dq_op->write_info(sb, cnt); | |
2248 | if (dqopt->ops[cnt]->free_file_info) | |
2249 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2250 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1da177e4 LT |
2251 | dqopt->info[cnt].dqi_flags = 0; |
2252 | dqopt->info[cnt].dqi_igrace = 0; | |
2253 | dqopt->info[cnt].dqi_bgrace = 0; | |
2254 | dqopt->ops[cnt] = NULL; | |
2255 | } | |
ca785ec6 JK |
2256 | |
2257 | /* Skip syncing and setting flags if quota files are hidden */ | |
2258 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2259 | goto put_inodes; | |
2260 | ||
1da177e4 | 2261 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2262 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2263 | if (sb->s_op->sync_fs) |
2264 | sb->s_op->sync_fs(sb, 1); | |
2265 | sync_blockdev(sb->s_bdev); | |
2266 | /* Now the quota files are just ordinary files and we can set the | |
2267 | * inode flags back. Moreover we discard the pagecache so that | |
2268 | * userspace sees the writes we did bypassing the pagecache. We | |
2269 | * must also discard the blockdev buffers so that we see the | |
2270 | * changes done by userspace on the next quotaon() */ | |
2271 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2ec1f301 JK |
2272 | if (!sb_has_quota_loaded(sb, cnt) && dqopt->files[cnt]) { |
2273 | inode_lock(dqopt->files[cnt]); | |
2274 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); | |
2275 | inode_unlock(dqopt->files[cnt]); | |
ca785ec6 JK |
2276 | } |
2277 | if (sb->s_bdev) | |
2278 | invalidate_bdev(sb->s_bdev); | |
2279 | put_inodes: | |
2ec1f301 JK |
2280 | /* We are done when suspending quotas */ |
2281 | if (flags & DQUOT_SUSPENDED) | |
2282 | return 0; | |
2283 | ||
ca785ec6 | 2284 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
2ec1f301 JK |
2285 | if (!sb_has_quota_loaded(sb, cnt)) |
2286 | vfs_cleanup_quota_inode(sb, cnt); | |
2287 | return 0; | |
1da177e4 | 2288 | } |
0f0dd62f | 2289 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2290 | |
287a8095 | 2291 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2292 | { |
0f0dd62f CH |
2293 | return dquot_disable(sb, type, |
2294 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2295 | } |
287a8095 | 2296 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2297 | |
1da177e4 LT |
2298 | /* |
2299 | * Turn quotas on on a device | |
2300 | */ | |
2301 | ||
c7d3d283 JK |
2302 | static int vfs_setup_quota_inode(struct inode *inode, int type) |
2303 | { | |
2304 | struct super_block *sb = inode->i_sb; | |
2305 | struct quota_info *dqopt = sb_dqopt(sb); | |
2306 | ||
2307 | if (!S_ISREG(inode->i_mode)) | |
2308 | return -EACCES; | |
2309 | if (IS_RDONLY(inode)) | |
2310 | return -EROFS; | |
2311 | if (sb_has_quota_loaded(sb, type)) | |
2312 | return -EBUSY; | |
2313 | ||
2314 | dqopt->files[type] = igrab(inode); | |
2315 | if (!dqopt->files[type]) | |
2316 | return -EIO; | |
2317 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2318 | /* We don't want quota and atime on quota files (deadlocks | |
2319 | * possible) Also nobody should write to the file - we use | |
2320 | * special IO operations which ignore the immutable bit. */ | |
2321 | inode_lock(inode); | |
2322 | inode->i_flags |= S_NOQUOTA; | |
2323 | inode_unlock(inode); | |
2324 | /* | |
2325 | * When S_NOQUOTA is set, remove dquot references as no more | |
2326 | * references can be added | |
2327 | */ | |
2328 | __dquot_drop(inode); | |
2329 | } | |
2330 | return 0; | |
2331 | } | |
2332 | ||
c7d3d283 | 2333 | int dquot_load_quota_sb(struct super_block *sb, int type, int format_id, |
f55abc0f | 2334 | unsigned int flags) |
1da177e4 LT |
2335 | { |
2336 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1da177e4 LT |
2337 | struct quota_info *dqopt = sb_dqopt(sb); |
2338 | int error; | |
1da177e4 | 2339 | |
dc19432a JK |
2340 | /* Just unsuspend quotas? */ |
2341 | BUG_ON(flags & DQUOT_SUSPENDED); | |
2342 | /* s_umount should be held in exclusive mode */ | |
2343 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2344 | up_read(&sb->s_umount); | |
2345 | ||
1da177e4 LT |
2346 | if (!fmt) |
2347 | return -ESRCH; | |
847aac64 LX |
2348 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2349 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2350 | error = -EINVAL; |
2351 | goto out_fmt; | |
2352 | } | |
5c004828 EB |
2353 | /* Filesystems outside of init_user_ns not yet supported */ |
2354 | if (sb->s_user_ns != &init_user_ns) { | |
2355 | error = -EINVAL; | |
2356 | goto out_fmt; | |
2357 | } | |
f55abc0f JK |
2358 | /* Usage always has to be set... */ |
2359 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2360 | error = -EINVAL; | |
2361 | goto out_fmt; | |
2362 | } | |
c3b00446 JK |
2363 | if (sb_has_quota_loaded(sb, type)) { |
2364 | error = -EBUSY; | |
2365 | goto out_fmt; | |
2366 | } | |
1da177e4 | 2367 | |
ca785ec6 | 2368 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2369 | /* As we bypass the pagecache we must now flush all the |
2370 | * dirty data and invalidate caches so that kernel sees | |
2371 | * changes from userspace. It is not enough to just flush | |
2372 | * the quota file since if blocksize < pagesize, invalidation | |
2373 | * of the cache could fail because of other unrelated dirty | |
2374 | * data */ | |
2375 | sync_filesystem(sb); | |
ca785ec6 JK |
2376 | invalidate_bdev(sb->s_bdev); |
2377 | } | |
ca785ec6 | 2378 | |
1da177e4 LT |
2379 | error = -EINVAL; |
2380 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
c7d3d283 | 2381 | goto out_fmt; |
1da177e4 LT |
2382 | |
2383 | dqopt->ops[type] = fmt->qf_ops; | |
2384 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2385 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2386 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
268157ba | 2387 | error = dqopt->ops[type]->read_file_info(sb, type); |
42fdb858 | 2388 | if (error < 0) |
c7d3d283 | 2389 | goto out_fmt; |
15512377 JK |
2390 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { |
2391 | spin_lock(&dq_data_lock); | |
46fe44ce | 2392 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; |
15512377 JK |
2393 | spin_unlock(&dq_data_lock); |
2394 | } | |
cc33412f | 2395 | spin_lock(&dq_state_lock); |
f55abc0f | 2396 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2397 | spin_unlock(&dq_state_lock); |
1da177e4 | 2398 | |
1a6152d3 CY |
2399 | error = add_dquot_ref(sb, type); |
2400 | if (error) | |
2401 | dquot_disable(sb, type, flags); | |
1da177e4 | 2402 | |
1a6152d3 | 2403 | return error; |
1da177e4 LT |
2404 | out_fmt: |
2405 | put_quota_format(fmt); | |
2406 | ||
27942ef5 | 2407 | return error; |
1da177e4 | 2408 | } |
c7d3d283 JK |
2409 | EXPORT_SYMBOL(dquot_load_quota_sb); |
2410 | ||
2411 | /* | |
dc19432a JK |
2412 | * More powerful function for turning on quotas on given quota inode allowing |
2413 | * setting of individual quota flags | |
c7d3d283 | 2414 | */ |
dc19432a | 2415 | int dquot_load_quota_inode(struct inode *inode, int type, int format_id, |
c7d3d283 JK |
2416 | unsigned int flags) |
2417 | { | |
2418 | int err; | |
2419 | ||
2420 | err = vfs_setup_quota_inode(inode, type); | |
2421 | if (err < 0) | |
2422 | return err; | |
2423 | err = dquot_load_quota_sb(inode->i_sb, type, format_id, flags); | |
2424 | if (err < 0) | |
2425 | vfs_cleanup_quota_inode(inode->i_sb, type); | |
2426 | return err; | |
2427 | } | |
dc19432a | 2428 | EXPORT_SYMBOL(dquot_load_quota_inode); |
1da177e4 | 2429 | |
0ff5af83 | 2430 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2431 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2432 | { |
2433 | struct quota_info *dqopt = sb_dqopt(sb); | |
0f0dd62f | 2434 | int ret = 0, cnt; |
f55abc0f | 2435 | unsigned int flags; |
0ff5af83 | 2436 | |
7d6cd73d JK |
2437 | /* s_umount should be held in exclusive mode */ |
2438 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2439 | up_read(&sb->s_umount); | |
2440 | ||
0f0dd62f CH |
2441 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2442 | if (type != -1 && cnt != type) | |
2443 | continue; | |
c3b00446 | 2444 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2445 | continue; |
c3b00446 | 2446 | |
0f0dd62f CH |
2447 | spin_lock(&dq_state_lock); |
2448 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2449 | DQUOT_LIMITS_ENABLED, | |
2450 | cnt); | |
2451 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2452 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2453 | |
0f0dd62f | 2454 | flags = dquot_generic_flag(flags, cnt); |
ae45f07d JK |
2455 | ret = dquot_load_quota_sb(sb, cnt, dqopt->info[cnt].dqi_fmt_id, |
2456 | flags); | |
2457 | if (ret < 0) | |
2458 | vfs_cleanup_quota_inode(sb, type); | |
0f0dd62f | 2459 | } |
0ff5af83 JK |
2460 | |
2461 | return ret; | |
2462 | } | |
0f0dd62f | 2463 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2464 | |
f00c9e44 | 2465 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2466 | const struct path *path) |
77e69dac AV |
2467 | { |
2468 | int error = security_quota_on(path->dentry); | |
2469 | if (error) | |
2470 | return error; | |
2471 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2472 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2473 | error = -EXDEV; |
2474 | else | |
dc19432a | 2475 | error = dquot_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2476 | format_id, DQUOT_USAGE_ENABLED | |
2477 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2478 | return error; |
2479 | } | |
287a8095 | 2480 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 LT |
2481 | |
2482 | /* | |
2483 | * This function is used when filesystem needs to initialize quotas | |
2484 | * during mount time. | |
2485 | */ | |
287a8095 | 2486 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2487 | int format_id, int type) |
1da177e4 | 2488 | { |
84de856e | 2489 | struct dentry *dentry; |
1da177e4 LT |
2490 | int error; |
2491 | ||
6c2d4798 | 2492 | dentry = lookup_positive_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2493 | if (IS_ERR(dentry)) |
2494 | return PTR_ERR(dentry); | |
2495 | ||
1da177e4 | 2496 | error = security_quota_on(dentry); |
84de856e | 2497 | if (!error) |
dc19432a | 2498 | error = dquot_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2499 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2500 | |
84de856e CH |
2501 | dput(dentry); |
2502 | return error; | |
1da177e4 | 2503 | } |
287a8095 | 2504 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2505 | |
3e2af67e JK |
2506 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2507 | { | |
2508 | int ret; | |
2509 | int type; | |
2510 | struct quota_info *dqopt = sb_dqopt(sb); | |
2511 | ||
2512 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2513 | return -ENOSYS; | |
2514 | /* Accounting cannot be turned on while fs is mounted */ | |
2515 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2516 | if (!flags) | |
2517 | return -EINVAL; | |
2518 | for (type = 0; type < MAXQUOTAS; type++) { | |
2519 | if (!(flags & qtype_enforce_flag(type))) | |
2520 | continue; | |
2521 | /* Can't enforce without accounting */ | |
069a9166 JK |
2522 | if (!sb_has_quota_usage_enabled(sb, type)) { |
2523 | ret = -EINVAL; | |
2524 | goto out_err; | |
2525 | } | |
2526 | if (sb_has_quota_limits_enabled(sb, type)) { | |
2527 | ret = -EBUSY; | |
3e2af67e | 2528 | goto out_err; |
069a9166 JK |
2529 | } |
2530 | spin_lock(&dq_state_lock); | |
2531 | dqopt->flags |= dquot_state_flag(DQUOT_LIMITS_ENABLED, type); | |
2532 | spin_unlock(&dq_state_lock); | |
3e2af67e JK |
2533 | } |
2534 | return 0; | |
2535 | out_err: | |
2536 | /* Backout enforcement enablement we already did */ | |
2537 | for (type--; type >= 0; type--) { | |
2538 | if (flags & qtype_enforce_flag(type)) | |
2539 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2540 | } | |
2541 | /* Error code translation for better compatibility with XFS */ | |
2542 | if (ret == -EBUSY) | |
2543 | ret = -EEXIST; | |
2544 | return ret; | |
2545 | } | |
2546 | ||
2547 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2548 | { | |
2549 | int ret; | |
2550 | int type; | |
2551 | struct quota_info *dqopt = sb_dqopt(sb); | |
2552 | ||
2553 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2554 | return -ENOSYS; | |
2555 | /* | |
2556 | * We don't support turning off accounting via quotactl. In principle | |
2557 | * quota infrastructure can do this but filesystems don't expect | |
2558 | * userspace to be able to do it. | |
2559 | */ | |
2560 | if (flags & | |
2561 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2562 | return -EOPNOTSUPP; | |
2563 | ||
2564 | /* Filter out limits not enabled */ | |
2565 | for (type = 0; type < MAXQUOTAS; type++) | |
2566 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2567 | flags &= ~qtype_enforce_flag(type); | |
2568 | /* Nothing left? */ | |
2569 | if (!flags) | |
2570 | return -EEXIST; | |
2571 | for (type = 0; type < MAXQUOTAS; type++) { | |
2572 | if (flags & qtype_enforce_flag(type)) { | |
2573 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2574 | if (ret < 0) | |
2575 | goto out_err; | |
2576 | } | |
2577 | } | |
2578 | return 0; | |
2579 | out_err: | |
2580 | /* Backout enforcement disabling we already did */ | |
2581 | for (type--; type >= 0; type--) { | |
069a9166 JK |
2582 | if (flags & qtype_enforce_flag(type)) { |
2583 | spin_lock(&dq_state_lock); | |
2584 | dqopt->flags |= | |
2585 | dquot_state_flag(DQUOT_LIMITS_ENABLED, type); | |
2586 | spin_unlock(&dq_state_lock); | |
2587 | } | |
3e2af67e JK |
2588 | } |
2589 | return ret; | |
2590 | } | |
2591 | ||
1da177e4 | 2592 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2593 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2594 | { |
2595 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2596 | ||
b9b2dd36 | 2597 | memset(di, 0, sizeof(*di)); |
7b9ca4c6 | 2598 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2599 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2600 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2601 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2602 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2603 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2604 | di->d_ino_count = dm->dqb_curinodes; | |
2605 | di->d_spc_timer = dm->dqb_btime; | |
2606 | di->d_ino_timer = dm->dqb_itime; | |
7b9ca4c6 | 2607 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 LT |
2608 | } |
2609 | ||
74a8a103 | 2610 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2611 | struct qc_dqblk *di) |
1da177e4 LT |
2612 | { |
2613 | struct dquot *dquot; | |
2614 | ||
aca645a6 | 2615 | dquot = dqget(sb, qid); |
6184fc0b JK |
2616 | if (IS_ERR(dquot)) |
2617 | return PTR_ERR(dquot); | |
1da177e4 LT |
2618 | do_get_dqblk(dquot, di); |
2619 | dqput(dquot); | |
cc33412f | 2620 | |
1da177e4 LT |
2621 | return 0; |
2622 | } | |
287a8095 | 2623 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2624 | |
be6257b2 JK |
2625 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2626 | struct qc_dqblk *di) | |
2627 | { | |
2628 | struct dquot *dquot; | |
2629 | int err; | |
2630 | ||
2631 | if (!sb->dq_op->get_next_id) | |
2632 | return -ENOSYS; | |
2633 | err = sb->dq_op->get_next_id(sb, qid); | |
2634 | if (err < 0) | |
2635 | return err; | |
2636 | dquot = dqget(sb, *qid); | |
2637 | if (IS_ERR(dquot)) | |
2638 | return PTR_ERR(dquot); | |
2639 | do_get_dqblk(dquot, di); | |
2640 | dqput(dquot); | |
2641 | ||
2642 | return 0; | |
2643 | } | |
2644 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2645 | ||
14bf61ff JK |
2646 | #define VFS_QC_MASK \ |
2647 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2648 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2649 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2650 | |
1da177e4 | 2651 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2652 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2653 | { |
2654 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2655 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2656 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2657 | |
14bf61ff | 2658 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2659 | return -EINVAL; |
2660 | ||
14bf61ff | 2661 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2662 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2663 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2664 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2665 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2666 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2667 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2668 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2669 | return -ERANGE; |
1da177e4 | 2670 | |
7b9ca4c6 | 2671 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2672 | if (di->d_fieldmask & QC_SPACE) { |
2673 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2674 | check_blim = 1; |
08261673 | 2675 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2676 | } |
c472b432 | 2677 | |
14bf61ff JK |
2678 | if (di->d_fieldmask & QC_SPC_SOFT) |
2679 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2680 | if (di->d_fieldmask & QC_SPC_HARD) | |
2681 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2682 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2683 | check_blim = 1; |
08261673 | 2684 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2685 | } |
c472b432 | 2686 | |
14bf61ff JK |
2687 | if (di->d_fieldmask & QC_INO_COUNT) { |
2688 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2689 | check_ilim = 1; |
08261673 | 2690 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2691 | } |
c472b432 | 2692 | |
14bf61ff | 2693 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2694 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2695 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2696 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2697 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2698 | check_ilim = 1; |
08261673 | 2699 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2700 | } |
c472b432 | 2701 | |
14bf61ff JK |
2702 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2703 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2704 | check_blim = 1; |
08261673 | 2705 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2706 | } |
c472b432 | 2707 | |
14bf61ff JK |
2708 | if (di->d_fieldmask & QC_INO_TIMER) { |
2709 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2710 | check_ilim = 1; |
08261673 | 2711 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2712 | } |
1da177e4 LT |
2713 | |
2714 | if (check_blim) { | |
268157ba | 2715 | if (!dm->dqb_bsoftlimit || |
4b8e1106 | 2716 | dm->dqb_curspace + dm->dqb_rsvspace <= dm->dqb_bsoftlimit) { |
1da177e4 LT |
2717 | dm->dqb_btime = 0; |
2718 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2719 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2720 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2721 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2722 | } |
2723 | if (check_ilim) { | |
268157ba | 2724 | if (!dm->dqb_isoftlimit || |
4b8e1106 | 2725 | dm->dqb_curinodes <= dm->dqb_isoftlimit) { |
1da177e4 LT |
2726 | dm->dqb_itime = 0; |
2727 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2728 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2729 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2730 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2731 | } |
268157ba JK |
2732 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2733 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2734 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2735 | else | |
2736 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
7b9ca4c6 | 2737 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 | 2738 | mark_dquot_dirty(dquot); |
338bf9af AP |
2739 | |
2740 | return 0; | |
1da177e4 LT |
2741 | } |
2742 | ||
74a8a103 | 2743 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2744 | struct qc_dqblk *di) |
1da177e4 LT |
2745 | { |
2746 | struct dquot *dquot; | |
338bf9af | 2747 | int rc; |
1da177e4 | 2748 | |
aca645a6 | 2749 | dquot = dqget(sb, qid); |
6184fc0b JK |
2750 | if (IS_ERR(dquot)) { |
2751 | rc = PTR_ERR(dquot); | |
f55abc0f | 2752 | goto out; |
1da177e4 | 2753 | } |
338bf9af | 2754 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2755 | dqput(dquot); |
f55abc0f | 2756 | out: |
338bf9af | 2757 | return rc; |
1da177e4 | 2758 | } |
287a8095 | 2759 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2760 | |
2761 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2762 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2763 | { |
2764 | struct mem_dqinfo *mi; | |
0a240339 JK |
2765 | struct qc_type_state *tstate; |
2766 | struct quota_info *dqopt = sb_dqopt(sb); | |
2767 | int type; | |
27942ef5 | 2768 | |
0a240339 JK |
2769 | memset(state, 0, sizeof(*state)); |
2770 | for (type = 0; type < MAXQUOTAS; type++) { | |
2771 | if (!sb_has_quota_active(sb, type)) | |
2772 | continue; | |
2773 | tstate = state->s_state + type; | |
2774 | mi = sb_dqopt(sb)->info + type; | |
2775 | tstate->flags = QCI_ACCT_ENABLED; | |
2776 | spin_lock(&dq_data_lock); | |
2777 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2778 | tstate->flags |= QCI_SYSFILE; | |
2779 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2780 | tstate->flags |= QCI_ROOT_SQUASH; | |
2781 | if (sb_has_quota_limits_enabled(sb, type)) | |
2782 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2783 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2784 | tstate->ino_timelimit = mi->dqi_igrace; | |
a0828b6c JK |
2785 | if (dqopt->files[type]) { |
2786 | tstate->ino = dqopt->files[type]->i_ino; | |
2787 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2788 | } | |
0a240339 JK |
2789 | tstate->nextents = 1; /* We don't know... */ |
2790 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2791 | } |
1da177e4 LT |
2792 | return 0; |
2793 | } | |
0a240339 | 2794 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2795 | |
2796 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2797 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2798 | { |
2799 | struct mem_dqinfo *mi; | |
f55abc0f | 2800 | int err = 0; |
1da177e4 | 2801 | |
5eacb2ac JK |
2802 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2803 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2804 | return -EINVAL; | |
9d1ccbe7 JK |
2805 | if (!sb_has_quota_active(sb, type)) |
2806 | return -ESRCH; | |
1da177e4 | 2807 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2808 | if (ii->i_fieldmask & QC_FLAGS) { |
2809 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2810 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2811 | return -EINVAL; | |
ca6cb091 | 2812 | } |
1da177e4 | 2813 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2814 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2815 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2816 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2817 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2818 | if (ii->i_fieldmask & QC_FLAGS) { | |
2819 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2820 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2821 | else | |
2822 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2823 | } | |
1da177e4 LT |
2824 | spin_unlock(&dq_data_lock); |
2825 | mark_info_dirty(sb, type); | |
2826 | /* Force write to disk */ | |
2827 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2828 | return err; |
1da177e4 | 2829 | } |
287a8095 | 2830 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2831 | |
3e2af67e JK |
2832 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2833 | .quota_enable = dquot_quota_enable, | |
2834 | .quota_disable = dquot_quota_disable, | |
2835 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2836 | .get_state = dquot_get_state, |
3e2af67e JK |
2837 | .set_info = dquot_set_dqinfo, |
2838 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2839 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2840 | .set_dqblk = dquot_set_dqblk |
2841 | }; | |
2842 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2843 | ||
dde95888 | 2844 | static int do_proc_dqstats(struct ctl_table *table, int write, |
32927393 | 2845 | void *buffer, size_t *lenp, loff_t *ppos) |
dde95888 | 2846 | { |
6fcbcec9 KK |
2847 | unsigned int type = (unsigned long *)table->data - dqstats.stat; |
2848 | s64 value = percpu_counter_sum(&dqstats.counter[type]); | |
2849 | ||
2850 | /* Filter negative values for non-monotonic counters */ | |
2851 | if (value < 0 && (type == DQST_ALLOC_DQUOTS || | |
2852 | type == DQST_FREE_DQUOTS)) | |
2853 | value = 0; | |
f32764bd DM |
2854 | |
2855 | /* Update global table */ | |
6fcbcec9 KK |
2856 | dqstats.stat[type] = value; |
2857 | return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); | |
dde95888 DM |
2858 | } |
2859 | ||
e628753b | 2860 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2861 | { |
1da177e4 | 2862 | .procname = "lookups", |
dde95888 | 2863 | .data = &dqstats.stat[DQST_LOOKUPS], |
6fcbcec9 | 2864 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2865 | .mode = 0444, |
dde95888 | 2866 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2867 | }, |
2868 | { | |
1da177e4 | 2869 | .procname = "drops", |
dde95888 | 2870 | .data = &dqstats.stat[DQST_DROPS], |
6fcbcec9 | 2871 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2872 | .mode = 0444, |
dde95888 | 2873 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2874 | }, |
2875 | { | |
1da177e4 | 2876 | .procname = "reads", |
dde95888 | 2877 | .data = &dqstats.stat[DQST_READS], |
6fcbcec9 | 2878 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2879 | .mode = 0444, |
dde95888 | 2880 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2881 | }, |
2882 | { | |
1da177e4 | 2883 | .procname = "writes", |
dde95888 | 2884 | .data = &dqstats.stat[DQST_WRITES], |
6fcbcec9 | 2885 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2886 | .mode = 0444, |
dde95888 | 2887 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2888 | }, |
2889 | { | |
1da177e4 | 2890 | .procname = "cache_hits", |
dde95888 | 2891 | .data = &dqstats.stat[DQST_CACHE_HITS], |
6fcbcec9 | 2892 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2893 | .mode = 0444, |
dde95888 | 2894 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2895 | }, |
2896 | { | |
1da177e4 | 2897 | .procname = "allocated_dquots", |
dde95888 | 2898 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
6fcbcec9 | 2899 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2900 | .mode = 0444, |
dde95888 | 2901 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2902 | }, |
2903 | { | |
1da177e4 | 2904 | .procname = "free_dquots", |
dde95888 | 2905 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
6fcbcec9 | 2906 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2907 | .mode = 0444, |
dde95888 | 2908 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2909 | }, |
2910 | { | |
1da177e4 | 2911 | .procname = "syncs", |
dde95888 | 2912 | .data = &dqstats.stat[DQST_SYNCS], |
6fcbcec9 | 2913 | .maxlen = sizeof(unsigned long), |
1da177e4 | 2914 | .mode = 0444, |
dde95888 | 2915 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2916 | }, |
8e893469 | 2917 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2918 | { |
1da177e4 LT |
2919 | .procname = "warnings", |
2920 | .data = &flag_print_warnings, | |
2921 | .maxlen = sizeof(int), | |
2922 | .mode = 0644, | |
6d456111 | 2923 | .proc_handler = proc_dointvec, |
1da177e4 | 2924 | }, |
8e893469 | 2925 | #endif |
ab09203e | 2926 | { }, |
1da177e4 LT |
2927 | }; |
2928 | ||
e628753b | 2929 | static struct ctl_table fs_table[] = { |
1da177e4 | 2930 | { |
1da177e4 LT |
2931 | .procname = "quota", |
2932 | .mode = 0555, | |
2933 | .child = fs_dqstats_table, | |
2934 | }, | |
ab09203e | 2935 | { }, |
1da177e4 LT |
2936 | }; |
2937 | ||
e628753b | 2938 | static struct ctl_table sys_table[] = { |
1da177e4 | 2939 | { |
1da177e4 LT |
2940 | .procname = "fs", |
2941 | .mode = 0555, | |
2942 | .child = fs_table, | |
2943 | }, | |
ab09203e | 2944 | { }, |
1da177e4 LT |
2945 | }; |
2946 | ||
2947 | static int __init dquot_init(void) | |
2948 | { | |
f32764bd | 2949 | int i, ret; |
1da177e4 LT |
2950 | unsigned long nr_hash, order; |
2951 | ||
2952 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2953 | ||
0b4d4147 | 2954 | register_sysctl_table(sys_table); |
1da177e4 | 2955 | |
20c2df83 | 2956 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2957 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2958 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2959 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2960 | NULL); |
1da177e4 LT |
2961 | |
2962 | order = 0; | |
1aa3b3e0 | 2963 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); |
1da177e4 LT |
2964 | if (!dquot_hash) |
2965 | panic("Cannot create dquot hash table"); | |
2966 | ||
f32764bd | 2967 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2968 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2969 | if (ret) |
2970 | panic("Cannot create dquot stat counters"); | |
2971 | } | |
dde95888 | 2972 | |
1da177e4 LT |
2973 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2974 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
24fc755f | 2975 | dq_hash_bits = ilog2(nr_hash); |
1da177e4 LT |
2976 | |
2977 | nr_hash = 1UL << dq_hash_bits; | |
2978 | dq_hash_mask = nr_hash - 1; | |
2979 | for (i = 0; i < nr_hash; i++) | |
2980 | INIT_HLIST_HEAD(dquot_hash + i); | |
2981 | ||
19858e7b AB |
2982 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2983 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2984 | |
88bc0ede TH |
2985 | if (register_shrinker(&dqcache_shrinker)) |
2986 | panic("Cannot register dquot shrinker"); | |
1da177e4 LT |
2987 | |
2988 | return 0; | |
2989 | } | |
331221fa | 2990 | fs_initcall(dquot_init); |