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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
74 | #include <linux/kmod.h> | |
75 | #include <linux/namei.h> | |
76 | #include <linux/buffer_head.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
fb58b731 | 79 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
1da177e4 LT |
80 | |
81 | #include <asm/uaccess.h> | |
82 | ||
1da177e4 | 83 | /* |
cc33412f | 84 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
dde95888 | 85 | * and quota formats. |
cc33412f JK |
86 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and |
87 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 88 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
89 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
90 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
91 | * about latest values take it as well. | |
1da177e4 | 92 | * |
cc33412f JK |
93 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
94 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
95 | * |
96 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
97 | * the life of the dquot structure and so needn't to be protected by a lock | |
98 | * | |
99 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
100 | * operation is just reading pointers from inode (or not using them at all) the | |
26245c94 JK |
101 | * read lock is enough. If pointers are altered function must hold write lock. |
102 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that | |
103 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
104 | * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they | |
105 | * have to do all pointer modifications before dropping dqptr_sem. This makes | |
106 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and | |
107 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 108 | * |
d3be915f | 109 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
110 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
111 | * Currently dquot is locked only when it is being read to memory (or space for | |
112 | * it is being allocated) on the first dqget() and when it is being released on | |
113 | * the last dqput(). The allocation and release oparations are serialized by | |
114 | * the dq_lock and by checking the use count in dquot_release(). Write | |
115 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
116 | * spinlock to internal buffers before writing. | |
117 | * | |
118 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
119 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
120 | * dqio_mutex | |
cc33412f JK |
121 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
122 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
123 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
124 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
125 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
126 | * called with dqptr_sem held. | |
d3be915f | 127 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
128 | */ |
129 | ||
c516610c JK |
130 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
131 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
132 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 133 | EXPORT_SYMBOL(dq_data_lock); |
1da177e4 | 134 | |
da8d1ba2 | 135 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 136 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 137 | #endif |
1da177e4 LT |
138 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
139 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
140 | ||
141 | /* SLAB cache for dquot structures */ | |
e18b890b | 142 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
143 | |
144 | int register_quota_format(struct quota_format_type *fmt) | |
145 | { | |
146 | spin_lock(&dq_list_lock); | |
147 | fmt->qf_next = quota_formats; | |
148 | quota_formats = fmt; | |
149 | spin_unlock(&dq_list_lock); | |
150 | return 0; | |
151 | } | |
08d0350c | 152 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
153 | |
154 | void unregister_quota_format(struct quota_format_type *fmt) | |
155 | { | |
156 | struct quota_format_type **actqf; | |
157 | ||
158 | spin_lock(&dq_list_lock); | |
268157ba JK |
159 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
160 | actqf = &(*actqf)->qf_next) | |
161 | ; | |
1da177e4 LT |
162 | if (*actqf) |
163 | *actqf = (*actqf)->qf_next; | |
164 | spin_unlock(&dq_list_lock); | |
165 | } | |
08d0350c | 166 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
167 | |
168 | static struct quota_format_type *find_quota_format(int id) | |
169 | { | |
170 | struct quota_format_type *actqf; | |
171 | ||
172 | spin_lock(&dq_list_lock); | |
268157ba JK |
173 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
174 | actqf = actqf->qf_next) | |
175 | ; | |
1da177e4 LT |
176 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
177 | int qm; | |
178 | ||
179 | spin_unlock(&dq_list_lock); | |
180 | ||
268157ba JK |
181 | for (qm = 0; module_names[qm].qm_fmt_id && |
182 | module_names[qm].qm_fmt_id != id; qm++) | |
183 | ; | |
184 | if (!module_names[qm].qm_fmt_id || | |
185 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
186 | return NULL; |
187 | ||
188 | spin_lock(&dq_list_lock); | |
268157ba JK |
189 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
190 | actqf = actqf->qf_next) | |
191 | ; | |
1da177e4 LT |
192 | if (actqf && !try_module_get(actqf->qf_owner)) |
193 | actqf = NULL; | |
194 | } | |
195 | spin_unlock(&dq_list_lock); | |
196 | return actqf; | |
197 | } | |
198 | ||
199 | static void put_quota_format(struct quota_format_type *fmt) | |
200 | { | |
201 | module_put(fmt->qf_owner); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Dquot List Management: | |
206 | * The quota code uses three lists for dquot management: the inuse_list, | |
207 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
208 | * on all three lists, depending on its current state. | |
209 | * | |
210 | * All dquots are placed to the end of inuse_list when first created, and this | |
211 | * list is used for invalidate operation, which must look at every dquot. | |
212 | * | |
213 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
214 | * and this list is searched whenever we need an available dquot. Dquots are | |
215 | * removed from the list as soon as they are used again, and | |
216 | * dqstats.free_dquots gives the number of dquots on the list. When | |
217 | * dquot is invalidated it's completely released from memory. | |
218 | * | |
219 | * Dquots with a specific identity (device, type and id) are placed on | |
220 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
221 | * mechanism to locate a specific dquot. | |
222 | */ | |
223 | ||
224 | static LIST_HEAD(inuse_list); | |
225 | static LIST_HEAD(free_dquots); | |
226 | static unsigned int dq_hash_bits, dq_hash_mask; | |
227 | static struct hlist_head *dquot_hash; | |
228 | ||
229 | struct dqstats dqstats; | |
08d0350c | 230 | EXPORT_SYMBOL(dqstats); |
dde95888 DM |
231 | #ifdef CONFIG_SMP |
232 | struct dqstats *dqstats_pcpu; | |
233 | EXPORT_SYMBOL(dqstats_pcpu); | |
234 | #endif | |
1da177e4 | 235 | |
0a5a9c72 | 236 | static qsize_t inode_get_rsv_space(struct inode *inode); |
871a2931 | 237 | static void __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 238 | |
1da177e4 LT |
239 | static inline unsigned int |
240 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
241 | { | |
242 | unsigned long tmp; | |
243 | ||
244 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
245 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Following list functions expect dq_list_lock to be held | |
250 | */ | |
251 | static inline void insert_dquot_hash(struct dquot *dquot) | |
252 | { | |
268157ba JK |
253 | struct hlist_head *head; |
254 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
1da177e4 LT |
255 | hlist_add_head(&dquot->dq_hash, head); |
256 | } | |
257 | ||
258 | static inline void remove_dquot_hash(struct dquot *dquot) | |
259 | { | |
260 | hlist_del_init(&dquot->dq_hash); | |
261 | } | |
262 | ||
7a2435d8 JK |
263 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
264 | unsigned int id, int type) | |
1da177e4 LT |
265 | { |
266 | struct hlist_node *node; | |
267 | struct dquot *dquot; | |
268 | ||
269 | hlist_for_each (node, dquot_hash+hashent) { | |
270 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
268157ba JK |
271 | if (dquot->dq_sb == sb && dquot->dq_id == id && |
272 | dquot->dq_type == type) | |
1da177e4 LT |
273 | return dquot; |
274 | } | |
dd6f3c6d | 275 | return NULL; |
1da177e4 LT |
276 | } |
277 | ||
278 | /* Add a dquot to the tail of the free list */ | |
279 | static inline void put_dquot_last(struct dquot *dquot) | |
280 | { | |
8e13059a | 281 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 282 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
283 | } |
284 | ||
285 | static inline void remove_free_dquot(struct dquot *dquot) | |
286 | { | |
287 | if (list_empty(&dquot->dq_free)) | |
288 | return; | |
289 | list_del_init(&dquot->dq_free); | |
dde95888 | 290 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
291 | } |
292 | ||
293 | static inline void put_inuse(struct dquot *dquot) | |
294 | { | |
295 | /* We add to the back of inuse list so we don't have to restart | |
296 | * when traversing this list and we block */ | |
8e13059a | 297 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 298 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
299 | } |
300 | ||
301 | static inline void remove_inuse(struct dquot *dquot) | |
302 | { | |
dde95888 | 303 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
304 | list_del(&dquot->dq_inuse); |
305 | } | |
306 | /* | |
307 | * End of list functions needing dq_list_lock | |
308 | */ | |
309 | ||
310 | static void wait_on_dquot(struct dquot *dquot) | |
311 | { | |
d3be915f IM |
312 | mutex_lock(&dquot->dq_lock); |
313 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
314 | } |
315 | ||
03f6e92b JK |
316 | static inline int dquot_dirty(struct dquot *dquot) |
317 | { | |
318 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
319 | } | |
320 | ||
321 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
322 | { | |
323 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
324 | } | |
1da177e4 | 325 | |
eabf290d | 326 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
327 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
328 | { | |
eabf290d DM |
329 | int ret = 1; |
330 | ||
331 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ | |
332 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
333 | return 1; | |
334 | ||
1da177e4 | 335 | spin_lock(&dq_list_lock); |
eabf290d | 336 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 LT |
337 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
338 | info[dquot->dq_type].dqi_dirty_list); | |
eabf290d DM |
339 | ret = 0; |
340 | } | |
1da177e4 | 341 | spin_unlock(&dq_list_lock); |
eabf290d | 342 | return ret; |
1da177e4 | 343 | } |
08d0350c | 344 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 345 | |
dc52dd3a DM |
346 | /* Dirtify all the dquots - this can block when journalling */ |
347 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
348 | { | |
349 | int ret, err, cnt; | |
350 | ||
351 | ret = err = 0; | |
352 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
353 | if (dquot[cnt]) | |
354 | /* Even in case of error we have to continue */ | |
355 | ret = mark_dquot_dirty(dquot[cnt]); | |
356 | if (!err) | |
357 | err = ret; | |
358 | } | |
359 | return err; | |
360 | } | |
361 | ||
362 | static inline void dqput_all(struct dquot **dquot) | |
363 | { | |
364 | unsigned int cnt; | |
365 | ||
366 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
367 | dqput(dquot[cnt]); | |
368 | } | |
369 | ||
1da177e4 LT |
370 | /* This function needs dq_list_lock */ |
371 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
372 | { | |
373 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
374 | return 0; | |
375 | list_del_init(&dquot->dq_dirty); | |
376 | return 1; | |
377 | } | |
378 | ||
379 | void mark_info_dirty(struct super_block *sb, int type) | |
380 | { | |
381 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
382 | } | |
383 | EXPORT_SYMBOL(mark_info_dirty); | |
384 | ||
385 | /* | |
386 | * Read dquot from disk and alloc space for it | |
387 | */ | |
388 | ||
389 | int dquot_acquire(struct dquot *dquot) | |
390 | { | |
391 | int ret = 0, ret2 = 0; | |
392 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
393 | ||
d3be915f IM |
394 | mutex_lock(&dquot->dq_lock); |
395 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
396 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
397 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
398 | if (ret < 0) | |
399 | goto out_iolock; | |
400 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
401 | /* Instantiate dquot if needed */ | |
402 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
403 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
404 | /* Write the info if needed */ | |
268157ba JK |
405 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
406 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
407 | dquot->dq_sb, dquot->dq_type); | |
408 | } | |
1da177e4 LT |
409 | if (ret < 0) |
410 | goto out_iolock; | |
411 | if (ret2 < 0) { | |
412 | ret = ret2; | |
413 | goto out_iolock; | |
414 | } | |
415 | } | |
416 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
417 | out_iolock: | |
d3be915f IM |
418 | mutex_unlock(&dqopt->dqio_mutex); |
419 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
420 | return ret; |
421 | } | |
08d0350c | 422 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
423 | |
424 | /* | |
425 | * Write dquot to disk | |
426 | */ | |
427 | int dquot_commit(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(&dqopt->dqio_mutex); |
1da177e4 LT |
433 | spin_lock(&dq_list_lock); |
434 | if (!clear_dquot_dirty(dquot)) { | |
435 | spin_unlock(&dq_list_lock); | |
436 | goto out_sem; | |
437 | } | |
438 | spin_unlock(&dq_list_lock); | |
439 | /* Inactive dquot can be only if there was error during read/init | |
440 | * => we have better not writing it */ | |
441 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
442 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
268157ba JK |
443 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
444 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
445 | dquot->dq_sb, dquot->dq_type); | |
446 | } | |
1da177e4 LT |
447 | if (ret >= 0) |
448 | ret = ret2; | |
449 | } | |
450 | out_sem: | |
d3be915f | 451 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
452 | return ret; |
453 | } | |
08d0350c | 454 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
455 | |
456 | /* | |
457 | * Release dquot | |
458 | */ | |
459 | int dquot_release(struct dquot *dquot) | |
460 | { | |
461 | int ret = 0, ret2 = 0; | |
462 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
463 | ||
d3be915f | 464 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
465 | /* Check whether we are not racing with some other dqget() */ |
466 | if (atomic_read(&dquot->dq_count) > 1) | |
467 | goto out_dqlock; | |
d3be915f | 468 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
469 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
470 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
471 | /* Write the info */ | |
268157ba JK |
472 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
473 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
474 | dquot->dq_sb, dquot->dq_type); | |
475 | } | |
1da177e4 LT |
476 | if (ret >= 0) |
477 | ret = ret2; | |
478 | } | |
479 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 480 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 481 | out_dqlock: |
d3be915f | 482 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
483 | return ret; |
484 | } | |
08d0350c | 485 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 486 | |
7d9056ba | 487 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
488 | { |
489 | kmem_cache_free(dquot_cachep, dquot); | |
490 | } | |
7d9056ba | 491 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
492 | |
493 | static inline void do_destroy_dquot(struct dquot *dquot) | |
494 | { | |
495 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
496 | } | |
497 | ||
1da177e4 LT |
498 | /* Invalidate all dquots on the list. Note that this function is called after |
499 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
500 | * quota users. There can still be some users of quotas due to inodes being |
501 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 502 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 503 | */ |
1da177e4 LT |
504 | static void invalidate_dquots(struct super_block *sb, int type) |
505 | { | |
c33ed271 | 506 | struct dquot *dquot, *tmp; |
1da177e4 | 507 | |
6362e4d4 | 508 | restart: |
1da177e4 | 509 | spin_lock(&dq_list_lock); |
c33ed271 | 510 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
511 | if (dquot->dq_sb != sb) |
512 | continue; | |
513 | if (dquot->dq_type != type) | |
514 | continue; | |
6362e4d4 JK |
515 | /* Wait for dquot users */ |
516 | if (atomic_read(&dquot->dq_count)) { | |
517 | DEFINE_WAIT(wait); | |
518 | ||
519 | atomic_inc(&dquot->dq_count); | |
520 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
521 | TASK_UNINTERRUPTIBLE); | |
522 | spin_unlock(&dq_list_lock); | |
523 | /* Once dqput() wakes us up, we know it's time to free | |
524 | * the dquot. | |
525 | * IMPORTANT: we rely on the fact that there is always | |
526 | * at most one process waiting for dquot to free. | |
527 | * Otherwise dq_count would be > 1 and we would never | |
528 | * wake up. | |
529 | */ | |
530 | if (atomic_read(&dquot->dq_count) > 1) | |
531 | schedule(); | |
532 | finish_wait(&dquot->dq_wait_unused, &wait); | |
533 | dqput(dquot); | |
534 | /* At this moment dquot() need not exist (it could be | |
535 | * reclaimed by prune_dqcache(). Hence we must | |
536 | * restart. */ | |
537 | goto restart; | |
538 | } | |
539 | /* | |
540 | * Quota now has no users and it has been written on last | |
541 | * dqput() | |
542 | */ | |
1da177e4 LT |
543 | remove_dquot_hash(dquot); |
544 | remove_free_dquot(dquot); | |
545 | remove_inuse(dquot); | |
74f783af | 546 | do_destroy_dquot(dquot); |
1da177e4 LT |
547 | } |
548 | spin_unlock(&dq_list_lock); | |
549 | } | |
550 | ||
12c77527 JK |
551 | /* Call callback for every active dquot on given filesystem */ |
552 | int dquot_scan_active(struct super_block *sb, | |
553 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
554 | unsigned long priv) | |
555 | { | |
556 | struct dquot *dquot, *old_dquot = NULL; | |
557 | int ret = 0; | |
558 | ||
559 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
560 | spin_lock(&dq_list_lock); | |
561 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
562 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
563 | continue; | |
564 | if (dquot->dq_sb != sb) | |
565 | continue; | |
566 | /* Now we have active dquot so we can just increase use count */ | |
567 | atomic_inc(&dquot->dq_count); | |
12c77527 | 568 | spin_unlock(&dq_list_lock); |
dde95888 | 569 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
570 | dqput(old_dquot); |
571 | old_dquot = dquot; | |
572 | ret = fn(dquot, priv); | |
573 | if (ret < 0) | |
574 | goto out; | |
575 | spin_lock(&dq_list_lock); | |
576 | /* We are safe to continue now because our dquot could not | |
577 | * be moved out of the inuse list while we hold the reference */ | |
578 | } | |
579 | spin_unlock(&dq_list_lock); | |
580 | out: | |
581 | dqput(old_dquot); | |
582 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
583 | return ret; | |
584 | } | |
08d0350c | 585 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 586 | |
5fb324ad | 587 | int vfs_quota_sync(struct super_block *sb, int type, int wait) |
1da177e4 LT |
588 | { |
589 | struct list_head *dirty; | |
590 | struct dquot *dquot; | |
591 | struct quota_info *dqopt = sb_dqopt(sb); | |
592 | int cnt; | |
593 | ||
d3be915f | 594 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
595 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
596 | if (type != -1 && cnt != type) | |
597 | continue; | |
f55abc0f | 598 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
599 | continue; |
600 | spin_lock(&dq_list_lock); | |
601 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
602 | while (!list_empty(dirty)) { | |
268157ba JK |
603 | dquot = list_first_entry(dirty, struct dquot, |
604 | dq_dirty); | |
1da177e4 LT |
605 | /* Dirty and inactive can be only bad dquot... */ |
606 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
607 | clear_dquot_dirty(dquot); | |
608 | continue; | |
609 | } | |
610 | /* Now we have active dquot from which someone is | |
611 | * holding reference so we can safely just increase | |
612 | * use count */ | |
613 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 614 | spin_unlock(&dq_list_lock); |
dde95888 | 615 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
616 | sb->dq_op->write_dquot(dquot); |
617 | dqput(dquot); | |
618 | spin_lock(&dq_list_lock); | |
619 | } | |
620 | spin_unlock(&dq_list_lock); | |
621 | } | |
622 | ||
623 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
624 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
625 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 626 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 627 | dqstats_inc(DQST_SYNCS); |
d3be915f | 628 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 629 | |
5fb324ad CH |
630 | if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) |
631 | return 0; | |
632 | ||
633 | /* This is not very clever (and fast) but currently I don't know about | |
634 | * any other simple way of getting quota data to disk and we must get | |
635 | * them there for userspace to be visible... */ | |
636 | if (sb->s_op->sync_fs) | |
637 | sb->s_op->sync_fs(sb, 1); | |
638 | sync_blockdev(sb->s_bdev); | |
639 | ||
640 | /* | |
641 | * Now when everything is written we can discard the pagecache so | |
642 | * that userspace sees the changes. | |
643 | */ | |
644 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
645 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
646 | if (type != -1 && cnt != type) | |
647 | continue; | |
648 | if (!sb_has_quota_active(sb, cnt)) | |
649 | continue; | |
650 | mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, | |
651 | I_MUTEX_QUOTA); | |
652 | truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); | |
653 | mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); | |
654 | } | |
655 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
656 | ||
1da177e4 LT |
657 | return 0; |
658 | } | |
08d0350c | 659 | EXPORT_SYMBOL(vfs_quota_sync); |
1da177e4 LT |
660 | |
661 | /* Free unused dquots from cache */ | |
662 | static void prune_dqcache(int count) | |
663 | { | |
664 | struct list_head *head; | |
665 | struct dquot *dquot; | |
666 | ||
667 | head = free_dquots.prev; | |
668 | while (head != &free_dquots && count) { | |
669 | dquot = list_entry(head, struct dquot, dq_free); | |
670 | remove_dquot_hash(dquot); | |
671 | remove_free_dquot(dquot); | |
672 | remove_inuse(dquot); | |
74f783af | 673 | do_destroy_dquot(dquot); |
1da177e4 LT |
674 | count--; |
675 | head = free_dquots.prev; | |
676 | } | |
677 | } | |
678 | ||
dde95888 DM |
679 | static int dqstats_read(unsigned int type) |
680 | { | |
681 | int count = 0; | |
682 | #ifdef CONFIG_SMP | |
683 | int cpu; | |
684 | for_each_possible_cpu(cpu) | |
685 | count += per_cpu_ptr(dqstats_pcpu, cpu)->stat[type]; | |
686 | /* Statistics reading is racy, but absolute accuracy isn't required */ | |
687 | if (count < 0) | |
688 | count = 0; | |
689 | #else | |
690 | count = dqstats.stat[type]; | |
691 | #endif | |
692 | return count; | |
693 | } | |
694 | ||
1da177e4 LT |
695 | /* |
696 | * This is called from kswapd when we think we need some | |
697 | * more memory | |
698 | */ | |
699 | ||
27496a8c | 700 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
701 | { |
702 | if (nr) { | |
703 | spin_lock(&dq_list_lock); | |
704 | prune_dqcache(nr); | |
705 | spin_unlock(&dq_list_lock); | |
706 | } | |
dde95888 | 707 | return (dqstats_read(DQST_FREE_DQUOTS)/100) * sysctl_vfs_cache_pressure; |
1da177e4 LT |
708 | } |
709 | ||
8e1f936b RR |
710 | static struct shrinker dqcache_shrinker = { |
711 | .shrink = shrink_dqcache_memory, | |
712 | .seeks = DEFAULT_SEEKS, | |
713 | }; | |
714 | ||
1da177e4 LT |
715 | /* |
716 | * Put reference to dquot | |
717 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 718 | */ |
3d9ea253 | 719 | void dqput(struct dquot *dquot) |
1da177e4 | 720 | { |
b48d3805 JK |
721 | int ret; |
722 | ||
1da177e4 LT |
723 | if (!dquot) |
724 | return; | |
62af9b52 | 725 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 LT |
726 | if (!atomic_read(&dquot->dq_count)) { |
727 | printk("VFS: dqput: trying to free free dquot\n"); | |
728 | printk("VFS: device %s, dquot of %s %d\n", | |
729 | dquot->dq_sb->s_id, | |
730 | quotatypes[dquot->dq_type], | |
731 | dquot->dq_id); | |
732 | BUG(); | |
733 | } | |
734 | #endif | |
dde95888 | 735 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
736 | we_slept: |
737 | spin_lock(&dq_list_lock); | |
738 | if (atomic_read(&dquot->dq_count) > 1) { | |
739 | /* We have more than one user... nothing to do */ | |
740 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 741 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 742 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
743 | atomic_read(&dquot->dq_count) == 1) |
744 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
745 | spin_unlock(&dq_list_lock); |
746 | return; | |
747 | } | |
748 | /* Need to release dquot? */ | |
749 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
750 | spin_unlock(&dq_list_lock); | |
751 | /* Commit dquot before releasing */ | |
b48d3805 JK |
752 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
753 | if (ret < 0) { | |
754 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
755 | "device %s (error %d). Quota may get out of " | |
756 | "sync!\n", dquot->dq_sb->s_id, ret); | |
757 | /* | |
758 | * We clear dirty bit anyway, so that we avoid | |
759 | * infinite loop here | |
760 | */ | |
761 | spin_lock(&dq_list_lock); | |
762 | clear_dquot_dirty(dquot); | |
763 | spin_unlock(&dq_list_lock); | |
764 | } | |
1da177e4 LT |
765 | goto we_slept; |
766 | } | |
767 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
768 | clear_dquot_dirty(dquot); | |
769 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
770 | spin_unlock(&dq_list_lock); | |
771 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
772 | goto we_slept; | |
773 | } | |
774 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 775 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 776 | /* sanity check */ |
8abf6a47 | 777 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
778 | #endif |
779 | put_dquot_last(dquot); | |
780 | spin_unlock(&dq_list_lock); | |
781 | } | |
08d0350c | 782 | EXPORT_SYMBOL(dqput); |
1da177e4 | 783 | |
7d9056ba | 784 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
785 | { |
786 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
787 | } | |
7d9056ba | 788 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 789 | |
1da177e4 LT |
790 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
791 | { | |
792 | struct dquot *dquot; | |
793 | ||
74f783af | 794 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 795 | if(!dquot) |
dd6f3c6d | 796 | return NULL; |
1da177e4 | 797 | |
d3be915f | 798 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
799 | INIT_LIST_HEAD(&dquot->dq_free); |
800 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
801 | INIT_HLIST_NODE(&dquot->dq_hash); | |
802 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 803 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
804 | dquot->dq_sb = sb; |
805 | dquot->dq_type = type; | |
806 | atomic_set(&dquot->dq_count, 1); | |
807 | ||
808 | return dquot; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Get reference to dquot | |
cc33412f JK |
813 | * |
814 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
815 | * destroying our dquot by: | |
816 | * a) checking for quota flags under dq_list_lock and | |
817 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 818 | */ |
3d9ea253 | 819 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
820 | { |
821 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 822 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 823 | |
f55abc0f | 824 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 825 | return NULL; |
1da177e4 LT |
826 | we_slept: |
827 | spin_lock(&dq_list_lock); | |
cc33412f JK |
828 | spin_lock(&dq_state_lock); |
829 | if (!sb_has_quota_active(sb, type)) { | |
830 | spin_unlock(&dq_state_lock); | |
831 | spin_unlock(&dq_list_lock); | |
832 | goto out; | |
833 | } | |
834 | spin_unlock(&dq_state_lock); | |
835 | ||
dd6f3c6d JK |
836 | dquot = find_dquot(hashent, sb, id, type); |
837 | if (!dquot) { | |
838 | if (!empty) { | |
1da177e4 | 839 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
840 | empty = get_empty_dquot(sb, type); |
841 | if (!empty) | |
1da177e4 LT |
842 | schedule(); /* Try to wait for a moment... */ |
843 | goto we_slept; | |
844 | } | |
845 | dquot = empty; | |
dd6f3c6d | 846 | empty = NULL; |
1da177e4 LT |
847 | dquot->dq_id = id; |
848 | /* all dquots go on the inuse_list */ | |
849 | put_inuse(dquot); | |
850 | /* hash it first so it can be found */ | |
851 | insert_dquot_hash(dquot); | |
1da177e4 | 852 | spin_unlock(&dq_list_lock); |
dde95888 | 853 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
854 | } else { |
855 | if (!atomic_read(&dquot->dq_count)) | |
856 | remove_free_dquot(dquot); | |
857 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 858 | spin_unlock(&dq_list_lock); |
dde95888 DM |
859 | dqstats_inc(DQST_CACHE_HITS); |
860 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 861 | } |
268157ba JK |
862 | /* Wait for dq_lock - after this we know that either dquot_release() is |
863 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 864 | wait_on_dquot(dquot); |
268157ba JK |
865 | /* Read the dquot / allocate space in quota file */ |
866 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
867 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 868 | dqput(dquot); |
dd6f3c6d | 869 | dquot = NULL; |
cc33412f | 870 | goto out; |
1da177e4 | 871 | } |
62af9b52 | 872 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 873 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 874 | #endif |
cc33412f JK |
875 | out: |
876 | if (empty) | |
877 | do_destroy_dquot(empty); | |
1da177e4 LT |
878 | |
879 | return dquot; | |
880 | } | |
08d0350c | 881 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
882 | |
883 | static int dqinit_needed(struct inode *inode, int type) | |
884 | { | |
885 | int cnt; | |
886 | ||
887 | if (IS_NOQUOTA(inode)) | |
888 | return 0; | |
889 | if (type != -1) | |
dd6f3c6d | 890 | return !inode->i_dquot[type]; |
1da177e4 | 891 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 892 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
893 | return 1; |
894 | return 0; | |
895 | } | |
896 | ||
d3be915f | 897 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
898 | static void add_dquot_ref(struct super_block *sb, int type) |
899 | { | |
941d2380 | 900 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 901 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 902 | int reserved = 0; |
4c5e6c0e | 903 | #endif |
1da177e4 | 904 | |
d003fb70 CH |
905 | spin_lock(&inode_lock); |
906 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
b6fac63c | 907 | if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) |
aabb8fdb | 908 | continue; |
62af9b52 | 909 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 JK |
910 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
911 | reserved = 1; | |
4c5e6c0e | 912 | #endif |
d003fb70 CH |
913 | if (!atomic_read(&inode->i_writecount)) |
914 | continue; | |
915 | if (!dqinit_needed(inode, type)) | |
916 | continue; | |
d003fb70 CH |
917 | |
918 | __iget(inode); | |
919 | spin_unlock(&inode_lock); | |
920 | ||
941d2380 | 921 | iput(old_inode); |
871a2931 | 922 | __dquot_initialize(inode, type); |
941d2380 JK |
923 | /* We hold a reference to 'inode' so it couldn't have been |
924 | * removed from s_inodes list while we dropped the inode_lock. | |
925 | * We cannot iput the inode now as we can be holding the last | |
926 | * reference and we cannot iput it under inode_lock. So we | |
927 | * keep the reference and iput it later. */ | |
928 | old_inode = inode; | |
929 | spin_lock(&inode_lock); | |
1da177e4 | 930 | } |
d003fb70 | 931 | spin_unlock(&inode_lock); |
941d2380 | 932 | iput(old_inode); |
0a5a9c72 | 933 | |
62af9b52 | 934 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 JK |
935 | if (reserved) { |
936 | printk(KERN_WARNING "VFS (%s): Writes happened before quota" | |
937 | " was turned on thus quota information is probably " | |
938 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
939 | } | |
4c5e6c0e | 940 | #endif |
1da177e4 LT |
941 | } |
942 | ||
268157ba JK |
943 | /* |
944 | * Return 0 if dqput() won't block. | |
945 | * (note that 1 doesn't necessarily mean blocking) | |
946 | */ | |
1da177e4 LT |
947 | static inline int dqput_blocks(struct dquot *dquot) |
948 | { | |
949 | if (atomic_read(&dquot->dq_count) <= 1) | |
950 | return 1; | |
951 | return 0; | |
952 | } | |
953 | ||
268157ba JK |
954 | /* |
955 | * Remove references to dquots from inode and add dquot to list for freeing | |
956 | * if we have the last referece to dquot | |
957 | * We can't race with anybody because we hold dqptr_sem for writing... | |
958 | */ | |
e5f00f42 AB |
959 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
960 | struct list_head *tofree_head) | |
1da177e4 LT |
961 | { |
962 | struct dquot *dquot = inode->i_dquot[type]; | |
963 | ||
dd6f3c6d JK |
964 | inode->i_dquot[type] = NULL; |
965 | if (dquot) { | |
1da177e4 | 966 | if (dqput_blocks(dquot)) { |
62af9b52 | 967 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 LT |
968 | if (atomic_read(&dquot->dq_count) != 1) |
969 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
970 | #endif | |
971 | spin_lock(&dq_list_lock); | |
268157ba JK |
972 | /* As dquot must have currently users it can't be on |
973 | * the free list... */ | |
974 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
975 | spin_unlock(&dq_list_lock); |
976 | return 1; | |
977 | } | |
978 | else | |
979 | dqput(dquot); /* We have guaranteed we won't block */ | |
980 | } | |
981 | return 0; | |
982 | } | |
983 | ||
268157ba JK |
984 | /* |
985 | * Free list of dquots | |
986 | * Dquots are removed from inodes and no new references can be got so we are | |
987 | * the only ones holding reference | |
988 | */ | |
1da177e4 LT |
989 | static void put_dquot_list(struct list_head *tofree_head) |
990 | { | |
991 | struct list_head *act_head; | |
992 | struct dquot *dquot; | |
993 | ||
994 | act_head = tofree_head->next; | |
1da177e4 LT |
995 | while (act_head != tofree_head) { |
996 | dquot = list_entry(act_head, struct dquot, dq_free); | |
997 | act_head = act_head->next; | |
268157ba JK |
998 | /* Remove dquot from the list so we won't have problems... */ |
999 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1000 | dqput(dquot); |
1001 | } | |
1002 | } | |
1003 | ||
fb58b731 CH |
1004 | static void remove_dquot_ref(struct super_block *sb, int type, |
1005 | struct list_head *tofree_head) | |
1006 | { | |
1007 | struct inode *inode; | |
1008 | ||
1009 | spin_lock(&inode_lock); | |
1010 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
aabb8fdb NP |
1011 | /* |
1012 | * We have to scan also I_NEW inodes because they can already | |
1013 | * have quota pointer initialized. Luckily, we need to touch | |
1014 | * only quota pointers and these have separate locking | |
1015 | * (dqptr_sem). | |
1016 | */ | |
fb58b731 CH |
1017 | if (!IS_NOQUOTA(inode)) |
1018 | remove_inode_dquot_ref(inode, type, tofree_head); | |
1019 | } | |
1020 | spin_unlock(&inode_lock); | |
1021 | } | |
1022 | ||
1da177e4 LT |
1023 | /* Gather all references from inodes and drop them */ |
1024 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1025 | { | |
1026 | LIST_HEAD(tofree_head); | |
1027 | ||
fb58b731 CH |
1028 | if (sb->dq_op) { |
1029 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1030 | remove_dquot_ref(sb, type, &tofree_head); | |
1031 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
1032 | put_dquot_list(&tofree_head); | |
1033 | } | |
1da177e4 LT |
1034 | } |
1035 | ||
12095460 | 1036 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1037 | { |
1038 | dquot->dq_dqb.dqb_curinodes += number; | |
1039 | } | |
1040 | ||
1041 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1042 | { | |
1043 | dquot->dq_dqb.dqb_curspace += number; | |
1044 | } | |
1045 | ||
f18df228 MC |
1046 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1047 | { | |
1048 | dquot->dq_dqb.dqb_rsvspace += number; | |
1049 | } | |
1050 | ||
740d9dcd MC |
1051 | /* |
1052 | * Claim reserved quota space | |
1053 | */ | |
0a5a9c72 | 1054 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1055 | { |
0a5a9c72 JK |
1056 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1057 | WARN_ON_ONCE(1); | |
1058 | number = dquot->dq_dqb.dqb_rsvspace; | |
1059 | } | |
740d9dcd MC |
1060 | dquot->dq_dqb.dqb_curspace += number; |
1061 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1062 | } | |
1063 | ||
1064 | static inline | |
1065 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1066 | { | |
0a5a9c72 JK |
1067 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1068 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1069 | else { | |
1070 | WARN_ON_ONCE(1); | |
1071 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1072 | } | |
740d9dcd MC |
1073 | } |
1074 | ||
7a2435d8 | 1075 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1076 | { |
db49d2df JK |
1077 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1078 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1079 | dquot->dq_dqb.dqb_curinodes -= number; |
1080 | else | |
1081 | dquot->dq_dqb.dqb_curinodes = 0; | |
1082 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1083 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1084 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1085 | } | |
1086 | ||
7a2435d8 | 1087 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1088 | { |
db49d2df JK |
1089 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1090 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1091 | dquot->dq_dqb.dqb_curspace -= number; |
1092 | else | |
1093 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1094 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1095 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1096 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1097 | } | |
1098 | ||
c525460e JK |
1099 | static int warning_issued(struct dquot *dquot, const int warntype) |
1100 | { | |
1101 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1102 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1103 | ((warntype == QUOTA_NL_IHARDWARN || | |
1104 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1105 | ||
1106 | if (!flag) | |
1107 | return 0; | |
1108 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1109 | } | |
1110 | ||
8e893469 | 1111 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1112 | static int flag_print_warnings = 1; |
1113 | ||
7a2435d8 | 1114 | static int need_print_warning(struct dquot *dquot) |
1da177e4 LT |
1115 | { |
1116 | if (!flag_print_warnings) | |
1117 | return 0; | |
1118 | ||
1119 | switch (dquot->dq_type) { | |
1120 | case USRQUOTA: | |
da9592ed | 1121 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
1122 | case GRPQUOTA: |
1123 | return in_group_p(dquot->dq_id); | |
1124 | } | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1da177e4 | 1128 | /* Print warning to user which exceeded quota */ |
c525460e | 1129 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
1130 | { |
1131 | char *msg = NULL; | |
24ec839c | 1132 | struct tty_struct *tty; |
1da177e4 | 1133 | |
657d3bfa JK |
1134 | if (warntype == QUOTA_NL_IHARDBELOW || |
1135 | warntype == QUOTA_NL_ISOFTBELOW || | |
1136 | warntype == QUOTA_NL_BHARDBELOW || | |
1137 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1138 | return; |
1139 | ||
24ec839c PZ |
1140 | tty = get_current_tty(); |
1141 | if (!tty) | |
452a00d2 | 1142 | return; |
24ec839c | 1143 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1144 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1145 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1146 | else |
24ec839c PZ |
1147 | tty_write_message(tty, ": write failed, "); |
1148 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1149 | switch (warntype) { |
8e893469 | 1150 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1151 | msg = " file limit reached.\r\n"; |
1152 | break; | |
8e893469 | 1153 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1154 | msg = " file quota exceeded too long.\r\n"; |
1155 | break; | |
8e893469 | 1156 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1157 | msg = " file quota exceeded.\r\n"; |
1158 | break; | |
8e893469 | 1159 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1160 | msg = " block limit reached.\r\n"; |
1161 | break; | |
8e893469 | 1162 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1163 | msg = " block quota exceeded too long.\r\n"; |
1164 | break; | |
8e893469 | 1165 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1166 | msg = " block quota exceeded.\r\n"; |
1167 | break; | |
1168 | } | |
24ec839c | 1169 | tty_write_message(tty, msg); |
452a00d2 | 1170 | tty_kref_put(tty); |
1da177e4 | 1171 | } |
8e893469 JK |
1172 | #endif |
1173 | ||
f18df228 MC |
1174 | /* |
1175 | * Write warnings to the console and send warning messages over netlink. | |
1176 | * | |
1177 | * Note that this function can sleep. | |
1178 | */ | |
7a2435d8 | 1179 | static void flush_warnings(struct dquot *const *dquots, char *warntype) |
1da177e4 | 1180 | { |
86e931a3 | 1181 | struct dquot *dq; |
1da177e4 LT |
1182 | int i; |
1183 | ||
86e931a3 SW |
1184 | for (i = 0; i < MAXQUOTAS; i++) { |
1185 | dq = dquots[i]; | |
1186 | if (dq && warntype[i] != QUOTA_NL_NOWARN && | |
1187 | !warning_issued(dq, warntype[i])) { | |
8e893469 | 1188 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
86e931a3 | 1189 | print_warning(dq, warntype[i]); |
8e893469 | 1190 | #endif |
86e931a3 SW |
1191 | quota_send_warning(dq->dq_type, dq->dq_id, |
1192 | dq->dq_sb->s_dev, warntype[i]); | |
8e893469 | 1193 | } |
86e931a3 | 1194 | } |
1da177e4 LT |
1195 | } |
1196 | ||
7a2435d8 | 1197 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 LT |
1198 | { |
1199 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1200 | ||
1201 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1202 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1203 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | /* needs dq_data_lock */ | |
12095460 | 1207 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1208 | { |
268157ba JK |
1209 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1210 | ||
8e893469 | 1211 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1212 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1213 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
efd8f0e6 | 1214 | return 0; |
1da177e4 LT |
1215 | |
1216 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1217 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1218 | !ignore_hardlimit(dquot)) { |
8e893469 | 1219 | *warntype = QUOTA_NL_IHARDWARN; |
efd8f0e6 | 1220 | return -EDQUOT; |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1224 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1225 | dquot->dq_dqb.dqb_itime && | |
1226 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1227 | !ignore_hardlimit(dquot)) { |
8e893469 | 1228 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
efd8f0e6 | 1229 | return -EDQUOT; |
1da177e4 LT |
1230 | } |
1231 | ||
1232 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1233 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1234 | dquot->dq_dqb.dqb_itime == 0) { |
8e893469 | 1235 | *warntype = QUOTA_NL_ISOFTWARN; |
268157ba JK |
1236 | dquot->dq_dqb.dqb_itime = get_seconds() + |
1237 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; | |
1da177e4 LT |
1238 | } |
1239 | ||
efd8f0e6 | 1240 | return 0; |
1da177e4 LT |
1241 | } |
1242 | ||
1243 | /* needs dq_data_lock */ | |
1244 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1245 | { | |
f18df228 | 1246 | qsize_t tspace; |
268157ba | 1247 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1248 | |
8e893469 | 1249 | *warntype = QUOTA_NL_NOWARN; |
268157ba | 1250 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || |
f55abc0f | 1251 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1252 | return 0; |
1da177e4 | 1253 | |
f18df228 MC |
1254 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1255 | + space; | |
1256 | ||
1da177e4 | 1257 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1258 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1259 | !ignore_hardlimit(dquot)) { |
1260 | if (!prealloc) | |
8e893469 | 1261 | *warntype = QUOTA_NL_BHARDWARN; |
efd8f0e6 | 1262 | return -EDQUOT; |
1da177e4 LT |
1263 | } |
1264 | ||
1265 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1266 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1267 | dquot->dq_dqb.dqb_btime && |
1268 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1269 | !ignore_hardlimit(dquot)) { |
1270 | if (!prealloc) | |
8e893469 | 1271 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
efd8f0e6 | 1272 | return -EDQUOT; |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1276 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1277 | dquot->dq_dqb.dqb_btime == 0) { |
1278 | if (!prealloc) { | |
8e893469 | 1279 | *warntype = QUOTA_NL_BSOFTWARN; |
268157ba JK |
1280 | dquot->dq_dqb.dqb_btime = get_seconds() + |
1281 | sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; | |
1da177e4 LT |
1282 | } |
1283 | else | |
1284 | /* | |
1285 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1286 | * be always printed | |
1287 | */ | |
efd8f0e6 | 1288 | return -EDQUOT; |
1da177e4 LT |
1289 | } |
1290 | ||
efd8f0e6 | 1291 | return 0; |
1da177e4 LT |
1292 | } |
1293 | ||
12095460 | 1294 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1295 | { |
268157ba JK |
1296 | qsize_t newinodes; |
1297 | ||
657d3bfa | 1298 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f JK |
1299 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1300 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1301 | return QUOTA_NL_NOWARN; |
1302 | ||
268157ba JK |
1303 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1304 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1305 | return QUOTA_NL_ISOFTBELOW; |
1306 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1307 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1308 | return QUOTA_NL_IHARDBELOW; |
1309 | return QUOTA_NL_NOWARN; | |
1310 | } | |
1311 | ||
1312 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1313 | { | |
1314 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1315 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1316 | return QUOTA_NL_NOWARN; |
1317 | ||
12095460 | 1318 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1319 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1320 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1321 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1322 | return QUOTA_NL_BHARDBELOW; |
1323 | return QUOTA_NL_NOWARN; | |
1324 | } | |
0a5a9c72 | 1325 | |
1da177e4 | 1326 | /* |
871a2931 CH |
1327 | * Initialize quota pointers in inode |
1328 | * | |
1329 | * We do things in a bit complicated way but by that we avoid calling | |
1330 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1331 | * | |
1332 | * It is better to call this function outside of any transaction as it | |
1333 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1334 | */ |
871a2931 | 1335 | static void __dquot_initialize(struct inode *inode, int type) |
1da177e4 LT |
1336 | { |
1337 | unsigned int id = 0; | |
871a2931 | 1338 | int cnt; |
ad1e6e8d | 1339 | struct dquot *got[MAXQUOTAS]; |
cc33412f | 1340 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1341 | qsize_t rsv; |
1da177e4 | 1342 | |
d3be915f IM |
1343 | /* First test before acquiring mutex - solves deadlocks when we |
1344 | * re-enter the quota code and are already holding the mutex */ | |
871a2931 CH |
1345 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1346 | return; | |
cc33412f JK |
1347 | |
1348 | /* First get references to structures we might need. */ | |
1349 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
ad1e6e8d | 1350 | got[cnt] = NULL; |
cc33412f JK |
1351 | if (type != -1 && cnt != type) |
1352 | continue; | |
1353 | switch (cnt) { | |
1354 | case USRQUOTA: | |
1355 | id = inode->i_uid; | |
1356 | break; | |
1357 | case GRPQUOTA: | |
1358 | id = inode->i_gid; | |
1359 | break; | |
1360 | } | |
1361 | got[cnt] = dqget(sb, id, cnt); | |
1362 | } | |
1363 | ||
1364 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1365 | if (IS_NOQUOTA(inode)) |
1366 | goto out_err; | |
1367 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1368 | if (type != -1 && cnt != type) | |
1369 | continue; | |
cc33412f JK |
1370 | /* Avoid races with quotaoff() */ |
1371 | if (!sb_has_quota_active(sb, cnt)) | |
1372 | continue; | |
dd6f3c6d | 1373 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1374 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1375 | got[cnt] = NULL; |
0a5a9c72 JK |
1376 | /* |
1377 | * Make quota reservation system happy if someone | |
1378 | * did a write before quota was turned on | |
1379 | */ | |
1380 | rsv = inode_get_rsv_space(inode); | |
1381 | if (unlikely(rsv)) | |
1382 | dquot_resv_space(inode->i_dquot[cnt], rsv); | |
1da177e4 LT |
1383 | } |
1384 | } | |
1385 | out_err: | |
cc33412f JK |
1386 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1387 | /* Drop unused references */ | |
dc52dd3a | 1388 | dqput_all(got); |
871a2931 CH |
1389 | } |
1390 | ||
1391 | void dquot_initialize(struct inode *inode) | |
1392 | { | |
1393 | __dquot_initialize(inode, -1); | |
1da177e4 | 1394 | } |
08d0350c | 1395 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1396 | |
1397 | /* | |
1398 | * Release all quotas referenced by inode | |
1da177e4 | 1399 | */ |
9f754758 | 1400 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1401 | { |
1402 | int cnt; | |
cc33412f | 1403 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1404 | |
cc33412f | 1405 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1406 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1407 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1408 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1409 | } |
1410 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1411 | dqput_all(put); |
1da177e4 LT |
1412 | } |
1413 | ||
9f754758 CH |
1414 | void dquot_drop(struct inode *inode) |
1415 | { | |
1416 | int cnt; | |
1417 | ||
1418 | if (IS_NOQUOTA(inode)) | |
1419 | return; | |
1420 | ||
1421 | /* | |
1422 | * Test before calling to rule out calls from proc and such | |
1423 | * where we are not allowed to block. Note that this is | |
1424 | * actually reliable test even without the lock - the caller | |
1425 | * must assure that nobody can come after the DQUOT_DROP and | |
1426 | * add quota pointers back anyway. | |
1427 | */ | |
1428 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1429 | if (inode->i_dquot[cnt]) | |
1430 | break; | |
1431 | } | |
1432 | ||
1433 | if (cnt < MAXQUOTAS) | |
1434 | __dquot_drop(inode); | |
1435 | } | |
1436 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1437 | |
fd8fbfc1 DM |
1438 | /* |
1439 | * inode_reserved_space is managed internally by quota, and protected by | |
1440 | * i_lock similar to i_blocks+i_bytes. | |
1441 | */ | |
1442 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1443 | { | |
1444 | /* Filesystem must explicitly define it's own method in order to use | |
1445 | * quota reservation interface */ | |
1446 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1447 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1448 | } | |
1449 | ||
c469070a | 1450 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1451 | { |
1452 | spin_lock(&inode->i_lock); | |
1453 | *inode_reserved_space(inode) += number; | |
1454 | spin_unlock(&inode->i_lock); | |
1455 | } | |
c469070a | 1456 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1457 | |
c469070a | 1458 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1459 | { |
1460 | spin_lock(&inode->i_lock); | |
1461 | *inode_reserved_space(inode) -= number; | |
1462 | __inode_add_bytes(inode, number); | |
1463 | spin_unlock(&inode->i_lock); | |
1464 | } | |
c469070a | 1465 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1466 | |
c469070a | 1467 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1468 | { |
1469 | spin_lock(&inode->i_lock); | |
1470 | *inode_reserved_space(inode) -= number; | |
1471 | spin_unlock(&inode->i_lock); | |
1472 | } | |
c469070a | 1473 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1474 | |
1475 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1476 | { | |
1477 | qsize_t ret; | |
05b5d898 JK |
1478 | |
1479 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1480 | return 0; | |
fd8fbfc1 DM |
1481 | spin_lock(&inode->i_lock); |
1482 | ret = *inode_reserved_space(inode); | |
1483 | spin_unlock(&inode->i_lock); | |
1484 | return ret; | |
1485 | } | |
1486 | ||
1487 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1488 | int reserve) | |
1489 | { | |
1490 | if (reserve) | |
1491 | inode_add_rsv_space(inode, number); | |
1492 | else | |
1493 | inode_add_bytes(inode, number); | |
1494 | } | |
1495 | ||
1496 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1497 | { | |
1498 | if (reserve) | |
1499 | inode_sub_rsv_space(inode, number); | |
1500 | else | |
1501 | inode_sub_bytes(inode, number); | |
1502 | } | |
1503 | ||
1da177e4 | 1504 | /* |
5dd4056d CH |
1505 | * This functions updates i_blocks+i_bytes fields and quota information |
1506 | * (together with appropriate checks). | |
1507 | * | |
1508 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1509 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1510 | * the current transaction so that dquot write and inode write go into the | |
1511 | * same transaction. | |
1da177e4 LT |
1512 | */ |
1513 | ||
1514 | /* | |
1515 | * This operation can block, but only after everything is updated | |
1516 | */ | |
f18df228 | 1517 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
5dd4056d | 1518 | int warn, int reserve) |
1da177e4 | 1519 | { |
5dd4056d | 1520 | int cnt, ret = 0; |
1da177e4 LT |
1521 | char warntype[MAXQUOTAS]; |
1522 | ||
fd8fbfc1 DM |
1523 | /* |
1524 | * First test before acquiring mutex - solves deadlocks when we | |
1525 | * re-enter the quota code and are already holding the mutex | |
1526 | */ | |
5dd4056d | 1527 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 DM |
1528 | inode_incr_space(inode, number, reserve); |
1529 | goto out; | |
1530 | } | |
1531 | ||
1532 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1da177e4 | 1533 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1534 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1535 | |
1da177e4 LT |
1536 | spin_lock(&dq_data_lock); |
1537 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1538 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1539 | continue; |
efd8f0e6 CH |
1540 | ret = check_bdq(inode->i_dquot[cnt], number, !warn, |
1541 | warntype+cnt); | |
1542 | if (ret) { | |
fd8fbfc1 DM |
1543 | spin_unlock(&dq_data_lock); |
1544 | goto out_flush_warn; | |
f18df228 | 1545 | } |
1da177e4 LT |
1546 | } |
1547 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1548 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1549 | continue; |
f18df228 MC |
1550 | if (reserve) |
1551 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1552 | else | |
1553 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1554 | } |
fd8fbfc1 | 1555 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1556 | spin_unlock(&dq_data_lock); |
f18df228 | 1557 | |
fd8fbfc1 DM |
1558 | if (reserve) |
1559 | goto out_flush_warn; | |
dc52dd3a | 1560 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 DM |
1561 | out_flush_warn: |
1562 | flush_warnings(inode->i_dquot, warntype); | |
1da177e4 | 1563 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1564 | out: |
1565 | return ret; | |
1566 | } | |
5dd4056d | 1567 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1568 | |
1569 | /* | |
1570 | * This operation can block, but only after everything is updated | |
1571 | */ | |
63936dda | 1572 | int dquot_alloc_inode(const struct inode *inode) |
1da177e4 | 1573 | { |
efd8f0e6 | 1574 | int cnt, ret = 0; |
1da177e4 LT |
1575 | char warntype[MAXQUOTAS]; |
1576 | ||
d3be915f IM |
1577 | /* First test before acquiring mutex - solves deadlocks when we |
1578 | * re-enter the quota code and are already holding the mutex */ | |
63936dda CH |
1579 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1580 | return 0; | |
1da177e4 | 1581 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1582 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1583 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1584 | spin_lock(&dq_data_lock); |
1585 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1586 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1587 | continue; |
efd8f0e6 CH |
1588 | ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); |
1589 | if (ret) | |
1da177e4 LT |
1590 | goto warn_put_all; |
1591 | } | |
1592 | ||
1593 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1594 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1595 | continue; |
63936dda | 1596 | dquot_incr_inodes(inode->i_dquot[cnt], 1); |
1da177e4 | 1597 | } |
efd8f0e6 | 1598 | |
1da177e4 LT |
1599 | warn_put_all: |
1600 | spin_unlock(&dq_data_lock); | |
63936dda | 1601 | if (ret == 0) |
dc52dd3a | 1602 | mark_all_dquot_dirty(inode->i_dquot); |
087ee8d5 | 1603 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1604 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1605 | return ret; | |
1606 | } | |
08d0350c | 1607 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1608 | |
5dd4056d CH |
1609 | /* |
1610 | * Convert in-memory reserved quotas to real consumed quotas | |
1611 | */ | |
1612 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd MC |
1613 | { |
1614 | int cnt; | |
740d9dcd | 1615 | |
5dd4056d | 1616 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1617 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1618 | return 0; |
740d9dcd MC |
1619 | } |
1620 | ||
1621 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
740d9dcd MC |
1622 | spin_lock(&dq_data_lock); |
1623 | /* Claim reserved quotas to allocated quotas */ | |
1624 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1625 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1626 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1627 | number); | |
1628 | } | |
1629 | /* Update inode bytes */ | |
fd8fbfc1 | 1630 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1631 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1632 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd | 1633 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
5dd4056d | 1634 | return 0; |
740d9dcd | 1635 | } |
5dd4056d | 1636 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1637 | |
1da177e4 LT |
1638 | /* |
1639 | * This operation can block, but only after everything is updated | |
1640 | */ | |
5dd4056d | 1641 | void __dquot_free_space(struct inode *inode, qsize_t number, int reserve) |
1da177e4 LT |
1642 | { |
1643 | unsigned int cnt; | |
657d3bfa | 1644 | char warntype[MAXQUOTAS]; |
1da177e4 | 1645 | |
d3be915f IM |
1646 | /* First test before acquiring mutex - solves deadlocks when we |
1647 | * re-enter the quota code and are already holding the mutex */ | |
5dd4056d | 1648 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1649 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1650 | return; |
1da177e4 | 1651 | } |
657d3bfa | 1652 | |
1da177e4 | 1653 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1654 | spin_lock(&dq_data_lock); |
1655 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1656 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1657 | continue; |
657d3bfa | 1658 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
fd8fbfc1 DM |
1659 | if (reserve) |
1660 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1661 | else | |
1662 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1663 | } |
fd8fbfc1 | 1664 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1665 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1666 | |
1667 | if (reserve) | |
1668 | goto out_unlock; | |
dc52dd3a | 1669 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 | 1670 | out_unlock: |
657d3bfa | 1671 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1672 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
fd8fbfc1 | 1673 | } |
5dd4056d | 1674 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1675 | |
1da177e4 LT |
1676 | /* |
1677 | * This operation can block, but only after everything is updated | |
1678 | */ | |
63936dda | 1679 | void dquot_free_inode(const struct inode *inode) |
1da177e4 LT |
1680 | { |
1681 | unsigned int cnt; | |
657d3bfa | 1682 | char warntype[MAXQUOTAS]; |
1da177e4 | 1683 | |
d3be915f IM |
1684 | /* First test before acquiring mutex - solves deadlocks when we |
1685 | * re-enter the quota code and are already holding the mutex */ | |
63936dda CH |
1686 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1687 | return; | |
657d3bfa | 1688 | |
1da177e4 | 1689 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1690 | spin_lock(&dq_data_lock); |
1691 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1692 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1693 | continue; |
63936dda CH |
1694 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); |
1695 | dquot_decr_inodes(inode->i_dquot[cnt], 1); | |
1da177e4 LT |
1696 | } |
1697 | spin_unlock(&dq_data_lock); | |
dc52dd3a | 1698 | mark_all_dquot_dirty(inode->i_dquot); |
657d3bfa | 1699 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1700 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1701 | } |
08d0350c | 1702 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1703 | |
1704 | /* | |
1705 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1706 | * | |
1707 | * This operation can block, but only after everything is updated | |
1708 | * A transaction must be started when entering this function. | |
1709 | */ | |
b43fa828 | 1710 | static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask) |
1da177e4 | 1711 | { |
740d9dcd MC |
1712 | qsize_t space, cur_space; |
1713 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1714 | struct dquot *transfer_from[MAXQUOTAS]; |
1715 | struct dquot *transfer_to[MAXQUOTAS]; | |
efd8f0e6 | 1716 | int cnt, ret = 0; |
657d3bfa JK |
1717 | char warntype_to[MAXQUOTAS]; |
1718 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1719 | |
d3be915f IM |
1720 | /* First test before acquiring mutex - solves deadlocks when we |
1721 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 | 1722 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1723 | return 0; |
cc33412f | 1724 | /* Initialize the arrays */ |
1da177e4 | 1725 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
dd6f3c6d JK |
1726 | transfer_from[cnt] = NULL; |
1727 | transfer_to[cnt] = NULL; | |
657d3bfa | 1728 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1729 | } |
8ddd69d6 DM |
1730 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1731 | if (mask & (1 << cnt)) | |
1732 | transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt); | |
1733 | } | |
cc33412f | 1734 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
cc33412f JK |
1735 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
1736 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1737 | goto put_all; | |
1738 | } | |
1da177e4 | 1739 | spin_lock(&dq_data_lock); |
740d9dcd | 1740 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1741 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1742 | space = cur_space + rsv_space; |
1da177e4 LT |
1743 | /* Build the transfer_from list and check the limits */ |
1744 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1745 | if (!transfer_to[cnt]) |
1da177e4 LT |
1746 | continue; |
1747 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
efd8f0e6 CH |
1748 | ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); |
1749 | if (ret) | |
1750 | goto over_quota; | |
1751 | ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); | |
1752 | if (ret) | |
cc33412f | 1753 | goto over_quota; |
1da177e4 LT |
1754 | } |
1755 | ||
1756 | /* | |
1757 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1758 | */ | |
1759 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1760 | /* | |
1761 | * Skip changes for same uid or gid or for turned off quota-type. | |
1762 | */ | |
dd6f3c6d | 1763 | if (!transfer_to[cnt]) |
1da177e4 LT |
1764 | continue; |
1765 | ||
1766 | /* Due to IO error we might not have transfer_from[] structure */ | |
1767 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1768 | warntype_from_inodes[cnt] = |
1769 | info_idq_free(transfer_from[cnt], 1); | |
1770 | warntype_from_space[cnt] = | |
1771 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1772 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1773 | dquot_decr_space(transfer_from[cnt], cur_space); |
1774 | dquot_free_reserved_space(transfer_from[cnt], | |
1775 | rsv_space); | |
1da177e4 LT |
1776 | } |
1777 | ||
1778 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1779 | dquot_incr_space(transfer_to[cnt], cur_space); |
1780 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1781 | |
1782 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1783 | } | |
1da177e4 | 1784 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1785 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1786 | ||
dc52dd3a DM |
1787 | mark_all_dquot_dirty(transfer_from); |
1788 | mark_all_dquot_dirty(transfer_to); | |
1789 | /* The reference we got is transferred to the inode */ | |
1790 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1791 | transfer_to[cnt] = NULL; | |
cc33412f | 1792 | warn_put_all: |
657d3bfa JK |
1793 | flush_warnings(transfer_to, warntype_to); |
1794 | flush_warnings(transfer_from, warntype_from_inodes); | |
1795 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1796 | put_all: |
dc52dd3a DM |
1797 | dqput_all(transfer_from); |
1798 | dqput_all(transfer_to); | |
1da177e4 | 1799 | return ret; |
cc33412f JK |
1800 | over_quota: |
1801 | spin_unlock(&dq_data_lock); | |
1802 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1803 | /* Clear dquot pointers we don't want to dqput() */ | |
1804 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1805 | transfer_from[cnt] = NULL; |
cc33412f | 1806 | goto warn_put_all; |
1da177e4 LT |
1807 | } |
1808 | ||
8ddd69d6 DM |
1809 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1810 | * Called from FSXXX_setattr() | |
1811 | */ | |
b43fa828 | 1812 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1813 | { |
8ddd69d6 DM |
1814 | qid_t chid[MAXQUOTAS]; |
1815 | unsigned long mask = 0; | |
1816 | ||
1817 | if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) { | |
1818 | mask |= 1 << USRQUOTA; | |
1819 | chid[USRQUOTA] = iattr->ia_uid; | |
1820 | } | |
1821 | if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) { | |
1822 | mask |= 1 << GRPQUOTA; | |
1823 | chid[GRPQUOTA] = iattr->ia_gid; | |
1824 | } | |
f55abc0f | 1825 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
871a2931 | 1826 | dquot_initialize(inode); |
efd8f0e6 | 1827 | return __dquot_transfer(inode, chid, mask); |
b85f4b87 JK |
1828 | } |
1829 | return 0; | |
1830 | } | |
b43fa828 | 1831 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 1832 | |
1da177e4 LT |
1833 | /* |
1834 | * Write info of quota file to disk | |
1835 | */ | |
1836 | int dquot_commit_info(struct super_block *sb, int type) | |
1837 | { | |
1838 | int ret; | |
1839 | struct quota_info *dqopt = sb_dqopt(sb); | |
1840 | ||
d3be915f | 1841 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1842 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1843 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1844 | return ret; |
1845 | } | |
08d0350c | 1846 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1847 | |
1848 | /* | |
1849 | * Definitions of diskquota operations. | |
1850 | */ | |
61e225dc | 1851 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1852 | .write_dquot = dquot_commit, |
1853 | .acquire_dquot = dquot_acquire, | |
1854 | .release_dquot = dquot_release, | |
1855 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1856 | .write_info = dquot_commit_info, |
1857 | .alloc_dquot = dquot_alloc, | |
1858 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1859 | }; |
1860 | ||
907f4554 CH |
1861 | /* |
1862 | * Generic helper for ->open on filesystems supporting disk quotas. | |
1863 | */ | |
1864 | int dquot_file_open(struct inode *inode, struct file *file) | |
1865 | { | |
1866 | int error; | |
1867 | ||
1868 | error = generic_file_open(inode, file); | |
1869 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 1870 | dquot_initialize(inode); |
907f4554 CH |
1871 | return error; |
1872 | } | |
1873 | EXPORT_SYMBOL(dquot_file_open); | |
1874 | ||
1da177e4 LT |
1875 | /* |
1876 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1877 | */ | |
f55abc0f | 1878 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1879 | { |
0ff5af83 | 1880 | int cnt, ret = 0; |
1da177e4 LT |
1881 | struct quota_info *dqopt = sb_dqopt(sb); |
1882 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1883 | |
f55abc0f JK |
1884 | /* Cannot turn off usage accounting without turning off limits, or |
1885 | * suspend quotas and simultaneously turn quotas off. */ | |
1886 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1887 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1888 | DQUOT_USAGE_ENABLED))) | |
1889 | return -EINVAL; | |
1890 | ||
1da177e4 | 1891 | /* We need to serialize quota_off() for device */ |
d3be915f | 1892 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1893 | |
1894 | /* | |
1895 | * Skip everything if there's nothing to do. We have to do this because | |
1896 | * sometimes we are called when fill_super() failed and calling | |
1897 | * sync_fs() in such cases does no good. | |
1898 | */ | |
f55abc0f | 1899 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1900 | mutex_unlock(&dqopt->dqonoff_mutex); |
1901 | return 0; | |
1902 | } | |
1da177e4 LT |
1903 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1904 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1905 | if (type != -1 && cnt != type) |
1906 | continue; | |
f55abc0f | 1907 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1908 | continue; |
f55abc0f JK |
1909 | |
1910 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1911 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1912 | dqopt->flags |= |
1913 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1914 | spin_unlock(&dq_state_lock); |
f55abc0f | 1915 | } else { |
cc33412f | 1916 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1917 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1918 | /* Turning off suspended quotas? */ | |
1919 | if (!sb_has_quota_loaded(sb, cnt) && | |
1920 | sb_has_quota_suspended(sb, cnt)) { | |
1921 | dqopt->flags &= ~dquot_state_flag( | |
1922 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1923 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1924 | iput(dqopt->files[cnt]); |
1925 | dqopt->files[cnt] = NULL; | |
1926 | continue; | |
1927 | } | |
cc33412f | 1928 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1929 | } |
f55abc0f JK |
1930 | |
1931 | /* We still have to keep quota loaded? */ | |
1932 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1933 | continue; |
1da177e4 LT |
1934 | |
1935 | /* Note: these are blocking operations */ | |
1936 | drop_dquot_ref(sb, cnt); | |
1937 | invalidate_dquots(sb, cnt); | |
1938 | /* | |
268157ba JK |
1939 | * Now all dquots should be invalidated, all writes done so we |
1940 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
1941 | */ |
1942 | if (info_dirty(&dqopt->info[cnt])) | |
1943 | sb->dq_op->write_info(sb, cnt); | |
1944 | if (dqopt->ops[cnt]->free_file_info) | |
1945 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1946 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1947 | ||
1948 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1949 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1950 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1951 | dqopt->info[cnt].dqi_flags = 0; |
1952 | dqopt->info[cnt].dqi_igrace = 0; | |
1953 | dqopt->info[cnt].dqi_bgrace = 0; | |
1954 | dqopt->ops[cnt] = NULL; | |
1955 | } | |
d3be915f | 1956 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1957 | |
1958 | /* Skip syncing and setting flags if quota files are hidden */ | |
1959 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1960 | goto put_inodes; | |
1961 | ||
1da177e4 | 1962 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1963 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1964 | if (sb->s_op->sync_fs) |
1965 | sb->s_op->sync_fs(sb, 1); | |
1966 | sync_blockdev(sb->s_bdev); | |
1967 | /* Now the quota files are just ordinary files and we can set the | |
1968 | * inode flags back. Moreover we discard the pagecache so that | |
1969 | * userspace sees the writes we did bypassing the pagecache. We | |
1970 | * must also discard the blockdev buffers so that we see the | |
1971 | * changes done by userspace on the next quotaon() */ | |
1972 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1973 | if (toputinode[cnt]) { | |
d3be915f | 1974 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1975 | /* If quota was reenabled in the meantime, we have |
1976 | * nothing to do */ | |
f55abc0f | 1977 | if (!sb_has_quota_loaded(sb, cnt)) { |
268157ba JK |
1978 | mutex_lock_nested(&toputinode[cnt]->i_mutex, |
1979 | I_MUTEX_QUOTA); | |
1da177e4 LT |
1980 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1981 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
1982 | truncate_inode_pages(&toputinode[cnt]->i_data, |
1983 | 0); | |
1b1dcc1b | 1984 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1985 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1986 | } |
d3be915f | 1987 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1988 | } |
1989 | if (sb->s_bdev) | |
1990 | invalidate_bdev(sb->s_bdev); | |
1991 | put_inodes: | |
1992 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1993 | if (toputinode[cnt]) { | |
0ff5af83 | 1994 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1995 | * can reenable quota on the subsequent remount RW. We |
1996 | * have to check 'flags' variable and not use sb_has_ | |
1997 | * function because another quotaon / quotaoff could | |
1998 | * change global state before we got here. We refuse | |
1999 | * to suspend quotas when there is pending delete on | |
2000 | * the quota file... */ | |
2001 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2002 | iput(toputinode[cnt]); |
2003 | else if (!toputinode[cnt]->i_nlink) | |
2004 | ret = -EBUSY; | |
1da177e4 | 2005 | } |
0ff5af83 | 2006 | return ret; |
1da177e4 | 2007 | } |
08d0350c | 2008 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 2009 | |
f55abc0f JK |
2010 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
2011 | { | |
2012 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
2013 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
2014 | } | |
08d0350c | 2015 | EXPORT_SYMBOL(vfs_quota_off); |
1da177e4 LT |
2016 | /* |
2017 | * Turn quotas on on a device | |
2018 | */ | |
2019 | ||
f55abc0f JK |
2020 | /* |
2021 | * Helper function to turn quotas on when we already have the inode of | |
2022 | * quota file and no quota information is loaded. | |
2023 | */ | |
2024 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2025 | unsigned int flags) | |
1da177e4 LT |
2026 | { |
2027 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2028 | struct super_block *sb = inode->i_sb; | |
2029 | struct quota_info *dqopt = sb_dqopt(sb); | |
2030 | int error; | |
2031 | int oldflags = -1; | |
2032 | ||
2033 | if (!fmt) | |
2034 | return -ESRCH; | |
2035 | if (!S_ISREG(inode->i_mode)) { | |
2036 | error = -EACCES; | |
2037 | goto out_fmt; | |
2038 | } | |
2039 | if (IS_RDONLY(inode)) { | |
2040 | error = -EROFS; | |
2041 | goto out_fmt; | |
2042 | } | |
2043 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
2044 | error = -EINVAL; | |
2045 | goto out_fmt; | |
2046 | } | |
f55abc0f JK |
2047 | /* Usage always has to be set... */ |
2048 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2049 | error = -EINVAL; | |
2050 | goto out_fmt; | |
2051 | } | |
1da177e4 | 2052 | |
ca785ec6 | 2053 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2054 | /* As we bypass the pagecache we must now flush all the |
2055 | * dirty data and invalidate caches so that kernel sees | |
2056 | * changes from userspace. It is not enough to just flush | |
2057 | * the quota file since if blocksize < pagesize, invalidation | |
2058 | * of the cache could fail because of other unrelated dirty | |
2059 | * data */ | |
2060 | sync_filesystem(sb); | |
ca785ec6 JK |
2061 | invalidate_bdev(sb->s_bdev); |
2062 | } | |
d3be915f | 2063 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2064 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2065 | error = -EBUSY; |
2066 | goto out_lock; | |
2067 | } | |
ca785ec6 JK |
2068 | |
2069 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2070 | /* We don't want quota and atime on quota files (deadlocks | |
2071 | * possible) Also nobody should write to the file - we use | |
2072 | * special IO operations which ignore the immutable bit. */ | |
dee86565 | 2073 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
268157ba JK |
2074 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2075 | S_NOQUOTA); | |
ca785ec6 | 2076 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2077 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
2078 | /* |
2079 | * When S_NOQUOTA is set, remove dquot references as no more | |
2080 | * references can be added | |
2081 | */ | |
9f754758 | 2082 | __dquot_drop(inode); |
ca785ec6 | 2083 | } |
1da177e4 LT |
2084 | |
2085 | error = -EIO; | |
2086 | dqopt->files[type] = igrab(inode); | |
2087 | if (!dqopt->files[type]) | |
2088 | goto out_lock; | |
2089 | error = -EINVAL; | |
2090 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2091 | goto out_file_init; | |
2092 | ||
2093 | dqopt->ops[type] = fmt->qf_ops; | |
2094 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2095 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2096 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2097 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2098 | error = dqopt->ops[type]->read_file_info(sb, type); |
2099 | if (error < 0) { | |
d3be915f | 2100 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2101 | goto out_file_init; |
2102 | } | |
d3be915f | 2103 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2104 | spin_lock(&dq_state_lock); |
f55abc0f | 2105 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2106 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2107 | |
2108 | add_dquot_ref(sb, type); | |
d3be915f | 2109 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2110 | |
2111 | return 0; | |
2112 | ||
2113 | out_file_init: | |
2114 | dqopt->files[type] = NULL; | |
2115 | iput(inode); | |
2116 | out_lock: | |
1da177e4 | 2117 | if (oldflags != -1) { |
dee86565 | 2118 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2119 | /* Set the flags back (in the case of accidental quotaon() |
2120 | * on a wrong file we don't want to mess up the flags) */ | |
2121 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2122 | inode->i_flags |= oldflags; | |
dee86565 | 2123 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2124 | } |
d01730d7 | 2125 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2126 | out_fmt: |
2127 | put_quota_format(fmt); | |
2128 | ||
2129 | return error; | |
2130 | } | |
2131 | ||
0ff5af83 JK |
2132 | /* Reenable quotas on remount RW */ |
2133 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2134 | { | |
2135 | struct quota_info *dqopt = sb_dqopt(sb); | |
2136 | struct inode *inode; | |
2137 | int ret; | |
f55abc0f | 2138 | unsigned int flags; |
0ff5af83 JK |
2139 | |
2140 | mutex_lock(&dqopt->dqonoff_mutex); | |
2141 | if (!sb_has_quota_suspended(sb, type)) { | |
2142 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2143 | return 0; | |
2144 | } | |
0ff5af83 JK |
2145 | inode = dqopt->files[type]; |
2146 | dqopt->files[type] = NULL; | |
cc33412f | 2147 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2148 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2149 | DQUOT_LIMITS_ENABLED, type); | |
2150 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2151 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2152 | mutex_unlock(&dqopt->dqonoff_mutex); |
2153 | ||
f55abc0f JK |
2154 | flags = dquot_generic_flag(flags, type); |
2155 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2156 | flags); | |
0ff5af83 JK |
2157 | iput(inode); |
2158 | ||
2159 | return ret; | |
2160 | } | |
2161 | ||
77e69dac AV |
2162 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2163 | struct path *path) | |
2164 | { | |
2165 | int error = security_quota_on(path->dentry); | |
2166 | if (error) | |
2167 | return error; | |
2168 | /* Quota file not on the same filesystem? */ | |
2169 | if (path->mnt->mnt_sb != sb) | |
2170 | error = -EXDEV; | |
2171 | else | |
f55abc0f JK |
2172 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2173 | format_id, DQUOT_USAGE_ENABLED | | |
2174 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2175 | return error; |
2176 | } | |
08d0350c | 2177 | EXPORT_SYMBOL(vfs_quota_on_path); |
77e69dac | 2178 | |
8264613d | 2179 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2180 | int remount) |
1da177e4 | 2181 | { |
8264613d | 2182 | struct path path; |
1da177e4 LT |
2183 | int error; |
2184 | ||
0ff5af83 JK |
2185 | if (remount) |
2186 | return vfs_quota_on_remount(sb, type); | |
2187 | ||
8264613d | 2188 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2189 | if (!error) { |
8264613d AV |
2190 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2191 | path_put(&path); | |
77e69dac | 2192 | } |
1da177e4 LT |
2193 | return error; |
2194 | } | |
08d0350c | 2195 | EXPORT_SYMBOL(vfs_quota_on); |
1da177e4 | 2196 | |
f55abc0f JK |
2197 | /* |
2198 | * More powerful function for turning on quotas allowing setting | |
2199 | * of individual quota flags | |
2200 | */ | |
2201 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2202 | unsigned int flags) | |
2203 | { | |
2204 | int ret = 0; | |
2205 | struct super_block *sb = inode->i_sb; | |
2206 | struct quota_info *dqopt = sb_dqopt(sb); | |
2207 | ||
2208 | /* Just unsuspend quotas? */ | |
2209 | if (flags & DQUOT_SUSPENDED) | |
2210 | return vfs_quota_on_remount(sb, type); | |
2211 | if (!flags) | |
2212 | return 0; | |
2213 | /* Just updating flags needed? */ | |
2214 | if (sb_has_quota_loaded(sb, type)) { | |
2215 | mutex_lock(&dqopt->dqonoff_mutex); | |
2216 | /* Now do a reliable test... */ | |
2217 | if (!sb_has_quota_loaded(sb, type)) { | |
2218 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2219 | goto load_quota; | |
2220 | } | |
2221 | if (flags & DQUOT_USAGE_ENABLED && | |
2222 | sb_has_quota_usage_enabled(sb, type)) { | |
2223 | ret = -EBUSY; | |
2224 | goto out_lock; | |
2225 | } | |
2226 | if (flags & DQUOT_LIMITS_ENABLED && | |
2227 | sb_has_quota_limits_enabled(sb, type)) { | |
2228 | ret = -EBUSY; | |
2229 | goto out_lock; | |
2230 | } | |
cc33412f | 2231 | spin_lock(&dq_state_lock); |
f55abc0f | 2232 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2233 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2234 | out_lock: |
2235 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2236 | return ret; | |
2237 | } | |
2238 | ||
2239 | load_quota: | |
2240 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2241 | } | |
08d0350c | 2242 | EXPORT_SYMBOL(vfs_quota_enable); |
f55abc0f | 2243 | |
1da177e4 LT |
2244 | /* |
2245 | * This function is used when filesystem needs to initialize quotas | |
2246 | * during mount time. | |
2247 | */ | |
84de856e CH |
2248 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2249 | int format_id, int type) | |
1da177e4 | 2250 | { |
84de856e | 2251 | struct dentry *dentry; |
1da177e4 LT |
2252 | int error; |
2253 | ||
c56818d7 | 2254 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2255 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2256 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2257 | if (IS_ERR(dentry)) |
2258 | return PTR_ERR(dentry); | |
2259 | ||
154f484b JK |
2260 | if (!dentry->d_inode) { |
2261 | error = -ENOENT; | |
2262 | goto out; | |
2263 | } | |
2264 | ||
1da177e4 | 2265 | error = security_quota_on(dentry); |
84de856e | 2266 | if (!error) |
f55abc0f JK |
2267 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2268 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2269 | |
154f484b | 2270 | out: |
84de856e CH |
2271 | dput(dentry); |
2272 | return error; | |
1da177e4 | 2273 | } |
08d0350c | 2274 | EXPORT_SYMBOL(vfs_quota_on_mount); |
1da177e4 | 2275 | |
b85f4b87 JK |
2276 | /* Wrapper to turn on quotas when remounting rw */ |
2277 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2278 | { | |
2279 | int cnt; | |
2280 | int ret = 0, err; | |
2281 | ||
2282 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2283 | return -ENOSYS; | |
2284 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2285 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2286 | if (err < 0 && !ret) | |
2287 | ret = err; | |
2288 | } | |
2289 | return ret; | |
2290 | } | |
08d0350c | 2291 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |
b85f4b87 | 2292 | |
12095460 JK |
2293 | static inline qsize_t qbtos(qsize_t blocks) |
2294 | { | |
2295 | return blocks << QIF_DQBLKSIZE_BITS; | |
2296 | } | |
2297 | ||
2298 | static inline qsize_t stoqb(qsize_t space) | |
2299 | { | |
2300 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2301 | } | |
2302 | ||
1da177e4 | 2303 | /* Generic routine for getting common part of quota structure */ |
b9b2dd36 | 2304 | static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2305 | { |
2306 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2307 | ||
b9b2dd36 CH |
2308 | memset(di, 0, sizeof(*di)); |
2309 | di->d_version = FS_DQUOT_VERSION; | |
2310 | di->d_flags = dquot->dq_type == USRQUOTA ? | |
2311 | XFS_USER_QUOTA : XFS_GROUP_QUOTA; | |
2312 | di->d_id = dquot->dq_id; | |
2313 | ||
1da177e4 | 2314 | spin_lock(&dq_data_lock); |
b9b2dd36 CH |
2315 | di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); |
2316 | di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); | |
2317 | di->d_ino_hardlimit = dm->dqb_ihardlimit; | |
2318 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
2319 | di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; | |
2320 | di->d_icount = dm->dqb_curinodes; | |
2321 | di->d_btimer = dm->dqb_btime; | |
2322 | di->d_itimer = dm->dqb_itime; | |
1da177e4 LT |
2323 | spin_unlock(&dq_data_lock); |
2324 | } | |
2325 | ||
268157ba | 2326 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, |
b9b2dd36 | 2327 | struct fs_disk_quota *di) |
1da177e4 LT |
2328 | { |
2329 | struct dquot *dquot; | |
2330 | ||
cc33412f | 2331 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2332 | if (!dquot) |
1da177e4 | 2333 | return -ESRCH; |
1da177e4 LT |
2334 | do_get_dqblk(dquot, di); |
2335 | dqput(dquot); | |
cc33412f | 2336 | |
1da177e4 LT |
2337 | return 0; |
2338 | } | |
08d0350c | 2339 | EXPORT_SYMBOL(vfs_get_dqblk); |
1da177e4 LT |
2340 | |
2341 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2342 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2343 | { |
2344 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2345 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2346 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2347 | ||
2348 | if ((di->dqb_valid & QIF_BLIMITS && | |
2349 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2350 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2351 | (di->dqb_valid & QIF_ILIMITS && | |
2352 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2353 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2354 | return -ERANGE; | |
1da177e4 LT |
2355 | |
2356 | spin_lock(&dq_data_lock); | |
2357 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2358 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2359 | check_blim = 1; |
08261673 | 2360 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2361 | } |
2362 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2363 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2364 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2365 | check_blim = 1; |
08261673 | 2366 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2367 | } |
2368 | if (di->dqb_valid & QIF_INODES) { | |
2369 | dm->dqb_curinodes = di->dqb_curinodes; | |
2370 | check_ilim = 1; | |
08261673 | 2371 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2372 | } |
2373 | if (di->dqb_valid & QIF_ILIMITS) { | |
2374 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2375 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2376 | check_ilim = 1; | |
08261673 | 2377 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2378 | } |
4d59bce4 | 2379 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2380 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2381 | check_blim = 1; |
08261673 | 2382 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 JK |
2383 | } |
2384 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2385 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2386 | check_ilim = 1; |
08261673 | 2387 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2388 | } |
1da177e4 LT |
2389 | |
2390 | if (check_blim) { | |
268157ba JK |
2391 | if (!dm->dqb_bsoftlimit || |
2392 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2393 | dm->dqb_btime = 0; |
2394 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
268157ba JK |
2395 | } else if (!(di->dqb_valid & QIF_BTIME)) |
2396 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2397 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2398 | } |
2399 | if (check_ilim) { | |
268157ba JK |
2400 | if (!dm->dqb_isoftlimit || |
2401 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2402 | dm->dqb_itime = 0; |
2403 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
268157ba JK |
2404 | } else if (!(di->dqb_valid & QIF_ITIME)) |
2405 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2406 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2407 | } |
268157ba JK |
2408 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2409 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2410 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2411 | else | |
2412 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2413 | spin_unlock(&dq_data_lock); | |
2414 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2415 | |
2416 | return 0; | |
1da177e4 LT |
2417 | } |
2418 | ||
268157ba JK |
2419 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, |
2420 | struct if_dqblk *di) | |
1da177e4 LT |
2421 | { |
2422 | struct dquot *dquot; | |
338bf9af | 2423 | int rc; |
1da177e4 | 2424 | |
f55abc0f JK |
2425 | dquot = dqget(sb, id, type); |
2426 | if (!dquot) { | |
2427 | rc = -ESRCH; | |
2428 | goto out; | |
1da177e4 | 2429 | } |
338bf9af | 2430 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2431 | dqput(dquot); |
f55abc0f | 2432 | out: |
338bf9af | 2433 | return rc; |
1da177e4 | 2434 | } |
08d0350c | 2435 | EXPORT_SYMBOL(vfs_set_dqblk); |
1da177e4 LT |
2436 | |
2437 | /* Generic routine for getting common part of quota file information */ | |
2438 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2439 | { | |
2440 | struct mem_dqinfo *mi; | |
2441 | ||
d3be915f | 2442 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2443 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2444 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2445 | return -ESRCH; |
2446 | } | |
2447 | mi = sb_dqopt(sb)->info + type; | |
2448 | spin_lock(&dq_data_lock); | |
2449 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2450 | ii->dqi_igrace = mi->dqi_igrace; | |
2451 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2452 | ii->dqi_valid = IIF_ALL; | |
2453 | spin_unlock(&dq_data_lock); | |
d3be915f | 2454 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2455 | return 0; |
2456 | } | |
08d0350c | 2457 | EXPORT_SYMBOL(vfs_get_dqinfo); |
1da177e4 LT |
2458 | |
2459 | /* Generic routine for setting common part of quota file information */ | |
2460 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2461 | { | |
2462 | struct mem_dqinfo *mi; | |
f55abc0f | 2463 | int err = 0; |
1da177e4 | 2464 | |
d3be915f | 2465 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2466 | if (!sb_has_quota_active(sb, type)) { |
2467 | err = -ESRCH; | |
2468 | goto out; | |
1da177e4 LT |
2469 | } |
2470 | mi = sb_dqopt(sb)->info + type; | |
2471 | spin_lock(&dq_data_lock); | |
2472 | if (ii->dqi_valid & IIF_BGRACE) | |
2473 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2474 | if (ii->dqi_valid & IIF_IGRACE) | |
2475 | mi->dqi_igrace = ii->dqi_igrace; | |
2476 | if (ii->dqi_valid & IIF_FLAGS) | |
268157ba JK |
2477 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | |
2478 | (ii->dqi_flags & DQF_MASK); | |
1da177e4 LT |
2479 | spin_unlock(&dq_data_lock); |
2480 | mark_info_dirty(sb, type); | |
2481 | /* Force write to disk */ | |
2482 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2483 | out: |
d3be915f | 2484 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2485 | return err; |
1da177e4 | 2486 | } |
08d0350c | 2487 | EXPORT_SYMBOL(vfs_set_dqinfo); |
1da177e4 | 2488 | |
0d54b217 | 2489 | const struct quotactl_ops vfs_quotactl_ops = { |
1da177e4 LT |
2490 | .quota_on = vfs_quota_on, |
2491 | .quota_off = vfs_quota_off, | |
2492 | .quota_sync = vfs_quota_sync, | |
2493 | .get_info = vfs_get_dqinfo, | |
2494 | .set_info = vfs_set_dqinfo, | |
2495 | .get_dqblk = vfs_get_dqblk, | |
2496 | .set_dqblk = vfs_set_dqblk | |
2497 | }; | |
2498 | ||
dde95888 DM |
2499 | |
2500 | static int do_proc_dqstats(struct ctl_table *table, int write, | |
2501 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2502 | { | |
2503 | #ifdef CONFIG_SMP | |
2504 | /* Update global table */ | |
2505 | unsigned int type = (int *)table->data - dqstats.stat; | |
2506 | dqstats.stat[type] = dqstats_read(type); | |
2507 | #endif | |
2508 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
2509 | } | |
2510 | ||
1da177e4 LT |
2511 | static ctl_table fs_dqstats_table[] = { |
2512 | { | |
1da177e4 | 2513 | .procname = "lookups", |
dde95888 | 2514 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2515 | .maxlen = sizeof(int), |
2516 | .mode = 0444, | |
dde95888 | 2517 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2518 | }, |
2519 | { | |
1da177e4 | 2520 | .procname = "drops", |
dde95888 | 2521 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2522 | .maxlen = sizeof(int), |
2523 | .mode = 0444, | |
dde95888 | 2524 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2525 | }, |
2526 | { | |
1da177e4 | 2527 | .procname = "reads", |
dde95888 | 2528 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2529 | .maxlen = sizeof(int), |
2530 | .mode = 0444, | |
dde95888 | 2531 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2532 | }, |
2533 | { | |
1da177e4 | 2534 | .procname = "writes", |
dde95888 | 2535 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2536 | .maxlen = sizeof(int), |
2537 | .mode = 0444, | |
dde95888 | 2538 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2539 | }, |
2540 | { | |
1da177e4 | 2541 | .procname = "cache_hits", |
dde95888 | 2542 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2543 | .maxlen = sizeof(int), |
2544 | .mode = 0444, | |
dde95888 | 2545 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2546 | }, |
2547 | { | |
1da177e4 | 2548 | .procname = "allocated_dquots", |
dde95888 | 2549 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2550 | .maxlen = sizeof(int), |
2551 | .mode = 0444, | |
dde95888 | 2552 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2553 | }, |
2554 | { | |
1da177e4 | 2555 | .procname = "free_dquots", |
dde95888 | 2556 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2557 | .maxlen = sizeof(int), |
2558 | .mode = 0444, | |
dde95888 | 2559 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2560 | }, |
2561 | { | |
1da177e4 | 2562 | .procname = "syncs", |
dde95888 | 2563 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2564 | .maxlen = sizeof(int), |
2565 | .mode = 0444, | |
dde95888 | 2566 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2567 | }, |
8e893469 | 2568 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2569 | { |
1da177e4 LT |
2570 | .procname = "warnings", |
2571 | .data = &flag_print_warnings, | |
2572 | .maxlen = sizeof(int), | |
2573 | .mode = 0644, | |
6d456111 | 2574 | .proc_handler = proc_dointvec, |
1da177e4 | 2575 | }, |
8e893469 | 2576 | #endif |
ab09203e | 2577 | { }, |
1da177e4 LT |
2578 | }; |
2579 | ||
2580 | static ctl_table fs_table[] = { | |
2581 | { | |
1da177e4 LT |
2582 | .procname = "quota", |
2583 | .mode = 0555, | |
2584 | .child = fs_dqstats_table, | |
2585 | }, | |
ab09203e | 2586 | { }, |
1da177e4 LT |
2587 | }; |
2588 | ||
2589 | static ctl_table sys_table[] = { | |
2590 | { | |
1da177e4 LT |
2591 | .procname = "fs", |
2592 | .mode = 0555, | |
2593 | .child = fs_table, | |
2594 | }, | |
ab09203e | 2595 | { }, |
1da177e4 LT |
2596 | }; |
2597 | ||
2598 | static int __init dquot_init(void) | |
2599 | { | |
2600 | int i; | |
2601 | unsigned long nr_hash, order; | |
2602 | ||
2603 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2604 | ||
0b4d4147 | 2605 | register_sysctl_table(sys_table); |
1da177e4 | 2606 | |
20c2df83 | 2607 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2608 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2609 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2610 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2611 | NULL); |
1da177e4 LT |
2612 | |
2613 | order = 0; | |
2614 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2615 | if (!dquot_hash) | |
2616 | panic("Cannot create dquot hash table"); | |
2617 | ||
dde95888 DM |
2618 | #ifdef CONFIG_SMP |
2619 | dqstats_pcpu = alloc_percpu(struct dqstats); | |
2620 | if (!dqstats_pcpu) | |
2621 | panic("Cannot create dquot stats table"); | |
2622 | #endif | |
2623 | memset(&dqstats, 0, sizeof(struct dqstats)); | |
2624 | ||
1da177e4 LT |
2625 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2626 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2627 | dq_hash_bits = 0; | |
2628 | do { | |
2629 | dq_hash_bits++; | |
2630 | } while (nr_hash >> dq_hash_bits); | |
2631 | dq_hash_bits--; | |
2632 | ||
2633 | nr_hash = 1UL << dq_hash_bits; | |
2634 | dq_hash_mask = nr_hash - 1; | |
2635 | for (i = 0; i < nr_hash; i++) | |
2636 | INIT_HLIST_HEAD(dquot_hash + i); | |
2637 | ||
2638 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2639 | nr_hash, order, (PAGE_SIZE << order)); | |
2640 | ||
8e1f936b | 2641 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2642 | |
2643 | return 0; | |
2644 | } | |
2645 | module_init(dquot_init); |