Commit | Line | Data |
---|---|---|
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 | ||
83 | #define __DQUOT_PARANOIA | |
84 | ||
85 | /* | |
cc33412f JK |
86 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
87 | * and quota formats, dqstats structure containing statistics about the lists | |
88 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and | |
89 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 90 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
91 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
92 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
93 | * about latest values take it as well. | |
1da177e4 | 94 | * |
cc33412f JK |
95 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
96 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
97 | * |
98 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
99 | * the life of the dquot structure and so needn't to be protected by a lock | |
100 | * | |
101 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
102 | * operation is just reading pointers from inode (or not using them at all) the | |
26245c94 JK |
103 | * read lock is enough. If pointers are altered function must hold write lock. |
104 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that | |
105 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
106 | * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they | |
107 | * have to do all pointer modifications before dropping dqptr_sem. This makes | |
108 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and | |
109 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 110 | * |
d3be915f | 111 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
112 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
113 | * Currently dquot is locked only when it is being read to memory (or space for | |
114 | * it is being allocated) on the first dqget() and when it is being released on | |
115 | * the last dqput(). The allocation and release oparations are serialized by | |
116 | * the dq_lock and by checking the use count in dquot_release(). Write | |
117 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
118 | * spinlock to internal buffers before writing. | |
119 | * | |
120 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
121 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
122 | * dqio_mutex | |
cc33412f JK |
123 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
124 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
125 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
126 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
127 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
128 | * called with dqptr_sem held. | |
d3be915f | 129 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
130 | */ |
131 | ||
c516610c JK |
132 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
133 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
134 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 135 | EXPORT_SYMBOL(dq_data_lock); |
1da177e4 LT |
136 | |
137 | static char *quotatypes[] = INITQFNAMES; | |
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); |
1da177e4 | 231 | |
0a5a9c72 JK |
232 | static qsize_t inode_get_rsv_space(struct inode *inode); |
233 | ||
1da177e4 LT |
234 | static inline unsigned int |
235 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
236 | { | |
237 | unsigned long tmp; | |
238 | ||
239 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
240 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Following list functions expect dq_list_lock to be held | |
245 | */ | |
246 | static inline void insert_dquot_hash(struct dquot *dquot) | |
247 | { | |
268157ba JK |
248 | struct hlist_head *head; |
249 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
1da177e4 LT |
250 | hlist_add_head(&dquot->dq_hash, head); |
251 | } | |
252 | ||
253 | static inline void remove_dquot_hash(struct dquot *dquot) | |
254 | { | |
255 | hlist_del_init(&dquot->dq_hash); | |
256 | } | |
257 | ||
7a2435d8 JK |
258 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
259 | unsigned int id, int type) | |
1da177e4 LT |
260 | { |
261 | struct hlist_node *node; | |
262 | struct dquot *dquot; | |
263 | ||
264 | hlist_for_each (node, dquot_hash+hashent) { | |
265 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
268157ba JK |
266 | if (dquot->dq_sb == sb && dquot->dq_id == id && |
267 | dquot->dq_type == type) | |
1da177e4 LT |
268 | return dquot; |
269 | } | |
dd6f3c6d | 270 | return NULL; |
1da177e4 LT |
271 | } |
272 | ||
273 | /* Add a dquot to the tail of the free list */ | |
274 | static inline void put_dquot_last(struct dquot *dquot) | |
275 | { | |
8e13059a | 276 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
277 | dqstats.free_dquots++; |
278 | } | |
279 | ||
280 | static inline void remove_free_dquot(struct dquot *dquot) | |
281 | { | |
282 | if (list_empty(&dquot->dq_free)) | |
283 | return; | |
284 | list_del_init(&dquot->dq_free); | |
285 | dqstats.free_dquots--; | |
286 | } | |
287 | ||
288 | static inline void put_inuse(struct dquot *dquot) | |
289 | { | |
290 | /* We add to the back of inuse list so we don't have to restart | |
291 | * when traversing this list and we block */ | |
8e13059a | 292 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
293 | dqstats.allocated_dquots++; |
294 | } | |
295 | ||
296 | static inline void remove_inuse(struct dquot *dquot) | |
297 | { | |
298 | dqstats.allocated_dquots--; | |
299 | list_del(&dquot->dq_inuse); | |
300 | } | |
301 | /* | |
302 | * End of list functions needing dq_list_lock | |
303 | */ | |
304 | ||
305 | static void wait_on_dquot(struct dquot *dquot) | |
306 | { | |
d3be915f IM |
307 | mutex_lock(&dquot->dq_lock); |
308 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
309 | } |
310 | ||
03f6e92b JK |
311 | static inline int dquot_dirty(struct dquot *dquot) |
312 | { | |
313 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
314 | } | |
315 | ||
316 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
317 | { | |
318 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
319 | } | |
1da177e4 LT |
320 | |
321 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
322 | { | |
323 | spin_lock(&dq_list_lock); | |
324 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
325 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
326 | info[dquot->dq_type].dqi_dirty_list); | |
327 | spin_unlock(&dq_list_lock); | |
328 | return 0; | |
329 | } | |
08d0350c | 330 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 331 | |
dc52dd3a DM |
332 | /* Dirtify all the dquots - this can block when journalling */ |
333 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
334 | { | |
335 | int ret, err, cnt; | |
336 | ||
337 | ret = err = 0; | |
338 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
339 | if (dquot[cnt]) | |
340 | /* Even in case of error we have to continue */ | |
341 | ret = mark_dquot_dirty(dquot[cnt]); | |
342 | if (!err) | |
343 | err = ret; | |
344 | } | |
345 | return err; | |
346 | } | |
347 | ||
348 | static inline void dqput_all(struct dquot **dquot) | |
349 | { | |
350 | unsigned int cnt; | |
351 | ||
352 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
353 | dqput(dquot[cnt]); | |
354 | } | |
355 | ||
1da177e4 LT |
356 | /* This function needs dq_list_lock */ |
357 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
358 | { | |
359 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
360 | return 0; | |
361 | list_del_init(&dquot->dq_dirty); | |
362 | return 1; | |
363 | } | |
364 | ||
365 | void mark_info_dirty(struct super_block *sb, int type) | |
366 | { | |
367 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
368 | } | |
369 | EXPORT_SYMBOL(mark_info_dirty); | |
370 | ||
371 | /* | |
372 | * Read dquot from disk and alloc space for it | |
373 | */ | |
374 | ||
375 | int dquot_acquire(struct dquot *dquot) | |
376 | { | |
377 | int ret = 0, ret2 = 0; | |
378 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
379 | ||
d3be915f IM |
380 | mutex_lock(&dquot->dq_lock); |
381 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
382 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
383 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
384 | if (ret < 0) | |
385 | goto out_iolock; | |
386 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
387 | /* Instantiate dquot if needed */ | |
388 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
389 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
390 | /* Write the info if needed */ | |
268157ba JK |
391 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
392 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
393 | dquot->dq_sb, dquot->dq_type); | |
394 | } | |
1da177e4 LT |
395 | if (ret < 0) |
396 | goto out_iolock; | |
397 | if (ret2 < 0) { | |
398 | ret = ret2; | |
399 | goto out_iolock; | |
400 | } | |
401 | } | |
402 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
403 | out_iolock: | |
d3be915f IM |
404 | mutex_unlock(&dqopt->dqio_mutex); |
405 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
406 | return ret; |
407 | } | |
08d0350c | 408 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
409 | |
410 | /* | |
411 | * Write dquot to disk | |
412 | */ | |
413 | int dquot_commit(struct dquot *dquot) | |
414 | { | |
415 | int ret = 0, ret2 = 0; | |
416 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
417 | ||
d3be915f | 418 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
419 | spin_lock(&dq_list_lock); |
420 | if (!clear_dquot_dirty(dquot)) { | |
421 | spin_unlock(&dq_list_lock); | |
422 | goto out_sem; | |
423 | } | |
424 | spin_unlock(&dq_list_lock); | |
425 | /* Inactive dquot can be only if there was error during read/init | |
426 | * => we have better not writing it */ | |
427 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
428 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
268157ba JK |
429 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
430 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
431 | dquot->dq_sb, dquot->dq_type); | |
432 | } | |
1da177e4 LT |
433 | if (ret >= 0) |
434 | ret = ret2; | |
435 | } | |
436 | out_sem: | |
d3be915f | 437 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
438 | return ret; |
439 | } | |
08d0350c | 440 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
441 | |
442 | /* | |
443 | * Release dquot | |
444 | */ | |
445 | int dquot_release(struct dquot *dquot) | |
446 | { | |
447 | int ret = 0, ret2 = 0; | |
448 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
449 | ||
d3be915f | 450 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
451 | /* Check whether we are not racing with some other dqget() */ |
452 | if (atomic_read(&dquot->dq_count) > 1) | |
453 | goto out_dqlock; | |
d3be915f | 454 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
455 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
456 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
457 | /* Write the info */ | |
268157ba JK |
458 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
459 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
460 | dquot->dq_sb, dquot->dq_type); | |
461 | } | |
1da177e4 LT |
462 | if (ret >= 0) |
463 | ret = ret2; | |
464 | } | |
465 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 466 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 467 | out_dqlock: |
d3be915f | 468 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
469 | return ret; |
470 | } | |
08d0350c | 471 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 472 | |
7d9056ba | 473 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
474 | { |
475 | kmem_cache_free(dquot_cachep, dquot); | |
476 | } | |
7d9056ba | 477 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
478 | |
479 | static inline void do_destroy_dquot(struct dquot *dquot) | |
480 | { | |
481 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
482 | } | |
483 | ||
1da177e4 LT |
484 | /* Invalidate all dquots on the list. Note that this function is called after |
485 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
486 | * quota users. There can still be some users of quotas due to inodes being |
487 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 488 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 489 | */ |
1da177e4 LT |
490 | static void invalidate_dquots(struct super_block *sb, int type) |
491 | { | |
c33ed271 | 492 | struct dquot *dquot, *tmp; |
1da177e4 | 493 | |
6362e4d4 | 494 | restart: |
1da177e4 | 495 | spin_lock(&dq_list_lock); |
c33ed271 | 496 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
497 | if (dquot->dq_sb != sb) |
498 | continue; | |
499 | if (dquot->dq_type != type) | |
500 | continue; | |
6362e4d4 JK |
501 | /* Wait for dquot users */ |
502 | if (atomic_read(&dquot->dq_count)) { | |
503 | DEFINE_WAIT(wait); | |
504 | ||
505 | atomic_inc(&dquot->dq_count); | |
506 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
507 | TASK_UNINTERRUPTIBLE); | |
508 | spin_unlock(&dq_list_lock); | |
509 | /* Once dqput() wakes us up, we know it's time to free | |
510 | * the dquot. | |
511 | * IMPORTANT: we rely on the fact that there is always | |
512 | * at most one process waiting for dquot to free. | |
513 | * Otherwise dq_count would be > 1 and we would never | |
514 | * wake up. | |
515 | */ | |
516 | if (atomic_read(&dquot->dq_count) > 1) | |
517 | schedule(); | |
518 | finish_wait(&dquot->dq_wait_unused, &wait); | |
519 | dqput(dquot); | |
520 | /* At this moment dquot() need not exist (it could be | |
521 | * reclaimed by prune_dqcache(). Hence we must | |
522 | * restart. */ | |
523 | goto restart; | |
524 | } | |
525 | /* | |
526 | * Quota now has no users and it has been written on last | |
527 | * dqput() | |
528 | */ | |
1da177e4 LT |
529 | remove_dquot_hash(dquot); |
530 | remove_free_dquot(dquot); | |
531 | remove_inuse(dquot); | |
74f783af | 532 | do_destroy_dquot(dquot); |
1da177e4 LT |
533 | } |
534 | spin_unlock(&dq_list_lock); | |
535 | } | |
536 | ||
12c77527 JK |
537 | /* Call callback for every active dquot on given filesystem */ |
538 | int dquot_scan_active(struct super_block *sb, | |
539 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
540 | unsigned long priv) | |
541 | { | |
542 | struct dquot *dquot, *old_dquot = NULL; | |
543 | int ret = 0; | |
544 | ||
545 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
546 | spin_lock(&dq_list_lock); | |
547 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
548 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
549 | continue; | |
550 | if (dquot->dq_sb != sb) | |
551 | continue; | |
552 | /* Now we have active dquot so we can just increase use count */ | |
553 | atomic_inc(&dquot->dq_count); | |
554 | dqstats.lookups++; | |
555 | spin_unlock(&dq_list_lock); | |
556 | dqput(old_dquot); | |
557 | old_dquot = dquot; | |
558 | ret = fn(dquot, priv); | |
559 | if (ret < 0) | |
560 | goto out; | |
561 | spin_lock(&dq_list_lock); | |
562 | /* We are safe to continue now because our dquot could not | |
563 | * be moved out of the inuse list while we hold the reference */ | |
564 | } | |
565 | spin_unlock(&dq_list_lock); | |
566 | out: | |
567 | dqput(old_dquot); | |
568 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
569 | return ret; | |
570 | } | |
08d0350c | 571 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 572 | |
5fb324ad | 573 | int vfs_quota_sync(struct super_block *sb, int type, int wait) |
1da177e4 LT |
574 | { |
575 | struct list_head *dirty; | |
576 | struct dquot *dquot; | |
577 | struct quota_info *dqopt = sb_dqopt(sb); | |
578 | int cnt; | |
579 | ||
d3be915f | 580 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
581 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
582 | if (type != -1 && cnt != type) | |
583 | continue; | |
f55abc0f | 584 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
585 | continue; |
586 | spin_lock(&dq_list_lock); | |
587 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
588 | while (!list_empty(dirty)) { | |
268157ba JK |
589 | dquot = list_first_entry(dirty, struct dquot, |
590 | dq_dirty); | |
1da177e4 LT |
591 | /* Dirty and inactive can be only bad dquot... */ |
592 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
593 | clear_dquot_dirty(dquot); | |
594 | continue; | |
595 | } | |
596 | /* Now we have active dquot from which someone is | |
597 | * holding reference so we can safely just increase | |
598 | * use count */ | |
599 | atomic_inc(&dquot->dq_count); | |
600 | dqstats.lookups++; | |
601 | spin_unlock(&dq_list_lock); | |
602 | sb->dq_op->write_dquot(dquot); | |
603 | dqput(dquot); | |
604 | spin_lock(&dq_list_lock); | |
605 | } | |
606 | spin_unlock(&dq_list_lock); | |
607 | } | |
608 | ||
609 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
610 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
611 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 LT |
612 | sb->dq_op->write_info(sb, cnt); |
613 | spin_lock(&dq_list_lock); | |
614 | dqstats.syncs++; | |
615 | spin_unlock(&dq_list_lock); | |
d3be915f | 616 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 617 | |
5fb324ad CH |
618 | if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) |
619 | return 0; | |
620 | ||
621 | /* This is not very clever (and fast) but currently I don't know about | |
622 | * any other simple way of getting quota data to disk and we must get | |
623 | * them there for userspace to be visible... */ | |
624 | if (sb->s_op->sync_fs) | |
625 | sb->s_op->sync_fs(sb, 1); | |
626 | sync_blockdev(sb->s_bdev); | |
627 | ||
628 | /* | |
629 | * Now when everything is written we can discard the pagecache so | |
630 | * that userspace sees the changes. | |
631 | */ | |
632 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
633 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
634 | if (type != -1 && cnt != type) | |
635 | continue; | |
636 | if (!sb_has_quota_active(sb, cnt)) | |
637 | continue; | |
638 | mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, | |
639 | I_MUTEX_QUOTA); | |
640 | truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); | |
641 | mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); | |
642 | } | |
643 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
644 | ||
1da177e4 LT |
645 | return 0; |
646 | } | |
08d0350c | 647 | EXPORT_SYMBOL(vfs_quota_sync); |
1da177e4 LT |
648 | |
649 | /* Free unused dquots from cache */ | |
650 | static void prune_dqcache(int count) | |
651 | { | |
652 | struct list_head *head; | |
653 | struct dquot *dquot; | |
654 | ||
655 | head = free_dquots.prev; | |
656 | while (head != &free_dquots && count) { | |
657 | dquot = list_entry(head, struct dquot, dq_free); | |
658 | remove_dquot_hash(dquot); | |
659 | remove_free_dquot(dquot); | |
660 | remove_inuse(dquot); | |
74f783af | 661 | do_destroy_dquot(dquot); |
1da177e4 LT |
662 | count--; |
663 | head = free_dquots.prev; | |
664 | } | |
665 | } | |
666 | ||
667 | /* | |
668 | * This is called from kswapd when we think we need some | |
669 | * more memory | |
670 | */ | |
671 | ||
27496a8c | 672 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
673 | { |
674 | if (nr) { | |
675 | spin_lock(&dq_list_lock); | |
676 | prune_dqcache(nr); | |
677 | spin_unlock(&dq_list_lock); | |
678 | } | |
679 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
680 | } | |
681 | ||
8e1f936b RR |
682 | static struct shrinker dqcache_shrinker = { |
683 | .shrink = shrink_dqcache_memory, | |
684 | .seeks = DEFAULT_SEEKS, | |
685 | }; | |
686 | ||
1da177e4 LT |
687 | /* |
688 | * Put reference to dquot | |
689 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 690 | */ |
3d9ea253 | 691 | void dqput(struct dquot *dquot) |
1da177e4 | 692 | { |
b48d3805 JK |
693 | int ret; |
694 | ||
1da177e4 LT |
695 | if (!dquot) |
696 | return; | |
697 | #ifdef __DQUOT_PARANOIA | |
698 | if (!atomic_read(&dquot->dq_count)) { | |
699 | printk("VFS: dqput: trying to free free dquot\n"); | |
700 | printk("VFS: device %s, dquot of %s %d\n", | |
701 | dquot->dq_sb->s_id, | |
702 | quotatypes[dquot->dq_type], | |
703 | dquot->dq_id); | |
704 | BUG(); | |
705 | } | |
706 | #endif | |
707 | ||
708 | spin_lock(&dq_list_lock); | |
709 | dqstats.drops++; | |
710 | spin_unlock(&dq_list_lock); | |
711 | we_slept: | |
712 | spin_lock(&dq_list_lock); | |
713 | if (atomic_read(&dquot->dq_count) > 1) { | |
714 | /* We have more than one user... nothing to do */ | |
715 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 716 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 717 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
718 | atomic_read(&dquot->dq_count) == 1) |
719 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
720 | spin_unlock(&dq_list_lock); |
721 | return; | |
722 | } | |
723 | /* Need to release dquot? */ | |
724 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
725 | spin_unlock(&dq_list_lock); | |
726 | /* Commit dquot before releasing */ | |
b48d3805 JK |
727 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
728 | if (ret < 0) { | |
729 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
730 | "device %s (error %d). Quota may get out of " | |
731 | "sync!\n", dquot->dq_sb->s_id, ret); | |
732 | /* | |
733 | * We clear dirty bit anyway, so that we avoid | |
734 | * infinite loop here | |
735 | */ | |
736 | spin_lock(&dq_list_lock); | |
737 | clear_dquot_dirty(dquot); | |
738 | spin_unlock(&dq_list_lock); | |
739 | } | |
1da177e4 LT |
740 | goto we_slept; |
741 | } | |
742 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
743 | clear_dquot_dirty(dquot); | |
744 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
745 | spin_unlock(&dq_list_lock); | |
746 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
747 | goto we_slept; | |
748 | } | |
749 | atomic_dec(&dquot->dq_count); | |
750 | #ifdef __DQUOT_PARANOIA | |
751 | /* sanity check */ | |
8abf6a47 | 752 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
753 | #endif |
754 | put_dquot_last(dquot); | |
755 | spin_unlock(&dq_list_lock); | |
756 | } | |
08d0350c | 757 | EXPORT_SYMBOL(dqput); |
1da177e4 | 758 | |
7d9056ba | 759 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
760 | { |
761 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
762 | } | |
7d9056ba | 763 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 764 | |
1da177e4 LT |
765 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
766 | { | |
767 | struct dquot *dquot; | |
768 | ||
74f783af | 769 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 770 | if(!dquot) |
dd6f3c6d | 771 | return NULL; |
1da177e4 | 772 | |
d3be915f | 773 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
774 | INIT_LIST_HEAD(&dquot->dq_free); |
775 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
776 | INIT_HLIST_NODE(&dquot->dq_hash); | |
777 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 778 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
779 | dquot->dq_sb = sb; |
780 | dquot->dq_type = type; | |
781 | atomic_set(&dquot->dq_count, 1); | |
782 | ||
783 | return dquot; | |
784 | } | |
785 | ||
786 | /* | |
787 | * Get reference to dquot | |
cc33412f JK |
788 | * |
789 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
790 | * destroying our dquot by: | |
791 | * a) checking for quota flags under dq_list_lock and | |
792 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 793 | */ |
3d9ea253 | 794 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
795 | { |
796 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 797 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 798 | |
f55abc0f | 799 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 800 | return NULL; |
1da177e4 LT |
801 | we_slept: |
802 | spin_lock(&dq_list_lock); | |
cc33412f JK |
803 | spin_lock(&dq_state_lock); |
804 | if (!sb_has_quota_active(sb, type)) { | |
805 | spin_unlock(&dq_state_lock); | |
806 | spin_unlock(&dq_list_lock); | |
807 | goto out; | |
808 | } | |
809 | spin_unlock(&dq_state_lock); | |
810 | ||
dd6f3c6d JK |
811 | dquot = find_dquot(hashent, sb, id, type); |
812 | if (!dquot) { | |
813 | if (!empty) { | |
1da177e4 | 814 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
815 | empty = get_empty_dquot(sb, type); |
816 | if (!empty) | |
1da177e4 LT |
817 | schedule(); /* Try to wait for a moment... */ |
818 | goto we_slept; | |
819 | } | |
820 | dquot = empty; | |
dd6f3c6d | 821 | empty = NULL; |
1da177e4 LT |
822 | dquot->dq_id = id; |
823 | /* all dquots go on the inuse_list */ | |
824 | put_inuse(dquot); | |
825 | /* hash it first so it can be found */ | |
826 | insert_dquot_hash(dquot); | |
827 | dqstats.lookups++; | |
828 | spin_unlock(&dq_list_lock); | |
829 | } else { | |
830 | if (!atomic_read(&dquot->dq_count)) | |
831 | remove_free_dquot(dquot); | |
832 | atomic_inc(&dquot->dq_count); | |
833 | dqstats.cache_hits++; | |
834 | dqstats.lookups++; | |
835 | spin_unlock(&dq_list_lock); | |
1da177e4 | 836 | } |
268157ba JK |
837 | /* Wait for dq_lock - after this we know that either dquot_release() is |
838 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 839 | wait_on_dquot(dquot); |
268157ba JK |
840 | /* Read the dquot / allocate space in quota file */ |
841 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
842 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 843 | dqput(dquot); |
dd6f3c6d | 844 | dquot = NULL; |
cc33412f | 845 | goto out; |
1da177e4 LT |
846 | } |
847 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 848 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 849 | #endif |
cc33412f JK |
850 | out: |
851 | if (empty) | |
852 | do_destroy_dquot(empty); | |
1da177e4 LT |
853 | |
854 | return dquot; | |
855 | } | |
08d0350c | 856 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
857 | |
858 | static int dqinit_needed(struct inode *inode, int type) | |
859 | { | |
860 | int cnt; | |
861 | ||
862 | if (IS_NOQUOTA(inode)) | |
863 | return 0; | |
864 | if (type != -1) | |
dd6f3c6d | 865 | return !inode->i_dquot[type]; |
1da177e4 | 866 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 867 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
868 | return 1; |
869 | return 0; | |
870 | } | |
871 | ||
d3be915f | 872 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
873 | static void add_dquot_ref(struct super_block *sb, int type) |
874 | { | |
941d2380 | 875 | struct inode *inode, *old_inode = NULL; |
0a5a9c72 | 876 | int reserved = 0; |
1da177e4 | 877 | |
d003fb70 CH |
878 | spin_lock(&inode_lock); |
879 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
b6fac63c | 880 | if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) |
aabb8fdb | 881 | continue; |
0a5a9c72 JK |
882 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
883 | reserved = 1; | |
d003fb70 CH |
884 | if (!atomic_read(&inode->i_writecount)) |
885 | continue; | |
886 | if (!dqinit_needed(inode, type)) | |
887 | continue; | |
d003fb70 CH |
888 | |
889 | __iget(inode); | |
890 | spin_unlock(&inode_lock); | |
891 | ||
941d2380 | 892 | iput(old_inode); |
d003fb70 | 893 | sb->dq_op->initialize(inode, type); |
941d2380 JK |
894 | /* We hold a reference to 'inode' so it couldn't have been |
895 | * removed from s_inodes list while we dropped the inode_lock. | |
896 | * We cannot iput the inode now as we can be holding the last | |
897 | * reference and we cannot iput it under inode_lock. So we | |
898 | * keep the reference and iput it later. */ | |
899 | old_inode = inode; | |
900 | spin_lock(&inode_lock); | |
1da177e4 | 901 | } |
d003fb70 | 902 | spin_unlock(&inode_lock); |
941d2380 | 903 | iput(old_inode); |
0a5a9c72 JK |
904 | |
905 | if (reserved) { | |
906 | printk(KERN_WARNING "VFS (%s): Writes happened before quota" | |
907 | " was turned on thus quota information is probably " | |
908 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
909 | } | |
1da177e4 LT |
910 | } |
911 | ||
268157ba JK |
912 | /* |
913 | * Return 0 if dqput() won't block. | |
914 | * (note that 1 doesn't necessarily mean blocking) | |
915 | */ | |
1da177e4 LT |
916 | static inline int dqput_blocks(struct dquot *dquot) |
917 | { | |
918 | if (atomic_read(&dquot->dq_count) <= 1) | |
919 | return 1; | |
920 | return 0; | |
921 | } | |
922 | ||
268157ba JK |
923 | /* |
924 | * Remove references to dquots from inode and add dquot to list for freeing | |
925 | * if we have the last referece to dquot | |
926 | * We can't race with anybody because we hold dqptr_sem for writing... | |
927 | */ | |
e5f00f42 AB |
928 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
929 | struct list_head *tofree_head) | |
1da177e4 LT |
930 | { |
931 | struct dquot *dquot = inode->i_dquot[type]; | |
932 | ||
dd6f3c6d JK |
933 | inode->i_dquot[type] = NULL; |
934 | if (dquot) { | |
1da177e4 LT |
935 | if (dqput_blocks(dquot)) { |
936 | #ifdef __DQUOT_PARANOIA | |
937 | if (atomic_read(&dquot->dq_count) != 1) | |
938 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
939 | #endif | |
940 | spin_lock(&dq_list_lock); | |
268157ba JK |
941 | /* As dquot must have currently users it can't be on |
942 | * the free list... */ | |
943 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
944 | spin_unlock(&dq_list_lock); |
945 | return 1; | |
946 | } | |
947 | else | |
948 | dqput(dquot); /* We have guaranteed we won't block */ | |
949 | } | |
950 | return 0; | |
951 | } | |
952 | ||
268157ba JK |
953 | /* |
954 | * Free list of dquots | |
955 | * Dquots are removed from inodes and no new references can be got so we are | |
956 | * the only ones holding reference | |
957 | */ | |
1da177e4 LT |
958 | static void put_dquot_list(struct list_head *tofree_head) |
959 | { | |
960 | struct list_head *act_head; | |
961 | struct dquot *dquot; | |
962 | ||
963 | act_head = tofree_head->next; | |
1da177e4 LT |
964 | while (act_head != tofree_head) { |
965 | dquot = list_entry(act_head, struct dquot, dq_free); | |
966 | act_head = act_head->next; | |
268157ba JK |
967 | /* Remove dquot from the list so we won't have problems... */ |
968 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
969 | dqput(dquot); |
970 | } | |
971 | } | |
972 | ||
fb58b731 CH |
973 | static void remove_dquot_ref(struct super_block *sb, int type, |
974 | struct list_head *tofree_head) | |
975 | { | |
976 | struct inode *inode; | |
977 | ||
978 | spin_lock(&inode_lock); | |
979 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
aabb8fdb NP |
980 | /* |
981 | * We have to scan also I_NEW inodes because they can already | |
982 | * have quota pointer initialized. Luckily, we need to touch | |
983 | * only quota pointers and these have separate locking | |
984 | * (dqptr_sem). | |
985 | */ | |
fb58b731 CH |
986 | if (!IS_NOQUOTA(inode)) |
987 | remove_inode_dquot_ref(inode, type, tofree_head); | |
988 | } | |
989 | spin_unlock(&inode_lock); | |
990 | } | |
991 | ||
1da177e4 LT |
992 | /* Gather all references from inodes and drop them */ |
993 | static void drop_dquot_ref(struct super_block *sb, int type) | |
994 | { | |
995 | LIST_HEAD(tofree_head); | |
996 | ||
fb58b731 CH |
997 | if (sb->dq_op) { |
998 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
999 | remove_dquot_ref(sb, type, &tofree_head); | |
1000 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
1001 | put_dquot_list(&tofree_head); | |
1002 | } | |
1da177e4 LT |
1003 | } |
1004 | ||
12095460 | 1005 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1006 | { |
1007 | dquot->dq_dqb.dqb_curinodes += number; | |
1008 | } | |
1009 | ||
1010 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1011 | { | |
1012 | dquot->dq_dqb.dqb_curspace += number; | |
1013 | } | |
1014 | ||
f18df228 MC |
1015 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1016 | { | |
1017 | dquot->dq_dqb.dqb_rsvspace += number; | |
1018 | } | |
1019 | ||
740d9dcd MC |
1020 | /* |
1021 | * Claim reserved quota space | |
1022 | */ | |
0a5a9c72 | 1023 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1024 | { |
0a5a9c72 JK |
1025 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1026 | WARN_ON_ONCE(1); | |
1027 | number = dquot->dq_dqb.dqb_rsvspace; | |
1028 | } | |
740d9dcd MC |
1029 | dquot->dq_dqb.dqb_curspace += number; |
1030 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1031 | } | |
1032 | ||
1033 | static inline | |
1034 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1035 | { | |
0a5a9c72 JK |
1036 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1037 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1038 | else { | |
1039 | WARN_ON_ONCE(1); | |
1040 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1041 | } | |
740d9dcd MC |
1042 | } |
1043 | ||
7a2435d8 | 1044 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1045 | { |
db49d2df JK |
1046 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1047 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1048 | dquot->dq_dqb.dqb_curinodes -= number; |
1049 | else | |
1050 | dquot->dq_dqb.dqb_curinodes = 0; | |
1051 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1052 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1053 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1054 | } | |
1055 | ||
7a2435d8 | 1056 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1057 | { |
db49d2df JK |
1058 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1059 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1060 | dquot->dq_dqb.dqb_curspace -= number; |
1061 | else | |
1062 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1063 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1064 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1065 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1066 | } | |
1067 | ||
c525460e JK |
1068 | static int warning_issued(struct dquot *dquot, const int warntype) |
1069 | { | |
1070 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1071 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1072 | ((warntype == QUOTA_NL_IHARDWARN || | |
1073 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1074 | ||
1075 | if (!flag) | |
1076 | return 0; | |
1077 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1078 | } | |
1079 | ||
8e893469 | 1080 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1081 | static int flag_print_warnings = 1; |
1082 | ||
7a2435d8 | 1083 | static int need_print_warning(struct dquot *dquot) |
1da177e4 LT |
1084 | { |
1085 | if (!flag_print_warnings) | |
1086 | return 0; | |
1087 | ||
1088 | switch (dquot->dq_type) { | |
1089 | case USRQUOTA: | |
da9592ed | 1090 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
1091 | case GRPQUOTA: |
1092 | return in_group_p(dquot->dq_id); | |
1093 | } | |
1094 | return 0; | |
1095 | } | |
1096 | ||
1da177e4 | 1097 | /* Print warning to user which exceeded quota */ |
c525460e | 1098 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
1099 | { |
1100 | char *msg = NULL; | |
24ec839c | 1101 | struct tty_struct *tty; |
1da177e4 | 1102 | |
657d3bfa JK |
1103 | if (warntype == QUOTA_NL_IHARDBELOW || |
1104 | warntype == QUOTA_NL_ISOFTBELOW || | |
1105 | warntype == QUOTA_NL_BHARDBELOW || | |
1106 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1107 | return; |
1108 | ||
24ec839c PZ |
1109 | tty = get_current_tty(); |
1110 | if (!tty) | |
452a00d2 | 1111 | return; |
24ec839c | 1112 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1113 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1114 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1115 | else |
24ec839c PZ |
1116 | tty_write_message(tty, ": write failed, "); |
1117 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1118 | switch (warntype) { |
8e893469 | 1119 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1120 | msg = " file limit reached.\r\n"; |
1121 | break; | |
8e893469 | 1122 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1123 | msg = " file quota exceeded too long.\r\n"; |
1124 | break; | |
8e893469 | 1125 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1126 | msg = " file quota exceeded.\r\n"; |
1127 | break; | |
8e893469 | 1128 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1129 | msg = " block limit reached.\r\n"; |
1130 | break; | |
8e893469 | 1131 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1132 | msg = " block quota exceeded too long.\r\n"; |
1133 | break; | |
8e893469 | 1134 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1135 | msg = " block quota exceeded.\r\n"; |
1136 | break; | |
1137 | } | |
24ec839c | 1138 | tty_write_message(tty, msg); |
452a00d2 | 1139 | tty_kref_put(tty); |
1da177e4 | 1140 | } |
8e893469 JK |
1141 | #endif |
1142 | ||
f18df228 MC |
1143 | /* |
1144 | * Write warnings to the console and send warning messages over netlink. | |
1145 | * | |
1146 | * Note that this function can sleep. | |
1147 | */ | |
7a2435d8 | 1148 | static void flush_warnings(struct dquot *const *dquots, char *warntype) |
1da177e4 | 1149 | { |
86e931a3 | 1150 | struct dquot *dq; |
1da177e4 LT |
1151 | int i; |
1152 | ||
86e931a3 SW |
1153 | for (i = 0; i < MAXQUOTAS; i++) { |
1154 | dq = dquots[i]; | |
1155 | if (dq && warntype[i] != QUOTA_NL_NOWARN && | |
1156 | !warning_issued(dq, warntype[i])) { | |
8e893469 | 1157 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
86e931a3 | 1158 | print_warning(dq, warntype[i]); |
8e893469 | 1159 | #endif |
86e931a3 SW |
1160 | quota_send_warning(dq->dq_type, dq->dq_id, |
1161 | dq->dq_sb->s_dev, warntype[i]); | |
8e893469 | 1162 | } |
86e931a3 | 1163 | } |
1da177e4 LT |
1164 | } |
1165 | ||
7a2435d8 | 1166 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 LT |
1167 | { |
1168 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1169 | ||
1170 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1171 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1172 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | /* needs dq_data_lock */ | |
12095460 | 1176 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1177 | { |
268157ba JK |
1178 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1179 | ||
8e893469 | 1180 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1181 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1182 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1183 | return QUOTA_OK; |
1184 | ||
1185 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1186 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1187 | !ignore_hardlimit(dquot)) { |
8e893469 | 1188 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1189 | return NO_QUOTA; |
1190 | } | |
1191 | ||
1192 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1193 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1194 | dquot->dq_dqb.dqb_itime && | |
1195 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1196 | !ignore_hardlimit(dquot)) { |
8e893469 | 1197 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1198 | return NO_QUOTA; |
1199 | } | |
1200 | ||
1201 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1202 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1203 | dquot->dq_dqb.dqb_itime == 0) { |
8e893469 | 1204 | *warntype = QUOTA_NL_ISOFTWARN; |
268157ba JK |
1205 | dquot->dq_dqb.dqb_itime = get_seconds() + |
1206 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; | |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | return QUOTA_OK; | |
1210 | } | |
1211 | ||
1212 | /* needs dq_data_lock */ | |
1213 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1214 | { | |
f18df228 | 1215 | qsize_t tspace; |
268157ba | 1216 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1217 | |
8e893469 | 1218 | *warntype = QUOTA_NL_NOWARN; |
268157ba | 1219 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || |
f55abc0f | 1220 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
1da177e4 LT |
1221 | return QUOTA_OK; |
1222 | ||
f18df228 MC |
1223 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1224 | + space; | |
1225 | ||
1da177e4 | 1226 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1227 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1228 | !ignore_hardlimit(dquot)) { |
1229 | if (!prealloc) | |
8e893469 | 1230 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1231 | return NO_QUOTA; |
1232 | } | |
1233 | ||
1234 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1235 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1236 | dquot->dq_dqb.dqb_btime && |
1237 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1238 | !ignore_hardlimit(dquot)) { |
1239 | if (!prealloc) | |
8e893469 | 1240 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1241 | return NO_QUOTA; |
1242 | } | |
1243 | ||
1244 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1245 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1246 | dquot->dq_dqb.dqb_btime == 0) { |
1247 | if (!prealloc) { | |
8e893469 | 1248 | *warntype = QUOTA_NL_BSOFTWARN; |
268157ba JK |
1249 | dquot->dq_dqb.dqb_btime = get_seconds() + |
1250 | sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; | |
1da177e4 LT |
1251 | } |
1252 | else | |
1253 | /* | |
1254 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1255 | * be always printed | |
1256 | */ | |
1257 | return NO_QUOTA; | |
1258 | } | |
1259 | ||
1260 | return QUOTA_OK; | |
1261 | } | |
1262 | ||
12095460 | 1263 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1264 | { |
268157ba JK |
1265 | qsize_t newinodes; |
1266 | ||
657d3bfa | 1267 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f JK |
1268 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1269 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1270 | return QUOTA_NL_NOWARN; |
1271 | ||
268157ba JK |
1272 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1273 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1274 | return QUOTA_NL_ISOFTBELOW; |
1275 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1276 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1277 | return QUOTA_NL_IHARDBELOW; |
1278 | return QUOTA_NL_NOWARN; | |
1279 | } | |
1280 | ||
1281 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1282 | { | |
1283 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1284 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1285 | return QUOTA_NL_NOWARN; |
1286 | ||
12095460 | 1287 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1288 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1289 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1290 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1291 | return QUOTA_NL_BHARDBELOW; |
1292 | return QUOTA_NL_NOWARN; | |
1293 | } | |
0a5a9c72 | 1294 | |
1da177e4 LT |
1295 | /* |
1296 | * Initialize quota pointers in inode | |
cc33412f JK |
1297 | * We do things in a bit complicated way but by that we avoid calling |
1298 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1da177e4 LT |
1299 | */ |
1300 | int dquot_initialize(struct inode *inode, int type) | |
1301 | { | |
1302 | unsigned int id = 0; | |
1303 | int cnt, ret = 0; | |
ad1e6e8d | 1304 | struct dquot *got[MAXQUOTAS]; |
cc33412f | 1305 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1306 | qsize_t rsv; |
1da177e4 | 1307 | |
d3be915f IM |
1308 | /* First test before acquiring mutex - solves deadlocks when we |
1309 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1310 | if (IS_NOQUOTA(inode)) |
1311 | return 0; | |
cc33412f JK |
1312 | |
1313 | /* First get references to structures we might need. */ | |
1314 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
ad1e6e8d | 1315 | got[cnt] = NULL; |
cc33412f JK |
1316 | if (type != -1 && cnt != type) |
1317 | continue; | |
1318 | switch (cnt) { | |
1319 | case USRQUOTA: | |
1320 | id = inode->i_uid; | |
1321 | break; | |
1322 | case GRPQUOTA: | |
1323 | id = inode->i_gid; | |
1324 | break; | |
1325 | } | |
1326 | got[cnt] = dqget(sb, id, cnt); | |
1327 | } | |
1328 | ||
1329 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1330 | if (IS_NOQUOTA(inode)) |
1331 | goto out_err; | |
1332 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1333 | if (type != -1 && cnt != type) | |
1334 | continue; | |
cc33412f JK |
1335 | /* Avoid races with quotaoff() */ |
1336 | if (!sb_has_quota_active(sb, cnt)) | |
1337 | continue; | |
dd6f3c6d | 1338 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1339 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1340 | got[cnt] = NULL; |
0a5a9c72 JK |
1341 | /* |
1342 | * Make quota reservation system happy if someone | |
1343 | * did a write before quota was turned on | |
1344 | */ | |
1345 | rsv = inode_get_rsv_space(inode); | |
1346 | if (unlikely(rsv)) | |
1347 | dquot_resv_space(inode->i_dquot[cnt], rsv); | |
1da177e4 LT |
1348 | } |
1349 | } | |
1350 | out_err: | |
cc33412f JK |
1351 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1352 | /* Drop unused references */ | |
dc52dd3a | 1353 | dqput_all(got); |
1da177e4 LT |
1354 | return ret; |
1355 | } | |
08d0350c | 1356 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1357 | |
1358 | /* | |
1359 | * Release all quotas referenced by inode | |
1da177e4 | 1360 | */ |
9f754758 | 1361 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1362 | { |
1363 | int cnt; | |
cc33412f | 1364 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1365 | |
cc33412f | 1366 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1367 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1368 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1369 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1370 | } |
1371 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1372 | dqput_all(put); |
1da177e4 LT |
1373 | } |
1374 | ||
9f754758 CH |
1375 | void dquot_drop(struct inode *inode) |
1376 | { | |
1377 | int cnt; | |
1378 | ||
1379 | if (IS_NOQUOTA(inode)) | |
1380 | return; | |
1381 | ||
1382 | /* | |
1383 | * Test before calling to rule out calls from proc and such | |
1384 | * where we are not allowed to block. Note that this is | |
1385 | * actually reliable test even without the lock - the caller | |
1386 | * must assure that nobody can come after the DQUOT_DROP and | |
1387 | * add quota pointers back anyway. | |
1388 | */ | |
1389 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1390 | if (inode->i_dquot[cnt]) | |
1391 | break; | |
1392 | } | |
1393 | ||
1394 | if (cnt < MAXQUOTAS) | |
1395 | __dquot_drop(inode); | |
1396 | } | |
1397 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1398 | |
fd8fbfc1 DM |
1399 | /* |
1400 | * inode_reserved_space is managed internally by quota, and protected by | |
1401 | * i_lock similar to i_blocks+i_bytes. | |
1402 | */ | |
1403 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1404 | { | |
1405 | /* Filesystem must explicitly define it's own method in order to use | |
1406 | * quota reservation interface */ | |
1407 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1408 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1409 | } | |
1410 | ||
c469070a | 1411 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1412 | { |
1413 | spin_lock(&inode->i_lock); | |
1414 | *inode_reserved_space(inode) += number; | |
1415 | spin_unlock(&inode->i_lock); | |
1416 | } | |
c469070a | 1417 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1418 | |
c469070a | 1419 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1420 | { |
1421 | spin_lock(&inode->i_lock); | |
1422 | *inode_reserved_space(inode) -= number; | |
1423 | __inode_add_bytes(inode, number); | |
1424 | spin_unlock(&inode->i_lock); | |
1425 | } | |
c469070a | 1426 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1427 | |
c469070a | 1428 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1429 | { |
1430 | spin_lock(&inode->i_lock); | |
1431 | *inode_reserved_space(inode) -= number; | |
1432 | spin_unlock(&inode->i_lock); | |
1433 | } | |
c469070a | 1434 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1435 | |
1436 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1437 | { | |
1438 | qsize_t ret; | |
05b5d898 JK |
1439 | |
1440 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1441 | return 0; | |
fd8fbfc1 DM |
1442 | spin_lock(&inode->i_lock); |
1443 | ret = *inode_reserved_space(inode); | |
1444 | spin_unlock(&inode->i_lock); | |
1445 | return ret; | |
1446 | } | |
1447 | ||
1448 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1449 | int reserve) | |
1450 | { | |
1451 | if (reserve) | |
1452 | inode_add_rsv_space(inode, number); | |
1453 | else | |
1454 | inode_add_bytes(inode, number); | |
1455 | } | |
1456 | ||
1457 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1458 | { | |
1459 | if (reserve) | |
1460 | inode_sub_rsv_space(inode, number); | |
1461 | else | |
1462 | inode_sub_bytes(inode, number); | |
1463 | } | |
1464 | ||
1da177e4 | 1465 | /* |
5dd4056d CH |
1466 | * This functions updates i_blocks+i_bytes fields and quota information |
1467 | * (together with appropriate checks). | |
1468 | * | |
1469 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1470 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1471 | * the current transaction so that dquot write and inode write go into the | |
1472 | * same transaction. | |
1da177e4 LT |
1473 | */ |
1474 | ||
1475 | /* | |
1476 | * This operation can block, but only after everything is updated | |
1477 | */ | |
f18df228 | 1478 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
5dd4056d | 1479 | int warn, int reserve) |
1da177e4 | 1480 | { |
5dd4056d | 1481 | int cnt, ret = 0; |
1da177e4 LT |
1482 | char warntype[MAXQUOTAS]; |
1483 | ||
fd8fbfc1 DM |
1484 | /* |
1485 | * First test before acquiring mutex - solves deadlocks when we | |
1486 | * re-enter the quota code and are already holding the mutex | |
1487 | */ | |
5dd4056d | 1488 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 DM |
1489 | inode_incr_space(inode, number, reserve); |
1490 | goto out; | |
1491 | } | |
1492 | ||
1493 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1da177e4 | 1494 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1495 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1496 | |
1da177e4 LT |
1497 | spin_lock(&dq_data_lock); |
1498 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1499 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1500 | continue; |
5dd4056d CH |
1501 | if (check_bdq(inode->i_dquot[cnt], number, !warn, warntype+cnt) |
1502 | == NO_QUOTA) { | |
1503 | ret = -EDQUOT; | |
fd8fbfc1 DM |
1504 | spin_unlock(&dq_data_lock); |
1505 | goto out_flush_warn; | |
f18df228 | 1506 | } |
1da177e4 LT |
1507 | } |
1508 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1509 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1510 | continue; |
f18df228 MC |
1511 | if (reserve) |
1512 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1513 | else | |
1514 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1515 | } |
fd8fbfc1 | 1516 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1517 | spin_unlock(&dq_data_lock); |
f18df228 | 1518 | |
fd8fbfc1 DM |
1519 | if (reserve) |
1520 | goto out_flush_warn; | |
dc52dd3a | 1521 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 DM |
1522 | out_flush_warn: |
1523 | flush_warnings(inode->i_dquot, warntype); | |
1da177e4 | 1524 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1525 | out: |
1526 | return ret; | |
1527 | } | |
5dd4056d | 1528 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1529 | |
1530 | /* | |
1531 | * This operation can block, but only after everything is updated | |
1532 | */ | |
63936dda | 1533 | int dquot_alloc_inode(const struct inode *inode) |
1da177e4 | 1534 | { |
63936dda | 1535 | int cnt, ret = -EDQUOT; |
1da177e4 LT |
1536 | char warntype[MAXQUOTAS]; |
1537 | ||
d3be915f IM |
1538 | /* First test before acquiring mutex - solves deadlocks when we |
1539 | * re-enter the quota code and are already holding the mutex */ | |
63936dda CH |
1540 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1541 | return 0; | |
1da177e4 | 1542 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1543 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1544 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1545 | spin_lock(&dq_data_lock); |
1546 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1547 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1548 | continue; |
63936dda | 1549 | if (check_idq(inode->i_dquot[cnt], 1, warntype+cnt) |
268157ba | 1550 | == NO_QUOTA) |
1da177e4 LT |
1551 | goto warn_put_all; |
1552 | } | |
1553 | ||
1554 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1555 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1556 | continue; |
63936dda | 1557 | dquot_incr_inodes(inode->i_dquot[cnt], 1); |
1da177e4 | 1558 | } |
63936dda | 1559 | ret = 0; |
1da177e4 LT |
1560 | warn_put_all: |
1561 | spin_unlock(&dq_data_lock); | |
63936dda | 1562 | if (ret == 0) |
dc52dd3a | 1563 | mark_all_dquot_dirty(inode->i_dquot); |
087ee8d5 | 1564 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1565 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1566 | return ret; | |
1567 | } | |
08d0350c | 1568 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1569 | |
5dd4056d CH |
1570 | /* |
1571 | * Convert in-memory reserved quotas to real consumed quotas | |
1572 | */ | |
1573 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd MC |
1574 | { |
1575 | int cnt; | |
740d9dcd | 1576 | |
5dd4056d | 1577 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1578 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1579 | return 0; |
740d9dcd MC |
1580 | } |
1581 | ||
1582 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
740d9dcd MC |
1583 | spin_lock(&dq_data_lock); |
1584 | /* Claim reserved quotas to allocated quotas */ | |
1585 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1586 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1587 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1588 | number); | |
1589 | } | |
1590 | /* Update inode bytes */ | |
fd8fbfc1 | 1591 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1592 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1593 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd | 1594 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
5dd4056d | 1595 | return 0; |
740d9dcd | 1596 | } |
5dd4056d | 1597 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1598 | |
1da177e4 LT |
1599 | /* |
1600 | * This operation can block, but only after everything is updated | |
1601 | */ | |
5dd4056d | 1602 | void __dquot_free_space(struct inode *inode, qsize_t number, int reserve) |
1da177e4 LT |
1603 | { |
1604 | unsigned int cnt; | |
657d3bfa | 1605 | char warntype[MAXQUOTAS]; |
1da177e4 | 1606 | |
d3be915f IM |
1607 | /* First test before acquiring mutex - solves deadlocks when we |
1608 | * re-enter the quota code and are already holding the mutex */ | |
5dd4056d | 1609 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1610 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1611 | return; |
1da177e4 | 1612 | } |
657d3bfa | 1613 | |
1da177e4 | 1614 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1615 | spin_lock(&dq_data_lock); |
1616 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1617 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1618 | continue; |
657d3bfa | 1619 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
fd8fbfc1 DM |
1620 | if (reserve) |
1621 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1622 | else | |
1623 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1624 | } |
fd8fbfc1 | 1625 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1626 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1627 | |
1628 | if (reserve) | |
1629 | goto out_unlock; | |
dc52dd3a | 1630 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 | 1631 | out_unlock: |
657d3bfa | 1632 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1633 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
fd8fbfc1 | 1634 | } |
5dd4056d | 1635 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1636 | |
1da177e4 LT |
1637 | /* |
1638 | * This operation can block, but only after everything is updated | |
1639 | */ | |
63936dda | 1640 | void dquot_free_inode(const struct inode *inode) |
1da177e4 LT |
1641 | { |
1642 | unsigned int cnt; | |
657d3bfa | 1643 | char warntype[MAXQUOTAS]; |
1da177e4 | 1644 | |
d3be915f IM |
1645 | /* First test before acquiring mutex - solves deadlocks when we |
1646 | * re-enter the quota code and are already holding the mutex */ | |
63936dda CH |
1647 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1648 | return; | |
657d3bfa | 1649 | |
1da177e4 | 1650 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1651 | spin_lock(&dq_data_lock); |
1652 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1653 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1654 | continue; |
63936dda CH |
1655 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); |
1656 | dquot_decr_inodes(inode->i_dquot[cnt], 1); | |
1da177e4 LT |
1657 | } |
1658 | spin_unlock(&dq_data_lock); | |
dc52dd3a | 1659 | mark_all_dquot_dirty(inode->i_dquot); |
657d3bfa | 1660 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1661 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1662 | } |
08d0350c | 1663 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1664 | |
1665 | /* | |
1666 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1667 | * | |
1668 | * This operation can block, but only after everything is updated | |
1669 | * A transaction must be started when entering this function. | |
1670 | */ | |
b43fa828 | 1671 | static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask) |
1da177e4 | 1672 | { |
740d9dcd MC |
1673 | qsize_t space, cur_space; |
1674 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1675 | struct dquot *transfer_from[MAXQUOTAS]; |
1676 | struct dquot *transfer_to[MAXQUOTAS]; | |
cc33412f | 1677 | int cnt, ret = QUOTA_OK; |
657d3bfa JK |
1678 | char warntype_to[MAXQUOTAS]; |
1679 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1680 | |
d3be915f IM |
1681 | /* First test before acquiring mutex - solves deadlocks when we |
1682 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1683 | if (IS_NOQUOTA(inode)) |
1684 | return QUOTA_OK; | |
cc33412f | 1685 | /* Initialize the arrays */ |
1da177e4 | 1686 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
dd6f3c6d JK |
1687 | transfer_from[cnt] = NULL; |
1688 | transfer_to[cnt] = NULL; | |
657d3bfa | 1689 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1690 | } |
8ddd69d6 DM |
1691 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1692 | if (mask & (1 << cnt)) | |
1693 | transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt); | |
1694 | } | |
cc33412f | 1695 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
cc33412f JK |
1696 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
1697 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1698 | goto put_all; | |
1699 | } | |
1da177e4 | 1700 | spin_lock(&dq_data_lock); |
740d9dcd | 1701 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1702 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1703 | space = cur_space + rsv_space; |
1da177e4 LT |
1704 | /* Build the transfer_from list and check the limits */ |
1705 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1706 | if (!transfer_to[cnt]) |
1da177e4 LT |
1707 | continue; |
1708 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
657d3bfa JK |
1709 | if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == |
1710 | NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, | |
1711 | warntype_to + cnt) == NO_QUOTA) | |
cc33412f | 1712 | goto over_quota; |
1da177e4 LT |
1713 | } |
1714 | ||
1715 | /* | |
1716 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1717 | */ | |
1718 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1719 | /* | |
1720 | * Skip changes for same uid or gid or for turned off quota-type. | |
1721 | */ | |
dd6f3c6d | 1722 | if (!transfer_to[cnt]) |
1da177e4 LT |
1723 | continue; |
1724 | ||
1725 | /* Due to IO error we might not have transfer_from[] structure */ | |
1726 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1727 | warntype_from_inodes[cnt] = |
1728 | info_idq_free(transfer_from[cnt], 1); | |
1729 | warntype_from_space[cnt] = | |
1730 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1731 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1732 | dquot_decr_space(transfer_from[cnt], cur_space); |
1733 | dquot_free_reserved_space(transfer_from[cnt], | |
1734 | rsv_space); | |
1da177e4 LT |
1735 | } |
1736 | ||
1737 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1738 | dquot_incr_space(transfer_to[cnt], cur_space); |
1739 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1740 | |
1741 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1742 | } | |
1da177e4 | 1743 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1744 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1745 | ||
dc52dd3a DM |
1746 | mark_all_dquot_dirty(transfer_from); |
1747 | mark_all_dquot_dirty(transfer_to); | |
1748 | /* The reference we got is transferred to the inode */ | |
1749 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1750 | transfer_to[cnt] = NULL; | |
cc33412f | 1751 | warn_put_all: |
657d3bfa JK |
1752 | flush_warnings(transfer_to, warntype_to); |
1753 | flush_warnings(transfer_from, warntype_from_inodes); | |
1754 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1755 | put_all: |
dc52dd3a DM |
1756 | dqput_all(transfer_from); |
1757 | dqput_all(transfer_to); | |
1da177e4 | 1758 | return ret; |
cc33412f JK |
1759 | over_quota: |
1760 | spin_unlock(&dq_data_lock); | |
1761 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1762 | /* Clear dquot pointers we don't want to dqput() */ | |
1763 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1764 | transfer_from[cnt] = NULL; |
cc33412f JK |
1765 | ret = NO_QUOTA; |
1766 | goto warn_put_all; | |
1da177e4 LT |
1767 | } |
1768 | ||
8ddd69d6 DM |
1769 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1770 | * Called from FSXXX_setattr() | |
1771 | */ | |
b43fa828 | 1772 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1773 | { |
8ddd69d6 DM |
1774 | qid_t chid[MAXQUOTAS]; |
1775 | unsigned long mask = 0; | |
1776 | ||
1777 | if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) { | |
1778 | mask |= 1 << USRQUOTA; | |
1779 | chid[USRQUOTA] = iattr->ia_uid; | |
1780 | } | |
1781 | if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) { | |
1782 | mask |= 1 << GRPQUOTA; | |
1783 | chid[GRPQUOTA] = iattr->ia_gid; | |
1784 | } | |
f55abc0f | 1785 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
b85f4b87 | 1786 | vfs_dq_init(inode); |
b43fa828 CH |
1787 | if (__dquot_transfer(inode, chid, mask) == NO_QUOTA) |
1788 | return -EDQUOT; | |
b85f4b87 JK |
1789 | } |
1790 | return 0; | |
1791 | } | |
b43fa828 | 1792 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 1793 | |
1da177e4 LT |
1794 | /* |
1795 | * Write info of quota file to disk | |
1796 | */ | |
1797 | int dquot_commit_info(struct super_block *sb, int type) | |
1798 | { | |
1799 | int ret; | |
1800 | struct quota_info *dqopt = sb_dqopt(sb); | |
1801 | ||
d3be915f | 1802 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1803 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1804 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1805 | return ret; |
1806 | } | |
08d0350c | 1807 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1808 | |
1809 | /* | |
1810 | * Definitions of diskquota operations. | |
1811 | */ | |
61e225dc | 1812 | const struct dquot_operations dquot_operations = { |
1da177e4 | 1813 | .initialize = dquot_initialize, |
1da177e4 LT |
1814 | .write_dquot = dquot_commit, |
1815 | .acquire_dquot = dquot_acquire, | |
1816 | .release_dquot = dquot_release, | |
1817 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1818 | .write_info = dquot_commit_info, |
1819 | .alloc_dquot = dquot_alloc, | |
1820 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1821 | }; |
1822 | ||
907f4554 CH |
1823 | /* |
1824 | * Generic helper for ->open on filesystems supporting disk quotas. | |
1825 | */ | |
1826 | int dquot_file_open(struct inode *inode, struct file *file) | |
1827 | { | |
1828 | int error; | |
1829 | ||
1830 | error = generic_file_open(inode, file); | |
1831 | if (!error && (file->f_mode & FMODE_WRITE)) | |
1832 | vfs_dq_init(inode); | |
1833 | return error; | |
1834 | } | |
1835 | EXPORT_SYMBOL(dquot_file_open); | |
1836 | ||
1da177e4 LT |
1837 | /* |
1838 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1839 | */ | |
f55abc0f | 1840 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1841 | { |
0ff5af83 | 1842 | int cnt, ret = 0; |
1da177e4 LT |
1843 | struct quota_info *dqopt = sb_dqopt(sb); |
1844 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1845 | |
f55abc0f JK |
1846 | /* Cannot turn off usage accounting without turning off limits, or |
1847 | * suspend quotas and simultaneously turn quotas off. */ | |
1848 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1849 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1850 | DQUOT_USAGE_ENABLED))) | |
1851 | return -EINVAL; | |
1852 | ||
1da177e4 | 1853 | /* We need to serialize quota_off() for device */ |
d3be915f | 1854 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1855 | |
1856 | /* | |
1857 | * Skip everything if there's nothing to do. We have to do this because | |
1858 | * sometimes we are called when fill_super() failed and calling | |
1859 | * sync_fs() in such cases does no good. | |
1860 | */ | |
f55abc0f | 1861 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1862 | mutex_unlock(&dqopt->dqonoff_mutex); |
1863 | return 0; | |
1864 | } | |
1da177e4 LT |
1865 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1866 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1867 | if (type != -1 && cnt != type) |
1868 | continue; | |
f55abc0f | 1869 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1870 | continue; |
f55abc0f JK |
1871 | |
1872 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1873 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1874 | dqopt->flags |= |
1875 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1876 | spin_unlock(&dq_state_lock); |
f55abc0f | 1877 | } else { |
cc33412f | 1878 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1879 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1880 | /* Turning off suspended quotas? */ | |
1881 | if (!sb_has_quota_loaded(sb, cnt) && | |
1882 | sb_has_quota_suspended(sb, cnt)) { | |
1883 | dqopt->flags &= ~dquot_state_flag( | |
1884 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1885 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1886 | iput(dqopt->files[cnt]); |
1887 | dqopt->files[cnt] = NULL; | |
1888 | continue; | |
1889 | } | |
cc33412f | 1890 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1891 | } |
f55abc0f JK |
1892 | |
1893 | /* We still have to keep quota loaded? */ | |
1894 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1895 | continue; |
1da177e4 LT |
1896 | |
1897 | /* Note: these are blocking operations */ | |
1898 | drop_dquot_ref(sb, cnt); | |
1899 | invalidate_dquots(sb, cnt); | |
1900 | /* | |
268157ba JK |
1901 | * Now all dquots should be invalidated, all writes done so we |
1902 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
1903 | */ |
1904 | if (info_dirty(&dqopt->info[cnt])) | |
1905 | sb->dq_op->write_info(sb, cnt); | |
1906 | if (dqopt->ops[cnt]->free_file_info) | |
1907 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1908 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1909 | ||
1910 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1911 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1912 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1913 | dqopt->info[cnt].dqi_flags = 0; |
1914 | dqopt->info[cnt].dqi_igrace = 0; | |
1915 | dqopt->info[cnt].dqi_bgrace = 0; | |
1916 | dqopt->ops[cnt] = NULL; | |
1917 | } | |
d3be915f | 1918 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1919 | |
1920 | /* Skip syncing and setting flags if quota files are hidden */ | |
1921 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1922 | goto put_inodes; | |
1923 | ||
1da177e4 | 1924 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1925 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1926 | if (sb->s_op->sync_fs) |
1927 | sb->s_op->sync_fs(sb, 1); | |
1928 | sync_blockdev(sb->s_bdev); | |
1929 | /* Now the quota files are just ordinary files and we can set the | |
1930 | * inode flags back. Moreover we discard the pagecache so that | |
1931 | * userspace sees the writes we did bypassing the pagecache. We | |
1932 | * must also discard the blockdev buffers so that we see the | |
1933 | * changes done by userspace on the next quotaon() */ | |
1934 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1935 | if (toputinode[cnt]) { | |
d3be915f | 1936 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1937 | /* If quota was reenabled in the meantime, we have |
1938 | * nothing to do */ | |
f55abc0f | 1939 | if (!sb_has_quota_loaded(sb, cnt)) { |
268157ba JK |
1940 | mutex_lock_nested(&toputinode[cnt]->i_mutex, |
1941 | I_MUTEX_QUOTA); | |
1da177e4 LT |
1942 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1943 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
1944 | truncate_inode_pages(&toputinode[cnt]->i_data, |
1945 | 0); | |
1b1dcc1b | 1946 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1947 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1948 | } |
d3be915f | 1949 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1950 | } |
1951 | if (sb->s_bdev) | |
1952 | invalidate_bdev(sb->s_bdev); | |
1953 | put_inodes: | |
1954 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1955 | if (toputinode[cnt]) { | |
0ff5af83 | 1956 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1957 | * can reenable quota on the subsequent remount RW. We |
1958 | * have to check 'flags' variable and not use sb_has_ | |
1959 | * function because another quotaon / quotaoff could | |
1960 | * change global state before we got here. We refuse | |
1961 | * to suspend quotas when there is pending delete on | |
1962 | * the quota file... */ | |
1963 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1964 | iput(toputinode[cnt]); |
1965 | else if (!toputinode[cnt]->i_nlink) | |
1966 | ret = -EBUSY; | |
1da177e4 | 1967 | } |
0ff5af83 | 1968 | return ret; |
1da177e4 | 1969 | } |
08d0350c | 1970 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 1971 | |
f55abc0f JK |
1972 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1973 | { | |
1974 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1975 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1976 | } | |
08d0350c | 1977 | EXPORT_SYMBOL(vfs_quota_off); |
1da177e4 LT |
1978 | /* |
1979 | * Turn quotas on on a device | |
1980 | */ | |
1981 | ||
f55abc0f JK |
1982 | /* |
1983 | * Helper function to turn quotas on when we already have the inode of | |
1984 | * quota file and no quota information is loaded. | |
1985 | */ | |
1986 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1987 | unsigned int flags) | |
1da177e4 LT |
1988 | { |
1989 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1990 | struct super_block *sb = inode->i_sb; | |
1991 | struct quota_info *dqopt = sb_dqopt(sb); | |
1992 | int error; | |
1993 | int oldflags = -1; | |
1994 | ||
1995 | if (!fmt) | |
1996 | return -ESRCH; | |
1997 | if (!S_ISREG(inode->i_mode)) { | |
1998 | error = -EACCES; | |
1999 | goto out_fmt; | |
2000 | } | |
2001 | if (IS_RDONLY(inode)) { | |
2002 | error = -EROFS; | |
2003 | goto out_fmt; | |
2004 | } | |
2005 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
2006 | error = -EINVAL; | |
2007 | goto out_fmt; | |
2008 | } | |
f55abc0f JK |
2009 | /* Usage always has to be set... */ |
2010 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2011 | error = -EINVAL; | |
2012 | goto out_fmt; | |
2013 | } | |
1da177e4 | 2014 | |
ca785ec6 | 2015 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2016 | /* As we bypass the pagecache we must now flush all the |
2017 | * dirty data and invalidate caches so that kernel sees | |
2018 | * changes from userspace. It is not enough to just flush | |
2019 | * the quota file since if blocksize < pagesize, invalidation | |
2020 | * of the cache could fail because of other unrelated dirty | |
2021 | * data */ | |
2022 | sync_filesystem(sb); | |
ca785ec6 JK |
2023 | invalidate_bdev(sb->s_bdev); |
2024 | } | |
d3be915f | 2025 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2026 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2027 | error = -EBUSY; |
2028 | goto out_lock; | |
2029 | } | |
ca785ec6 JK |
2030 | |
2031 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2032 | /* We don't want quota and atime on quota files (deadlocks | |
2033 | * possible) Also nobody should write to the file - we use | |
2034 | * special IO operations which ignore the immutable bit. */ | |
dee86565 | 2035 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
268157ba JK |
2036 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2037 | S_NOQUOTA); | |
ca785ec6 | 2038 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2039 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
2040 | /* |
2041 | * When S_NOQUOTA is set, remove dquot references as no more | |
2042 | * references can be added | |
2043 | */ | |
9f754758 | 2044 | __dquot_drop(inode); |
ca785ec6 | 2045 | } |
1da177e4 LT |
2046 | |
2047 | error = -EIO; | |
2048 | dqopt->files[type] = igrab(inode); | |
2049 | if (!dqopt->files[type]) | |
2050 | goto out_lock; | |
2051 | error = -EINVAL; | |
2052 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2053 | goto out_file_init; | |
2054 | ||
2055 | dqopt->ops[type] = fmt->qf_ops; | |
2056 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2057 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2058 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2059 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2060 | error = dqopt->ops[type]->read_file_info(sb, type); |
2061 | if (error < 0) { | |
d3be915f | 2062 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2063 | goto out_file_init; |
2064 | } | |
d3be915f | 2065 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2066 | spin_lock(&dq_state_lock); |
f55abc0f | 2067 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2068 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2069 | |
2070 | add_dquot_ref(sb, type); | |
d3be915f | 2071 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2072 | |
2073 | return 0; | |
2074 | ||
2075 | out_file_init: | |
2076 | dqopt->files[type] = NULL; | |
2077 | iput(inode); | |
2078 | out_lock: | |
1da177e4 | 2079 | if (oldflags != -1) { |
dee86565 | 2080 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2081 | /* Set the flags back (in the case of accidental quotaon() |
2082 | * on a wrong file we don't want to mess up the flags) */ | |
2083 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2084 | inode->i_flags |= oldflags; | |
dee86565 | 2085 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2086 | } |
d01730d7 | 2087 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2088 | out_fmt: |
2089 | put_quota_format(fmt); | |
2090 | ||
2091 | return error; | |
2092 | } | |
2093 | ||
0ff5af83 JK |
2094 | /* Reenable quotas on remount RW */ |
2095 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2096 | { | |
2097 | struct quota_info *dqopt = sb_dqopt(sb); | |
2098 | struct inode *inode; | |
2099 | int ret; | |
f55abc0f | 2100 | unsigned int flags; |
0ff5af83 JK |
2101 | |
2102 | mutex_lock(&dqopt->dqonoff_mutex); | |
2103 | if (!sb_has_quota_suspended(sb, type)) { | |
2104 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2105 | return 0; | |
2106 | } | |
0ff5af83 JK |
2107 | inode = dqopt->files[type]; |
2108 | dqopt->files[type] = NULL; | |
cc33412f | 2109 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2110 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2111 | DQUOT_LIMITS_ENABLED, type); | |
2112 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2113 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2114 | mutex_unlock(&dqopt->dqonoff_mutex); |
2115 | ||
f55abc0f JK |
2116 | flags = dquot_generic_flag(flags, type); |
2117 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2118 | flags); | |
0ff5af83 JK |
2119 | iput(inode); |
2120 | ||
2121 | return ret; | |
2122 | } | |
2123 | ||
77e69dac AV |
2124 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2125 | struct path *path) | |
2126 | { | |
2127 | int error = security_quota_on(path->dentry); | |
2128 | if (error) | |
2129 | return error; | |
2130 | /* Quota file not on the same filesystem? */ | |
2131 | if (path->mnt->mnt_sb != sb) | |
2132 | error = -EXDEV; | |
2133 | else | |
f55abc0f JK |
2134 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2135 | format_id, DQUOT_USAGE_ENABLED | | |
2136 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2137 | return error; |
2138 | } | |
08d0350c | 2139 | EXPORT_SYMBOL(vfs_quota_on_path); |
77e69dac | 2140 | |
8264613d | 2141 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2142 | int remount) |
1da177e4 | 2143 | { |
8264613d | 2144 | struct path path; |
1da177e4 LT |
2145 | int error; |
2146 | ||
0ff5af83 JK |
2147 | if (remount) |
2148 | return vfs_quota_on_remount(sb, type); | |
2149 | ||
8264613d | 2150 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2151 | if (!error) { |
8264613d AV |
2152 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2153 | path_put(&path); | |
77e69dac | 2154 | } |
1da177e4 LT |
2155 | return error; |
2156 | } | |
08d0350c | 2157 | EXPORT_SYMBOL(vfs_quota_on); |
1da177e4 | 2158 | |
f55abc0f JK |
2159 | /* |
2160 | * More powerful function for turning on quotas allowing setting | |
2161 | * of individual quota flags | |
2162 | */ | |
2163 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2164 | unsigned int flags) | |
2165 | { | |
2166 | int ret = 0; | |
2167 | struct super_block *sb = inode->i_sb; | |
2168 | struct quota_info *dqopt = sb_dqopt(sb); | |
2169 | ||
2170 | /* Just unsuspend quotas? */ | |
2171 | if (flags & DQUOT_SUSPENDED) | |
2172 | return vfs_quota_on_remount(sb, type); | |
2173 | if (!flags) | |
2174 | return 0; | |
2175 | /* Just updating flags needed? */ | |
2176 | if (sb_has_quota_loaded(sb, type)) { | |
2177 | mutex_lock(&dqopt->dqonoff_mutex); | |
2178 | /* Now do a reliable test... */ | |
2179 | if (!sb_has_quota_loaded(sb, type)) { | |
2180 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2181 | goto load_quota; | |
2182 | } | |
2183 | if (flags & DQUOT_USAGE_ENABLED && | |
2184 | sb_has_quota_usage_enabled(sb, type)) { | |
2185 | ret = -EBUSY; | |
2186 | goto out_lock; | |
2187 | } | |
2188 | if (flags & DQUOT_LIMITS_ENABLED && | |
2189 | sb_has_quota_limits_enabled(sb, type)) { | |
2190 | ret = -EBUSY; | |
2191 | goto out_lock; | |
2192 | } | |
cc33412f | 2193 | spin_lock(&dq_state_lock); |
f55abc0f | 2194 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2195 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2196 | out_lock: |
2197 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2198 | return ret; | |
2199 | } | |
2200 | ||
2201 | load_quota: | |
2202 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2203 | } | |
08d0350c | 2204 | EXPORT_SYMBOL(vfs_quota_enable); |
f55abc0f | 2205 | |
1da177e4 LT |
2206 | /* |
2207 | * This function is used when filesystem needs to initialize quotas | |
2208 | * during mount time. | |
2209 | */ | |
84de856e CH |
2210 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2211 | int format_id, int type) | |
1da177e4 | 2212 | { |
84de856e | 2213 | struct dentry *dentry; |
1da177e4 LT |
2214 | int error; |
2215 | ||
c56818d7 | 2216 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2217 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2218 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2219 | if (IS_ERR(dentry)) |
2220 | return PTR_ERR(dentry); | |
2221 | ||
154f484b JK |
2222 | if (!dentry->d_inode) { |
2223 | error = -ENOENT; | |
2224 | goto out; | |
2225 | } | |
2226 | ||
1da177e4 | 2227 | error = security_quota_on(dentry); |
84de856e | 2228 | if (!error) |
f55abc0f JK |
2229 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2230 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2231 | |
154f484b | 2232 | out: |
84de856e CH |
2233 | dput(dentry); |
2234 | return error; | |
1da177e4 | 2235 | } |
08d0350c | 2236 | EXPORT_SYMBOL(vfs_quota_on_mount); |
1da177e4 | 2237 | |
b85f4b87 JK |
2238 | /* Wrapper to turn on quotas when remounting rw */ |
2239 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2240 | { | |
2241 | int cnt; | |
2242 | int ret = 0, err; | |
2243 | ||
2244 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2245 | return -ENOSYS; | |
2246 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2247 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2248 | if (err < 0 && !ret) | |
2249 | ret = err; | |
2250 | } | |
2251 | return ret; | |
2252 | } | |
08d0350c | 2253 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |
b85f4b87 | 2254 | |
12095460 JK |
2255 | static inline qsize_t qbtos(qsize_t blocks) |
2256 | { | |
2257 | return blocks << QIF_DQBLKSIZE_BITS; | |
2258 | } | |
2259 | ||
2260 | static inline qsize_t stoqb(qsize_t space) | |
2261 | { | |
2262 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2263 | } | |
2264 | ||
1da177e4 LT |
2265 | /* Generic routine for getting common part of quota structure */ |
2266 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2267 | { | |
2268 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2269 | ||
2270 | spin_lock(&dq_data_lock); | |
12095460 JK |
2271 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2272 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
f18df228 | 2273 | di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; |
1da177e4 LT |
2274 | di->dqb_ihardlimit = dm->dqb_ihardlimit; |
2275 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2276 | di->dqb_curinodes = dm->dqb_curinodes; | |
2277 | di->dqb_btime = dm->dqb_btime; | |
2278 | di->dqb_itime = dm->dqb_itime; | |
2279 | di->dqb_valid = QIF_ALL; | |
2280 | spin_unlock(&dq_data_lock); | |
2281 | } | |
2282 | ||
268157ba JK |
2283 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, |
2284 | struct if_dqblk *di) | |
1da177e4 LT |
2285 | { |
2286 | struct dquot *dquot; | |
2287 | ||
cc33412f | 2288 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2289 | if (!dquot) |
1da177e4 | 2290 | return -ESRCH; |
1da177e4 LT |
2291 | do_get_dqblk(dquot, di); |
2292 | dqput(dquot); | |
cc33412f | 2293 | |
1da177e4 LT |
2294 | return 0; |
2295 | } | |
08d0350c | 2296 | EXPORT_SYMBOL(vfs_get_dqblk); |
1da177e4 LT |
2297 | |
2298 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2299 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2300 | { |
2301 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2302 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2303 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2304 | ||
2305 | if ((di->dqb_valid & QIF_BLIMITS && | |
2306 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2307 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2308 | (di->dqb_valid & QIF_ILIMITS && | |
2309 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2310 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2311 | return -ERANGE; | |
1da177e4 LT |
2312 | |
2313 | spin_lock(&dq_data_lock); | |
2314 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2315 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2316 | check_blim = 1; |
4d59bce4 | 2317 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2318 | } |
2319 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2320 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2321 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2322 | check_blim = 1; |
4d59bce4 | 2323 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2324 | } |
2325 | if (di->dqb_valid & QIF_INODES) { | |
2326 | dm->dqb_curinodes = di->dqb_curinodes; | |
2327 | check_ilim = 1; | |
4d59bce4 | 2328 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2329 | } |
2330 | if (di->dqb_valid & QIF_ILIMITS) { | |
2331 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2332 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2333 | check_ilim = 1; | |
4d59bce4 | 2334 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2335 | } |
4d59bce4 | 2336 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2337 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2338 | check_blim = 1; |
4d59bce4 JK |
2339 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2340 | } | |
2341 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2342 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2343 | check_ilim = 1; |
4d59bce4 JK |
2344 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2345 | } | |
1da177e4 LT |
2346 | |
2347 | if (check_blim) { | |
268157ba JK |
2348 | if (!dm->dqb_bsoftlimit || |
2349 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2350 | dm->dqb_btime = 0; |
2351 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
268157ba JK |
2352 | } else if (!(di->dqb_valid & QIF_BTIME)) |
2353 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2354 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2355 | } |
2356 | if (check_ilim) { | |
268157ba JK |
2357 | if (!dm->dqb_isoftlimit || |
2358 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2359 | dm->dqb_itime = 0; |
2360 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
268157ba JK |
2361 | } else if (!(di->dqb_valid & QIF_ITIME)) |
2362 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2363 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2364 | } |
268157ba JK |
2365 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2366 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2367 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2368 | else | |
2369 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2370 | spin_unlock(&dq_data_lock); | |
2371 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2372 | |
2373 | return 0; | |
1da177e4 LT |
2374 | } |
2375 | ||
268157ba JK |
2376 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, |
2377 | struct if_dqblk *di) | |
1da177e4 LT |
2378 | { |
2379 | struct dquot *dquot; | |
338bf9af | 2380 | int rc; |
1da177e4 | 2381 | |
f55abc0f JK |
2382 | dquot = dqget(sb, id, type); |
2383 | if (!dquot) { | |
2384 | rc = -ESRCH; | |
2385 | goto out; | |
1da177e4 | 2386 | } |
338bf9af | 2387 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2388 | dqput(dquot); |
f55abc0f | 2389 | out: |
338bf9af | 2390 | return rc; |
1da177e4 | 2391 | } |
08d0350c | 2392 | EXPORT_SYMBOL(vfs_set_dqblk); |
1da177e4 LT |
2393 | |
2394 | /* Generic routine for getting common part of quota file information */ | |
2395 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2396 | { | |
2397 | struct mem_dqinfo *mi; | |
2398 | ||
d3be915f | 2399 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2400 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2401 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2402 | return -ESRCH; |
2403 | } | |
2404 | mi = sb_dqopt(sb)->info + type; | |
2405 | spin_lock(&dq_data_lock); | |
2406 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2407 | ii->dqi_igrace = mi->dqi_igrace; | |
2408 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2409 | ii->dqi_valid = IIF_ALL; | |
2410 | spin_unlock(&dq_data_lock); | |
d3be915f | 2411 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2412 | return 0; |
2413 | } | |
08d0350c | 2414 | EXPORT_SYMBOL(vfs_get_dqinfo); |
1da177e4 LT |
2415 | |
2416 | /* Generic routine for setting common part of quota file information */ | |
2417 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2418 | { | |
2419 | struct mem_dqinfo *mi; | |
f55abc0f | 2420 | int err = 0; |
1da177e4 | 2421 | |
d3be915f | 2422 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2423 | if (!sb_has_quota_active(sb, type)) { |
2424 | err = -ESRCH; | |
2425 | goto out; | |
1da177e4 LT |
2426 | } |
2427 | mi = sb_dqopt(sb)->info + type; | |
2428 | spin_lock(&dq_data_lock); | |
2429 | if (ii->dqi_valid & IIF_BGRACE) | |
2430 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2431 | if (ii->dqi_valid & IIF_IGRACE) | |
2432 | mi->dqi_igrace = ii->dqi_igrace; | |
2433 | if (ii->dqi_valid & IIF_FLAGS) | |
268157ba JK |
2434 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | |
2435 | (ii->dqi_flags & DQF_MASK); | |
1da177e4 LT |
2436 | spin_unlock(&dq_data_lock); |
2437 | mark_info_dirty(sb, type); | |
2438 | /* Force write to disk */ | |
2439 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2440 | out: |
d3be915f | 2441 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2442 | return err; |
1da177e4 | 2443 | } |
08d0350c | 2444 | EXPORT_SYMBOL(vfs_set_dqinfo); |
1da177e4 | 2445 | |
0d54b217 | 2446 | const struct quotactl_ops vfs_quotactl_ops = { |
1da177e4 LT |
2447 | .quota_on = vfs_quota_on, |
2448 | .quota_off = vfs_quota_off, | |
2449 | .quota_sync = vfs_quota_sync, | |
2450 | .get_info = vfs_get_dqinfo, | |
2451 | .set_info = vfs_set_dqinfo, | |
2452 | .get_dqblk = vfs_get_dqblk, | |
2453 | .set_dqblk = vfs_set_dqblk | |
2454 | }; | |
2455 | ||
2456 | static ctl_table fs_dqstats_table[] = { | |
2457 | { | |
1da177e4 LT |
2458 | .procname = "lookups", |
2459 | .data = &dqstats.lookups, | |
2460 | .maxlen = sizeof(int), | |
2461 | .mode = 0444, | |
6d456111 | 2462 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2463 | }, |
2464 | { | |
1da177e4 LT |
2465 | .procname = "drops", |
2466 | .data = &dqstats.drops, | |
2467 | .maxlen = sizeof(int), | |
2468 | .mode = 0444, | |
6d456111 | 2469 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2470 | }, |
2471 | { | |
1da177e4 LT |
2472 | .procname = "reads", |
2473 | .data = &dqstats.reads, | |
2474 | .maxlen = sizeof(int), | |
2475 | .mode = 0444, | |
6d456111 | 2476 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2477 | }, |
2478 | { | |
1da177e4 LT |
2479 | .procname = "writes", |
2480 | .data = &dqstats.writes, | |
2481 | .maxlen = sizeof(int), | |
2482 | .mode = 0444, | |
6d456111 | 2483 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2484 | }, |
2485 | { | |
1da177e4 LT |
2486 | .procname = "cache_hits", |
2487 | .data = &dqstats.cache_hits, | |
2488 | .maxlen = sizeof(int), | |
2489 | .mode = 0444, | |
6d456111 | 2490 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2491 | }, |
2492 | { | |
1da177e4 LT |
2493 | .procname = "allocated_dquots", |
2494 | .data = &dqstats.allocated_dquots, | |
2495 | .maxlen = sizeof(int), | |
2496 | .mode = 0444, | |
6d456111 | 2497 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2498 | }, |
2499 | { | |
1da177e4 LT |
2500 | .procname = "free_dquots", |
2501 | .data = &dqstats.free_dquots, | |
2502 | .maxlen = sizeof(int), | |
2503 | .mode = 0444, | |
6d456111 | 2504 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2505 | }, |
2506 | { | |
1da177e4 LT |
2507 | .procname = "syncs", |
2508 | .data = &dqstats.syncs, | |
2509 | .maxlen = sizeof(int), | |
2510 | .mode = 0444, | |
6d456111 | 2511 | .proc_handler = proc_dointvec, |
1da177e4 | 2512 | }, |
8e893469 | 2513 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2514 | { |
1da177e4 LT |
2515 | .procname = "warnings", |
2516 | .data = &flag_print_warnings, | |
2517 | .maxlen = sizeof(int), | |
2518 | .mode = 0644, | |
6d456111 | 2519 | .proc_handler = proc_dointvec, |
1da177e4 | 2520 | }, |
8e893469 | 2521 | #endif |
ab09203e | 2522 | { }, |
1da177e4 LT |
2523 | }; |
2524 | ||
2525 | static ctl_table fs_table[] = { | |
2526 | { | |
1da177e4 LT |
2527 | .procname = "quota", |
2528 | .mode = 0555, | |
2529 | .child = fs_dqstats_table, | |
2530 | }, | |
ab09203e | 2531 | { }, |
1da177e4 LT |
2532 | }; |
2533 | ||
2534 | static ctl_table sys_table[] = { | |
2535 | { | |
1da177e4 LT |
2536 | .procname = "fs", |
2537 | .mode = 0555, | |
2538 | .child = fs_table, | |
2539 | }, | |
ab09203e | 2540 | { }, |
1da177e4 LT |
2541 | }; |
2542 | ||
2543 | static int __init dquot_init(void) | |
2544 | { | |
2545 | int i; | |
2546 | unsigned long nr_hash, order; | |
2547 | ||
2548 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2549 | ||
0b4d4147 | 2550 | register_sysctl_table(sys_table); |
1da177e4 | 2551 | |
20c2df83 | 2552 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2553 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2554 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2555 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2556 | NULL); |
1da177e4 LT |
2557 | |
2558 | order = 0; | |
2559 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2560 | if (!dquot_hash) | |
2561 | panic("Cannot create dquot hash table"); | |
2562 | ||
2563 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2564 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2565 | dq_hash_bits = 0; | |
2566 | do { | |
2567 | dq_hash_bits++; | |
2568 | } while (nr_hash >> dq_hash_bits); | |
2569 | dq_hash_bits--; | |
2570 | ||
2571 | nr_hash = 1UL << dq_hash_bits; | |
2572 | dq_hash_mask = nr_hash - 1; | |
2573 | for (i = 0; i < nr_hash; i++) | |
2574 | INIT_HLIST_HEAD(dquot_hash + i); | |
2575 | ||
2576 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2577 | nr_hash, order, (PAGE_SIZE << order)); | |
2578 | ||
8e1f936b | 2579 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2580 | |
2581 | return 0; | |
2582 | } | |
2583 | module_init(dquot_init); |