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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
74 | #include <linux/kmod.h> | |
75 | #include <linux/namei.h> | |
76 | #include <linux/buffer_head.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
fb58b731 | 79 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
1da177e4 LT |
80 | |
81 | #include <asm/uaccess.h> | |
82 | ||
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 | |
1da177e4 LT |
232 | static inline unsigned int |
233 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
234 | { | |
235 | unsigned long tmp; | |
236 | ||
237 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
238 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Following list functions expect dq_list_lock to be held | |
243 | */ | |
244 | static inline void insert_dquot_hash(struct dquot *dquot) | |
245 | { | |
268157ba JK |
246 | struct hlist_head *head; |
247 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
1da177e4 LT |
248 | hlist_add_head(&dquot->dq_hash, head); |
249 | } | |
250 | ||
251 | static inline void remove_dquot_hash(struct dquot *dquot) | |
252 | { | |
253 | hlist_del_init(&dquot->dq_hash); | |
254 | } | |
255 | ||
7a2435d8 JK |
256 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
257 | unsigned int id, int type) | |
1da177e4 LT |
258 | { |
259 | struct hlist_node *node; | |
260 | struct dquot *dquot; | |
261 | ||
262 | hlist_for_each (node, dquot_hash+hashent) { | |
263 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
268157ba JK |
264 | if (dquot->dq_sb == sb && dquot->dq_id == id && |
265 | dquot->dq_type == type) | |
1da177e4 LT |
266 | return dquot; |
267 | } | |
dd6f3c6d | 268 | return NULL; |
1da177e4 LT |
269 | } |
270 | ||
271 | /* Add a dquot to the tail of the free list */ | |
272 | static inline void put_dquot_last(struct dquot *dquot) | |
273 | { | |
8e13059a | 274 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
275 | dqstats.free_dquots++; |
276 | } | |
277 | ||
278 | static inline void remove_free_dquot(struct dquot *dquot) | |
279 | { | |
280 | if (list_empty(&dquot->dq_free)) | |
281 | return; | |
282 | list_del_init(&dquot->dq_free); | |
283 | dqstats.free_dquots--; | |
284 | } | |
285 | ||
286 | static inline void put_inuse(struct dquot *dquot) | |
287 | { | |
288 | /* We add to the back of inuse list so we don't have to restart | |
289 | * when traversing this list and we block */ | |
8e13059a | 290 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
291 | dqstats.allocated_dquots++; |
292 | } | |
293 | ||
294 | static inline void remove_inuse(struct dquot *dquot) | |
295 | { | |
296 | dqstats.allocated_dquots--; | |
297 | list_del(&dquot->dq_inuse); | |
298 | } | |
299 | /* | |
300 | * End of list functions needing dq_list_lock | |
301 | */ | |
302 | ||
303 | static void wait_on_dquot(struct dquot *dquot) | |
304 | { | |
d3be915f IM |
305 | mutex_lock(&dquot->dq_lock); |
306 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
307 | } |
308 | ||
03f6e92b JK |
309 | static inline int dquot_dirty(struct dquot *dquot) |
310 | { | |
311 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
312 | } | |
313 | ||
314 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
315 | { | |
316 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
317 | } | |
1da177e4 LT |
318 | |
319 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
320 | { | |
321 | spin_lock(&dq_list_lock); | |
322 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
323 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
324 | info[dquot->dq_type].dqi_dirty_list); | |
325 | spin_unlock(&dq_list_lock); | |
326 | return 0; | |
327 | } | |
08d0350c | 328 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 329 | |
dc52dd3a DM |
330 | /* Dirtify all the dquots - this can block when journalling */ |
331 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
332 | { | |
333 | int ret, err, cnt; | |
334 | ||
335 | ret = err = 0; | |
336 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
337 | if (dquot[cnt]) | |
338 | /* Even in case of error we have to continue */ | |
339 | ret = mark_dquot_dirty(dquot[cnt]); | |
340 | if (!err) | |
341 | err = ret; | |
342 | } | |
343 | return err; | |
344 | } | |
345 | ||
346 | static inline void dqput_all(struct dquot **dquot) | |
347 | { | |
348 | unsigned int cnt; | |
349 | ||
350 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
351 | dqput(dquot[cnt]); | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* This function needs dq_list_lock */ |
355 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
356 | { | |
357 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
358 | return 0; | |
359 | list_del_init(&dquot->dq_dirty); | |
360 | return 1; | |
361 | } | |
362 | ||
363 | void mark_info_dirty(struct super_block *sb, int type) | |
364 | { | |
365 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
366 | } | |
367 | EXPORT_SYMBOL(mark_info_dirty); | |
368 | ||
369 | /* | |
370 | * Read dquot from disk and alloc space for it | |
371 | */ | |
372 | ||
373 | int dquot_acquire(struct dquot *dquot) | |
374 | { | |
375 | int ret = 0, ret2 = 0; | |
376 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
377 | ||
d3be915f IM |
378 | mutex_lock(&dquot->dq_lock); |
379 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
380 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
381 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
382 | if (ret < 0) | |
383 | goto out_iolock; | |
384 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
385 | /* Instantiate dquot if needed */ | |
386 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
387 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
388 | /* Write the info if needed */ | |
268157ba JK |
389 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
390 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
391 | dquot->dq_sb, dquot->dq_type); | |
392 | } | |
1da177e4 LT |
393 | if (ret < 0) |
394 | goto out_iolock; | |
395 | if (ret2 < 0) { | |
396 | ret = ret2; | |
397 | goto out_iolock; | |
398 | } | |
399 | } | |
400 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
401 | out_iolock: | |
d3be915f IM |
402 | mutex_unlock(&dqopt->dqio_mutex); |
403 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
404 | return ret; |
405 | } | |
08d0350c | 406 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
407 | |
408 | /* | |
409 | * Write dquot to disk | |
410 | */ | |
411 | int dquot_commit(struct dquot *dquot) | |
412 | { | |
413 | int ret = 0, ret2 = 0; | |
414 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
415 | ||
d3be915f | 416 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
417 | spin_lock(&dq_list_lock); |
418 | if (!clear_dquot_dirty(dquot)) { | |
419 | spin_unlock(&dq_list_lock); | |
420 | goto out_sem; | |
421 | } | |
422 | spin_unlock(&dq_list_lock); | |
423 | /* Inactive dquot can be only if there was error during read/init | |
424 | * => we have better not writing it */ | |
425 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
426 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
268157ba JK |
427 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
428 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
429 | dquot->dq_sb, dquot->dq_type); | |
430 | } | |
1da177e4 LT |
431 | if (ret >= 0) |
432 | ret = ret2; | |
433 | } | |
434 | out_sem: | |
d3be915f | 435 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
436 | return ret; |
437 | } | |
08d0350c | 438 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
439 | |
440 | /* | |
441 | * Release dquot | |
442 | */ | |
443 | int dquot_release(struct dquot *dquot) | |
444 | { | |
445 | int ret = 0, ret2 = 0; | |
446 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
447 | ||
d3be915f | 448 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
449 | /* Check whether we are not racing with some other dqget() */ |
450 | if (atomic_read(&dquot->dq_count) > 1) | |
451 | goto out_dqlock; | |
d3be915f | 452 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
453 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
454 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
455 | /* Write the info */ | |
268157ba JK |
456 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
457 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
458 | dquot->dq_sb, dquot->dq_type); | |
459 | } | |
1da177e4 LT |
460 | if (ret >= 0) |
461 | ret = ret2; | |
462 | } | |
463 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 464 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 465 | out_dqlock: |
d3be915f | 466 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
467 | return ret; |
468 | } | |
08d0350c | 469 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 470 | |
7d9056ba | 471 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
472 | { |
473 | kmem_cache_free(dquot_cachep, dquot); | |
474 | } | |
7d9056ba | 475 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
476 | |
477 | static inline void do_destroy_dquot(struct dquot *dquot) | |
478 | { | |
479 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
480 | } | |
481 | ||
1da177e4 LT |
482 | /* Invalidate all dquots on the list. Note that this function is called after |
483 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
484 | * quota users. There can still be some users of quotas due to inodes being |
485 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 486 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 487 | */ |
1da177e4 LT |
488 | static void invalidate_dquots(struct super_block *sb, int type) |
489 | { | |
c33ed271 | 490 | struct dquot *dquot, *tmp; |
1da177e4 | 491 | |
6362e4d4 | 492 | restart: |
1da177e4 | 493 | spin_lock(&dq_list_lock); |
c33ed271 | 494 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
495 | if (dquot->dq_sb != sb) |
496 | continue; | |
497 | if (dquot->dq_type != type) | |
498 | continue; | |
6362e4d4 JK |
499 | /* Wait for dquot users */ |
500 | if (atomic_read(&dquot->dq_count)) { | |
501 | DEFINE_WAIT(wait); | |
502 | ||
503 | atomic_inc(&dquot->dq_count); | |
504 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
505 | TASK_UNINTERRUPTIBLE); | |
506 | spin_unlock(&dq_list_lock); | |
507 | /* Once dqput() wakes us up, we know it's time to free | |
508 | * the dquot. | |
509 | * IMPORTANT: we rely on the fact that there is always | |
510 | * at most one process waiting for dquot to free. | |
511 | * Otherwise dq_count would be > 1 and we would never | |
512 | * wake up. | |
513 | */ | |
514 | if (atomic_read(&dquot->dq_count) > 1) | |
515 | schedule(); | |
516 | finish_wait(&dquot->dq_wait_unused, &wait); | |
517 | dqput(dquot); | |
518 | /* At this moment dquot() need not exist (it could be | |
519 | * reclaimed by prune_dqcache(). Hence we must | |
520 | * restart. */ | |
521 | goto restart; | |
522 | } | |
523 | /* | |
524 | * Quota now has no users and it has been written on last | |
525 | * dqput() | |
526 | */ | |
1da177e4 LT |
527 | remove_dquot_hash(dquot); |
528 | remove_free_dquot(dquot); | |
529 | remove_inuse(dquot); | |
74f783af | 530 | do_destroy_dquot(dquot); |
1da177e4 LT |
531 | } |
532 | spin_unlock(&dq_list_lock); | |
533 | } | |
534 | ||
12c77527 JK |
535 | /* Call callback for every active dquot on given filesystem */ |
536 | int dquot_scan_active(struct super_block *sb, | |
537 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
538 | unsigned long priv) | |
539 | { | |
540 | struct dquot *dquot, *old_dquot = NULL; | |
541 | int ret = 0; | |
542 | ||
543 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
544 | spin_lock(&dq_list_lock); | |
545 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
546 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
547 | continue; | |
548 | if (dquot->dq_sb != sb) | |
549 | continue; | |
550 | /* Now we have active dquot so we can just increase use count */ | |
551 | atomic_inc(&dquot->dq_count); | |
552 | dqstats.lookups++; | |
553 | spin_unlock(&dq_list_lock); | |
554 | dqput(old_dquot); | |
555 | old_dquot = dquot; | |
556 | ret = fn(dquot, priv); | |
557 | if (ret < 0) | |
558 | goto out; | |
559 | spin_lock(&dq_list_lock); | |
560 | /* We are safe to continue now because our dquot could not | |
561 | * be moved out of the inuse list while we hold the reference */ | |
562 | } | |
563 | spin_unlock(&dq_list_lock); | |
564 | out: | |
565 | dqput(old_dquot); | |
566 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
567 | return ret; | |
568 | } | |
08d0350c | 569 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 570 | |
1da177e4 LT |
571 | int vfs_quota_sync(struct super_block *sb, int type) |
572 | { | |
573 | struct list_head *dirty; | |
574 | struct dquot *dquot; | |
575 | struct quota_info *dqopt = sb_dqopt(sb); | |
576 | int cnt; | |
577 | ||
d3be915f | 578 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
579 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
580 | if (type != -1 && cnt != type) | |
581 | continue; | |
f55abc0f | 582 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
583 | continue; |
584 | spin_lock(&dq_list_lock); | |
585 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
586 | while (!list_empty(dirty)) { | |
268157ba JK |
587 | dquot = list_first_entry(dirty, struct dquot, |
588 | dq_dirty); | |
1da177e4 LT |
589 | /* Dirty and inactive can be only bad dquot... */ |
590 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
591 | clear_dquot_dirty(dquot); | |
592 | continue; | |
593 | } | |
594 | /* Now we have active dquot from which someone is | |
595 | * holding reference so we can safely just increase | |
596 | * use count */ | |
597 | atomic_inc(&dquot->dq_count); | |
598 | dqstats.lookups++; | |
599 | spin_unlock(&dq_list_lock); | |
600 | sb->dq_op->write_dquot(dquot); | |
601 | dqput(dquot); | |
602 | spin_lock(&dq_list_lock); | |
603 | } | |
604 | spin_unlock(&dq_list_lock); | |
605 | } | |
606 | ||
607 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
608 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
609 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 LT |
610 | sb->dq_op->write_info(sb, cnt); |
611 | spin_lock(&dq_list_lock); | |
612 | dqstats.syncs++; | |
613 | spin_unlock(&dq_list_lock); | |
d3be915f | 614 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
615 | |
616 | return 0; | |
617 | } | |
08d0350c | 618 | EXPORT_SYMBOL(vfs_quota_sync); |
1da177e4 LT |
619 | |
620 | /* Free unused dquots from cache */ | |
621 | static void prune_dqcache(int count) | |
622 | { | |
623 | struct list_head *head; | |
624 | struct dquot *dquot; | |
625 | ||
626 | head = free_dquots.prev; | |
627 | while (head != &free_dquots && count) { | |
628 | dquot = list_entry(head, struct dquot, dq_free); | |
629 | remove_dquot_hash(dquot); | |
630 | remove_free_dquot(dquot); | |
631 | remove_inuse(dquot); | |
74f783af | 632 | do_destroy_dquot(dquot); |
1da177e4 LT |
633 | count--; |
634 | head = free_dquots.prev; | |
635 | } | |
636 | } | |
637 | ||
638 | /* | |
639 | * This is called from kswapd when we think we need some | |
640 | * more memory | |
641 | */ | |
642 | ||
27496a8c | 643 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
644 | { |
645 | if (nr) { | |
646 | spin_lock(&dq_list_lock); | |
647 | prune_dqcache(nr); | |
648 | spin_unlock(&dq_list_lock); | |
649 | } | |
650 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
651 | } | |
652 | ||
8e1f936b RR |
653 | static struct shrinker dqcache_shrinker = { |
654 | .shrink = shrink_dqcache_memory, | |
655 | .seeks = DEFAULT_SEEKS, | |
656 | }; | |
657 | ||
1da177e4 LT |
658 | /* |
659 | * Put reference to dquot | |
660 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 661 | */ |
3d9ea253 | 662 | void dqput(struct dquot *dquot) |
1da177e4 | 663 | { |
b48d3805 JK |
664 | int ret; |
665 | ||
1da177e4 LT |
666 | if (!dquot) |
667 | return; | |
668 | #ifdef __DQUOT_PARANOIA | |
669 | if (!atomic_read(&dquot->dq_count)) { | |
670 | printk("VFS: dqput: trying to free free dquot\n"); | |
671 | printk("VFS: device %s, dquot of %s %d\n", | |
672 | dquot->dq_sb->s_id, | |
673 | quotatypes[dquot->dq_type], | |
674 | dquot->dq_id); | |
675 | BUG(); | |
676 | } | |
677 | #endif | |
678 | ||
679 | spin_lock(&dq_list_lock); | |
680 | dqstats.drops++; | |
681 | spin_unlock(&dq_list_lock); | |
682 | we_slept: | |
683 | spin_lock(&dq_list_lock); | |
684 | if (atomic_read(&dquot->dq_count) > 1) { | |
685 | /* We have more than one user... nothing to do */ | |
686 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 687 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 688 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
689 | atomic_read(&dquot->dq_count) == 1) |
690 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
691 | spin_unlock(&dq_list_lock); |
692 | return; | |
693 | } | |
694 | /* Need to release dquot? */ | |
695 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
696 | spin_unlock(&dq_list_lock); | |
697 | /* Commit dquot before releasing */ | |
b48d3805 JK |
698 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
699 | if (ret < 0) { | |
700 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
701 | "device %s (error %d). Quota may get out of " | |
702 | "sync!\n", dquot->dq_sb->s_id, ret); | |
703 | /* | |
704 | * We clear dirty bit anyway, so that we avoid | |
705 | * infinite loop here | |
706 | */ | |
707 | spin_lock(&dq_list_lock); | |
708 | clear_dquot_dirty(dquot); | |
709 | spin_unlock(&dq_list_lock); | |
710 | } | |
1da177e4 LT |
711 | goto we_slept; |
712 | } | |
713 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
714 | clear_dquot_dirty(dquot); | |
715 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
716 | spin_unlock(&dq_list_lock); | |
717 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
718 | goto we_slept; | |
719 | } | |
720 | atomic_dec(&dquot->dq_count); | |
721 | #ifdef __DQUOT_PARANOIA | |
722 | /* sanity check */ | |
8abf6a47 | 723 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
724 | #endif |
725 | put_dquot_last(dquot); | |
726 | spin_unlock(&dq_list_lock); | |
727 | } | |
08d0350c | 728 | EXPORT_SYMBOL(dqput); |
1da177e4 | 729 | |
7d9056ba | 730 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
731 | { |
732 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
733 | } | |
7d9056ba | 734 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 735 | |
1da177e4 LT |
736 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
737 | { | |
738 | struct dquot *dquot; | |
739 | ||
74f783af | 740 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 741 | if(!dquot) |
dd6f3c6d | 742 | return NULL; |
1da177e4 | 743 | |
d3be915f | 744 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
745 | INIT_LIST_HEAD(&dquot->dq_free); |
746 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
747 | INIT_HLIST_NODE(&dquot->dq_hash); | |
748 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 749 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
750 | dquot->dq_sb = sb; |
751 | dquot->dq_type = type; | |
752 | atomic_set(&dquot->dq_count, 1); | |
753 | ||
754 | return dquot; | |
755 | } | |
756 | ||
757 | /* | |
758 | * Get reference to dquot | |
cc33412f JK |
759 | * |
760 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
761 | * destroying our dquot by: | |
762 | * a) checking for quota flags under dq_list_lock and | |
763 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 764 | */ |
3d9ea253 | 765 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
766 | { |
767 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 768 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 769 | |
f55abc0f | 770 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 771 | return NULL; |
1da177e4 LT |
772 | we_slept: |
773 | spin_lock(&dq_list_lock); | |
cc33412f JK |
774 | spin_lock(&dq_state_lock); |
775 | if (!sb_has_quota_active(sb, type)) { | |
776 | spin_unlock(&dq_state_lock); | |
777 | spin_unlock(&dq_list_lock); | |
778 | goto out; | |
779 | } | |
780 | spin_unlock(&dq_state_lock); | |
781 | ||
dd6f3c6d JK |
782 | dquot = find_dquot(hashent, sb, id, type); |
783 | if (!dquot) { | |
784 | if (!empty) { | |
1da177e4 | 785 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
786 | empty = get_empty_dquot(sb, type); |
787 | if (!empty) | |
1da177e4 LT |
788 | schedule(); /* Try to wait for a moment... */ |
789 | goto we_slept; | |
790 | } | |
791 | dquot = empty; | |
dd6f3c6d | 792 | empty = NULL; |
1da177e4 LT |
793 | dquot->dq_id = id; |
794 | /* all dquots go on the inuse_list */ | |
795 | put_inuse(dquot); | |
796 | /* hash it first so it can be found */ | |
797 | insert_dquot_hash(dquot); | |
798 | dqstats.lookups++; | |
799 | spin_unlock(&dq_list_lock); | |
800 | } else { | |
801 | if (!atomic_read(&dquot->dq_count)) | |
802 | remove_free_dquot(dquot); | |
803 | atomic_inc(&dquot->dq_count); | |
804 | dqstats.cache_hits++; | |
805 | dqstats.lookups++; | |
806 | spin_unlock(&dq_list_lock); | |
1da177e4 | 807 | } |
268157ba JK |
808 | /* Wait for dq_lock - after this we know that either dquot_release() is |
809 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 810 | wait_on_dquot(dquot); |
268157ba JK |
811 | /* Read the dquot / allocate space in quota file */ |
812 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
813 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 814 | dqput(dquot); |
dd6f3c6d | 815 | dquot = NULL; |
cc33412f | 816 | goto out; |
1da177e4 LT |
817 | } |
818 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 819 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 820 | #endif |
cc33412f JK |
821 | out: |
822 | if (empty) | |
823 | do_destroy_dquot(empty); | |
1da177e4 LT |
824 | |
825 | return dquot; | |
826 | } | |
08d0350c | 827 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
828 | |
829 | static int dqinit_needed(struct inode *inode, int type) | |
830 | { | |
831 | int cnt; | |
832 | ||
833 | if (IS_NOQUOTA(inode)) | |
834 | return 0; | |
835 | if (type != -1) | |
dd6f3c6d | 836 | return !inode->i_dquot[type]; |
1da177e4 | 837 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 838 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
839 | return 1; |
840 | return 0; | |
841 | } | |
842 | ||
d3be915f | 843 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
844 | static void add_dquot_ref(struct super_block *sb, int type) |
845 | { | |
941d2380 | 846 | struct inode *inode, *old_inode = NULL; |
1da177e4 | 847 | |
d003fb70 CH |
848 | spin_lock(&inode_lock); |
849 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
b6fac63c | 850 | if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) |
aabb8fdb | 851 | continue; |
d003fb70 CH |
852 | if (!atomic_read(&inode->i_writecount)) |
853 | continue; | |
854 | if (!dqinit_needed(inode, type)) | |
855 | continue; | |
d003fb70 CH |
856 | |
857 | __iget(inode); | |
858 | spin_unlock(&inode_lock); | |
859 | ||
941d2380 | 860 | iput(old_inode); |
d003fb70 | 861 | sb->dq_op->initialize(inode, type); |
941d2380 JK |
862 | /* We hold a reference to 'inode' so it couldn't have been |
863 | * removed from s_inodes list while we dropped the inode_lock. | |
864 | * We cannot iput the inode now as we can be holding the last | |
865 | * reference and we cannot iput it under inode_lock. So we | |
866 | * keep the reference and iput it later. */ | |
867 | old_inode = inode; | |
868 | spin_lock(&inode_lock); | |
1da177e4 | 869 | } |
d003fb70 | 870 | spin_unlock(&inode_lock); |
941d2380 | 871 | iput(old_inode); |
1da177e4 LT |
872 | } |
873 | ||
268157ba JK |
874 | /* |
875 | * Return 0 if dqput() won't block. | |
876 | * (note that 1 doesn't necessarily mean blocking) | |
877 | */ | |
1da177e4 LT |
878 | static inline int dqput_blocks(struct dquot *dquot) |
879 | { | |
880 | if (atomic_read(&dquot->dq_count) <= 1) | |
881 | return 1; | |
882 | return 0; | |
883 | } | |
884 | ||
268157ba JK |
885 | /* |
886 | * Remove references to dquots from inode and add dquot to list for freeing | |
887 | * if we have the last referece to dquot | |
888 | * We can't race with anybody because we hold dqptr_sem for writing... | |
889 | */ | |
e5f00f42 AB |
890 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
891 | struct list_head *tofree_head) | |
1da177e4 LT |
892 | { |
893 | struct dquot *dquot = inode->i_dquot[type]; | |
894 | ||
dd6f3c6d JK |
895 | inode->i_dquot[type] = NULL; |
896 | if (dquot) { | |
1da177e4 LT |
897 | if (dqput_blocks(dquot)) { |
898 | #ifdef __DQUOT_PARANOIA | |
899 | if (atomic_read(&dquot->dq_count) != 1) | |
900 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
901 | #endif | |
902 | spin_lock(&dq_list_lock); | |
268157ba JK |
903 | /* As dquot must have currently users it can't be on |
904 | * the free list... */ | |
905 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
906 | spin_unlock(&dq_list_lock); |
907 | return 1; | |
908 | } | |
909 | else | |
910 | dqput(dquot); /* We have guaranteed we won't block */ | |
911 | } | |
912 | return 0; | |
913 | } | |
914 | ||
268157ba JK |
915 | /* |
916 | * Free list of dquots | |
917 | * Dquots are removed from inodes and no new references can be got so we are | |
918 | * the only ones holding reference | |
919 | */ | |
1da177e4 LT |
920 | static void put_dquot_list(struct list_head *tofree_head) |
921 | { | |
922 | struct list_head *act_head; | |
923 | struct dquot *dquot; | |
924 | ||
925 | act_head = tofree_head->next; | |
1da177e4 LT |
926 | while (act_head != tofree_head) { |
927 | dquot = list_entry(act_head, struct dquot, dq_free); | |
928 | act_head = act_head->next; | |
268157ba JK |
929 | /* Remove dquot from the list so we won't have problems... */ |
930 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
931 | dqput(dquot); |
932 | } | |
933 | } | |
934 | ||
fb58b731 CH |
935 | static void remove_dquot_ref(struct super_block *sb, int type, |
936 | struct list_head *tofree_head) | |
937 | { | |
938 | struct inode *inode; | |
939 | ||
940 | spin_lock(&inode_lock); | |
941 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
aabb8fdb NP |
942 | /* |
943 | * We have to scan also I_NEW inodes because they can already | |
944 | * have quota pointer initialized. Luckily, we need to touch | |
945 | * only quota pointers and these have separate locking | |
946 | * (dqptr_sem). | |
947 | */ | |
fb58b731 CH |
948 | if (!IS_NOQUOTA(inode)) |
949 | remove_inode_dquot_ref(inode, type, tofree_head); | |
950 | } | |
951 | spin_unlock(&inode_lock); | |
952 | } | |
953 | ||
1da177e4 LT |
954 | /* Gather all references from inodes and drop them */ |
955 | static void drop_dquot_ref(struct super_block *sb, int type) | |
956 | { | |
957 | LIST_HEAD(tofree_head); | |
958 | ||
fb58b731 CH |
959 | if (sb->dq_op) { |
960 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
961 | remove_dquot_ref(sb, type, &tofree_head); | |
962 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
963 | put_dquot_list(&tofree_head); | |
964 | } | |
1da177e4 LT |
965 | } |
966 | ||
12095460 | 967 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
968 | { |
969 | dquot->dq_dqb.dqb_curinodes += number; | |
970 | } | |
971 | ||
972 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
973 | { | |
974 | dquot->dq_dqb.dqb_curspace += number; | |
975 | } | |
976 | ||
f18df228 MC |
977 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
978 | { | |
979 | dquot->dq_dqb.dqb_rsvspace += number; | |
980 | } | |
981 | ||
740d9dcd MC |
982 | /* |
983 | * Claim reserved quota space | |
984 | */ | |
985 | static void dquot_claim_reserved_space(struct dquot *dquot, | |
986 | qsize_t number) | |
987 | { | |
988 | WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); | |
989 | dquot->dq_dqb.dqb_curspace += number; | |
990 | dquot->dq_dqb.dqb_rsvspace -= number; | |
991 | } | |
992 | ||
993 | static inline | |
994 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
995 | { | |
996 | dquot->dq_dqb.dqb_rsvspace -= number; | |
997 | } | |
998 | ||
7a2435d8 | 999 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1000 | { |
db49d2df JK |
1001 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1002 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1003 | dquot->dq_dqb.dqb_curinodes -= number; |
1004 | else | |
1005 | dquot->dq_dqb.dqb_curinodes = 0; | |
1006 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1007 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1008 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1009 | } | |
1010 | ||
7a2435d8 | 1011 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1012 | { |
db49d2df JK |
1013 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1014 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1015 | dquot->dq_dqb.dqb_curspace -= number; |
1016 | else | |
1017 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1018 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1019 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1020 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1021 | } | |
1022 | ||
c525460e JK |
1023 | static int warning_issued(struct dquot *dquot, const int warntype) |
1024 | { | |
1025 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1026 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1027 | ((warntype == QUOTA_NL_IHARDWARN || | |
1028 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1029 | ||
1030 | if (!flag) | |
1031 | return 0; | |
1032 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1033 | } | |
1034 | ||
8e893469 | 1035 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1036 | static int flag_print_warnings = 1; |
1037 | ||
7a2435d8 | 1038 | static int need_print_warning(struct dquot *dquot) |
1da177e4 LT |
1039 | { |
1040 | if (!flag_print_warnings) | |
1041 | return 0; | |
1042 | ||
1043 | switch (dquot->dq_type) { | |
1044 | case USRQUOTA: | |
da9592ed | 1045 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
1046 | case GRPQUOTA: |
1047 | return in_group_p(dquot->dq_id); | |
1048 | } | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1da177e4 | 1052 | /* Print warning to user which exceeded quota */ |
c525460e | 1053 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
1054 | { |
1055 | char *msg = NULL; | |
24ec839c | 1056 | struct tty_struct *tty; |
1da177e4 | 1057 | |
657d3bfa JK |
1058 | if (warntype == QUOTA_NL_IHARDBELOW || |
1059 | warntype == QUOTA_NL_ISOFTBELOW || | |
1060 | warntype == QUOTA_NL_BHARDBELOW || | |
1061 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1062 | return; |
1063 | ||
24ec839c PZ |
1064 | tty = get_current_tty(); |
1065 | if (!tty) | |
452a00d2 | 1066 | return; |
24ec839c | 1067 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1068 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1069 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1070 | else |
24ec839c PZ |
1071 | tty_write_message(tty, ": write failed, "); |
1072 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1073 | switch (warntype) { |
8e893469 | 1074 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1075 | msg = " file limit reached.\r\n"; |
1076 | break; | |
8e893469 | 1077 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1078 | msg = " file quota exceeded too long.\r\n"; |
1079 | break; | |
8e893469 | 1080 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1081 | msg = " file quota exceeded.\r\n"; |
1082 | break; | |
8e893469 | 1083 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1084 | msg = " block limit reached.\r\n"; |
1085 | break; | |
8e893469 | 1086 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1087 | msg = " block quota exceeded too long.\r\n"; |
1088 | break; | |
8e893469 | 1089 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1090 | msg = " block quota exceeded.\r\n"; |
1091 | break; | |
1092 | } | |
24ec839c | 1093 | tty_write_message(tty, msg); |
452a00d2 | 1094 | tty_kref_put(tty); |
1da177e4 | 1095 | } |
8e893469 JK |
1096 | #endif |
1097 | ||
f18df228 MC |
1098 | /* |
1099 | * Write warnings to the console and send warning messages over netlink. | |
1100 | * | |
1101 | * Note that this function can sleep. | |
1102 | */ | |
7a2435d8 | 1103 | static void flush_warnings(struct dquot *const *dquots, char *warntype) |
1da177e4 | 1104 | { |
86e931a3 | 1105 | struct dquot *dq; |
1da177e4 LT |
1106 | int i; |
1107 | ||
86e931a3 SW |
1108 | for (i = 0; i < MAXQUOTAS; i++) { |
1109 | dq = dquots[i]; | |
1110 | if (dq && warntype[i] != QUOTA_NL_NOWARN && | |
1111 | !warning_issued(dq, warntype[i])) { | |
8e893469 | 1112 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
86e931a3 | 1113 | print_warning(dq, warntype[i]); |
8e893469 | 1114 | #endif |
86e931a3 SW |
1115 | quota_send_warning(dq->dq_type, dq->dq_id, |
1116 | dq->dq_sb->s_dev, warntype[i]); | |
8e893469 | 1117 | } |
86e931a3 | 1118 | } |
1da177e4 LT |
1119 | } |
1120 | ||
7a2435d8 | 1121 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 LT |
1122 | { |
1123 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1124 | ||
1125 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1126 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1127 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | /* needs dq_data_lock */ | |
12095460 | 1131 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1132 | { |
268157ba JK |
1133 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1134 | ||
8e893469 | 1135 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1136 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1137 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1138 | return QUOTA_OK; |
1139 | ||
1140 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1141 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1142 | !ignore_hardlimit(dquot)) { |
8e893469 | 1143 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1144 | return NO_QUOTA; |
1145 | } | |
1146 | ||
1147 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1148 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1149 | dquot->dq_dqb.dqb_itime && | |
1150 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1151 | !ignore_hardlimit(dquot)) { |
8e893469 | 1152 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1153 | return NO_QUOTA; |
1154 | } | |
1155 | ||
1156 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1157 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1158 | dquot->dq_dqb.dqb_itime == 0) { |
8e893469 | 1159 | *warntype = QUOTA_NL_ISOFTWARN; |
268157ba JK |
1160 | dquot->dq_dqb.dqb_itime = get_seconds() + |
1161 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; | |
1da177e4 LT |
1162 | } |
1163 | ||
1164 | return QUOTA_OK; | |
1165 | } | |
1166 | ||
1167 | /* needs dq_data_lock */ | |
1168 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1169 | { | |
f18df228 | 1170 | qsize_t tspace; |
268157ba | 1171 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1172 | |
8e893469 | 1173 | *warntype = QUOTA_NL_NOWARN; |
268157ba | 1174 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || |
f55abc0f | 1175 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
1da177e4 LT |
1176 | return QUOTA_OK; |
1177 | ||
f18df228 MC |
1178 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1179 | + space; | |
1180 | ||
1da177e4 | 1181 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1182 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1183 | !ignore_hardlimit(dquot)) { |
1184 | if (!prealloc) | |
8e893469 | 1185 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1186 | return NO_QUOTA; |
1187 | } | |
1188 | ||
1189 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1190 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1191 | dquot->dq_dqb.dqb_btime && |
1192 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1193 | !ignore_hardlimit(dquot)) { |
1194 | if (!prealloc) | |
8e893469 | 1195 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1196 | return NO_QUOTA; |
1197 | } | |
1198 | ||
1199 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1200 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1201 | dquot->dq_dqb.dqb_btime == 0) { |
1202 | if (!prealloc) { | |
8e893469 | 1203 | *warntype = QUOTA_NL_BSOFTWARN; |
268157ba JK |
1204 | dquot->dq_dqb.dqb_btime = get_seconds() + |
1205 | sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; | |
1da177e4 LT |
1206 | } |
1207 | else | |
1208 | /* | |
1209 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1210 | * be always printed | |
1211 | */ | |
1212 | return NO_QUOTA; | |
1213 | } | |
1214 | ||
1215 | return QUOTA_OK; | |
1216 | } | |
1217 | ||
12095460 | 1218 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1219 | { |
268157ba JK |
1220 | qsize_t newinodes; |
1221 | ||
657d3bfa | 1222 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f JK |
1223 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1224 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1225 | return QUOTA_NL_NOWARN; |
1226 | ||
268157ba JK |
1227 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1228 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1229 | return QUOTA_NL_ISOFTBELOW; |
1230 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1231 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1232 | return QUOTA_NL_IHARDBELOW; |
1233 | return QUOTA_NL_NOWARN; | |
1234 | } | |
1235 | ||
1236 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1237 | { | |
1238 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1239 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1240 | return QUOTA_NL_NOWARN; |
1241 | ||
12095460 | 1242 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1243 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1244 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1245 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1246 | return QUOTA_NL_BHARDBELOW; |
1247 | return QUOTA_NL_NOWARN; | |
1248 | } | |
1da177e4 LT |
1249 | /* |
1250 | * Initialize quota pointers in inode | |
cc33412f JK |
1251 | * We do things in a bit complicated way but by that we avoid calling |
1252 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1da177e4 LT |
1253 | */ |
1254 | int dquot_initialize(struct inode *inode, int type) | |
1255 | { | |
1256 | unsigned int id = 0; | |
1257 | int cnt, ret = 0; | |
dd6f3c6d | 1258 | struct dquot *got[MAXQUOTAS] = { NULL, NULL }; |
cc33412f | 1259 | struct super_block *sb = inode->i_sb; |
1da177e4 | 1260 | |
d3be915f IM |
1261 | /* First test before acquiring mutex - solves deadlocks when we |
1262 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1263 | if (IS_NOQUOTA(inode)) |
1264 | return 0; | |
cc33412f JK |
1265 | |
1266 | /* First get references to structures we might need. */ | |
1267 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1268 | if (type != -1 && cnt != type) | |
1269 | continue; | |
1270 | switch (cnt) { | |
1271 | case USRQUOTA: | |
1272 | id = inode->i_uid; | |
1273 | break; | |
1274 | case GRPQUOTA: | |
1275 | id = inode->i_gid; | |
1276 | break; | |
1277 | } | |
1278 | got[cnt] = dqget(sb, id, cnt); | |
1279 | } | |
1280 | ||
1281 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1282 | if (IS_NOQUOTA(inode)) |
1283 | goto out_err; | |
1284 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1285 | if (type != -1 && cnt != type) | |
1286 | continue; | |
cc33412f JK |
1287 | /* Avoid races with quotaoff() */ |
1288 | if (!sb_has_quota_active(sb, cnt)) | |
1289 | continue; | |
dd6f3c6d | 1290 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1291 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1292 | got[cnt] = NULL; |
1da177e4 LT |
1293 | } |
1294 | } | |
1295 | out_err: | |
cc33412f JK |
1296 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1297 | /* Drop unused references */ | |
dc52dd3a | 1298 | dqput_all(got); |
1da177e4 LT |
1299 | return ret; |
1300 | } | |
08d0350c | 1301 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1302 | |
1303 | /* | |
1304 | * Release all quotas referenced by inode | |
1da177e4 | 1305 | */ |
cc33412f | 1306 | int dquot_drop(struct inode *inode) |
1da177e4 LT |
1307 | { |
1308 | int cnt; | |
cc33412f | 1309 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1310 | |
cc33412f | 1311 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1312 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1313 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1314 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1315 | } |
1316 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1317 | dqput_all(put); |
1da177e4 LT |
1318 | return 0; |
1319 | } | |
08d0350c | 1320 | EXPORT_SYMBOL(dquot_drop); |
1da177e4 | 1321 | |
b85f4b87 JK |
1322 | /* Wrapper to remove references to quota structures from inode */ |
1323 | void vfs_dq_drop(struct inode *inode) | |
1324 | { | |
1325 | /* Here we can get arbitrary inode from clear_inode() so we have | |
1326 | * to be careful. OTOH we don't need locking as quota operations | |
1327 | * are allowed to change only at mount time */ | |
1328 | if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op | |
1329 | && inode->i_sb->dq_op->drop) { | |
1330 | int cnt; | |
1331 | /* Test before calling to rule out calls from proc and such | |
1332 | * where we are not allowed to block. Note that this is | |
1333 | * actually reliable test even without the lock - the caller | |
1334 | * must assure that nobody can come after the DQUOT_DROP and | |
1335 | * add quota pointers back anyway */ | |
1336 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1337 | if (inode->i_dquot[cnt]) |
b85f4b87 JK |
1338 | break; |
1339 | if (cnt < MAXQUOTAS) | |
1340 | inode->i_sb->dq_op->drop(inode); | |
1341 | } | |
1342 | } | |
08d0350c | 1343 | EXPORT_SYMBOL(vfs_dq_drop); |
b85f4b87 | 1344 | |
fd8fbfc1 DM |
1345 | /* |
1346 | * inode_reserved_space is managed internally by quota, and protected by | |
1347 | * i_lock similar to i_blocks+i_bytes. | |
1348 | */ | |
1349 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1350 | { | |
1351 | /* Filesystem must explicitly define it's own method in order to use | |
1352 | * quota reservation interface */ | |
1353 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1354 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1355 | } | |
1356 | ||
1357 | static void inode_add_rsv_space(struct inode *inode, qsize_t number) | |
1358 | { | |
1359 | spin_lock(&inode->i_lock); | |
1360 | *inode_reserved_space(inode) += number; | |
1361 | spin_unlock(&inode->i_lock); | |
1362 | } | |
1363 | ||
1364 | ||
1365 | static void inode_claim_rsv_space(struct inode *inode, qsize_t number) | |
1366 | { | |
1367 | spin_lock(&inode->i_lock); | |
1368 | *inode_reserved_space(inode) -= number; | |
1369 | __inode_add_bytes(inode, number); | |
1370 | spin_unlock(&inode->i_lock); | |
1371 | } | |
1372 | ||
1373 | static void inode_sub_rsv_space(struct inode *inode, qsize_t number) | |
1374 | { | |
1375 | spin_lock(&inode->i_lock); | |
1376 | *inode_reserved_space(inode) -= number; | |
1377 | spin_unlock(&inode->i_lock); | |
1378 | } | |
1379 | ||
1380 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1381 | { | |
1382 | qsize_t ret; | |
05b5d898 JK |
1383 | |
1384 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1385 | return 0; | |
fd8fbfc1 DM |
1386 | spin_lock(&inode->i_lock); |
1387 | ret = *inode_reserved_space(inode); | |
1388 | spin_unlock(&inode->i_lock); | |
1389 | return ret; | |
1390 | } | |
1391 | ||
1392 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1393 | int reserve) | |
1394 | { | |
1395 | if (reserve) | |
1396 | inode_add_rsv_space(inode, number); | |
1397 | else | |
1398 | inode_add_bytes(inode, number); | |
1399 | } | |
1400 | ||
1401 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1402 | { | |
1403 | if (reserve) | |
1404 | inode_sub_rsv_space(inode, number); | |
1405 | else | |
1406 | inode_sub_bytes(inode, number); | |
1407 | } | |
1408 | ||
1da177e4 LT |
1409 | /* |
1410 | * Following four functions update i_blocks+i_bytes fields and | |
1411 | * quota information (together with appropriate checks) | |
1412 | * NOTE: We absolutely rely on the fact that caller dirties | |
1413 | * the inode (usually macros in quotaops.h care about this) and | |
1414 | * holds a handle for the current transaction so that dquot write and | |
1415 | * inode write go into the same transaction. | |
1416 | */ | |
1417 | ||
1418 | /* | |
1419 | * This operation can block, but only after everything is updated | |
1420 | */ | |
f18df228 MC |
1421 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
1422 | int warn, int reserve) | |
1da177e4 | 1423 | { |
f18df228 | 1424 | int cnt, ret = QUOTA_OK; |
1da177e4 LT |
1425 | char warntype[MAXQUOTAS]; |
1426 | ||
fd8fbfc1 DM |
1427 | /* |
1428 | * First test before acquiring mutex - solves deadlocks when we | |
1429 | * re-enter the quota code and are already holding the mutex | |
1430 | */ | |
1431 | if (IS_NOQUOTA(inode)) { | |
1432 | inode_incr_space(inode, number, reserve); | |
1433 | goto out; | |
1434 | } | |
1435 | ||
1436 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1da177e4 | 1437 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1438 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1439 | |
1da177e4 LT |
1440 | spin_lock(&dq_data_lock); |
1441 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1442 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1443 | continue; |
f18df228 MC |
1444 | if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) |
1445 | == NO_QUOTA) { | |
1446 | ret = NO_QUOTA; | |
fd8fbfc1 DM |
1447 | spin_unlock(&dq_data_lock); |
1448 | goto out_flush_warn; | |
f18df228 | 1449 | } |
1da177e4 LT |
1450 | } |
1451 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1452 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1453 | continue; |
f18df228 MC |
1454 | if (reserve) |
1455 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1456 | else | |
1457 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1458 | } |
fd8fbfc1 | 1459 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1460 | spin_unlock(&dq_data_lock); |
f18df228 | 1461 | |
fd8fbfc1 DM |
1462 | if (reserve) |
1463 | goto out_flush_warn; | |
dc52dd3a | 1464 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 DM |
1465 | out_flush_warn: |
1466 | flush_warnings(inode->i_dquot, warntype); | |
1da177e4 | 1467 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1468 | out: |
1469 | return ret; | |
1470 | } | |
fd8fbfc1 DM |
1471 | |
1472 | int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) | |
1473 | { | |
1474 | return __dquot_alloc_space(inode, number, warn, 0); | |
1475 | } | |
08d0350c | 1476 | EXPORT_SYMBOL(dquot_alloc_space); |
f18df228 MC |
1477 | |
1478 | int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) | |
1479 | { | |
fd8fbfc1 | 1480 | return __dquot_alloc_space(inode, number, warn, 1); |
1da177e4 | 1481 | } |
f18df228 | 1482 | EXPORT_SYMBOL(dquot_reserve_space); |
1da177e4 LT |
1483 | |
1484 | /* | |
1485 | * This operation can block, but only after everything is updated | |
1486 | */ | |
12095460 | 1487 | int dquot_alloc_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1488 | { |
1489 | int cnt, ret = NO_QUOTA; | |
1490 | char warntype[MAXQUOTAS]; | |
1491 | ||
d3be915f IM |
1492 | /* First test before acquiring mutex - solves deadlocks when we |
1493 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1494 | if (IS_NOQUOTA(inode)) |
1495 | return QUOTA_OK; | |
1496 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1497 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1498 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1499 | spin_lock(&dq_data_lock); |
1500 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1501 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1502 | continue; |
268157ba JK |
1503 | if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) |
1504 | == NO_QUOTA) | |
1da177e4 LT |
1505 | goto warn_put_all; |
1506 | } | |
1507 | ||
1508 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1509 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
1510 | continue; |
1511 | dquot_incr_inodes(inode->i_dquot[cnt], number); | |
1512 | } | |
1513 | ret = QUOTA_OK; | |
1514 | warn_put_all: | |
1515 | spin_unlock(&dq_data_lock); | |
1516 | if (ret == QUOTA_OK) | |
dc52dd3a | 1517 | mark_all_dquot_dirty(inode->i_dquot); |
087ee8d5 | 1518 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1519 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1520 | return ret; | |
1521 | } | |
08d0350c | 1522 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1523 | |
740d9dcd MC |
1524 | int dquot_claim_space(struct inode *inode, qsize_t number) |
1525 | { | |
1526 | int cnt; | |
1527 | int ret = QUOTA_OK; | |
1528 | ||
1529 | if (IS_NOQUOTA(inode)) { | |
fd8fbfc1 | 1530 | inode_claim_rsv_space(inode, number); |
740d9dcd MC |
1531 | goto out; |
1532 | } | |
1533 | ||
1534 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
740d9dcd MC |
1535 | spin_lock(&dq_data_lock); |
1536 | /* Claim reserved quotas to allocated quotas */ | |
1537 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1538 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1539 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1540 | number); | |
1541 | } | |
1542 | /* Update inode bytes */ | |
fd8fbfc1 | 1543 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1544 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1545 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd MC |
1546 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1547 | out: | |
1548 | return ret; | |
1549 | } | |
1550 | EXPORT_SYMBOL(dquot_claim_space); | |
1551 | ||
1da177e4 LT |
1552 | /* |
1553 | * This operation can block, but only after everything is updated | |
1554 | */ | |
fd8fbfc1 | 1555 | int __dquot_free_space(struct inode *inode, qsize_t number, int reserve) |
1da177e4 LT |
1556 | { |
1557 | unsigned int cnt; | |
657d3bfa | 1558 | char warntype[MAXQUOTAS]; |
1da177e4 | 1559 | |
d3be915f IM |
1560 | /* First test before acquiring mutex - solves deadlocks when we |
1561 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 | 1562 | if (IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1563 | inode_decr_space(inode, number, reserve); |
1da177e4 LT |
1564 | return QUOTA_OK; |
1565 | } | |
657d3bfa | 1566 | |
1da177e4 | 1567 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1568 | spin_lock(&dq_data_lock); |
1569 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1570 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1571 | continue; |
657d3bfa | 1572 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
fd8fbfc1 DM |
1573 | if (reserve) |
1574 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1575 | else | |
1576 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1577 | } |
fd8fbfc1 | 1578 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1579 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1580 | |
1581 | if (reserve) | |
1582 | goto out_unlock; | |
dc52dd3a | 1583 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 | 1584 | out_unlock: |
657d3bfa | 1585 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1586 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1587 | return QUOTA_OK; | |
1588 | } | |
fd8fbfc1 DM |
1589 | |
1590 | int dquot_free_space(struct inode *inode, qsize_t number) | |
1591 | { | |
1592 | return __dquot_free_space(inode, number, 0); | |
1593 | } | |
08d0350c | 1594 | EXPORT_SYMBOL(dquot_free_space); |
1da177e4 | 1595 | |
fd8fbfc1 DM |
1596 | /* |
1597 | * Release reserved quota space | |
1598 | */ | |
1599 | void dquot_release_reserved_space(struct inode *inode, qsize_t number) | |
1600 | { | |
1601 | __dquot_free_space(inode, number, 1); | |
1602 | ||
1603 | } | |
1604 | EXPORT_SYMBOL(dquot_release_reserved_space); | |
1605 | ||
1da177e4 LT |
1606 | /* |
1607 | * This operation can block, but only after everything is updated | |
1608 | */ | |
12095460 | 1609 | int dquot_free_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1610 | { |
1611 | unsigned int cnt; | |
657d3bfa | 1612 | char warntype[MAXQUOTAS]; |
1da177e4 | 1613 | |
d3be915f IM |
1614 | /* First test before acquiring mutex - solves deadlocks when we |
1615 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1616 | if (IS_NOQUOTA(inode)) |
1617 | return QUOTA_OK; | |
657d3bfa | 1618 | |
1da177e4 | 1619 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1620 | spin_lock(&dq_data_lock); |
1621 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1622 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1623 | continue; |
657d3bfa | 1624 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1625 | dquot_decr_inodes(inode->i_dquot[cnt], number); |
1626 | } | |
1627 | spin_unlock(&dq_data_lock); | |
dc52dd3a | 1628 | mark_all_dquot_dirty(inode->i_dquot); |
657d3bfa | 1629 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1630 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1631 | return QUOTA_OK; | |
1632 | } | |
08d0350c | 1633 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1634 | |
1635 | /* | |
1636 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1637 | * | |
1638 | * This operation can block, but only after everything is updated | |
1639 | * A transaction must be started when entering this function. | |
1640 | */ | |
1641 | int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
1642 | { | |
740d9dcd MC |
1643 | qsize_t space, cur_space; |
1644 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1645 | struct dquot *transfer_from[MAXQUOTAS]; |
1646 | struct dquot *transfer_to[MAXQUOTAS]; | |
cc33412f JK |
1647 | int cnt, ret = QUOTA_OK; |
1648 | int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, | |
1649 | chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; | |
657d3bfa JK |
1650 | char warntype_to[MAXQUOTAS]; |
1651 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1652 | |
d3be915f IM |
1653 | /* First test before acquiring mutex - solves deadlocks when we |
1654 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1655 | if (IS_NOQUOTA(inode)) |
1656 | return QUOTA_OK; | |
cc33412f | 1657 | /* Initialize the arrays */ |
1da177e4 | 1658 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
dd6f3c6d JK |
1659 | transfer_from[cnt] = NULL; |
1660 | transfer_to[cnt] = NULL; | |
657d3bfa | 1661 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1662 | } |
268157ba JK |
1663 | if (chuid) |
1664 | transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid, | |
1665 | USRQUOTA); | |
1666 | if (chgid) | |
1667 | transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid, | |
1668 | GRPQUOTA); | |
cc33412f JK |
1669 | |
1670 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
cc33412f JK |
1671 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
1672 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1673 | goto put_all; | |
1674 | } | |
1da177e4 | 1675 | spin_lock(&dq_data_lock); |
740d9dcd | 1676 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1677 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1678 | space = cur_space + rsv_space; |
1da177e4 LT |
1679 | /* Build the transfer_from list and check the limits */ |
1680 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1681 | if (!transfer_to[cnt]) |
1da177e4 LT |
1682 | continue; |
1683 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
657d3bfa JK |
1684 | if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == |
1685 | NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, | |
1686 | warntype_to + cnt) == NO_QUOTA) | |
cc33412f | 1687 | goto over_quota; |
1da177e4 LT |
1688 | } |
1689 | ||
1690 | /* | |
1691 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1692 | */ | |
1693 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1694 | /* | |
1695 | * Skip changes for same uid or gid or for turned off quota-type. | |
1696 | */ | |
dd6f3c6d | 1697 | if (!transfer_to[cnt]) |
1da177e4 LT |
1698 | continue; |
1699 | ||
1700 | /* Due to IO error we might not have transfer_from[] structure */ | |
1701 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1702 | warntype_from_inodes[cnt] = |
1703 | info_idq_free(transfer_from[cnt], 1); | |
1704 | warntype_from_space[cnt] = | |
1705 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1706 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1707 | dquot_decr_space(transfer_from[cnt], cur_space); |
1708 | dquot_free_reserved_space(transfer_from[cnt], | |
1709 | rsv_space); | |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1713 | dquot_incr_space(transfer_to[cnt], cur_space); |
1714 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1715 | |
1716 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1717 | } | |
1da177e4 | 1718 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1719 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1720 | ||
dc52dd3a DM |
1721 | mark_all_dquot_dirty(transfer_from); |
1722 | mark_all_dquot_dirty(transfer_to); | |
1723 | /* The reference we got is transferred to the inode */ | |
1724 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1725 | transfer_to[cnt] = NULL; | |
cc33412f | 1726 | warn_put_all: |
657d3bfa JK |
1727 | flush_warnings(transfer_to, warntype_to); |
1728 | flush_warnings(transfer_from, warntype_from_inodes); | |
1729 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1730 | put_all: |
dc52dd3a DM |
1731 | dqput_all(transfer_from); |
1732 | dqput_all(transfer_to); | |
1da177e4 | 1733 | return ret; |
cc33412f JK |
1734 | over_quota: |
1735 | spin_unlock(&dq_data_lock); | |
1736 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1737 | /* Clear dquot pointers we don't want to dqput() */ | |
1738 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1739 | transfer_from[cnt] = NULL; |
cc33412f JK |
1740 | ret = NO_QUOTA; |
1741 | goto warn_put_all; | |
1da177e4 | 1742 | } |
08d0350c | 1743 | EXPORT_SYMBOL(dquot_transfer); |
1da177e4 | 1744 | |
b85f4b87 JK |
1745 | /* Wrapper for transferring ownership of an inode */ |
1746 | int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) | |
1747 | { | |
f55abc0f | 1748 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
b85f4b87 JK |
1749 | vfs_dq_init(inode); |
1750 | if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) | |
1751 | return 1; | |
1752 | } | |
1753 | return 0; | |
1754 | } | |
08d0350c | 1755 | EXPORT_SYMBOL(vfs_dq_transfer); |
b85f4b87 | 1756 | |
1da177e4 LT |
1757 | /* |
1758 | * Write info of quota file to disk | |
1759 | */ | |
1760 | int dquot_commit_info(struct super_block *sb, int type) | |
1761 | { | |
1762 | int ret; | |
1763 | struct quota_info *dqopt = sb_dqopt(sb); | |
1764 | ||
d3be915f | 1765 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1766 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1767 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1768 | return ret; |
1769 | } | |
08d0350c | 1770 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1771 | |
1772 | /* | |
1773 | * Definitions of diskquota operations. | |
1774 | */ | |
61e225dc | 1775 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1776 | .initialize = dquot_initialize, |
1777 | .drop = dquot_drop, | |
1778 | .alloc_space = dquot_alloc_space, | |
1779 | .alloc_inode = dquot_alloc_inode, | |
1780 | .free_space = dquot_free_space, | |
1781 | .free_inode = dquot_free_inode, | |
1782 | .transfer = dquot_transfer, | |
1783 | .write_dquot = dquot_commit, | |
1784 | .acquire_dquot = dquot_acquire, | |
1785 | .release_dquot = dquot_release, | |
1786 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1787 | .write_info = dquot_commit_info, |
1788 | .alloc_dquot = dquot_alloc, | |
1789 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1790 | }; |
1791 | ||
1da177e4 LT |
1792 | /* |
1793 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1794 | */ | |
f55abc0f | 1795 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1796 | { |
0ff5af83 | 1797 | int cnt, ret = 0; |
1da177e4 LT |
1798 | struct quota_info *dqopt = sb_dqopt(sb); |
1799 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1800 | |
f55abc0f JK |
1801 | /* Cannot turn off usage accounting without turning off limits, or |
1802 | * suspend quotas and simultaneously turn quotas off. */ | |
1803 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1804 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1805 | DQUOT_USAGE_ENABLED))) | |
1806 | return -EINVAL; | |
1807 | ||
1da177e4 | 1808 | /* We need to serialize quota_off() for device */ |
d3be915f | 1809 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1810 | |
1811 | /* | |
1812 | * Skip everything if there's nothing to do. We have to do this because | |
1813 | * sometimes we are called when fill_super() failed and calling | |
1814 | * sync_fs() in such cases does no good. | |
1815 | */ | |
f55abc0f | 1816 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1817 | mutex_unlock(&dqopt->dqonoff_mutex); |
1818 | return 0; | |
1819 | } | |
1da177e4 LT |
1820 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1821 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1822 | if (type != -1 && cnt != type) |
1823 | continue; | |
f55abc0f | 1824 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1825 | continue; |
f55abc0f JK |
1826 | |
1827 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1828 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1829 | dqopt->flags |= |
1830 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1831 | spin_unlock(&dq_state_lock); |
f55abc0f | 1832 | } else { |
cc33412f | 1833 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1834 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1835 | /* Turning off suspended quotas? */ | |
1836 | if (!sb_has_quota_loaded(sb, cnt) && | |
1837 | sb_has_quota_suspended(sb, cnt)) { | |
1838 | dqopt->flags &= ~dquot_state_flag( | |
1839 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1840 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1841 | iput(dqopt->files[cnt]); |
1842 | dqopt->files[cnt] = NULL; | |
1843 | continue; | |
1844 | } | |
cc33412f | 1845 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1846 | } |
f55abc0f JK |
1847 | |
1848 | /* We still have to keep quota loaded? */ | |
1849 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1850 | continue; |
1da177e4 LT |
1851 | |
1852 | /* Note: these are blocking operations */ | |
1853 | drop_dquot_ref(sb, cnt); | |
1854 | invalidate_dquots(sb, cnt); | |
1855 | /* | |
268157ba JK |
1856 | * Now all dquots should be invalidated, all writes done so we |
1857 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
1858 | */ |
1859 | if (info_dirty(&dqopt->info[cnt])) | |
1860 | sb->dq_op->write_info(sb, cnt); | |
1861 | if (dqopt->ops[cnt]->free_file_info) | |
1862 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1863 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1864 | ||
1865 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1866 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1867 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1868 | dqopt->info[cnt].dqi_flags = 0; |
1869 | dqopt->info[cnt].dqi_igrace = 0; | |
1870 | dqopt->info[cnt].dqi_bgrace = 0; | |
1871 | dqopt->ops[cnt] = NULL; | |
1872 | } | |
d3be915f | 1873 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1874 | |
1875 | /* Skip syncing and setting flags if quota files are hidden */ | |
1876 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1877 | goto put_inodes; | |
1878 | ||
1da177e4 | 1879 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1880 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1881 | if (sb->s_op->sync_fs) |
1882 | sb->s_op->sync_fs(sb, 1); | |
1883 | sync_blockdev(sb->s_bdev); | |
1884 | /* Now the quota files are just ordinary files and we can set the | |
1885 | * inode flags back. Moreover we discard the pagecache so that | |
1886 | * userspace sees the writes we did bypassing the pagecache. We | |
1887 | * must also discard the blockdev buffers so that we see the | |
1888 | * changes done by userspace on the next quotaon() */ | |
1889 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1890 | if (toputinode[cnt]) { | |
d3be915f | 1891 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1892 | /* If quota was reenabled in the meantime, we have |
1893 | * nothing to do */ | |
f55abc0f | 1894 | if (!sb_has_quota_loaded(sb, cnt)) { |
268157ba JK |
1895 | mutex_lock_nested(&toputinode[cnt]->i_mutex, |
1896 | I_MUTEX_QUOTA); | |
1da177e4 LT |
1897 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1898 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
1899 | truncate_inode_pages(&toputinode[cnt]->i_data, |
1900 | 0); | |
1b1dcc1b | 1901 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1902 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1903 | } |
d3be915f | 1904 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1905 | } |
1906 | if (sb->s_bdev) | |
1907 | invalidate_bdev(sb->s_bdev); | |
1908 | put_inodes: | |
1909 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1910 | if (toputinode[cnt]) { | |
0ff5af83 | 1911 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1912 | * can reenable quota on the subsequent remount RW. We |
1913 | * have to check 'flags' variable and not use sb_has_ | |
1914 | * function because another quotaon / quotaoff could | |
1915 | * change global state before we got here. We refuse | |
1916 | * to suspend quotas when there is pending delete on | |
1917 | * the quota file... */ | |
1918 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1919 | iput(toputinode[cnt]); |
1920 | else if (!toputinode[cnt]->i_nlink) | |
1921 | ret = -EBUSY; | |
1da177e4 | 1922 | } |
0ff5af83 | 1923 | return ret; |
1da177e4 | 1924 | } |
08d0350c | 1925 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 1926 | |
f55abc0f JK |
1927 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1928 | { | |
1929 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1930 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1931 | } | |
08d0350c | 1932 | EXPORT_SYMBOL(vfs_quota_off); |
1da177e4 LT |
1933 | /* |
1934 | * Turn quotas on on a device | |
1935 | */ | |
1936 | ||
f55abc0f JK |
1937 | /* |
1938 | * Helper function to turn quotas on when we already have the inode of | |
1939 | * quota file and no quota information is loaded. | |
1940 | */ | |
1941 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1942 | unsigned int flags) | |
1da177e4 LT |
1943 | { |
1944 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1945 | struct super_block *sb = inode->i_sb; | |
1946 | struct quota_info *dqopt = sb_dqopt(sb); | |
1947 | int error; | |
1948 | int oldflags = -1; | |
1949 | ||
1950 | if (!fmt) | |
1951 | return -ESRCH; | |
1952 | if (!S_ISREG(inode->i_mode)) { | |
1953 | error = -EACCES; | |
1954 | goto out_fmt; | |
1955 | } | |
1956 | if (IS_RDONLY(inode)) { | |
1957 | error = -EROFS; | |
1958 | goto out_fmt; | |
1959 | } | |
1960 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
1961 | error = -EINVAL; | |
1962 | goto out_fmt; | |
1963 | } | |
f55abc0f JK |
1964 | /* Usage always has to be set... */ |
1965 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
1966 | error = -EINVAL; | |
1967 | goto out_fmt; | |
1968 | } | |
1da177e4 | 1969 | |
ca785ec6 JK |
1970 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
1971 | /* As we bypass the pagecache we must now flush the inode so | |
1972 | * that we see all the changes from userspace... */ | |
1973 | write_inode_now(inode, 1); | |
1974 | /* And now flush the block cache so that kernel sees the | |
1975 | * changes */ | |
1976 | invalidate_bdev(sb->s_bdev); | |
1977 | } | |
d3be915f | 1978 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 1979 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
1980 | error = -EBUSY; |
1981 | goto out_lock; | |
1982 | } | |
ca785ec6 JK |
1983 | |
1984 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
1985 | /* We don't want quota and atime on quota files (deadlocks | |
1986 | * possible) Also nobody should write to the file - we use | |
1987 | * special IO operations which ignore the immutable bit. */ | |
dee86565 | 1988 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
268157ba JK |
1989 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
1990 | S_NOQUOTA); | |
ca785ec6 | 1991 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 1992 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
1993 | /* |
1994 | * When S_NOQUOTA is set, remove dquot references as no more | |
1995 | * references can be added | |
1996 | */ | |
ca785ec6 JK |
1997 | sb->dq_op->drop(inode); |
1998 | } | |
1da177e4 LT |
1999 | |
2000 | error = -EIO; | |
2001 | dqopt->files[type] = igrab(inode); | |
2002 | if (!dqopt->files[type]) | |
2003 | goto out_lock; | |
2004 | error = -EINVAL; | |
2005 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2006 | goto out_file_init; | |
2007 | ||
2008 | dqopt->ops[type] = fmt->qf_ops; | |
2009 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2010 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2011 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2012 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2013 | error = dqopt->ops[type]->read_file_info(sb, type); |
2014 | if (error < 0) { | |
d3be915f | 2015 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2016 | goto out_file_init; |
2017 | } | |
d3be915f | 2018 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2019 | spin_lock(&dq_state_lock); |
f55abc0f | 2020 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2021 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2022 | |
2023 | add_dquot_ref(sb, type); | |
d3be915f | 2024 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2025 | |
2026 | return 0; | |
2027 | ||
2028 | out_file_init: | |
2029 | dqopt->files[type] = NULL; | |
2030 | iput(inode); | |
2031 | out_lock: | |
1da177e4 | 2032 | if (oldflags != -1) { |
dee86565 | 2033 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2034 | /* Set the flags back (in the case of accidental quotaon() |
2035 | * on a wrong file we don't want to mess up the flags) */ | |
2036 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2037 | inode->i_flags |= oldflags; | |
dee86565 | 2038 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2039 | } |
d01730d7 | 2040 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2041 | out_fmt: |
2042 | put_quota_format(fmt); | |
2043 | ||
2044 | return error; | |
2045 | } | |
2046 | ||
0ff5af83 JK |
2047 | /* Reenable quotas on remount RW */ |
2048 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2049 | { | |
2050 | struct quota_info *dqopt = sb_dqopt(sb); | |
2051 | struct inode *inode; | |
2052 | int ret; | |
f55abc0f | 2053 | unsigned int flags; |
0ff5af83 JK |
2054 | |
2055 | mutex_lock(&dqopt->dqonoff_mutex); | |
2056 | if (!sb_has_quota_suspended(sb, type)) { | |
2057 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2058 | return 0; | |
2059 | } | |
0ff5af83 JK |
2060 | inode = dqopt->files[type]; |
2061 | dqopt->files[type] = NULL; | |
cc33412f | 2062 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2063 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2064 | DQUOT_LIMITS_ENABLED, type); | |
2065 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2066 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2067 | mutex_unlock(&dqopt->dqonoff_mutex); |
2068 | ||
f55abc0f JK |
2069 | flags = dquot_generic_flag(flags, type); |
2070 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2071 | flags); | |
0ff5af83 JK |
2072 | iput(inode); |
2073 | ||
2074 | return ret; | |
2075 | } | |
2076 | ||
77e69dac AV |
2077 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2078 | struct path *path) | |
2079 | { | |
2080 | int error = security_quota_on(path->dentry); | |
2081 | if (error) | |
2082 | return error; | |
2083 | /* Quota file not on the same filesystem? */ | |
2084 | if (path->mnt->mnt_sb != sb) | |
2085 | error = -EXDEV; | |
2086 | else | |
f55abc0f JK |
2087 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2088 | format_id, DQUOT_USAGE_ENABLED | | |
2089 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2090 | return error; |
2091 | } | |
08d0350c | 2092 | EXPORT_SYMBOL(vfs_quota_on_path); |
77e69dac | 2093 | |
8264613d | 2094 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2095 | int remount) |
1da177e4 | 2096 | { |
8264613d | 2097 | struct path path; |
1da177e4 LT |
2098 | int error; |
2099 | ||
0ff5af83 JK |
2100 | if (remount) |
2101 | return vfs_quota_on_remount(sb, type); | |
2102 | ||
8264613d | 2103 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2104 | if (!error) { |
8264613d AV |
2105 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2106 | path_put(&path); | |
77e69dac | 2107 | } |
1da177e4 LT |
2108 | return error; |
2109 | } | |
08d0350c | 2110 | EXPORT_SYMBOL(vfs_quota_on); |
1da177e4 | 2111 | |
f55abc0f JK |
2112 | /* |
2113 | * More powerful function for turning on quotas allowing setting | |
2114 | * of individual quota flags | |
2115 | */ | |
2116 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2117 | unsigned int flags) | |
2118 | { | |
2119 | int ret = 0; | |
2120 | struct super_block *sb = inode->i_sb; | |
2121 | struct quota_info *dqopt = sb_dqopt(sb); | |
2122 | ||
2123 | /* Just unsuspend quotas? */ | |
2124 | if (flags & DQUOT_SUSPENDED) | |
2125 | return vfs_quota_on_remount(sb, type); | |
2126 | if (!flags) | |
2127 | return 0; | |
2128 | /* Just updating flags needed? */ | |
2129 | if (sb_has_quota_loaded(sb, type)) { | |
2130 | mutex_lock(&dqopt->dqonoff_mutex); | |
2131 | /* Now do a reliable test... */ | |
2132 | if (!sb_has_quota_loaded(sb, type)) { | |
2133 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2134 | goto load_quota; | |
2135 | } | |
2136 | if (flags & DQUOT_USAGE_ENABLED && | |
2137 | sb_has_quota_usage_enabled(sb, type)) { | |
2138 | ret = -EBUSY; | |
2139 | goto out_lock; | |
2140 | } | |
2141 | if (flags & DQUOT_LIMITS_ENABLED && | |
2142 | sb_has_quota_limits_enabled(sb, type)) { | |
2143 | ret = -EBUSY; | |
2144 | goto out_lock; | |
2145 | } | |
cc33412f | 2146 | spin_lock(&dq_state_lock); |
f55abc0f | 2147 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2148 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2149 | out_lock: |
2150 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2151 | return ret; | |
2152 | } | |
2153 | ||
2154 | load_quota: | |
2155 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2156 | } | |
08d0350c | 2157 | EXPORT_SYMBOL(vfs_quota_enable); |
f55abc0f | 2158 | |
1da177e4 LT |
2159 | /* |
2160 | * This function is used when filesystem needs to initialize quotas | |
2161 | * during mount time. | |
2162 | */ | |
84de856e CH |
2163 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2164 | int format_id, int type) | |
1da177e4 | 2165 | { |
84de856e | 2166 | struct dentry *dentry; |
1da177e4 LT |
2167 | int error; |
2168 | ||
c56818d7 | 2169 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2170 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2171 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2172 | if (IS_ERR(dentry)) |
2173 | return PTR_ERR(dentry); | |
2174 | ||
154f484b JK |
2175 | if (!dentry->d_inode) { |
2176 | error = -ENOENT; | |
2177 | goto out; | |
2178 | } | |
2179 | ||
1da177e4 | 2180 | error = security_quota_on(dentry); |
84de856e | 2181 | if (!error) |
f55abc0f JK |
2182 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2183 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2184 | |
154f484b | 2185 | out: |
84de856e CH |
2186 | dput(dentry); |
2187 | return error; | |
1da177e4 | 2188 | } |
08d0350c | 2189 | EXPORT_SYMBOL(vfs_quota_on_mount); |
1da177e4 | 2190 | |
b85f4b87 JK |
2191 | /* Wrapper to turn on quotas when remounting rw */ |
2192 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2193 | { | |
2194 | int cnt; | |
2195 | int ret = 0, err; | |
2196 | ||
2197 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2198 | return -ENOSYS; | |
2199 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2200 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2201 | if (err < 0 && !ret) | |
2202 | ret = err; | |
2203 | } | |
2204 | return ret; | |
2205 | } | |
08d0350c | 2206 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |
b85f4b87 | 2207 | |
12095460 JK |
2208 | static inline qsize_t qbtos(qsize_t blocks) |
2209 | { | |
2210 | return blocks << QIF_DQBLKSIZE_BITS; | |
2211 | } | |
2212 | ||
2213 | static inline qsize_t stoqb(qsize_t space) | |
2214 | { | |
2215 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2216 | } | |
2217 | ||
1da177e4 LT |
2218 | /* Generic routine for getting common part of quota structure */ |
2219 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2220 | { | |
2221 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2222 | ||
2223 | spin_lock(&dq_data_lock); | |
12095460 JK |
2224 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2225 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
f18df228 | 2226 | di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; |
1da177e4 LT |
2227 | di->dqb_ihardlimit = dm->dqb_ihardlimit; |
2228 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2229 | di->dqb_curinodes = dm->dqb_curinodes; | |
2230 | di->dqb_btime = dm->dqb_btime; | |
2231 | di->dqb_itime = dm->dqb_itime; | |
2232 | di->dqb_valid = QIF_ALL; | |
2233 | spin_unlock(&dq_data_lock); | |
2234 | } | |
2235 | ||
268157ba JK |
2236 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, |
2237 | struct if_dqblk *di) | |
1da177e4 LT |
2238 | { |
2239 | struct dquot *dquot; | |
2240 | ||
cc33412f | 2241 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2242 | if (!dquot) |
1da177e4 | 2243 | return -ESRCH; |
1da177e4 LT |
2244 | do_get_dqblk(dquot, di); |
2245 | dqput(dquot); | |
cc33412f | 2246 | |
1da177e4 LT |
2247 | return 0; |
2248 | } | |
08d0350c | 2249 | EXPORT_SYMBOL(vfs_get_dqblk); |
1da177e4 LT |
2250 | |
2251 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2252 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2253 | { |
2254 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2255 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2256 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2257 | ||
2258 | if ((di->dqb_valid & QIF_BLIMITS && | |
2259 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2260 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2261 | (di->dqb_valid & QIF_ILIMITS && | |
2262 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2263 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2264 | return -ERANGE; | |
1da177e4 LT |
2265 | |
2266 | spin_lock(&dq_data_lock); | |
2267 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2268 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2269 | check_blim = 1; |
4d59bce4 | 2270 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2271 | } |
2272 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2273 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2274 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2275 | check_blim = 1; |
4d59bce4 | 2276 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2277 | } |
2278 | if (di->dqb_valid & QIF_INODES) { | |
2279 | dm->dqb_curinodes = di->dqb_curinodes; | |
2280 | check_ilim = 1; | |
4d59bce4 | 2281 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2282 | } |
2283 | if (di->dqb_valid & QIF_ILIMITS) { | |
2284 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2285 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2286 | check_ilim = 1; | |
4d59bce4 | 2287 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2288 | } |
4d59bce4 | 2289 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2290 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2291 | check_blim = 1; |
4d59bce4 JK |
2292 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2293 | } | |
2294 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2295 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2296 | check_ilim = 1; |
4d59bce4 JK |
2297 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2298 | } | |
1da177e4 LT |
2299 | |
2300 | if (check_blim) { | |
268157ba JK |
2301 | if (!dm->dqb_bsoftlimit || |
2302 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2303 | dm->dqb_btime = 0; |
2304 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
268157ba JK |
2305 | } else if (!(di->dqb_valid & QIF_BTIME)) |
2306 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2307 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2308 | } |
2309 | if (check_ilim) { | |
268157ba JK |
2310 | if (!dm->dqb_isoftlimit || |
2311 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2312 | dm->dqb_itime = 0; |
2313 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
268157ba JK |
2314 | } else if (!(di->dqb_valid & QIF_ITIME)) |
2315 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2316 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2317 | } |
268157ba JK |
2318 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2319 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2320 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2321 | else | |
2322 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2323 | spin_unlock(&dq_data_lock); | |
2324 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2325 | |
2326 | return 0; | |
1da177e4 LT |
2327 | } |
2328 | ||
268157ba JK |
2329 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, |
2330 | struct if_dqblk *di) | |
1da177e4 LT |
2331 | { |
2332 | struct dquot *dquot; | |
338bf9af | 2333 | int rc; |
1da177e4 | 2334 | |
f55abc0f JK |
2335 | dquot = dqget(sb, id, type); |
2336 | if (!dquot) { | |
2337 | rc = -ESRCH; | |
2338 | goto out; | |
1da177e4 | 2339 | } |
338bf9af | 2340 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2341 | dqput(dquot); |
f55abc0f | 2342 | out: |
338bf9af | 2343 | return rc; |
1da177e4 | 2344 | } |
08d0350c | 2345 | EXPORT_SYMBOL(vfs_set_dqblk); |
1da177e4 LT |
2346 | |
2347 | /* Generic routine for getting common part of quota file information */ | |
2348 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2349 | { | |
2350 | struct mem_dqinfo *mi; | |
2351 | ||
d3be915f | 2352 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2353 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2354 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2355 | return -ESRCH; |
2356 | } | |
2357 | mi = sb_dqopt(sb)->info + type; | |
2358 | spin_lock(&dq_data_lock); | |
2359 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2360 | ii->dqi_igrace = mi->dqi_igrace; | |
2361 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2362 | ii->dqi_valid = IIF_ALL; | |
2363 | spin_unlock(&dq_data_lock); | |
d3be915f | 2364 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2365 | return 0; |
2366 | } | |
08d0350c | 2367 | EXPORT_SYMBOL(vfs_get_dqinfo); |
1da177e4 LT |
2368 | |
2369 | /* Generic routine for setting common part of quota file information */ | |
2370 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2371 | { | |
2372 | struct mem_dqinfo *mi; | |
f55abc0f | 2373 | int err = 0; |
1da177e4 | 2374 | |
d3be915f | 2375 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2376 | if (!sb_has_quota_active(sb, type)) { |
2377 | err = -ESRCH; | |
2378 | goto out; | |
1da177e4 LT |
2379 | } |
2380 | mi = sb_dqopt(sb)->info + type; | |
2381 | spin_lock(&dq_data_lock); | |
2382 | if (ii->dqi_valid & IIF_BGRACE) | |
2383 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2384 | if (ii->dqi_valid & IIF_IGRACE) | |
2385 | mi->dqi_igrace = ii->dqi_igrace; | |
2386 | if (ii->dqi_valid & IIF_FLAGS) | |
268157ba JK |
2387 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | |
2388 | (ii->dqi_flags & DQF_MASK); | |
1da177e4 LT |
2389 | spin_unlock(&dq_data_lock); |
2390 | mark_info_dirty(sb, type); | |
2391 | /* Force write to disk */ | |
2392 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2393 | out: |
d3be915f | 2394 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2395 | return err; |
1da177e4 | 2396 | } |
08d0350c | 2397 | EXPORT_SYMBOL(vfs_set_dqinfo); |
1da177e4 | 2398 | |
0d54b217 | 2399 | const struct quotactl_ops vfs_quotactl_ops = { |
1da177e4 LT |
2400 | .quota_on = vfs_quota_on, |
2401 | .quota_off = vfs_quota_off, | |
2402 | .quota_sync = vfs_quota_sync, | |
2403 | .get_info = vfs_get_dqinfo, | |
2404 | .set_info = vfs_set_dqinfo, | |
2405 | .get_dqblk = vfs_get_dqblk, | |
2406 | .set_dqblk = vfs_set_dqblk | |
2407 | }; | |
2408 | ||
2409 | static ctl_table fs_dqstats_table[] = { | |
2410 | { | |
1da177e4 LT |
2411 | .procname = "lookups", |
2412 | .data = &dqstats.lookups, | |
2413 | .maxlen = sizeof(int), | |
2414 | .mode = 0444, | |
6d456111 | 2415 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2416 | }, |
2417 | { | |
1da177e4 LT |
2418 | .procname = "drops", |
2419 | .data = &dqstats.drops, | |
2420 | .maxlen = sizeof(int), | |
2421 | .mode = 0444, | |
6d456111 | 2422 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2423 | }, |
2424 | { | |
1da177e4 LT |
2425 | .procname = "reads", |
2426 | .data = &dqstats.reads, | |
2427 | .maxlen = sizeof(int), | |
2428 | .mode = 0444, | |
6d456111 | 2429 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2430 | }, |
2431 | { | |
1da177e4 LT |
2432 | .procname = "writes", |
2433 | .data = &dqstats.writes, | |
2434 | .maxlen = sizeof(int), | |
2435 | .mode = 0444, | |
6d456111 | 2436 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2437 | }, |
2438 | { | |
1da177e4 LT |
2439 | .procname = "cache_hits", |
2440 | .data = &dqstats.cache_hits, | |
2441 | .maxlen = sizeof(int), | |
2442 | .mode = 0444, | |
6d456111 | 2443 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2444 | }, |
2445 | { | |
1da177e4 LT |
2446 | .procname = "allocated_dquots", |
2447 | .data = &dqstats.allocated_dquots, | |
2448 | .maxlen = sizeof(int), | |
2449 | .mode = 0444, | |
6d456111 | 2450 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2451 | }, |
2452 | { | |
1da177e4 LT |
2453 | .procname = "free_dquots", |
2454 | .data = &dqstats.free_dquots, | |
2455 | .maxlen = sizeof(int), | |
2456 | .mode = 0444, | |
6d456111 | 2457 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2458 | }, |
2459 | { | |
1da177e4 LT |
2460 | .procname = "syncs", |
2461 | .data = &dqstats.syncs, | |
2462 | .maxlen = sizeof(int), | |
2463 | .mode = 0444, | |
6d456111 | 2464 | .proc_handler = proc_dointvec, |
1da177e4 | 2465 | }, |
8e893469 | 2466 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2467 | { |
1da177e4 LT |
2468 | .procname = "warnings", |
2469 | .data = &flag_print_warnings, | |
2470 | .maxlen = sizeof(int), | |
2471 | .mode = 0644, | |
6d456111 | 2472 | .proc_handler = proc_dointvec, |
1da177e4 | 2473 | }, |
8e893469 | 2474 | #endif |
ab09203e | 2475 | { }, |
1da177e4 LT |
2476 | }; |
2477 | ||
2478 | static ctl_table fs_table[] = { | |
2479 | { | |
1da177e4 LT |
2480 | .procname = "quota", |
2481 | .mode = 0555, | |
2482 | .child = fs_dqstats_table, | |
2483 | }, | |
ab09203e | 2484 | { }, |
1da177e4 LT |
2485 | }; |
2486 | ||
2487 | static ctl_table sys_table[] = { | |
2488 | { | |
1da177e4 LT |
2489 | .procname = "fs", |
2490 | .mode = 0555, | |
2491 | .child = fs_table, | |
2492 | }, | |
ab09203e | 2493 | { }, |
1da177e4 LT |
2494 | }; |
2495 | ||
2496 | static int __init dquot_init(void) | |
2497 | { | |
2498 | int i; | |
2499 | unsigned long nr_hash, order; | |
2500 | ||
2501 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2502 | ||
0b4d4147 | 2503 | register_sysctl_table(sys_table); |
1da177e4 | 2504 | |
20c2df83 | 2505 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2506 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2507 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2508 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2509 | NULL); |
1da177e4 LT |
2510 | |
2511 | order = 0; | |
2512 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2513 | if (!dquot_hash) | |
2514 | panic("Cannot create dquot hash table"); | |
2515 | ||
2516 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2517 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2518 | dq_hash_bits = 0; | |
2519 | do { | |
2520 | dq_hash_bits++; | |
2521 | } while (nr_hash >> dq_hash_bits); | |
2522 | dq_hash_bits--; | |
2523 | ||
2524 | nr_hash = 1UL << dq_hash_bits; | |
2525 | dq_hash_mask = nr_hash - 1; | |
2526 | for (i = 0; i < nr_hash; i++) | |
2527 | INIT_HLIST_HEAD(dquot_hash + i); | |
2528 | ||
2529 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2530 | nr_hash, order, (PAGE_SIZE << order)); | |
2531 | ||
8e1f936b | 2532 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2533 | |
2534 | return 0; | |
2535 | } | |
2536 | module_init(dquot_init); |