Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
74 | #include <linux/kmod.h> | |
75 | #include <linux/namei.h> | |
76 | #include <linux/buffer_head.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
fb58b731 | 79 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
1da177e4 LT |
80 | |
81 | #include <asm/uaccess.h> | |
82 | ||
83 | #define __DQUOT_PARANOIA | |
84 | ||
85 | /* | |
cc33412f JK |
86 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
87 | * and quota formats, dqstats structure containing statistics about the lists | |
88 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and | |
89 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 90 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
91 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
92 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
93 | * about latest values take it as well. | |
1da177e4 | 94 | * |
cc33412f JK |
95 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
96 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
97 | * |
98 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
99 | * the life of the dquot structure and so needn't to be protected by a lock | |
100 | * | |
101 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
102 | * operation is just reading pointers from inode (or not using them at all) the | |
103 | * read lock is enough. If pointers are altered function must hold write lock | |
104 | * (these locking rules also apply for S_NOQUOTA flag in the inode - note that | |
cc33412f | 105 | * for altering the flag i_mutex is also needed). |
1da177e4 | 106 | * |
d3be915f | 107 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
108 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
109 | * Currently dquot is locked only when it is being read to memory (or space for | |
110 | * it is being allocated) on the first dqget() and when it is being released on | |
111 | * the last dqput(). The allocation and release oparations are serialized by | |
112 | * the dq_lock and by checking the use count in dquot_release(). Write | |
113 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
114 | * spinlock to internal buffers before writing. | |
115 | * | |
116 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
117 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
118 | * dqio_mutex | |
cc33412f JK |
119 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
120 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
121 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
122 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
123 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
124 | * called with dqptr_sem held. | |
d3be915f | 125 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
126 | */ |
127 | ||
c516610c JK |
128 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
129 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
130 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 131 | EXPORT_SYMBOL(dq_data_lock); |
1da177e4 LT |
132 | |
133 | static char *quotatypes[] = INITQFNAMES; | |
134 | static struct quota_format_type *quota_formats; /* List of registered formats */ | |
135 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
136 | ||
137 | /* SLAB cache for dquot structures */ | |
e18b890b | 138 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
139 | |
140 | int register_quota_format(struct quota_format_type *fmt) | |
141 | { | |
142 | spin_lock(&dq_list_lock); | |
143 | fmt->qf_next = quota_formats; | |
144 | quota_formats = fmt; | |
145 | spin_unlock(&dq_list_lock); | |
146 | return 0; | |
147 | } | |
08d0350c | 148 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
149 | |
150 | void unregister_quota_format(struct quota_format_type *fmt) | |
151 | { | |
152 | struct quota_format_type **actqf; | |
153 | ||
154 | spin_lock(&dq_list_lock); | |
268157ba JK |
155 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
156 | actqf = &(*actqf)->qf_next) | |
157 | ; | |
1da177e4 LT |
158 | if (*actqf) |
159 | *actqf = (*actqf)->qf_next; | |
160 | spin_unlock(&dq_list_lock); | |
161 | } | |
08d0350c | 162 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
163 | |
164 | static struct quota_format_type *find_quota_format(int id) | |
165 | { | |
166 | struct quota_format_type *actqf; | |
167 | ||
168 | spin_lock(&dq_list_lock); | |
268157ba JK |
169 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
170 | actqf = actqf->qf_next) | |
171 | ; | |
1da177e4 LT |
172 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
173 | int qm; | |
174 | ||
175 | spin_unlock(&dq_list_lock); | |
176 | ||
268157ba JK |
177 | for (qm = 0; module_names[qm].qm_fmt_id && |
178 | module_names[qm].qm_fmt_id != id; qm++) | |
179 | ; | |
180 | if (!module_names[qm].qm_fmt_id || | |
181 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
182 | return NULL; |
183 | ||
184 | spin_lock(&dq_list_lock); | |
268157ba JK |
185 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
186 | actqf = actqf->qf_next) | |
187 | ; | |
1da177e4 LT |
188 | if (actqf && !try_module_get(actqf->qf_owner)) |
189 | actqf = NULL; | |
190 | } | |
191 | spin_unlock(&dq_list_lock); | |
192 | return actqf; | |
193 | } | |
194 | ||
195 | static void put_quota_format(struct quota_format_type *fmt) | |
196 | { | |
197 | module_put(fmt->qf_owner); | |
198 | } | |
199 | ||
200 | /* | |
201 | * Dquot List Management: | |
202 | * The quota code uses three lists for dquot management: the inuse_list, | |
203 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
204 | * on all three lists, depending on its current state. | |
205 | * | |
206 | * All dquots are placed to the end of inuse_list when first created, and this | |
207 | * list is used for invalidate operation, which must look at every dquot. | |
208 | * | |
209 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
210 | * and this list is searched whenever we need an available dquot. Dquots are | |
211 | * removed from the list as soon as they are used again, and | |
212 | * dqstats.free_dquots gives the number of dquots on the list. When | |
213 | * dquot is invalidated it's completely released from memory. | |
214 | * | |
215 | * Dquots with a specific identity (device, type and id) are placed on | |
216 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
217 | * mechanism to locate a specific dquot. | |
218 | */ | |
219 | ||
220 | static LIST_HEAD(inuse_list); | |
221 | static LIST_HEAD(free_dquots); | |
222 | static unsigned int dq_hash_bits, dq_hash_mask; | |
223 | static struct hlist_head *dquot_hash; | |
224 | ||
225 | struct dqstats dqstats; | |
08d0350c | 226 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 227 | |
1da177e4 LT |
228 | static inline unsigned int |
229 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
230 | { | |
231 | unsigned long tmp; | |
232 | ||
233 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
234 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Following list functions expect dq_list_lock to be held | |
239 | */ | |
240 | static inline void insert_dquot_hash(struct dquot *dquot) | |
241 | { | |
268157ba JK |
242 | struct hlist_head *head; |
243 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
1da177e4 LT |
244 | hlist_add_head(&dquot->dq_hash, head); |
245 | } | |
246 | ||
247 | static inline void remove_dquot_hash(struct dquot *dquot) | |
248 | { | |
249 | hlist_del_init(&dquot->dq_hash); | |
250 | } | |
251 | ||
7a2435d8 JK |
252 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
253 | unsigned int id, int type) | |
1da177e4 LT |
254 | { |
255 | struct hlist_node *node; | |
256 | struct dquot *dquot; | |
257 | ||
258 | hlist_for_each (node, dquot_hash+hashent) { | |
259 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
268157ba JK |
260 | if (dquot->dq_sb == sb && dquot->dq_id == id && |
261 | dquot->dq_type == type) | |
1da177e4 LT |
262 | return dquot; |
263 | } | |
dd6f3c6d | 264 | return NULL; |
1da177e4 LT |
265 | } |
266 | ||
267 | /* Add a dquot to the tail of the free list */ | |
268 | static inline void put_dquot_last(struct dquot *dquot) | |
269 | { | |
8e13059a | 270 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
271 | dqstats.free_dquots++; |
272 | } | |
273 | ||
274 | static inline void remove_free_dquot(struct dquot *dquot) | |
275 | { | |
276 | if (list_empty(&dquot->dq_free)) | |
277 | return; | |
278 | list_del_init(&dquot->dq_free); | |
279 | dqstats.free_dquots--; | |
280 | } | |
281 | ||
282 | static inline void put_inuse(struct dquot *dquot) | |
283 | { | |
284 | /* We add to the back of inuse list so we don't have to restart | |
285 | * when traversing this list and we block */ | |
8e13059a | 286 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
287 | dqstats.allocated_dquots++; |
288 | } | |
289 | ||
290 | static inline void remove_inuse(struct dquot *dquot) | |
291 | { | |
292 | dqstats.allocated_dquots--; | |
293 | list_del(&dquot->dq_inuse); | |
294 | } | |
295 | /* | |
296 | * End of list functions needing dq_list_lock | |
297 | */ | |
298 | ||
299 | static void wait_on_dquot(struct dquot *dquot) | |
300 | { | |
d3be915f IM |
301 | mutex_lock(&dquot->dq_lock); |
302 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
303 | } |
304 | ||
03f6e92b JK |
305 | static inline int dquot_dirty(struct dquot *dquot) |
306 | { | |
307 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
308 | } | |
309 | ||
310 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
311 | { | |
312 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
313 | } | |
1da177e4 LT |
314 | |
315 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
316 | { | |
317 | spin_lock(&dq_list_lock); | |
318 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
319 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
320 | info[dquot->dq_type].dqi_dirty_list); | |
321 | spin_unlock(&dq_list_lock); | |
322 | return 0; | |
323 | } | |
08d0350c | 324 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 325 | |
dc52dd3a DM |
326 | /* Dirtify all the dquots - this can block when journalling */ |
327 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
328 | { | |
329 | int ret, err, cnt; | |
330 | ||
331 | ret = err = 0; | |
332 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
333 | if (dquot[cnt]) | |
334 | /* Even in case of error we have to continue */ | |
335 | ret = mark_dquot_dirty(dquot[cnt]); | |
336 | if (!err) | |
337 | err = ret; | |
338 | } | |
339 | return err; | |
340 | } | |
341 | ||
342 | static inline void dqput_all(struct dquot **dquot) | |
343 | { | |
344 | unsigned int cnt; | |
345 | ||
346 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
347 | dqput(dquot[cnt]); | |
348 | } | |
349 | ||
1da177e4 LT |
350 | /* This function needs dq_list_lock */ |
351 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
352 | { | |
353 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
354 | return 0; | |
355 | list_del_init(&dquot->dq_dirty); | |
356 | return 1; | |
357 | } | |
358 | ||
359 | void mark_info_dirty(struct super_block *sb, int type) | |
360 | { | |
361 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
362 | } | |
363 | EXPORT_SYMBOL(mark_info_dirty); | |
364 | ||
365 | /* | |
366 | * Read dquot from disk and alloc space for it | |
367 | */ | |
368 | ||
369 | int dquot_acquire(struct dquot *dquot) | |
370 | { | |
371 | int ret = 0, ret2 = 0; | |
372 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
373 | ||
d3be915f IM |
374 | mutex_lock(&dquot->dq_lock); |
375 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
376 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
377 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
378 | if (ret < 0) | |
379 | goto out_iolock; | |
380 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
381 | /* Instantiate dquot if needed */ | |
382 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
383 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
384 | /* Write the info if needed */ | |
268157ba JK |
385 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
386 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
387 | dquot->dq_sb, dquot->dq_type); | |
388 | } | |
1da177e4 LT |
389 | if (ret < 0) |
390 | goto out_iolock; | |
391 | if (ret2 < 0) { | |
392 | ret = ret2; | |
393 | goto out_iolock; | |
394 | } | |
395 | } | |
396 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
397 | out_iolock: | |
d3be915f IM |
398 | mutex_unlock(&dqopt->dqio_mutex); |
399 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
400 | return ret; |
401 | } | |
08d0350c | 402 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
403 | |
404 | /* | |
405 | * Write dquot to disk | |
406 | */ | |
407 | int dquot_commit(struct dquot *dquot) | |
408 | { | |
409 | int ret = 0, ret2 = 0; | |
410 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
411 | ||
d3be915f | 412 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
413 | spin_lock(&dq_list_lock); |
414 | if (!clear_dquot_dirty(dquot)) { | |
415 | spin_unlock(&dq_list_lock); | |
416 | goto out_sem; | |
417 | } | |
418 | spin_unlock(&dq_list_lock); | |
419 | /* Inactive dquot can be only if there was error during read/init | |
420 | * => we have better not writing it */ | |
421 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
422 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
268157ba JK |
423 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
424 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
425 | dquot->dq_sb, dquot->dq_type); | |
426 | } | |
1da177e4 LT |
427 | if (ret >= 0) |
428 | ret = ret2; | |
429 | } | |
430 | out_sem: | |
d3be915f | 431 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
432 | return ret; |
433 | } | |
08d0350c | 434 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
435 | |
436 | /* | |
437 | * Release dquot | |
438 | */ | |
439 | int dquot_release(struct dquot *dquot) | |
440 | { | |
441 | int ret = 0, ret2 = 0; | |
442 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
443 | ||
d3be915f | 444 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
445 | /* Check whether we are not racing with some other dqget() */ |
446 | if (atomic_read(&dquot->dq_count) > 1) | |
447 | goto out_dqlock; | |
d3be915f | 448 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
449 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
450 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
451 | /* Write the info */ | |
268157ba JK |
452 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
453 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
454 | dquot->dq_sb, dquot->dq_type); | |
455 | } | |
1da177e4 LT |
456 | if (ret >= 0) |
457 | ret = ret2; | |
458 | } | |
459 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 460 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 461 | out_dqlock: |
d3be915f | 462 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
463 | return ret; |
464 | } | |
08d0350c | 465 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 466 | |
7d9056ba | 467 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
468 | { |
469 | kmem_cache_free(dquot_cachep, dquot); | |
470 | } | |
7d9056ba | 471 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
472 | |
473 | static inline void do_destroy_dquot(struct dquot *dquot) | |
474 | { | |
475 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
476 | } | |
477 | ||
1da177e4 LT |
478 | /* Invalidate all dquots on the list. Note that this function is called after |
479 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
480 | * quota users. There can still be some users of quotas due to inodes being |
481 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 482 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 483 | */ |
1da177e4 LT |
484 | static void invalidate_dquots(struct super_block *sb, int type) |
485 | { | |
c33ed271 | 486 | struct dquot *dquot, *tmp; |
1da177e4 | 487 | |
6362e4d4 | 488 | restart: |
1da177e4 | 489 | spin_lock(&dq_list_lock); |
c33ed271 | 490 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
491 | if (dquot->dq_sb != sb) |
492 | continue; | |
493 | if (dquot->dq_type != type) | |
494 | continue; | |
6362e4d4 JK |
495 | /* Wait for dquot users */ |
496 | if (atomic_read(&dquot->dq_count)) { | |
497 | DEFINE_WAIT(wait); | |
498 | ||
499 | atomic_inc(&dquot->dq_count); | |
500 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
501 | TASK_UNINTERRUPTIBLE); | |
502 | spin_unlock(&dq_list_lock); | |
503 | /* Once dqput() wakes us up, we know it's time to free | |
504 | * the dquot. | |
505 | * IMPORTANT: we rely on the fact that there is always | |
506 | * at most one process waiting for dquot to free. | |
507 | * Otherwise dq_count would be > 1 and we would never | |
508 | * wake up. | |
509 | */ | |
510 | if (atomic_read(&dquot->dq_count) > 1) | |
511 | schedule(); | |
512 | finish_wait(&dquot->dq_wait_unused, &wait); | |
513 | dqput(dquot); | |
514 | /* At this moment dquot() need not exist (it could be | |
515 | * reclaimed by prune_dqcache(). Hence we must | |
516 | * restart. */ | |
517 | goto restart; | |
518 | } | |
519 | /* | |
520 | * Quota now has no users and it has been written on last | |
521 | * dqput() | |
522 | */ | |
1da177e4 LT |
523 | remove_dquot_hash(dquot); |
524 | remove_free_dquot(dquot); | |
525 | remove_inuse(dquot); | |
74f783af | 526 | do_destroy_dquot(dquot); |
1da177e4 LT |
527 | } |
528 | spin_unlock(&dq_list_lock); | |
529 | } | |
530 | ||
12c77527 JK |
531 | /* Call callback for every active dquot on given filesystem */ |
532 | int dquot_scan_active(struct super_block *sb, | |
533 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
534 | unsigned long priv) | |
535 | { | |
536 | struct dquot *dquot, *old_dquot = NULL; | |
537 | int ret = 0; | |
538 | ||
539 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
540 | spin_lock(&dq_list_lock); | |
541 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
542 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
543 | continue; | |
544 | if (dquot->dq_sb != sb) | |
545 | continue; | |
546 | /* Now we have active dquot so we can just increase use count */ | |
547 | atomic_inc(&dquot->dq_count); | |
548 | dqstats.lookups++; | |
549 | spin_unlock(&dq_list_lock); | |
550 | dqput(old_dquot); | |
551 | old_dquot = dquot; | |
552 | ret = fn(dquot, priv); | |
553 | if (ret < 0) | |
554 | goto out; | |
555 | spin_lock(&dq_list_lock); | |
556 | /* We are safe to continue now because our dquot could not | |
557 | * be moved out of the inuse list while we hold the reference */ | |
558 | } | |
559 | spin_unlock(&dq_list_lock); | |
560 | out: | |
561 | dqput(old_dquot); | |
562 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
563 | return ret; | |
564 | } | |
08d0350c | 565 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 566 | |
1da177e4 LT |
567 | int vfs_quota_sync(struct super_block *sb, int type) |
568 | { | |
569 | struct list_head *dirty; | |
570 | struct dquot *dquot; | |
571 | struct quota_info *dqopt = sb_dqopt(sb); | |
572 | int cnt; | |
573 | ||
d3be915f | 574 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
575 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
576 | if (type != -1 && cnt != type) | |
577 | continue; | |
f55abc0f | 578 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
579 | continue; |
580 | spin_lock(&dq_list_lock); | |
581 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
582 | while (!list_empty(dirty)) { | |
268157ba JK |
583 | dquot = list_first_entry(dirty, struct dquot, |
584 | dq_dirty); | |
1da177e4 LT |
585 | /* Dirty and inactive can be only bad dquot... */ |
586 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
587 | clear_dquot_dirty(dquot); | |
588 | continue; | |
589 | } | |
590 | /* Now we have active dquot from which someone is | |
591 | * holding reference so we can safely just increase | |
592 | * use count */ | |
593 | atomic_inc(&dquot->dq_count); | |
594 | dqstats.lookups++; | |
595 | spin_unlock(&dq_list_lock); | |
596 | sb->dq_op->write_dquot(dquot); | |
597 | dqput(dquot); | |
598 | spin_lock(&dq_list_lock); | |
599 | } | |
600 | spin_unlock(&dq_list_lock); | |
601 | } | |
602 | ||
603 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
604 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
605 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 LT |
606 | sb->dq_op->write_info(sb, cnt); |
607 | spin_lock(&dq_list_lock); | |
608 | dqstats.syncs++; | |
609 | spin_unlock(&dq_list_lock); | |
d3be915f | 610 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
611 | |
612 | return 0; | |
613 | } | |
08d0350c | 614 | EXPORT_SYMBOL(vfs_quota_sync); |
1da177e4 LT |
615 | |
616 | /* Free unused dquots from cache */ | |
617 | static void prune_dqcache(int count) | |
618 | { | |
619 | struct list_head *head; | |
620 | struct dquot *dquot; | |
621 | ||
622 | head = free_dquots.prev; | |
623 | while (head != &free_dquots && count) { | |
624 | dquot = list_entry(head, struct dquot, dq_free); | |
625 | remove_dquot_hash(dquot); | |
626 | remove_free_dquot(dquot); | |
627 | remove_inuse(dquot); | |
74f783af | 628 | do_destroy_dquot(dquot); |
1da177e4 LT |
629 | count--; |
630 | head = free_dquots.prev; | |
631 | } | |
632 | } | |
633 | ||
634 | /* | |
635 | * This is called from kswapd when we think we need some | |
636 | * more memory | |
637 | */ | |
638 | ||
27496a8c | 639 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
640 | { |
641 | if (nr) { | |
642 | spin_lock(&dq_list_lock); | |
643 | prune_dqcache(nr); | |
644 | spin_unlock(&dq_list_lock); | |
645 | } | |
646 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
647 | } | |
648 | ||
8e1f936b RR |
649 | static struct shrinker dqcache_shrinker = { |
650 | .shrink = shrink_dqcache_memory, | |
651 | .seeks = DEFAULT_SEEKS, | |
652 | }; | |
653 | ||
1da177e4 LT |
654 | /* |
655 | * Put reference to dquot | |
656 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 657 | */ |
3d9ea253 | 658 | void dqput(struct dquot *dquot) |
1da177e4 | 659 | { |
b48d3805 JK |
660 | int ret; |
661 | ||
1da177e4 LT |
662 | if (!dquot) |
663 | return; | |
664 | #ifdef __DQUOT_PARANOIA | |
665 | if (!atomic_read(&dquot->dq_count)) { | |
666 | printk("VFS: dqput: trying to free free dquot\n"); | |
667 | printk("VFS: device %s, dquot of %s %d\n", | |
668 | dquot->dq_sb->s_id, | |
669 | quotatypes[dquot->dq_type], | |
670 | dquot->dq_id); | |
671 | BUG(); | |
672 | } | |
673 | #endif | |
674 | ||
675 | spin_lock(&dq_list_lock); | |
676 | dqstats.drops++; | |
677 | spin_unlock(&dq_list_lock); | |
678 | we_slept: | |
679 | spin_lock(&dq_list_lock); | |
680 | if (atomic_read(&dquot->dq_count) > 1) { | |
681 | /* We have more than one user... nothing to do */ | |
682 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 683 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 684 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
685 | atomic_read(&dquot->dq_count) == 1) |
686 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
687 | spin_unlock(&dq_list_lock); |
688 | return; | |
689 | } | |
690 | /* Need to release dquot? */ | |
691 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
692 | spin_unlock(&dq_list_lock); | |
693 | /* Commit dquot before releasing */ | |
b48d3805 JK |
694 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
695 | if (ret < 0) { | |
696 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
697 | "device %s (error %d). Quota may get out of " | |
698 | "sync!\n", dquot->dq_sb->s_id, ret); | |
699 | /* | |
700 | * We clear dirty bit anyway, so that we avoid | |
701 | * infinite loop here | |
702 | */ | |
703 | spin_lock(&dq_list_lock); | |
704 | clear_dquot_dirty(dquot); | |
705 | spin_unlock(&dq_list_lock); | |
706 | } | |
1da177e4 LT |
707 | goto we_slept; |
708 | } | |
709 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
710 | clear_dquot_dirty(dquot); | |
711 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
712 | spin_unlock(&dq_list_lock); | |
713 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
714 | goto we_slept; | |
715 | } | |
716 | atomic_dec(&dquot->dq_count); | |
717 | #ifdef __DQUOT_PARANOIA | |
718 | /* sanity check */ | |
8abf6a47 | 719 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
720 | #endif |
721 | put_dquot_last(dquot); | |
722 | spin_unlock(&dq_list_lock); | |
723 | } | |
08d0350c | 724 | EXPORT_SYMBOL(dqput); |
1da177e4 | 725 | |
7d9056ba | 726 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
727 | { |
728 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
729 | } | |
7d9056ba | 730 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 731 | |
1da177e4 LT |
732 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
733 | { | |
734 | struct dquot *dquot; | |
735 | ||
74f783af | 736 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 737 | if(!dquot) |
dd6f3c6d | 738 | return NULL; |
1da177e4 | 739 | |
d3be915f | 740 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
741 | INIT_LIST_HEAD(&dquot->dq_free); |
742 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
743 | INIT_HLIST_NODE(&dquot->dq_hash); | |
744 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 745 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
746 | dquot->dq_sb = sb; |
747 | dquot->dq_type = type; | |
748 | atomic_set(&dquot->dq_count, 1); | |
749 | ||
750 | return dquot; | |
751 | } | |
752 | ||
753 | /* | |
754 | * Get reference to dquot | |
cc33412f JK |
755 | * |
756 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
757 | * destroying our dquot by: | |
758 | * a) checking for quota flags under dq_list_lock and | |
759 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 760 | */ |
3d9ea253 | 761 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
762 | { |
763 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 764 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 765 | |
f55abc0f | 766 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 767 | return NULL; |
1da177e4 LT |
768 | we_slept: |
769 | spin_lock(&dq_list_lock); | |
cc33412f JK |
770 | spin_lock(&dq_state_lock); |
771 | if (!sb_has_quota_active(sb, type)) { | |
772 | spin_unlock(&dq_state_lock); | |
773 | spin_unlock(&dq_list_lock); | |
774 | goto out; | |
775 | } | |
776 | spin_unlock(&dq_state_lock); | |
777 | ||
dd6f3c6d JK |
778 | dquot = find_dquot(hashent, sb, id, type); |
779 | if (!dquot) { | |
780 | if (!empty) { | |
1da177e4 | 781 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
782 | empty = get_empty_dquot(sb, type); |
783 | if (!empty) | |
1da177e4 LT |
784 | schedule(); /* Try to wait for a moment... */ |
785 | goto we_slept; | |
786 | } | |
787 | dquot = empty; | |
dd6f3c6d | 788 | empty = NULL; |
1da177e4 LT |
789 | dquot->dq_id = id; |
790 | /* all dquots go on the inuse_list */ | |
791 | put_inuse(dquot); | |
792 | /* hash it first so it can be found */ | |
793 | insert_dquot_hash(dquot); | |
794 | dqstats.lookups++; | |
795 | spin_unlock(&dq_list_lock); | |
796 | } else { | |
797 | if (!atomic_read(&dquot->dq_count)) | |
798 | remove_free_dquot(dquot); | |
799 | atomic_inc(&dquot->dq_count); | |
800 | dqstats.cache_hits++; | |
801 | dqstats.lookups++; | |
802 | spin_unlock(&dq_list_lock); | |
1da177e4 | 803 | } |
268157ba JK |
804 | /* Wait for dq_lock - after this we know that either dquot_release() is |
805 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 806 | wait_on_dquot(dquot); |
268157ba JK |
807 | /* Read the dquot / allocate space in quota file */ |
808 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
809 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 810 | dqput(dquot); |
dd6f3c6d | 811 | dquot = NULL; |
cc33412f | 812 | goto out; |
1da177e4 LT |
813 | } |
814 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 815 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 816 | #endif |
cc33412f JK |
817 | out: |
818 | if (empty) | |
819 | do_destroy_dquot(empty); | |
1da177e4 LT |
820 | |
821 | return dquot; | |
822 | } | |
08d0350c | 823 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
824 | |
825 | static int dqinit_needed(struct inode *inode, int type) | |
826 | { | |
827 | int cnt; | |
828 | ||
829 | if (IS_NOQUOTA(inode)) | |
830 | return 0; | |
831 | if (type != -1) | |
dd6f3c6d | 832 | return !inode->i_dquot[type]; |
1da177e4 | 833 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 834 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
835 | return 1; |
836 | return 0; | |
837 | } | |
838 | ||
d3be915f | 839 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
840 | static void add_dquot_ref(struct super_block *sb, int type) |
841 | { | |
941d2380 | 842 | struct inode *inode, *old_inode = NULL; |
1da177e4 | 843 | |
d003fb70 CH |
844 | spin_lock(&inode_lock); |
845 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
b6fac63c | 846 | if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) |
aabb8fdb | 847 | continue; |
d003fb70 CH |
848 | if (!atomic_read(&inode->i_writecount)) |
849 | continue; | |
850 | if (!dqinit_needed(inode, type)) | |
851 | continue; | |
d003fb70 CH |
852 | |
853 | __iget(inode); | |
854 | spin_unlock(&inode_lock); | |
855 | ||
941d2380 | 856 | iput(old_inode); |
d003fb70 | 857 | sb->dq_op->initialize(inode, type); |
941d2380 JK |
858 | /* We hold a reference to 'inode' so it couldn't have been |
859 | * removed from s_inodes list while we dropped the inode_lock. | |
860 | * We cannot iput the inode now as we can be holding the last | |
861 | * reference and we cannot iput it under inode_lock. So we | |
862 | * keep the reference and iput it later. */ | |
863 | old_inode = inode; | |
864 | spin_lock(&inode_lock); | |
1da177e4 | 865 | } |
d003fb70 | 866 | spin_unlock(&inode_lock); |
941d2380 | 867 | iput(old_inode); |
1da177e4 LT |
868 | } |
869 | ||
268157ba JK |
870 | /* |
871 | * Return 0 if dqput() won't block. | |
872 | * (note that 1 doesn't necessarily mean blocking) | |
873 | */ | |
1da177e4 LT |
874 | static inline int dqput_blocks(struct dquot *dquot) |
875 | { | |
876 | if (atomic_read(&dquot->dq_count) <= 1) | |
877 | return 1; | |
878 | return 0; | |
879 | } | |
880 | ||
268157ba JK |
881 | /* |
882 | * Remove references to dquots from inode and add dquot to list for freeing | |
883 | * if we have the last referece to dquot | |
884 | * We can't race with anybody because we hold dqptr_sem for writing... | |
885 | */ | |
e5f00f42 AB |
886 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
887 | struct list_head *tofree_head) | |
1da177e4 LT |
888 | { |
889 | struct dquot *dquot = inode->i_dquot[type]; | |
890 | ||
dd6f3c6d JK |
891 | inode->i_dquot[type] = NULL; |
892 | if (dquot) { | |
1da177e4 LT |
893 | if (dqput_blocks(dquot)) { |
894 | #ifdef __DQUOT_PARANOIA | |
895 | if (atomic_read(&dquot->dq_count) != 1) | |
896 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
897 | #endif | |
898 | spin_lock(&dq_list_lock); | |
268157ba JK |
899 | /* As dquot must have currently users it can't be on |
900 | * the free list... */ | |
901 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
902 | spin_unlock(&dq_list_lock); |
903 | return 1; | |
904 | } | |
905 | else | |
906 | dqput(dquot); /* We have guaranteed we won't block */ | |
907 | } | |
908 | return 0; | |
909 | } | |
910 | ||
268157ba JK |
911 | /* |
912 | * Free list of dquots | |
913 | * Dquots are removed from inodes and no new references can be got so we are | |
914 | * the only ones holding reference | |
915 | */ | |
1da177e4 LT |
916 | static void put_dquot_list(struct list_head *tofree_head) |
917 | { | |
918 | struct list_head *act_head; | |
919 | struct dquot *dquot; | |
920 | ||
921 | act_head = tofree_head->next; | |
1da177e4 LT |
922 | while (act_head != tofree_head) { |
923 | dquot = list_entry(act_head, struct dquot, dq_free); | |
924 | act_head = act_head->next; | |
268157ba JK |
925 | /* Remove dquot from the list so we won't have problems... */ |
926 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
927 | dqput(dquot); |
928 | } | |
929 | } | |
930 | ||
fb58b731 CH |
931 | static void remove_dquot_ref(struct super_block *sb, int type, |
932 | struct list_head *tofree_head) | |
933 | { | |
934 | struct inode *inode; | |
935 | ||
936 | spin_lock(&inode_lock); | |
937 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
aabb8fdb NP |
938 | /* |
939 | * We have to scan also I_NEW inodes because they can already | |
940 | * have quota pointer initialized. Luckily, we need to touch | |
941 | * only quota pointers and these have separate locking | |
942 | * (dqptr_sem). | |
943 | */ | |
fb58b731 CH |
944 | if (!IS_NOQUOTA(inode)) |
945 | remove_inode_dquot_ref(inode, type, tofree_head); | |
946 | } | |
947 | spin_unlock(&inode_lock); | |
948 | } | |
949 | ||
1da177e4 LT |
950 | /* Gather all references from inodes and drop them */ |
951 | static void drop_dquot_ref(struct super_block *sb, int type) | |
952 | { | |
953 | LIST_HEAD(tofree_head); | |
954 | ||
fb58b731 CH |
955 | if (sb->dq_op) { |
956 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
957 | remove_dquot_ref(sb, type, &tofree_head); | |
958 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
959 | put_dquot_list(&tofree_head); | |
960 | } | |
1da177e4 LT |
961 | } |
962 | ||
12095460 | 963 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
964 | { |
965 | dquot->dq_dqb.dqb_curinodes += number; | |
966 | } | |
967 | ||
968 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
969 | { | |
970 | dquot->dq_dqb.dqb_curspace += number; | |
971 | } | |
972 | ||
f18df228 MC |
973 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
974 | { | |
975 | dquot->dq_dqb.dqb_rsvspace += number; | |
976 | } | |
977 | ||
740d9dcd MC |
978 | /* |
979 | * Claim reserved quota space | |
980 | */ | |
981 | static void dquot_claim_reserved_space(struct dquot *dquot, | |
982 | qsize_t number) | |
983 | { | |
984 | WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); | |
985 | dquot->dq_dqb.dqb_curspace += number; | |
986 | dquot->dq_dqb.dqb_rsvspace -= number; | |
987 | } | |
988 | ||
989 | static inline | |
990 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
991 | { | |
992 | dquot->dq_dqb.dqb_rsvspace -= number; | |
993 | } | |
994 | ||
7a2435d8 | 995 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 996 | { |
db49d2df JK |
997 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
998 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
999 | dquot->dq_dqb.dqb_curinodes -= number; |
1000 | else | |
1001 | dquot->dq_dqb.dqb_curinodes = 0; | |
1002 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1003 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1004 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1005 | } | |
1006 | ||
7a2435d8 | 1007 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1008 | { |
db49d2df JK |
1009 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1010 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1011 | dquot->dq_dqb.dqb_curspace -= number; |
1012 | else | |
1013 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1014 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1015 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1016 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1017 | } | |
1018 | ||
c525460e JK |
1019 | static int warning_issued(struct dquot *dquot, const int warntype) |
1020 | { | |
1021 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1022 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1023 | ((warntype == QUOTA_NL_IHARDWARN || | |
1024 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1025 | ||
1026 | if (!flag) | |
1027 | return 0; | |
1028 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1029 | } | |
1030 | ||
8e893469 | 1031 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1032 | static int flag_print_warnings = 1; |
1033 | ||
7a2435d8 | 1034 | static int need_print_warning(struct dquot *dquot) |
1da177e4 LT |
1035 | { |
1036 | if (!flag_print_warnings) | |
1037 | return 0; | |
1038 | ||
1039 | switch (dquot->dq_type) { | |
1040 | case USRQUOTA: | |
da9592ed | 1041 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
1042 | case GRPQUOTA: |
1043 | return in_group_p(dquot->dq_id); | |
1044 | } | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1da177e4 | 1048 | /* Print warning to user which exceeded quota */ |
c525460e | 1049 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
1050 | { |
1051 | char *msg = NULL; | |
24ec839c | 1052 | struct tty_struct *tty; |
1da177e4 | 1053 | |
657d3bfa JK |
1054 | if (warntype == QUOTA_NL_IHARDBELOW || |
1055 | warntype == QUOTA_NL_ISOFTBELOW || | |
1056 | warntype == QUOTA_NL_BHARDBELOW || | |
1057 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1058 | return; |
1059 | ||
24ec839c PZ |
1060 | tty = get_current_tty(); |
1061 | if (!tty) | |
452a00d2 | 1062 | return; |
24ec839c | 1063 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1064 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1065 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1066 | else |
24ec839c PZ |
1067 | tty_write_message(tty, ": write failed, "); |
1068 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1069 | switch (warntype) { |
8e893469 | 1070 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1071 | msg = " file limit reached.\r\n"; |
1072 | break; | |
8e893469 | 1073 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1074 | msg = " file quota exceeded too long.\r\n"; |
1075 | break; | |
8e893469 | 1076 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1077 | msg = " file quota exceeded.\r\n"; |
1078 | break; | |
8e893469 | 1079 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1080 | msg = " block limit reached.\r\n"; |
1081 | break; | |
8e893469 | 1082 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1083 | msg = " block quota exceeded too long.\r\n"; |
1084 | break; | |
8e893469 | 1085 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1086 | msg = " block quota exceeded.\r\n"; |
1087 | break; | |
1088 | } | |
24ec839c | 1089 | tty_write_message(tty, msg); |
452a00d2 | 1090 | tty_kref_put(tty); |
1da177e4 | 1091 | } |
8e893469 JK |
1092 | #endif |
1093 | ||
f18df228 MC |
1094 | /* |
1095 | * Write warnings to the console and send warning messages over netlink. | |
1096 | * | |
1097 | * Note that this function can sleep. | |
1098 | */ | |
7a2435d8 | 1099 | static void flush_warnings(struct dquot *const *dquots, char *warntype) |
1da177e4 | 1100 | { |
86e931a3 | 1101 | struct dquot *dq; |
1da177e4 LT |
1102 | int i; |
1103 | ||
86e931a3 SW |
1104 | for (i = 0; i < MAXQUOTAS; i++) { |
1105 | dq = dquots[i]; | |
1106 | if (dq && warntype[i] != QUOTA_NL_NOWARN && | |
1107 | !warning_issued(dq, warntype[i])) { | |
8e893469 | 1108 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
86e931a3 | 1109 | print_warning(dq, warntype[i]); |
8e893469 | 1110 | #endif |
86e931a3 SW |
1111 | quota_send_warning(dq->dq_type, dq->dq_id, |
1112 | dq->dq_sb->s_dev, warntype[i]); | |
8e893469 | 1113 | } |
86e931a3 | 1114 | } |
1da177e4 LT |
1115 | } |
1116 | ||
7a2435d8 | 1117 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 LT |
1118 | { |
1119 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1120 | ||
1121 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1122 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1123 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | /* needs dq_data_lock */ | |
12095460 | 1127 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1128 | { |
268157ba JK |
1129 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1130 | ||
8e893469 | 1131 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1132 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1133 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1134 | return QUOTA_OK; |
1135 | ||
1136 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1137 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1138 | !ignore_hardlimit(dquot)) { |
8e893469 | 1139 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1140 | return NO_QUOTA; |
1141 | } | |
1142 | ||
1143 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1144 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1145 | dquot->dq_dqb.dqb_itime && | |
1146 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1147 | !ignore_hardlimit(dquot)) { |
8e893469 | 1148 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1149 | return NO_QUOTA; |
1150 | } | |
1151 | ||
1152 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1153 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1154 | dquot->dq_dqb.dqb_itime == 0) { |
8e893469 | 1155 | *warntype = QUOTA_NL_ISOFTWARN; |
268157ba JK |
1156 | dquot->dq_dqb.dqb_itime = get_seconds() + |
1157 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; | |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | return QUOTA_OK; | |
1161 | } | |
1162 | ||
1163 | /* needs dq_data_lock */ | |
1164 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1165 | { | |
f18df228 | 1166 | qsize_t tspace; |
268157ba | 1167 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1168 | |
8e893469 | 1169 | *warntype = QUOTA_NL_NOWARN; |
268157ba | 1170 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || |
f55abc0f | 1171 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
1da177e4 LT |
1172 | return QUOTA_OK; |
1173 | ||
f18df228 MC |
1174 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1175 | + space; | |
1176 | ||
1da177e4 | 1177 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1178 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1179 | !ignore_hardlimit(dquot)) { |
1180 | if (!prealloc) | |
8e893469 | 1181 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1182 | return NO_QUOTA; |
1183 | } | |
1184 | ||
1185 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1186 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1187 | dquot->dq_dqb.dqb_btime && |
1188 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1189 | !ignore_hardlimit(dquot)) { |
1190 | if (!prealloc) | |
8e893469 | 1191 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1192 | return NO_QUOTA; |
1193 | } | |
1194 | ||
1195 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1196 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1197 | dquot->dq_dqb.dqb_btime == 0) { |
1198 | if (!prealloc) { | |
8e893469 | 1199 | *warntype = QUOTA_NL_BSOFTWARN; |
268157ba JK |
1200 | dquot->dq_dqb.dqb_btime = get_seconds() + |
1201 | sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; | |
1da177e4 LT |
1202 | } |
1203 | else | |
1204 | /* | |
1205 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1206 | * be always printed | |
1207 | */ | |
1208 | return NO_QUOTA; | |
1209 | } | |
1210 | ||
1211 | return QUOTA_OK; | |
1212 | } | |
1213 | ||
12095460 | 1214 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1215 | { |
268157ba JK |
1216 | qsize_t newinodes; |
1217 | ||
657d3bfa | 1218 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f JK |
1219 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1220 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1221 | return QUOTA_NL_NOWARN; |
1222 | ||
268157ba JK |
1223 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1224 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1225 | return QUOTA_NL_ISOFTBELOW; |
1226 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1227 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1228 | return QUOTA_NL_IHARDBELOW; |
1229 | return QUOTA_NL_NOWARN; | |
1230 | } | |
1231 | ||
1232 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1233 | { | |
1234 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1235 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1236 | return QUOTA_NL_NOWARN; |
1237 | ||
12095460 | 1238 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1239 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1240 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1241 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1242 | return QUOTA_NL_BHARDBELOW; |
1243 | return QUOTA_NL_NOWARN; | |
1244 | } | |
1da177e4 LT |
1245 | /* |
1246 | * Initialize quota pointers in inode | |
cc33412f JK |
1247 | * We do things in a bit complicated way but by that we avoid calling |
1248 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1da177e4 LT |
1249 | */ |
1250 | int dquot_initialize(struct inode *inode, int type) | |
1251 | { | |
1252 | unsigned int id = 0; | |
1253 | int cnt, ret = 0; | |
dd6f3c6d | 1254 | struct dquot *got[MAXQUOTAS] = { NULL, NULL }; |
cc33412f | 1255 | struct super_block *sb = inode->i_sb; |
1da177e4 | 1256 | |
d3be915f IM |
1257 | /* First test before acquiring mutex - solves deadlocks when we |
1258 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1259 | if (IS_NOQUOTA(inode)) |
1260 | return 0; | |
cc33412f JK |
1261 | |
1262 | /* First get references to structures we might need. */ | |
1263 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1264 | if (type != -1 && cnt != type) | |
1265 | continue; | |
1266 | switch (cnt) { | |
1267 | case USRQUOTA: | |
1268 | id = inode->i_uid; | |
1269 | break; | |
1270 | case GRPQUOTA: | |
1271 | id = inode->i_gid; | |
1272 | break; | |
1273 | } | |
1274 | got[cnt] = dqget(sb, id, cnt); | |
1275 | } | |
1276 | ||
1277 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1278 | /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ |
1279 | if (IS_NOQUOTA(inode)) | |
1280 | goto out_err; | |
1281 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1282 | if (type != -1 && cnt != type) | |
1283 | continue; | |
cc33412f JK |
1284 | /* Avoid races with quotaoff() */ |
1285 | if (!sb_has_quota_active(sb, cnt)) | |
1286 | continue; | |
dd6f3c6d | 1287 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1288 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1289 | got[cnt] = NULL; |
1da177e4 LT |
1290 | } |
1291 | } | |
1292 | out_err: | |
cc33412f JK |
1293 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1294 | /* Drop unused references */ | |
dc52dd3a | 1295 | dqput_all(got); |
1da177e4 LT |
1296 | return ret; |
1297 | } | |
08d0350c | 1298 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1299 | |
1300 | /* | |
1301 | * Release all quotas referenced by inode | |
1da177e4 | 1302 | */ |
cc33412f | 1303 | int dquot_drop(struct inode *inode) |
1da177e4 LT |
1304 | { |
1305 | int cnt; | |
cc33412f | 1306 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1307 | |
cc33412f | 1308 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1309 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1310 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1311 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1312 | } |
1313 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1314 | dqput_all(put); |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
08d0350c | 1317 | EXPORT_SYMBOL(dquot_drop); |
1da177e4 | 1318 | |
b85f4b87 JK |
1319 | /* Wrapper to remove references to quota structures from inode */ |
1320 | void vfs_dq_drop(struct inode *inode) | |
1321 | { | |
1322 | /* Here we can get arbitrary inode from clear_inode() so we have | |
1323 | * to be careful. OTOH we don't need locking as quota operations | |
1324 | * are allowed to change only at mount time */ | |
1325 | if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op | |
1326 | && inode->i_sb->dq_op->drop) { | |
1327 | int cnt; | |
1328 | /* Test before calling to rule out calls from proc and such | |
1329 | * where we are not allowed to block. Note that this is | |
1330 | * actually reliable test even without the lock - the caller | |
1331 | * must assure that nobody can come after the DQUOT_DROP and | |
1332 | * add quota pointers back anyway */ | |
1333 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1334 | if (inode->i_dquot[cnt]) |
b85f4b87 JK |
1335 | break; |
1336 | if (cnt < MAXQUOTAS) | |
1337 | inode->i_sb->dq_op->drop(inode); | |
1338 | } | |
1339 | } | |
08d0350c | 1340 | EXPORT_SYMBOL(vfs_dq_drop); |
b85f4b87 | 1341 | |
fd8fbfc1 DM |
1342 | /* |
1343 | * inode_reserved_space is managed internally by quota, and protected by | |
1344 | * i_lock similar to i_blocks+i_bytes. | |
1345 | */ | |
1346 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1347 | { | |
1348 | /* Filesystem must explicitly define it's own method in order to use | |
1349 | * quota reservation interface */ | |
1350 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1351 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1352 | } | |
1353 | ||
1354 | static void inode_add_rsv_space(struct inode *inode, qsize_t number) | |
1355 | { | |
1356 | spin_lock(&inode->i_lock); | |
1357 | *inode_reserved_space(inode) += number; | |
1358 | spin_unlock(&inode->i_lock); | |
1359 | } | |
1360 | ||
1361 | ||
1362 | static void inode_claim_rsv_space(struct inode *inode, qsize_t number) | |
1363 | { | |
1364 | spin_lock(&inode->i_lock); | |
1365 | *inode_reserved_space(inode) -= number; | |
1366 | __inode_add_bytes(inode, number); | |
1367 | spin_unlock(&inode->i_lock); | |
1368 | } | |
1369 | ||
1370 | static void inode_sub_rsv_space(struct inode *inode, qsize_t number) | |
1371 | { | |
1372 | spin_lock(&inode->i_lock); | |
1373 | *inode_reserved_space(inode) -= number; | |
1374 | spin_unlock(&inode->i_lock); | |
1375 | } | |
1376 | ||
1377 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1378 | { | |
1379 | qsize_t ret; | |
1380 | spin_lock(&inode->i_lock); | |
1381 | ret = *inode_reserved_space(inode); | |
1382 | spin_unlock(&inode->i_lock); | |
1383 | return ret; | |
1384 | } | |
1385 | ||
1386 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1387 | int reserve) | |
1388 | { | |
1389 | if (reserve) | |
1390 | inode_add_rsv_space(inode, number); | |
1391 | else | |
1392 | inode_add_bytes(inode, number); | |
1393 | } | |
1394 | ||
1395 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1396 | { | |
1397 | if (reserve) | |
1398 | inode_sub_rsv_space(inode, number); | |
1399 | else | |
1400 | inode_sub_bytes(inode, number); | |
1401 | } | |
1402 | ||
1da177e4 LT |
1403 | /* |
1404 | * Following four functions update i_blocks+i_bytes fields and | |
1405 | * quota information (together with appropriate checks) | |
1406 | * NOTE: We absolutely rely on the fact that caller dirties | |
1407 | * the inode (usually macros in quotaops.h care about this) and | |
1408 | * holds a handle for the current transaction so that dquot write and | |
1409 | * inode write go into the same transaction. | |
1410 | */ | |
1411 | ||
1412 | /* | |
1413 | * This operation can block, but only after everything is updated | |
1414 | */ | |
f18df228 MC |
1415 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
1416 | int warn, int reserve) | |
1da177e4 | 1417 | { |
f18df228 | 1418 | int cnt, ret = QUOTA_OK; |
1da177e4 LT |
1419 | char warntype[MAXQUOTAS]; |
1420 | ||
fd8fbfc1 DM |
1421 | /* |
1422 | * First test before acquiring mutex - solves deadlocks when we | |
1423 | * re-enter the quota code and are already holding the mutex | |
1424 | */ | |
1425 | if (IS_NOQUOTA(inode)) { | |
1426 | inode_incr_space(inode, number, reserve); | |
1427 | goto out; | |
1428 | } | |
1429 | ||
1430 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1431 | if (IS_NOQUOTA(inode)) { | |
1432 | inode_incr_space(inode, number, reserve); | |
1433 | goto out_unlock; | |
1434 | } | |
1435 | ||
1da177e4 | 1436 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1437 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1438 | |
1da177e4 LT |
1439 | spin_lock(&dq_data_lock); |
1440 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1441 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1442 | continue; |
f18df228 MC |
1443 | if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) |
1444 | == NO_QUOTA) { | |
1445 | ret = NO_QUOTA; | |
fd8fbfc1 DM |
1446 | spin_unlock(&dq_data_lock); |
1447 | goto out_flush_warn; | |
f18df228 | 1448 | } |
1da177e4 LT |
1449 | } |
1450 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1451 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1452 | continue; |
f18df228 MC |
1453 | if (reserve) |
1454 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1455 | else | |
1456 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1457 | } |
fd8fbfc1 | 1458 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1459 | spin_unlock(&dq_data_lock); |
f18df228 | 1460 | |
fd8fbfc1 DM |
1461 | if (reserve) |
1462 | goto out_flush_warn; | |
dc52dd3a | 1463 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 DM |
1464 | out_flush_warn: |
1465 | flush_warnings(inode->i_dquot, warntype); | |
f18df228 | 1466 | out_unlock: |
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 LT |
1498 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1499 | if (IS_NOQUOTA(inode)) { | |
1500 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1501 | return QUOTA_OK; | |
1502 | } | |
1503 | spin_lock(&dq_data_lock); | |
1504 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1505 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1506 | continue; |
268157ba JK |
1507 | if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) |
1508 | == NO_QUOTA) | |
1da177e4 LT |
1509 | goto warn_put_all; |
1510 | } | |
1511 | ||
1512 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1513 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
1514 | continue; |
1515 | dquot_incr_inodes(inode->i_dquot[cnt], number); | |
1516 | } | |
1517 | ret = QUOTA_OK; | |
1518 | warn_put_all: | |
1519 | spin_unlock(&dq_data_lock); | |
1520 | if (ret == QUOTA_OK) | |
dc52dd3a | 1521 | mark_all_dquot_dirty(inode->i_dquot); |
087ee8d5 | 1522 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1523 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1524 | return ret; | |
1525 | } | |
08d0350c | 1526 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1527 | |
740d9dcd MC |
1528 | int dquot_claim_space(struct inode *inode, qsize_t number) |
1529 | { | |
1530 | int cnt; | |
1531 | int ret = QUOTA_OK; | |
1532 | ||
1533 | if (IS_NOQUOTA(inode)) { | |
fd8fbfc1 | 1534 | inode_claim_rsv_space(inode, number); |
740d9dcd MC |
1535 | goto out; |
1536 | } | |
1537 | ||
1538 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1539 | if (IS_NOQUOTA(inode)) { | |
1540 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
fd8fbfc1 | 1541 | inode_claim_rsv_space(inode, number); |
740d9dcd MC |
1542 | goto out; |
1543 | } | |
1544 | ||
1545 | spin_lock(&dq_data_lock); | |
1546 | /* Claim reserved quotas to allocated quotas */ | |
1547 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1548 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1549 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1550 | number); | |
1551 | } | |
1552 | /* Update inode bytes */ | |
fd8fbfc1 | 1553 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1554 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1555 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd MC |
1556 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1557 | out: | |
1558 | return ret; | |
1559 | } | |
1560 | EXPORT_SYMBOL(dquot_claim_space); | |
1561 | ||
1da177e4 LT |
1562 | /* |
1563 | * This operation can block, but only after everything is updated | |
1564 | */ | |
fd8fbfc1 | 1565 | int __dquot_free_space(struct inode *inode, qsize_t number, int reserve) |
1da177e4 LT |
1566 | { |
1567 | unsigned int cnt; | |
657d3bfa | 1568 | char warntype[MAXQUOTAS]; |
1da177e4 | 1569 | |
d3be915f IM |
1570 | /* First test before acquiring mutex - solves deadlocks when we |
1571 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1572 | if (IS_NOQUOTA(inode)) { |
1573 | out_sub: | |
fd8fbfc1 | 1574 | inode_decr_space(inode, number, reserve); |
1da177e4 LT |
1575 | return QUOTA_OK; |
1576 | } | |
657d3bfa | 1577 | |
1da177e4 LT |
1578 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1579 | /* Now recheck reliably when holding dqptr_sem */ | |
1580 | if (IS_NOQUOTA(inode)) { | |
1581 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1582 | goto out_sub; | |
1583 | } | |
1584 | spin_lock(&dq_data_lock); | |
1585 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1586 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1587 | continue; |
657d3bfa | 1588 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
fd8fbfc1 DM |
1589 | if (reserve) |
1590 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1591 | else | |
1592 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1593 | } |
fd8fbfc1 | 1594 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1595 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1596 | |
1597 | if (reserve) | |
1598 | goto out_unlock; | |
dc52dd3a | 1599 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 | 1600 | out_unlock: |
657d3bfa | 1601 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1602 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1603 | return QUOTA_OK; | |
1604 | } | |
fd8fbfc1 DM |
1605 | |
1606 | int dquot_free_space(struct inode *inode, qsize_t number) | |
1607 | { | |
1608 | return __dquot_free_space(inode, number, 0); | |
1609 | } | |
08d0350c | 1610 | EXPORT_SYMBOL(dquot_free_space); |
1da177e4 | 1611 | |
fd8fbfc1 DM |
1612 | /* |
1613 | * Release reserved quota space | |
1614 | */ | |
1615 | void dquot_release_reserved_space(struct inode *inode, qsize_t number) | |
1616 | { | |
1617 | __dquot_free_space(inode, number, 1); | |
1618 | ||
1619 | } | |
1620 | EXPORT_SYMBOL(dquot_release_reserved_space); | |
1621 | ||
1da177e4 LT |
1622 | /* |
1623 | * This operation can block, but only after everything is updated | |
1624 | */ | |
12095460 | 1625 | int dquot_free_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1626 | { |
1627 | unsigned int cnt; | |
657d3bfa | 1628 | char warntype[MAXQUOTAS]; |
1da177e4 | 1629 | |
d3be915f IM |
1630 | /* First test before acquiring mutex - solves deadlocks when we |
1631 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1632 | if (IS_NOQUOTA(inode)) |
1633 | return QUOTA_OK; | |
657d3bfa | 1634 | |
1da177e4 LT |
1635 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1636 | /* Now recheck reliably when holding dqptr_sem */ | |
1637 | if (IS_NOQUOTA(inode)) { | |
1638 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1639 | return QUOTA_OK; | |
1640 | } | |
1641 | spin_lock(&dq_data_lock); | |
1642 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1643 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1644 | continue; |
657d3bfa | 1645 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1646 | dquot_decr_inodes(inode->i_dquot[cnt], number); |
1647 | } | |
1648 | spin_unlock(&dq_data_lock); | |
dc52dd3a | 1649 | mark_all_dquot_dirty(inode->i_dquot); |
657d3bfa | 1650 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1651 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1652 | return QUOTA_OK; | |
1653 | } | |
08d0350c | 1654 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1655 | |
1656 | /* | |
1657 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1658 | * | |
1659 | * This operation can block, but only after everything is updated | |
1660 | * A transaction must be started when entering this function. | |
1661 | */ | |
1662 | int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
1663 | { | |
740d9dcd MC |
1664 | qsize_t space, cur_space; |
1665 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1666 | struct dquot *transfer_from[MAXQUOTAS]; |
1667 | struct dquot *transfer_to[MAXQUOTAS]; | |
cc33412f JK |
1668 | int cnt, ret = QUOTA_OK; |
1669 | int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, | |
1670 | chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; | |
657d3bfa JK |
1671 | char warntype_to[MAXQUOTAS]; |
1672 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1673 | |
d3be915f IM |
1674 | /* First test before acquiring mutex - solves deadlocks when we |
1675 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1676 | if (IS_NOQUOTA(inode)) |
1677 | return QUOTA_OK; | |
cc33412f | 1678 | /* Initialize the arrays */ |
1da177e4 | 1679 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
dd6f3c6d JK |
1680 | transfer_from[cnt] = NULL; |
1681 | transfer_to[cnt] = NULL; | |
657d3bfa | 1682 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1683 | } |
268157ba JK |
1684 | if (chuid) |
1685 | transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid, | |
1686 | USRQUOTA); | |
1687 | if (chgid) | |
1688 | transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid, | |
1689 | GRPQUOTA); | |
cc33412f JK |
1690 | |
1691 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1692 | /* Now recheck reliably when holding dqptr_sem */ | |
1693 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ | |
1694 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1695 | goto put_all; | |
1696 | } | |
1da177e4 | 1697 | spin_lock(&dq_data_lock); |
740d9dcd | 1698 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1699 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1700 | space = cur_space + rsv_space; |
1da177e4 LT |
1701 | /* Build the transfer_from list and check the limits */ |
1702 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1703 | if (!transfer_to[cnt]) |
1da177e4 LT |
1704 | continue; |
1705 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
657d3bfa JK |
1706 | if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == |
1707 | NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, | |
1708 | warntype_to + cnt) == NO_QUOTA) | |
cc33412f | 1709 | goto over_quota; |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | /* | |
1713 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1714 | */ | |
1715 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1716 | /* | |
1717 | * Skip changes for same uid or gid or for turned off quota-type. | |
1718 | */ | |
dd6f3c6d | 1719 | if (!transfer_to[cnt]) |
1da177e4 LT |
1720 | continue; |
1721 | ||
1722 | /* Due to IO error we might not have transfer_from[] structure */ | |
1723 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1724 | warntype_from_inodes[cnt] = |
1725 | info_idq_free(transfer_from[cnt], 1); | |
1726 | warntype_from_space[cnt] = | |
1727 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1728 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1729 | dquot_decr_space(transfer_from[cnt], cur_space); |
1730 | dquot_free_reserved_space(transfer_from[cnt], | |
1731 | rsv_space); | |
1da177e4 LT |
1732 | } |
1733 | ||
1734 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1735 | dquot_incr_space(transfer_to[cnt], cur_space); |
1736 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1737 | |
1738 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1739 | } | |
1da177e4 | 1740 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1741 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1742 | ||
dc52dd3a DM |
1743 | mark_all_dquot_dirty(transfer_from); |
1744 | mark_all_dquot_dirty(transfer_to); | |
1745 | /* The reference we got is transferred to the inode */ | |
1746 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1747 | transfer_to[cnt] = NULL; | |
cc33412f | 1748 | warn_put_all: |
657d3bfa JK |
1749 | flush_warnings(transfer_to, warntype_to); |
1750 | flush_warnings(transfer_from, warntype_from_inodes); | |
1751 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1752 | put_all: |
dc52dd3a DM |
1753 | dqput_all(transfer_from); |
1754 | dqput_all(transfer_to); | |
1da177e4 | 1755 | return ret; |
cc33412f JK |
1756 | over_quota: |
1757 | spin_unlock(&dq_data_lock); | |
1758 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1759 | /* Clear dquot pointers we don't want to dqput() */ | |
1760 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1761 | transfer_from[cnt] = NULL; |
cc33412f JK |
1762 | ret = NO_QUOTA; |
1763 | goto warn_put_all; | |
1da177e4 | 1764 | } |
08d0350c | 1765 | EXPORT_SYMBOL(dquot_transfer); |
1da177e4 | 1766 | |
b85f4b87 JK |
1767 | /* Wrapper for transferring ownership of an inode */ |
1768 | int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) | |
1769 | { | |
f55abc0f | 1770 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
b85f4b87 JK |
1771 | vfs_dq_init(inode); |
1772 | if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) | |
1773 | return 1; | |
1774 | } | |
1775 | return 0; | |
1776 | } | |
08d0350c | 1777 | EXPORT_SYMBOL(vfs_dq_transfer); |
b85f4b87 | 1778 | |
1da177e4 LT |
1779 | /* |
1780 | * Write info of quota file to disk | |
1781 | */ | |
1782 | int dquot_commit_info(struct super_block *sb, int type) | |
1783 | { | |
1784 | int ret; | |
1785 | struct quota_info *dqopt = sb_dqopt(sb); | |
1786 | ||
d3be915f | 1787 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1788 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1789 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1790 | return ret; |
1791 | } | |
08d0350c | 1792 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1793 | |
1794 | /* | |
1795 | * Definitions of diskquota operations. | |
1796 | */ | |
61e225dc | 1797 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1798 | .initialize = dquot_initialize, |
1799 | .drop = dquot_drop, | |
1800 | .alloc_space = dquot_alloc_space, | |
1801 | .alloc_inode = dquot_alloc_inode, | |
1802 | .free_space = dquot_free_space, | |
1803 | .free_inode = dquot_free_inode, | |
1804 | .transfer = dquot_transfer, | |
1805 | .write_dquot = dquot_commit, | |
1806 | .acquire_dquot = dquot_acquire, | |
1807 | .release_dquot = dquot_release, | |
1808 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1809 | .write_info = dquot_commit_info, |
1810 | .alloc_dquot = dquot_alloc, | |
1811 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1812 | }; |
1813 | ||
1da177e4 LT |
1814 | /* |
1815 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1816 | */ | |
f55abc0f | 1817 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1818 | { |
0ff5af83 | 1819 | int cnt, ret = 0; |
1da177e4 LT |
1820 | struct quota_info *dqopt = sb_dqopt(sb); |
1821 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1822 | |
f55abc0f JK |
1823 | /* Cannot turn off usage accounting without turning off limits, or |
1824 | * suspend quotas and simultaneously turn quotas off. */ | |
1825 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1826 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1827 | DQUOT_USAGE_ENABLED))) | |
1828 | return -EINVAL; | |
1829 | ||
1da177e4 | 1830 | /* We need to serialize quota_off() for device */ |
d3be915f | 1831 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1832 | |
1833 | /* | |
1834 | * Skip everything if there's nothing to do. We have to do this because | |
1835 | * sometimes we are called when fill_super() failed and calling | |
1836 | * sync_fs() in such cases does no good. | |
1837 | */ | |
f55abc0f | 1838 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1839 | mutex_unlock(&dqopt->dqonoff_mutex); |
1840 | return 0; | |
1841 | } | |
1da177e4 LT |
1842 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1843 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1844 | if (type != -1 && cnt != type) |
1845 | continue; | |
f55abc0f | 1846 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1847 | continue; |
f55abc0f JK |
1848 | |
1849 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1850 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1851 | dqopt->flags |= |
1852 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1853 | spin_unlock(&dq_state_lock); |
f55abc0f | 1854 | } else { |
cc33412f | 1855 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1856 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1857 | /* Turning off suspended quotas? */ | |
1858 | if (!sb_has_quota_loaded(sb, cnt) && | |
1859 | sb_has_quota_suspended(sb, cnt)) { | |
1860 | dqopt->flags &= ~dquot_state_flag( | |
1861 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1862 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1863 | iput(dqopt->files[cnt]); |
1864 | dqopt->files[cnt] = NULL; | |
1865 | continue; | |
1866 | } | |
cc33412f | 1867 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1868 | } |
f55abc0f JK |
1869 | |
1870 | /* We still have to keep quota loaded? */ | |
1871 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1872 | continue; |
1da177e4 LT |
1873 | |
1874 | /* Note: these are blocking operations */ | |
1875 | drop_dquot_ref(sb, cnt); | |
1876 | invalidate_dquots(sb, cnt); | |
1877 | /* | |
268157ba JK |
1878 | * Now all dquots should be invalidated, all writes done so we |
1879 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
1880 | */ |
1881 | if (info_dirty(&dqopt->info[cnt])) | |
1882 | sb->dq_op->write_info(sb, cnt); | |
1883 | if (dqopt->ops[cnt]->free_file_info) | |
1884 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1885 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1886 | ||
1887 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1888 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1889 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1890 | dqopt->info[cnt].dqi_flags = 0; |
1891 | dqopt->info[cnt].dqi_igrace = 0; | |
1892 | dqopt->info[cnt].dqi_bgrace = 0; | |
1893 | dqopt->ops[cnt] = NULL; | |
1894 | } | |
d3be915f | 1895 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1896 | |
1897 | /* Skip syncing and setting flags if quota files are hidden */ | |
1898 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1899 | goto put_inodes; | |
1900 | ||
1da177e4 | 1901 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1902 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1903 | if (sb->s_op->sync_fs) |
1904 | sb->s_op->sync_fs(sb, 1); | |
1905 | sync_blockdev(sb->s_bdev); | |
1906 | /* Now the quota files are just ordinary files and we can set the | |
1907 | * inode flags back. Moreover we discard the pagecache so that | |
1908 | * userspace sees the writes we did bypassing the pagecache. We | |
1909 | * must also discard the blockdev buffers so that we see the | |
1910 | * changes done by userspace on the next quotaon() */ | |
1911 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1912 | if (toputinode[cnt]) { | |
d3be915f | 1913 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1914 | /* If quota was reenabled in the meantime, we have |
1915 | * nothing to do */ | |
f55abc0f | 1916 | if (!sb_has_quota_loaded(sb, cnt)) { |
268157ba JK |
1917 | mutex_lock_nested(&toputinode[cnt]->i_mutex, |
1918 | I_MUTEX_QUOTA); | |
1da177e4 LT |
1919 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1920 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
1921 | truncate_inode_pages(&toputinode[cnt]->i_data, |
1922 | 0); | |
1b1dcc1b | 1923 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1924 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1925 | } |
d3be915f | 1926 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1927 | } |
1928 | if (sb->s_bdev) | |
1929 | invalidate_bdev(sb->s_bdev); | |
1930 | put_inodes: | |
1931 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1932 | if (toputinode[cnt]) { | |
0ff5af83 | 1933 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1934 | * can reenable quota on the subsequent remount RW. We |
1935 | * have to check 'flags' variable and not use sb_has_ | |
1936 | * function because another quotaon / quotaoff could | |
1937 | * change global state before we got here. We refuse | |
1938 | * to suspend quotas when there is pending delete on | |
1939 | * the quota file... */ | |
1940 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1941 | iput(toputinode[cnt]); |
1942 | else if (!toputinode[cnt]->i_nlink) | |
1943 | ret = -EBUSY; | |
1da177e4 | 1944 | } |
0ff5af83 | 1945 | return ret; |
1da177e4 | 1946 | } |
08d0350c | 1947 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 1948 | |
f55abc0f JK |
1949 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1950 | { | |
1951 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1952 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1953 | } | |
08d0350c | 1954 | EXPORT_SYMBOL(vfs_quota_off); |
1da177e4 LT |
1955 | /* |
1956 | * Turn quotas on on a device | |
1957 | */ | |
1958 | ||
f55abc0f JK |
1959 | /* |
1960 | * Helper function to turn quotas on when we already have the inode of | |
1961 | * quota file and no quota information is loaded. | |
1962 | */ | |
1963 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1964 | unsigned int flags) | |
1da177e4 LT |
1965 | { |
1966 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1967 | struct super_block *sb = inode->i_sb; | |
1968 | struct quota_info *dqopt = sb_dqopt(sb); | |
1969 | int error; | |
1970 | int oldflags = -1; | |
1971 | ||
1972 | if (!fmt) | |
1973 | return -ESRCH; | |
1974 | if (!S_ISREG(inode->i_mode)) { | |
1975 | error = -EACCES; | |
1976 | goto out_fmt; | |
1977 | } | |
1978 | if (IS_RDONLY(inode)) { | |
1979 | error = -EROFS; | |
1980 | goto out_fmt; | |
1981 | } | |
1982 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
1983 | error = -EINVAL; | |
1984 | goto out_fmt; | |
1985 | } | |
f55abc0f JK |
1986 | /* Usage always has to be set... */ |
1987 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
1988 | error = -EINVAL; | |
1989 | goto out_fmt; | |
1990 | } | |
1da177e4 | 1991 | |
ca785ec6 JK |
1992 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
1993 | /* As we bypass the pagecache we must now flush the inode so | |
1994 | * that we see all the changes from userspace... */ | |
1995 | write_inode_now(inode, 1); | |
1996 | /* And now flush the block cache so that kernel sees the | |
1997 | * changes */ | |
1998 | invalidate_bdev(sb->s_bdev); | |
1999 | } | |
d3be915f | 2000 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2001 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2002 | error = -EBUSY; |
2003 | goto out_lock; | |
2004 | } | |
ca785ec6 JK |
2005 | |
2006 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2007 | /* We don't want quota and atime on quota files (deadlocks | |
2008 | * possible) Also nobody should write to the file - we use | |
2009 | * special IO operations which ignore the immutable bit. */ | |
2010 | down_write(&dqopt->dqptr_sem); | |
dee86565 | 2011 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
268157ba JK |
2012 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2013 | S_NOQUOTA); | |
ca785ec6 | 2014 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2015 | mutex_unlock(&inode->i_mutex); |
ca785ec6 JK |
2016 | up_write(&dqopt->dqptr_sem); |
2017 | sb->dq_op->drop(inode); | |
2018 | } | |
1da177e4 LT |
2019 | |
2020 | error = -EIO; | |
2021 | dqopt->files[type] = igrab(inode); | |
2022 | if (!dqopt->files[type]) | |
2023 | goto out_lock; | |
2024 | error = -EINVAL; | |
2025 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2026 | goto out_file_init; | |
2027 | ||
2028 | dqopt->ops[type] = fmt->qf_ops; | |
2029 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2030 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2031 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2032 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2033 | error = dqopt->ops[type]->read_file_info(sb, type); |
2034 | if (error < 0) { | |
d3be915f | 2035 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2036 | goto out_file_init; |
2037 | } | |
d3be915f | 2038 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2039 | spin_lock(&dq_state_lock); |
f55abc0f | 2040 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2041 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2042 | |
2043 | add_dquot_ref(sb, type); | |
d3be915f | 2044 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2045 | |
2046 | return 0; | |
2047 | ||
2048 | out_file_init: | |
2049 | dqopt->files[type] = NULL; | |
2050 | iput(inode); | |
2051 | out_lock: | |
1da177e4 LT |
2052 | if (oldflags != -1) { |
2053 | down_write(&dqopt->dqptr_sem); | |
dee86565 | 2054 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2055 | /* Set the flags back (in the case of accidental quotaon() |
2056 | * on a wrong file we don't want to mess up the flags) */ | |
2057 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2058 | inode->i_flags |= oldflags; | |
dee86565 | 2059 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2060 | up_write(&dqopt->dqptr_sem); |
2061 | } | |
d01730d7 | 2062 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2063 | out_fmt: |
2064 | put_quota_format(fmt); | |
2065 | ||
2066 | return error; | |
2067 | } | |
2068 | ||
0ff5af83 JK |
2069 | /* Reenable quotas on remount RW */ |
2070 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2071 | { | |
2072 | struct quota_info *dqopt = sb_dqopt(sb); | |
2073 | struct inode *inode; | |
2074 | int ret; | |
f55abc0f | 2075 | unsigned int flags; |
0ff5af83 JK |
2076 | |
2077 | mutex_lock(&dqopt->dqonoff_mutex); | |
2078 | if (!sb_has_quota_suspended(sb, type)) { | |
2079 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2080 | return 0; | |
2081 | } | |
0ff5af83 JK |
2082 | inode = dqopt->files[type]; |
2083 | dqopt->files[type] = NULL; | |
cc33412f | 2084 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2085 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2086 | DQUOT_LIMITS_ENABLED, type); | |
2087 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2088 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2089 | mutex_unlock(&dqopt->dqonoff_mutex); |
2090 | ||
f55abc0f JK |
2091 | flags = dquot_generic_flag(flags, type); |
2092 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2093 | flags); | |
0ff5af83 JK |
2094 | iput(inode); |
2095 | ||
2096 | return ret; | |
2097 | } | |
2098 | ||
77e69dac AV |
2099 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2100 | struct path *path) | |
2101 | { | |
2102 | int error = security_quota_on(path->dentry); | |
2103 | if (error) | |
2104 | return error; | |
2105 | /* Quota file not on the same filesystem? */ | |
2106 | if (path->mnt->mnt_sb != sb) | |
2107 | error = -EXDEV; | |
2108 | else | |
f55abc0f JK |
2109 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2110 | format_id, DQUOT_USAGE_ENABLED | | |
2111 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2112 | return error; |
2113 | } | |
08d0350c | 2114 | EXPORT_SYMBOL(vfs_quota_on_path); |
77e69dac | 2115 | |
8264613d | 2116 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2117 | int remount) |
1da177e4 | 2118 | { |
8264613d | 2119 | struct path path; |
1da177e4 LT |
2120 | int error; |
2121 | ||
0ff5af83 JK |
2122 | if (remount) |
2123 | return vfs_quota_on_remount(sb, type); | |
2124 | ||
8264613d | 2125 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2126 | if (!error) { |
8264613d AV |
2127 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2128 | path_put(&path); | |
77e69dac | 2129 | } |
1da177e4 LT |
2130 | return error; |
2131 | } | |
08d0350c | 2132 | EXPORT_SYMBOL(vfs_quota_on); |
1da177e4 | 2133 | |
f55abc0f JK |
2134 | /* |
2135 | * More powerful function for turning on quotas allowing setting | |
2136 | * of individual quota flags | |
2137 | */ | |
2138 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2139 | unsigned int flags) | |
2140 | { | |
2141 | int ret = 0; | |
2142 | struct super_block *sb = inode->i_sb; | |
2143 | struct quota_info *dqopt = sb_dqopt(sb); | |
2144 | ||
2145 | /* Just unsuspend quotas? */ | |
2146 | if (flags & DQUOT_SUSPENDED) | |
2147 | return vfs_quota_on_remount(sb, type); | |
2148 | if (!flags) | |
2149 | return 0; | |
2150 | /* Just updating flags needed? */ | |
2151 | if (sb_has_quota_loaded(sb, type)) { | |
2152 | mutex_lock(&dqopt->dqonoff_mutex); | |
2153 | /* Now do a reliable test... */ | |
2154 | if (!sb_has_quota_loaded(sb, type)) { | |
2155 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2156 | goto load_quota; | |
2157 | } | |
2158 | if (flags & DQUOT_USAGE_ENABLED && | |
2159 | sb_has_quota_usage_enabled(sb, type)) { | |
2160 | ret = -EBUSY; | |
2161 | goto out_lock; | |
2162 | } | |
2163 | if (flags & DQUOT_LIMITS_ENABLED && | |
2164 | sb_has_quota_limits_enabled(sb, type)) { | |
2165 | ret = -EBUSY; | |
2166 | goto out_lock; | |
2167 | } | |
cc33412f | 2168 | spin_lock(&dq_state_lock); |
f55abc0f | 2169 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2170 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2171 | out_lock: |
2172 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | load_quota: | |
2177 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2178 | } | |
08d0350c | 2179 | EXPORT_SYMBOL(vfs_quota_enable); |
f55abc0f | 2180 | |
1da177e4 LT |
2181 | /* |
2182 | * This function is used when filesystem needs to initialize quotas | |
2183 | * during mount time. | |
2184 | */ | |
84de856e CH |
2185 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2186 | int format_id, int type) | |
1da177e4 | 2187 | { |
84de856e | 2188 | struct dentry *dentry; |
1da177e4 LT |
2189 | int error; |
2190 | ||
c56818d7 | 2191 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2192 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2193 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2194 | if (IS_ERR(dentry)) |
2195 | return PTR_ERR(dentry); | |
2196 | ||
154f484b JK |
2197 | if (!dentry->d_inode) { |
2198 | error = -ENOENT; | |
2199 | goto out; | |
2200 | } | |
2201 | ||
1da177e4 | 2202 | error = security_quota_on(dentry); |
84de856e | 2203 | if (!error) |
f55abc0f JK |
2204 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2205 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2206 | |
154f484b | 2207 | out: |
84de856e CH |
2208 | dput(dentry); |
2209 | return error; | |
1da177e4 | 2210 | } |
08d0350c | 2211 | EXPORT_SYMBOL(vfs_quota_on_mount); |
1da177e4 | 2212 | |
b85f4b87 JK |
2213 | /* Wrapper to turn on quotas when remounting rw */ |
2214 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2215 | { | |
2216 | int cnt; | |
2217 | int ret = 0, err; | |
2218 | ||
2219 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2220 | return -ENOSYS; | |
2221 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2222 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2223 | if (err < 0 && !ret) | |
2224 | ret = err; | |
2225 | } | |
2226 | return ret; | |
2227 | } | |
08d0350c | 2228 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |
b85f4b87 | 2229 | |
12095460 JK |
2230 | static inline qsize_t qbtos(qsize_t blocks) |
2231 | { | |
2232 | return blocks << QIF_DQBLKSIZE_BITS; | |
2233 | } | |
2234 | ||
2235 | static inline qsize_t stoqb(qsize_t space) | |
2236 | { | |
2237 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2238 | } | |
2239 | ||
1da177e4 LT |
2240 | /* Generic routine for getting common part of quota structure */ |
2241 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2242 | { | |
2243 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2244 | ||
2245 | spin_lock(&dq_data_lock); | |
12095460 JK |
2246 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2247 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
f18df228 | 2248 | di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; |
1da177e4 LT |
2249 | di->dqb_ihardlimit = dm->dqb_ihardlimit; |
2250 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2251 | di->dqb_curinodes = dm->dqb_curinodes; | |
2252 | di->dqb_btime = dm->dqb_btime; | |
2253 | di->dqb_itime = dm->dqb_itime; | |
2254 | di->dqb_valid = QIF_ALL; | |
2255 | spin_unlock(&dq_data_lock); | |
2256 | } | |
2257 | ||
268157ba JK |
2258 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, |
2259 | struct if_dqblk *di) | |
1da177e4 LT |
2260 | { |
2261 | struct dquot *dquot; | |
2262 | ||
cc33412f | 2263 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2264 | if (!dquot) |
1da177e4 | 2265 | return -ESRCH; |
1da177e4 LT |
2266 | do_get_dqblk(dquot, di); |
2267 | dqput(dquot); | |
cc33412f | 2268 | |
1da177e4 LT |
2269 | return 0; |
2270 | } | |
08d0350c | 2271 | EXPORT_SYMBOL(vfs_get_dqblk); |
1da177e4 LT |
2272 | |
2273 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2274 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2275 | { |
2276 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2277 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2278 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2279 | ||
2280 | if ((di->dqb_valid & QIF_BLIMITS && | |
2281 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2282 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2283 | (di->dqb_valid & QIF_ILIMITS && | |
2284 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2285 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2286 | return -ERANGE; | |
1da177e4 LT |
2287 | |
2288 | spin_lock(&dq_data_lock); | |
2289 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2290 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2291 | check_blim = 1; |
4d59bce4 | 2292 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2293 | } |
2294 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2295 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2296 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2297 | check_blim = 1; |
4d59bce4 | 2298 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2299 | } |
2300 | if (di->dqb_valid & QIF_INODES) { | |
2301 | dm->dqb_curinodes = di->dqb_curinodes; | |
2302 | check_ilim = 1; | |
4d59bce4 | 2303 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2304 | } |
2305 | if (di->dqb_valid & QIF_ILIMITS) { | |
2306 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2307 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2308 | check_ilim = 1; | |
4d59bce4 | 2309 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2310 | } |
4d59bce4 | 2311 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2312 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2313 | check_blim = 1; |
4d59bce4 JK |
2314 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2315 | } | |
2316 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2317 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2318 | check_ilim = 1; |
4d59bce4 JK |
2319 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2320 | } | |
1da177e4 LT |
2321 | |
2322 | if (check_blim) { | |
268157ba JK |
2323 | if (!dm->dqb_bsoftlimit || |
2324 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2325 | dm->dqb_btime = 0; |
2326 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
268157ba JK |
2327 | } else if (!(di->dqb_valid & QIF_BTIME)) |
2328 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2329 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2330 | } |
2331 | if (check_ilim) { | |
268157ba JK |
2332 | if (!dm->dqb_isoftlimit || |
2333 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2334 | dm->dqb_itime = 0; |
2335 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
268157ba JK |
2336 | } else if (!(di->dqb_valid & QIF_ITIME)) |
2337 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2338 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2339 | } |
268157ba JK |
2340 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2341 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2342 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2343 | else | |
2344 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2345 | spin_unlock(&dq_data_lock); | |
2346 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2347 | |
2348 | return 0; | |
1da177e4 LT |
2349 | } |
2350 | ||
268157ba JK |
2351 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, |
2352 | struct if_dqblk *di) | |
1da177e4 LT |
2353 | { |
2354 | struct dquot *dquot; | |
338bf9af | 2355 | int rc; |
1da177e4 | 2356 | |
f55abc0f JK |
2357 | dquot = dqget(sb, id, type); |
2358 | if (!dquot) { | |
2359 | rc = -ESRCH; | |
2360 | goto out; | |
1da177e4 | 2361 | } |
338bf9af | 2362 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2363 | dqput(dquot); |
f55abc0f | 2364 | out: |
338bf9af | 2365 | return rc; |
1da177e4 | 2366 | } |
08d0350c | 2367 | EXPORT_SYMBOL(vfs_set_dqblk); |
1da177e4 LT |
2368 | |
2369 | /* Generic routine for getting common part of quota file information */ | |
2370 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2371 | { | |
2372 | struct mem_dqinfo *mi; | |
2373 | ||
d3be915f | 2374 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2375 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2376 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2377 | return -ESRCH; |
2378 | } | |
2379 | mi = sb_dqopt(sb)->info + type; | |
2380 | spin_lock(&dq_data_lock); | |
2381 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2382 | ii->dqi_igrace = mi->dqi_igrace; | |
2383 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2384 | ii->dqi_valid = IIF_ALL; | |
2385 | spin_unlock(&dq_data_lock); | |
d3be915f | 2386 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2387 | return 0; |
2388 | } | |
08d0350c | 2389 | EXPORT_SYMBOL(vfs_get_dqinfo); |
1da177e4 LT |
2390 | |
2391 | /* Generic routine for setting common part of quota file information */ | |
2392 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2393 | { | |
2394 | struct mem_dqinfo *mi; | |
f55abc0f | 2395 | int err = 0; |
1da177e4 | 2396 | |
d3be915f | 2397 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2398 | if (!sb_has_quota_active(sb, type)) { |
2399 | err = -ESRCH; | |
2400 | goto out; | |
1da177e4 LT |
2401 | } |
2402 | mi = sb_dqopt(sb)->info + type; | |
2403 | spin_lock(&dq_data_lock); | |
2404 | if (ii->dqi_valid & IIF_BGRACE) | |
2405 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2406 | if (ii->dqi_valid & IIF_IGRACE) | |
2407 | mi->dqi_igrace = ii->dqi_igrace; | |
2408 | if (ii->dqi_valid & IIF_FLAGS) | |
268157ba JK |
2409 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | |
2410 | (ii->dqi_flags & DQF_MASK); | |
1da177e4 LT |
2411 | spin_unlock(&dq_data_lock); |
2412 | mark_info_dirty(sb, type); | |
2413 | /* Force write to disk */ | |
2414 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2415 | out: |
d3be915f | 2416 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2417 | return err; |
1da177e4 | 2418 | } |
08d0350c | 2419 | EXPORT_SYMBOL(vfs_set_dqinfo); |
1da177e4 | 2420 | |
0d54b217 | 2421 | const struct quotactl_ops vfs_quotactl_ops = { |
1da177e4 LT |
2422 | .quota_on = vfs_quota_on, |
2423 | .quota_off = vfs_quota_off, | |
2424 | .quota_sync = vfs_quota_sync, | |
2425 | .get_info = vfs_get_dqinfo, | |
2426 | .set_info = vfs_set_dqinfo, | |
2427 | .get_dqblk = vfs_get_dqblk, | |
2428 | .set_dqblk = vfs_set_dqblk | |
2429 | }; | |
2430 | ||
2431 | static ctl_table fs_dqstats_table[] = { | |
2432 | { | |
1da177e4 LT |
2433 | .procname = "lookups", |
2434 | .data = &dqstats.lookups, | |
2435 | .maxlen = sizeof(int), | |
2436 | .mode = 0444, | |
6d456111 | 2437 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2438 | }, |
2439 | { | |
1da177e4 LT |
2440 | .procname = "drops", |
2441 | .data = &dqstats.drops, | |
2442 | .maxlen = sizeof(int), | |
2443 | .mode = 0444, | |
6d456111 | 2444 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2445 | }, |
2446 | { | |
1da177e4 LT |
2447 | .procname = "reads", |
2448 | .data = &dqstats.reads, | |
2449 | .maxlen = sizeof(int), | |
2450 | .mode = 0444, | |
6d456111 | 2451 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2452 | }, |
2453 | { | |
1da177e4 LT |
2454 | .procname = "writes", |
2455 | .data = &dqstats.writes, | |
2456 | .maxlen = sizeof(int), | |
2457 | .mode = 0444, | |
6d456111 | 2458 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2459 | }, |
2460 | { | |
1da177e4 LT |
2461 | .procname = "cache_hits", |
2462 | .data = &dqstats.cache_hits, | |
2463 | .maxlen = sizeof(int), | |
2464 | .mode = 0444, | |
6d456111 | 2465 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2466 | }, |
2467 | { | |
1da177e4 LT |
2468 | .procname = "allocated_dquots", |
2469 | .data = &dqstats.allocated_dquots, | |
2470 | .maxlen = sizeof(int), | |
2471 | .mode = 0444, | |
6d456111 | 2472 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2473 | }, |
2474 | { | |
1da177e4 LT |
2475 | .procname = "free_dquots", |
2476 | .data = &dqstats.free_dquots, | |
2477 | .maxlen = sizeof(int), | |
2478 | .mode = 0444, | |
6d456111 | 2479 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2480 | }, |
2481 | { | |
1da177e4 LT |
2482 | .procname = "syncs", |
2483 | .data = &dqstats.syncs, | |
2484 | .maxlen = sizeof(int), | |
2485 | .mode = 0444, | |
6d456111 | 2486 | .proc_handler = proc_dointvec, |
1da177e4 | 2487 | }, |
8e893469 | 2488 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2489 | { |
1da177e4 LT |
2490 | .procname = "warnings", |
2491 | .data = &flag_print_warnings, | |
2492 | .maxlen = sizeof(int), | |
2493 | .mode = 0644, | |
6d456111 | 2494 | .proc_handler = proc_dointvec, |
1da177e4 | 2495 | }, |
8e893469 | 2496 | #endif |
ab09203e | 2497 | { }, |
1da177e4 LT |
2498 | }; |
2499 | ||
2500 | static ctl_table fs_table[] = { | |
2501 | { | |
1da177e4 LT |
2502 | .procname = "quota", |
2503 | .mode = 0555, | |
2504 | .child = fs_dqstats_table, | |
2505 | }, | |
ab09203e | 2506 | { }, |
1da177e4 LT |
2507 | }; |
2508 | ||
2509 | static ctl_table sys_table[] = { | |
2510 | { | |
1da177e4 LT |
2511 | .procname = "fs", |
2512 | .mode = 0555, | |
2513 | .child = fs_table, | |
2514 | }, | |
ab09203e | 2515 | { }, |
1da177e4 LT |
2516 | }; |
2517 | ||
2518 | static int __init dquot_init(void) | |
2519 | { | |
2520 | int i; | |
2521 | unsigned long nr_hash, order; | |
2522 | ||
2523 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2524 | ||
0b4d4147 | 2525 | register_sysctl_table(sys_table); |
1da177e4 | 2526 | |
20c2df83 | 2527 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2528 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2529 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2530 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2531 | NULL); |
1da177e4 LT |
2532 | |
2533 | order = 0; | |
2534 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2535 | if (!dquot_hash) | |
2536 | panic("Cannot create dquot hash table"); | |
2537 | ||
2538 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2539 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2540 | dq_hash_bits = 0; | |
2541 | do { | |
2542 | dq_hash_bits++; | |
2543 | } while (nr_hash >> dq_hash_bits); | |
2544 | dq_hash_bits--; | |
2545 | ||
2546 | nr_hash = 1UL << dq_hash_bits; | |
2547 | dq_hash_mask = nr_hash - 1; | |
2548 | for (i = 0; i < nr_hash; i++) | |
2549 | INIT_HLIST_HEAD(dquot_hash + i); | |
2550 | ||
2551 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2552 | nr_hash, order, (PAGE_SIZE << order)); | |
2553 | ||
8e1f936b | 2554 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2555 | |
2556 | return 0; | |
2557 | } | |
2558 | module_init(dquot_init); |