]>
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 | ||
1da177e4 | 83 | /* |
cc33412f | 84 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
dde95888 | 85 | * and quota formats. |
cc33412f JK |
86 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and |
87 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 88 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
89 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
90 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
91 | * about latest values take it as well. | |
1da177e4 | 92 | * |
cc33412f JK |
93 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
94 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
95 | * |
96 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
97 | * the life of the dquot structure and so needn't to be protected by a lock | |
98 | * | |
99 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
100 | * operation is just reading pointers from inode (or not using them at all) the | |
26245c94 JK |
101 | * read lock is enough. If pointers are altered function must hold write lock. |
102 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that | |
103 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
104 | * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they | |
105 | * have to do all pointer modifications before dropping dqptr_sem. This makes | |
106 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and | |
107 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 108 | * |
d3be915f | 109 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
110 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
111 | * Currently dquot is locked only when it is being read to memory (or space for | |
112 | * it is being allocated) on the first dqget() and when it is being released on | |
113 | * the last dqput(). The allocation and release oparations are serialized by | |
114 | * the dq_lock and by checking the use count in dquot_release(). Write | |
115 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
116 | * spinlock to internal buffers before writing. | |
117 | * | |
118 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
119 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
120 | * dqio_mutex | |
cc33412f JK |
121 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
122 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
123 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
124 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
125 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
126 | * called with dqptr_sem held. | |
d3be915f | 127 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
128 | */ |
129 | ||
c516610c JK |
130 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
131 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
132 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 133 | EXPORT_SYMBOL(dq_data_lock); |
1da177e4 | 134 | |
fb5ffb0e JZ |
135 | void __quota_error(struct super_block *sb, const char *func, |
136 | const char *fmt, ...) | |
137 | { | |
138 | va_list args; | |
139 | ||
140 | if (printk_ratelimit()) { | |
141 | va_start(args, fmt); | |
142 | printk(KERN_ERR "Quota error (device %s): %s: ", | |
143 | sb->s_id, func); | |
144 | vprintk(fmt, args); | |
145 | printk("\n"); | |
146 | va_end(args); | |
147 | } | |
148 | } | |
149 | EXPORT_SYMBOL(__quota_error); | |
150 | ||
da8d1ba2 | 151 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 152 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 153 | #endif |
1da177e4 LT |
154 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
155 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
156 | ||
157 | /* SLAB cache for dquot structures */ | |
e18b890b | 158 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
159 | |
160 | int register_quota_format(struct quota_format_type *fmt) | |
161 | { | |
162 | spin_lock(&dq_list_lock); | |
163 | fmt->qf_next = quota_formats; | |
164 | quota_formats = fmt; | |
165 | spin_unlock(&dq_list_lock); | |
166 | return 0; | |
167 | } | |
08d0350c | 168 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
169 | |
170 | void unregister_quota_format(struct quota_format_type *fmt) | |
171 | { | |
172 | struct quota_format_type **actqf; | |
173 | ||
174 | spin_lock(&dq_list_lock); | |
268157ba JK |
175 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
176 | actqf = &(*actqf)->qf_next) | |
177 | ; | |
1da177e4 LT |
178 | if (*actqf) |
179 | *actqf = (*actqf)->qf_next; | |
180 | spin_unlock(&dq_list_lock); | |
181 | } | |
08d0350c | 182 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
183 | |
184 | static struct quota_format_type *find_quota_format(int id) | |
185 | { | |
186 | struct quota_format_type *actqf; | |
187 | ||
188 | spin_lock(&dq_list_lock); | |
268157ba JK |
189 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
190 | actqf = actqf->qf_next) | |
191 | ; | |
1da177e4 LT |
192 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
193 | int qm; | |
194 | ||
195 | spin_unlock(&dq_list_lock); | |
196 | ||
268157ba JK |
197 | for (qm = 0; module_names[qm].qm_fmt_id && |
198 | module_names[qm].qm_fmt_id != id; qm++) | |
199 | ; | |
200 | if (!module_names[qm].qm_fmt_id || | |
201 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
202 | return NULL; |
203 | ||
204 | spin_lock(&dq_list_lock); | |
268157ba JK |
205 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
206 | actqf = actqf->qf_next) | |
207 | ; | |
1da177e4 LT |
208 | if (actqf && !try_module_get(actqf->qf_owner)) |
209 | actqf = NULL; | |
210 | } | |
211 | spin_unlock(&dq_list_lock); | |
212 | return actqf; | |
213 | } | |
214 | ||
215 | static void put_quota_format(struct quota_format_type *fmt) | |
216 | { | |
217 | module_put(fmt->qf_owner); | |
218 | } | |
219 | ||
220 | /* | |
221 | * Dquot List Management: | |
222 | * The quota code uses three lists for dquot management: the inuse_list, | |
223 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
224 | * on all three lists, depending on its current state. | |
225 | * | |
226 | * All dquots are placed to the end of inuse_list when first created, and this | |
227 | * list is used for invalidate operation, which must look at every dquot. | |
228 | * | |
229 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
230 | * and this list is searched whenever we need an available dquot. Dquots are | |
231 | * removed from the list as soon as they are used again, and | |
232 | * dqstats.free_dquots gives the number of dquots on the list. When | |
233 | * dquot is invalidated it's completely released from memory. | |
234 | * | |
235 | * Dquots with a specific identity (device, type and id) are placed on | |
236 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
237 | * mechanism to locate a specific dquot. | |
238 | */ | |
239 | ||
240 | static LIST_HEAD(inuse_list); | |
241 | static LIST_HEAD(free_dquots); | |
242 | static unsigned int dq_hash_bits, dq_hash_mask; | |
243 | static struct hlist_head *dquot_hash; | |
244 | ||
245 | struct dqstats dqstats; | |
08d0350c | 246 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 247 | |
0a5a9c72 | 248 | static qsize_t inode_get_rsv_space(struct inode *inode); |
871a2931 | 249 | static void __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 250 | |
1da177e4 LT |
251 | static inline unsigned int |
252 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
253 | { | |
254 | unsigned long tmp; | |
255 | ||
256 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
257 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Following list functions expect dq_list_lock to be held | |
262 | */ | |
263 | static inline void insert_dquot_hash(struct dquot *dquot) | |
264 | { | |
268157ba JK |
265 | struct hlist_head *head; |
266 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
1da177e4 LT |
267 | hlist_add_head(&dquot->dq_hash, head); |
268 | } | |
269 | ||
270 | static inline void remove_dquot_hash(struct dquot *dquot) | |
271 | { | |
272 | hlist_del_init(&dquot->dq_hash); | |
273 | } | |
274 | ||
7a2435d8 JK |
275 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
276 | unsigned int id, int type) | |
1da177e4 LT |
277 | { |
278 | struct hlist_node *node; | |
279 | struct dquot *dquot; | |
280 | ||
281 | hlist_for_each (node, dquot_hash+hashent) { | |
282 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
268157ba JK |
283 | if (dquot->dq_sb == sb && dquot->dq_id == id && |
284 | dquot->dq_type == type) | |
1da177e4 LT |
285 | return dquot; |
286 | } | |
dd6f3c6d | 287 | return NULL; |
1da177e4 LT |
288 | } |
289 | ||
290 | /* Add a dquot to the tail of the free list */ | |
291 | static inline void put_dquot_last(struct dquot *dquot) | |
292 | { | |
8e13059a | 293 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 294 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
295 | } |
296 | ||
297 | static inline void remove_free_dquot(struct dquot *dquot) | |
298 | { | |
299 | if (list_empty(&dquot->dq_free)) | |
300 | return; | |
301 | list_del_init(&dquot->dq_free); | |
dde95888 | 302 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
303 | } |
304 | ||
305 | static inline void put_inuse(struct dquot *dquot) | |
306 | { | |
307 | /* We add to the back of inuse list so we don't have to restart | |
308 | * when traversing this list and we block */ | |
8e13059a | 309 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 310 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
311 | } |
312 | ||
313 | static inline void remove_inuse(struct dquot *dquot) | |
314 | { | |
dde95888 | 315 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
316 | list_del(&dquot->dq_inuse); |
317 | } | |
318 | /* | |
319 | * End of list functions needing dq_list_lock | |
320 | */ | |
321 | ||
322 | static void wait_on_dquot(struct dquot *dquot) | |
323 | { | |
d3be915f IM |
324 | mutex_lock(&dquot->dq_lock); |
325 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
326 | } |
327 | ||
03f6e92b JK |
328 | static inline int dquot_dirty(struct dquot *dquot) |
329 | { | |
330 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
331 | } | |
332 | ||
333 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
334 | { | |
335 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
336 | } | |
1da177e4 | 337 | |
eabf290d | 338 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
339 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
340 | { | |
eabf290d DM |
341 | int ret = 1; |
342 | ||
343 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ | |
344 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
345 | return 1; | |
346 | ||
1da177e4 | 347 | spin_lock(&dq_list_lock); |
eabf290d | 348 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 LT |
349 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
350 | info[dquot->dq_type].dqi_dirty_list); | |
eabf290d DM |
351 | ret = 0; |
352 | } | |
1da177e4 | 353 | spin_unlock(&dq_list_lock); |
eabf290d | 354 | return ret; |
1da177e4 | 355 | } |
08d0350c | 356 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 357 | |
dc52dd3a DM |
358 | /* Dirtify all the dquots - this can block when journalling */ |
359 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
360 | { | |
361 | int ret, err, cnt; | |
362 | ||
363 | ret = err = 0; | |
364 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
365 | if (dquot[cnt]) | |
366 | /* Even in case of error we have to continue */ | |
367 | ret = mark_dquot_dirty(dquot[cnt]); | |
368 | if (!err) | |
369 | err = ret; | |
370 | } | |
371 | return err; | |
372 | } | |
373 | ||
374 | static inline void dqput_all(struct dquot **dquot) | |
375 | { | |
376 | unsigned int cnt; | |
377 | ||
378 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
379 | dqput(dquot[cnt]); | |
380 | } | |
381 | ||
1da177e4 LT |
382 | /* This function needs dq_list_lock */ |
383 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
384 | { | |
385 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
386 | return 0; | |
387 | list_del_init(&dquot->dq_dirty); | |
388 | return 1; | |
389 | } | |
390 | ||
391 | void mark_info_dirty(struct super_block *sb, int type) | |
392 | { | |
393 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
394 | } | |
395 | EXPORT_SYMBOL(mark_info_dirty); | |
396 | ||
397 | /* | |
398 | * Read dquot from disk and alloc space for it | |
399 | */ | |
400 | ||
401 | int dquot_acquire(struct dquot *dquot) | |
402 | { | |
403 | int ret = 0, ret2 = 0; | |
404 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
405 | ||
d3be915f IM |
406 | mutex_lock(&dquot->dq_lock); |
407 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
408 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
409 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
410 | if (ret < 0) | |
411 | goto out_iolock; | |
412 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
413 | /* Instantiate dquot if needed */ | |
414 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
415 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
416 | /* Write the info if needed */ | |
268157ba JK |
417 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
418 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
419 | dquot->dq_sb, dquot->dq_type); | |
420 | } | |
1da177e4 LT |
421 | if (ret < 0) |
422 | goto out_iolock; | |
423 | if (ret2 < 0) { | |
424 | ret = ret2; | |
425 | goto out_iolock; | |
426 | } | |
427 | } | |
428 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
429 | out_iolock: | |
d3be915f IM |
430 | mutex_unlock(&dqopt->dqio_mutex); |
431 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
432 | return ret; |
433 | } | |
08d0350c | 434 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
435 | |
436 | /* | |
437 | * Write dquot to disk | |
438 | */ | |
439 | int dquot_commit(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(&dqopt->dqio_mutex); |
1da177e4 LT |
445 | spin_lock(&dq_list_lock); |
446 | if (!clear_dquot_dirty(dquot)) { | |
447 | spin_unlock(&dq_list_lock); | |
448 | goto out_sem; | |
449 | } | |
450 | spin_unlock(&dq_list_lock); | |
451 | /* Inactive dquot can be only if there was error during read/init | |
452 | * => we have better not writing it */ | |
453 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
454 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
268157ba JK |
455 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
456 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
457 | dquot->dq_sb, dquot->dq_type); | |
458 | } | |
1da177e4 LT |
459 | if (ret >= 0) |
460 | ret = ret2; | |
461 | } | |
462 | out_sem: | |
d3be915f | 463 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
464 | return ret; |
465 | } | |
08d0350c | 466 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
467 | |
468 | /* | |
469 | * Release dquot | |
470 | */ | |
471 | int dquot_release(struct dquot *dquot) | |
472 | { | |
473 | int ret = 0, ret2 = 0; | |
474 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
475 | ||
d3be915f | 476 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
477 | /* Check whether we are not racing with some other dqget() */ |
478 | if (atomic_read(&dquot->dq_count) > 1) | |
479 | goto out_dqlock; | |
d3be915f | 480 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
481 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
482 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
483 | /* Write the info */ | |
268157ba JK |
484 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
485 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
486 | dquot->dq_sb, dquot->dq_type); | |
487 | } | |
1da177e4 LT |
488 | if (ret >= 0) |
489 | ret = ret2; | |
490 | } | |
491 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 492 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 493 | out_dqlock: |
d3be915f | 494 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
495 | return ret; |
496 | } | |
08d0350c | 497 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 498 | |
7d9056ba | 499 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
500 | { |
501 | kmem_cache_free(dquot_cachep, dquot); | |
502 | } | |
7d9056ba | 503 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
504 | |
505 | static inline void do_destroy_dquot(struct dquot *dquot) | |
506 | { | |
507 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
508 | } | |
509 | ||
1da177e4 LT |
510 | /* Invalidate all dquots on the list. Note that this function is called after |
511 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
512 | * quota users. There can still be some users of quotas due to inodes being |
513 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 514 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 515 | */ |
1da177e4 LT |
516 | static void invalidate_dquots(struct super_block *sb, int type) |
517 | { | |
c33ed271 | 518 | struct dquot *dquot, *tmp; |
1da177e4 | 519 | |
6362e4d4 | 520 | restart: |
1da177e4 | 521 | spin_lock(&dq_list_lock); |
c33ed271 | 522 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
523 | if (dquot->dq_sb != sb) |
524 | continue; | |
525 | if (dquot->dq_type != type) | |
526 | continue; | |
6362e4d4 JK |
527 | /* Wait for dquot users */ |
528 | if (atomic_read(&dquot->dq_count)) { | |
529 | DEFINE_WAIT(wait); | |
530 | ||
531 | atomic_inc(&dquot->dq_count); | |
532 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
533 | TASK_UNINTERRUPTIBLE); | |
534 | spin_unlock(&dq_list_lock); | |
535 | /* Once dqput() wakes us up, we know it's time to free | |
536 | * the dquot. | |
537 | * IMPORTANT: we rely on the fact that there is always | |
538 | * at most one process waiting for dquot to free. | |
539 | * Otherwise dq_count would be > 1 and we would never | |
540 | * wake up. | |
541 | */ | |
542 | if (atomic_read(&dquot->dq_count) > 1) | |
543 | schedule(); | |
544 | finish_wait(&dquot->dq_wait_unused, &wait); | |
545 | dqput(dquot); | |
546 | /* At this moment dquot() need not exist (it could be | |
547 | * reclaimed by prune_dqcache(). Hence we must | |
548 | * restart. */ | |
549 | goto restart; | |
550 | } | |
551 | /* | |
552 | * Quota now has no users and it has been written on last | |
553 | * dqput() | |
554 | */ | |
1da177e4 LT |
555 | remove_dquot_hash(dquot); |
556 | remove_free_dquot(dquot); | |
557 | remove_inuse(dquot); | |
74f783af | 558 | do_destroy_dquot(dquot); |
1da177e4 LT |
559 | } |
560 | spin_unlock(&dq_list_lock); | |
561 | } | |
562 | ||
12c77527 JK |
563 | /* Call callback for every active dquot on given filesystem */ |
564 | int dquot_scan_active(struct super_block *sb, | |
565 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
566 | unsigned long priv) | |
567 | { | |
568 | struct dquot *dquot, *old_dquot = NULL; | |
569 | int ret = 0; | |
570 | ||
571 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
572 | spin_lock(&dq_list_lock); | |
573 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
574 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
575 | continue; | |
576 | if (dquot->dq_sb != sb) | |
577 | continue; | |
578 | /* Now we have active dquot so we can just increase use count */ | |
579 | atomic_inc(&dquot->dq_count); | |
12c77527 | 580 | spin_unlock(&dq_list_lock); |
dde95888 | 581 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
582 | dqput(old_dquot); |
583 | old_dquot = dquot; | |
584 | ret = fn(dquot, priv); | |
585 | if (ret < 0) | |
586 | goto out; | |
587 | spin_lock(&dq_list_lock); | |
588 | /* We are safe to continue now because our dquot could not | |
589 | * be moved out of the inuse list while we hold the reference */ | |
590 | } | |
591 | spin_unlock(&dq_list_lock); | |
592 | out: | |
593 | dqput(old_dquot); | |
594 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
595 | return ret; | |
596 | } | |
08d0350c | 597 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 598 | |
287a8095 | 599 | int dquot_quota_sync(struct super_block *sb, int type, int wait) |
1da177e4 LT |
600 | { |
601 | struct list_head *dirty; | |
602 | struct dquot *dquot; | |
603 | struct quota_info *dqopt = sb_dqopt(sb); | |
604 | int cnt; | |
605 | ||
d3be915f | 606 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
607 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
608 | if (type != -1 && cnt != type) | |
609 | continue; | |
f55abc0f | 610 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
611 | continue; |
612 | spin_lock(&dq_list_lock); | |
613 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
614 | while (!list_empty(dirty)) { | |
268157ba JK |
615 | dquot = list_first_entry(dirty, struct dquot, |
616 | dq_dirty); | |
1da177e4 LT |
617 | /* Dirty and inactive can be only bad dquot... */ |
618 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
619 | clear_dquot_dirty(dquot); | |
620 | continue; | |
621 | } | |
622 | /* Now we have active dquot from which someone is | |
623 | * holding reference so we can safely just increase | |
624 | * use count */ | |
625 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 626 | spin_unlock(&dq_list_lock); |
dde95888 | 627 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
628 | sb->dq_op->write_dquot(dquot); |
629 | dqput(dquot); | |
630 | spin_lock(&dq_list_lock); | |
631 | } | |
632 | spin_unlock(&dq_list_lock); | |
633 | } | |
634 | ||
635 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
636 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
637 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 638 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 639 | dqstats_inc(DQST_SYNCS); |
d3be915f | 640 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 641 | |
5fb324ad CH |
642 | if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) |
643 | return 0; | |
644 | ||
645 | /* This is not very clever (and fast) but currently I don't know about | |
646 | * any other simple way of getting quota data to disk and we must get | |
647 | * them there for userspace to be visible... */ | |
648 | if (sb->s_op->sync_fs) | |
649 | sb->s_op->sync_fs(sb, 1); | |
650 | sync_blockdev(sb->s_bdev); | |
651 | ||
652 | /* | |
653 | * Now when everything is written we can discard the pagecache so | |
654 | * that userspace sees the changes. | |
655 | */ | |
656 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
657 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
658 | if (type != -1 && cnt != type) | |
659 | continue; | |
660 | if (!sb_has_quota_active(sb, cnt)) | |
661 | continue; | |
662 | mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, | |
663 | I_MUTEX_QUOTA); | |
664 | truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); | |
665 | mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); | |
666 | } | |
667 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
668 | ||
1da177e4 LT |
669 | return 0; |
670 | } | |
287a8095 | 671 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 LT |
672 | |
673 | /* Free unused dquots from cache */ | |
674 | static void prune_dqcache(int count) | |
675 | { | |
676 | struct list_head *head; | |
677 | struct dquot *dquot; | |
678 | ||
679 | head = free_dquots.prev; | |
680 | while (head != &free_dquots && count) { | |
681 | dquot = list_entry(head, struct dquot, dq_free); | |
682 | remove_dquot_hash(dquot); | |
683 | remove_free_dquot(dquot); | |
684 | remove_inuse(dquot); | |
74f783af | 685 | do_destroy_dquot(dquot); |
1da177e4 LT |
686 | count--; |
687 | head = free_dquots.prev; | |
688 | } | |
689 | } | |
690 | ||
691 | /* | |
692 | * This is called from kswapd when we think we need some | |
693 | * more memory | |
694 | */ | |
7f8275d0 | 695 | static int shrink_dqcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask) |
1da177e4 LT |
696 | { |
697 | if (nr) { | |
698 | spin_lock(&dq_list_lock); | |
699 | prune_dqcache(nr); | |
700 | spin_unlock(&dq_list_lock); | |
701 | } | |
f32764bd DM |
702 | return ((unsigned) |
703 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]) | |
704 | /100) * sysctl_vfs_cache_pressure; | |
1da177e4 LT |
705 | } |
706 | ||
8e1f936b RR |
707 | static struct shrinker dqcache_shrinker = { |
708 | .shrink = shrink_dqcache_memory, | |
709 | .seeks = DEFAULT_SEEKS, | |
710 | }; | |
711 | ||
1da177e4 LT |
712 | /* |
713 | * Put reference to dquot | |
714 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 715 | */ |
3d9ea253 | 716 | void dqput(struct dquot *dquot) |
1da177e4 | 717 | { |
b48d3805 JK |
718 | int ret; |
719 | ||
1da177e4 LT |
720 | if (!dquot) |
721 | return; | |
62af9b52 | 722 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 723 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e JZ |
724 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
725 | quotatypes[dquot->dq_type], dquot->dq_id); | |
1da177e4 LT |
726 | BUG(); |
727 | } | |
728 | #endif | |
dde95888 | 729 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
730 | we_slept: |
731 | spin_lock(&dq_list_lock); | |
732 | if (atomic_read(&dquot->dq_count) > 1) { | |
733 | /* We have more than one user... nothing to do */ | |
734 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 735 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 736 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
737 | atomic_read(&dquot->dq_count) == 1) |
738 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
739 | spin_unlock(&dq_list_lock); |
740 | return; | |
741 | } | |
742 | /* Need to release dquot? */ | |
743 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
744 | spin_unlock(&dq_list_lock); | |
745 | /* Commit dquot before releasing */ | |
b48d3805 JK |
746 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
747 | if (ret < 0) { | |
fb5ffb0e JZ |
748 | quota_error(dquot->dq_sb, "Can't write quota structure" |
749 | " (error %d). Quota may get out of sync!", | |
750 | ret); | |
b48d3805 JK |
751 | /* |
752 | * We clear dirty bit anyway, so that we avoid | |
753 | * infinite loop here | |
754 | */ | |
755 | spin_lock(&dq_list_lock); | |
756 | clear_dquot_dirty(dquot); | |
757 | spin_unlock(&dq_list_lock); | |
758 | } | |
1da177e4 LT |
759 | goto we_slept; |
760 | } | |
761 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
762 | clear_dquot_dirty(dquot); | |
763 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
764 | spin_unlock(&dq_list_lock); | |
765 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
766 | goto we_slept; | |
767 | } | |
768 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 769 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 770 | /* sanity check */ |
8abf6a47 | 771 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
772 | #endif |
773 | put_dquot_last(dquot); | |
774 | spin_unlock(&dq_list_lock); | |
775 | } | |
08d0350c | 776 | EXPORT_SYMBOL(dqput); |
1da177e4 | 777 | |
7d9056ba | 778 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
779 | { |
780 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
781 | } | |
7d9056ba | 782 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 783 | |
1da177e4 LT |
784 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
785 | { | |
786 | struct dquot *dquot; | |
787 | ||
74f783af | 788 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 789 | if(!dquot) |
dd6f3c6d | 790 | return NULL; |
1da177e4 | 791 | |
d3be915f | 792 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
793 | INIT_LIST_HEAD(&dquot->dq_free); |
794 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
795 | INIT_HLIST_NODE(&dquot->dq_hash); | |
796 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 797 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
798 | dquot->dq_sb = sb; |
799 | dquot->dq_type = type; | |
800 | atomic_set(&dquot->dq_count, 1); | |
801 | ||
802 | return dquot; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Get reference to dquot | |
cc33412f JK |
807 | * |
808 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
809 | * destroying our dquot by: | |
810 | * a) checking for quota flags under dq_list_lock and | |
811 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 812 | */ |
3d9ea253 | 813 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
814 | { |
815 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 816 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 817 | |
f55abc0f | 818 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 819 | return NULL; |
1da177e4 LT |
820 | we_slept: |
821 | spin_lock(&dq_list_lock); | |
cc33412f JK |
822 | spin_lock(&dq_state_lock); |
823 | if (!sb_has_quota_active(sb, type)) { | |
824 | spin_unlock(&dq_state_lock); | |
825 | spin_unlock(&dq_list_lock); | |
826 | goto out; | |
827 | } | |
828 | spin_unlock(&dq_state_lock); | |
829 | ||
dd6f3c6d JK |
830 | dquot = find_dquot(hashent, sb, id, type); |
831 | if (!dquot) { | |
832 | if (!empty) { | |
1da177e4 | 833 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
834 | empty = get_empty_dquot(sb, type); |
835 | if (!empty) | |
1da177e4 LT |
836 | schedule(); /* Try to wait for a moment... */ |
837 | goto we_slept; | |
838 | } | |
839 | dquot = empty; | |
dd6f3c6d | 840 | empty = NULL; |
1da177e4 LT |
841 | dquot->dq_id = id; |
842 | /* all dquots go on the inuse_list */ | |
843 | put_inuse(dquot); | |
844 | /* hash it first so it can be found */ | |
845 | insert_dquot_hash(dquot); | |
1da177e4 | 846 | spin_unlock(&dq_list_lock); |
dde95888 | 847 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
848 | } else { |
849 | if (!atomic_read(&dquot->dq_count)) | |
850 | remove_free_dquot(dquot); | |
851 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 852 | spin_unlock(&dq_list_lock); |
dde95888 DM |
853 | dqstats_inc(DQST_CACHE_HITS); |
854 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 855 | } |
268157ba JK |
856 | /* Wait for dq_lock - after this we know that either dquot_release() is |
857 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 858 | wait_on_dquot(dquot); |
268157ba JK |
859 | /* Read the dquot / allocate space in quota file */ |
860 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
861 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 862 | dqput(dquot); |
dd6f3c6d | 863 | dquot = NULL; |
cc33412f | 864 | goto out; |
1da177e4 | 865 | } |
62af9b52 | 866 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 867 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 868 | #endif |
cc33412f JK |
869 | out: |
870 | if (empty) | |
871 | do_destroy_dquot(empty); | |
1da177e4 LT |
872 | |
873 | return dquot; | |
874 | } | |
08d0350c | 875 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
876 | |
877 | static int dqinit_needed(struct inode *inode, int type) | |
878 | { | |
879 | int cnt; | |
880 | ||
881 | if (IS_NOQUOTA(inode)) | |
882 | return 0; | |
883 | if (type != -1) | |
dd6f3c6d | 884 | return !inode->i_dquot[type]; |
1da177e4 | 885 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 886 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
887 | return 1; |
888 | return 0; | |
889 | } | |
890 | ||
d3be915f | 891 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
892 | static void add_dquot_ref(struct super_block *sb, int type) |
893 | { | |
941d2380 | 894 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 895 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 896 | int reserved = 0; |
4c5e6c0e | 897 | #endif |
1da177e4 | 898 | |
d003fb70 CH |
899 | spin_lock(&inode_lock); |
900 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
a4ffdde6 | 901 | if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) |
aabb8fdb | 902 | continue; |
62af9b52 | 903 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 JK |
904 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
905 | reserved = 1; | |
4c5e6c0e | 906 | #endif |
d003fb70 CH |
907 | if (!atomic_read(&inode->i_writecount)) |
908 | continue; | |
909 | if (!dqinit_needed(inode, type)) | |
910 | continue; | |
d003fb70 CH |
911 | |
912 | __iget(inode); | |
913 | spin_unlock(&inode_lock); | |
914 | ||
941d2380 | 915 | iput(old_inode); |
871a2931 | 916 | __dquot_initialize(inode, type); |
941d2380 JK |
917 | /* We hold a reference to 'inode' so it couldn't have been |
918 | * removed from s_inodes list while we dropped the inode_lock. | |
919 | * We cannot iput the inode now as we can be holding the last | |
920 | * reference and we cannot iput it under inode_lock. So we | |
921 | * keep the reference and iput it later. */ | |
922 | old_inode = inode; | |
923 | spin_lock(&inode_lock); | |
1da177e4 | 924 | } |
d003fb70 | 925 | spin_unlock(&inode_lock); |
941d2380 | 926 | iput(old_inode); |
0a5a9c72 | 927 | |
62af9b52 | 928 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 929 | if (reserved) { |
fb5ffb0e JZ |
930 | quota_error(sb, "Writes happened before quota was turned on " |
931 | "thus quota information is probably inconsistent. " | |
932 | "Please run quotacheck(8)"); | |
0a5a9c72 | 933 | } |
4c5e6c0e | 934 | #endif |
1da177e4 LT |
935 | } |
936 | ||
268157ba JK |
937 | /* |
938 | * Return 0 if dqput() won't block. | |
939 | * (note that 1 doesn't necessarily mean blocking) | |
940 | */ | |
1da177e4 LT |
941 | static inline int dqput_blocks(struct dquot *dquot) |
942 | { | |
943 | if (atomic_read(&dquot->dq_count) <= 1) | |
944 | return 1; | |
945 | return 0; | |
946 | } | |
947 | ||
268157ba JK |
948 | /* |
949 | * Remove references to dquots from inode and add dquot to list for freeing | |
950 | * if we have the last referece to dquot | |
951 | * We can't race with anybody because we hold dqptr_sem for writing... | |
952 | */ | |
e5f00f42 AB |
953 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
954 | struct list_head *tofree_head) | |
1da177e4 LT |
955 | { |
956 | struct dquot *dquot = inode->i_dquot[type]; | |
957 | ||
dd6f3c6d JK |
958 | inode->i_dquot[type] = NULL; |
959 | if (dquot) { | |
1da177e4 | 960 | if (dqput_blocks(dquot)) { |
62af9b52 | 961 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 962 | if (atomic_read(&dquot->dq_count) != 1) |
fb5ffb0e JZ |
963 | quota_error(inode->i_sb, "Adding dquot with " |
964 | "dq_count %d to dispose list", | |
965 | atomic_read(&dquot->dq_count)); | |
1da177e4 LT |
966 | #endif |
967 | spin_lock(&dq_list_lock); | |
268157ba JK |
968 | /* As dquot must have currently users it can't be on |
969 | * the free list... */ | |
970 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
971 | spin_unlock(&dq_list_lock); |
972 | return 1; | |
973 | } | |
974 | else | |
975 | dqput(dquot); /* We have guaranteed we won't block */ | |
976 | } | |
977 | return 0; | |
978 | } | |
979 | ||
268157ba JK |
980 | /* |
981 | * Free list of dquots | |
982 | * Dquots are removed from inodes and no new references can be got so we are | |
983 | * the only ones holding reference | |
984 | */ | |
1da177e4 LT |
985 | static void put_dquot_list(struct list_head *tofree_head) |
986 | { | |
987 | struct list_head *act_head; | |
988 | struct dquot *dquot; | |
989 | ||
990 | act_head = tofree_head->next; | |
1da177e4 LT |
991 | while (act_head != tofree_head) { |
992 | dquot = list_entry(act_head, struct dquot, dq_free); | |
993 | act_head = act_head->next; | |
268157ba JK |
994 | /* Remove dquot from the list so we won't have problems... */ |
995 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
996 | dqput(dquot); |
997 | } | |
998 | } | |
999 | ||
fb58b731 CH |
1000 | static void remove_dquot_ref(struct super_block *sb, int type, |
1001 | struct list_head *tofree_head) | |
1002 | { | |
1003 | struct inode *inode; | |
7af9cce8 | 1004 | int reserved = 0; |
fb58b731 CH |
1005 | |
1006 | spin_lock(&inode_lock); | |
1007 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
aabb8fdb NP |
1008 | /* |
1009 | * We have to scan also I_NEW inodes because they can already | |
1010 | * have quota pointer initialized. Luckily, we need to touch | |
1011 | * only quota pointers and these have separate locking | |
1012 | * (dqptr_sem). | |
1013 | */ | |
7af9cce8 DM |
1014 | if (!IS_NOQUOTA(inode)) { |
1015 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1016 | reserved = 1; | |
fb58b731 | 1017 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1018 | } |
fb58b731 CH |
1019 | } |
1020 | spin_unlock(&inode_lock); | |
7af9cce8 DM |
1021 | #ifdef CONFIG_QUOTA_DEBUG |
1022 | if (reserved) { | |
1023 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1024 | " was disabled thus quota information is probably " | |
1025 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1026 | } | |
1027 | #endif | |
fb58b731 CH |
1028 | } |
1029 | ||
1da177e4 LT |
1030 | /* Gather all references from inodes and drop them */ |
1031 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1032 | { | |
1033 | LIST_HEAD(tofree_head); | |
1034 | ||
fb58b731 CH |
1035 | if (sb->dq_op) { |
1036 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1037 | remove_dquot_ref(sb, type, &tofree_head); | |
1038 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
1039 | put_dquot_list(&tofree_head); | |
1040 | } | |
1da177e4 LT |
1041 | } |
1042 | ||
12095460 | 1043 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1044 | { |
1045 | dquot->dq_dqb.dqb_curinodes += number; | |
1046 | } | |
1047 | ||
1048 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1049 | { | |
1050 | dquot->dq_dqb.dqb_curspace += number; | |
1051 | } | |
1052 | ||
f18df228 MC |
1053 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1054 | { | |
1055 | dquot->dq_dqb.dqb_rsvspace += number; | |
1056 | } | |
1057 | ||
740d9dcd MC |
1058 | /* |
1059 | * Claim reserved quota space | |
1060 | */ | |
0a5a9c72 | 1061 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1062 | { |
0a5a9c72 JK |
1063 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1064 | WARN_ON_ONCE(1); | |
1065 | number = dquot->dq_dqb.dqb_rsvspace; | |
1066 | } | |
740d9dcd MC |
1067 | dquot->dq_dqb.dqb_curspace += number; |
1068 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1069 | } | |
1070 | ||
1071 | static inline | |
1072 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1073 | { | |
0a5a9c72 JK |
1074 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1075 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1076 | else { | |
1077 | WARN_ON_ONCE(1); | |
1078 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1079 | } | |
740d9dcd MC |
1080 | } |
1081 | ||
7a2435d8 | 1082 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1083 | { |
db49d2df JK |
1084 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1085 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1086 | dquot->dq_dqb.dqb_curinodes -= number; |
1087 | else | |
1088 | dquot->dq_dqb.dqb_curinodes = 0; | |
1089 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1090 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1091 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1092 | } | |
1093 | ||
7a2435d8 | 1094 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1095 | { |
db49d2df JK |
1096 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1097 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1098 | dquot->dq_dqb.dqb_curspace -= number; |
1099 | else | |
1100 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1101 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1102 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1103 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1104 | } | |
1105 | ||
c525460e JK |
1106 | static int warning_issued(struct dquot *dquot, const int warntype) |
1107 | { | |
1108 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1109 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1110 | ((warntype == QUOTA_NL_IHARDWARN || | |
1111 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1112 | ||
1113 | if (!flag) | |
1114 | return 0; | |
1115 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1116 | } | |
1117 | ||
8e893469 | 1118 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1119 | static int flag_print_warnings = 1; |
1120 | ||
7a2435d8 | 1121 | static int need_print_warning(struct dquot *dquot) |
1da177e4 LT |
1122 | { |
1123 | if (!flag_print_warnings) | |
1124 | return 0; | |
1125 | ||
1126 | switch (dquot->dq_type) { | |
1127 | case USRQUOTA: | |
da9592ed | 1128 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
1129 | case GRPQUOTA: |
1130 | return in_group_p(dquot->dq_id); | |
1131 | } | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1da177e4 | 1135 | /* Print warning to user which exceeded quota */ |
c525460e | 1136 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
1137 | { |
1138 | char *msg = NULL; | |
24ec839c | 1139 | struct tty_struct *tty; |
1da177e4 | 1140 | |
657d3bfa JK |
1141 | if (warntype == QUOTA_NL_IHARDBELOW || |
1142 | warntype == QUOTA_NL_ISOFTBELOW || | |
1143 | warntype == QUOTA_NL_BHARDBELOW || | |
1144 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1145 | return; |
1146 | ||
24ec839c PZ |
1147 | tty = get_current_tty(); |
1148 | if (!tty) | |
452a00d2 | 1149 | return; |
24ec839c | 1150 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1151 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1152 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1153 | else |
24ec839c PZ |
1154 | tty_write_message(tty, ": write failed, "); |
1155 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1156 | switch (warntype) { |
8e893469 | 1157 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1158 | msg = " file limit reached.\r\n"; |
1159 | break; | |
8e893469 | 1160 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1161 | msg = " file quota exceeded too long.\r\n"; |
1162 | break; | |
8e893469 | 1163 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1164 | msg = " file quota exceeded.\r\n"; |
1165 | break; | |
8e893469 | 1166 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1167 | msg = " block limit reached.\r\n"; |
1168 | break; | |
8e893469 | 1169 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1170 | msg = " block quota exceeded too long.\r\n"; |
1171 | break; | |
8e893469 | 1172 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1173 | msg = " block quota exceeded.\r\n"; |
1174 | break; | |
1175 | } | |
24ec839c | 1176 | tty_write_message(tty, msg); |
452a00d2 | 1177 | tty_kref_put(tty); |
1da177e4 | 1178 | } |
8e893469 JK |
1179 | #endif |
1180 | ||
f18df228 MC |
1181 | /* |
1182 | * Write warnings to the console and send warning messages over netlink. | |
1183 | * | |
1184 | * Note that this function can sleep. | |
1185 | */ | |
7a2435d8 | 1186 | static void flush_warnings(struct dquot *const *dquots, char *warntype) |
1da177e4 | 1187 | { |
86e931a3 | 1188 | struct dquot *dq; |
1da177e4 LT |
1189 | int i; |
1190 | ||
86e931a3 SW |
1191 | for (i = 0; i < MAXQUOTAS; i++) { |
1192 | dq = dquots[i]; | |
1193 | if (dq && warntype[i] != QUOTA_NL_NOWARN && | |
1194 | !warning_issued(dq, warntype[i])) { | |
8e893469 | 1195 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
86e931a3 | 1196 | print_warning(dq, warntype[i]); |
8e893469 | 1197 | #endif |
86e931a3 SW |
1198 | quota_send_warning(dq->dq_type, dq->dq_id, |
1199 | dq->dq_sb->s_dev, warntype[i]); | |
8e893469 | 1200 | } |
86e931a3 | 1201 | } |
1da177e4 LT |
1202 | } |
1203 | ||
7a2435d8 | 1204 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 LT |
1205 | { |
1206 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1207 | ||
1208 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1209 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1210 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | /* needs dq_data_lock */ | |
12095460 | 1214 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1215 | { |
268157ba JK |
1216 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1217 | ||
8e893469 | 1218 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1219 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1220 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
efd8f0e6 | 1221 | return 0; |
1da177e4 LT |
1222 | |
1223 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1224 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1225 | !ignore_hardlimit(dquot)) { |
8e893469 | 1226 | *warntype = QUOTA_NL_IHARDWARN; |
efd8f0e6 | 1227 | return -EDQUOT; |
1da177e4 LT |
1228 | } |
1229 | ||
1230 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1231 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1232 | dquot->dq_dqb.dqb_itime && | |
1233 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1234 | !ignore_hardlimit(dquot)) { |
8e893469 | 1235 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
efd8f0e6 | 1236 | return -EDQUOT; |
1da177e4 LT |
1237 | } |
1238 | ||
1239 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1240 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1241 | dquot->dq_dqb.dqb_itime == 0) { |
8e893469 | 1242 | *warntype = QUOTA_NL_ISOFTWARN; |
268157ba JK |
1243 | dquot->dq_dqb.dqb_itime = get_seconds() + |
1244 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; | |
1da177e4 LT |
1245 | } |
1246 | ||
efd8f0e6 | 1247 | return 0; |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | /* needs dq_data_lock */ | |
1251 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1252 | { | |
f18df228 | 1253 | qsize_t tspace; |
268157ba | 1254 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1255 | |
8e893469 | 1256 | *warntype = QUOTA_NL_NOWARN; |
268157ba | 1257 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || |
f55abc0f | 1258 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1259 | return 0; |
1da177e4 | 1260 | |
f18df228 MC |
1261 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1262 | + space; | |
1263 | ||
1da177e4 | 1264 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1265 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1266 | !ignore_hardlimit(dquot)) { |
1267 | if (!prealloc) | |
8e893469 | 1268 | *warntype = QUOTA_NL_BHARDWARN; |
efd8f0e6 | 1269 | return -EDQUOT; |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1273 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1274 | dquot->dq_dqb.dqb_btime && |
1275 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1276 | !ignore_hardlimit(dquot)) { |
1277 | if (!prealloc) | |
8e893469 | 1278 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
efd8f0e6 | 1279 | return -EDQUOT; |
1da177e4 LT |
1280 | } |
1281 | ||
1282 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1283 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1284 | dquot->dq_dqb.dqb_btime == 0) { |
1285 | if (!prealloc) { | |
8e893469 | 1286 | *warntype = QUOTA_NL_BSOFTWARN; |
268157ba JK |
1287 | dquot->dq_dqb.dqb_btime = get_seconds() + |
1288 | sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; | |
1da177e4 LT |
1289 | } |
1290 | else | |
1291 | /* | |
1292 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1293 | * be always printed | |
1294 | */ | |
efd8f0e6 | 1295 | return -EDQUOT; |
1da177e4 LT |
1296 | } |
1297 | ||
efd8f0e6 | 1298 | return 0; |
1da177e4 LT |
1299 | } |
1300 | ||
12095460 | 1301 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1302 | { |
268157ba JK |
1303 | qsize_t newinodes; |
1304 | ||
657d3bfa | 1305 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f JK |
1306 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1307 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1308 | return QUOTA_NL_NOWARN; |
1309 | ||
268157ba JK |
1310 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1311 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1312 | return QUOTA_NL_ISOFTBELOW; |
1313 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1314 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1315 | return QUOTA_NL_IHARDBELOW; |
1316 | return QUOTA_NL_NOWARN; | |
1317 | } | |
1318 | ||
1319 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1320 | { | |
1321 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1322 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1323 | return QUOTA_NL_NOWARN; |
1324 | ||
12095460 | 1325 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1326 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1327 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1328 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1329 | return QUOTA_NL_BHARDBELOW; |
1330 | return QUOTA_NL_NOWARN; | |
1331 | } | |
0a5a9c72 | 1332 | |
189eef59 CH |
1333 | static int dquot_active(const struct inode *inode) |
1334 | { | |
1335 | struct super_block *sb = inode->i_sb; | |
1336 | ||
1337 | if (IS_NOQUOTA(inode)) | |
1338 | return 0; | |
1339 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1340 | } | |
1341 | ||
1da177e4 | 1342 | /* |
871a2931 CH |
1343 | * Initialize quota pointers in inode |
1344 | * | |
1345 | * We do things in a bit complicated way but by that we avoid calling | |
1346 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1347 | * | |
1348 | * It is better to call this function outside of any transaction as it | |
1349 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1350 | */ |
871a2931 | 1351 | static void __dquot_initialize(struct inode *inode, int type) |
1da177e4 LT |
1352 | { |
1353 | unsigned int id = 0; | |
871a2931 | 1354 | int cnt; |
ad1e6e8d | 1355 | struct dquot *got[MAXQUOTAS]; |
cc33412f | 1356 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1357 | qsize_t rsv; |
1da177e4 | 1358 | |
d3be915f IM |
1359 | /* First test before acquiring mutex - solves deadlocks when we |
1360 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1361 | if (!dquot_active(inode)) |
871a2931 | 1362 | return; |
cc33412f JK |
1363 | |
1364 | /* First get references to structures we might need. */ | |
1365 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
ad1e6e8d | 1366 | got[cnt] = NULL; |
cc33412f JK |
1367 | if (type != -1 && cnt != type) |
1368 | continue; | |
1369 | switch (cnt) { | |
1370 | case USRQUOTA: | |
1371 | id = inode->i_uid; | |
1372 | break; | |
1373 | case GRPQUOTA: | |
1374 | id = inode->i_gid; | |
1375 | break; | |
1376 | } | |
1377 | got[cnt] = dqget(sb, id, cnt); | |
1378 | } | |
1379 | ||
1380 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1381 | if (IS_NOQUOTA(inode)) |
1382 | goto out_err; | |
1383 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1384 | if (type != -1 && cnt != type) | |
1385 | continue; | |
cc33412f JK |
1386 | /* Avoid races with quotaoff() */ |
1387 | if (!sb_has_quota_active(sb, cnt)) | |
1388 | continue; | |
dd6f3c6d | 1389 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1390 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1391 | got[cnt] = NULL; |
0a5a9c72 JK |
1392 | /* |
1393 | * Make quota reservation system happy if someone | |
1394 | * did a write before quota was turned on | |
1395 | */ | |
1396 | rsv = inode_get_rsv_space(inode); | |
1397 | if (unlikely(rsv)) | |
1398 | dquot_resv_space(inode->i_dquot[cnt], rsv); | |
1da177e4 LT |
1399 | } |
1400 | } | |
1401 | out_err: | |
cc33412f JK |
1402 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1403 | /* Drop unused references */ | |
dc52dd3a | 1404 | dqput_all(got); |
871a2931 CH |
1405 | } |
1406 | ||
1407 | void dquot_initialize(struct inode *inode) | |
1408 | { | |
1409 | __dquot_initialize(inode, -1); | |
1da177e4 | 1410 | } |
08d0350c | 1411 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1412 | |
1413 | /* | |
1414 | * Release all quotas referenced by inode | |
1da177e4 | 1415 | */ |
9f754758 | 1416 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1417 | { |
1418 | int cnt; | |
cc33412f | 1419 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1420 | |
cc33412f | 1421 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1422 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1423 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1424 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1425 | } |
1426 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1427 | dqput_all(put); |
1da177e4 LT |
1428 | } |
1429 | ||
9f754758 CH |
1430 | void dquot_drop(struct inode *inode) |
1431 | { | |
1432 | int cnt; | |
1433 | ||
1434 | if (IS_NOQUOTA(inode)) | |
1435 | return; | |
1436 | ||
1437 | /* | |
1438 | * Test before calling to rule out calls from proc and such | |
1439 | * where we are not allowed to block. Note that this is | |
1440 | * actually reliable test even without the lock - the caller | |
1441 | * must assure that nobody can come after the DQUOT_DROP and | |
1442 | * add quota pointers back anyway. | |
1443 | */ | |
1444 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1445 | if (inode->i_dquot[cnt]) | |
1446 | break; | |
1447 | } | |
1448 | ||
1449 | if (cnt < MAXQUOTAS) | |
1450 | __dquot_drop(inode); | |
1451 | } | |
1452 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1453 | |
fd8fbfc1 DM |
1454 | /* |
1455 | * inode_reserved_space is managed internally by quota, and protected by | |
1456 | * i_lock similar to i_blocks+i_bytes. | |
1457 | */ | |
1458 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1459 | { | |
1460 | /* Filesystem must explicitly define it's own method in order to use | |
1461 | * quota reservation interface */ | |
1462 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1463 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1464 | } | |
1465 | ||
c469070a | 1466 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1467 | { |
1468 | spin_lock(&inode->i_lock); | |
1469 | *inode_reserved_space(inode) += number; | |
1470 | spin_unlock(&inode->i_lock); | |
1471 | } | |
c469070a | 1472 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1473 | |
c469070a | 1474 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1475 | { |
1476 | spin_lock(&inode->i_lock); | |
1477 | *inode_reserved_space(inode) -= number; | |
1478 | __inode_add_bytes(inode, number); | |
1479 | spin_unlock(&inode->i_lock); | |
1480 | } | |
c469070a | 1481 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1482 | |
c469070a | 1483 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1484 | { |
1485 | spin_lock(&inode->i_lock); | |
1486 | *inode_reserved_space(inode) -= number; | |
1487 | spin_unlock(&inode->i_lock); | |
1488 | } | |
c469070a | 1489 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1490 | |
1491 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1492 | { | |
1493 | qsize_t ret; | |
05b5d898 JK |
1494 | |
1495 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1496 | return 0; | |
fd8fbfc1 DM |
1497 | spin_lock(&inode->i_lock); |
1498 | ret = *inode_reserved_space(inode); | |
1499 | spin_unlock(&inode->i_lock); | |
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1504 | int reserve) | |
1505 | { | |
1506 | if (reserve) | |
1507 | inode_add_rsv_space(inode, number); | |
1508 | else | |
1509 | inode_add_bytes(inode, number); | |
1510 | } | |
1511 | ||
1512 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1513 | { | |
1514 | if (reserve) | |
1515 | inode_sub_rsv_space(inode, number); | |
1516 | else | |
1517 | inode_sub_bytes(inode, number); | |
1518 | } | |
1519 | ||
1da177e4 | 1520 | /* |
5dd4056d CH |
1521 | * This functions updates i_blocks+i_bytes fields and quota information |
1522 | * (together with appropriate checks). | |
1523 | * | |
1524 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1525 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1526 | * the current transaction so that dquot write and inode write go into the | |
1527 | * same transaction. | |
1da177e4 LT |
1528 | */ |
1529 | ||
1530 | /* | |
1531 | * This operation can block, but only after everything is updated | |
1532 | */ | |
56246f9a | 1533 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1534 | { |
5dd4056d | 1535 | int cnt, ret = 0; |
1da177e4 | 1536 | char warntype[MAXQUOTAS]; |
56246f9a ES |
1537 | int warn = flags & DQUOT_SPACE_WARN; |
1538 | int reserve = flags & DQUOT_SPACE_RESERVE; | |
0e05842b | 1539 | int nofail = flags & DQUOT_SPACE_NOFAIL; |
1da177e4 | 1540 | |
fd8fbfc1 DM |
1541 | /* |
1542 | * First test before acquiring mutex - solves deadlocks when we | |
1543 | * re-enter the quota code and are already holding the mutex | |
1544 | */ | |
189eef59 | 1545 | if (!dquot_active(inode)) { |
fd8fbfc1 DM |
1546 | inode_incr_space(inode, number, reserve); |
1547 | goto out; | |
1548 | } | |
1549 | ||
1550 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1da177e4 | 1551 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1552 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1553 | |
1da177e4 LT |
1554 | spin_lock(&dq_data_lock); |
1555 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1556 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1557 | continue; |
efd8f0e6 CH |
1558 | ret = check_bdq(inode->i_dquot[cnt], number, !warn, |
1559 | warntype+cnt); | |
0e05842b | 1560 | if (ret && !nofail) { |
fd8fbfc1 DM |
1561 | spin_unlock(&dq_data_lock); |
1562 | goto out_flush_warn; | |
f18df228 | 1563 | } |
1da177e4 LT |
1564 | } |
1565 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1566 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1567 | continue; |
f18df228 MC |
1568 | if (reserve) |
1569 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1570 | else | |
1571 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1572 | } |
fd8fbfc1 | 1573 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1574 | spin_unlock(&dq_data_lock); |
f18df228 | 1575 | |
fd8fbfc1 DM |
1576 | if (reserve) |
1577 | goto out_flush_warn; | |
dc52dd3a | 1578 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 DM |
1579 | out_flush_warn: |
1580 | flush_warnings(inode->i_dquot, warntype); | |
1da177e4 | 1581 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1582 | out: |
1583 | return ret; | |
1584 | } | |
5dd4056d | 1585 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1586 | |
1587 | /* | |
1588 | * This operation can block, but only after everything is updated | |
1589 | */ | |
63936dda | 1590 | int dquot_alloc_inode(const struct inode *inode) |
1da177e4 | 1591 | { |
efd8f0e6 | 1592 | int cnt, ret = 0; |
1da177e4 LT |
1593 | char warntype[MAXQUOTAS]; |
1594 | ||
d3be915f IM |
1595 | /* First test before acquiring mutex - solves deadlocks when we |
1596 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1597 | if (!dquot_active(inode)) |
63936dda | 1598 | return 0; |
1da177e4 | 1599 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1600 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1601 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1602 | spin_lock(&dq_data_lock); |
1603 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1604 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1605 | continue; |
efd8f0e6 CH |
1606 | ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); |
1607 | if (ret) | |
1da177e4 LT |
1608 | goto warn_put_all; |
1609 | } | |
1610 | ||
1611 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1612 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1613 | continue; |
63936dda | 1614 | dquot_incr_inodes(inode->i_dquot[cnt], 1); |
1da177e4 | 1615 | } |
efd8f0e6 | 1616 | |
1da177e4 LT |
1617 | warn_put_all: |
1618 | spin_unlock(&dq_data_lock); | |
63936dda | 1619 | if (ret == 0) |
dc52dd3a | 1620 | mark_all_dquot_dirty(inode->i_dquot); |
087ee8d5 | 1621 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1622 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1623 | return ret; | |
1624 | } | |
08d0350c | 1625 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1626 | |
5dd4056d CH |
1627 | /* |
1628 | * Convert in-memory reserved quotas to real consumed quotas | |
1629 | */ | |
1630 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd MC |
1631 | { |
1632 | int cnt; | |
740d9dcd | 1633 | |
189eef59 | 1634 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1635 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1636 | return 0; |
740d9dcd MC |
1637 | } |
1638 | ||
1639 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
740d9dcd MC |
1640 | spin_lock(&dq_data_lock); |
1641 | /* Claim reserved quotas to allocated quotas */ | |
1642 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1643 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1644 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1645 | number); | |
1646 | } | |
1647 | /* Update inode bytes */ | |
fd8fbfc1 | 1648 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1649 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1650 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd | 1651 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
5dd4056d | 1652 | return 0; |
740d9dcd | 1653 | } |
5dd4056d | 1654 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1655 | |
1da177e4 LT |
1656 | /* |
1657 | * This operation can block, but only after everything is updated | |
1658 | */ | |
56246f9a | 1659 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1660 | { |
1661 | unsigned int cnt; | |
657d3bfa | 1662 | char warntype[MAXQUOTAS]; |
56246f9a | 1663 | int reserve = flags & DQUOT_SPACE_RESERVE; |
1da177e4 | 1664 | |
d3be915f IM |
1665 | /* First test before acquiring mutex - solves deadlocks when we |
1666 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1667 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1668 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1669 | return; |
1da177e4 | 1670 | } |
657d3bfa | 1671 | |
1da177e4 | 1672 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1673 | spin_lock(&dq_data_lock); |
1674 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1675 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1676 | continue; |
657d3bfa | 1677 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
fd8fbfc1 DM |
1678 | if (reserve) |
1679 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1680 | else | |
1681 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1682 | } |
fd8fbfc1 | 1683 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1684 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1685 | |
1686 | if (reserve) | |
1687 | goto out_unlock; | |
dc52dd3a | 1688 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 | 1689 | out_unlock: |
657d3bfa | 1690 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1691 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
fd8fbfc1 | 1692 | } |
5dd4056d | 1693 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1694 | |
1da177e4 LT |
1695 | /* |
1696 | * This operation can block, but only after everything is updated | |
1697 | */ | |
63936dda | 1698 | void dquot_free_inode(const struct inode *inode) |
1da177e4 LT |
1699 | { |
1700 | unsigned int cnt; | |
657d3bfa | 1701 | char warntype[MAXQUOTAS]; |
1da177e4 | 1702 | |
d3be915f IM |
1703 | /* First test before acquiring mutex - solves deadlocks when we |
1704 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1705 | if (!dquot_active(inode)) |
63936dda | 1706 | return; |
657d3bfa | 1707 | |
1da177e4 | 1708 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1709 | spin_lock(&dq_data_lock); |
1710 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1711 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1712 | continue; |
63936dda CH |
1713 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); |
1714 | dquot_decr_inodes(inode->i_dquot[cnt], 1); | |
1da177e4 LT |
1715 | } |
1716 | spin_unlock(&dq_data_lock); | |
dc52dd3a | 1717 | mark_all_dquot_dirty(inode->i_dquot); |
657d3bfa | 1718 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1719 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1720 | } |
08d0350c | 1721 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1722 | |
1723 | /* | |
1724 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1725 | * On success, dquot references in transfer_to are consumed and references |
1726 | * to original dquots that need to be released are placed there. On failure, | |
1727 | * references are kept untouched. | |
1da177e4 LT |
1728 | * |
1729 | * This operation can block, but only after everything is updated | |
1730 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1731 | * |
1da177e4 | 1732 | */ |
bc8e5f07 | 1733 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1734 | { |
740d9dcd MC |
1735 | qsize_t space, cur_space; |
1736 | qsize_t rsv_space = 0; | |
bc8e5f07 | 1737 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1738 | int cnt, ret = 0; |
9e32784b | 1739 | char is_valid[MAXQUOTAS] = {}; |
657d3bfa JK |
1740 | char warntype_to[MAXQUOTAS]; |
1741 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1742 | |
d3be915f IM |
1743 | /* First test before acquiring mutex - solves deadlocks when we |
1744 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 | 1745 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1746 | return 0; |
cc33412f | 1747 | /* Initialize the arrays */ |
bc8e5f07 | 1748 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
657d3bfa | 1749 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
cc33412f | 1750 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
cc33412f JK |
1751 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
1752 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
bc8e5f07 | 1753 | return 0; |
cc33412f | 1754 | } |
1da177e4 | 1755 | spin_lock(&dq_data_lock); |
740d9dcd | 1756 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1757 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1758 | space = cur_space + rsv_space; |
1da177e4 LT |
1759 | /* Build the transfer_from list and check the limits */ |
1760 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b D |
1761 | /* |
1762 | * Skip changes for same uid or gid or for turned off quota-type. | |
1763 | */ | |
dd6f3c6d | 1764 | if (!transfer_to[cnt]) |
1da177e4 | 1765 | continue; |
9e32784b D |
1766 | /* Avoid races with quotaoff() */ |
1767 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1768 | continue; | |
1769 | is_valid[cnt] = 1; | |
1da177e4 | 1770 | transfer_from[cnt] = inode->i_dquot[cnt]; |
efd8f0e6 CH |
1771 | ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); |
1772 | if (ret) | |
1773 | goto over_quota; | |
1774 | ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); | |
1775 | if (ret) | |
cc33412f | 1776 | goto over_quota; |
1da177e4 LT |
1777 | } |
1778 | ||
1779 | /* | |
1780 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1781 | */ | |
1782 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b | 1783 | if (!is_valid[cnt]) |
1da177e4 | 1784 | continue; |
1da177e4 LT |
1785 | /* Due to IO error we might not have transfer_from[] structure */ |
1786 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1787 | warntype_from_inodes[cnt] = |
1788 | info_idq_free(transfer_from[cnt], 1); | |
1789 | warntype_from_space[cnt] = | |
1790 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1791 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1792 | dquot_decr_space(transfer_from[cnt], cur_space); |
1793 | dquot_free_reserved_space(transfer_from[cnt], | |
1794 | rsv_space); | |
1da177e4 LT |
1795 | } |
1796 | ||
1797 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1798 | dquot_incr_space(transfer_to[cnt], cur_space); |
1799 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1800 | |
1801 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1802 | } | |
1da177e4 | 1803 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1804 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1805 | ||
dc52dd3a DM |
1806 | mark_all_dquot_dirty(transfer_from); |
1807 | mark_all_dquot_dirty(transfer_to); | |
86f3cbec JK |
1808 | flush_warnings(transfer_to, warntype_to); |
1809 | flush_warnings(transfer_from, warntype_from_inodes); | |
1810 | flush_warnings(transfer_from, warntype_from_space); | |
bc8e5f07 | 1811 | /* Pass back references to put */ |
dc52dd3a | 1812 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
1813 | if (is_valid[cnt]) |
1814 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 1815 | return 0; |
cc33412f JK |
1816 | over_quota: |
1817 | spin_unlock(&dq_data_lock); | |
1818 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
86f3cbec JK |
1819 | flush_warnings(transfer_to, warntype_to); |
1820 | return ret; | |
1da177e4 | 1821 | } |
bc8e5f07 | 1822 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 1823 | |
8ddd69d6 DM |
1824 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1825 | * Called from FSXXX_setattr() | |
1826 | */ | |
b43fa828 | 1827 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1828 | { |
bc8e5f07 JK |
1829 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
1830 | struct super_block *sb = inode->i_sb; | |
1831 | int ret; | |
8ddd69d6 | 1832 | |
189eef59 | 1833 | if (!dquot_active(inode)) |
bc8e5f07 | 1834 | return 0; |
12755627 | 1835 | |
bc8e5f07 JK |
1836 | if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) |
1837 | transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA); | |
1838 | if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) | |
4dea4969 | 1839 | transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA); |
bc8e5f07 JK |
1840 | |
1841 | ret = __dquot_transfer(inode, transfer_to); | |
1842 | dqput_all(transfer_to); | |
1843 | return ret; | |
b85f4b87 | 1844 | } |
b43fa828 | 1845 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 1846 | |
1da177e4 LT |
1847 | /* |
1848 | * Write info of quota file to disk | |
1849 | */ | |
1850 | int dquot_commit_info(struct super_block *sb, int type) | |
1851 | { | |
1852 | int ret; | |
1853 | struct quota_info *dqopt = sb_dqopt(sb); | |
1854 | ||
d3be915f | 1855 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1856 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1857 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1858 | return ret; |
1859 | } | |
08d0350c | 1860 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1861 | |
1862 | /* | |
1863 | * Definitions of diskquota operations. | |
1864 | */ | |
61e225dc | 1865 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1866 | .write_dquot = dquot_commit, |
1867 | .acquire_dquot = dquot_acquire, | |
1868 | .release_dquot = dquot_release, | |
1869 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1870 | .write_info = dquot_commit_info, |
1871 | .alloc_dquot = dquot_alloc, | |
1872 | .destroy_dquot = dquot_destroy, | |
1da177e4 | 1873 | }; |
123e9caf | 1874 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 1875 | |
907f4554 CH |
1876 | /* |
1877 | * Generic helper for ->open on filesystems supporting disk quotas. | |
1878 | */ | |
1879 | int dquot_file_open(struct inode *inode, struct file *file) | |
1880 | { | |
1881 | int error; | |
1882 | ||
1883 | error = generic_file_open(inode, file); | |
1884 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 1885 | dquot_initialize(inode); |
907f4554 CH |
1886 | return error; |
1887 | } | |
1888 | EXPORT_SYMBOL(dquot_file_open); | |
1889 | ||
1da177e4 LT |
1890 | /* |
1891 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1892 | */ | |
0f0dd62f | 1893 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1894 | { |
0ff5af83 | 1895 | int cnt, ret = 0; |
1da177e4 LT |
1896 | struct quota_info *dqopt = sb_dqopt(sb); |
1897 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1898 | |
f55abc0f JK |
1899 | /* Cannot turn off usage accounting without turning off limits, or |
1900 | * suspend quotas and simultaneously turn quotas off. */ | |
1901 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1902 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1903 | DQUOT_USAGE_ENABLED))) | |
1904 | return -EINVAL; | |
1905 | ||
1da177e4 | 1906 | /* We need to serialize quota_off() for device */ |
d3be915f | 1907 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1908 | |
1909 | /* | |
1910 | * Skip everything if there's nothing to do. We have to do this because | |
1911 | * sometimes we are called when fill_super() failed and calling | |
1912 | * sync_fs() in such cases does no good. | |
1913 | */ | |
f55abc0f | 1914 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1915 | mutex_unlock(&dqopt->dqonoff_mutex); |
1916 | return 0; | |
1917 | } | |
1da177e4 LT |
1918 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1919 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1920 | if (type != -1 && cnt != type) |
1921 | continue; | |
f55abc0f | 1922 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1923 | continue; |
f55abc0f JK |
1924 | |
1925 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1926 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1927 | dqopt->flags |= |
1928 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1929 | spin_unlock(&dq_state_lock); |
f55abc0f | 1930 | } else { |
cc33412f | 1931 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1932 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1933 | /* Turning off suspended quotas? */ | |
1934 | if (!sb_has_quota_loaded(sb, cnt) && | |
1935 | sb_has_quota_suspended(sb, cnt)) { | |
1936 | dqopt->flags &= ~dquot_state_flag( | |
1937 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1938 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1939 | iput(dqopt->files[cnt]); |
1940 | dqopt->files[cnt] = NULL; | |
1941 | continue; | |
1942 | } | |
cc33412f | 1943 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1944 | } |
f55abc0f JK |
1945 | |
1946 | /* We still have to keep quota loaded? */ | |
1947 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1948 | continue; |
1da177e4 LT |
1949 | |
1950 | /* Note: these are blocking operations */ | |
1951 | drop_dquot_ref(sb, cnt); | |
1952 | invalidate_dquots(sb, cnt); | |
1953 | /* | |
268157ba JK |
1954 | * Now all dquots should be invalidated, all writes done so we |
1955 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
1956 | */ |
1957 | if (info_dirty(&dqopt->info[cnt])) | |
1958 | sb->dq_op->write_info(sb, cnt); | |
1959 | if (dqopt->ops[cnt]->free_file_info) | |
1960 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1961 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1962 | ||
1963 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1964 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1965 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1966 | dqopt->info[cnt].dqi_flags = 0; |
1967 | dqopt->info[cnt].dqi_igrace = 0; | |
1968 | dqopt->info[cnt].dqi_bgrace = 0; | |
1969 | dqopt->ops[cnt] = NULL; | |
1970 | } | |
d3be915f | 1971 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1972 | |
1973 | /* Skip syncing and setting flags if quota files are hidden */ | |
1974 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1975 | goto put_inodes; | |
1976 | ||
1da177e4 | 1977 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1978 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1979 | if (sb->s_op->sync_fs) |
1980 | sb->s_op->sync_fs(sb, 1); | |
1981 | sync_blockdev(sb->s_bdev); | |
1982 | /* Now the quota files are just ordinary files and we can set the | |
1983 | * inode flags back. Moreover we discard the pagecache so that | |
1984 | * userspace sees the writes we did bypassing the pagecache. We | |
1985 | * must also discard the blockdev buffers so that we see the | |
1986 | * changes done by userspace on the next quotaon() */ | |
1987 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1988 | if (toputinode[cnt]) { | |
d3be915f | 1989 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1990 | /* If quota was reenabled in the meantime, we have |
1991 | * nothing to do */ | |
f55abc0f | 1992 | if (!sb_has_quota_loaded(sb, cnt)) { |
268157ba JK |
1993 | mutex_lock_nested(&toputinode[cnt]->i_mutex, |
1994 | I_MUTEX_QUOTA); | |
1da177e4 LT |
1995 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1996 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
1997 | truncate_inode_pages(&toputinode[cnt]->i_data, |
1998 | 0); | |
1b1dcc1b | 1999 | mutex_unlock(&toputinode[cnt]->i_mutex); |
43d2932d | 2000 | mark_inode_dirty_sync(toputinode[cnt]); |
1da177e4 | 2001 | } |
d3be915f | 2002 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2003 | } |
2004 | if (sb->s_bdev) | |
2005 | invalidate_bdev(sb->s_bdev); | |
2006 | put_inodes: | |
2007 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2008 | if (toputinode[cnt]) { | |
0ff5af83 | 2009 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2010 | * can reenable quota on the subsequent remount RW. We |
2011 | * have to check 'flags' variable and not use sb_has_ | |
2012 | * function because another quotaon / quotaoff could | |
2013 | * change global state before we got here. We refuse | |
2014 | * to suspend quotas when there is pending delete on | |
2015 | * the quota file... */ | |
2016 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2017 | iput(toputinode[cnt]); |
2018 | else if (!toputinode[cnt]->i_nlink) | |
2019 | ret = -EBUSY; | |
1da177e4 | 2020 | } |
0ff5af83 | 2021 | return ret; |
1da177e4 | 2022 | } |
0f0dd62f | 2023 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2024 | |
287a8095 | 2025 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2026 | { |
0f0dd62f CH |
2027 | return dquot_disable(sb, type, |
2028 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2029 | } |
287a8095 | 2030 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2031 | |
1da177e4 LT |
2032 | /* |
2033 | * Turn quotas on on a device | |
2034 | */ | |
2035 | ||
f55abc0f JK |
2036 | /* |
2037 | * Helper function to turn quotas on when we already have the inode of | |
2038 | * quota file and no quota information is loaded. | |
2039 | */ | |
2040 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2041 | unsigned int flags) | |
1da177e4 LT |
2042 | { |
2043 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2044 | struct super_block *sb = inode->i_sb; | |
2045 | struct quota_info *dqopt = sb_dqopt(sb); | |
2046 | int error; | |
2047 | int oldflags = -1; | |
2048 | ||
2049 | if (!fmt) | |
2050 | return -ESRCH; | |
2051 | if (!S_ISREG(inode->i_mode)) { | |
2052 | error = -EACCES; | |
2053 | goto out_fmt; | |
2054 | } | |
2055 | if (IS_RDONLY(inode)) { | |
2056 | error = -EROFS; | |
2057 | goto out_fmt; | |
2058 | } | |
2059 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
2060 | error = -EINVAL; | |
2061 | goto out_fmt; | |
2062 | } | |
f55abc0f JK |
2063 | /* Usage always has to be set... */ |
2064 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2065 | error = -EINVAL; | |
2066 | goto out_fmt; | |
2067 | } | |
1da177e4 | 2068 | |
ca785ec6 | 2069 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2070 | /* As we bypass the pagecache we must now flush all the |
2071 | * dirty data and invalidate caches so that kernel sees | |
2072 | * changes from userspace. It is not enough to just flush | |
2073 | * the quota file since if blocksize < pagesize, invalidation | |
2074 | * of the cache could fail because of other unrelated dirty | |
2075 | * data */ | |
2076 | sync_filesystem(sb); | |
ca785ec6 JK |
2077 | invalidate_bdev(sb->s_bdev); |
2078 | } | |
d3be915f | 2079 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2080 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2081 | error = -EBUSY; |
2082 | goto out_lock; | |
2083 | } | |
ca785ec6 JK |
2084 | |
2085 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2086 | /* We don't want quota and atime on quota files (deadlocks | |
2087 | * possible) Also nobody should write to the file - we use | |
2088 | * special IO operations which ignore the immutable bit. */ | |
dee86565 | 2089 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
268157ba JK |
2090 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2091 | S_NOQUOTA); | |
ca785ec6 | 2092 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2093 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
2094 | /* |
2095 | * When S_NOQUOTA is set, remove dquot references as no more | |
2096 | * references can be added | |
2097 | */ | |
9f754758 | 2098 | __dquot_drop(inode); |
ca785ec6 | 2099 | } |
1da177e4 LT |
2100 | |
2101 | error = -EIO; | |
2102 | dqopt->files[type] = igrab(inode); | |
2103 | if (!dqopt->files[type]) | |
2104 | goto out_lock; | |
2105 | error = -EINVAL; | |
2106 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2107 | goto out_file_init; | |
2108 | ||
2109 | dqopt->ops[type] = fmt->qf_ops; | |
2110 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2111 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2112 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2113 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2114 | error = dqopt->ops[type]->read_file_info(sb, type); |
2115 | if (error < 0) { | |
d3be915f | 2116 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2117 | goto out_file_init; |
2118 | } | |
d3be915f | 2119 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2120 | spin_lock(&dq_state_lock); |
f55abc0f | 2121 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2122 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2123 | |
2124 | add_dquot_ref(sb, type); | |
d3be915f | 2125 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2126 | |
2127 | return 0; | |
2128 | ||
2129 | out_file_init: | |
2130 | dqopt->files[type] = NULL; | |
2131 | iput(inode); | |
2132 | out_lock: | |
1da177e4 | 2133 | if (oldflags != -1) { |
dee86565 | 2134 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2135 | /* Set the flags back (in the case of accidental quotaon() |
2136 | * on a wrong file we don't want to mess up the flags) */ | |
2137 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2138 | inode->i_flags |= oldflags; | |
dee86565 | 2139 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2140 | } |
d01730d7 | 2141 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2142 | out_fmt: |
2143 | put_quota_format(fmt); | |
2144 | ||
2145 | return error; | |
2146 | } | |
2147 | ||
0ff5af83 | 2148 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2149 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2150 | { |
2151 | struct quota_info *dqopt = sb_dqopt(sb); | |
2152 | struct inode *inode; | |
0f0dd62f | 2153 | int ret = 0, cnt; |
f55abc0f | 2154 | unsigned int flags; |
0ff5af83 | 2155 | |
0f0dd62f CH |
2156 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2157 | if (type != -1 && cnt != type) | |
2158 | continue; | |
2159 | ||
2160 | mutex_lock(&dqopt->dqonoff_mutex); | |
2161 | if (!sb_has_quota_suspended(sb, cnt)) { | |
2162 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2163 | continue; | |
2164 | } | |
2165 | inode = dqopt->files[cnt]; | |
2166 | dqopt->files[cnt] = NULL; | |
2167 | spin_lock(&dq_state_lock); | |
2168 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2169 | DQUOT_LIMITS_ENABLED, | |
2170 | cnt); | |
2171 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2172 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2173 | mutex_unlock(&dqopt->dqonoff_mutex); |
0ff5af83 | 2174 | |
0f0dd62f CH |
2175 | flags = dquot_generic_flag(flags, cnt); |
2176 | ret = vfs_load_quota_inode(inode, cnt, | |
2177 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2178 | iput(inode); | |
2179 | } | |
0ff5af83 JK |
2180 | |
2181 | return ret; | |
2182 | } | |
0f0dd62f | 2183 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2184 | |
287a8095 | 2185 | int dquot_quota_on_path(struct super_block *sb, int type, int format_id, |
77e69dac AV |
2186 | struct path *path) |
2187 | { | |
2188 | int error = security_quota_on(path->dentry); | |
2189 | if (error) | |
2190 | return error; | |
2191 | /* Quota file not on the same filesystem? */ | |
2192 | if (path->mnt->mnt_sb != sb) | |
2193 | error = -EXDEV; | |
2194 | else | |
f55abc0f JK |
2195 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2196 | format_id, DQUOT_USAGE_ENABLED | | |
2197 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2198 | return error; |
2199 | } | |
287a8095 | 2200 | EXPORT_SYMBOL(dquot_quota_on_path); |
77e69dac | 2201 | |
287a8095 | 2202 | int dquot_quota_on(struct super_block *sb, int type, int format_id, char *name) |
1da177e4 | 2203 | { |
8264613d | 2204 | struct path path; |
1da177e4 LT |
2205 | int error; |
2206 | ||
8264613d | 2207 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2208 | if (!error) { |
287a8095 | 2209 | error = dquot_quota_on_path(sb, type, format_id, &path); |
8264613d | 2210 | path_put(&path); |
77e69dac | 2211 | } |
1da177e4 LT |
2212 | return error; |
2213 | } | |
287a8095 | 2214 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2215 | |
f55abc0f JK |
2216 | /* |
2217 | * More powerful function for turning on quotas allowing setting | |
2218 | * of individual quota flags | |
2219 | */ | |
287a8095 CH |
2220 | int dquot_enable(struct inode *inode, int type, int format_id, |
2221 | unsigned int flags) | |
f55abc0f JK |
2222 | { |
2223 | int ret = 0; | |
2224 | struct super_block *sb = inode->i_sb; | |
2225 | struct quota_info *dqopt = sb_dqopt(sb); | |
2226 | ||
2227 | /* Just unsuspend quotas? */ | |
0f0dd62f CH |
2228 | BUG_ON(flags & DQUOT_SUSPENDED); |
2229 | ||
f55abc0f JK |
2230 | if (!flags) |
2231 | return 0; | |
2232 | /* Just updating flags needed? */ | |
2233 | if (sb_has_quota_loaded(sb, type)) { | |
2234 | mutex_lock(&dqopt->dqonoff_mutex); | |
2235 | /* Now do a reliable test... */ | |
2236 | if (!sb_has_quota_loaded(sb, type)) { | |
2237 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2238 | goto load_quota; | |
2239 | } | |
2240 | if (flags & DQUOT_USAGE_ENABLED && | |
2241 | sb_has_quota_usage_enabled(sb, type)) { | |
2242 | ret = -EBUSY; | |
2243 | goto out_lock; | |
2244 | } | |
2245 | if (flags & DQUOT_LIMITS_ENABLED && | |
2246 | sb_has_quota_limits_enabled(sb, type)) { | |
2247 | ret = -EBUSY; | |
2248 | goto out_lock; | |
2249 | } | |
cc33412f | 2250 | spin_lock(&dq_state_lock); |
f55abc0f | 2251 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2252 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2253 | out_lock: |
2254 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2255 | return ret; | |
2256 | } | |
2257 | ||
2258 | load_quota: | |
2259 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2260 | } | |
287a8095 | 2261 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2262 | |
1da177e4 LT |
2263 | /* |
2264 | * This function is used when filesystem needs to initialize quotas | |
2265 | * during mount time. | |
2266 | */ | |
287a8095 | 2267 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2268 | int format_id, int type) |
1da177e4 | 2269 | { |
84de856e | 2270 | struct dentry *dentry; |
1da177e4 LT |
2271 | int error; |
2272 | ||
c56818d7 | 2273 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2274 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2275 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2276 | if (IS_ERR(dentry)) |
2277 | return PTR_ERR(dentry); | |
2278 | ||
154f484b JK |
2279 | if (!dentry->d_inode) { |
2280 | error = -ENOENT; | |
2281 | goto out; | |
2282 | } | |
2283 | ||
1da177e4 | 2284 | error = security_quota_on(dentry); |
84de856e | 2285 | if (!error) |
f55abc0f JK |
2286 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2287 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2288 | |
154f484b | 2289 | out: |
84de856e CH |
2290 | dput(dentry); |
2291 | return error; | |
1da177e4 | 2292 | } |
287a8095 | 2293 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2294 | |
12095460 JK |
2295 | static inline qsize_t qbtos(qsize_t blocks) |
2296 | { | |
2297 | return blocks << QIF_DQBLKSIZE_BITS; | |
2298 | } | |
2299 | ||
2300 | static inline qsize_t stoqb(qsize_t space) | |
2301 | { | |
2302 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2303 | } | |
2304 | ||
1da177e4 | 2305 | /* Generic routine for getting common part of quota structure */ |
b9b2dd36 | 2306 | static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2307 | { |
2308 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2309 | ||
b9b2dd36 CH |
2310 | memset(di, 0, sizeof(*di)); |
2311 | di->d_version = FS_DQUOT_VERSION; | |
2312 | di->d_flags = dquot->dq_type == USRQUOTA ? | |
ade7ce31 | 2313 | FS_USER_QUOTA : FS_GROUP_QUOTA; |
b9b2dd36 CH |
2314 | di->d_id = dquot->dq_id; |
2315 | ||
1da177e4 | 2316 | spin_lock(&dq_data_lock); |
b9b2dd36 CH |
2317 | di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); |
2318 | di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); | |
2319 | di->d_ino_hardlimit = dm->dqb_ihardlimit; | |
2320 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
2321 | di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; | |
2322 | di->d_icount = dm->dqb_curinodes; | |
2323 | di->d_btimer = dm->dqb_btime; | |
2324 | di->d_itimer = dm->dqb_itime; | |
1da177e4 LT |
2325 | spin_unlock(&dq_data_lock); |
2326 | } | |
2327 | ||
287a8095 CH |
2328 | int dquot_get_dqblk(struct super_block *sb, int type, qid_t id, |
2329 | struct fs_disk_quota *di) | |
1da177e4 LT |
2330 | { |
2331 | struct dquot *dquot; | |
2332 | ||
cc33412f | 2333 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2334 | if (!dquot) |
1da177e4 | 2335 | return -ESRCH; |
1da177e4 LT |
2336 | do_get_dqblk(dquot, di); |
2337 | dqput(dquot); | |
cc33412f | 2338 | |
1da177e4 LT |
2339 | return 0; |
2340 | } | |
287a8095 | 2341 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2342 | |
c472b432 CH |
2343 | #define VFS_FS_DQ_MASK \ |
2344 | (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ | |
2345 | FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ | |
2346 | FS_DQ_BTIMER | FS_DQ_ITIMER) | |
2347 | ||
1da177e4 | 2348 | /* Generic routine for setting common part of quota structure */ |
c472b432 | 2349 | static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2350 | { |
2351 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2352 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2353 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2354 | ||
c472b432 CH |
2355 | if (di->d_fieldmask & ~VFS_FS_DQ_MASK) |
2356 | return -EINVAL; | |
2357 | ||
2358 | if (((di->d_fieldmask & FS_DQ_BSOFT) && | |
2359 | (di->d_blk_softlimit > dqi->dqi_maxblimit)) || | |
2360 | ((di->d_fieldmask & FS_DQ_BHARD) && | |
2361 | (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || | |
2362 | ((di->d_fieldmask & FS_DQ_ISOFT) && | |
2363 | (di->d_ino_softlimit > dqi->dqi_maxilimit)) || | |
2364 | ((di->d_fieldmask & FS_DQ_IHARD) && | |
2365 | (di->d_ino_hardlimit > dqi->dqi_maxilimit))) | |
338bf9af | 2366 | return -ERANGE; |
1da177e4 LT |
2367 | |
2368 | spin_lock(&dq_data_lock); | |
c472b432 CH |
2369 | if (di->d_fieldmask & FS_DQ_BCOUNT) { |
2370 | dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; | |
1da177e4 | 2371 | check_blim = 1; |
08261673 | 2372 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2373 | } |
c472b432 CH |
2374 | |
2375 | if (di->d_fieldmask & FS_DQ_BSOFT) | |
2376 | dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); | |
2377 | if (di->d_fieldmask & FS_DQ_BHARD) | |
2378 | dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); | |
2379 | if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { | |
1da177e4 | 2380 | check_blim = 1; |
08261673 | 2381 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2382 | } |
c472b432 CH |
2383 | |
2384 | if (di->d_fieldmask & FS_DQ_ICOUNT) { | |
2385 | dm->dqb_curinodes = di->d_icount; | |
1da177e4 | 2386 | check_ilim = 1; |
08261673 | 2387 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2388 | } |
c472b432 CH |
2389 | |
2390 | if (di->d_fieldmask & FS_DQ_ISOFT) | |
2391 | dm->dqb_isoftlimit = di->d_ino_softlimit; | |
2392 | if (di->d_fieldmask & FS_DQ_IHARD) | |
2393 | dm->dqb_ihardlimit = di->d_ino_hardlimit; | |
2394 | if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { | |
1da177e4 | 2395 | check_ilim = 1; |
08261673 | 2396 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2397 | } |
c472b432 CH |
2398 | |
2399 | if (di->d_fieldmask & FS_DQ_BTIMER) { | |
2400 | dm->dqb_btime = di->d_btimer; | |
e04a88a9 | 2401 | check_blim = 1; |
08261673 | 2402 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2403 | } |
c472b432 CH |
2404 | |
2405 | if (di->d_fieldmask & FS_DQ_ITIMER) { | |
2406 | dm->dqb_itime = di->d_itimer; | |
e04a88a9 | 2407 | check_ilim = 1; |
08261673 | 2408 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2409 | } |
1da177e4 LT |
2410 | |
2411 | if (check_blim) { | |
268157ba JK |
2412 | if (!dm->dqb_bsoftlimit || |
2413 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2414 | dm->dqb_btime = 0; |
2415 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
c472b432 | 2416 | } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) |
268157ba | 2417 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2418 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2419 | } |
2420 | if (check_ilim) { | |
268157ba JK |
2421 | if (!dm->dqb_isoftlimit || |
2422 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2423 | dm->dqb_itime = 0; |
2424 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
c472b432 | 2425 | } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) |
268157ba | 2426 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2427 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2428 | } |
268157ba JK |
2429 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2430 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2431 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2432 | else | |
2433 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2434 | spin_unlock(&dq_data_lock); | |
2435 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2436 | |
2437 | return 0; | |
1da177e4 LT |
2438 | } |
2439 | ||
287a8095 | 2440 | int dquot_set_dqblk(struct super_block *sb, int type, qid_t id, |
c472b432 | 2441 | struct fs_disk_quota *di) |
1da177e4 LT |
2442 | { |
2443 | struct dquot *dquot; | |
338bf9af | 2444 | int rc; |
1da177e4 | 2445 | |
f55abc0f JK |
2446 | dquot = dqget(sb, id, type); |
2447 | if (!dquot) { | |
2448 | rc = -ESRCH; | |
2449 | goto out; | |
1da177e4 | 2450 | } |
338bf9af | 2451 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2452 | dqput(dquot); |
f55abc0f | 2453 | out: |
338bf9af | 2454 | return rc; |
1da177e4 | 2455 | } |
287a8095 | 2456 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2457 | |
2458 | /* Generic routine for getting common part of quota file information */ | |
287a8095 | 2459 | int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) |
1da177e4 LT |
2460 | { |
2461 | struct mem_dqinfo *mi; | |
2462 | ||
d3be915f | 2463 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2464 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2465 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2466 | return -ESRCH; |
2467 | } | |
2468 | mi = sb_dqopt(sb)->info + type; | |
2469 | spin_lock(&dq_data_lock); | |
2470 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2471 | ii->dqi_igrace = mi->dqi_igrace; | |
2472 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2473 | ii->dqi_valid = IIF_ALL; | |
2474 | spin_unlock(&dq_data_lock); | |
d3be915f | 2475 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2476 | return 0; |
2477 | } | |
287a8095 | 2478 | EXPORT_SYMBOL(dquot_get_dqinfo); |
1da177e4 LT |
2479 | |
2480 | /* Generic routine for setting common part of quota file information */ | |
287a8095 | 2481 | int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) |
1da177e4 LT |
2482 | { |
2483 | struct mem_dqinfo *mi; | |
f55abc0f | 2484 | int err = 0; |
1da177e4 | 2485 | |
d3be915f | 2486 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2487 | if (!sb_has_quota_active(sb, type)) { |
2488 | err = -ESRCH; | |
2489 | goto out; | |
1da177e4 LT |
2490 | } |
2491 | mi = sb_dqopt(sb)->info + type; | |
2492 | spin_lock(&dq_data_lock); | |
2493 | if (ii->dqi_valid & IIF_BGRACE) | |
2494 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2495 | if (ii->dqi_valid & IIF_IGRACE) | |
2496 | mi->dqi_igrace = ii->dqi_igrace; | |
2497 | if (ii->dqi_valid & IIF_FLAGS) | |
268157ba JK |
2498 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | |
2499 | (ii->dqi_flags & DQF_MASK); | |
1da177e4 LT |
2500 | spin_unlock(&dq_data_lock); |
2501 | mark_info_dirty(sb, type); | |
2502 | /* Force write to disk */ | |
2503 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2504 | out: |
d3be915f | 2505 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2506 | return err; |
1da177e4 | 2507 | } |
287a8095 | 2508 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2509 | |
287a8095 CH |
2510 | const struct quotactl_ops dquot_quotactl_ops = { |
2511 | .quota_on = dquot_quota_on, | |
2512 | .quota_off = dquot_quota_off, | |
2513 | .quota_sync = dquot_quota_sync, | |
2514 | .get_info = dquot_get_dqinfo, | |
2515 | .set_info = dquot_set_dqinfo, | |
2516 | .get_dqblk = dquot_get_dqblk, | |
2517 | .set_dqblk = dquot_set_dqblk | |
1da177e4 | 2518 | }; |
287a8095 | 2519 | EXPORT_SYMBOL(dquot_quotactl_ops); |
dde95888 DM |
2520 | |
2521 | static int do_proc_dqstats(struct ctl_table *table, int write, | |
2522 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2523 | { | |
dde95888 | 2524 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2525 | |
2526 | /* Update global table */ | |
2527 | dqstats.stat[type] = | |
2528 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2529 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2530 | } | |
2531 | ||
1da177e4 LT |
2532 | static ctl_table fs_dqstats_table[] = { |
2533 | { | |
1da177e4 | 2534 | .procname = "lookups", |
dde95888 | 2535 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2536 | .maxlen = sizeof(int), |
2537 | .mode = 0444, | |
dde95888 | 2538 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2539 | }, |
2540 | { | |
1da177e4 | 2541 | .procname = "drops", |
dde95888 | 2542 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2543 | .maxlen = sizeof(int), |
2544 | .mode = 0444, | |
dde95888 | 2545 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2546 | }, |
2547 | { | |
1da177e4 | 2548 | .procname = "reads", |
dde95888 | 2549 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2550 | .maxlen = sizeof(int), |
2551 | .mode = 0444, | |
dde95888 | 2552 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2553 | }, |
2554 | { | |
1da177e4 | 2555 | .procname = "writes", |
dde95888 | 2556 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2557 | .maxlen = sizeof(int), |
2558 | .mode = 0444, | |
dde95888 | 2559 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2560 | }, |
2561 | { | |
1da177e4 | 2562 | .procname = "cache_hits", |
dde95888 | 2563 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2564 | .maxlen = sizeof(int), |
2565 | .mode = 0444, | |
dde95888 | 2566 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2567 | }, |
2568 | { | |
1da177e4 | 2569 | .procname = "allocated_dquots", |
dde95888 | 2570 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2571 | .maxlen = sizeof(int), |
2572 | .mode = 0444, | |
dde95888 | 2573 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2574 | }, |
2575 | { | |
1da177e4 | 2576 | .procname = "free_dquots", |
dde95888 | 2577 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2578 | .maxlen = sizeof(int), |
2579 | .mode = 0444, | |
dde95888 | 2580 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2581 | }, |
2582 | { | |
1da177e4 | 2583 | .procname = "syncs", |
dde95888 | 2584 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2585 | .maxlen = sizeof(int), |
2586 | .mode = 0444, | |
dde95888 | 2587 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2588 | }, |
8e893469 | 2589 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2590 | { |
1da177e4 LT |
2591 | .procname = "warnings", |
2592 | .data = &flag_print_warnings, | |
2593 | .maxlen = sizeof(int), | |
2594 | .mode = 0644, | |
6d456111 | 2595 | .proc_handler = proc_dointvec, |
1da177e4 | 2596 | }, |
8e893469 | 2597 | #endif |
ab09203e | 2598 | { }, |
1da177e4 LT |
2599 | }; |
2600 | ||
2601 | static ctl_table fs_table[] = { | |
2602 | { | |
1da177e4 LT |
2603 | .procname = "quota", |
2604 | .mode = 0555, | |
2605 | .child = fs_dqstats_table, | |
2606 | }, | |
ab09203e | 2607 | { }, |
1da177e4 LT |
2608 | }; |
2609 | ||
2610 | static ctl_table sys_table[] = { | |
2611 | { | |
1da177e4 LT |
2612 | .procname = "fs", |
2613 | .mode = 0555, | |
2614 | .child = fs_table, | |
2615 | }, | |
ab09203e | 2616 | { }, |
1da177e4 LT |
2617 | }; |
2618 | ||
2619 | static int __init dquot_init(void) | |
2620 | { | |
f32764bd | 2621 | int i, ret; |
1da177e4 LT |
2622 | unsigned long nr_hash, order; |
2623 | ||
2624 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2625 | ||
0b4d4147 | 2626 | register_sysctl_table(sys_table); |
1da177e4 | 2627 | |
20c2df83 | 2628 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2629 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2630 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2631 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2632 | NULL); |
1da177e4 LT |
2633 | |
2634 | order = 0; | |
2635 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2636 | if (!dquot_hash) | |
2637 | panic("Cannot create dquot hash table"); | |
2638 | ||
f32764bd DM |
2639 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
2640 | ret = percpu_counter_init(&dqstats.counter[i], 0); | |
2641 | if (ret) | |
2642 | panic("Cannot create dquot stat counters"); | |
2643 | } | |
dde95888 | 2644 | |
1da177e4 LT |
2645 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2646 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2647 | dq_hash_bits = 0; | |
2648 | do { | |
2649 | dq_hash_bits++; | |
2650 | } while (nr_hash >> dq_hash_bits); | |
2651 | dq_hash_bits--; | |
2652 | ||
2653 | nr_hash = 1UL << dq_hash_bits; | |
2654 | dq_hash_mask = nr_hash - 1; | |
2655 | for (i = 0; i < nr_hash; i++) | |
2656 | INIT_HLIST_HEAD(dquot_hash + i); | |
2657 | ||
2658 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2659 | nr_hash, order, (PAGE_SIZE << order)); | |
2660 | ||
8e1f936b | 2661 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2662 | |
2663 | return 0; | |
2664 | } | |
2665 | module_init(dquot_init); |