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> | |
40401530 | 74 | #include <linux/sched.h> |
1da177e4 LT |
75 | #include <linux/kmod.h> |
76 | #include <linux/namei.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
55fa6091 | 79 | #include "../internal.h" /* ugh */ |
1da177e4 | 80 | |
f3da9310 | 81 | #include <linux/uaccess.h> |
1da177e4 | 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: | |
a80b12c3 | 119 | * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock > |
d3be915f | 120 | * dqio_mutex |
a80b12c3 | 121 | * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc. |
cc33412f JK |
122 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
123 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
124 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
125 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
126 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
127 | * called with dqptr_sem held. | |
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 | 135 | void __quota_error(struct super_block *sb, const char *func, |
055adcbd | 136 | const char *fmt, ...) |
fb5ffb0e | 137 | { |
fb5ffb0e | 138 | if (printk_ratelimit()) { |
055adcbd JP |
139 | va_list args; |
140 | struct va_format vaf; | |
141 | ||
fb5ffb0e | 142 | va_start(args, fmt); |
055adcbd JP |
143 | |
144 | vaf.fmt = fmt; | |
145 | vaf.va = &args; | |
146 | ||
147 | printk(KERN_ERR "Quota error (device %s): %s: %pV\n", | |
148 | sb->s_id, func, &vaf); | |
149 | ||
fb5ffb0e JZ |
150 | va_end(args); |
151 | } | |
152 | } | |
153 | EXPORT_SYMBOL(__quota_error); | |
154 | ||
da8d1ba2 | 155 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 156 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 157 | #endif |
1da177e4 LT |
158 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
159 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
160 | ||
161 | /* SLAB cache for dquot structures */ | |
e18b890b | 162 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
163 | |
164 | int register_quota_format(struct quota_format_type *fmt) | |
165 | { | |
166 | spin_lock(&dq_list_lock); | |
167 | fmt->qf_next = quota_formats; | |
168 | quota_formats = fmt; | |
169 | spin_unlock(&dq_list_lock); | |
170 | return 0; | |
171 | } | |
08d0350c | 172 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
173 | |
174 | void unregister_quota_format(struct quota_format_type *fmt) | |
175 | { | |
176 | struct quota_format_type **actqf; | |
177 | ||
178 | spin_lock(&dq_list_lock); | |
268157ba JK |
179 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
180 | actqf = &(*actqf)->qf_next) | |
181 | ; | |
1da177e4 LT |
182 | if (*actqf) |
183 | *actqf = (*actqf)->qf_next; | |
184 | spin_unlock(&dq_list_lock); | |
185 | } | |
08d0350c | 186 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
187 | |
188 | static struct quota_format_type *find_quota_format(int id) | |
189 | { | |
190 | struct quota_format_type *actqf; | |
191 | ||
192 | spin_lock(&dq_list_lock); | |
268157ba JK |
193 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
194 | actqf = actqf->qf_next) | |
195 | ; | |
1da177e4 LT |
196 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
197 | int qm; | |
198 | ||
199 | spin_unlock(&dq_list_lock); | |
200 | ||
268157ba JK |
201 | for (qm = 0; module_names[qm].qm_fmt_id && |
202 | module_names[qm].qm_fmt_id != id; qm++) | |
203 | ; | |
204 | if (!module_names[qm].qm_fmt_id || | |
205 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
206 | return NULL; |
207 | ||
208 | spin_lock(&dq_list_lock); | |
268157ba JK |
209 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
210 | actqf = actqf->qf_next) | |
211 | ; | |
1da177e4 LT |
212 | if (actqf && !try_module_get(actqf->qf_owner)) |
213 | actqf = NULL; | |
214 | } | |
215 | spin_unlock(&dq_list_lock); | |
216 | return actqf; | |
217 | } | |
218 | ||
219 | static void put_quota_format(struct quota_format_type *fmt) | |
220 | { | |
221 | module_put(fmt->qf_owner); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Dquot List Management: | |
226 | * The quota code uses three lists for dquot management: the inuse_list, | |
227 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
228 | * on all three lists, depending on its current state. | |
229 | * | |
230 | * All dquots are placed to the end of inuse_list when first created, and this | |
231 | * list is used for invalidate operation, which must look at every dquot. | |
232 | * | |
233 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
234 | * and this list is searched whenever we need an available dquot. Dquots are | |
235 | * removed from the list as soon as they are used again, and | |
236 | * dqstats.free_dquots gives the number of dquots on the list. When | |
237 | * dquot is invalidated it's completely released from memory. | |
238 | * | |
239 | * Dquots with a specific identity (device, type and id) are placed on | |
240 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
241 | * mechanism to locate a specific dquot. | |
242 | */ | |
243 | ||
244 | static LIST_HEAD(inuse_list); | |
245 | static LIST_HEAD(free_dquots); | |
246 | static unsigned int dq_hash_bits, dq_hash_mask; | |
247 | static struct hlist_head *dquot_hash; | |
248 | ||
249 | struct dqstats dqstats; | |
08d0350c | 250 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 251 | |
0a5a9c72 | 252 | static qsize_t inode_get_rsv_space(struct inode *inode); |
871a2931 | 253 | static void __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 254 | |
1da177e4 | 255 | static inline unsigned int |
1a06d420 | 256 | hashfn(const struct super_block *sb, struct kqid qid) |
1da177e4 | 257 | { |
1a06d420 EB |
258 | unsigned int id = from_kqid(&init_user_ns, qid); |
259 | int type = qid.type; | |
1da177e4 LT |
260 | unsigned long tmp; |
261 | ||
262 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
263 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Following list functions expect dq_list_lock to be held | |
268 | */ | |
269 | static inline void insert_dquot_hash(struct dquot *dquot) | |
270 | { | |
268157ba | 271 | struct hlist_head *head; |
1a06d420 | 272 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); |
1da177e4 LT |
273 | hlist_add_head(&dquot->dq_hash, head); |
274 | } | |
275 | ||
276 | static inline void remove_dquot_hash(struct dquot *dquot) | |
277 | { | |
278 | hlist_del_init(&dquot->dq_hash); | |
279 | } | |
280 | ||
7a2435d8 | 281 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
1a06d420 | 282 | struct kqid qid) |
1da177e4 LT |
283 | { |
284 | struct hlist_node *node; | |
285 | struct dquot *dquot; | |
286 | ||
287 | hlist_for_each (node, dquot_hash+hashent) { | |
288 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
4c376dca | 289 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 LT |
290 | return dquot; |
291 | } | |
dd6f3c6d | 292 | return NULL; |
1da177e4 LT |
293 | } |
294 | ||
295 | /* Add a dquot to the tail of the free list */ | |
296 | static inline void put_dquot_last(struct dquot *dquot) | |
297 | { | |
8e13059a | 298 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 299 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
300 | } |
301 | ||
302 | static inline void remove_free_dquot(struct dquot *dquot) | |
303 | { | |
304 | if (list_empty(&dquot->dq_free)) | |
305 | return; | |
306 | list_del_init(&dquot->dq_free); | |
dde95888 | 307 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
308 | } |
309 | ||
310 | static inline void put_inuse(struct dquot *dquot) | |
311 | { | |
312 | /* We add to the back of inuse list so we don't have to restart | |
313 | * when traversing this list and we block */ | |
8e13059a | 314 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 315 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
316 | } |
317 | ||
318 | static inline void remove_inuse(struct dquot *dquot) | |
319 | { | |
dde95888 | 320 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
321 | list_del(&dquot->dq_inuse); |
322 | } | |
323 | /* | |
324 | * End of list functions needing dq_list_lock | |
325 | */ | |
326 | ||
327 | static void wait_on_dquot(struct dquot *dquot) | |
328 | { | |
d3be915f IM |
329 | mutex_lock(&dquot->dq_lock); |
330 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
331 | } |
332 | ||
03f6e92b JK |
333 | static inline int dquot_dirty(struct dquot *dquot) |
334 | { | |
335 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
336 | } | |
337 | ||
338 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
339 | { | |
340 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
341 | } | |
1da177e4 | 342 | |
eabf290d | 343 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
344 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
345 | { | |
eabf290d DM |
346 | int ret = 1; |
347 | ||
348 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ | |
349 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
350 | return 1; | |
351 | ||
1da177e4 | 352 | spin_lock(&dq_list_lock); |
eabf290d | 353 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 354 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 355 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
356 | ret = 0; |
357 | } | |
1da177e4 | 358 | spin_unlock(&dq_list_lock); |
eabf290d | 359 | return ret; |
1da177e4 | 360 | } |
08d0350c | 361 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 362 | |
dc52dd3a DM |
363 | /* Dirtify all the dquots - this can block when journalling */ |
364 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
365 | { | |
366 | int ret, err, cnt; | |
367 | ||
368 | ret = err = 0; | |
369 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
370 | if (dquot[cnt]) | |
371 | /* Even in case of error we have to continue */ | |
372 | ret = mark_dquot_dirty(dquot[cnt]); | |
373 | if (!err) | |
374 | err = ret; | |
375 | } | |
376 | return err; | |
377 | } | |
378 | ||
379 | static inline void dqput_all(struct dquot **dquot) | |
380 | { | |
381 | unsigned int cnt; | |
382 | ||
383 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
384 | dqput(dquot[cnt]); | |
385 | } | |
386 | ||
1da177e4 LT |
387 | /* This function needs dq_list_lock */ |
388 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
389 | { | |
390 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
391 | return 0; | |
392 | list_del_init(&dquot->dq_dirty); | |
393 | return 1; | |
394 | } | |
395 | ||
396 | void mark_info_dirty(struct super_block *sb, int type) | |
397 | { | |
398 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
399 | } | |
400 | EXPORT_SYMBOL(mark_info_dirty); | |
401 | ||
402 | /* | |
403 | * Read dquot from disk and alloc space for it | |
404 | */ | |
405 | ||
406 | int dquot_acquire(struct dquot *dquot) | |
407 | { | |
408 | int ret = 0, ret2 = 0; | |
409 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
410 | ||
d3be915f IM |
411 | mutex_lock(&dquot->dq_lock); |
412 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 | 413 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
4c376dca | 414 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
1da177e4 LT |
415 | if (ret < 0) |
416 | goto out_iolock; | |
417 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
418 | /* Instantiate dquot if needed */ | |
419 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 420 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 421 | /* Write the info if needed */ |
4c376dca EB |
422 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
423 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
424 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 425 | } |
1da177e4 LT |
426 | if (ret < 0) |
427 | goto out_iolock; | |
428 | if (ret2 < 0) { | |
429 | ret = ret2; | |
430 | goto out_iolock; | |
431 | } | |
432 | } | |
433 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
434 | out_iolock: | |
d3be915f IM |
435 | mutex_unlock(&dqopt->dqio_mutex); |
436 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
437 | return ret; |
438 | } | |
08d0350c | 439 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
440 | |
441 | /* | |
442 | * Write dquot to disk | |
443 | */ | |
444 | int dquot_commit(struct dquot *dquot) | |
445 | { | |
b03f2456 | 446 | int ret = 0; |
1da177e4 LT |
447 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
448 | ||
d3be915f | 449 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
450 | spin_lock(&dq_list_lock); |
451 | if (!clear_dquot_dirty(dquot)) { | |
452 | spin_unlock(&dq_list_lock); | |
453 | goto out_sem; | |
454 | } | |
455 | spin_unlock(&dq_list_lock); | |
456 | /* Inactive dquot can be only if there was error during read/init | |
457 | * => we have better not writing it */ | |
b03f2456 | 458 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 459 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
460 | else |
461 | ret = -EIO; | |
1da177e4 | 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); |
4c376dca EB |
481 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
482 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 483 | /* Write the info */ |
4c376dca EB |
484 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
485 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
486 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 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; | |
4c376dca | 525 | if (dquot->dq_id.type != type) |
1da177e4 | 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 | |
ceed1723 JK |
599 | /* Write all dquot structures to quota files */ |
600 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
601 | { |
602 | struct list_head *dirty; | |
603 | struct dquot *dquot; | |
604 | struct quota_info *dqopt = sb_dqopt(sb); | |
605 | int cnt; | |
ceed1723 | 606 | int err, ret = 0; |
1da177e4 | 607 | |
d3be915f | 608 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
609 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
610 | if (type != -1 && cnt != type) | |
611 | continue; | |
f55abc0f | 612 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
613 | continue; |
614 | spin_lock(&dq_list_lock); | |
615 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
616 | while (!list_empty(dirty)) { | |
268157ba JK |
617 | dquot = list_first_entry(dirty, struct dquot, |
618 | dq_dirty); | |
1da177e4 LT |
619 | /* Dirty and inactive can be only bad dquot... */ |
620 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
621 | clear_dquot_dirty(dquot); | |
622 | continue; | |
623 | } | |
624 | /* Now we have active dquot from which someone is | |
625 | * holding reference so we can safely just increase | |
626 | * use count */ | |
627 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 628 | spin_unlock(&dq_list_lock); |
dde95888 | 629 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 JK |
630 | err = sb->dq_op->write_dquot(dquot); |
631 | if (!ret && err) | |
632 | err = ret; | |
1da177e4 LT |
633 | dqput(dquot); |
634 | spin_lock(&dq_list_lock); | |
635 | } | |
636 | spin_unlock(&dq_list_lock); | |
637 | } | |
638 | ||
639 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
640 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
641 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 642 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 643 | dqstats_inc(DQST_SYNCS); |
d3be915f | 644 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 645 | |
ceed1723 JK |
646 | return ret; |
647 | } | |
648 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
649 | ||
650 | /* Write all dquot structures to disk and make them visible from userspace */ | |
651 | int dquot_quota_sync(struct super_block *sb, int type) | |
652 | { | |
653 | struct quota_info *dqopt = sb_dqopt(sb); | |
654 | int cnt; | |
655 | int ret; | |
656 | ||
657 | ret = dquot_writeback_dquots(sb, type); | |
658 | if (ret) | |
659 | return ret; | |
660 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
661 | return 0; |
662 | ||
663 | /* This is not very clever (and fast) but currently I don't know about | |
664 | * any other simple way of getting quota data to disk and we must get | |
665 | * them there for userspace to be visible... */ | |
666 | if (sb->s_op->sync_fs) | |
667 | sb->s_op->sync_fs(sb, 1); | |
668 | sync_blockdev(sb->s_bdev); | |
669 | ||
670 | /* | |
671 | * Now when everything is written we can discard the pagecache so | |
672 | * that userspace sees the changes. | |
673 | */ | |
f9ef1784 | 674 | mutex_lock(&dqopt->dqonoff_mutex); |
5fb324ad CH |
675 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
676 | if (type != -1 && cnt != type) | |
677 | continue; | |
678 | if (!sb_has_quota_active(sb, cnt)) | |
679 | continue; | |
a80b12c3 | 680 | mutex_lock(&dqopt->files[cnt]->i_mutex); |
f9ef1784 JK |
681 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
682 | mutex_unlock(&dqopt->files[cnt]->i_mutex); | |
5fb324ad | 683 | } |
f9ef1784 | 684 | mutex_unlock(&dqopt->dqonoff_mutex); |
5fb324ad | 685 | |
1da177e4 LT |
686 | return 0; |
687 | } | |
287a8095 | 688 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 LT |
689 | |
690 | /* Free unused dquots from cache */ | |
691 | static void prune_dqcache(int count) | |
692 | { | |
693 | struct list_head *head; | |
694 | struct dquot *dquot; | |
695 | ||
696 | head = free_dquots.prev; | |
697 | while (head != &free_dquots && count) { | |
698 | dquot = list_entry(head, struct dquot, dq_free); | |
699 | remove_dquot_hash(dquot); | |
700 | remove_free_dquot(dquot); | |
701 | remove_inuse(dquot); | |
74f783af | 702 | do_destroy_dquot(dquot); |
1da177e4 LT |
703 | count--; |
704 | head = free_dquots.prev; | |
705 | } | |
706 | } | |
707 | ||
708 | /* | |
709 | * This is called from kswapd when we think we need some | |
710 | * more memory | |
711 | */ | |
1495f230 YH |
712 | static int shrink_dqcache_memory(struct shrinker *shrink, |
713 | struct shrink_control *sc) | |
1da177e4 | 714 | { |
1495f230 YH |
715 | int nr = sc->nr_to_scan; |
716 | ||
1da177e4 LT |
717 | if (nr) { |
718 | spin_lock(&dq_list_lock); | |
719 | prune_dqcache(nr); | |
720 | spin_unlock(&dq_list_lock); | |
721 | } | |
55f841ce GC |
722 | return vfs_pressure_ratio( |
723 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
724 | } |
725 | ||
8e1f936b RR |
726 | static struct shrinker dqcache_shrinker = { |
727 | .shrink = shrink_dqcache_memory, | |
728 | .seeks = DEFAULT_SEEKS, | |
729 | }; | |
730 | ||
1da177e4 LT |
731 | /* |
732 | * Put reference to dquot | |
733 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 734 | */ |
3d9ea253 | 735 | void dqput(struct dquot *dquot) |
1da177e4 | 736 | { |
b48d3805 JK |
737 | int ret; |
738 | ||
1da177e4 LT |
739 | if (!dquot) |
740 | return; | |
62af9b52 | 741 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 742 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 743 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
744 | quotatypes[dquot->dq_id.type], |
745 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
746 | BUG(); |
747 | } | |
748 | #endif | |
dde95888 | 749 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
750 | we_slept: |
751 | spin_lock(&dq_list_lock); | |
752 | if (atomic_read(&dquot->dq_count) > 1) { | |
753 | /* We have more than one user... nothing to do */ | |
754 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 755 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 756 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 JK |
757 | atomic_read(&dquot->dq_count) == 1) |
758 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
759 | spin_unlock(&dq_list_lock); |
760 | return; | |
761 | } | |
762 | /* Need to release dquot? */ | |
763 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
764 | spin_unlock(&dq_list_lock); | |
765 | /* Commit dquot before releasing */ | |
b48d3805 JK |
766 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
767 | if (ret < 0) { | |
fb5ffb0e JZ |
768 | quota_error(dquot->dq_sb, "Can't write quota structure" |
769 | " (error %d). Quota may get out of sync!", | |
770 | ret); | |
b48d3805 JK |
771 | /* |
772 | * We clear dirty bit anyway, so that we avoid | |
773 | * infinite loop here | |
774 | */ | |
775 | spin_lock(&dq_list_lock); | |
776 | clear_dquot_dirty(dquot); | |
777 | spin_unlock(&dq_list_lock); | |
778 | } | |
1da177e4 LT |
779 | goto we_slept; |
780 | } | |
781 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
782 | clear_dquot_dirty(dquot); | |
783 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
784 | spin_unlock(&dq_list_lock); | |
785 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
786 | goto we_slept; | |
787 | } | |
788 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 789 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 790 | /* sanity check */ |
8abf6a47 | 791 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
792 | #endif |
793 | put_dquot_last(dquot); | |
794 | spin_unlock(&dq_list_lock); | |
795 | } | |
08d0350c | 796 | EXPORT_SYMBOL(dqput); |
1da177e4 | 797 | |
7d9056ba | 798 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
799 | { |
800 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
801 | } | |
7d9056ba | 802 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 803 | |
1da177e4 LT |
804 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
805 | { | |
806 | struct dquot *dquot; | |
807 | ||
74f783af | 808 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 809 | if(!dquot) |
dd6f3c6d | 810 | return NULL; |
1da177e4 | 811 | |
d3be915f | 812 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
813 | INIT_LIST_HEAD(&dquot->dq_free); |
814 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
815 | INIT_HLIST_NODE(&dquot->dq_hash); | |
816 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 817 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 | 818 | dquot->dq_sb = sb; |
1a06d420 | 819 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 LT |
820 | atomic_set(&dquot->dq_count, 1); |
821 | ||
822 | return dquot; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Get reference to dquot | |
cc33412f JK |
827 | * |
828 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
829 | * destroying our dquot by: | |
830 | * a) checking for quota flags under dq_list_lock and | |
831 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 832 | */ |
aca645a6 | 833 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 834 | { |
1a06d420 | 835 | unsigned int hashent = hashfn(sb, qid); |
dd6f3c6d | 836 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 837 | |
1a06d420 | 838 | if (!sb_has_quota_active(sb, qid.type)) |
dd6f3c6d | 839 | return NULL; |
1da177e4 LT |
840 | we_slept: |
841 | spin_lock(&dq_list_lock); | |
cc33412f | 842 | spin_lock(&dq_state_lock); |
1a06d420 | 843 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
844 | spin_unlock(&dq_state_lock); |
845 | spin_unlock(&dq_list_lock); | |
846 | goto out; | |
847 | } | |
848 | spin_unlock(&dq_state_lock); | |
849 | ||
1a06d420 | 850 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
851 | if (!dquot) { |
852 | if (!empty) { | |
1da177e4 | 853 | spin_unlock(&dq_list_lock); |
1a06d420 | 854 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 855 | if (!empty) |
1da177e4 LT |
856 | schedule(); /* Try to wait for a moment... */ |
857 | goto we_slept; | |
858 | } | |
859 | dquot = empty; | |
dd6f3c6d | 860 | empty = NULL; |
4c376dca | 861 | dquot->dq_id = qid; |
1da177e4 LT |
862 | /* all dquots go on the inuse_list */ |
863 | put_inuse(dquot); | |
864 | /* hash it first so it can be found */ | |
865 | insert_dquot_hash(dquot); | |
1da177e4 | 866 | spin_unlock(&dq_list_lock); |
dde95888 | 867 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
868 | } else { |
869 | if (!atomic_read(&dquot->dq_count)) | |
870 | remove_free_dquot(dquot); | |
871 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 872 | spin_unlock(&dq_list_lock); |
dde95888 DM |
873 | dqstats_inc(DQST_CACHE_HITS); |
874 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 875 | } |
268157ba JK |
876 | /* Wait for dq_lock - after this we know that either dquot_release() is |
877 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 878 | wait_on_dquot(dquot); |
268157ba JK |
879 | /* Read the dquot / allocate space in quota file */ |
880 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
881 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 882 | dqput(dquot); |
dd6f3c6d | 883 | dquot = NULL; |
cc33412f | 884 | goto out; |
1da177e4 | 885 | } |
62af9b52 | 886 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 887 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 888 | #endif |
cc33412f JK |
889 | out: |
890 | if (empty) | |
891 | do_destroy_dquot(empty); | |
1da177e4 LT |
892 | |
893 | return dquot; | |
894 | } | |
08d0350c | 895 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
896 | |
897 | static int dqinit_needed(struct inode *inode, int type) | |
898 | { | |
899 | int cnt; | |
900 | ||
901 | if (IS_NOQUOTA(inode)) | |
902 | return 0; | |
903 | if (type != -1) | |
dd6f3c6d | 904 | return !inode->i_dquot[type]; |
1da177e4 | 905 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 906 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
907 | return 1; |
908 | return 0; | |
909 | } | |
910 | ||
d3be915f | 911 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
912 | static void add_dquot_ref(struct super_block *sb, int type) |
913 | { | |
941d2380 | 914 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 915 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 916 | int reserved = 0; |
4c5e6c0e | 917 | #endif |
1da177e4 | 918 | |
55fa6091 | 919 | spin_lock(&inode_sb_list_lock); |
d003fb70 | 920 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
921 | spin_lock(&inode->i_lock); |
922 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
923 | !atomic_read(&inode->i_writecount) || | |
924 | !dqinit_needed(inode, type)) { | |
925 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 926 | continue; |
250df6ed | 927 | } |
d003fb70 | 928 | __iget(inode); |
250df6ed | 929 | spin_unlock(&inode->i_lock); |
55fa6091 | 930 | spin_unlock(&inode_sb_list_lock); |
d003fb70 | 931 | |
d7e97117 JK |
932 | #ifdef CONFIG_QUOTA_DEBUG |
933 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
934 | reserved = 1; | |
935 | #endif | |
941d2380 | 936 | iput(old_inode); |
871a2931 | 937 | __dquot_initialize(inode, type); |
55fa6091 DC |
938 | |
939 | /* | |
940 | * We hold a reference to 'inode' so it couldn't have been | |
941 | * removed from s_inodes list while we dropped the | |
942 | * inode_sb_list_lock We cannot iput the inode now as we can be | |
943 | * holding the last reference and we cannot iput it under | |
944 | * inode_sb_list_lock. So we keep the reference and iput it | |
945 | * later. | |
946 | */ | |
941d2380 | 947 | old_inode = inode; |
55fa6091 | 948 | spin_lock(&inode_sb_list_lock); |
1da177e4 | 949 | } |
55fa6091 | 950 | spin_unlock(&inode_sb_list_lock); |
941d2380 | 951 | iput(old_inode); |
0a5a9c72 | 952 | |
62af9b52 | 953 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 954 | if (reserved) { |
fb5ffb0e JZ |
955 | quota_error(sb, "Writes happened before quota was turned on " |
956 | "thus quota information is probably inconsistent. " | |
957 | "Please run quotacheck(8)"); | |
0a5a9c72 | 958 | } |
4c5e6c0e | 959 | #endif |
1da177e4 LT |
960 | } |
961 | ||
268157ba JK |
962 | /* |
963 | * Return 0 if dqput() won't block. | |
964 | * (note that 1 doesn't necessarily mean blocking) | |
965 | */ | |
1da177e4 LT |
966 | static inline int dqput_blocks(struct dquot *dquot) |
967 | { | |
968 | if (atomic_read(&dquot->dq_count) <= 1) | |
969 | return 1; | |
970 | return 0; | |
971 | } | |
972 | ||
268157ba JK |
973 | /* |
974 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 975 | * if we have the last reference to dquot |
268157ba JK |
976 | * We can't race with anybody because we hold dqptr_sem for writing... |
977 | */ | |
e5f00f42 AB |
978 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
979 | struct list_head *tofree_head) | |
1da177e4 LT |
980 | { |
981 | struct dquot *dquot = inode->i_dquot[type]; | |
982 | ||
dd6f3c6d JK |
983 | inode->i_dquot[type] = NULL; |
984 | if (dquot) { | |
1da177e4 | 985 | if (dqput_blocks(dquot)) { |
62af9b52 | 986 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 987 | if (atomic_read(&dquot->dq_count) != 1) |
fb5ffb0e JZ |
988 | quota_error(inode->i_sb, "Adding dquot with " |
989 | "dq_count %d to dispose list", | |
990 | atomic_read(&dquot->dq_count)); | |
1da177e4 LT |
991 | #endif |
992 | spin_lock(&dq_list_lock); | |
268157ba JK |
993 | /* As dquot must have currently users it can't be on |
994 | * the free list... */ | |
995 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
996 | spin_unlock(&dq_list_lock); |
997 | return 1; | |
998 | } | |
999 | else | |
1000 | dqput(dquot); /* We have guaranteed we won't block */ | |
1001 | } | |
1002 | return 0; | |
1003 | } | |
1004 | ||
268157ba JK |
1005 | /* |
1006 | * Free list of dquots | |
1007 | * Dquots are removed from inodes and no new references can be got so we are | |
1008 | * the only ones holding reference | |
1009 | */ | |
1da177e4 LT |
1010 | static void put_dquot_list(struct list_head *tofree_head) |
1011 | { | |
1012 | struct list_head *act_head; | |
1013 | struct dquot *dquot; | |
1014 | ||
1015 | act_head = tofree_head->next; | |
1da177e4 LT |
1016 | while (act_head != tofree_head) { |
1017 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1018 | act_head = act_head->next; | |
268157ba JK |
1019 | /* Remove dquot from the list so we won't have problems... */ |
1020 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1021 | dqput(dquot); |
1022 | } | |
1023 | } | |
1024 | ||
fb58b731 CH |
1025 | static void remove_dquot_ref(struct super_block *sb, int type, |
1026 | struct list_head *tofree_head) | |
1027 | { | |
1028 | struct inode *inode; | |
7af9cce8 | 1029 | int reserved = 0; |
fb58b731 | 1030 | |
55fa6091 | 1031 | spin_lock(&inode_sb_list_lock); |
fb58b731 | 1032 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1033 | /* |
1034 | * We have to scan also I_NEW inodes because they can already | |
1035 | * have quota pointer initialized. Luckily, we need to touch | |
1036 | * only quota pointers and these have separate locking | |
1037 | * (dqptr_sem). | |
1038 | */ | |
7af9cce8 DM |
1039 | if (!IS_NOQUOTA(inode)) { |
1040 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1041 | reserved = 1; | |
fb58b731 | 1042 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1043 | } |
fb58b731 | 1044 | } |
55fa6091 | 1045 | spin_unlock(&inode_sb_list_lock); |
7af9cce8 DM |
1046 | #ifdef CONFIG_QUOTA_DEBUG |
1047 | if (reserved) { | |
1048 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1049 | " was disabled thus quota information is probably " | |
1050 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1051 | } | |
1052 | #endif | |
fb58b731 CH |
1053 | } |
1054 | ||
1da177e4 LT |
1055 | /* Gather all references from inodes and drop them */ |
1056 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1057 | { | |
1058 | LIST_HEAD(tofree_head); | |
1059 | ||
fb58b731 CH |
1060 | if (sb->dq_op) { |
1061 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1062 | remove_dquot_ref(sb, type, &tofree_head); | |
1063 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
1064 | put_dquot_list(&tofree_head); | |
1065 | } | |
1da177e4 LT |
1066 | } |
1067 | ||
12095460 | 1068 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1069 | { |
1070 | dquot->dq_dqb.dqb_curinodes += number; | |
1071 | } | |
1072 | ||
1073 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1074 | { | |
1075 | dquot->dq_dqb.dqb_curspace += number; | |
1076 | } | |
1077 | ||
f18df228 MC |
1078 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1079 | { | |
1080 | dquot->dq_dqb.dqb_rsvspace += number; | |
1081 | } | |
1082 | ||
740d9dcd MC |
1083 | /* |
1084 | * Claim reserved quota space | |
1085 | */ | |
0a5a9c72 | 1086 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1087 | { |
0a5a9c72 JK |
1088 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1089 | WARN_ON_ONCE(1); | |
1090 | number = dquot->dq_dqb.dqb_rsvspace; | |
1091 | } | |
740d9dcd MC |
1092 | dquot->dq_dqb.dqb_curspace += number; |
1093 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1094 | } | |
1095 | ||
1c8924eb JK |
1096 | static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) |
1097 | { | |
1098 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) | |
1099 | number = dquot->dq_dqb.dqb_curspace; | |
1100 | dquot->dq_dqb.dqb_rsvspace += number; | |
1101 | dquot->dq_dqb.dqb_curspace -= number; | |
1102 | } | |
1103 | ||
740d9dcd MC |
1104 | static inline |
1105 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1106 | { | |
0a5a9c72 JK |
1107 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1108 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1109 | else { | |
1110 | WARN_ON_ONCE(1); | |
1111 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1112 | } | |
740d9dcd MC |
1113 | } |
1114 | ||
7a2435d8 | 1115 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1116 | { |
db49d2df JK |
1117 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1118 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1119 | dquot->dq_dqb.dqb_curinodes -= number; |
1120 | else | |
1121 | dquot->dq_dqb.dqb_curinodes = 0; | |
1122 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1123 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1124 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1125 | } | |
1126 | ||
7a2435d8 | 1127 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1128 | { |
db49d2df JK |
1129 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1130 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1131 | dquot->dq_dqb.dqb_curspace -= number; |
1132 | else | |
1133 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1134 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1135 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1136 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1137 | } | |
1138 | ||
bf097aaf JK |
1139 | struct dquot_warn { |
1140 | struct super_block *w_sb; | |
7b9c7321 | 1141 | struct kqid w_dq_id; |
bf097aaf JK |
1142 | short w_type; |
1143 | }; | |
1144 | ||
c525460e JK |
1145 | static int warning_issued(struct dquot *dquot, const int warntype) |
1146 | { | |
1147 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1148 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1149 | ((warntype == QUOTA_NL_IHARDWARN || | |
1150 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1151 | ||
1152 | if (!flag) | |
1153 | return 0; | |
1154 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1155 | } | |
1156 | ||
8e893469 | 1157 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1158 | static int flag_print_warnings = 1; |
1159 | ||
bf097aaf | 1160 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1161 | { |
1162 | if (!flag_print_warnings) | |
1163 | return 0; | |
1164 | ||
7b9c7321 | 1165 | switch (warn->w_dq_id.type) { |
1da177e4 | 1166 | case USRQUOTA: |
1a06d420 | 1167 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1168 | case GRPQUOTA: |
7b9c7321 | 1169 | return in_group_p(warn->w_dq_id.gid); |
6c29c50f JK |
1170 | case PRJQUOTA: /* Never taken... Just make gcc happy */ |
1171 | return 0; | |
1da177e4 LT |
1172 | } |
1173 | return 0; | |
1174 | } | |
1175 | ||
1da177e4 | 1176 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1177 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1178 | { |
1179 | char *msg = NULL; | |
24ec839c | 1180 | struct tty_struct *tty; |
bf097aaf | 1181 | int warntype = warn->w_type; |
1da177e4 | 1182 | |
657d3bfa JK |
1183 | if (warntype == QUOTA_NL_IHARDBELOW || |
1184 | warntype == QUOTA_NL_ISOFTBELOW || | |
1185 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1186 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1187 | return; |
1188 | ||
24ec839c PZ |
1189 | tty = get_current_tty(); |
1190 | if (!tty) | |
452a00d2 | 1191 | return; |
bf097aaf | 1192 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1193 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1194 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1195 | else |
24ec839c | 1196 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1197 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1198 | switch (warntype) { |
8e893469 | 1199 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1200 | msg = " file limit reached.\r\n"; |
1201 | break; | |
8e893469 | 1202 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1203 | msg = " file quota exceeded too long.\r\n"; |
1204 | break; | |
8e893469 | 1205 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1206 | msg = " file quota exceeded.\r\n"; |
1207 | break; | |
8e893469 | 1208 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1209 | msg = " block limit reached.\r\n"; |
1210 | break; | |
8e893469 | 1211 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1212 | msg = " block quota exceeded too long.\r\n"; |
1213 | break; | |
8e893469 | 1214 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1215 | msg = " block quota exceeded.\r\n"; |
1216 | break; | |
1217 | } | |
24ec839c | 1218 | tty_write_message(tty, msg); |
452a00d2 | 1219 | tty_kref_put(tty); |
1da177e4 | 1220 | } |
8e893469 JK |
1221 | #endif |
1222 | ||
bf097aaf JK |
1223 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1224 | int warntype) | |
1225 | { | |
1226 | if (warning_issued(dquot, warntype)) | |
1227 | return; | |
1228 | warn->w_type = warntype; | |
1229 | warn->w_sb = dquot->dq_sb; | |
1230 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1231 | } |
1232 | ||
f18df228 MC |
1233 | /* |
1234 | * Write warnings to the console and send warning messages over netlink. | |
1235 | * | |
bf097aaf | 1236 | * Note that this function can call into tty and networking code. |
f18df228 | 1237 | */ |
bf097aaf | 1238 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1239 | { |
1240 | int i; | |
1241 | ||
86e931a3 | 1242 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1243 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1244 | continue; | |
8e893469 | 1245 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1246 | print_warning(&warn[i]); |
8e893469 | 1247 | #endif |
7b9c7321 | 1248 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1249 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1250 | } |
1da177e4 LT |
1251 | } |
1252 | ||
7a2435d8 | 1253 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1254 | { |
4c376dca | 1255 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1256 | |
1257 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1258 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1259 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1260 | } |
1261 | ||
1262 | /* needs dq_data_lock */ | |
bf097aaf JK |
1263 | static int check_idq(struct dquot *dquot, qsize_t inodes, |
1264 | struct dquot_warn *warn) | |
1da177e4 | 1265 | { |
268157ba JK |
1266 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1267 | ||
4c376dca | 1268 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1269 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1270 | return 0; |
1da177e4 LT |
1271 | |
1272 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1273 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1274 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1275 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
efd8f0e6 | 1276 | return -EDQUOT; |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1280 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1281 | dquot->dq_dqb.dqb_itime && | |
1282 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1283 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1284 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
efd8f0e6 | 1285 | return -EDQUOT; |
1da177e4 LT |
1286 | } |
1287 | ||
1288 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1289 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1290 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1291 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
268157ba | 1292 | dquot->dq_dqb.dqb_itime = get_seconds() + |
4c376dca | 1293 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 LT |
1294 | } |
1295 | ||
efd8f0e6 | 1296 | return 0; |
1da177e4 LT |
1297 | } |
1298 | ||
1299 | /* needs dq_data_lock */ | |
bf097aaf JK |
1300 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, |
1301 | struct dquot_warn *warn) | |
1da177e4 | 1302 | { |
f18df228 | 1303 | qsize_t tspace; |
268157ba | 1304 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1305 | |
4c376dca | 1306 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1307 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1308 | return 0; |
1da177e4 | 1309 | |
f18df228 MC |
1310 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1311 | + space; | |
1312 | ||
1da177e4 | 1313 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1314 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1315 | !ignore_hardlimit(dquot)) { |
1316 | if (!prealloc) | |
bf097aaf | 1317 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
efd8f0e6 | 1318 | return -EDQUOT; |
1da177e4 LT |
1319 | } |
1320 | ||
1321 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1322 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1323 | dquot->dq_dqb.dqb_btime && |
1324 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1325 | !ignore_hardlimit(dquot)) { |
1326 | if (!prealloc) | |
bf097aaf | 1327 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
efd8f0e6 | 1328 | return -EDQUOT; |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1332 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1333 | dquot->dq_dqb.dqb_btime == 0) { |
1334 | if (!prealloc) { | |
bf097aaf | 1335 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
268157ba | 1336 | dquot->dq_dqb.dqb_btime = get_seconds() + |
4c376dca | 1337 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
1da177e4 LT |
1338 | } |
1339 | else | |
1340 | /* | |
1341 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1342 | * be always printed | |
1343 | */ | |
efd8f0e6 | 1344 | return -EDQUOT; |
1da177e4 LT |
1345 | } |
1346 | ||
efd8f0e6 | 1347 | return 0; |
1da177e4 LT |
1348 | } |
1349 | ||
12095460 | 1350 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1351 | { |
268157ba JK |
1352 | qsize_t newinodes; |
1353 | ||
657d3bfa | 1354 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1355 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1356 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1357 | return QUOTA_NL_NOWARN; |
1358 | ||
268157ba JK |
1359 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1360 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1361 | return QUOTA_NL_ISOFTBELOW; |
1362 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1363 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1364 | return QUOTA_NL_IHARDBELOW; |
1365 | return QUOTA_NL_NOWARN; | |
1366 | } | |
1367 | ||
1368 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1369 | { | |
1370 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1371 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1372 | return QUOTA_NL_NOWARN; |
1373 | ||
12095460 | 1374 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1375 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1376 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1377 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1378 | return QUOTA_NL_BHARDBELOW; |
1379 | return QUOTA_NL_NOWARN; | |
1380 | } | |
0a5a9c72 | 1381 | |
189eef59 CH |
1382 | static int dquot_active(const struct inode *inode) |
1383 | { | |
1384 | struct super_block *sb = inode->i_sb; | |
1385 | ||
1386 | if (IS_NOQUOTA(inode)) | |
1387 | return 0; | |
1388 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1389 | } | |
1390 | ||
1da177e4 | 1391 | /* |
871a2931 CH |
1392 | * Initialize quota pointers in inode |
1393 | * | |
1394 | * We do things in a bit complicated way but by that we avoid calling | |
1395 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1396 | * | |
1397 | * It is better to call this function outside of any transaction as it | |
1398 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1399 | */ |
871a2931 | 1400 | static void __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1401 | { |
871a2931 | 1402 | int cnt; |
ad1e6e8d | 1403 | struct dquot *got[MAXQUOTAS]; |
cc33412f | 1404 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1405 | qsize_t rsv; |
1da177e4 | 1406 | |
d3be915f IM |
1407 | /* First test before acquiring mutex - solves deadlocks when we |
1408 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1409 | if (!dquot_active(inode)) |
871a2931 | 1410 | return; |
cc33412f JK |
1411 | |
1412 | /* First get references to structures we might need. */ | |
1413 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1414 | struct kqid qid; |
ad1e6e8d | 1415 | got[cnt] = NULL; |
cc33412f JK |
1416 | if (type != -1 && cnt != type) |
1417 | continue; | |
1418 | switch (cnt) { | |
1419 | case USRQUOTA: | |
aca645a6 | 1420 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1421 | break; |
1422 | case GRPQUOTA: | |
aca645a6 | 1423 | qid = make_kqid_gid(inode->i_gid); |
cc33412f JK |
1424 | break; |
1425 | } | |
aca645a6 | 1426 | got[cnt] = dqget(sb, qid); |
cc33412f JK |
1427 | } |
1428 | ||
1429 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1430 | if (IS_NOQUOTA(inode)) |
1431 | goto out_err; | |
1432 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1433 | if (type != -1 && cnt != type) | |
1434 | continue; | |
cc33412f JK |
1435 | /* Avoid races with quotaoff() */ |
1436 | if (!sb_has_quota_active(sb, cnt)) | |
1437 | continue; | |
4408ea41 JK |
1438 | /* We could race with quotaon or dqget() could have failed */ |
1439 | if (!got[cnt]) | |
1440 | continue; | |
dd6f3c6d | 1441 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1442 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1443 | got[cnt] = NULL; |
0a5a9c72 JK |
1444 | /* |
1445 | * Make quota reservation system happy if someone | |
1446 | * did a write before quota was turned on | |
1447 | */ | |
1448 | rsv = inode_get_rsv_space(inode); | |
68ac8bfb JM |
1449 | if (unlikely(rsv)) { |
1450 | spin_lock(&dq_data_lock); | |
0a5a9c72 | 1451 | dquot_resv_space(inode->i_dquot[cnt], rsv); |
68ac8bfb JM |
1452 | spin_unlock(&dq_data_lock); |
1453 | } | |
1da177e4 LT |
1454 | } |
1455 | } | |
1456 | out_err: | |
cc33412f JK |
1457 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1458 | /* Drop unused references */ | |
dc52dd3a | 1459 | dqput_all(got); |
871a2931 CH |
1460 | } |
1461 | ||
1462 | void dquot_initialize(struct inode *inode) | |
1463 | { | |
1464 | __dquot_initialize(inode, -1); | |
1da177e4 | 1465 | } |
08d0350c | 1466 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1467 | |
1468 | /* | |
1469 | * Release all quotas referenced by inode | |
1da177e4 | 1470 | */ |
9f754758 | 1471 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1472 | { |
1473 | int cnt; | |
cc33412f | 1474 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1475 | |
cc33412f | 1476 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1477 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1478 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1479 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1480 | } |
1481 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1482 | dqput_all(put); |
1da177e4 LT |
1483 | } |
1484 | ||
9f754758 CH |
1485 | void dquot_drop(struct inode *inode) |
1486 | { | |
1487 | int cnt; | |
1488 | ||
1489 | if (IS_NOQUOTA(inode)) | |
1490 | return; | |
1491 | ||
1492 | /* | |
1493 | * Test before calling to rule out calls from proc and such | |
1494 | * where we are not allowed to block. Note that this is | |
1495 | * actually reliable test even without the lock - the caller | |
1496 | * must assure that nobody can come after the DQUOT_DROP and | |
1497 | * add quota pointers back anyway. | |
1498 | */ | |
1499 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1500 | if (inode->i_dquot[cnt]) | |
1501 | break; | |
1502 | } | |
1503 | ||
1504 | if (cnt < MAXQUOTAS) | |
1505 | __dquot_drop(inode); | |
1506 | } | |
1507 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1508 | |
fd8fbfc1 DM |
1509 | /* |
1510 | * inode_reserved_space is managed internally by quota, and protected by | |
1511 | * i_lock similar to i_blocks+i_bytes. | |
1512 | */ | |
1513 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1514 | { | |
1515 | /* Filesystem must explicitly define it's own method in order to use | |
1516 | * quota reservation interface */ | |
1517 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1518 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1519 | } | |
1520 | ||
c469070a | 1521 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1522 | { |
1523 | spin_lock(&inode->i_lock); | |
1524 | *inode_reserved_space(inode) += number; | |
1525 | spin_unlock(&inode->i_lock); | |
1526 | } | |
c469070a | 1527 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1528 | |
c469070a | 1529 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1530 | { |
1531 | spin_lock(&inode->i_lock); | |
1532 | *inode_reserved_space(inode) -= number; | |
1533 | __inode_add_bytes(inode, number); | |
1534 | spin_unlock(&inode->i_lock); | |
1535 | } | |
c469070a | 1536 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1537 | |
1c8924eb JK |
1538 | void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) |
1539 | { | |
1540 | spin_lock(&inode->i_lock); | |
1541 | *inode_reserved_space(inode) += number; | |
1542 | __inode_sub_bytes(inode, number); | |
1543 | spin_unlock(&inode->i_lock); | |
1544 | } | |
1545 | EXPORT_SYMBOL(inode_reclaim_rsv_space); | |
1546 | ||
c469070a | 1547 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1548 | { |
1549 | spin_lock(&inode->i_lock); | |
1550 | *inode_reserved_space(inode) -= number; | |
1551 | spin_unlock(&inode->i_lock); | |
1552 | } | |
c469070a | 1553 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1554 | |
1555 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1556 | { | |
1557 | qsize_t ret; | |
05b5d898 JK |
1558 | |
1559 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1560 | return 0; | |
fd8fbfc1 DM |
1561 | spin_lock(&inode->i_lock); |
1562 | ret = *inode_reserved_space(inode); | |
1563 | spin_unlock(&inode->i_lock); | |
1564 | return ret; | |
1565 | } | |
1566 | ||
1567 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1568 | int reserve) | |
1569 | { | |
1570 | if (reserve) | |
1571 | inode_add_rsv_space(inode, number); | |
1572 | else | |
1573 | inode_add_bytes(inode, number); | |
1574 | } | |
1575 | ||
1576 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1577 | { | |
1578 | if (reserve) | |
1579 | inode_sub_rsv_space(inode, number); | |
1580 | else | |
1581 | inode_sub_bytes(inode, number); | |
1582 | } | |
1583 | ||
1da177e4 | 1584 | /* |
5dd4056d CH |
1585 | * This functions updates i_blocks+i_bytes fields and quota information |
1586 | * (together with appropriate checks). | |
1587 | * | |
1588 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1589 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1590 | * the current transaction so that dquot write and inode write go into the | |
1591 | * same transaction. | |
1da177e4 LT |
1592 | */ |
1593 | ||
1594 | /* | |
1595 | * This operation can block, but only after everything is updated | |
1596 | */ | |
56246f9a | 1597 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1598 | { |
5dd4056d | 1599 | int cnt, ret = 0; |
bf097aaf JK |
1600 | struct dquot_warn warn[MAXQUOTAS]; |
1601 | struct dquot **dquots = inode->i_dquot; | |
56246f9a | 1602 | int reserve = flags & DQUOT_SPACE_RESERVE; |
1da177e4 | 1603 | |
fd8fbfc1 DM |
1604 | /* |
1605 | * First test before acquiring mutex - solves deadlocks when we | |
1606 | * re-enter the quota code and are already holding the mutex | |
1607 | */ | |
189eef59 | 1608 | if (!dquot_active(inode)) { |
fd8fbfc1 DM |
1609 | inode_incr_space(inode, number, reserve); |
1610 | goto out; | |
1611 | } | |
1612 | ||
1da177e4 | 1613 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1614 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1615 | |
6ea2eea1 | 1616 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1617 | spin_lock(&dq_data_lock); |
1618 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1619 | if (!dquots[cnt]) |
1da177e4 | 1620 | continue; |
bf097aaf JK |
1621 | ret = check_bdq(dquots[cnt], number, |
1622 | !(flags & DQUOT_SPACE_WARN), &warn[cnt]); | |
1623 | if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { | |
fd8fbfc1 DM |
1624 | spin_unlock(&dq_data_lock); |
1625 | goto out_flush_warn; | |
f18df228 | 1626 | } |
1da177e4 LT |
1627 | } |
1628 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1629 | if (!dquots[cnt]) |
1da177e4 | 1630 | continue; |
f18df228 | 1631 | if (reserve) |
bf097aaf | 1632 | dquot_resv_space(dquots[cnt], number); |
f18df228 | 1633 | else |
bf097aaf | 1634 | dquot_incr_space(dquots[cnt], number); |
1da177e4 | 1635 | } |
fd8fbfc1 | 1636 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1637 | spin_unlock(&dq_data_lock); |
f18df228 | 1638 | |
fd8fbfc1 DM |
1639 | if (reserve) |
1640 | goto out_flush_warn; | |
bf097aaf | 1641 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1642 | out_flush_warn: |
1da177e4 | 1643 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
bf097aaf | 1644 | flush_warnings(warn); |
f18df228 MC |
1645 | out: |
1646 | return ret; | |
1647 | } | |
5dd4056d | 1648 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1649 | |
1650 | /* | |
1651 | * This operation can block, but only after everything is updated | |
1652 | */ | |
63936dda | 1653 | int dquot_alloc_inode(const struct inode *inode) |
1da177e4 | 1654 | { |
efd8f0e6 | 1655 | int cnt, ret = 0; |
bf097aaf JK |
1656 | struct dquot_warn warn[MAXQUOTAS]; |
1657 | struct dquot * const *dquots = inode->i_dquot; | |
1da177e4 | 1658 | |
d3be915f IM |
1659 | /* First test before acquiring mutex - solves deadlocks when we |
1660 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1661 | if (!dquot_active(inode)) |
63936dda | 1662 | return 0; |
1da177e4 | 1663 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1664 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1665 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1666 | spin_lock(&dq_data_lock); |
1667 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1668 | if (!dquots[cnt]) |
1da177e4 | 1669 | continue; |
bf097aaf | 1670 | ret = check_idq(dquots[cnt], 1, &warn[cnt]); |
efd8f0e6 | 1671 | if (ret) |
1da177e4 LT |
1672 | goto warn_put_all; |
1673 | } | |
1674 | ||
1675 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1676 | if (!dquots[cnt]) |
1da177e4 | 1677 | continue; |
bf097aaf | 1678 | dquot_incr_inodes(dquots[cnt], 1); |
1da177e4 | 1679 | } |
efd8f0e6 | 1680 | |
1da177e4 LT |
1681 | warn_put_all: |
1682 | spin_unlock(&dq_data_lock); | |
63936dda | 1683 | if (ret == 0) |
bf097aaf | 1684 | mark_all_dquot_dirty(dquots); |
1da177e4 | 1685 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
bf097aaf | 1686 | flush_warnings(warn); |
1da177e4 LT |
1687 | return ret; |
1688 | } | |
08d0350c | 1689 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1690 | |
5dd4056d CH |
1691 | /* |
1692 | * Convert in-memory reserved quotas to real consumed quotas | |
1693 | */ | |
1694 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd MC |
1695 | { |
1696 | int cnt; | |
740d9dcd | 1697 | |
189eef59 | 1698 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1699 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1700 | return 0; |
740d9dcd MC |
1701 | } |
1702 | ||
1703 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
740d9dcd MC |
1704 | spin_lock(&dq_data_lock); |
1705 | /* Claim reserved quotas to allocated quotas */ | |
1706 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1707 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1708 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1709 | number); | |
1710 | } | |
1711 | /* Update inode bytes */ | |
fd8fbfc1 | 1712 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1713 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1714 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd | 1715 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
5dd4056d | 1716 | return 0; |
740d9dcd | 1717 | } |
5dd4056d | 1718 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1719 | |
1c8924eb JK |
1720 | /* |
1721 | * Convert allocated space back to in-memory reserved quotas | |
1722 | */ | |
1723 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1724 | { | |
1725 | int cnt; | |
1726 | ||
1727 | if (!dquot_active(inode)) { | |
1728 | inode_reclaim_rsv_space(inode, number); | |
1729 | return; | |
1730 | } | |
1731 | ||
1732 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1733 | spin_lock(&dq_data_lock); | |
1734 | /* Claim reserved quotas to allocated quotas */ | |
1735 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1736 | if (inode->i_dquot[cnt]) | |
1737 | dquot_reclaim_reserved_space(inode->i_dquot[cnt], | |
1738 | number); | |
1739 | } | |
1740 | /* Update inode bytes */ | |
1741 | inode_reclaim_rsv_space(inode, number); | |
1742 | spin_unlock(&dq_data_lock); | |
1743 | mark_all_dquot_dirty(inode->i_dquot); | |
1744 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1745 | return; | |
1746 | } | |
1747 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1748 | ||
1da177e4 LT |
1749 | /* |
1750 | * This operation can block, but only after everything is updated | |
1751 | */ | |
56246f9a | 1752 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1753 | { |
1754 | unsigned int cnt; | |
bf097aaf JK |
1755 | struct dquot_warn warn[MAXQUOTAS]; |
1756 | struct dquot **dquots = inode->i_dquot; | |
56246f9a | 1757 | int reserve = flags & DQUOT_SPACE_RESERVE; |
1da177e4 | 1758 | |
d3be915f IM |
1759 | /* First test before acquiring mutex - solves deadlocks when we |
1760 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1761 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1762 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1763 | return; |
1da177e4 | 1764 | } |
657d3bfa | 1765 | |
1da177e4 | 1766 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1767 | spin_lock(&dq_data_lock); |
1768 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1769 | int wtype; |
1770 | ||
1771 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1772 | if (!dquots[cnt]) | |
1da177e4 | 1773 | continue; |
bf097aaf JK |
1774 | wtype = info_bdq_free(dquots[cnt], number); |
1775 | if (wtype != QUOTA_NL_NOWARN) | |
1776 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1777 | if (reserve) |
bf097aaf | 1778 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1779 | else |
bf097aaf | 1780 | dquot_decr_space(dquots[cnt], number); |
1da177e4 | 1781 | } |
fd8fbfc1 | 1782 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1783 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1784 | |
1785 | if (reserve) | |
1786 | goto out_unlock; | |
bf097aaf | 1787 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1788 | out_unlock: |
1da177e4 | 1789 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
bf097aaf | 1790 | flush_warnings(warn); |
fd8fbfc1 | 1791 | } |
5dd4056d | 1792 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1793 | |
1da177e4 LT |
1794 | /* |
1795 | * This operation can block, but only after everything is updated | |
1796 | */ | |
63936dda | 1797 | void dquot_free_inode(const struct inode *inode) |
1da177e4 LT |
1798 | { |
1799 | unsigned int cnt; | |
bf097aaf JK |
1800 | struct dquot_warn warn[MAXQUOTAS]; |
1801 | struct dquot * const *dquots = inode->i_dquot; | |
1da177e4 | 1802 | |
d3be915f IM |
1803 | /* First test before acquiring mutex - solves deadlocks when we |
1804 | * re-enter the quota code and are already holding the mutex */ | |
189eef59 | 1805 | if (!dquot_active(inode)) |
63936dda | 1806 | return; |
657d3bfa | 1807 | |
1da177e4 | 1808 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1809 | spin_lock(&dq_data_lock); |
1810 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1811 | int wtype; |
1812 | ||
1813 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1814 | if (!dquots[cnt]) | |
1da177e4 | 1815 | continue; |
bf097aaf JK |
1816 | wtype = info_idq_free(dquots[cnt], 1); |
1817 | if (wtype != QUOTA_NL_NOWARN) | |
1818 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1819 | dquot_decr_inodes(dquots[cnt], 1); | |
1da177e4 LT |
1820 | } |
1821 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1822 | mark_all_dquot_dirty(dquots); |
1da177e4 | 1823 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
bf097aaf | 1824 | flush_warnings(warn); |
1da177e4 | 1825 | } |
08d0350c | 1826 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1827 | |
1828 | /* | |
1829 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1830 | * On success, dquot references in transfer_to are consumed and references |
1831 | * to original dquots that need to be released are placed there. On failure, | |
1832 | * references are kept untouched. | |
1da177e4 LT |
1833 | * |
1834 | * This operation can block, but only after everything is updated | |
1835 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1836 | * |
1da177e4 | 1837 | */ |
bc8e5f07 | 1838 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1839 | { |
740d9dcd MC |
1840 | qsize_t space, cur_space; |
1841 | qsize_t rsv_space = 0; | |
bc8e5f07 | 1842 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1843 | int cnt, ret = 0; |
9e32784b | 1844 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1845 | struct dquot_warn warn_to[MAXQUOTAS]; |
1846 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1847 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1848 | |
d3be915f IM |
1849 | /* First test before acquiring mutex - solves deadlocks when we |
1850 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 | 1851 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1852 | return 0; |
cc33412f | 1853 | /* Initialize the arrays */ |
bf097aaf JK |
1854 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1855 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1856 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1857 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1858 | } | |
cc33412f | 1859 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
cc33412f JK |
1860 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
1861 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
bc8e5f07 | 1862 | return 0; |
cc33412f | 1863 | } |
1da177e4 | 1864 | spin_lock(&dq_data_lock); |
740d9dcd | 1865 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1866 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1867 | space = cur_space + rsv_space; |
1da177e4 LT |
1868 | /* Build the transfer_from list and check the limits */ |
1869 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b D |
1870 | /* |
1871 | * Skip changes for same uid or gid or for turned off quota-type. | |
1872 | */ | |
dd6f3c6d | 1873 | if (!transfer_to[cnt]) |
1da177e4 | 1874 | continue; |
9e32784b D |
1875 | /* Avoid races with quotaoff() */ |
1876 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1877 | continue; | |
1878 | is_valid[cnt] = 1; | |
1da177e4 | 1879 | transfer_from[cnt] = inode->i_dquot[cnt]; |
bf097aaf | 1880 | ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); |
efd8f0e6 CH |
1881 | if (ret) |
1882 | goto over_quota; | |
bf097aaf | 1883 | ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); |
efd8f0e6 | 1884 | if (ret) |
cc33412f | 1885 | goto over_quota; |
1da177e4 LT |
1886 | } |
1887 | ||
1888 | /* | |
1889 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1890 | */ | |
1891 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b | 1892 | if (!is_valid[cnt]) |
1da177e4 | 1893 | continue; |
1da177e4 LT |
1894 | /* Due to IO error we might not have transfer_from[] structure */ |
1895 | if (transfer_from[cnt]) { | |
bf097aaf JK |
1896 | int wtype; |
1897 | wtype = info_idq_free(transfer_from[cnt], 1); | |
1898 | if (wtype != QUOTA_NL_NOWARN) | |
1899 | prepare_warning(&warn_from_inodes[cnt], | |
1900 | transfer_from[cnt], wtype); | |
1901 | wtype = info_bdq_free(transfer_from[cnt], space); | |
1902 | if (wtype != QUOTA_NL_NOWARN) | |
1903 | prepare_warning(&warn_from_space[cnt], | |
1904 | transfer_from[cnt], wtype); | |
1da177e4 | 1905 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1906 | dquot_decr_space(transfer_from[cnt], cur_space); |
1907 | dquot_free_reserved_space(transfer_from[cnt], | |
1908 | rsv_space); | |
1da177e4 LT |
1909 | } |
1910 | ||
1911 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1912 | dquot_incr_space(transfer_to[cnt], cur_space); |
1913 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1914 | |
1915 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1916 | } | |
1da177e4 | 1917 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1918 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1919 | ||
dc52dd3a DM |
1920 | mark_all_dquot_dirty(transfer_from); |
1921 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
1922 | flush_warnings(warn_to); |
1923 | flush_warnings(warn_from_inodes); | |
1924 | flush_warnings(warn_from_space); | |
bc8e5f07 | 1925 | /* Pass back references to put */ |
dc52dd3a | 1926 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
1927 | if (is_valid[cnt]) |
1928 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 1929 | return 0; |
cc33412f JK |
1930 | over_quota: |
1931 | spin_unlock(&dq_data_lock); | |
1932 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
bf097aaf | 1933 | flush_warnings(warn_to); |
86f3cbec | 1934 | return ret; |
1da177e4 | 1935 | } |
bc8e5f07 | 1936 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 1937 | |
8ddd69d6 DM |
1938 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1939 | * Called from FSXXX_setattr() | |
1940 | */ | |
b43fa828 | 1941 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1942 | { |
bc8e5f07 JK |
1943 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
1944 | struct super_block *sb = inode->i_sb; | |
1945 | int ret; | |
8ddd69d6 | 1946 | |
189eef59 | 1947 | if (!dquot_active(inode)) |
bc8e5f07 | 1948 | return 0; |
12755627 | 1949 | |
1a06d420 | 1950 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) |
aca645a6 | 1951 | transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid)); |
1a06d420 | 1952 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)) |
aca645a6 | 1953 | transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid)); |
bc8e5f07 JK |
1954 | |
1955 | ret = __dquot_transfer(inode, transfer_to); | |
1956 | dqput_all(transfer_to); | |
1957 | return ret; | |
b85f4b87 | 1958 | } |
b43fa828 | 1959 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 1960 | |
1da177e4 LT |
1961 | /* |
1962 | * Write info of quota file to disk | |
1963 | */ | |
1964 | int dquot_commit_info(struct super_block *sb, int type) | |
1965 | { | |
1966 | int ret; | |
1967 | struct quota_info *dqopt = sb_dqopt(sb); | |
1968 | ||
d3be915f | 1969 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1970 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1971 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1972 | return ret; |
1973 | } | |
08d0350c | 1974 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1975 | |
1976 | /* | |
1977 | * Definitions of diskquota operations. | |
1978 | */ | |
61e225dc | 1979 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1980 | .write_dquot = dquot_commit, |
1981 | .acquire_dquot = dquot_acquire, | |
1982 | .release_dquot = dquot_release, | |
1983 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1984 | .write_info = dquot_commit_info, |
1985 | .alloc_dquot = dquot_alloc, | |
1986 | .destroy_dquot = dquot_destroy, | |
1da177e4 | 1987 | }; |
123e9caf | 1988 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 1989 | |
907f4554 CH |
1990 | /* |
1991 | * Generic helper for ->open on filesystems supporting disk quotas. | |
1992 | */ | |
1993 | int dquot_file_open(struct inode *inode, struct file *file) | |
1994 | { | |
1995 | int error; | |
1996 | ||
1997 | error = generic_file_open(inode, file); | |
1998 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 1999 | dquot_initialize(inode); |
907f4554 CH |
2000 | return error; |
2001 | } | |
2002 | EXPORT_SYMBOL(dquot_file_open); | |
2003 | ||
1da177e4 LT |
2004 | /* |
2005 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2006 | */ | |
0f0dd62f | 2007 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2008 | { |
0ff5af83 | 2009 | int cnt, ret = 0; |
1da177e4 LT |
2010 | struct quota_info *dqopt = sb_dqopt(sb); |
2011 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2012 | |
f55abc0f JK |
2013 | /* Cannot turn off usage accounting without turning off limits, or |
2014 | * suspend quotas and simultaneously turn quotas off. */ | |
2015 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2016 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2017 | DQUOT_USAGE_ENABLED))) | |
2018 | return -EINVAL; | |
2019 | ||
1da177e4 | 2020 | /* We need to serialize quota_off() for device */ |
d3be915f | 2021 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
2022 | |
2023 | /* | |
2024 | * Skip everything if there's nothing to do. We have to do this because | |
2025 | * sometimes we are called when fill_super() failed and calling | |
2026 | * sync_fs() in such cases does no good. | |
2027 | */ | |
f55abc0f | 2028 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
2029 | mutex_unlock(&dqopt->dqonoff_mutex); |
2030 | return 0; | |
2031 | } | |
1da177e4 LT |
2032 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2033 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2034 | if (type != -1 && cnt != type) |
2035 | continue; | |
f55abc0f | 2036 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2037 | continue; |
f55abc0f JK |
2038 | |
2039 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2040 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2041 | dqopt->flags |= |
2042 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2043 | spin_unlock(&dq_state_lock); |
f55abc0f | 2044 | } else { |
cc33412f | 2045 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2046 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2047 | /* Turning off suspended quotas? */ | |
2048 | if (!sb_has_quota_loaded(sb, cnt) && | |
2049 | sb_has_quota_suspended(sb, cnt)) { | |
2050 | dqopt->flags &= ~dquot_state_flag( | |
2051 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2052 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2053 | iput(dqopt->files[cnt]); |
2054 | dqopt->files[cnt] = NULL; | |
2055 | continue; | |
2056 | } | |
cc33412f | 2057 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2058 | } |
f55abc0f JK |
2059 | |
2060 | /* We still have to keep quota loaded? */ | |
2061 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2062 | continue; |
1da177e4 LT |
2063 | |
2064 | /* Note: these are blocking operations */ | |
2065 | drop_dquot_ref(sb, cnt); | |
2066 | invalidate_dquots(sb, cnt); | |
2067 | /* | |
268157ba JK |
2068 | * Now all dquots should be invalidated, all writes done so we |
2069 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2070 | */ |
2071 | if (info_dirty(&dqopt->info[cnt])) | |
2072 | sb->dq_op->write_info(sb, cnt); | |
2073 | if (dqopt->ops[cnt]->free_file_info) | |
2074 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2075 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2076 | ||
2077 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2078 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2079 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2080 | dqopt->info[cnt].dqi_flags = 0; |
2081 | dqopt->info[cnt].dqi_igrace = 0; | |
2082 | dqopt->info[cnt].dqi_bgrace = 0; | |
2083 | dqopt->ops[cnt] = NULL; | |
2084 | } | |
d3be915f | 2085 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2086 | |
2087 | /* Skip syncing and setting flags if quota files are hidden */ | |
2088 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2089 | goto put_inodes; | |
2090 | ||
1da177e4 | 2091 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2092 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2093 | if (sb->s_op->sync_fs) |
2094 | sb->s_op->sync_fs(sb, 1); | |
2095 | sync_blockdev(sb->s_bdev); | |
2096 | /* Now the quota files are just ordinary files and we can set the | |
2097 | * inode flags back. Moreover we discard the pagecache so that | |
2098 | * userspace sees the writes we did bypassing the pagecache. We | |
2099 | * must also discard the blockdev buffers so that we see the | |
2100 | * changes done by userspace on the next quotaon() */ | |
2101 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2102 | if (toputinode[cnt]) { | |
d3be915f | 2103 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2104 | /* If quota was reenabled in the meantime, we have |
2105 | * nothing to do */ | |
f55abc0f | 2106 | if (!sb_has_quota_loaded(sb, cnt)) { |
a80b12c3 | 2107 | mutex_lock(&toputinode[cnt]->i_mutex); |
1da177e4 LT |
2108 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
2109 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
2110 | truncate_inode_pages(&toputinode[cnt]->i_data, |
2111 | 0); | |
1b1dcc1b | 2112 | mutex_unlock(&toputinode[cnt]->i_mutex); |
43d2932d | 2113 | mark_inode_dirty_sync(toputinode[cnt]); |
1da177e4 | 2114 | } |
d3be915f | 2115 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2116 | } |
2117 | if (sb->s_bdev) | |
2118 | invalidate_bdev(sb->s_bdev); | |
2119 | put_inodes: | |
2120 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2121 | if (toputinode[cnt]) { | |
0ff5af83 | 2122 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2123 | * can reenable quota on the subsequent remount RW. We |
2124 | * have to check 'flags' variable and not use sb_has_ | |
2125 | * function because another quotaon / quotaoff could | |
2126 | * change global state before we got here. We refuse | |
2127 | * to suspend quotas when there is pending delete on | |
2128 | * the quota file... */ | |
2129 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2130 | iput(toputinode[cnt]); |
2131 | else if (!toputinode[cnt]->i_nlink) | |
2132 | ret = -EBUSY; | |
1da177e4 | 2133 | } |
0ff5af83 | 2134 | return ret; |
1da177e4 | 2135 | } |
0f0dd62f | 2136 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2137 | |
287a8095 | 2138 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2139 | { |
0f0dd62f CH |
2140 | return dquot_disable(sb, type, |
2141 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2142 | } |
287a8095 | 2143 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2144 | |
1da177e4 LT |
2145 | /* |
2146 | * Turn quotas on on a device | |
2147 | */ | |
2148 | ||
f55abc0f JK |
2149 | /* |
2150 | * Helper function to turn quotas on when we already have the inode of | |
2151 | * quota file and no quota information is loaded. | |
2152 | */ | |
2153 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2154 | unsigned int flags) | |
1da177e4 LT |
2155 | { |
2156 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2157 | struct super_block *sb = inode->i_sb; | |
2158 | struct quota_info *dqopt = sb_dqopt(sb); | |
2159 | int error; | |
2160 | int oldflags = -1; | |
2161 | ||
2162 | if (!fmt) | |
2163 | return -ESRCH; | |
2164 | if (!S_ISREG(inode->i_mode)) { | |
2165 | error = -EACCES; | |
2166 | goto out_fmt; | |
2167 | } | |
2168 | if (IS_RDONLY(inode)) { | |
2169 | error = -EROFS; | |
2170 | goto out_fmt; | |
2171 | } | |
2172 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
2173 | error = -EINVAL; | |
2174 | goto out_fmt; | |
2175 | } | |
f55abc0f JK |
2176 | /* Usage always has to be set... */ |
2177 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2178 | error = -EINVAL; | |
2179 | goto out_fmt; | |
2180 | } | |
1da177e4 | 2181 | |
ca785ec6 | 2182 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2183 | /* As we bypass the pagecache we must now flush all the |
2184 | * dirty data and invalidate caches so that kernel sees | |
2185 | * changes from userspace. It is not enough to just flush | |
2186 | * the quota file since if blocksize < pagesize, invalidation | |
2187 | * of the cache could fail because of other unrelated dirty | |
2188 | * data */ | |
2189 | sync_filesystem(sb); | |
ca785ec6 JK |
2190 | invalidate_bdev(sb->s_bdev); |
2191 | } | |
d3be915f | 2192 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2193 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2194 | error = -EBUSY; |
2195 | goto out_lock; | |
2196 | } | |
ca785ec6 JK |
2197 | |
2198 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2199 | /* We don't want quota and atime on quota files (deadlocks | |
2200 | * possible) Also nobody should write to the file - we use | |
2201 | * special IO operations which ignore the immutable bit. */ | |
a80b12c3 | 2202 | mutex_lock(&inode->i_mutex); |
268157ba JK |
2203 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2204 | S_NOQUOTA); | |
ca785ec6 | 2205 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2206 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
2207 | /* |
2208 | * When S_NOQUOTA is set, remove dquot references as no more | |
2209 | * references can be added | |
2210 | */ | |
9f754758 | 2211 | __dquot_drop(inode); |
ca785ec6 | 2212 | } |
1da177e4 LT |
2213 | |
2214 | error = -EIO; | |
2215 | dqopt->files[type] = igrab(inode); | |
2216 | if (!dqopt->files[type]) | |
2217 | goto out_lock; | |
2218 | error = -EINVAL; | |
2219 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2220 | goto out_file_init; | |
2221 | ||
2222 | dqopt->ops[type] = fmt->qf_ops; | |
2223 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2224 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2225 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2226 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2227 | error = dqopt->ops[type]->read_file_info(sb, type); |
2228 | if (error < 0) { | |
d3be915f | 2229 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2230 | goto out_file_init; |
2231 | } | |
46fe44ce JK |
2232 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) |
2233 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; | |
d3be915f | 2234 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2235 | spin_lock(&dq_state_lock); |
f55abc0f | 2236 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2237 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2238 | |
2239 | add_dquot_ref(sb, type); | |
d3be915f | 2240 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2241 | |
2242 | return 0; | |
2243 | ||
2244 | out_file_init: | |
2245 | dqopt->files[type] = NULL; | |
2246 | iput(inode); | |
2247 | out_lock: | |
1da177e4 | 2248 | if (oldflags != -1) { |
a80b12c3 | 2249 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
2250 | /* Set the flags back (in the case of accidental quotaon() |
2251 | * on a wrong file we don't want to mess up the flags) */ | |
2252 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2253 | inode->i_flags |= oldflags; | |
dee86565 | 2254 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2255 | } |
d01730d7 | 2256 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2257 | out_fmt: |
2258 | put_quota_format(fmt); | |
2259 | ||
2260 | return error; | |
2261 | } | |
2262 | ||
0ff5af83 | 2263 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2264 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2265 | { |
2266 | struct quota_info *dqopt = sb_dqopt(sb); | |
2267 | struct inode *inode; | |
0f0dd62f | 2268 | int ret = 0, cnt; |
f55abc0f | 2269 | unsigned int flags; |
0ff5af83 | 2270 | |
0f0dd62f CH |
2271 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2272 | if (type != -1 && cnt != type) | |
2273 | continue; | |
2274 | ||
2275 | mutex_lock(&dqopt->dqonoff_mutex); | |
2276 | if (!sb_has_quota_suspended(sb, cnt)) { | |
2277 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2278 | continue; | |
2279 | } | |
2280 | inode = dqopt->files[cnt]; | |
2281 | dqopt->files[cnt] = NULL; | |
2282 | spin_lock(&dq_state_lock); | |
2283 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2284 | DQUOT_LIMITS_ENABLED, | |
2285 | cnt); | |
2286 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2287 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2288 | mutex_unlock(&dqopt->dqonoff_mutex); |
0ff5af83 | 2289 | |
0f0dd62f CH |
2290 | flags = dquot_generic_flag(flags, cnt); |
2291 | ret = vfs_load_quota_inode(inode, cnt, | |
2292 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2293 | iput(inode); | |
2294 | } | |
0ff5af83 JK |
2295 | |
2296 | return ret; | |
2297 | } | |
0f0dd62f | 2298 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2299 | |
f00c9e44 JK |
2300 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
2301 | struct path *path) | |
77e69dac AV |
2302 | { |
2303 | int error = security_quota_on(path->dentry); | |
2304 | if (error) | |
2305 | return error; | |
2306 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2307 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2308 | error = -EXDEV; |
2309 | else | |
f55abc0f JK |
2310 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2311 | format_id, DQUOT_USAGE_ENABLED | | |
2312 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2313 | return error; |
2314 | } | |
287a8095 | 2315 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2316 | |
f55abc0f JK |
2317 | /* |
2318 | * More powerful function for turning on quotas allowing setting | |
2319 | * of individual quota flags | |
2320 | */ | |
287a8095 CH |
2321 | int dquot_enable(struct inode *inode, int type, int format_id, |
2322 | unsigned int flags) | |
f55abc0f JK |
2323 | { |
2324 | int ret = 0; | |
2325 | struct super_block *sb = inode->i_sb; | |
2326 | struct quota_info *dqopt = sb_dqopt(sb); | |
2327 | ||
2328 | /* Just unsuspend quotas? */ | |
0f0dd62f CH |
2329 | BUG_ON(flags & DQUOT_SUSPENDED); |
2330 | ||
f55abc0f JK |
2331 | if (!flags) |
2332 | return 0; | |
2333 | /* Just updating flags needed? */ | |
2334 | if (sb_has_quota_loaded(sb, type)) { | |
2335 | mutex_lock(&dqopt->dqonoff_mutex); | |
2336 | /* Now do a reliable test... */ | |
2337 | if (!sb_has_quota_loaded(sb, type)) { | |
2338 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2339 | goto load_quota; | |
2340 | } | |
2341 | if (flags & DQUOT_USAGE_ENABLED && | |
2342 | sb_has_quota_usage_enabled(sb, type)) { | |
2343 | ret = -EBUSY; | |
2344 | goto out_lock; | |
2345 | } | |
2346 | if (flags & DQUOT_LIMITS_ENABLED && | |
2347 | sb_has_quota_limits_enabled(sb, type)) { | |
2348 | ret = -EBUSY; | |
2349 | goto out_lock; | |
2350 | } | |
cc33412f | 2351 | spin_lock(&dq_state_lock); |
f55abc0f | 2352 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2353 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2354 | out_lock: |
2355 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2356 | return ret; | |
2357 | } | |
2358 | ||
2359 | load_quota: | |
2360 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2361 | } | |
287a8095 | 2362 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2363 | |
1da177e4 LT |
2364 | /* |
2365 | * This function is used when filesystem needs to initialize quotas | |
2366 | * during mount time. | |
2367 | */ | |
287a8095 | 2368 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2369 | int format_id, int type) |
1da177e4 | 2370 | { |
84de856e | 2371 | struct dentry *dentry; |
1da177e4 LT |
2372 | int error; |
2373 | ||
c56818d7 | 2374 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2375 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2376 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2377 | if (IS_ERR(dentry)) |
2378 | return PTR_ERR(dentry); | |
2379 | ||
154f484b JK |
2380 | if (!dentry->d_inode) { |
2381 | error = -ENOENT; | |
2382 | goto out; | |
2383 | } | |
2384 | ||
1da177e4 | 2385 | error = security_quota_on(dentry); |
84de856e | 2386 | if (!error) |
f55abc0f JK |
2387 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2388 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2389 | |
154f484b | 2390 | out: |
84de856e CH |
2391 | dput(dentry); |
2392 | return error; | |
1da177e4 | 2393 | } |
287a8095 | 2394 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2395 | |
12095460 JK |
2396 | static inline qsize_t qbtos(qsize_t blocks) |
2397 | { | |
2398 | return blocks << QIF_DQBLKSIZE_BITS; | |
2399 | } | |
2400 | ||
2401 | static inline qsize_t stoqb(qsize_t space) | |
2402 | { | |
2403 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2404 | } | |
2405 | ||
1da177e4 | 2406 | /* Generic routine for getting common part of quota structure */ |
b9b2dd36 | 2407 | static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2408 | { |
2409 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2410 | ||
b9b2dd36 CH |
2411 | memset(di, 0, sizeof(*di)); |
2412 | di->d_version = FS_DQUOT_VERSION; | |
4c376dca | 2413 | di->d_flags = dquot->dq_id.type == USRQUOTA ? |
ade7ce31 | 2414 | FS_USER_QUOTA : FS_GROUP_QUOTA; |
4c376dca | 2415 | di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id); |
b9b2dd36 | 2416 | |
1da177e4 | 2417 | spin_lock(&dq_data_lock); |
b9b2dd36 CH |
2418 | di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); |
2419 | di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); | |
2420 | di->d_ino_hardlimit = dm->dqb_ihardlimit; | |
2421 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
2422 | di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; | |
2423 | di->d_icount = dm->dqb_curinodes; | |
2424 | di->d_btimer = dm->dqb_btime; | |
2425 | di->d_itimer = dm->dqb_itime; | |
1da177e4 LT |
2426 | spin_unlock(&dq_data_lock); |
2427 | } | |
2428 | ||
74a8a103 | 2429 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
287a8095 | 2430 | struct fs_disk_quota *di) |
1da177e4 LT |
2431 | { |
2432 | struct dquot *dquot; | |
2433 | ||
aca645a6 | 2434 | dquot = dqget(sb, qid); |
dd6f3c6d | 2435 | if (!dquot) |
1da177e4 | 2436 | return -ESRCH; |
1da177e4 LT |
2437 | do_get_dqblk(dquot, di); |
2438 | dqput(dquot); | |
cc33412f | 2439 | |
1da177e4 LT |
2440 | return 0; |
2441 | } | |
287a8095 | 2442 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2443 | |
c472b432 CH |
2444 | #define VFS_FS_DQ_MASK \ |
2445 | (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ | |
2446 | FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ | |
2447 | FS_DQ_BTIMER | FS_DQ_ITIMER) | |
2448 | ||
1da177e4 | 2449 | /* Generic routine for setting common part of quota structure */ |
c472b432 | 2450 | static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2451 | { |
2452 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2453 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2454 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2455 | |
c472b432 CH |
2456 | if (di->d_fieldmask & ~VFS_FS_DQ_MASK) |
2457 | return -EINVAL; | |
2458 | ||
2459 | if (((di->d_fieldmask & FS_DQ_BSOFT) && | |
2460 | (di->d_blk_softlimit > dqi->dqi_maxblimit)) || | |
2461 | ((di->d_fieldmask & FS_DQ_BHARD) && | |
2462 | (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || | |
2463 | ((di->d_fieldmask & FS_DQ_ISOFT) && | |
2464 | (di->d_ino_softlimit > dqi->dqi_maxilimit)) || | |
2465 | ((di->d_fieldmask & FS_DQ_IHARD) && | |
2466 | (di->d_ino_hardlimit > dqi->dqi_maxilimit))) | |
338bf9af | 2467 | return -ERANGE; |
1da177e4 LT |
2468 | |
2469 | spin_lock(&dq_data_lock); | |
c472b432 CH |
2470 | if (di->d_fieldmask & FS_DQ_BCOUNT) { |
2471 | dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; | |
1da177e4 | 2472 | check_blim = 1; |
08261673 | 2473 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2474 | } |
c472b432 CH |
2475 | |
2476 | if (di->d_fieldmask & FS_DQ_BSOFT) | |
2477 | dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); | |
2478 | if (di->d_fieldmask & FS_DQ_BHARD) | |
2479 | dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); | |
2480 | if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { | |
1da177e4 | 2481 | check_blim = 1; |
08261673 | 2482 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2483 | } |
c472b432 CH |
2484 | |
2485 | if (di->d_fieldmask & FS_DQ_ICOUNT) { | |
2486 | dm->dqb_curinodes = di->d_icount; | |
1da177e4 | 2487 | check_ilim = 1; |
08261673 | 2488 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2489 | } |
c472b432 CH |
2490 | |
2491 | if (di->d_fieldmask & FS_DQ_ISOFT) | |
2492 | dm->dqb_isoftlimit = di->d_ino_softlimit; | |
2493 | if (di->d_fieldmask & FS_DQ_IHARD) | |
2494 | dm->dqb_ihardlimit = di->d_ino_hardlimit; | |
2495 | if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { | |
1da177e4 | 2496 | check_ilim = 1; |
08261673 | 2497 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2498 | } |
c472b432 CH |
2499 | |
2500 | if (di->d_fieldmask & FS_DQ_BTIMER) { | |
2501 | dm->dqb_btime = di->d_btimer; | |
e04a88a9 | 2502 | check_blim = 1; |
08261673 | 2503 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2504 | } |
c472b432 CH |
2505 | |
2506 | if (di->d_fieldmask & FS_DQ_ITIMER) { | |
2507 | dm->dqb_itime = di->d_itimer; | |
e04a88a9 | 2508 | check_ilim = 1; |
08261673 | 2509 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2510 | } |
1da177e4 LT |
2511 | |
2512 | if (check_blim) { | |
268157ba JK |
2513 | if (!dm->dqb_bsoftlimit || |
2514 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2515 | dm->dqb_btime = 0; |
2516 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
c472b432 | 2517 | } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) |
268157ba | 2518 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2519 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2520 | } |
2521 | if (check_ilim) { | |
268157ba JK |
2522 | if (!dm->dqb_isoftlimit || |
2523 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2524 | dm->dqb_itime = 0; |
2525 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
c472b432 | 2526 | } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) |
268157ba | 2527 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2528 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2529 | } |
268157ba JK |
2530 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2531 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2532 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2533 | else | |
2534 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2535 | spin_unlock(&dq_data_lock); | |
2536 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2537 | |
2538 | return 0; | |
1da177e4 LT |
2539 | } |
2540 | ||
74a8a103 | 2541 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
c472b432 | 2542 | struct fs_disk_quota *di) |
1da177e4 LT |
2543 | { |
2544 | struct dquot *dquot; | |
338bf9af | 2545 | int rc; |
1da177e4 | 2546 | |
aca645a6 | 2547 | dquot = dqget(sb, qid); |
f55abc0f JK |
2548 | if (!dquot) { |
2549 | rc = -ESRCH; | |
2550 | goto out; | |
1da177e4 | 2551 | } |
338bf9af | 2552 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2553 | dqput(dquot); |
f55abc0f | 2554 | out: |
338bf9af | 2555 | return rc; |
1da177e4 | 2556 | } |
287a8095 | 2557 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2558 | |
2559 | /* Generic routine for getting common part of quota file information */ | |
287a8095 | 2560 | int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) |
1da177e4 LT |
2561 | { |
2562 | struct mem_dqinfo *mi; | |
2563 | ||
d3be915f | 2564 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2565 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2566 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2567 | return -ESRCH; |
2568 | } | |
2569 | mi = sb_dqopt(sb)->info + type; | |
2570 | spin_lock(&dq_data_lock); | |
2571 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2572 | ii->dqi_igrace = mi->dqi_igrace; | |
46fe44ce | 2573 | ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; |
1da177e4 LT |
2574 | ii->dqi_valid = IIF_ALL; |
2575 | spin_unlock(&dq_data_lock); | |
d3be915f | 2576 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2577 | return 0; |
2578 | } | |
287a8095 | 2579 | EXPORT_SYMBOL(dquot_get_dqinfo); |
1da177e4 LT |
2580 | |
2581 | /* Generic routine for setting common part of quota file information */ | |
287a8095 | 2582 | int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) |
1da177e4 LT |
2583 | { |
2584 | struct mem_dqinfo *mi; | |
f55abc0f | 2585 | int err = 0; |
1da177e4 | 2586 | |
d3be915f | 2587 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2588 | if (!sb_has_quota_active(sb, type)) { |
2589 | err = -ESRCH; | |
2590 | goto out; | |
1da177e4 LT |
2591 | } |
2592 | mi = sb_dqopt(sb)->info + type; | |
2593 | spin_lock(&dq_data_lock); | |
2594 | if (ii->dqi_valid & IIF_BGRACE) | |
2595 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2596 | if (ii->dqi_valid & IIF_IGRACE) | |
2597 | mi->dqi_igrace = ii->dqi_igrace; | |
2598 | if (ii->dqi_valid & IIF_FLAGS) | |
46fe44ce JK |
2599 | mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | |
2600 | (ii->dqi_flags & DQF_SETINFO_MASK); | |
1da177e4 LT |
2601 | spin_unlock(&dq_data_lock); |
2602 | mark_info_dirty(sb, type); | |
2603 | /* Force write to disk */ | |
2604 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2605 | out: |
d3be915f | 2606 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2607 | return err; |
1da177e4 | 2608 | } |
287a8095 | 2609 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2610 | |
287a8095 CH |
2611 | const struct quotactl_ops dquot_quotactl_ops = { |
2612 | .quota_on = dquot_quota_on, | |
2613 | .quota_off = dquot_quota_off, | |
2614 | .quota_sync = dquot_quota_sync, | |
2615 | .get_info = dquot_get_dqinfo, | |
2616 | .set_info = dquot_set_dqinfo, | |
2617 | .get_dqblk = dquot_get_dqblk, | |
2618 | .set_dqblk = dquot_set_dqblk | |
1da177e4 | 2619 | }; |
287a8095 | 2620 | EXPORT_SYMBOL(dquot_quotactl_ops); |
dde95888 DM |
2621 | |
2622 | static int do_proc_dqstats(struct ctl_table *table, int write, | |
2623 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2624 | { | |
dde95888 | 2625 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2626 | |
2627 | /* Update global table */ | |
2628 | dqstats.stat[type] = | |
2629 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2630 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2631 | } | |
2632 | ||
e628753b | 2633 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2634 | { |
1da177e4 | 2635 | .procname = "lookups", |
dde95888 | 2636 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2637 | .maxlen = sizeof(int), |
2638 | .mode = 0444, | |
dde95888 | 2639 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2640 | }, |
2641 | { | |
1da177e4 | 2642 | .procname = "drops", |
dde95888 | 2643 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2644 | .maxlen = sizeof(int), |
2645 | .mode = 0444, | |
dde95888 | 2646 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2647 | }, |
2648 | { | |
1da177e4 | 2649 | .procname = "reads", |
dde95888 | 2650 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2651 | .maxlen = sizeof(int), |
2652 | .mode = 0444, | |
dde95888 | 2653 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2654 | }, |
2655 | { | |
1da177e4 | 2656 | .procname = "writes", |
dde95888 | 2657 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2658 | .maxlen = sizeof(int), |
2659 | .mode = 0444, | |
dde95888 | 2660 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2661 | }, |
2662 | { | |
1da177e4 | 2663 | .procname = "cache_hits", |
dde95888 | 2664 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2665 | .maxlen = sizeof(int), |
2666 | .mode = 0444, | |
dde95888 | 2667 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2668 | }, |
2669 | { | |
1da177e4 | 2670 | .procname = "allocated_dquots", |
dde95888 | 2671 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2672 | .maxlen = sizeof(int), |
2673 | .mode = 0444, | |
dde95888 | 2674 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2675 | }, |
2676 | { | |
1da177e4 | 2677 | .procname = "free_dquots", |
dde95888 | 2678 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2679 | .maxlen = sizeof(int), |
2680 | .mode = 0444, | |
dde95888 | 2681 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2682 | }, |
2683 | { | |
1da177e4 | 2684 | .procname = "syncs", |
dde95888 | 2685 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2686 | .maxlen = sizeof(int), |
2687 | .mode = 0444, | |
dde95888 | 2688 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2689 | }, |
8e893469 | 2690 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2691 | { |
1da177e4 LT |
2692 | .procname = "warnings", |
2693 | .data = &flag_print_warnings, | |
2694 | .maxlen = sizeof(int), | |
2695 | .mode = 0644, | |
6d456111 | 2696 | .proc_handler = proc_dointvec, |
1da177e4 | 2697 | }, |
8e893469 | 2698 | #endif |
ab09203e | 2699 | { }, |
1da177e4 LT |
2700 | }; |
2701 | ||
e628753b | 2702 | static struct ctl_table fs_table[] = { |
1da177e4 | 2703 | { |
1da177e4 LT |
2704 | .procname = "quota", |
2705 | .mode = 0555, | |
2706 | .child = fs_dqstats_table, | |
2707 | }, | |
ab09203e | 2708 | { }, |
1da177e4 LT |
2709 | }; |
2710 | ||
e628753b | 2711 | static struct ctl_table sys_table[] = { |
1da177e4 | 2712 | { |
1da177e4 LT |
2713 | .procname = "fs", |
2714 | .mode = 0555, | |
2715 | .child = fs_table, | |
2716 | }, | |
ab09203e | 2717 | { }, |
1da177e4 LT |
2718 | }; |
2719 | ||
2720 | static int __init dquot_init(void) | |
2721 | { | |
f32764bd | 2722 | int i, ret; |
1da177e4 LT |
2723 | unsigned long nr_hash, order; |
2724 | ||
2725 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2726 | ||
0b4d4147 | 2727 | register_sysctl_table(sys_table); |
1da177e4 | 2728 | |
20c2df83 | 2729 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2730 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2731 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2732 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2733 | NULL); |
1da177e4 LT |
2734 | |
2735 | order = 0; | |
2736 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2737 | if (!dquot_hash) | |
2738 | panic("Cannot create dquot hash table"); | |
2739 | ||
f32764bd DM |
2740 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
2741 | ret = percpu_counter_init(&dqstats.counter[i], 0); | |
2742 | if (ret) | |
2743 | panic("Cannot create dquot stat counters"); | |
2744 | } | |
dde95888 | 2745 | |
1da177e4 LT |
2746 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2747 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2748 | dq_hash_bits = 0; | |
2749 | do { | |
2750 | dq_hash_bits++; | |
2751 | } while (nr_hash >> dq_hash_bits); | |
2752 | dq_hash_bits--; | |
2753 | ||
2754 | nr_hash = 1UL << dq_hash_bits; | |
2755 | dq_hash_mask = nr_hash - 1; | |
2756 | for (i = 0; i < nr_hash; i++) | |
2757 | INIT_HLIST_HEAD(dquot_hash + i); | |
2758 | ||
2759 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2760 | nr_hash, order, (PAGE_SIZE << order)); | |
2761 | ||
8e1f936b | 2762 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2763 | |
2764 | return 0; | |
2765 | } | |
2766 | module_init(dquot_init); |