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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
74 | #include <linux/kmod.h> | |
75 | #include <linux/namei.h> | |
76 | #include <linux/buffer_head.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
fb58b731 | 79 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
1da177e4 LT |
80 | |
81 | #include <asm/uaccess.h> | |
82 | ||
83 | #define __DQUOT_PARANOIA | |
84 | ||
85 | /* | |
cc33412f JK |
86 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
87 | * and quota formats, dqstats structure containing statistics about the lists | |
88 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and | |
89 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 90 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
91 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
92 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
93 | * about latest values take it as well. | |
1da177e4 | 94 | * |
cc33412f JK |
95 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
96 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
97 | * |
98 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
99 | * the life of the dquot structure and so needn't to be protected by a lock | |
100 | * | |
101 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
102 | * operation is just reading pointers from inode (or not using them at all) the | |
26245c94 JK |
103 | * read lock is enough. If pointers are altered function must hold write lock. |
104 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that | |
105 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
106 | * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they | |
107 | * have to do all pointer modifications before dropping dqptr_sem. This makes | |
108 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and | |
109 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 110 | * |
d3be915f | 111 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
112 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
113 | * Currently dquot is locked only when it is being read to memory (or space for | |
114 | * it is being allocated) on the first dqget() and when it is being released on | |
115 | * the last dqput(). The allocation and release oparations are serialized by | |
116 | * the dq_lock and by checking the use count in dquot_release(). Write | |
117 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
118 | * spinlock to internal buffers before writing. | |
119 | * | |
120 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
121 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
122 | * dqio_mutex | |
cc33412f JK |
123 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
124 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
125 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
126 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
127 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
128 | * called with dqptr_sem held. | |
d3be915f | 129 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
130 | */ |
131 | ||
c516610c JK |
132 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
133 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
134 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 135 | EXPORT_SYMBOL(dq_data_lock); |
1da177e4 LT |
136 | |
137 | static char *quotatypes[] = INITQFNAMES; | |
138 | static struct quota_format_type *quota_formats; /* List of registered formats */ | |
139 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
140 | ||
141 | /* SLAB cache for dquot structures */ | |
e18b890b | 142 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
143 | |
144 | int register_quota_format(struct quota_format_type *fmt) | |
145 | { | |
146 | spin_lock(&dq_list_lock); | |
147 | fmt->qf_next = quota_formats; | |
148 | quota_formats = fmt; | |
149 | spin_unlock(&dq_list_lock); | |
150 | return 0; | |
151 | } | |
08d0350c | 152 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
153 | |
154 | void unregister_quota_format(struct quota_format_type *fmt) | |
155 | { | |
156 | struct quota_format_type **actqf; | |
157 | ||
158 | spin_lock(&dq_list_lock); | |
268157ba JK |
159 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
160 | actqf = &(*actqf)->qf_next) | |
161 | ; | |
1da177e4 LT |
162 | if (*actqf) |
163 | *actqf = (*actqf)->qf_next; | |
164 | spin_unlock(&dq_list_lock); | |
165 | } | |
08d0350c | 166 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
167 | |
168 | static struct quota_format_type *find_quota_format(int id) | |
169 | { | |
170 | struct quota_format_type *actqf; | |
171 | ||
172 | spin_lock(&dq_list_lock); | |
268157ba JK |
173 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
174 | actqf = actqf->qf_next) | |
175 | ; | |
1da177e4 LT |
176 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
177 | int qm; | |
178 | ||
179 | spin_unlock(&dq_list_lock); | |
180 | ||
268157ba JK |
181 | for (qm = 0; module_names[qm].qm_fmt_id && |
182 | module_names[qm].qm_fmt_id != id; qm++) | |
183 | ; | |
184 | if (!module_names[qm].qm_fmt_id || | |
185 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
186 | return NULL; |
187 | ||
188 | spin_lock(&dq_list_lock); | |
268157ba JK |
189 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
190 | actqf = actqf->qf_next) | |
191 | ; | |
1da177e4 LT |
192 | if (actqf && !try_module_get(actqf->qf_owner)) |
193 | actqf = NULL; | |
194 | } | |
195 | spin_unlock(&dq_list_lock); | |
196 | return actqf; | |
197 | } | |
198 | ||
199 | static void put_quota_format(struct quota_format_type *fmt) | |
200 | { | |
201 | module_put(fmt->qf_owner); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Dquot List Management: | |
206 | * The quota code uses three lists for dquot management: the inuse_list, | |
207 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
208 | * on all three lists, depending on its current state. | |
209 | * | |
210 | * All dquots are placed to the end of inuse_list when first created, and this | |
211 | * list is used for invalidate operation, which must look at every dquot. | |
212 | * | |
213 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
214 | * and this list is searched whenever we need an available dquot. Dquots are | |
215 | * removed from the list as soon as they are used again, and | |
216 | * dqstats.free_dquots gives the number of dquots on the list. When | |
217 | * dquot is invalidated it's completely released from memory. | |
218 | * | |
219 | * Dquots with a specific identity (device, type and id) are placed on | |
220 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
221 | * mechanism to locate a specific dquot. | |
222 | */ | |
223 | ||
224 | static LIST_HEAD(inuse_list); | |
225 | static LIST_HEAD(free_dquots); | |
226 | static unsigned int dq_hash_bits, dq_hash_mask; | |
227 | static struct hlist_head *dquot_hash; | |
228 | ||
229 | struct dqstats dqstats; | |
08d0350c | 230 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 231 | |
0a5a9c72 | 232 | static qsize_t inode_get_rsv_space(struct inode *inode); |
871a2931 | 233 | static void __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 234 | |
1da177e4 LT |
235 | static inline unsigned int |
236 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
237 | { | |
238 | unsigned long tmp; | |
239 | ||
240 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
241 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Following list functions expect dq_list_lock to be held | |
246 | */ | |
247 | static inline void insert_dquot_hash(struct dquot *dquot) | |
248 | { | |
268157ba JK |
249 | struct hlist_head *head; |
250 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
1da177e4 LT |
251 | hlist_add_head(&dquot->dq_hash, head); |
252 | } | |
253 | ||
254 | static inline void remove_dquot_hash(struct dquot *dquot) | |
255 | { | |
256 | hlist_del_init(&dquot->dq_hash); | |
257 | } | |
258 | ||
7a2435d8 JK |
259 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
260 | unsigned int id, int type) | |
1da177e4 LT |
261 | { |
262 | struct hlist_node *node; | |
263 | struct dquot *dquot; | |
264 | ||
265 | hlist_for_each (node, dquot_hash+hashent) { | |
266 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
268157ba JK |
267 | if (dquot->dq_sb == sb && dquot->dq_id == id && |
268 | dquot->dq_type == type) | |
1da177e4 LT |
269 | return dquot; |
270 | } | |
dd6f3c6d | 271 | return NULL; |
1da177e4 LT |
272 | } |
273 | ||
274 | /* Add a dquot to the tail of the free list */ | |
275 | static inline void put_dquot_last(struct dquot *dquot) | |
276 | { | |
8e13059a | 277 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
278 | dqstats.free_dquots++; |
279 | } | |
280 | ||
281 | static inline void remove_free_dquot(struct dquot *dquot) | |
282 | { | |
283 | if (list_empty(&dquot->dq_free)) | |
284 | return; | |
285 | list_del_init(&dquot->dq_free); | |
286 | dqstats.free_dquots--; | |
287 | } | |
288 | ||
289 | static inline void put_inuse(struct dquot *dquot) | |
290 | { | |
291 | /* We add to the back of inuse list so we don't have to restart | |
292 | * when traversing this list and we block */ | |
8e13059a | 293 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
294 | dqstats.allocated_dquots++; |
295 | } | |
296 | ||
297 | static inline void remove_inuse(struct dquot *dquot) | |
298 | { | |
299 | dqstats.allocated_dquots--; | |
300 | list_del(&dquot->dq_inuse); | |
301 | } | |
302 | /* | |
303 | * End of list functions needing dq_list_lock | |
304 | */ | |
305 | ||
306 | static void wait_on_dquot(struct dquot *dquot) | |
307 | { | |
d3be915f IM |
308 | mutex_lock(&dquot->dq_lock); |
309 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
310 | } |
311 | ||
03f6e92b JK |
312 | static inline int dquot_dirty(struct dquot *dquot) |
313 | { | |
314 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
315 | } | |
316 | ||
317 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
318 | { | |
319 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
320 | } | |
1da177e4 LT |
321 | |
322 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
323 | { | |
324 | spin_lock(&dq_list_lock); | |
325 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
326 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
327 | info[dquot->dq_type].dqi_dirty_list); | |
328 | spin_unlock(&dq_list_lock); | |
329 | return 0; | |
330 | } | |
08d0350c | 331 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 332 | |
dc52dd3a DM |
333 | /* Dirtify all the dquots - this can block when journalling */ |
334 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
335 | { | |
336 | int ret, err, cnt; | |
337 | ||
338 | ret = err = 0; | |
339 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
340 | if (dquot[cnt]) | |
341 | /* Even in case of error we have to continue */ | |
342 | ret = mark_dquot_dirty(dquot[cnt]); | |
343 | if (!err) | |
344 | err = ret; | |
345 | } | |
346 | return err; | |
347 | } | |
348 | ||
349 | static inline void dqput_all(struct dquot **dquot) | |
350 | { | |
351 | unsigned int cnt; | |
352 | ||
353 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
354 | dqput(dquot[cnt]); | |
355 | } | |
356 | ||
1da177e4 LT |
357 | /* This function needs dq_list_lock */ |
358 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
359 | { | |
360 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
361 | return 0; | |
362 | list_del_init(&dquot->dq_dirty); | |
363 | return 1; | |
364 | } | |
365 | ||
366 | void mark_info_dirty(struct super_block *sb, int type) | |
367 | { | |
368 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
369 | } | |
370 | EXPORT_SYMBOL(mark_info_dirty); | |
371 | ||
372 | /* | |
373 | * Read dquot from disk and alloc space for it | |
374 | */ | |
375 | ||
376 | int dquot_acquire(struct dquot *dquot) | |
377 | { | |
378 | int ret = 0, ret2 = 0; | |
379 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
380 | ||
d3be915f IM |
381 | mutex_lock(&dquot->dq_lock); |
382 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
383 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
384 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
385 | if (ret < 0) | |
386 | goto out_iolock; | |
387 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
388 | /* Instantiate dquot if needed */ | |
389 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
390 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
391 | /* Write the info if needed */ | |
268157ba JK |
392 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
393 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
394 | dquot->dq_sb, dquot->dq_type); | |
395 | } | |
1da177e4 LT |
396 | if (ret < 0) |
397 | goto out_iolock; | |
398 | if (ret2 < 0) { | |
399 | ret = ret2; | |
400 | goto out_iolock; | |
401 | } | |
402 | } | |
403 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
404 | out_iolock: | |
d3be915f IM |
405 | mutex_unlock(&dqopt->dqio_mutex); |
406 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
407 | return ret; |
408 | } | |
08d0350c | 409 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
410 | |
411 | /* | |
412 | * Write dquot to disk | |
413 | */ | |
414 | int dquot_commit(struct dquot *dquot) | |
415 | { | |
416 | int ret = 0, ret2 = 0; | |
417 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
418 | ||
d3be915f | 419 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
420 | spin_lock(&dq_list_lock); |
421 | if (!clear_dquot_dirty(dquot)) { | |
422 | spin_unlock(&dq_list_lock); | |
423 | goto out_sem; | |
424 | } | |
425 | spin_unlock(&dq_list_lock); | |
426 | /* Inactive dquot can be only if there was error during read/init | |
427 | * => we have better not writing it */ | |
428 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
429 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
268157ba JK |
430 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
431 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
432 | dquot->dq_sb, dquot->dq_type); | |
433 | } | |
1da177e4 LT |
434 | if (ret >= 0) |
435 | ret = ret2; | |
436 | } | |
437 | out_sem: | |
d3be915f | 438 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
439 | return ret; |
440 | } | |
08d0350c | 441 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
442 | |
443 | /* | |
444 | * Release dquot | |
445 | */ | |
446 | int dquot_release(struct dquot *dquot) | |
447 | { | |
448 | int ret = 0, ret2 = 0; | |
449 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
450 | ||
d3be915f | 451 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
452 | /* Check whether we are not racing with some other dqget() */ |
453 | if (atomic_read(&dquot->dq_count) > 1) | |
454 | goto out_dqlock; | |
d3be915f | 455 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
456 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
457 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
458 | /* Write the info */ | |
268157ba JK |
459 | if (info_dirty(&dqopt->info[dquot->dq_type])) { |
460 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info( | |
461 | dquot->dq_sb, dquot->dq_type); | |
462 | } | |
1da177e4 LT |
463 | if (ret >= 0) |
464 | ret = ret2; | |
465 | } | |
466 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 467 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 468 | out_dqlock: |
d3be915f | 469 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
470 | return ret; |
471 | } | |
08d0350c | 472 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 473 | |
7d9056ba | 474 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
475 | { |
476 | kmem_cache_free(dquot_cachep, dquot); | |
477 | } | |
7d9056ba | 478 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
479 | |
480 | static inline void do_destroy_dquot(struct dquot *dquot) | |
481 | { | |
482 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* Invalidate all dquots on the list. Note that this function is called after |
486 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
487 | * quota users. There can still be some users of quotas due to inodes being |
488 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 489 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 490 | */ |
1da177e4 LT |
491 | static void invalidate_dquots(struct super_block *sb, int type) |
492 | { | |
c33ed271 | 493 | struct dquot *dquot, *tmp; |
1da177e4 | 494 | |
6362e4d4 | 495 | restart: |
1da177e4 | 496 | spin_lock(&dq_list_lock); |
c33ed271 | 497 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
498 | if (dquot->dq_sb != sb) |
499 | continue; | |
500 | if (dquot->dq_type != type) | |
501 | continue; | |
6362e4d4 JK |
502 | /* Wait for dquot users */ |
503 | if (atomic_read(&dquot->dq_count)) { | |
504 | DEFINE_WAIT(wait); | |
505 | ||
506 | atomic_inc(&dquot->dq_count); | |
507 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
508 | TASK_UNINTERRUPTIBLE); | |
509 | spin_unlock(&dq_list_lock); | |
510 | /* Once dqput() wakes us up, we know it's time to free | |
511 | * the dquot. | |
512 | * IMPORTANT: we rely on the fact that there is always | |
513 | * at most one process waiting for dquot to free. | |
514 | * Otherwise dq_count would be > 1 and we would never | |
515 | * wake up. | |
516 | */ | |
517 | if (atomic_read(&dquot->dq_count) > 1) | |
518 | schedule(); | |
519 | finish_wait(&dquot->dq_wait_unused, &wait); | |
520 | dqput(dquot); | |
521 | /* At this moment dquot() need not exist (it could be | |
522 | * reclaimed by prune_dqcache(). Hence we must | |
523 | * restart. */ | |
524 | goto restart; | |
525 | } | |
526 | /* | |
527 | * Quota now has no users and it has been written on last | |
528 | * dqput() | |
529 | */ | |
1da177e4 LT |
530 | remove_dquot_hash(dquot); |
531 | remove_free_dquot(dquot); | |
532 | remove_inuse(dquot); | |
74f783af | 533 | do_destroy_dquot(dquot); |
1da177e4 LT |
534 | } |
535 | spin_unlock(&dq_list_lock); | |
536 | } | |
537 | ||
12c77527 JK |
538 | /* Call callback for every active dquot on given filesystem */ |
539 | int dquot_scan_active(struct super_block *sb, | |
540 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
541 | unsigned long priv) | |
542 | { | |
543 | struct dquot *dquot, *old_dquot = NULL; | |
544 | int ret = 0; | |
545 | ||
546 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
547 | spin_lock(&dq_list_lock); | |
548 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
549 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
550 | continue; | |
551 | if (dquot->dq_sb != sb) | |
552 | continue; | |
553 | /* Now we have active dquot so we can just increase use count */ | |
554 | atomic_inc(&dquot->dq_count); | |
555 | dqstats.lookups++; | |
556 | spin_unlock(&dq_list_lock); | |
557 | dqput(old_dquot); | |
558 | old_dquot = dquot; | |
559 | ret = fn(dquot, priv); | |
560 | if (ret < 0) | |
561 | goto out; | |
562 | spin_lock(&dq_list_lock); | |
563 | /* We are safe to continue now because our dquot could not | |
564 | * be moved out of the inuse list while we hold the reference */ | |
565 | } | |
566 | spin_unlock(&dq_list_lock); | |
567 | out: | |
568 | dqput(old_dquot); | |
569 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
570 | return ret; | |
571 | } | |
08d0350c | 572 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 573 | |
5fb324ad | 574 | int vfs_quota_sync(struct super_block *sb, int type, int wait) |
1da177e4 LT |
575 | { |
576 | struct list_head *dirty; | |
577 | struct dquot *dquot; | |
578 | struct quota_info *dqopt = sb_dqopt(sb); | |
579 | int cnt; | |
580 | ||
d3be915f | 581 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
582 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
583 | if (type != -1 && cnt != type) | |
584 | continue; | |
f55abc0f | 585 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
586 | continue; |
587 | spin_lock(&dq_list_lock); | |
588 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
589 | while (!list_empty(dirty)) { | |
268157ba JK |
590 | dquot = list_first_entry(dirty, struct dquot, |
591 | dq_dirty); | |
1da177e4 LT |
592 | /* Dirty and inactive can be only bad dquot... */ |
593 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
594 | clear_dquot_dirty(dquot); | |
595 | continue; | |
596 | } | |
597 | /* Now we have active dquot from which someone is | |
598 | * holding reference so we can safely just increase | |
599 | * use count */ | |
600 | atomic_inc(&dquot->dq_count); | |
601 | dqstats.lookups++; | |
602 | spin_unlock(&dq_list_lock); | |
603 | sb->dq_op->write_dquot(dquot); | |
604 | dqput(dquot); | |
605 | spin_lock(&dq_list_lock); | |
606 | } | |
607 | spin_unlock(&dq_list_lock); | |
608 | } | |
609 | ||
610 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
611 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
612 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 LT |
613 | sb->dq_op->write_info(sb, cnt); |
614 | spin_lock(&dq_list_lock); | |
615 | dqstats.syncs++; | |
616 | spin_unlock(&dq_list_lock); | |
d3be915f | 617 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 618 | |
5fb324ad CH |
619 | if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) |
620 | return 0; | |
621 | ||
622 | /* This is not very clever (and fast) but currently I don't know about | |
623 | * any other simple way of getting quota data to disk and we must get | |
624 | * them there for userspace to be visible... */ | |
625 | if (sb->s_op->sync_fs) | |
626 | sb->s_op->sync_fs(sb, 1); | |
627 | sync_blockdev(sb->s_bdev); | |
628 | ||
629 | /* | |
630 | * Now when everything is written we can discard the pagecache so | |
631 | * that userspace sees the changes. | |
632 | */ | |
633 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
634 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
635 | if (type != -1 && cnt != type) | |
636 | continue; | |
637 | if (!sb_has_quota_active(sb, cnt)) | |
638 | continue; | |
639 | mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, | |
640 | I_MUTEX_QUOTA); | |
641 | truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); | |
642 | mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); | |
643 | } | |
644 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
645 | ||
1da177e4 LT |
646 | return 0; |
647 | } | |
08d0350c | 648 | EXPORT_SYMBOL(vfs_quota_sync); |
1da177e4 LT |
649 | |
650 | /* Free unused dquots from cache */ | |
651 | static void prune_dqcache(int count) | |
652 | { | |
653 | struct list_head *head; | |
654 | struct dquot *dquot; | |
655 | ||
656 | head = free_dquots.prev; | |
657 | while (head != &free_dquots && count) { | |
658 | dquot = list_entry(head, struct dquot, dq_free); | |
659 | remove_dquot_hash(dquot); | |
660 | remove_free_dquot(dquot); | |
661 | remove_inuse(dquot); | |
74f783af | 662 | do_destroy_dquot(dquot); |
1da177e4 LT |
663 | count--; |
664 | head = free_dquots.prev; | |
665 | } | |
666 | } | |
667 | ||
668 | /* | |
669 | * This is called from kswapd when we think we need some | |
670 | * more memory | |
671 | */ | |
672 | ||
27496a8c | 673 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
674 | { |
675 | if (nr) { | |
676 | spin_lock(&dq_list_lock); | |
677 | prune_dqcache(nr); | |
678 | spin_unlock(&dq_list_lock); | |
679 | } | |
680 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
681 | } | |
682 | ||
8e1f936b RR |
683 | static struct shrinker dqcache_shrinker = { |
684 | .shrink = shrink_dqcache_memory, | |
685 | .seeks = DEFAULT_SEEKS, | |
686 | }; | |
687 | ||
1da177e4 LT |
688 | /* |
689 | * Put reference to dquot | |
690 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 691 | */ |
3d9ea253 | 692 | void dqput(struct dquot *dquot) |
1da177e4 | 693 | { |
b48d3805 JK |
694 | int ret; |
695 | ||
1da177e4 LT |
696 | if (!dquot) |
697 | return; | |
698 | #ifdef __DQUOT_PARANOIA | |
699 | if (!atomic_read(&dquot->dq_count)) { | |
700 | printk("VFS: dqput: trying to free free dquot\n"); | |
701 | printk("VFS: device %s, dquot of %s %d\n", | |
702 | dquot->dq_sb->s_id, | |
703 | quotatypes[dquot->dq_type], | |
704 | dquot->dq_id); | |
705 | BUG(); | |
706 | } | |
707 | #endif | |
708 | ||
709 | spin_lock(&dq_list_lock); | |
710 | dqstats.drops++; | |
711 | spin_unlock(&dq_list_lock); | |
712 | we_slept: | |
713 | spin_lock(&dq_list_lock); | |
714 | if (atomic_read(&dquot->dq_count) > 1) { | |
715 | /* We have more than one user... nothing to do */ | |
716 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 717 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 718 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
719 | atomic_read(&dquot->dq_count) == 1) |
720 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
721 | spin_unlock(&dq_list_lock); |
722 | return; | |
723 | } | |
724 | /* Need to release dquot? */ | |
725 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
726 | spin_unlock(&dq_list_lock); | |
727 | /* Commit dquot before releasing */ | |
b48d3805 JK |
728 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
729 | if (ret < 0) { | |
730 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
731 | "device %s (error %d). Quota may get out of " | |
732 | "sync!\n", dquot->dq_sb->s_id, ret); | |
733 | /* | |
734 | * We clear dirty bit anyway, so that we avoid | |
735 | * infinite loop here | |
736 | */ | |
737 | spin_lock(&dq_list_lock); | |
738 | clear_dquot_dirty(dquot); | |
739 | spin_unlock(&dq_list_lock); | |
740 | } | |
1da177e4 LT |
741 | goto we_slept; |
742 | } | |
743 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
744 | clear_dquot_dirty(dquot); | |
745 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
746 | spin_unlock(&dq_list_lock); | |
747 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
748 | goto we_slept; | |
749 | } | |
750 | atomic_dec(&dquot->dq_count); | |
751 | #ifdef __DQUOT_PARANOIA | |
752 | /* sanity check */ | |
8abf6a47 | 753 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
754 | #endif |
755 | put_dquot_last(dquot); | |
756 | spin_unlock(&dq_list_lock); | |
757 | } | |
08d0350c | 758 | EXPORT_SYMBOL(dqput); |
1da177e4 | 759 | |
7d9056ba | 760 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
761 | { |
762 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
763 | } | |
7d9056ba | 764 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 765 | |
1da177e4 LT |
766 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
767 | { | |
768 | struct dquot *dquot; | |
769 | ||
74f783af | 770 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 771 | if(!dquot) |
dd6f3c6d | 772 | return NULL; |
1da177e4 | 773 | |
d3be915f | 774 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
775 | INIT_LIST_HEAD(&dquot->dq_free); |
776 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
777 | INIT_HLIST_NODE(&dquot->dq_hash); | |
778 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 779 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
780 | dquot->dq_sb = sb; |
781 | dquot->dq_type = type; | |
782 | atomic_set(&dquot->dq_count, 1); | |
783 | ||
784 | return dquot; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Get reference to dquot | |
cc33412f JK |
789 | * |
790 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
791 | * destroying our dquot by: | |
792 | * a) checking for quota flags under dq_list_lock and | |
793 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 794 | */ |
3d9ea253 | 795 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
796 | { |
797 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 798 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 799 | |
f55abc0f | 800 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 801 | return NULL; |
1da177e4 LT |
802 | we_slept: |
803 | spin_lock(&dq_list_lock); | |
cc33412f JK |
804 | spin_lock(&dq_state_lock); |
805 | if (!sb_has_quota_active(sb, type)) { | |
806 | spin_unlock(&dq_state_lock); | |
807 | spin_unlock(&dq_list_lock); | |
808 | goto out; | |
809 | } | |
810 | spin_unlock(&dq_state_lock); | |
811 | ||
dd6f3c6d JK |
812 | dquot = find_dquot(hashent, sb, id, type); |
813 | if (!dquot) { | |
814 | if (!empty) { | |
1da177e4 | 815 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
816 | empty = get_empty_dquot(sb, type); |
817 | if (!empty) | |
1da177e4 LT |
818 | schedule(); /* Try to wait for a moment... */ |
819 | goto we_slept; | |
820 | } | |
821 | dquot = empty; | |
dd6f3c6d | 822 | empty = NULL; |
1da177e4 LT |
823 | dquot->dq_id = id; |
824 | /* all dquots go on the inuse_list */ | |
825 | put_inuse(dquot); | |
826 | /* hash it first so it can be found */ | |
827 | insert_dquot_hash(dquot); | |
828 | dqstats.lookups++; | |
829 | spin_unlock(&dq_list_lock); | |
830 | } else { | |
831 | if (!atomic_read(&dquot->dq_count)) | |
832 | remove_free_dquot(dquot); | |
833 | atomic_inc(&dquot->dq_count); | |
834 | dqstats.cache_hits++; | |
835 | dqstats.lookups++; | |
836 | spin_unlock(&dq_list_lock); | |
1da177e4 | 837 | } |
268157ba JK |
838 | /* Wait for dq_lock - after this we know that either dquot_release() is |
839 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 840 | wait_on_dquot(dquot); |
268157ba JK |
841 | /* Read the dquot / allocate space in quota file */ |
842 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
843 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 844 | dqput(dquot); |
dd6f3c6d | 845 | dquot = NULL; |
cc33412f | 846 | goto out; |
1da177e4 LT |
847 | } |
848 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 849 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 850 | #endif |
cc33412f JK |
851 | out: |
852 | if (empty) | |
853 | do_destroy_dquot(empty); | |
1da177e4 LT |
854 | |
855 | return dquot; | |
856 | } | |
08d0350c | 857 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
858 | |
859 | static int dqinit_needed(struct inode *inode, int type) | |
860 | { | |
861 | int cnt; | |
862 | ||
863 | if (IS_NOQUOTA(inode)) | |
864 | return 0; | |
865 | if (type != -1) | |
dd6f3c6d | 866 | return !inode->i_dquot[type]; |
1da177e4 | 867 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 868 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
869 | return 1; |
870 | return 0; | |
871 | } | |
872 | ||
d3be915f | 873 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
874 | static void add_dquot_ref(struct super_block *sb, int type) |
875 | { | |
941d2380 | 876 | struct inode *inode, *old_inode = NULL; |
0a5a9c72 | 877 | int reserved = 0; |
1da177e4 | 878 | |
d003fb70 CH |
879 | spin_lock(&inode_lock); |
880 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
b6fac63c | 881 | if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) |
aabb8fdb | 882 | continue; |
0a5a9c72 JK |
883 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
884 | reserved = 1; | |
d003fb70 CH |
885 | if (!atomic_read(&inode->i_writecount)) |
886 | continue; | |
887 | if (!dqinit_needed(inode, type)) | |
888 | continue; | |
d003fb70 CH |
889 | |
890 | __iget(inode); | |
891 | spin_unlock(&inode_lock); | |
892 | ||
941d2380 | 893 | iput(old_inode); |
871a2931 | 894 | __dquot_initialize(inode, type); |
941d2380 JK |
895 | /* We hold a reference to 'inode' so it couldn't have been |
896 | * removed from s_inodes list while we dropped the inode_lock. | |
897 | * We cannot iput the inode now as we can be holding the last | |
898 | * reference and we cannot iput it under inode_lock. So we | |
899 | * keep the reference and iput it later. */ | |
900 | old_inode = inode; | |
901 | spin_lock(&inode_lock); | |
1da177e4 | 902 | } |
d003fb70 | 903 | spin_unlock(&inode_lock); |
941d2380 | 904 | iput(old_inode); |
0a5a9c72 JK |
905 | |
906 | if (reserved) { | |
907 | printk(KERN_WARNING "VFS (%s): Writes happened before quota" | |
908 | " was turned on thus quota information is probably " | |
909 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
910 | } | |
1da177e4 LT |
911 | } |
912 | ||
268157ba JK |
913 | /* |
914 | * Return 0 if dqput() won't block. | |
915 | * (note that 1 doesn't necessarily mean blocking) | |
916 | */ | |
1da177e4 LT |
917 | static inline int dqput_blocks(struct dquot *dquot) |
918 | { | |
919 | if (atomic_read(&dquot->dq_count) <= 1) | |
920 | return 1; | |
921 | return 0; | |
922 | } | |
923 | ||
268157ba JK |
924 | /* |
925 | * Remove references to dquots from inode and add dquot to list for freeing | |
926 | * if we have the last referece to dquot | |
927 | * We can't race with anybody because we hold dqptr_sem for writing... | |
928 | */ | |
e5f00f42 AB |
929 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
930 | struct list_head *tofree_head) | |
1da177e4 LT |
931 | { |
932 | struct dquot *dquot = inode->i_dquot[type]; | |
933 | ||
dd6f3c6d JK |
934 | inode->i_dquot[type] = NULL; |
935 | if (dquot) { | |
1da177e4 LT |
936 | if (dqput_blocks(dquot)) { |
937 | #ifdef __DQUOT_PARANOIA | |
938 | if (atomic_read(&dquot->dq_count) != 1) | |
939 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
940 | #endif | |
941 | spin_lock(&dq_list_lock); | |
268157ba JK |
942 | /* As dquot must have currently users it can't be on |
943 | * the free list... */ | |
944 | list_add(&dquot->dq_free, tofree_head); | |
1da177e4 LT |
945 | spin_unlock(&dq_list_lock); |
946 | return 1; | |
947 | } | |
948 | else | |
949 | dqput(dquot); /* We have guaranteed we won't block */ | |
950 | } | |
951 | return 0; | |
952 | } | |
953 | ||
268157ba JK |
954 | /* |
955 | * Free list of dquots | |
956 | * Dquots are removed from inodes and no new references can be got so we are | |
957 | * the only ones holding reference | |
958 | */ | |
1da177e4 LT |
959 | static void put_dquot_list(struct list_head *tofree_head) |
960 | { | |
961 | struct list_head *act_head; | |
962 | struct dquot *dquot; | |
963 | ||
964 | act_head = tofree_head->next; | |
1da177e4 LT |
965 | while (act_head != tofree_head) { |
966 | dquot = list_entry(act_head, struct dquot, dq_free); | |
967 | act_head = act_head->next; | |
268157ba JK |
968 | /* Remove dquot from the list so we won't have problems... */ |
969 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
970 | dqput(dquot); |
971 | } | |
972 | } | |
973 | ||
fb58b731 CH |
974 | static void remove_dquot_ref(struct super_block *sb, int type, |
975 | struct list_head *tofree_head) | |
976 | { | |
977 | struct inode *inode; | |
978 | ||
979 | spin_lock(&inode_lock); | |
980 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
aabb8fdb NP |
981 | /* |
982 | * We have to scan also I_NEW inodes because they can already | |
983 | * have quota pointer initialized. Luckily, we need to touch | |
984 | * only quota pointers and these have separate locking | |
985 | * (dqptr_sem). | |
986 | */ | |
fb58b731 CH |
987 | if (!IS_NOQUOTA(inode)) |
988 | remove_inode_dquot_ref(inode, type, tofree_head); | |
989 | } | |
990 | spin_unlock(&inode_lock); | |
991 | } | |
992 | ||
1da177e4 LT |
993 | /* Gather all references from inodes and drop them */ |
994 | static void drop_dquot_ref(struct super_block *sb, int type) | |
995 | { | |
996 | LIST_HEAD(tofree_head); | |
997 | ||
fb58b731 CH |
998 | if (sb->dq_op) { |
999 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1000 | remove_dquot_ref(sb, type, &tofree_head); | |
1001 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
1002 | put_dquot_list(&tofree_head); | |
1003 | } | |
1da177e4 LT |
1004 | } |
1005 | ||
12095460 | 1006 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1007 | { |
1008 | dquot->dq_dqb.dqb_curinodes += number; | |
1009 | } | |
1010 | ||
1011 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1012 | { | |
1013 | dquot->dq_dqb.dqb_curspace += number; | |
1014 | } | |
1015 | ||
f18df228 MC |
1016 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1017 | { | |
1018 | dquot->dq_dqb.dqb_rsvspace += number; | |
1019 | } | |
1020 | ||
740d9dcd MC |
1021 | /* |
1022 | * Claim reserved quota space | |
1023 | */ | |
0a5a9c72 | 1024 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1025 | { |
0a5a9c72 JK |
1026 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1027 | WARN_ON_ONCE(1); | |
1028 | number = dquot->dq_dqb.dqb_rsvspace; | |
1029 | } | |
740d9dcd MC |
1030 | dquot->dq_dqb.dqb_curspace += number; |
1031 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1032 | } | |
1033 | ||
1034 | static inline | |
1035 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1036 | { | |
0a5a9c72 JK |
1037 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1038 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1039 | else { | |
1040 | WARN_ON_ONCE(1); | |
1041 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1042 | } | |
740d9dcd MC |
1043 | } |
1044 | ||
7a2435d8 | 1045 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1046 | { |
db49d2df JK |
1047 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1048 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1049 | dquot->dq_dqb.dqb_curinodes -= number; |
1050 | else | |
1051 | dquot->dq_dqb.dqb_curinodes = 0; | |
1052 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1053 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1054 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1055 | } | |
1056 | ||
7a2435d8 | 1057 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1058 | { |
db49d2df JK |
1059 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1060 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1061 | dquot->dq_dqb.dqb_curspace -= number; |
1062 | else | |
1063 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1064 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1065 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1066 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1067 | } | |
1068 | ||
c525460e JK |
1069 | static int warning_issued(struct dquot *dquot, const int warntype) |
1070 | { | |
1071 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1072 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1073 | ((warntype == QUOTA_NL_IHARDWARN || | |
1074 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1075 | ||
1076 | if (!flag) | |
1077 | return 0; | |
1078 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1079 | } | |
1080 | ||
8e893469 | 1081 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1082 | static int flag_print_warnings = 1; |
1083 | ||
7a2435d8 | 1084 | static int need_print_warning(struct dquot *dquot) |
1da177e4 LT |
1085 | { |
1086 | if (!flag_print_warnings) | |
1087 | return 0; | |
1088 | ||
1089 | switch (dquot->dq_type) { | |
1090 | case USRQUOTA: | |
da9592ed | 1091 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
1092 | case GRPQUOTA: |
1093 | return in_group_p(dquot->dq_id); | |
1094 | } | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1da177e4 | 1098 | /* Print warning to user which exceeded quota */ |
c525460e | 1099 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
1100 | { |
1101 | char *msg = NULL; | |
24ec839c | 1102 | struct tty_struct *tty; |
1da177e4 | 1103 | |
657d3bfa JK |
1104 | if (warntype == QUOTA_NL_IHARDBELOW || |
1105 | warntype == QUOTA_NL_ISOFTBELOW || | |
1106 | warntype == QUOTA_NL_BHARDBELOW || | |
1107 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1108 | return; |
1109 | ||
24ec839c PZ |
1110 | tty = get_current_tty(); |
1111 | if (!tty) | |
452a00d2 | 1112 | return; |
24ec839c | 1113 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1114 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1115 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1116 | else |
24ec839c PZ |
1117 | tty_write_message(tty, ": write failed, "); |
1118 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1119 | switch (warntype) { |
8e893469 | 1120 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1121 | msg = " file limit reached.\r\n"; |
1122 | break; | |
8e893469 | 1123 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1124 | msg = " file quota exceeded too long.\r\n"; |
1125 | break; | |
8e893469 | 1126 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1127 | msg = " file quota exceeded.\r\n"; |
1128 | break; | |
8e893469 | 1129 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1130 | msg = " block limit reached.\r\n"; |
1131 | break; | |
8e893469 | 1132 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1133 | msg = " block quota exceeded too long.\r\n"; |
1134 | break; | |
8e893469 | 1135 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1136 | msg = " block quota exceeded.\r\n"; |
1137 | break; | |
1138 | } | |
24ec839c | 1139 | tty_write_message(tty, msg); |
452a00d2 | 1140 | tty_kref_put(tty); |
1da177e4 | 1141 | } |
8e893469 JK |
1142 | #endif |
1143 | ||
f18df228 MC |
1144 | /* |
1145 | * Write warnings to the console and send warning messages over netlink. | |
1146 | * | |
1147 | * Note that this function can sleep. | |
1148 | */ | |
7a2435d8 | 1149 | static void flush_warnings(struct dquot *const *dquots, char *warntype) |
1da177e4 | 1150 | { |
86e931a3 | 1151 | struct dquot *dq; |
1da177e4 LT |
1152 | int i; |
1153 | ||
86e931a3 SW |
1154 | for (i = 0; i < MAXQUOTAS; i++) { |
1155 | dq = dquots[i]; | |
1156 | if (dq && warntype[i] != QUOTA_NL_NOWARN && | |
1157 | !warning_issued(dq, warntype[i])) { | |
8e893469 | 1158 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
86e931a3 | 1159 | print_warning(dq, warntype[i]); |
8e893469 | 1160 | #endif |
86e931a3 SW |
1161 | quota_send_warning(dq->dq_type, dq->dq_id, |
1162 | dq->dq_sb->s_dev, warntype[i]); | |
8e893469 | 1163 | } |
86e931a3 | 1164 | } |
1da177e4 LT |
1165 | } |
1166 | ||
7a2435d8 | 1167 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 LT |
1168 | { |
1169 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1170 | ||
1171 | return capable(CAP_SYS_RESOURCE) && | |
268157ba JK |
1172 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
1173 | !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1da177e4 LT |
1174 | } |
1175 | ||
1176 | /* needs dq_data_lock */ | |
12095460 | 1177 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1178 | { |
268157ba JK |
1179 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1180 | ||
8e893469 | 1181 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1182 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1183 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
efd8f0e6 | 1184 | return 0; |
1da177e4 LT |
1185 | |
1186 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1187 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1188 | !ignore_hardlimit(dquot)) { |
8e893469 | 1189 | *warntype = QUOTA_NL_IHARDWARN; |
efd8f0e6 | 1190 | return -EDQUOT; |
1da177e4 LT |
1191 | } |
1192 | ||
1193 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1194 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1195 | dquot->dq_dqb.dqb_itime && | |
1196 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1197 | !ignore_hardlimit(dquot)) { |
8e893469 | 1198 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
efd8f0e6 | 1199 | return -EDQUOT; |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1203 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1204 | dquot->dq_dqb.dqb_itime == 0) { |
8e893469 | 1205 | *warntype = QUOTA_NL_ISOFTWARN; |
268157ba JK |
1206 | dquot->dq_dqb.dqb_itime = get_seconds() + |
1207 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; | |
1da177e4 LT |
1208 | } |
1209 | ||
efd8f0e6 | 1210 | return 0; |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | /* needs dq_data_lock */ | |
1214 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1215 | { | |
f18df228 | 1216 | qsize_t tspace; |
268157ba | 1217 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1218 | |
8e893469 | 1219 | *warntype = QUOTA_NL_NOWARN; |
268157ba | 1220 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || |
f55abc0f | 1221 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1222 | return 0; |
1da177e4 | 1223 | |
f18df228 MC |
1224 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1225 | + space; | |
1226 | ||
1da177e4 | 1227 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1228 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1229 | !ignore_hardlimit(dquot)) { |
1230 | if (!prealloc) | |
8e893469 | 1231 | *warntype = QUOTA_NL_BHARDWARN; |
efd8f0e6 | 1232 | return -EDQUOT; |
1da177e4 LT |
1233 | } |
1234 | ||
1235 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1236 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1237 | dquot->dq_dqb.dqb_btime && |
1238 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1239 | !ignore_hardlimit(dquot)) { |
1240 | if (!prealloc) | |
8e893469 | 1241 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
efd8f0e6 | 1242 | return -EDQUOT; |
1da177e4 LT |
1243 | } |
1244 | ||
1245 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1246 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1247 | dquot->dq_dqb.dqb_btime == 0) { |
1248 | if (!prealloc) { | |
8e893469 | 1249 | *warntype = QUOTA_NL_BSOFTWARN; |
268157ba JK |
1250 | dquot->dq_dqb.dqb_btime = get_seconds() + |
1251 | sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; | |
1da177e4 LT |
1252 | } |
1253 | else | |
1254 | /* | |
1255 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1256 | * be always printed | |
1257 | */ | |
efd8f0e6 | 1258 | return -EDQUOT; |
1da177e4 LT |
1259 | } |
1260 | ||
efd8f0e6 | 1261 | return 0; |
1da177e4 LT |
1262 | } |
1263 | ||
12095460 | 1264 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1265 | { |
268157ba JK |
1266 | qsize_t newinodes; |
1267 | ||
657d3bfa | 1268 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f JK |
1269 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1270 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1271 | return QUOTA_NL_NOWARN; |
1272 | ||
268157ba JK |
1273 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1274 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1275 | return QUOTA_NL_ISOFTBELOW; |
1276 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1277 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1278 | return QUOTA_NL_IHARDBELOW; |
1279 | return QUOTA_NL_NOWARN; | |
1280 | } | |
1281 | ||
1282 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1283 | { | |
1284 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1285 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1286 | return QUOTA_NL_NOWARN; |
1287 | ||
12095460 | 1288 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1289 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1290 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1291 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1292 | return QUOTA_NL_BHARDBELOW; |
1293 | return QUOTA_NL_NOWARN; | |
1294 | } | |
0a5a9c72 | 1295 | |
1da177e4 | 1296 | /* |
871a2931 CH |
1297 | * Initialize quota pointers in inode |
1298 | * | |
1299 | * We do things in a bit complicated way but by that we avoid calling | |
1300 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1301 | * | |
1302 | * It is better to call this function outside of any transaction as it | |
1303 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1304 | */ |
871a2931 | 1305 | static void __dquot_initialize(struct inode *inode, int type) |
1da177e4 LT |
1306 | { |
1307 | unsigned int id = 0; | |
871a2931 | 1308 | int cnt; |
ad1e6e8d | 1309 | struct dquot *got[MAXQUOTAS]; |
cc33412f | 1310 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1311 | qsize_t rsv; |
1da177e4 | 1312 | |
d3be915f IM |
1313 | /* First test before acquiring mutex - solves deadlocks when we |
1314 | * re-enter the quota code and are already holding the mutex */ | |
871a2931 CH |
1315 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1316 | return; | |
cc33412f JK |
1317 | |
1318 | /* First get references to structures we might need. */ | |
1319 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
ad1e6e8d | 1320 | got[cnt] = NULL; |
cc33412f JK |
1321 | if (type != -1 && cnt != type) |
1322 | continue; | |
1323 | switch (cnt) { | |
1324 | case USRQUOTA: | |
1325 | id = inode->i_uid; | |
1326 | break; | |
1327 | case GRPQUOTA: | |
1328 | id = inode->i_gid; | |
1329 | break; | |
1330 | } | |
1331 | got[cnt] = dqget(sb, id, cnt); | |
1332 | } | |
1333 | ||
1334 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1335 | if (IS_NOQUOTA(inode)) |
1336 | goto out_err; | |
1337 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1338 | if (type != -1 && cnt != type) | |
1339 | continue; | |
cc33412f JK |
1340 | /* Avoid races with quotaoff() */ |
1341 | if (!sb_has_quota_active(sb, cnt)) | |
1342 | continue; | |
dd6f3c6d | 1343 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1344 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1345 | got[cnt] = NULL; |
0a5a9c72 JK |
1346 | /* |
1347 | * Make quota reservation system happy if someone | |
1348 | * did a write before quota was turned on | |
1349 | */ | |
1350 | rsv = inode_get_rsv_space(inode); | |
1351 | if (unlikely(rsv)) | |
1352 | dquot_resv_space(inode->i_dquot[cnt], rsv); | |
1da177e4 LT |
1353 | } |
1354 | } | |
1355 | out_err: | |
cc33412f JK |
1356 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1357 | /* Drop unused references */ | |
dc52dd3a | 1358 | dqput_all(got); |
871a2931 CH |
1359 | } |
1360 | ||
1361 | void dquot_initialize(struct inode *inode) | |
1362 | { | |
1363 | __dquot_initialize(inode, -1); | |
1da177e4 | 1364 | } |
08d0350c | 1365 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1366 | |
1367 | /* | |
1368 | * Release all quotas referenced by inode | |
1da177e4 | 1369 | */ |
9f754758 | 1370 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1371 | { |
1372 | int cnt; | |
cc33412f | 1373 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1374 | |
cc33412f | 1375 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1376 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1377 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1378 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1379 | } |
1380 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
dc52dd3a | 1381 | dqput_all(put); |
1da177e4 LT |
1382 | } |
1383 | ||
9f754758 CH |
1384 | void dquot_drop(struct inode *inode) |
1385 | { | |
1386 | int cnt; | |
1387 | ||
1388 | if (IS_NOQUOTA(inode)) | |
1389 | return; | |
1390 | ||
1391 | /* | |
1392 | * Test before calling to rule out calls from proc and such | |
1393 | * where we are not allowed to block. Note that this is | |
1394 | * actually reliable test even without the lock - the caller | |
1395 | * must assure that nobody can come after the DQUOT_DROP and | |
1396 | * add quota pointers back anyway. | |
1397 | */ | |
1398 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1399 | if (inode->i_dquot[cnt]) | |
1400 | break; | |
1401 | } | |
1402 | ||
1403 | if (cnt < MAXQUOTAS) | |
1404 | __dquot_drop(inode); | |
1405 | } | |
1406 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1407 | |
fd8fbfc1 DM |
1408 | /* |
1409 | * inode_reserved_space is managed internally by quota, and protected by | |
1410 | * i_lock similar to i_blocks+i_bytes. | |
1411 | */ | |
1412 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1413 | { | |
1414 | /* Filesystem must explicitly define it's own method in order to use | |
1415 | * quota reservation interface */ | |
1416 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1417 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1418 | } | |
1419 | ||
c469070a | 1420 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1421 | { |
1422 | spin_lock(&inode->i_lock); | |
1423 | *inode_reserved_space(inode) += number; | |
1424 | spin_unlock(&inode->i_lock); | |
1425 | } | |
c469070a | 1426 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1427 | |
c469070a | 1428 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1429 | { |
1430 | spin_lock(&inode->i_lock); | |
1431 | *inode_reserved_space(inode) -= number; | |
1432 | __inode_add_bytes(inode, number); | |
1433 | spin_unlock(&inode->i_lock); | |
1434 | } | |
c469070a | 1435 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1436 | |
c469070a | 1437 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1438 | { |
1439 | spin_lock(&inode->i_lock); | |
1440 | *inode_reserved_space(inode) -= number; | |
1441 | spin_unlock(&inode->i_lock); | |
1442 | } | |
c469070a | 1443 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1444 | |
1445 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1446 | { | |
1447 | qsize_t ret; | |
05b5d898 JK |
1448 | |
1449 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1450 | return 0; | |
fd8fbfc1 DM |
1451 | spin_lock(&inode->i_lock); |
1452 | ret = *inode_reserved_space(inode); | |
1453 | spin_unlock(&inode->i_lock); | |
1454 | return ret; | |
1455 | } | |
1456 | ||
1457 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1458 | int reserve) | |
1459 | { | |
1460 | if (reserve) | |
1461 | inode_add_rsv_space(inode, number); | |
1462 | else | |
1463 | inode_add_bytes(inode, number); | |
1464 | } | |
1465 | ||
1466 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1467 | { | |
1468 | if (reserve) | |
1469 | inode_sub_rsv_space(inode, number); | |
1470 | else | |
1471 | inode_sub_bytes(inode, number); | |
1472 | } | |
1473 | ||
1da177e4 | 1474 | /* |
5dd4056d CH |
1475 | * This functions updates i_blocks+i_bytes fields and quota information |
1476 | * (together with appropriate checks). | |
1477 | * | |
1478 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1479 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1480 | * the current transaction so that dquot write and inode write go into the | |
1481 | * same transaction. | |
1da177e4 LT |
1482 | */ |
1483 | ||
1484 | /* | |
1485 | * This operation can block, but only after everything is updated | |
1486 | */ | |
f18df228 | 1487 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
5dd4056d | 1488 | int warn, int reserve) |
1da177e4 | 1489 | { |
5dd4056d | 1490 | int cnt, ret = 0; |
1da177e4 LT |
1491 | char warntype[MAXQUOTAS]; |
1492 | ||
fd8fbfc1 DM |
1493 | /* |
1494 | * First test before acquiring mutex - solves deadlocks when we | |
1495 | * re-enter the quota code and are already holding the mutex | |
1496 | */ | |
5dd4056d | 1497 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 DM |
1498 | inode_incr_space(inode, number, reserve); |
1499 | goto out; | |
1500 | } | |
1501 | ||
1502 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1da177e4 | 1503 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1504 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1505 | |
1da177e4 LT |
1506 | spin_lock(&dq_data_lock); |
1507 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1508 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1509 | continue; |
efd8f0e6 CH |
1510 | ret = check_bdq(inode->i_dquot[cnt], number, !warn, |
1511 | warntype+cnt); | |
1512 | if (ret) { | |
fd8fbfc1 DM |
1513 | spin_unlock(&dq_data_lock); |
1514 | goto out_flush_warn; | |
f18df228 | 1515 | } |
1da177e4 LT |
1516 | } |
1517 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1518 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1519 | continue; |
f18df228 MC |
1520 | if (reserve) |
1521 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1522 | else | |
1523 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1524 | } |
fd8fbfc1 | 1525 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1526 | spin_unlock(&dq_data_lock); |
f18df228 | 1527 | |
fd8fbfc1 DM |
1528 | if (reserve) |
1529 | goto out_flush_warn; | |
dc52dd3a | 1530 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 DM |
1531 | out_flush_warn: |
1532 | flush_warnings(inode->i_dquot, warntype); | |
1da177e4 | 1533 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1534 | out: |
1535 | return ret; | |
1536 | } | |
5dd4056d | 1537 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1538 | |
1539 | /* | |
1540 | * This operation can block, but only after everything is updated | |
1541 | */ | |
63936dda | 1542 | int dquot_alloc_inode(const struct inode *inode) |
1da177e4 | 1543 | { |
efd8f0e6 | 1544 | int cnt, ret = 0; |
1da177e4 LT |
1545 | char warntype[MAXQUOTAS]; |
1546 | ||
d3be915f IM |
1547 | /* First test before acquiring mutex - solves deadlocks when we |
1548 | * re-enter the quota code and are already holding the mutex */ | |
63936dda CH |
1549 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1550 | return 0; | |
1da177e4 | 1551 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1552 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1553 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1554 | spin_lock(&dq_data_lock); |
1555 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1556 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1557 | continue; |
efd8f0e6 CH |
1558 | ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); |
1559 | if (ret) | |
1da177e4 LT |
1560 | goto warn_put_all; |
1561 | } | |
1562 | ||
1563 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1564 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1565 | continue; |
63936dda | 1566 | dquot_incr_inodes(inode->i_dquot[cnt], 1); |
1da177e4 | 1567 | } |
efd8f0e6 | 1568 | |
1da177e4 LT |
1569 | warn_put_all: |
1570 | spin_unlock(&dq_data_lock); | |
63936dda | 1571 | if (ret == 0) |
dc52dd3a | 1572 | mark_all_dquot_dirty(inode->i_dquot); |
087ee8d5 | 1573 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1574 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1575 | return ret; | |
1576 | } | |
08d0350c | 1577 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1578 | |
5dd4056d CH |
1579 | /* |
1580 | * Convert in-memory reserved quotas to real consumed quotas | |
1581 | */ | |
1582 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd MC |
1583 | { |
1584 | int cnt; | |
740d9dcd | 1585 | |
5dd4056d | 1586 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1587 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1588 | return 0; |
740d9dcd MC |
1589 | } |
1590 | ||
1591 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
740d9dcd MC |
1592 | spin_lock(&dq_data_lock); |
1593 | /* Claim reserved quotas to allocated quotas */ | |
1594 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1595 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1596 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1597 | number); | |
1598 | } | |
1599 | /* Update inode bytes */ | |
fd8fbfc1 | 1600 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1601 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1602 | mark_all_dquot_dirty(inode->i_dquot); |
740d9dcd | 1603 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
5dd4056d | 1604 | return 0; |
740d9dcd | 1605 | } |
5dd4056d | 1606 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1607 | |
1da177e4 LT |
1608 | /* |
1609 | * This operation can block, but only after everything is updated | |
1610 | */ | |
5dd4056d | 1611 | void __dquot_free_space(struct inode *inode, qsize_t number, int reserve) |
1da177e4 LT |
1612 | { |
1613 | unsigned int cnt; | |
657d3bfa | 1614 | char warntype[MAXQUOTAS]; |
1da177e4 | 1615 | |
d3be915f IM |
1616 | /* First test before acquiring mutex - solves deadlocks when we |
1617 | * re-enter the quota code and are already holding the mutex */ | |
5dd4056d | 1618 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { |
fd8fbfc1 | 1619 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1620 | return; |
1da177e4 | 1621 | } |
657d3bfa | 1622 | |
1da177e4 | 1623 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1624 | spin_lock(&dq_data_lock); |
1625 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1626 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1627 | continue; |
657d3bfa | 1628 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
fd8fbfc1 DM |
1629 | if (reserve) |
1630 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1631 | else | |
1632 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1633 | } |
fd8fbfc1 | 1634 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1635 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1636 | |
1637 | if (reserve) | |
1638 | goto out_unlock; | |
dc52dd3a | 1639 | mark_all_dquot_dirty(inode->i_dquot); |
fd8fbfc1 | 1640 | out_unlock: |
657d3bfa | 1641 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1642 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
fd8fbfc1 | 1643 | } |
5dd4056d | 1644 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1645 | |
1da177e4 LT |
1646 | /* |
1647 | * This operation can block, but only after everything is updated | |
1648 | */ | |
63936dda | 1649 | void dquot_free_inode(const struct inode *inode) |
1da177e4 LT |
1650 | { |
1651 | unsigned int cnt; | |
657d3bfa | 1652 | char warntype[MAXQUOTAS]; |
1da177e4 | 1653 | |
d3be915f IM |
1654 | /* First test before acquiring mutex - solves deadlocks when we |
1655 | * re-enter the quota code and are already holding the mutex */ | |
63936dda CH |
1656 | if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) |
1657 | return; | |
657d3bfa | 1658 | |
1da177e4 | 1659 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 LT |
1660 | spin_lock(&dq_data_lock); |
1661 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1662 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1663 | continue; |
63936dda CH |
1664 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); |
1665 | dquot_decr_inodes(inode->i_dquot[cnt], 1); | |
1da177e4 LT |
1666 | } |
1667 | spin_unlock(&dq_data_lock); | |
dc52dd3a | 1668 | mark_all_dquot_dirty(inode->i_dquot); |
657d3bfa | 1669 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 | 1670 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1671 | } |
08d0350c | 1672 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1673 | |
1674 | /* | |
1675 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1676 | * | |
1677 | * This operation can block, but only after everything is updated | |
1678 | * A transaction must be started when entering this function. | |
1679 | */ | |
b43fa828 | 1680 | static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask) |
1da177e4 | 1681 | { |
740d9dcd MC |
1682 | qsize_t space, cur_space; |
1683 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1684 | struct dquot *transfer_from[MAXQUOTAS]; |
1685 | struct dquot *transfer_to[MAXQUOTAS]; | |
efd8f0e6 | 1686 | int cnt, ret = 0; |
657d3bfa JK |
1687 | char warntype_to[MAXQUOTAS]; |
1688 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1689 | |
d3be915f IM |
1690 | /* First test before acquiring mutex - solves deadlocks when we |
1691 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 | 1692 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1693 | return 0; |
cc33412f | 1694 | /* Initialize the arrays */ |
1da177e4 | 1695 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
dd6f3c6d JK |
1696 | transfer_from[cnt] = NULL; |
1697 | transfer_to[cnt] = NULL; | |
657d3bfa | 1698 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1699 | } |
8ddd69d6 DM |
1700 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1701 | if (mask & (1 << cnt)) | |
1702 | transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt); | |
1703 | } | |
cc33412f | 1704 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
cc33412f JK |
1705 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
1706 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1707 | goto put_all; | |
1708 | } | |
1da177e4 | 1709 | spin_lock(&dq_data_lock); |
740d9dcd | 1710 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1711 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1712 | space = cur_space + rsv_space; |
1da177e4 LT |
1713 | /* Build the transfer_from list and check the limits */ |
1714 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1715 | if (!transfer_to[cnt]) |
1da177e4 LT |
1716 | continue; |
1717 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
efd8f0e6 CH |
1718 | ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); |
1719 | if (ret) | |
1720 | goto over_quota; | |
1721 | ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); | |
1722 | if (ret) | |
cc33412f | 1723 | goto over_quota; |
1da177e4 LT |
1724 | } |
1725 | ||
1726 | /* | |
1727 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1728 | */ | |
1729 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1730 | /* | |
1731 | * Skip changes for same uid or gid or for turned off quota-type. | |
1732 | */ | |
dd6f3c6d | 1733 | if (!transfer_to[cnt]) |
1da177e4 LT |
1734 | continue; |
1735 | ||
1736 | /* Due to IO error we might not have transfer_from[] structure */ | |
1737 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1738 | warntype_from_inodes[cnt] = |
1739 | info_idq_free(transfer_from[cnt], 1); | |
1740 | warntype_from_space[cnt] = | |
1741 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1742 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1743 | dquot_decr_space(transfer_from[cnt], cur_space); |
1744 | dquot_free_reserved_space(transfer_from[cnt], | |
1745 | rsv_space); | |
1da177e4 LT |
1746 | } |
1747 | ||
1748 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1749 | dquot_incr_space(transfer_to[cnt], cur_space); |
1750 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1751 | |
1752 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1753 | } | |
1da177e4 | 1754 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1755 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1756 | ||
dc52dd3a DM |
1757 | mark_all_dquot_dirty(transfer_from); |
1758 | mark_all_dquot_dirty(transfer_to); | |
1759 | /* The reference we got is transferred to the inode */ | |
1760 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1761 | transfer_to[cnt] = NULL; | |
cc33412f | 1762 | warn_put_all: |
657d3bfa JK |
1763 | flush_warnings(transfer_to, warntype_to); |
1764 | flush_warnings(transfer_from, warntype_from_inodes); | |
1765 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1766 | put_all: |
dc52dd3a DM |
1767 | dqput_all(transfer_from); |
1768 | dqput_all(transfer_to); | |
1da177e4 | 1769 | return ret; |
cc33412f JK |
1770 | over_quota: |
1771 | spin_unlock(&dq_data_lock); | |
1772 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1773 | /* Clear dquot pointers we don't want to dqput() */ | |
1774 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1775 | transfer_from[cnt] = NULL; |
cc33412f | 1776 | goto warn_put_all; |
1da177e4 LT |
1777 | } |
1778 | ||
8ddd69d6 DM |
1779 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1780 | * Called from FSXXX_setattr() | |
1781 | */ | |
b43fa828 | 1782 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1783 | { |
8ddd69d6 DM |
1784 | qid_t chid[MAXQUOTAS]; |
1785 | unsigned long mask = 0; | |
1786 | ||
1787 | if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) { | |
1788 | mask |= 1 << USRQUOTA; | |
1789 | chid[USRQUOTA] = iattr->ia_uid; | |
1790 | } | |
1791 | if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) { | |
1792 | mask |= 1 << GRPQUOTA; | |
1793 | chid[GRPQUOTA] = iattr->ia_gid; | |
1794 | } | |
f55abc0f | 1795 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
871a2931 | 1796 | dquot_initialize(inode); |
efd8f0e6 | 1797 | return __dquot_transfer(inode, chid, mask); |
b85f4b87 JK |
1798 | } |
1799 | return 0; | |
1800 | } | |
b43fa828 | 1801 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 1802 | |
1da177e4 LT |
1803 | /* |
1804 | * Write info of quota file to disk | |
1805 | */ | |
1806 | int dquot_commit_info(struct super_block *sb, int type) | |
1807 | { | |
1808 | int ret; | |
1809 | struct quota_info *dqopt = sb_dqopt(sb); | |
1810 | ||
d3be915f | 1811 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1812 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1813 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1814 | return ret; |
1815 | } | |
08d0350c | 1816 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1817 | |
1818 | /* | |
1819 | * Definitions of diskquota operations. | |
1820 | */ | |
61e225dc | 1821 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1822 | .write_dquot = dquot_commit, |
1823 | .acquire_dquot = dquot_acquire, | |
1824 | .release_dquot = dquot_release, | |
1825 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1826 | .write_info = dquot_commit_info, |
1827 | .alloc_dquot = dquot_alloc, | |
1828 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1829 | }; |
1830 | ||
907f4554 CH |
1831 | /* |
1832 | * Generic helper for ->open on filesystems supporting disk quotas. | |
1833 | */ | |
1834 | int dquot_file_open(struct inode *inode, struct file *file) | |
1835 | { | |
1836 | int error; | |
1837 | ||
1838 | error = generic_file_open(inode, file); | |
1839 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 1840 | dquot_initialize(inode); |
907f4554 CH |
1841 | return error; |
1842 | } | |
1843 | EXPORT_SYMBOL(dquot_file_open); | |
1844 | ||
1da177e4 LT |
1845 | /* |
1846 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1847 | */ | |
f55abc0f | 1848 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1849 | { |
0ff5af83 | 1850 | int cnt, ret = 0; |
1da177e4 LT |
1851 | struct quota_info *dqopt = sb_dqopt(sb); |
1852 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1853 | |
f55abc0f JK |
1854 | /* Cannot turn off usage accounting without turning off limits, or |
1855 | * suspend quotas and simultaneously turn quotas off. */ | |
1856 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1857 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1858 | DQUOT_USAGE_ENABLED))) | |
1859 | return -EINVAL; | |
1860 | ||
1da177e4 | 1861 | /* We need to serialize quota_off() for device */ |
d3be915f | 1862 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1863 | |
1864 | /* | |
1865 | * Skip everything if there's nothing to do. We have to do this because | |
1866 | * sometimes we are called when fill_super() failed and calling | |
1867 | * sync_fs() in such cases does no good. | |
1868 | */ | |
f55abc0f | 1869 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1870 | mutex_unlock(&dqopt->dqonoff_mutex); |
1871 | return 0; | |
1872 | } | |
1da177e4 LT |
1873 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1874 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1875 | if (type != -1 && cnt != type) |
1876 | continue; | |
f55abc0f | 1877 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1878 | continue; |
f55abc0f JK |
1879 | |
1880 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1881 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1882 | dqopt->flags |= |
1883 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1884 | spin_unlock(&dq_state_lock); |
f55abc0f | 1885 | } else { |
cc33412f | 1886 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1887 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1888 | /* Turning off suspended quotas? */ | |
1889 | if (!sb_has_quota_loaded(sb, cnt) && | |
1890 | sb_has_quota_suspended(sb, cnt)) { | |
1891 | dqopt->flags &= ~dquot_state_flag( | |
1892 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1893 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1894 | iput(dqopt->files[cnt]); |
1895 | dqopt->files[cnt] = NULL; | |
1896 | continue; | |
1897 | } | |
cc33412f | 1898 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1899 | } |
f55abc0f JK |
1900 | |
1901 | /* We still have to keep quota loaded? */ | |
1902 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1903 | continue; |
1da177e4 LT |
1904 | |
1905 | /* Note: these are blocking operations */ | |
1906 | drop_dquot_ref(sb, cnt); | |
1907 | invalidate_dquots(sb, cnt); | |
1908 | /* | |
268157ba JK |
1909 | * Now all dquots should be invalidated, all writes done so we |
1910 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
1911 | */ |
1912 | if (info_dirty(&dqopt->info[cnt])) | |
1913 | sb->dq_op->write_info(sb, cnt); | |
1914 | if (dqopt->ops[cnt]->free_file_info) | |
1915 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1916 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1917 | ||
1918 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1919 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1920 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1921 | dqopt->info[cnt].dqi_flags = 0; |
1922 | dqopt->info[cnt].dqi_igrace = 0; | |
1923 | dqopt->info[cnt].dqi_bgrace = 0; | |
1924 | dqopt->ops[cnt] = NULL; | |
1925 | } | |
d3be915f | 1926 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1927 | |
1928 | /* Skip syncing and setting flags if quota files are hidden */ | |
1929 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1930 | goto put_inodes; | |
1931 | ||
1da177e4 | 1932 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1933 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1934 | if (sb->s_op->sync_fs) |
1935 | sb->s_op->sync_fs(sb, 1); | |
1936 | sync_blockdev(sb->s_bdev); | |
1937 | /* Now the quota files are just ordinary files and we can set the | |
1938 | * inode flags back. Moreover we discard the pagecache so that | |
1939 | * userspace sees the writes we did bypassing the pagecache. We | |
1940 | * must also discard the blockdev buffers so that we see the | |
1941 | * changes done by userspace on the next quotaon() */ | |
1942 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1943 | if (toputinode[cnt]) { | |
d3be915f | 1944 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1945 | /* If quota was reenabled in the meantime, we have |
1946 | * nothing to do */ | |
f55abc0f | 1947 | if (!sb_has_quota_loaded(sb, cnt)) { |
268157ba JK |
1948 | mutex_lock_nested(&toputinode[cnt]->i_mutex, |
1949 | I_MUTEX_QUOTA); | |
1da177e4 LT |
1950 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1951 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
1952 | truncate_inode_pages(&toputinode[cnt]->i_data, |
1953 | 0); | |
1b1dcc1b | 1954 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1955 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1956 | } |
d3be915f | 1957 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1958 | } |
1959 | if (sb->s_bdev) | |
1960 | invalidate_bdev(sb->s_bdev); | |
1961 | put_inodes: | |
1962 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1963 | if (toputinode[cnt]) { | |
0ff5af83 | 1964 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1965 | * can reenable quota on the subsequent remount RW. We |
1966 | * have to check 'flags' variable and not use sb_has_ | |
1967 | * function because another quotaon / quotaoff could | |
1968 | * change global state before we got here. We refuse | |
1969 | * to suspend quotas when there is pending delete on | |
1970 | * the quota file... */ | |
1971 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1972 | iput(toputinode[cnt]); |
1973 | else if (!toputinode[cnt]->i_nlink) | |
1974 | ret = -EBUSY; | |
1da177e4 | 1975 | } |
0ff5af83 | 1976 | return ret; |
1da177e4 | 1977 | } |
08d0350c | 1978 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 1979 | |
f55abc0f JK |
1980 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1981 | { | |
1982 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1983 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1984 | } | |
08d0350c | 1985 | EXPORT_SYMBOL(vfs_quota_off); |
1da177e4 LT |
1986 | /* |
1987 | * Turn quotas on on a device | |
1988 | */ | |
1989 | ||
f55abc0f JK |
1990 | /* |
1991 | * Helper function to turn quotas on when we already have the inode of | |
1992 | * quota file and no quota information is loaded. | |
1993 | */ | |
1994 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1995 | unsigned int flags) | |
1da177e4 LT |
1996 | { |
1997 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1998 | struct super_block *sb = inode->i_sb; | |
1999 | struct quota_info *dqopt = sb_dqopt(sb); | |
2000 | int error; | |
2001 | int oldflags = -1; | |
2002 | ||
2003 | if (!fmt) | |
2004 | return -ESRCH; | |
2005 | if (!S_ISREG(inode->i_mode)) { | |
2006 | error = -EACCES; | |
2007 | goto out_fmt; | |
2008 | } | |
2009 | if (IS_RDONLY(inode)) { | |
2010 | error = -EROFS; | |
2011 | goto out_fmt; | |
2012 | } | |
2013 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
2014 | error = -EINVAL; | |
2015 | goto out_fmt; | |
2016 | } | |
f55abc0f JK |
2017 | /* Usage always has to be set... */ |
2018 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2019 | error = -EINVAL; | |
2020 | goto out_fmt; | |
2021 | } | |
1da177e4 | 2022 | |
ca785ec6 | 2023 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2024 | /* As we bypass the pagecache we must now flush all the |
2025 | * dirty data and invalidate caches so that kernel sees | |
2026 | * changes from userspace. It is not enough to just flush | |
2027 | * the quota file since if blocksize < pagesize, invalidation | |
2028 | * of the cache could fail because of other unrelated dirty | |
2029 | * data */ | |
2030 | sync_filesystem(sb); | |
ca785ec6 JK |
2031 | invalidate_bdev(sb->s_bdev); |
2032 | } | |
d3be915f | 2033 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2034 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2035 | error = -EBUSY; |
2036 | goto out_lock; | |
2037 | } | |
ca785ec6 JK |
2038 | |
2039 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2040 | /* We don't want quota and atime on quota files (deadlocks | |
2041 | * possible) Also nobody should write to the file - we use | |
2042 | * special IO operations which ignore the immutable bit. */ | |
dee86565 | 2043 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
268157ba JK |
2044 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2045 | S_NOQUOTA); | |
ca785ec6 | 2046 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2047 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
2048 | /* |
2049 | * When S_NOQUOTA is set, remove dquot references as no more | |
2050 | * references can be added | |
2051 | */ | |
9f754758 | 2052 | __dquot_drop(inode); |
ca785ec6 | 2053 | } |
1da177e4 LT |
2054 | |
2055 | error = -EIO; | |
2056 | dqopt->files[type] = igrab(inode); | |
2057 | if (!dqopt->files[type]) | |
2058 | goto out_lock; | |
2059 | error = -EINVAL; | |
2060 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2061 | goto out_file_init; | |
2062 | ||
2063 | dqopt->ops[type] = fmt->qf_ops; | |
2064 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2065 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2066 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2067 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2068 | error = dqopt->ops[type]->read_file_info(sb, type); |
2069 | if (error < 0) { | |
d3be915f | 2070 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2071 | goto out_file_init; |
2072 | } | |
d3be915f | 2073 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2074 | spin_lock(&dq_state_lock); |
f55abc0f | 2075 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2076 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2077 | |
2078 | add_dquot_ref(sb, type); | |
d3be915f | 2079 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2080 | |
2081 | return 0; | |
2082 | ||
2083 | out_file_init: | |
2084 | dqopt->files[type] = NULL; | |
2085 | iput(inode); | |
2086 | out_lock: | |
1da177e4 | 2087 | if (oldflags != -1) { |
dee86565 | 2088 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2089 | /* Set the flags back (in the case of accidental quotaon() |
2090 | * on a wrong file we don't want to mess up the flags) */ | |
2091 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2092 | inode->i_flags |= oldflags; | |
dee86565 | 2093 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2094 | } |
d01730d7 | 2095 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2096 | out_fmt: |
2097 | put_quota_format(fmt); | |
2098 | ||
2099 | return error; | |
2100 | } | |
2101 | ||
0ff5af83 JK |
2102 | /* Reenable quotas on remount RW */ |
2103 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2104 | { | |
2105 | struct quota_info *dqopt = sb_dqopt(sb); | |
2106 | struct inode *inode; | |
2107 | int ret; | |
f55abc0f | 2108 | unsigned int flags; |
0ff5af83 JK |
2109 | |
2110 | mutex_lock(&dqopt->dqonoff_mutex); | |
2111 | if (!sb_has_quota_suspended(sb, type)) { | |
2112 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2113 | return 0; | |
2114 | } | |
0ff5af83 JK |
2115 | inode = dqopt->files[type]; |
2116 | dqopt->files[type] = NULL; | |
cc33412f | 2117 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2118 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2119 | DQUOT_LIMITS_ENABLED, type); | |
2120 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2121 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2122 | mutex_unlock(&dqopt->dqonoff_mutex); |
2123 | ||
f55abc0f JK |
2124 | flags = dquot_generic_flag(flags, type); |
2125 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2126 | flags); | |
0ff5af83 JK |
2127 | iput(inode); |
2128 | ||
2129 | return ret; | |
2130 | } | |
2131 | ||
77e69dac AV |
2132 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2133 | struct path *path) | |
2134 | { | |
2135 | int error = security_quota_on(path->dentry); | |
2136 | if (error) | |
2137 | return error; | |
2138 | /* Quota file not on the same filesystem? */ | |
2139 | if (path->mnt->mnt_sb != sb) | |
2140 | error = -EXDEV; | |
2141 | else | |
f55abc0f JK |
2142 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2143 | format_id, DQUOT_USAGE_ENABLED | | |
2144 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2145 | return error; |
2146 | } | |
08d0350c | 2147 | EXPORT_SYMBOL(vfs_quota_on_path); |
77e69dac | 2148 | |
8264613d | 2149 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2150 | int remount) |
1da177e4 | 2151 | { |
8264613d | 2152 | struct path path; |
1da177e4 LT |
2153 | int error; |
2154 | ||
0ff5af83 JK |
2155 | if (remount) |
2156 | return vfs_quota_on_remount(sb, type); | |
2157 | ||
8264613d | 2158 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2159 | if (!error) { |
8264613d AV |
2160 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2161 | path_put(&path); | |
77e69dac | 2162 | } |
1da177e4 LT |
2163 | return error; |
2164 | } | |
08d0350c | 2165 | EXPORT_SYMBOL(vfs_quota_on); |
1da177e4 | 2166 | |
f55abc0f JK |
2167 | /* |
2168 | * More powerful function for turning on quotas allowing setting | |
2169 | * of individual quota flags | |
2170 | */ | |
2171 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2172 | unsigned int flags) | |
2173 | { | |
2174 | int ret = 0; | |
2175 | struct super_block *sb = inode->i_sb; | |
2176 | struct quota_info *dqopt = sb_dqopt(sb); | |
2177 | ||
2178 | /* Just unsuspend quotas? */ | |
2179 | if (flags & DQUOT_SUSPENDED) | |
2180 | return vfs_quota_on_remount(sb, type); | |
2181 | if (!flags) | |
2182 | return 0; | |
2183 | /* Just updating flags needed? */ | |
2184 | if (sb_has_quota_loaded(sb, type)) { | |
2185 | mutex_lock(&dqopt->dqonoff_mutex); | |
2186 | /* Now do a reliable test... */ | |
2187 | if (!sb_has_quota_loaded(sb, type)) { | |
2188 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2189 | goto load_quota; | |
2190 | } | |
2191 | if (flags & DQUOT_USAGE_ENABLED && | |
2192 | sb_has_quota_usage_enabled(sb, type)) { | |
2193 | ret = -EBUSY; | |
2194 | goto out_lock; | |
2195 | } | |
2196 | if (flags & DQUOT_LIMITS_ENABLED && | |
2197 | sb_has_quota_limits_enabled(sb, type)) { | |
2198 | ret = -EBUSY; | |
2199 | goto out_lock; | |
2200 | } | |
cc33412f | 2201 | spin_lock(&dq_state_lock); |
f55abc0f | 2202 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2203 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2204 | out_lock: |
2205 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2206 | return ret; | |
2207 | } | |
2208 | ||
2209 | load_quota: | |
2210 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2211 | } | |
08d0350c | 2212 | EXPORT_SYMBOL(vfs_quota_enable); |
f55abc0f | 2213 | |
1da177e4 LT |
2214 | /* |
2215 | * This function is used when filesystem needs to initialize quotas | |
2216 | * during mount time. | |
2217 | */ | |
84de856e CH |
2218 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2219 | int format_id, int type) | |
1da177e4 | 2220 | { |
84de856e | 2221 | struct dentry *dentry; |
1da177e4 LT |
2222 | int error; |
2223 | ||
c56818d7 | 2224 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2225 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2226 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2227 | if (IS_ERR(dentry)) |
2228 | return PTR_ERR(dentry); | |
2229 | ||
154f484b JK |
2230 | if (!dentry->d_inode) { |
2231 | error = -ENOENT; | |
2232 | goto out; | |
2233 | } | |
2234 | ||
1da177e4 | 2235 | error = security_quota_on(dentry); |
84de856e | 2236 | if (!error) |
f55abc0f JK |
2237 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2238 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2239 | |
154f484b | 2240 | out: |
84de856e CH |
2241 | dput(dentry); |
2242 | return error; | |
1da177e4 | 2243 | } |
08d0350c | 2244 | EXPORT_SYMBOL(vfs_quota_on_mount); |
1da177e4 | 2245 | |
b85f4b87 JK |
2246 | /* Wrapper to turn on quotas when remounting rw */ |
2247 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2248 | { | |
2249 | int cnt; | |
2250 | int ret = 0, err; | |
2251 | ||
2252 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2253 | return -ENOSYS; | |
2254 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2255 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2256 | if (err < 0 && !ret) | |
2257 | ret = err; | |
2258 | } | |
2259 | return ret; | |
2260 | } | |
08d0350c | 2261 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |
b85f4b87 | 2262 | |
12095460 JK |
2263 | static inline qsize_t qbtos(qsize_t blocks) |
2264 | { | |
2265 | return blocks << QIF_DQBLKSIZE_BITS; | |
2266 | } | |
2267 | ||
2268 | static inline qsize_t stoqb(qsize_t space) | |
2269 | { | |
2270 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2271 | } | |
2272 | ||
1da177e4 LT |
2273 | /* Generic routine for getting common part of quota structure */ |
2274 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2275 | { | |
2276 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2277 | ||
2278 | spin_lock(&dq_data_lock); | |
12095460 JK |
2279 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2280 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
f18df228 | 2281 | di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; |
1da177e4 LT |
2282 | di->dqb_ihardlimit = dm->dqb_ihardlimit; |
2283 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2284 | di->dqb_curinodes = dm->dqb_curinodes; | |
2285 | di->dqb_btime = dm->dqb_btime; | |
2286 | di->dqb_itime = dm->dqb_itime; | |
2287 | di->dqb_valid = QIF_ALL; | |
2288 | spin_unlock(&dq_data_lock); | |
2289 | } | |
2290 | ||
268157ba JK |
2291 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, |
2292 | struct if_dqblk *di) | |
1da177e4 LT |
2293 | { |
2294 | struct dquot *dquot; | |
2295 | ||
cc33412f | 2296 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2297 | if (!dquot) |
1da177e4 | 2298 | return -ESRCH; |
1da177e4 LT |
2299 | do_get_dqblk(dquot, di); |
2300 | dqput(dquot); | |
cc33412f | 2301 | |
1da177e4 LT |
2302 | return 0; |
2303 | } | |
08d0350c | 2304 | EXPORT_SYMBOL(vfs_get_dqblk); |
1da177e4 LT |
2305 | |
2306 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2307 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2308 | { |
2309 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2310 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2311 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2312 | ||
2313 | if ((di->dqb_valid & QIF_BLIMITS && | |
2314 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2315 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2316 | (di->dqb_valid & QIF_ILIMITS && | |
2317 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2318 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2319 | return -ERANGE; | |
1da177e4 LT |
2320 | |
2321 | spin_lock(&dq_data_lock); | |
2322 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2323 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2324 | check_blim = 1; |
4d59bce4 | 2325 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2326 | } |
2327 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2328 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2329 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2330 | check_blim = 1; |
4d59bce4 | 2331 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2332 | } |
2333 | if (di->dqb_valid & QIF_INODES) { | |
2334 | dm->dqb_curinodes = di->dqb_curinodes; | |
2335 | check_ilim = 1; | |
4d59bce4 | 2336 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2337 | } |
2338 | if (di->dqb_valid & QIF_ILIMITS) { | |
2339 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2340 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2341 | check_ilim = 1; | |
4d59bce4 | 2342 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2343 | } |
4d59bce4 | 2344 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2345 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2346 | check_blim = 1; |
4d59bce4 JK |
2347 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2348 | } | |
2349 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2350 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2351 | check_ilim = 1; |
4d59bce4 JK |
2352 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2353 | } | |
1da177e4 LT |
2354 | |
2355 | if (check_blim) { | |
268157ba JK |
2356 | if (!dm->dqb_bsoftlimit || |
2357 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2358 | dm->dqb_btime = 0; |
2359 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
268157ba JK |
2360 | } else if (!(di->dqb_valid & QIF_BTIME)) |
2361 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2362 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2363 | } |
2364 | if (check_ilim) { | |
268157ba JK |
2365 | if (!dm->dqb_isoftlimit || |
2366 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2367 | dm->dqb_itime = 0; |
2368 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
268157ba JK |
2369 | } else if (!(di->dqb_valid & QIF_ITIME)) |
2370 | /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2371 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2372 | } |
268157ba JK |
2373 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2374 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2375 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2376 | else | |
2377 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2378 | spin_unlock(&dq_data_lock); | |
2379 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2380 | |
2381 | return 0; | |
1da177e4 LT |
2382 | } |
2383 | ||
268157ba JK |
2384 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, |
2385 | struct if_dqblk *di) | |
1da177e4 LT |
2386 | { |
2387 | struct dquot *dquot; | |
338bf9af | 2388 | int rc; |
1da177e4 | 2389 | |
f55abc0f JK |
2390 | dquot = dqget(sb, id, type); |
2391 | if (!dquot) { | |
2392 | rc = -ESRCH; | |
2393 | goto out; | |
1da177e4 | 2394 | } |
338bf9af | 2395 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2396 | dqput(dquot); |
f55abc0f | 2397 | out: |
338bf9af | 2398 | return rc; |
1da177e4 | 2399 | } |
08d0350c | 2400 | EXPORT_SYMBOL(vfs_set_dqblk); |
1da177e4 LT |
2401 | |
2402 | /* Generic routine for getting common part of quota file information */ | |
2403 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2404 | { | |
2405 | struct mem_dqinfo *mi; | |
2406 | ||
d3be915f | 2407 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2408 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2409 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2410 | return -ESRCH; |
2411 | } | |
2412 | mi = sb_dqopt(sb)->info + type; | |
2413 | spin_lock(&dq_data_lock); | |
2414 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2415 | ii->dqi_igrace = mi->dqi_igrace; | |
2416 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2417 | ii->dqi_valid = IIF_ALL; | |
2418 | spin_unlock(&dq_data_lock); | |
d3be915f | 2419 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2420 | return 0; |
2421 | } | |
08d0350c | 2422 | EXPORT_SYMBOL(vfs_get_dqinfo); |
1da177e4 LT |
2423 | |
2424 | /* Generic routine for setting common part of quota file information */ | |
2425 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2426 | { | |
2427 | struct mem_dqinfo *mi; | |
f55abc0f | 2428 | int err = 0; |
1da177e4 | 2429 | |
d3be915f | 2430 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2431 | if (!sb_has_quota_active(sb, type)) { |
2432 | err = -ESRCH; | |
2433 | goto out; | |
1da177e4 LT |
2434 | } |
2435 | mi = sb_dqopt(sb)->info + type; | |
2436 | spin_lock(&dq_data_lock); | |
2437 | if (ii->dqi_valid & IIF_BGRACE) | |
2438 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2439 | if (ii->dqi_valid & IIF_IGRACE) | |
2440 | mi->dqi_igrace = ii->dqi_igrace; | |
2441 | if (ii->dqi_valid & IIF_FLAGS) | |
268157ba JK |
2442 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | |
2443 | (ii->dqi_flags & DQF_MASK); | |
1da177e4 LT |
2444 | spin_unlock(&dq_data_lock); |
2445 | mark_info_dirty(sb, type); | |
2446 | /* Force write to disk */ | |
2447 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2448 | out: |
d3be915f | 2449 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2450 | return err; |
1da177e4 | 2451 | } |
08d0350c | 2452 | EXPORT_SYMBOL(vfs_set_dqinfo); |
1da177e4 | 2453 | |
0d54b217 | 2454 | const struct quotactl_ops vfs_quotactl_ops = { |
1da177e4 LT |
2455 | .quota_on = vfs_quota_on, |
2456 | .quota_off = vfs_quota_off, | |
2457 | .quota_sync = vfs_quota_sync, | |
2458 | .get_info = vfs_get_dqinfo, | |
2459 | .set_info = vfs_set_dqinfo, | |
2460 | .get_dqblk = vfs_get_dqblk, | |
2461 | .set_dqblk = vfs_set_dqblk | |
2462 | }; | |
2463 | ||
2464 | static ctl_table fs_dqstats_table[] = { | |
2465 | { | |
1da177e4 LT |
2466 | .procname = "lookups", |
2467 | .data = &dqstats.lookups, | |
2468 | .maxlen = sizeof(int), | |
2469 | .mode = 0444, | |
6d456111 | 2470 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2471 | }, |
2472 | { | |
1da177e4 LT |
2473 | .procname = "drops", |
2474 | .data = &dqstats.drops, | |
2475 | .maxlen = sizeof(int), | |
2476 | .mode = 0444, | |
6d456111 | 2477 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2478 | }, |
2479 | { | |
1da177e4 LT |
2480 | .procname = "reads", |
2481 | .data = &dqstats.reads, | |
2482 | .maxlen = sizeof(int), | |
2483 | .mode = 0444, | |
6d456111 | 2484 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2485 | }, |
2486 | { | |
1da177e4 LT |
2487 | .procname = "writes", |
2488 | .data = &dqstats.writes, | |
2489 | .maxlen = sizeof(int), | |
2490 | .mode = 0444, | |
6d456111 | 2491 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2492 | }, |
2493 | { | |
1da177e4 LT |
2494 | .procname = "cache_hits", |
2495 | .data = &dqstats.cache_hits, | |
2496 | .maxlen = sizeof(int), | |
2497 | .mode = 0444, | |
6d456111 | 2498 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2499 | }, |
2500 | { | |
1da177e4 LT |
2501 | .procname = "allocated_dquots", |
2502 | .data = &dqstats.allocated_dquots, | |
2503 | .maxlen = sizeof(int), | |
2504 | .mode = 0444, | |
6d456111 | 2505 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2506 | }, |
2507 | { | |
1da177e4 LT |
2508 | .procname = "free_dquots", |
2509 | .data = &dqstats.free_dquots, | |
2510 | .maxlen = sizeof(int), | |
2511 | .mode = 0444, | |
6d456111 | 2512 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2513 | }, |
2514 | { | |
1da177e4 LT |
2515 | .procname = "syncs", |
2516 | .data = &dqstats.syncs, | |
2517 | .maxlen = sizeof(int), | |
2518 | .mode = 0444, | |
6d456111 | 2519 | .proc_handler = proc_dointvec, |
1da177e4 | 2520 | }, |
8e893469 | 2521 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2522 | { |
1da177e4 LT |
2523 | .procname = "warnings", |
2524 | .data = &flag_print_warnings, | |
2525 | .maxlen = sizeof(int), | |
2526 | .mode = 0644, | |
6d456111 | 2527 | .proc_handler = proc_dointvec, |
1da177e4 | 2528 | }, |
8e893469 | 2529 | #endif |
ab09203e | 2530 | { }, |
1da177e4 LT |
2531 | }; |
2532 | ||
2533 | static ctl_table fs_table[] = { | |
2534 | { | |
1da177e4 LT |
2535 | .procname = "quota", |
2536 | .mode = 0555, | |
2537 | .child = fs_dqstats_table, | |
2538 | }, | |
ab09203e | 2539 | { }, |
1da177e4 LT |
2540 | }; |
2541 | ||
2542 | static ctl_table sys_table[] = { | |
2543 | { | |
1da177e4 LT |
2544 | .procname = "fs", |
2545 | .mode = 0555, | |
2546 | .child = fs_table, | |
2547 | }, | |
ab09203e | 2548 | { }, |
1da177e4 LT |
2549 | }; |
2550 | ||
2551 | static int __init dquot_init(void) | |
2552 | { | |
2553 | int i; | |
2554 | unsigned long nr_hash, order; | |
2555 | ||
2556 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2557 | ||
0b4d4147 | 2558 | register_sysctl_table(sys_table); |
1da177e4 | 2559 | |
20c2df83 | 2560 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2561 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2562 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2563 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2564 | NULL); |
1da177e4 LT |
2565 | |
2566 | order = 0; | |
2567 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2568 | if (!dquot_hash) | |
2569 | panic("Cannot create dquot hash table"); | |
2570 | ||
2571 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2572 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2573 | dq_hash_bits = 0; | |
2574 | do { | |
2575 | dq_hash_bits++; | |
2576 | } while (nr_hash >> dq_hash_bits); | |
2577 | dq_hash_bits--; | |
2578 | ||
2579 | nr_hash = 1UL << dq_hash_bits; | |
2580 | dq_hash_mask = nr_hash - 1; | |
2581 | for (i = 0; i < nr_hash; i++) | |
2582 | INIT_HLIST_HEAD(dquot_hash + i); | |
2583 | ||
2584 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2585 | nr_hash, order, (PAGE_SIZE << order)); | |
2586 | ||
8e1f936b | 2587 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2588 | |
2589 | return 0; | |
2590 | } | |
2591 | module_init(dquot_init); |