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