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.. */ |
8e893469 JK |
80 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
81 | #include <net/netlink.h> | |
82 | #include <net/genetlink.h> | |
83 | #endif | |
1da177e4 LT |
84 | |
85 | #include <asm/uaccess.h> | |
86 | ||
87 | #define __DQUOT_PARANOIA | |
88 | ||
89 | /* | |
cc33412f JK |
90 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
91 | * and quota formats, dqstats structure containing statistics about the lists | |
92 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and | |
93 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 94 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
95 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
96 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
97 | * about latest values take it as well. | |
1da177e4 | 98 | * |
cc33412f JK |
99 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
100 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
101 | * |
102 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
103 | * the life of the dquot structure and so needn't to be protected by a lock | |
104 | * | |
105 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
106 | * operation is just reading pointers from inode (or not using them at all) the | |
107 | * read lock is enough. If pointers are altered function must hold write lock | |
108 | * (these locking rules also apply for S_NOQUOTA flag in the inode - note that | |
cc33412f | 109 | * for altering the flag i_mutex is also needed). |
1da177e4 | 110 | * |
d3be915f | 111 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
112 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
113 | * Currently dquot is locked only when it is being read to memory (or space for | |
114 | * it is being allocated) on the first dqget() and when it is being released on | |
115 | * the last dqput(). The allocation and release oparations are serialized by | |
116 | * the dq_lock and by checking the use count in dquot_release(). Write | |
117 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
118 | * spinlock to internal buffers before writing. | |
119 | * | |
120 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
121 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
122 | * dqio_mutex | |
cc33412f JK |
123 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
124 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
125 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
126 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
127 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
128 | * called with dqptr_sem held. | |
d3be915f | 129 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
130 | */ |
131 | ||
c516610c JK |
132 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
133 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
134 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 135 | EXPORT_SYMBOL(dq_data_lock); |
1da177e4 LT |
136 | |
137 | static char *quotatypes[] = INITQFNAMES; | |
138 | static struct quota_format_type *quota_formats; /* List of registered formats */ | |
139 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
140 | ||
141 | /* SLAB cache for dquot structures */ | |
e18b890b | 142 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
143 | |
144 | int register_quota_format(struct quota_format_type *fmt) | |
145 | { | |
146 | spin_lock(&dq_list_lock); | |
147 | fmt->qf_next = quota_formats; | |
148 | quota_formats = fmt; | |
149 | spin_unlock(&dq_list_lock); | |
150 | return 0; | |
151 | } | |
08d0350c | 152 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
153 | |
154 | void unregister_quota_format(struct quota_format_type *fmt) | |
155 | { | |
156 | struct quota_format_type **actqf; | |
157 | ||
158 | spin_lock(&dq_list_lock); | |
159 | for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next); | |
160 | if (*actqf) | |
161 | *actqf = (*actqf)->qf_next; | |
162 | spin_unlock(&dq_list_lock); | |
163 | } | |
08d0350c | 164 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
165 | |
166 | static struct quota_format_type *find_quota_format(int id) | |
167 | { | |
168 | struct quota_format_type *actqf; | |
169 | ||
170 | spin_lock(&dq_list_lock); | |
171 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next); | |
172 | if (!actqf || !try_module_get(actqf->qf_owner)) { | |
173 | int qm; | |
174 | ||
175 | spin_unlock(&dq_list_lock); | |
176 | ||
177 | for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++); | |
178 | if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name)) | |
179 | return NULL; | |
180 | ||
181 | spin_lock(&dq_list_lock); | |
182 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next); | |
183 | if (actqf && !try_module_get(actqf->qf_owner)) | |
184 | actqf = NULL; | |
185 | } | |
186 | spin_unlock(&dq_list_lock); | |
187 | return actqf; | |
188 | } | |
189 | ||
190 | static void put_quota_format(struct quota_format_type *fmt) | |
191 | { | |
192 | module_put(fmt->qf_owner); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Dquot List Management: | |
197 | * The quota code uses three lists for dquot management: the inuse_list, | |
198 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
199 | * on all three lists, depending on its current state. | |
200 | * | |
201 | * All dquots are placed to the end of inuse_list when first created, and this | |
202 | * list is used for invalidate operation, which must look at every dquot. | |
203 | * | |
204 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
205 | * and this list is searched whenever we need an available dquot. Dquots are | |
206 | * removed from the list as soon as they are used again, and | |
207 | * dqstats.free_dquots gives the number of dquots on the list. When | |
208 | * dquot is invalidated it's completely released from memory. | |
209 | * | |
210 | * Dquots with a specific identity (device, type and id) are placed on | |
211 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
212 | * mechanism to locate a specific dquot. | |
213 | */ | |
214 | ||
215 | static LIST_HEAD(inuse_list); | |
216 | static LIST_HEAD(free_dquots); | |
217 | static unsigned int dq_hash_bits, dq_hash_mask; | |
218 | static struct hlist_head *dquot_hash; | |
219 | ||
220 | struct dqstats dqstats; | |
08d0350c | 221 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 222 | |
1da177e4 LT |
223 | static inline unsigned int |
224 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
225 | { | |
226 | unsigned long tmp; | |
227 | ||
228 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
229 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
230 | } | |
231 | ||
232 | /* | |
233 | * Following list functions expect dq_list_lock to be held | |
234 | */ | |
235 | static inline void insert_dquot_hash(struct dquot *dquot) | |
236 | { | |
237 | struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
238 | hlist_add_head(&dquot->dq_hash, head); | |
239 | } | |
240 | ||
241 | static inline void remove_dquot_hash(struct dquot *dquot) | |
242 | { | |
243 | hlist_del_init(&dquot->dq_hash); | |
244 | } | |
245 | ||
246 | static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type) | |
247 | { | |
248 | struct hlist_node *node; | |
249 | struct dquot *dquot; | |
250 | ||
251 | hlist_for_each (node, dquot_hash+hashent) { | |
252 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
253 | if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type) | |
254 | return dquot; | |
255 | } | |
dd6f3c6d | 256 | return NULL; |
1da177e4 LT |
257 | } |
258 | ||
259 | /* Add a dquot to the tail of the free list */ | |
260 | static inline void put_dquot_last(struct dquot *dquot) | |
261 | { | |
8e13059a | 262 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
263 | dqstats.free_dquots++; |
264 | } | |
265 | ||
266 | static inline void remove_free_dquot(struct dquot *dquot) | |
267 | { | |
268 | if (list_empty(&dquot->dq_free)) | |
269 | return; | |
270 | list_del_init(&dquot->dq_free); | |
271 | dqstats.free_dquots--; | |
272 | } | |
273 | ||
274 | static inline void put_inuse(struct dquot *dquot) | |
275 | { | |
276 | /* We add to the back of inuse list so we don't have to restart | |
277 | * when traversing this list and we block */ | |
8e13059a | 278 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
279 | dqstats.allocated_dquots++; |
280 | } | |
281 | ||
282 | static inline void remove_inuse(struct dquot *dquot) | |
283 | { | |
284 | dqstats.allocated_dquots--; | |
285 | list_del(&dquot->dq_inuse); | |
286 | } | |
287 | /* | |
288 | * End of list functions needing dq_list_lock | |
289 | */ | |
290 | ||
291 | static void wait_on_dquot(struct dquot *dquot) | |
292 | { | |
d3be915f IM |
293 | mutex_lock(&dquot->dq_lock); |
294 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
295 | } |
296 | ||
03f6e92b JK |
297 | static inline int dquot_dirty(struct dquot *dquot) |
298 | { | |
299 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
300 | } | |
301 | ||
302 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
303 | { | |
304 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
305 | } | |
1da177e4 LT |
306 | |
307 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
308 | { | |
309 | spin_lock(&dq_list_lock); | |
310 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
311 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
312 | info[dquot->dq_type].dqi_dirty_list); | |
313 | spin_unlock(&dq_list_lock); | |
314 | return 0; | |
315 | } | |
08d0350c | 316 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 LT |
317 | |
318 | /* This function needs dq_list_lock */ | |
319 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
320 | { | |
321 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
322 | return 0; | |
323 | list_del_init(&dquot->dq_dirty); | |
324 | return 1; | |
325 | } | |
326 | ||
327 | void mark_info_dirty(struct super_block *sb, int type) | |
328 | { | |
329 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
330 | } | |
331 | EXPORT_SYMBOL(mark_info_dirty); | |
332 | ||
333 | /* | |
334 | * Read dquot from disk and alloc space for it | |
335 | */ | |
336 | ||
337 | int dquot_acquire(struct dquot *dquot) | |
338 | { | |
339 | int ret = 0, ret2 = 0; | |
340 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
341 | ||
d3be915f IM |
342 | mutex_lock(&dquot->dq_lock); |
343 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
344 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
345 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
346 | if (ret < 0) | |
347 | goto out_iolock; | |
348 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
349 | /* Instantiate dquot if needed */ | |
350 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
351 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
352 | /* Write the info if needed */ | |
353 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
354 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
355 | if (ret < 0) | |
356 | goto out_iolock; | |
357 | if (ret2 < 0) { | |
358 | ret = ret2; | |
359 | goto out_iolock; | |
360 | } | |
361 | } | |
362 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
363 | out_iolock: | |
d3be915f IM |
364 | mutex_unlock(&dqopt->dqio_mutex); |
365 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
366 | return ret; |
367 | } | |
08d0350c | 368 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
369 | |
370 | /* | |
371 | * Write dquot to disk | |
372 | */ | |
373 | int dquot_commit(struct dquot *dquot) | |
374 | { | |
375 | int ret = 0, ret2 = 0; | |
376 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
377 | ||
d3be915f | 378 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
379 | spin_lock(&dq_list_lock); |
380 | if (!clear_dquot_dirty(dquot)) { | |
381 | spin_unlock(&dq_list_lock); | |
382 | goto out_sem; | |
383 | } | |
384 | spin_unlock(&dq_list_lock); | |
385 | /* Inactive dquot can be only if there was error during read/init | |
386 | * => we have better not writing it */ | |
387 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
388 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
389 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
390 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
391 | if (ret >= 0) | |
392 | ret = ret2; | |
393 | } | |
394 | out_sem: | |
d3be915f | 395 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
396 | return ret; |
397 | } | |
08d0350c | 398 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
399 | |
400 | /* | |
401 | * Release dquot | |
402 | */ | |
403 | int dquot_release(struct dquot *dquot) | |
404 | { | |
405 | int ret = 0, ret2 = 0; | |
406 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
407 | ||
d3be915f | 408 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
409 | /* Check whether we are not racing with some other dqget() */ |
410 | if (atomic_read(&dquot->dq_count) > 1) | |
411 | goto out_dqlock; | |
d3be915f | 412 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
413 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
414 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
415 | /* Write the info */ | |
416 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
417 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
418 | if (ret >= 0) | |
419 | ret = ret2; | |
420 | } | |
421 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 422 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 423 | out_dqlock: |
d3be915f | 424 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
425 | return ret; |
426 | } | |
08d0350c | 427 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 428 | |
7d9056ba | 429 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
430 | { |
431 | kmem_cache_free(dquot_cachep, dquot); | |
432 | } | |
7d9056ba | 433 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
434 | |
435 | static inline void do_destroy_dquot(struct dquot *dquot) | |
436 | { | |
437 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
438 | } | |
439 | ||
1da177e4 LT |
440 | /* Invalidate all dquots on the list. Note that this function is called after |
441 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
442 | * quota users. There can still be some users of quotas due to inodes being |
443 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 444 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 445 | */ |
1da177e4 LT |
446 | static void invalidate_dquots(struct super_block *sb, int type) |
447 | { | |
c33ed271 | 448 | struct dquot *dquot, *tmp; |
1da177e4 | 449 | |
6362e4d4 | 450 | restart: |
1da177e4 | 451 | spin_lock(&dq_list_lock); |
c33ed271 | 452 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
453 | if (dquot->dq_sb != sb) |
454 | continue; | |
455 | if (dquot->dq_type != type) | |
456 | continue; | |
6362e4d4 JK |
457 | /* Wait for dquot users */ |
458 | if (atomic_read(&dquot->dq_count)) { | |
459 | DEFINE_WAIT(wait); | |
460 | ||
461 | atomic_inc(&dquot->dq_count); | |
462 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
463 | TASK_UNINTERRUPTIBLE); | |
464 | spin_unlock(&dq_list_lock); | |
465 | /* Once dqput() wakes us up, we know it's time to free | |
466 | * the dquot. | |
467 | * IMPORTANT: we rely on the fact that there is always | |
468 | * at most one process waiting for dquot to free. | |
469 | * Otherwise dq_count would be > 1 and we would never | |
470 | * wake up. | |
471 | */ | |
472 | if (atomic_read(&dquot->dq_count) > 1) | |
473 | schedule(); | |
474 | finish_wait(&dquot->dq_wait_unused, &wait); | |
475 | dqput(dquot); | |
476 | /* At this moment dquot() need not exist (it could be | |
477 | * reclaimed by prune_dqcache(). Hence we must | |
478 | * restart. */ | |
479 | goto restart; | |
480 | } | |
481 | /* | |
482 | * Quota now has no users and it has been written on last | |
483 | * dqput() | |
484 | */ | |
1da177e4 LT |
485 | remove_dquot_hash(dquot); |
486 | remove_free_dquot(dquot); | |
487 | remove_inuse(dquot); | |
74f783af | 488 | do_destroy_dquot(dquot); |
1da177e4 LT |
489 | } |
490 | spin_unlock(&dq_list_lock); | |
491 | } | |
492 | ||
12c77527 JK |
493 | /* Call callback for every active dquot on given filesystem */ |
494 | int dquot_scan_active(struct super_block *sb, | |
495 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
496 | unsigned long priv) | |
497 | { | |
498 | struct dquot *dquot, *old_dquot = NULL; | |
499 | int ret = 0; | |
500 | ||
501 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
502 | spin_lock(&dq_list_lock); | |
503 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
504 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
505 | continue; | |
506 | if (dquot->dq_sb != sb) | |
507 | continue; | |
508 | /* Now we have active dquot so we can just increase use count */ | |
509 | atomic_inc(&dquot->dq_count); | |
510 | dqstats.lookups++; | |
511 | spin_unlock(&dq_list_lock); | |
512 | dqput(old_dquot); | |
513 | old_dquot = dquot; | |
514 | ret = fn(dquot, priv); | |
515 | if (ret < 0) | |
516 | goto out; | |
517 | spin_lock(&dq_list_lock); | |
518 | /* We are safe to continue now because our dquot could not | |
519 | * be moved out of the inuse list while we hold the reference */ | |
520 | } | |
521 | spin_unlock(&dq_list_lock); | |
522 | out: | |
523 | dqput(old_dquot); | |
524 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
525 | return ret; | |
526 | } | |
08d0350c | 527 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 528 | |
1da177e4 LT |
529 | int vfs_quota_sync(struct super_block *sb, int type) |
530 | { | |
531 | struct list_head *dirty; | |
532 | struct dquot *dquot; | |
533 | struct quota_info *dqopt = sb_dqopt(sb); | |
534 | int cnt; | |
535 | ||
d3be915f | 536 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
537 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
538 | if (type != -1 && cnt != type) | |
539 | continue; | |
f55abc0f | 540 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
541 | continue; |
542 | spin_lock(&dq_list_lock); | |
543 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
544 | while (!list_empty(dirty)) { | |
b5e61818 | 545 | dquot = list_first_entry(dirty, struct dquot, dq_dirty); |
1da177e4 LT |
546 | /* Dirty and inactive can be only bad dquot... */ |
547 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
548 | clear_dquot_dirty(dquot); | |
549 | continue; | |
550 | } | |
551 | /* Now we have active dquot from which someone is | |
552 | * holding reference so we can safely just increase | |
553 | * use count */ | |
554 | atomic_inc(&dquot->dq_count); | |
555 | dqstats.lookups++; | |
556 | spin_unlock(&dq_list_lock); | |
557 | sb->dq_op->write_dquot(dquot); | |
558 | dqput(dquot); | |
559 | spin_lock(&dq_list_lock); | |
560 | } | |
561 | spin_unlock(&dq_list_lock); | |
562 | } | |
563 | ||
564 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
565 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
566 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 LT |
567 | sb->dq_op->write_info(sb, cnt); |
568 | spin_lock(&dq_list_lock); | |
569 | dqstats.syncs++; | |
570 | spin_unlock(&dq_list_lock); | |
d3be915f | 571 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
572 | |
573 | return 0; | |
574 | } | |
08d0350c | 575 | EXPORT_SYMBOL(vfs_quota_sync); |
1da177e4 LT |
576 | |
577 | /* Free unused dquots from cache */ | |
578 | static void prune_dqcache(int count) | |
579 | { | |
580 | struct list_head *head; | |
581 | struct dquot *dquot; | |
582 | ||
583 | head = free_dquots.prev; | |
584 | while (head != &free_dquots && count) { | |
585 | dquot = list_entry(head, struct dquot, dq_free); | |
586 | remove_dquot_hash(dquot); | |
587 | remove_free_dquot(dquot); | |
588 | remove_inuse(dquot); | |
74f783af | 589 | do_destroy_dquot(dquot); |
1da177e4 LT |
590 | count--; |
591 | head = free_dquots.prev; | |
592 | } | |
593 | } | |
594 | ||
595 | /* | |
596 | * This is called from kswapd when we think we need some | |
597 | * more memory | |
598 | */ | |
599 | ||
27496a8c | 600 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
601 | { |
602 | if (nr) { | |
603 | spin_lock(&dq_list_lock); | |
604 | prune_dqcache(nr); | |
605 | spin_unlock(&dq_list_lock); | |
606 | } | |
607 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
608 | } | |
609 | ||
8e1f936b RR |
610 | static struct shrinker dqcache_shrinker = { |
611 | .shrink = shrink_dqcache_memory, | |
612 | .seeks = DEFAULT_SEEKS, | |
613 | }; | |
614 | ||
1da177e4 LT |
615 | /* |
616 | * Put reference to dquot | |
617 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 618 | */ |
3d9ea253 | 619 | void dqput(struct dquot *dquot) |
1da177e4 | 620 | { |
b48d3805 JK |
621 | int ret; |
622 | ||
1da177e4 LT |
623 | if (!dquot) |
624 | return; | |
625 | #ifdef __DQUOT_PARANOIA | |
626 | if (!atomic_read(&dquot->dq_count)) { | |
627 | printk("VFS: dqput: trying to free free dquot\n"); | |
628 | printk("VFS: device %s, dquot of %s %d\n", | |
629 | dquot->dq_sb->s_id, | |
630 | quotatypes[dquot->dq_type], | |
631 | dquot->dq_id); | |
632 | BUG(); | |
633 | } | |
634 | #endif | |
635 | ||
636 | spin_lock(&dq_list_lock); | |
637 | dqstats.drops++; | |
638 | spin_unlock(&dq_list_lock); | |
639 | we_slept: | |
640 | spin_lock(&dq_list_lock); | |
641 | if (atomic_read(&dquot->dq_count) > 1) { | |
642 | /* We have more than one user... nothing to do */ | |
643 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 644 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 645 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
646 | atomic_read(&dquot->dq_count) == 1) |
647 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
648 | spin_unlock(&dq_list_lock); |
649 | return; | |
650 | } | |
651 | /* Need to release dquot? */ | |
652 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
653 | spin_unlock(&dq_list_lock); | |
654 | /* Commit dquot before releasing */ | |
b48d3805 JK |
655 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
656 | if (ret < 0) { | |
657 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
658 | "device %s (error %d). Quota may get out of " | |
659 | "sync!\n", dquot->dq_sb->s_id, ret); | |
660 | /* | |
661 | * We clear dirty bit anyway, so that we avoid | |
662 | * infinite loop here | |
663 | */ | |
664 | spin_lock(&dq_list_lock); | |
665 | clear_dquot_dirty(dquot); | |
666 | spin_unlock(&dq_list_lock); | |
667 | } | |
1da177e4 LT |
668 | goto we_slept; |
669 | } | |
670 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
671 | clear_dquot_dirty(dquot); | |
672 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
673 | spin_unlock(&dq_list_lock); | |
674 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
675 | goto we_slept; | |
676 | } | |
677 | atomic_dec(&dquot->dq_count); | |
678 | #ifdef __DQUOT_PARANOIA | |
679 | /* sanity check */ | |
8abf6a47 | 680 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
681 | #endif |
682 | put_dquot_last(dquot); | |
683 | spin_unlock(&dq_list_lock); | |
684 | } | |
08d0350c | 685 | EXPORT_SYMBOL(dqput); |
1da177e4 | 686 | |
7d9056ba | 687 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
688 | { |
689 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
690 | } | |
7d9056ba | 691 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 692 | |
1da177e4 LT |
693 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
694 | { | |
695 | struct dquot *dquot; | |
696 | ||
74f783af | 697 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 698 | if(!dquot) |
dd6f3c6d | 699 | return NULL; |
1da177e4 | 700 | |
d3be915f | 701 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
702 | INIT_LIST_HEAD(&dquot->dq_free); |
703 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
704 | INIT_HLIST_NODE(&dquot->dq_hash); | |
705 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 706 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
707 | dquot->dq_sb = sb; |
708 | dquot->dq_type = type; | |
709 | atomic_set(&dquot->dq_count, 1); | |
710 | ||
711 | return dquot; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Get reference to dquot | |
cc33412f JK |
716 | * |
717 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
718 | * destroying our dquot by: | |
719 | * a) checking for quota flags under dq_list_lock and | |
720 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 721 | */ |
3d9ea253 | 722 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
723 | { |
724 | unsigned int hashent = hashfn(sb, id, type); | |
dd6f3c6d | 725 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 726 | |
f55abc0f | 727 | if (!sb_has_quota_active(sb, type)) |
dd6f3c6d | 728 | return NULL; |
1da177e4 LT |
729 | we_slept: |
730 | spin_lock(&dq_list_lock); | |
cc33412f JK |
731 | spin_lock(&dq_state_lock); |
732 | if (!sb_has_quota_active(sb, type)) { | |
733 | spin_unlock(&dq_state_lock); | |
734 | spin_unlock(&dq_list_lock); | |
735 | goto out; | |
736 | } | |
737 | spin_unlock(&dq_state_lock); | |
738 | ||
dd6f3c6d JK |
739 | dquot = find_dquot(hashent, sb, id, type); |
740 | if (!dquot) { | |
741 | if (!empty) { | |
1da177e4 | 742 | spin_unlock(&dq_list_lock); |
dd6f3c6d JK |
743 | empty = get_empty_dquot(sb, type); |
744 | if (!empty) | |
1da177e4 LT |
745 | schedule(); /* Try to wait for a moment... */ |
746 | goto we_slept; | |
747 | } | |
748 | dquot = empty; | |
dd6f3c6d | 749 | empty = NULL; |
1da177e4 LT |
750 | dquot->dq_id = id; |
751 | /* all dquots go on the inuse_list */ | |
752 | put_inuse(dquot); | |
753 | /* hash it first so it can be found */ | |
754 | insert_dquot_hash(dquot); | |
755 | dqstats.lookups++; | |
756 | spin_unlock(&dq_list_lock); | |
757 | } else { | |
758 | if (!atomic_read(&dquot->dq_count)) | |
759 | remove_free_dquot(dquot); | |
760 | atomic_inc(&dquot->dq_count); | |
761 | dqstats.cache_hits++; | |
762 | dqstats.lookups++; | |
763 | spin_unlock(&dq_list_lock); | |
1da177e4 LT |
764 | } |
765 | /* Wait for dq_lock - after this we know that either dquot_release() is already | |
766 | * finished or it will be canceled due to dq_count > 1 test */ | |
767 | wait_on_dquot(dquot); | |
768 | /* Read the dquot and instantiate it (everything done only if needed) */ | |
769 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) { | |
770 | dqput(dquot); | |
dd6f3c6d | 771 | dquot = NULL; |
cc33412f | 772 | goto out; |
1da177e4 LT |
773 | } |
774 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 775 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 776 | #endif |
cc33412f JK |
777 | out: |
778 | if (empty) | |
779 | do_destroy_dquot(empty); | |
1da177e4 LT |
780 | |
781 | return dquot; | |
782 | } | |
08d0350c | 783 | EXPORT_SYMBOL(dqget); |
1da177e4 LT |
784 | |
785 | static int dqinit_needed(struct inode *inode, int type) | |
786 | { | |
787 | int cnt; | |
788 | ||
789 | if (IS_NOQUOTA(inode)) | |
790 | return 0; | |
791 | if (type != -1) | |
dd6f3c6d | 792 | return !inode->i_dquot[type]; |
1da177e4 | 793 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
dd6f3c6d | 794 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
795 | return 1; |
796 | return 0; | |
797 | } | |
798 | ||
d3be915f | 799 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
800 | static void add_dquot_ref(struct super_block *sb, int type) |
801 | { | |
941d2380 | 802 | struct inode *inode, *old_inode = NULL; |
1da177e4 | 803 | |
d003fb70 CH |
804 | spin_lock(&inode_lock); |
805 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
806 | if (!atomic_read(&inode->i_writecount)) | |
807 | continue; | |
808 | if (!dqinit_needed(inode, type)) | |
809 | continue; | |
810 | if (inode->i_state & (I_FREEING|I_WILL_FREE)) | |
811 | continue; | |
812 | ||
813 | __iget(inode); | |
814 | spin_unlock(&inode_lock); | |
815 | ||
941d2380 | 816 | iput(old_inode); |
d003fb70 | 817 | sb->dq_op->initialize(inode, type); |
941d2380 JK |
818 | /* We hold a reference to 'inode' so it couldn't have been |
819 | * removed from s_inodes list while we dropped the inode_lock. | |
820 | * We cannot iput the inode now as we can be holding the last | |
821 | * reference and we cannot iput it under inode_lock. So we | |
822 | * keep the reference and iput it later. */ | |
823 | old_inode = inode; | |
824 | spin_lock(&inode_lock); | |
1da177e4 | 825 | } |
d003fb70 | 826 | spin_unlock(&inode_lock); |
941d2380 | 827 | iput(old_inode); |
1da177e4 LT |
828 | } |
829 | ||
830 | /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */ | |
831 | static inline int dqput_blocks(struct dquot *dquot) | |
832 | { | |
833 | if (atomic_read(&dquot->dq_count) <= 1) | |
834 | return 1; | |
835 | return 0; | |
836 | } | |
837 | ||
838 | /* Remove references to dquots from inode - add dquot to list for freeing if needed */ | |
839 | /* We can't race with anybody because we hold dqptr_sem for writing... */ | |
e5f00f42 AB |
840 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
841 | struct list_head *tofree_head) | |
1da177e4 LT |
842 | { |
843 | struct dquot *dquot = inode->i_dquot[type]; | |
844 | ||
dd6f3c6d JK |
845 | inode->i_dquot[type] = NULL; |
846 | if (dquot) { | |
1da177e4 LT |
847 | if (dqput_blocks(dquot)) { |
848 | #ifdef __DQUOT_PARANOIA | |
849 | if (atomic_read(&dquot->dq_count) != 1) | |
850 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
851 | #endif | |
852 | spin_lock(&dq_list_lock); | |
853 | list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */ | |
854 | spin_unlock(&dq_list_lock); | |
855 | return 1; | |
856 | } | |
857 | else | |
858 | dqput(dquot); /* We have guaranteed we won't block */ | |
859 | } | |
860 | return 0; | |
861 | } | |
862 | ||
863 | /* Free list of dquots - called from inode.c */ | |
864 | /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */ | |
865 | static void put_dquot_list(struct list_head *tofree_head) | |
866 | { | |
867 | struct list_head *act_head; | |
868 | struct dquot *dquot; | |
869 | ||
870 | act_head = tofree_head->next; | |
871 | /* So now we have dquots on the list... Just free them */ | |
872 | while (act_head != tofree_head) { | |
873 | dquot = list_entry(act_head, struct dquot, dq_free); | |
874 | act_head = act_head->next; | |
875 | list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */ | |
876 | dqput(dquot); | |
877 | } | |
878 | } | |
879 | ||
fb58b731 CH |
880 | static void remove_dquot_ref(struct super_block *sb, int type, |
881 | struct list_head *tofree_head) | |
882 | { | |
883 | struct inode *inode; | |
884 | ||
885 | spin_lock(&inode_lock); | |
886 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
887 | if (!IS_NOQUOTA(inode)) | |
888 | remove_inode_dquot_ref(inode, type, tofree_head); | |
889 | } | |
890 | spin_unlock(&inode_lock); | |
891 | } | |
892 | ||
1da177e4 LT |
893 | /* Gather all references from inodes and drop them */ |
894 | static void drop_dquot_ref(struct super_block *sb, int type) | |
895 | { | |
896 | LIST_HEAD(tofree_head); | |
897 | ||
fb58b731 CH |
898 | if (sb->dq_op) { |
899 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
900 | remove_dquot_ref(sb, type, &tofree_head); | |
901 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
902 | put_dquot_list(&tofree_head); | |
903 | } | |
1da177e4 LT |
904 | } |
905 | ||
12095460 | 906 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
907 | { |
908 | dquot->dq_dqb.dqb_curinodes += number; | |
909 | } | |
910 | ||
911 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
912 | { | |
913 | dquot->dq_dqb.dqb_curspace += number; | |
914 | } | |
915 | ||
f18df228 MC |
916 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
917 | { | |
918 | dquot->dq_dqb.dqb_rsvspace += number; | |
919 | } | |
920 | ||
740d9dcd MC |
921 | /* |
922 | * Claim reserved quota space | |
923 | */ | |
924 | static void dquot_claim_reserved_space(struct dquot *dquot, | |
925 | qsize_t number) | |
926 | { | |
927 | WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); | |
928 | dquot->dq_dqb.dqb_curspace += number; | |
929 | dquot->dq_dqb.dqb_rsvspace -= number; | |
930 | } | |
931 | ||
932 | static inline | |
933 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
934 | { | |
935 | dquot->dq_dqb.dqb_rsvspace -= number; | |
936 | } | |
937 | ||
12095460 | 938 | static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 939 | { |
db49d2df JK |
940 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
941 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
942 | dquot->dq_dqb.dqb_curinodes -= number; |
943 | else | |
944 | dquot->dq_dqb.dqb_curinodes = 0; | |
945 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
946 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
947 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
948 | } | |
949 | ||
950 | static inline void dquot_decr_space(struct dquot *dquot, qsize_t number) | |
951 | { | |
db49d2df JK |
952 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
953 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
954 | dquot->dq_dqb.dqb_curspace -= number; |
955 | else | |
956 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 957 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
958 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
959 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
960 | } | |
961 | ||
c525460e JK |
962 | static int warning_issued(struct dquot *dquot, const int warntype) |
963 | { | |
964 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
965 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
966 | ((warntype == QUOTA_NL_IHARDWARN || | |
967 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
968 | ||
969 | if (!flag) | |
970 | return 0; | |
971 | return test_and_set_bit(flag, &dquot->dq_flags); | |
972 | } | |
973 | ||
8e893469 | 974 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
975 | static int flag_print_warnings = 1; |
976 | ||
977 | static inline int need_print_warning(struct dquot *dquot) | |
978 | { | |
979 | if (!flag_print_warnings) | |
980 | return 0; | |
981 | ||
982 | switch (dquot->dq_type) { | |
983 | case USRQUOTA: | |
da9592ed | 984 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
985 | case GRPQUOTA: |
986 | return in_group_p(dquot->dq_id); | |
987 | } | |
988 | return 0; | |
989 | } | |
990 | ||
1da177e4 | 991 | /* Print warning to user which exceeded quota */ |
c525460e | 992 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
993 | { |
994 | char *msg = NULL; | |
24ec839c | 995 | struct tty_struct *tty; |
1da177e4 | 996 | |
657d3bfa JK |
997 | if (warntype == QUOTA_NL_IHARDBELOW || |
998 | warntype == QUOTA_NL_ISOFTBELOW || | |
999 | warntype == QUOTA_NL_BHARDBELOW || | |
1000 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
1001 | return; |
1002 | ||
24ec839c PZ |
1003 | tty = get_current_tty(); |
1004 | if (!tty) | |
452a00d2 | 1005 | return; |
24ec839c | 1006 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 1007 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1008 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1009 | else |
24ec839c PZ |
1010 | tty_write_message(tty, ": write failed, "); |
1011 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 1012 | switch (warntype) { |
8e893469 | 1013 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1014 | msg = " file limit reached.\r\n"; |
1015 | break; | |
8e893469 | 1016 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1017 | msg = " file quota exceeded too long.\r\n"; |
1018 | break; | |
8e893469 | 1019 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1020 | msg = " file quota exceeded.\r\n"; |
1021 | break; | |
8e893469 | 1022 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1023 | msg = " block limit reached.\r\n"; |
1024 | break; | |
8e893469 | 1025 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1026 | msg = " block quota exceeded too long.\r\n"; |
1027 | break; | |
8e893469 | 1028 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1029 | msg = " block quota exceeded.\r\n"; |
1030 | break; | |
1031 | } | |
24ec839c | 1032 | tty_write_message(tty, msg); |
452a00d2 | 1033 | tty_kref_put(tty); |
1da177e4 | 1034 | } |
8e893469 JK |
1035 | #endif |
1036 | ||
1037 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1038 | ||
8e893469 JK |
1039 | /* Netlink family structure for quota */ |
1040 | static struct genl_family quota_genl_family = { | |
1041 | .id = GENL_ID_GENERATE, | |
1042 | .hdrsize = 0, | |
1043 | .name = "VFS_DQUOT", | |
1044 | .version = 1, | |
1045 | .maxattr = QUOTA_NL_A_MAX, | |
1046 | }; | |
1047 | ||
1048 | /* Send warning to userspace about user which exceeded quota */ | |
1049 | static void send_warning(const struct dquot *dquot, const char warntype) | |
1050 | { | |
1051 | static atomic_t seq; | |
1052 | struct sk_buff *skb; | |
1053 | void *msg_head; | |
1054 | int ret; | |
22dd4837 JK |
1055 | int msg_size = 4 * nla_total_size(sizeof(u32)) + |
1056 | 2 * nla_total_size(sizeof(u64)); | |
8e893469 JK |
1057 | |
1058 | /* We have to allocate using GFP_NOFS as we are called from a | |
1059 | * filesystem performing write and thus further recursion into | |
1060 | * the fs to free some data could cause deadlocks. */ | |
22dd4837 | 1061 | skb = genlmsg_new(msg_size, GFP_NOFS); |
8e893469 JK |
1062 | if (!skb) { |
1063 | printk(KERN_ERR | |
1064 | "VFS: Not enough memory to send quota warning.\n"); | |
1065 | return; | |
1066 | } | |
1067 | msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), | |
1068 | "a_genl_family, 0, QUOTA_NL_C_WARNING); | |
1069 | if (!msg_head) { | |
1070 | printk(KERN_ERR | |
1071 | "VFS: Cannot store netlink header in quota warning.\n"); | |
1072 | goto err_out; | |
1073 | } | |
1074 | ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type); | |
1075 | if (ret) | |
1076 | goto attr_err_out; | |
1077 | ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id); | |
1078 | if (ret) | |
1079 | goto attr_err_out; | |
1080 | ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); | |
1081 | if (ret) | |
1082 | goto attr_err_out; | |
1083 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, | |
1084 | MAJOR(dquot->dq_sb->s_dev)); | |
1085 | if (ret) | |
1086 | goto attr_err_out; | |
1087 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, | |
1088 | MINOR(dquot->dq_sb->s_dev)); | |
1089 | if (ret) | |
1090 | goto attr_err_out; | |
da9592ed | 1091 | ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid()); |
8e893469 JK |
1092 | if (ret) |
1093 | goto attr_err_out; | |
1094 | genlmsg_end(skb, msg_head); | |
1095 | ||
1096 | ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); | |
1097 | if (ret < 0 && ret != -ESRCH) | |
1098 | printk(KERN_ERR | |
1099 | "VFS: Failed to send notification message: %d\n", ret); | |
1100 | return; | |
1101 | attr_err_out: | |
22dd4837 | 1102 | printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); |
8e893469 JK |
1103 | err_out: |
1104 | kfree_skb(skb); | |
1105 | } | |
1106 | #endif | |
f18df228 MC |
1107 | /* |
1108 | * Write warnings to the console and send warning messages over netlink. | |
1109 | * | |
1110 | * Note that this function can sleep. | |
1111 | */ | |
087ee8d5 | 1112 | static inline void flush_warnings(struct dquot * const *dquots, char *warntype) |
1da177e4 LT |
1113 | { |
1114 | int i; | |
1115 | ||
1116 | for (i = 0; i < MAXQUOTAS; i++) | |
dd6f3c6d | 1117 | if (dquots[i] && warntype[i] != QUOTA_NL_NOWARN && |
c525460e | 1118 | !warning_issued(dquots[i], warntype[i])) { |
8e893469 | 1119 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 1120 | print_warning(dquots[i], warntype[i]); |
8e893469 JK |
1121 | #endif |
1122 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1123 | send_warning(dquots[i], warntype[i]); | |
1124 | #endif | |
1125 | } | |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | static inline char ignore_hardlimit(struct dquot *dquot) | |
1129 | { | |
1130 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1131 | ||
1132 | return capable(CAP_SYS_RESOURCE) && | |
1133 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1134 | } | |
1135 | ||
1136 | /* needs dq_data_lock */ | |
12095460 | 1137 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1138 | { |
8e893469 | 1139 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1140 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1141 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1142 | return QUOTA_OK; |
1143 | ||
1144 | if (dquot->dq_dqb.dqb_ihardlimit && | |
1145 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit && | |
1146 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1147 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1148 | return NO_QUOTA; |
1149 | } | |
1150 | ||
1151 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1152 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1153 | dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1154 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1155 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1156 | return NO_QUOTA; |
1157 | } | |
1158 | ||
1159 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1160 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1161 | dquot->dq_dqb.dqb_itime == 0) { | |
8e893469 | 1162 | *warntype = QUOTA_NL_ISOFTWARN; |
1da177e4 LT |
1163 | dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; |
1164 | } | |
1165 | ||
1166 | return QUOTA_OK; | |
1167 | } | |
1168 | ||
1169 | /* needs dq_data_lock */ | |
1170 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1171 | { | |
f18df228 MC |
1172 | qsize_t tspace; |
1173 | ||
8e893469 | 1174 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1175 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1176 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1177 | return QUOTA_OK; |
1178 | ||
f18df228 MC |
1179 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1180 | + space; | |
1181 | ||
1da177e4 | 1182 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1183 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1184 | !ignore_hardlimit(dquot)) { |
1185 | if (!prealloc) | |
8e893469 | 1186 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1187 | return NO_QUOTA; |
1188 | } | |
1189 | ||
1190 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1191 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1192 | dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime && |
1193 | !ignore_hardlimit(dquot)) { | |
1194 | if (!prealloc) | |
8e893469 | 1195 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1196 | return NO_QUOTA; |
1197 | } | |
1198 | ||
1199 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1200 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1201 | dquot->dq_dqb.dqb_btime == 0) { |
1202 | if (!prealloc) { | |
8e893469 | 1203 | *warntype = QUOTA_NL_BSOFTWARN; |
1da177e4 LT |
1204 | dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace; |
1205 | } | |
1206 | else | |
1207 | /* | |
1208 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1209 | * be always printed | |
1210 | */ | |
1211 | return NO_QUOTA; | |
1212 | } | |
1213 | ||
1214 | return QUOTA_OK; | |
1215 | } | |
1216 | ||
12095460 | 1217 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa JK |
1218 | { |
1219 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
f55abc0f JK |
1220 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1221 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1222 | return QUOTA_NL_NOWARN; |
1223 | ||
1224 | if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1225 | return QUOTA_NL_ISOFTBELOW; | |
1226 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
1227 | dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit) | |
1228 | return QUOTA_NL_IHARDBELOW; | |
1229 | return QUOTA_NL_NOWARN; | |
1230 | } | |
1231 | ||
1232 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1233 | { | |
1234 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1235 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1236 | return QUOTA_NL_NOWARN; |
1237 | ||
12095460 | 1238 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1239 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1240 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1241 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1242 | return QUOTA_NL_BHARDBELOW; |
1243 | return QUOTA_NL_NOWARN; | |
1244 | } | |
1da177e4 LT |
1245 | /* |
1246 | * Initialize quota pointers in inode | |
cc33412f JK |
1247 | * We do things in a bit complicated way but by that we avoid calling |
1248 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1da177e4 LT |
1249 | */ |
1250 | int dquot_initialize(struct inode *inode, int type) | |
1251 | { | |
1252 | unsigned int id = 0; | |
1253 | int cnt, ret = 0; | |
dd6f3c6d | 1254 | struct dquot *got[MAXQUOTAS] = { NULL, NULL }; |
cc33412f | 1255 | struct super_block *sb = inode->i_sb; |
1da177e4 | 1256 | |
d3be915f IM |
1257 | /* First test before acquiring mutex - solves deadlocks when we |
1258 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1259 | if (IS_NOQUOTA(inode)) |
1260 | return 0; | |
cc33412f JK |
1261 | |
1262 | /* First get references to structures we might need. */ | |
1263 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1264 | if (type != -1 && cnt != type) | |
1265 | continue; | |
1266 | switch (cnt) { | |
1267 | case USRQUOTA: | |
1268 | id = inode->i_uid; | |
1269 | break; | |
1270 | case GRPQUOTA: | |
1271 | id = inode->i_gid; | |
1272 | break; | |
1273 | } | |
1274 | got[cnt] = dqget(sb, id, cnt); | |
1275 | } | |
1276 | ||
1277 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1278 | /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ |
1279 | if (IS_NOQUOTA(inode)) | |
1280 | goto out_err; | |
1281 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1282 | if (type != -1 && cnt != type) | |
1283 | continue; | |
cc33412f JK |
1284 | /* Avoid races with quotaoff() */ |
1285 | if (!sb_has_quota_active(sb, cnt)) | |
1286 | continue; | |
dd6f3c6d | 1287 | if (!inode->i_dquot[cnt]) { |
cc33412f | 1288 | inode->i_dquot[cnt] = got[cnt]; |
dd6f3c6d | 1289 | got[cnt] = NULL; |
1da177e4 LT |
1290 | } |
1291 | } | |
1292 | out_err: | |
cc33412f JK |
1293 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1294 | /* Drop unused references */ | |
1295 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1296 | dqput(got[cnt]); | |
1da177e4 LT |
1297 | return ret; |
1298 | } | |
08d0350c | 1299 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1300 | |
1301 | /* | |
1302 | * Release all quotas referenced by inode | |
1da177e4 | 1303 | */ |
cc33412f | 1304 | int dquot_drop(struct inode *inode) |
1da177e4 LT |
1305 | { |
1306 | int cnt; | |
cc33412f | 1307 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1308 | |
cc33412f | 1309 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1310 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f | 1311 | put[cnt] = inode->i_dquot[cnt]; |
dd6f3c6d | 1312 | inode->i_dquot[cnt] = NULL; |
1da177e4 LT |
1313 | } |
1314 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
cc33412f JK |
1315 | |
1316 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1317 | dqput(put[cnt]); | |
1da177e4 LT |
1318 | return 0; |
1319 | } | |
08d0350c | 1320 | EXPORT_SYMBOL(dquot_drop); |
1da177e4 | 1321 | |
b85f4b87 JK |
1322 | /* Wrapper to remove references to quota structures from inode */ |
1323 | void vfs_dq_drop(struct inode *inode) | |
1324 | { | |
1325 | /* Here we can get arbitrary inode from clear_inode() so we have | |
1326 | * to be careful. OTOH we don't need locking as quota operations | |
1327 | * are allowed to change only at mount time */ | |
1328 | if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op | |
1329 | && inode->i_sb->dq_op->drop) { | |
1330 | int cnt; | |
1331 | /* Test before calling to rule out calls from proc and such | |
1332 | * where we are not allowed to block. Note that this is | |
1333 | * actually reliable test even without the lock - the caller | |
1334 | * must assure that nobody can come after the DQUOT_DROP and | |
1335 | * add quota pointers back anyway */ | |
1336 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1337 | if (inode->i_dquot[cnt]) |
b85f4b87 JK |
1338 | break; |
1339 | if (cnt < MAXQUOTAS) | |
1340 | inode->i_sb->dq_op->drop(inode); | |
1341 | } | |
1342 | } | |
08d0350c | 1343 | EXPORT_SYMBOL(vfs_dq_drop); |
b85f4b87 | 1344 | |
1da177e4 LT |
1345 | /* |
1346 | * Following four functions update i_blocks+i_bytes fields and | |
1347 | * quota information (together with appropriate checks) | |
1348 | * NOTE: We absolutely rely on the fact that caller dirties | |
1349 | * the inode (usually macros in quotaops.h care about this) and | |
1350 | * holds a handle for the current transaction so that dquot write and | |
1351 | * inode write go into the same transaction. | |
1352 | */ | |
1353 | ||
1354 | /* | |
1355 | * This operation can block, but only after everything is updated | |
1356 | */ | |
f18df228 MC |
1357 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
1358 | int warn, int reserve) | |
1da177e4 | 1359 | { |
f18df228 | 1360 | int cnt, ret = QUOTA_OK; |
1da177e4 LT |
1361 | char warntype[MAXQUOTAS]; |
1362 | ||
1da177e4 | 1363 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1364 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1365 | |
1da177e4 LT |
1366 | spin_lock(&dq_data_lock); |
1367 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1368 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1369 | continue; |
f18df228 MC |
1370 | if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) |
1371 | == NO_QUOTA) { | |
1372 | ret = NO_QUOTA; | |
1373 | goto out_unlock; | |
1374 | } | |
1da177e4 LT |
1375 | } |
1376 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1377 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1378 | continue; |
f18df228 MC |
1379 | if (reserve) |
1380 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1381 | else | |
1382 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1383 | } |
f18df228 MC |
1384 | if (!reserve) |
1385 | inode_add_bytes(inode, number); | |
1386 | out_unlock: | |
1da177e4 | 1387 | spin_unlock(&dq_data_lock); |
1da177e4 | 1388 | flush_warnings(inode->i_dquot, warntype); |
f18df228 MC |
1389 | return ret; |
1390 | } | |
1391 | ||
1392 | int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) | |
1393 | { | |
1394 | int cnt, ret = QUOTA_OK; | |
1395 | ||
1396 | /* | |
1397 | * First test before acquiring mutex - solves deadlocks when we | |
1398 | * re-enter the quota code and are already holding the mutex | |
1399 | */ | |
1400 | if (IS_NOQUOTA(inode)) { | |
1401 | inode_add_bytes(inode, number); | |
1402 | goto out; | |
1403 | } | |
1404 | ||
1405 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1406 | if (IS_NOQUOTA(inode)) { | |
1407 | inode_add_bytes(inode, number); | |
1408 | goto out_unlock; | |
1409 | } | |
1410 | ||
1411 | ret = __dquot_alloc_space(inode, number, warn, 0); | |
1412 | if (ret == NO_QUOTA) | |
1413 | goto out_unlock; | |
1414 | ||
1415 | /* Dirtify all the dquots - this can block when journalling */ | |
1416 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1417 | if (inode->i_dquot[cnt]) | |
1418 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1419 | out_unlock: | |
1da177e4 | 1420 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1421 | out: |
1422 | return ret; | |
1423 | } | |
08d0350c | 1424 | EXPORT_SYMBOL(dquot_alloc_space); |
f18df228 MC |
1425 | |
1426 | int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) | |
1427 | { | |
1428 | int ret = QUOTA_OK; | |
1429 | ||
1430 | if (IS_NOQUOTA(inode)) | |
1431 | goto out; | |
1432 | ||
1433 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1434 | if (IS_NOQUOTA(inode)) | |
1435 | goto out_unlock; | |
1436 | ||
1437 | ret = __dquot_alloc_space(inode, number, warn, 1); | |
1438 | out_unlock: | |
1439 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1440 | out: | |
1da177e4 LT |
1441 | return ret; |
1442 | } | |
f18df228 | 1443 | EXPORT_SYMBOL(dquot_reserve_space); |
1da177e4 LT |
1444 | |
1445 | /* | |
1446 | * This operation can block, but only after everything is updated | |
1447 | */ | |
12095460 | 1448 | int dquot_alloc_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1449 | { |
1450 | int cnt, ret = NO_QUOTA; | |
1451 | char warntype[MAXQUOTAS]; | |
1452 | ||
d3be915f IM |
1453 | /* First test before acquiring mutex - solves deadlocks when we |
1454 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1455 | if (IS_NOQUOTA(inode)) |
1456 | return QUOTA_OK; | |
1457 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1458 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1459 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1460 | if (IS_NOQUOTA(inode)) { | |
1461 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1462 | return QUOTA_OK; | |
1463 | } | |
1464 | spin_lock(&dq_data_lock); | |
1465 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1466 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
1467 | continue; |
1468 | if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA) | |
1469 | goto warn_put_all; | |
1470 | } | |
1471 | ||
1472 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1473 | if (!inode->i_dquot[cnt]) |
1da177e4 LT |
1474 | continue; |
1475 | dquot_incr_inodes(inode->i_dquot[cnt], number); | |
1476 | } | |
1477 | ret = QUOTA_OK; | |
1478 | warn_put_all: | |
1479 | spin_unlock(&dq_data_lock); | |
1480 | if (ret == QUOTA_OK) | |
1481 | /* Dirtify all the dquots - this can block when journalling */ | |
1482 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1483 | if (inode->i_dquot[cnt]) | |
1484 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
087ee8d5 | 1485 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1486 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1487 | return ret; | |
1488 | } | |
08d0350c | 1489 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1490 | |
740d9dcd MC |
1491 | int dquot_claim_space(struct inode *inode, qsize_t number) |
1492 | { | |
1493 | int cnt; | |
1494 | int ret = QUOTA_OK; | |
1495 | ||
1496 | if (IS_NOQUOTA(inode)) { | |
1497 | inode_add_bytes(inode, number); | |
1498 | goto out; | |
1499 | } | |
1500 | ||
1501 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1502 | if (IS_NOQUOTA(inode)) { | |
1503 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1504 | inode_add_bytes(inode, number); | |
1505 | goto out; | |
1506 | } | |
1507 | ||
1508 | spin_lock(&dq_data_lock); | |
1509 | /* Claim reserved quotas to allocated quotas */ | |
1510 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1511 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1512 | dquot_claim_reserved_space(inode->i_dquot[cnt], |
1513 | number); | |
1514 | } | |
1515 | /* Update inode bytes */ | |
1516 | inode_add_bytes(inode, number); | |
1517 | spin_unlock(&dq_data_lock); | |
1518 | /* Dirtify all the dquots - this can block when journalling */ | |
1519 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1520 | if (inode->i_dquot[cnt]) | |
1521 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1522 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1523 | out: | |
1524 | return ret; | |
1525 | } | |
1526 | EXPORT_SYMBOL(dquot_claim_space); | |
1527 | ||
1528 | /* | |
1529 | * Release reserved quota space | |
1530 | */ | |
1531 | void dquot_release_reserved_space(struct inode *inode, qsize_t number) | |
1532 | { | |
1533 | int cnt; | |
1534 | ||
1535 | if (IS_NOQUOTA(inode)) | |
1536 | goto out; | |
1537 | ||
1538 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1539 | if (IS_NOQUOTA(inode)) | |
1540 | goto out_unlock; | |
1541 | ||
1542 | spin_lock(&dq_data_lock); | |
1543 | /* Release reserved dquots */ | |
1544 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1545 | if (inode->i_dquot[cnt]) |
740d9dcd MC |
1546 | dquot_free_reserved_space(inode->i_dquot[cnt], number); |
1547 | } | |
1548 | spin_unlock(&dq_data_lock); | |
1549 | ||
1550 | out_unlock: | |
1551 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1552 | out: | |
1553 | return; | |
1554 | } | |
1555 | EXPORT_SYMBOL(dquot_release_reserved_space); | |
1556 | ||
1da177e4 LT |
1557 | /* |
1558 | * This operation can block, but only after everything is updated | |
1559 | */ | |
1560 | int dquot_free_space(struct inode *inode, qsize_t number) | |
1561 | { | |
1562 | unsigned int cnt; | |
657d3bfa | 1563 | char warntype[MAXQUOTAS]; |
1da177e4 | 1564 | |
d3be915f IM |
1565 | /* First test before acquiring mutex - solves deadlocks when we |
1566 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1567 | if (IS_NOQUOTA(inode)) { |
1568 | out_sub: | |
1569 | inode_sub_bytes(inode, number); | |
1570 | return QUOTA_OK; | |
1571 | } | |
657d3bfa | 1572 | |
1da177e4 LT |
1573 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1574 | /* Now recheck reliably when holding dqptr_sem */ | |
1575 | if (IS_NOQUOTA(inode)) { | |
1576 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1577 | goto out_sub; | |
1578 | } | |
1579 | spin_lock(&dq_data_lock); | |
1580 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1581 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1582 | continue; |
657d3bfa | 1583 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1584 | dquot_decr_space(inode->i_dquot[cnt], number); |
1585 | } | |
1586 | inode_sub_bytes(inode, number); | |
1587 | spin_unlock(&dq_data_lock); | |
1588 | /* Dirtify all the dquots - this can block when journalling */ | |
1589 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1590 | if (inode->i_dquot[cnt]) | |
1591 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
657d3bfa | 1592 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1593 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1594 | return QUOTA_OK; | |
1595 | } | |
08d0350c | 1596 | EXPORT_SYMBOL(dquot_free_space); |
1da177e4 LT |
1597 | |
1598 | /* | |
1599 | * This operation can block, but only after everything is updated | |
1600 | */ | |
12095460 | 1601 | int dquot_free_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1602 | { |
1603 | unsigned int cnt; | |
657d3bfa | 1604 | char warntype[MAXQUOTAS]; |
1da177e4 | 1605 | |
d3be915f IM |
1606 | /* First test before acquiring mutex - solves deadlocks when we |
1607 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1608 | if (IS_NOQUOTA(inode)) |
1609 | return QUOTA_OK; | |
657d3bfa | 1610 | |
1da177e4 LT |
1611 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1612 | /* Now recheck reliably when holding dqptr_sem */ | |
1613 | if (IS_NOQUOTA(inode)) { | |
1614 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1615 | return QUOTA_OK; | |
1616 | } | |
1617 | spin_lock(&dq_data_lock); | |
1618 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1619 | if (!inode->i_dquot[cnt]) |
1da177e4 | 1620 | continue; |
657d3bfa | 1621 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1622 | dquot_decr_inodes(inode->i_dquot[cnt], number); |
1623 | } | |
1624 | spin_unlock(&dq_data_lock); | |
1625 | /* Dirtify all the dquots - this can block when journalling */ | |
1626 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1627 | if (inode->i_dquot[cnt]) | |
1628 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
657d3bfa | 1629 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1630 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1631 | return QUOTA_OK; | |
1632 | } | |
08d0350c | 1633 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 | 1634 | |
740d9dcd MC |
1635 | /* |
1636 | * call back function, get reserved quota space from underlying fs | |
1637 | */ | |
1638 | qsize_t dquot_get_reserved_space(struct inode *inode) | |
1639 | { | |
1640 | qsize_t reserved_space = 0; | |
1641 | ||
1642 | if (sb_any_quota_active(inode->i_sb) && | |
1643 | inode->i_sb->dq_op->get_reserved_space) | |
1644 | reserved_space = inode->i_sb->dq_op->get_reserved_space(inode); | |
1645 | return reserved_space; | |
1646 | } | |
1647 | ||
1da177e4 LT |
1648 | /* |
1649 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1650 | * | |
1651 | * This operation can block, but only after everything is updated | |
1652 | * A transaction must be started when entering this function. | |
1653 | */ | |
1654 | int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
1655 | { | |
740d9dcd MC |
1656 | qsize_t space, cur_space; |
1657 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1658 | struct dquot *transfer_from[MAXQUOTAS]; |
1659 | struct dquot *transfer_to[MAXQUOTAS]; | |
cc33412f JK |
1660 | int cnt, ret = QUOTA_OK; |
1661 | int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, | |
1662 | chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; | |
657d3bfa JK |
1663 | char warntype_to[MAXQUOTAS]; |
1664 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1665 | |
d3be915f IM |
1666 | /* First test before acquiring mutex - solves deadlocks when we |
1667 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1668 | if (IS_NOQUOTA(inode)) |
1669 | return QUOTA_OK; | |
cc33412f | 1670 | /* Initialize the arrays */ |
1da177e4 | 1671 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
dd6f3c6d JK |
1672 | transfer_from[cnt] = NULL; |
1673 | transfer_to[cnt] = NULL; | |
657d3bfa | 1674 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1675 | switch (cnt) { |
1676 | case USRQUOTA: | |
1677 | if (!chuid) | |
1678 | continue; | |
1679 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt); | |
1680 | break; | |
1681 | case GRPQUOTA: | |
1682 | if (!chgid) | |
1683 | continue; | |
1684 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt); | |
1685 | break; | |
1686 | } | |
1687 | } | |
cc33412f JK |
1688 | |
1689 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1690 | /* Now recheck reliably when holding dqptr_sem */ | |
1691 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ | |
1692 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1693 | goto put_all; | |
1694 | } | |
1da177e4 | 1695 | spin_lock(&dq_data_lock); |
740d9dcd MC |
1696 | cur_space = inode_get_bytes(inode); |
1697 | rsv_space = dquot_get_reserved_space(inode); | |
1698 | space = cur_space + rsv_space; | |
1da177e4 LT |
1699 | /* Build the transfer_from list and check the limits */ |
1700 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
dd6f3c6d | 1701 | if (!transfer_to[cnt]) |
1da177e4 LT |
1702 | continue; |
1703 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
657d3bfa JK |
1704 | if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == |
1705 | NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, | |
1706 | warntype_to + cnt) == NO_QUOTA) | |
cc33412f | 1707 | goto over_quota; |
1da177e4 LT |
1708 | } |
1709 | ||
1710 | /* | |
1711 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1712 | */ | |
1713 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1714 | /* | |
1715 | * Skip changes for same uid or gid or for turned off quota-type. | |
1716 | */ | |
dd6f3c6d | 1717 | if (!transfer_to[cnt]) |
1da177e4 LT |
1718 | continue; |
1719 | ||
1720 | /* Due to IO error we might not have transfer_from[] structure */ | |
1721 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1722 | warntype_from_inodes[cnt] = |
1723 | info_idq_free(transfer_from[cnt], 1); | |
1724 | warntype_from_space[cnt] = | |
1725 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1726 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1727 | dquot_decr_space(transfer_from[cnt], cur_space); |
1728 | dquot_free_reserved_space(transfer_from[cnt], | |
1729 | rsv_space); | |
1da177e4 LT |
1730 | } |
1731 | ||
1732 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1733 | dquot_incr_space(transfer_to[cnt], cur_space); |
1734 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1735 | |
1736 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1737 | } | |
1da177e4 | 1738 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1739 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1740 | ||
1da177e4 LT |
1741 | /* Dirtify all the dquots - this can block when journalling */ |
1742 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1743 | if (transfer_from[cnt]) | |
1744 | mark_dquot_dirty(transfer_from[cnt]); | |
cc33412f | 1745 | if (transfer_to[cnt]) { |
1da177e4 | 1746 | mark_dquot_dirty(transfer_to[cnt]); |
cc33412f | 1747 | /* The reference we got is transferred to the inode */ |
dd6f3c6d | 1748 | transfer_to[cnt] = NULL; |
cc33412f | 1749 | } |
1da177e4 | 1750 | } |
cc33412f | 1751 | warn_put_all: |
657d3bfa JK |
1752 | flush_warnings(transfer_to, warntype_to); |
1753 | flush_warnings(transfer_from, warntype_from_inodes); | |
1754 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1755 | put_all: |
1da177e4 | 1756 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1757 | dqput(transfer_from[cnt]); |
1758 | dqput(transfer_to[cnt]); | |
1da177e4 | 1759 | } |
1da177e4 | 1760 | return ret; |
cc33412f JK |
1761 | over_quota: |
1762 | spin_unlock(&dq_data_lock); | |
1763 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1764 | /* Clear dquot pointers we don't want to dqput() */ | |
1765 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
dd6f3c6d | 1766 | transfer_from[cnt] = NULL; |
cc33412f JK |
1767 | ret = NO_QUOTA; |
1768 | goto warn_put_all; | |
1da177e4 | 1769 | } |
08d0350c | 1770 | EXPORT_SYMBOL(dquot_transfer); |
1da177e4 | 1771 | |
b85f4b87 JK |
1772 | /* Wrapper for transferring ownership of an inode */ |
1773 | int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) | |
1774 | { | |
f55abc0f | 1775 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
b85f4b87 JK |
1776 | vfs_dq_init(inode); |
1777 | if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) | |
1778 | return 1; | |
1779 | } | |
1780 | return 0; | |
1781 | } | |
08d0350c | 1782 | EXPORT_SYMBOL(vfs_dq_transfer); |
b85f4b87 | 1783 | |
1da177e4 LT |
1784 | /* |
1785 | * Write info of quota file to disk | |
1786 | */ | |
1787 | int dquot_commit_info(struct super_block *sb, int type) | |
1788 | { | |
1789 | int ret; | |
1790 | struct quota_info *dqopt = sb_dqopt(sb); | |
1791 | ||
d3be915f | 1792 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1793 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1794 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1795 | return ret; |
1796 | } | |
08d0350c | 1797 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1798 | |
1799 | /* | |
1800 | * Definitions of diskquota operations. | |
1801 | */ | |
1802 | struct dquot_operations dquot_operations = { | |
1803 | .initialize = dquot_initialize, | |
1804 | .drop = dquot_drop, | |
1805 | .alloc_space = dquot_alloc_space, | |
1806 | .alloc_inode = dquot_alloc_inode, | |
1807 | .free_space = dquot_free_space, | |
1808 | .free_inode = dquot_free_inode, | |
1809 | .transfer = dquot_transfer, | |
1810 | .write_dquot = dquot_commit, | |
1811 | .acquire_dquot = dquot_acquire, | |
1812 | .release_dquot = dquot_release, | |
1813 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1814 | .write_info = dquot_commit_info, |
1815 | .alloc_dquot = dquot_alloc, | |
1816 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1817 | }; |
1818 | ||
1da177e4 LT |
1819 | /* |
1820 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1821 | */ | |
f55abc0f | 1822 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1823 | { |
0ff5af83 | 1824 | int cnt, ret = 0; |
1da177e4 LT |
1825 | struct quota_info *dqopt = sb_dqopt(sb); |
1826 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1827 | |
f55abc0f JK |
1828 | /* Cannot turn off usage accounting without turning off limits, or |
1829 | * suspend quotas and simultaneously turn quotas off. */ | |
1830 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1831 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1832 | DQUOT_USAGE_ENABLED))) | |
1833 | return -EINVAL; | |
1834 | ||
1da177e4 | 1835 | /* We need to serialize quota_off() for device */ |
d3be915f | 1836 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1837 | |
1838 | /* | |
1839 | * Skip everything if there's nothing to do. We have to do this because | |
1840 | * sometimes we are called when fill_super() failed and calling | |
1841 | * sync_fs() in such cases does no good. | |
1842 | */ | |
f55abc0f | 1843 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1844 | mutex_unlock(&dqopt->dqonoff_mutex); |
1845 | return 0; | |
1846 | } | |
1da177e4 LT |
1847 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1848 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1849 | if (type != -1 && cnt != type) |
1850 | continue; | |
f55abc0f | 1851 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1852 | continue; |
f55abc0f JK |
1853 | |
1854 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1855 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1856 | dqopt->flags |= |
1857 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1858 | spin_unlock(&dq_state_lock); |
f55abc0f | 1859 | } else { |
cc33412f | 1860 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1861 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1862 | /* Turning off suspended quotas? */ | |
1863 | if (!sb_has_quota_loaded(sb, cnt) && | |
1864 | sb_has_quota_suspended(sb, cnt)) { | |
1865 | dqopt->flags &= ~dquot_state_flag( | |
1866 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1867 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1868 | iput(dqopt->files[cnt]); |
1869 | dqopt->files[cnt] = NULL; | |
1870 | continue; | |
1871 | } | |
cc33412f | 1872 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1873 | } |
f55abc0f JK |
1874 | |
1875 | /* We still have to keep quota loaded? */ | |
1876 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1877 | continue; |
1da177e4 LT |
1878 | |
1879 | /* Note: these are blocking operations */ | |
1880 | drop_dquot_ref(sb, cnt); | |
1881 | invalidate_dquots(sb, cnt); | |
1882 | /* | |
1883 | * Now all dquots should be invalidated, all writes done so we should be only | |
1884 | * users of the info. No locks needed. | |
1885 | */ | |
1886 | if (info_dirty(&dqopt->info[cnt])) | |
1887 | sb->dq_op->write_info(sb, cnt); | |
1888 | if (dqopt->ops[cnt]->free_file_info) | |
1889 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1890 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1891 | ||
1892 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1893 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1894 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1895 | dqopt->info[cnt].dqi_flags = 0; |
1896 | dqopt->info[cnt].dqi_igrace = 0; | |
1897 | dqopt->info[cnt].dqi_bgrace = 0; | |
1898 | dqopt->ops[cnt] = NULL; | |
1899 | } | |
d3be915f | 1900 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1901 | |
1902 | /* Skip syncing and setting flags if quota files are hidden */ | |
1903 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1904 | goto put_inodes; | |
1905 | ||
1da177e4 | 1906 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1907 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1908 | if (sb->s_op->sync_fs) |
1909 | sb->s_op->sync_fs(sb, 1); | |
1910 | sync_blockdev(sb->s_bdev); | |
1911 | /* Now the quota files are just ordinary files and we can set the | |
1912 | * inode flags back. Moreover we discard the pagecache so that | |
1913 | * userspace sees the writes we did bypassing the pagecache. We | |
1914 | * must also discard the blockdev buffers so that we see the | |
1915 | * changes done by userspace on the next quotaon() */ | |
1916 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1917 | if (toputinode[cnt]) { | |
d3be915f | 1918 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1919 | /* If quota was reenabled in the meantime, we have |
1920 | * nothing to do */ | |
f55abc0f | 1921 | if (!sb_has_quota_loaded(sb, cnt)) { |
7925409e | 1922 | mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1923 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1924 | S_NOATIME | S_NOQUOTA); | |
1925 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); | |
1b1dcc1b | 1926 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1927 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1928 | } |
d3be915f | 1929 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1930 | } |
1931 | if (sb->s_bdev) | |
1932 | invalidate_bdev(sb->s_bdev); | |
1933 | put_inodes: | |
1934 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1935 | if (toputinode[cnt]) { | |
0ff5af83 | 1936 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1937 | * can reenable quota on the subsequent remount RW. We |
1938 | * have to check 'flags' variable and not use sb_has_ | |
1939 | * function because another quotaon / quotaoff could | |
1940 | * change global state before we got here. We refuse | |
1941 | * to suspend quotas when there is pending delete on | |
1942 | * the quota file... */ | |
1943 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1944 | iput(toputinode[cnt]); |
1945 | else if (!toputinode[cnt]->i_nlink) | |
1946 | ret = -EBUSY; | |
1da177e4 | 1947 | } |
0ff5af83 | 1948 | return ret; |
1da177e4 | 1949 | } |
08d0350c | 1950 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 1951 | |
f55abc0f JK |
1952 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1953 | { | |
1954 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1955 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1956 | } | |
08d0350c | 1957 | EXPORT_SYMBOL(vfs_quota_off); |
1da177e4 LT |
1958 | /* |
1959 | * Turn quotas on on a device | |
1960 | */ | |
1961 | ||
f55abc0f JK |
1962 | /* |
1963 | * Helper function to turn quotas on when we already have the inode of | |
1964 | * quota file and no quota information is loaded. | |
1965 | */ | |
1966 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1967 | unsigned int flags) | |
1da177e4 LT |
1968 | { |
1969 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1970 | struct super_block *sb = inode->i_sb; | |
1971 | struct quota_info *dqopt = sb_dqopt(sb); | |
1972 | int error; | |
1973 | int oldflags = -1; | |
1974 | ||
1975 | if (!fmt) | |
1976 | return -ESRCH; | |
1977 | if (!S_ISREG(inode->i_mode)) { | |
1978 | error = -EACCES; | |
1979 | goto out_fmt; | |
1980 | } | |
1981 | if (IS_RDONLY(inode)) { | |
1982 | error = -EROFS; | |
1983 | goto out_fmt; | |
1984 | } | |
1985 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
1986 | error = -EINVAL; | |
1987 | goto out_fmt; | |
1988 | } | |
f55abc0f JK |
1989 | /* Usage always has to be set... */ |
1990 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
1991 | error = -EINVAL; | |
1992 | goto out_fmt; | |
1993 | } | |
1da177e4 | 1994 | |
ca785ec6 JK |
1995 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
1996 | /* As we bypass the pagecache we must now flush the inode so | |
1997 | * that we see all the changes from userspace... */ | |
1998 | write_inode_now(inode, 1); | |
1999 | /* And now flush the block cache so that kernel sees the | |
2000 | * changes */ | |
2001 | invalidate_bdev(sb->s_bdev); | |
2002 | } | |
1b1dcc1b | 2003 | mutex_lock(&inode->i_mutex); |
d3be915f | 2004 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2005 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2006 | error = -EBUSY; |
2007 | goto out_lock; | |
2008 | } | |
ca785ec6 JK |
2009 | |
2010 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2011 | /* We don't want quota and atime on quota files (deadlocks | |
2012 | * possible) Also nobody should write to the file - we use | |
2013 | * special IO operations which ignore the immutable bit. */ | |
2014 | down_write(&dqopt->dqptr_sem); | |
2015 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA); | |
2016 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; | |
2017 | up_write(&dqopt->dqptr_sem); | |
2018 | sb->dq_op->drop(inode); | |
2019 | } | |
1da177e4 LT |
2020 | |
2021 | error = -EIO; | |
2022 | dqopt->files[type] = igrab(inode); | |
2023 | if (!dqopt->files[type]) | |
2024 | goto out_lock; | |
2025 | error = -EINVAL; | |
2026 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2027 | goto out_file_init; | |
2028 | ||
2029 | dqopt->ops[type] = fmt->qf_ops; | |
2030 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2031 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2032 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2033 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 2034 | if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) { |
d3be915f | 2035 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2036 | goto out_file_init; |
2037 | } | |
d3be915f | 2038 | mutex_unlock(&dqopt->dqio_mutex); |
1b1dcc1b | 2039 | mutex_unlock(&inode->i_mutex); |
cc33412f | 2040 | spin_lock(&dq_state_lock); |
f55abc0f | 2041 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2042 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2043 | |
2044 | add_dquot_ref(sb, type); | |
d3be915f | 2045 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2046 | |
2047 | return 0; | |
2048 | ||
2049 | out_file_init: | |
2050 | dqopt->files[type] = NULL; | |
2051 | iput(inode); | |
2052 | out_lock: | |
d3be915f | 2053 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2054 | if (oldflags != -1) { |
2055 | down_write(&dqopt->dqptr_sem); | |
2056 | /* Set the flags back (in the case of accidental quotaon() | |
2057 | * on a wrong file we don't want to mess up the flags) */ | |
2058 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2059 | inode->i_flags |= oldflags; | |
2060 | up_write(&dqopt->dqptr_sem); | |
2061 | } | |
1b1dcc1b | 2062 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2063 | out_fmt: |
2064 | put_quota_format(fmt); | |
2065 | ||
2066 | return error; | |
2067 | } | |
2068 | ||
0ff5af83 JK |
2069 | /* Reenable quotas on remount RW */ |
2070 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2071 | { | |
2072 | struct quota_info *dqopt = sb_dqopt(sb); | |
2073 | struct inode *inode; | |
2074 | int ret; | |
f55abc0f | 2075 | unsigned int flags; |
0ff5af83 JK |
2076 | |
2077 | mutex_lock(&dqopt->dqonoff_mutex); | |
2078 | if (!sb_has_quota_suspended(sb, type)) { | |
2079 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2080 | return 0; | |
2081 | } | |
0ff5af83 JK |
2082 | inode = dqopt->files[type]; |
2083 | dqopt->files[type] = NULL; | |
cc33412f | 2084 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2085 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2086 | DQUOT_LIMITS_ENABLED, type); | |
2087 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2088 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2089 | mutex_unlock(&dqopt->dqonoff_mutex); |
2090 | ||
f55abc0f JK |
2091 | flags = dquot_generic_flag(flags, type); |
2092 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2093 | flags); | |
0ff5af83 JK |
2094 | iput(inode); |
2095 | ||
2096 | return ret; | |
2097 | } | |
2098 | ||
77e69dac AV |
2099 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2100 | struct path *path) | |
2101 | { | |
2102 | int error = security_quota_on(path->dentry); | |
2103 | if (error) | |
2104 | return error; | |
2105 | /* Quota file not on the same filesystem? */ | |
2106 | if (path->mnt->mnt_sb != sb) | |
2107 | error = -EXDEV; | |
2108 | else | |
f55abc0f JK |
2109 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2110 | format_id, DQUOT_USAGE_ENABLED | | |
2111 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2112 | return error; |
2113 | } | |
08d0350c | 2114 | EXPORT_SYMBOL(vfs_quota_on_path); |
77e69dac | 2115 | |
8264613d | 2116 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2117 | int remount) |
1da177e4 | 2118 | { |
8264613d | 2119 | struct path path; |
1da177e4 LT |
2120 | int error; |
2121 | ||
0ff5af83 JK |
2122 | if (remount) |
2123 | return vfs_quota_on_remount(sb, type); | |
2124 | ||
8264613d | 2125 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2126 | if (!error) { |
8264613d AV |
2127 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2128 | path_put(&path); | |
77e69dac | 2129 | } |
1da177e4 LT |
2130 | return error; |
2131 | } | |
08d0350c | 2132 | EXPORT_SYMBOL(vfs_quota_on); |
1da177e4 | 2133 | |
f55abc0f JK |
2134 | /* |
2135 | * More powerful function for turning on quotas allowing setting | |
2136 | * of individual quota flags | |
2137 | */ | |
2138 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2139 | unsigned int flags) | |
2140 | { | |
2141 | int ret = 0; | |
2142 | struct super_block *sb = inode->i_sb; | |
2143 | struct quota_info *dqopt = sb_dqopt(sb); | |
2144 | ||
2145 | /* Just unsuspend quotas? */ | |
2146 | if (flags & DQUOT_SUSPENDED) | |
2147 | return vfs_quota_on_remount(sb, type); | |
2148 | if (!flags) | |
2149 | return 0; | |
2150 | /* Just updating flags needed? */ | |
2151 | if (sb_has_quota_loaded(sb, type)) { | |
2152 | mutex_lock(&dqopt->dqonoff_mutex); | |
2153 | /* Now do a reliable test... */ | |
2154 | if (!sb_has_quota_loaded(sb, type)) { | |
2155 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2156 | goto load_quota; | |
2157 | } | |
2158 | if (flags & DQUOT_USAGE_ENABLED && | |
2159 | sb_has_quota_usage_enabled(sb, type)) { | |
2160 | ret = -EBUSY; | |
2161 | goto out_lock; | |
2162 | } | |
2163 | if (flags & DQUOT_LIMITS_ENABLED && | |
2164 | sb_has_quota_limits_enabled(sb, type)) { | |
2165 | ret = -EBUSY; | |
2166 | goto out_lock; | |
2167 | } | |
cc33412f | 2168 | spin_lock(&dq_state_lock); |
f55abc0f | 2169 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2170 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2171 | out_lock: |
2172 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | load_quota: | |
2177 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2178 | } | |
08d0350c | 2179 | EXPORT_SYMBOL(vfs_quota_enable); |
f55abc0f | 2180 | |
1da177e4 LT |
2181 | /* |
2182 | * This function is used when filesystem needs to initialize quotas | |
2183 | * during mount time. | |
2184 | */ | |
84de856e CH |
2185 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2186 | int format_id, int type) | |
1da177e4 | 2187 | { |
84de856e | 2188 | struct dentry *dentry; |
1da177e4 LT |
2189 | int error; |
2190 | ||
2fa389c5 | 2191 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2192 | if (IS_ERR(dentry)) |
2193 | return PTR_ERR(dentry); | |
2194 | ||
154f484b JK |
2195 | if (!dentry->d_inode) { |
2196 | error = -ENOENT; | |
2197 | goto out; | |
2198 | } | |
2199 | ||
1da177e4 | 2200 | error = security_quota_on(dentry); |
84de856e | 2201 | if (!error) |
f55abc0f JK |
2202 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2203 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2204 | |
154f484b | 2205 | out: |
84de856e CH |
2206 | dput(dentry); |
2207 | return error; | |
1da177e4 | 2208 | } |
08d0350c | 2209 | EXPORT_SYMBOL(vfs_quota_on_mount); |
1da177e4 | 2210 | |
b85f4b87 JK |
2211 | /* Wrapper to turn on quotas when remounting rw */ |
2212 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2213 | { | |
2214 | int cnt; | |
2215 | int ret = 0, err; | |
2216 | ||
2217 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2218 | return -ENOSYS; | |
2219 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2220 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2221 | if (err < 0 && !ret) | |
2222 | ret = err; | |
2223 | } | |
2224 | return ret; | |
2225 | } | |
08d0350c | 2226 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |
b85f4b87 | 2227 | |
12095460 JK |
2228 | static inline qsize_t qbtos(qsize_t blocks) |
2229 | { | |
2230 | return blocks << QIF_DQBLKSIZE_BITS; | |
2231 | } | |
2232 | ||
2233 | static inline qsize_t stoqb(qsize_t space) | |
2234 | { | |
2235 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2236 | } | |
2237 | ||
1da177e4 LT |
2238 | /* Generic routine for getting common part of quota structure */ |
2239 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2240 | { | |
2241 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2242 | ||
2243 | spin_lock(&dq_data_lock); | |
12095460 JK |
2244 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2245 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
f18df228 | 2246 | di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; |
1da177e4 LT |
2247 | di->dqb_ihardlimit = dm->dqb_ihardlimit; |
2248 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2249 | di->dqb_curinodes = dm->dqb_curinodes; | |
2250 | di->dqb_btime = dm->dqb_btime; | |
2251 | di->dqb_itime = dm->dqb_itime; | |
2252 | di->dqb_valid = QIF_ALL; | |
2253 | spin_unlock(&dq_data_lock); | |
2254 | } | |
2255 | ||
2256 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
2257 | { | |
2258 | struct dquot *dquot; | |
2259 | ||
cc33412f | 2260 | dquot = dqget(sb, id, type); |
dd6f3c6d | 2261 | if (!dquot) |
1da177e4 | 2262 | return -ESRCH; |
1da177e4 LT |
2263 | do_get_dqblk(dquot, di); |
2264 | dqput(dquot); | |
cc33412f | 2265 | |
1da177e4 LT |
2266 | return 0; |
2267 | } | |
08d0350c | 2268 | EXPORT_SYMBOL(vfs_get_dqblk); |
1da177e4 LT |
2269 | |
2270 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2271 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2272 | { |
2273 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2274 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2275 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2276 | ||
2277 | if ((di->dqb_valid & QIF_BLIMITS && | |
2278 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2279 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2280 | (di->dqb_valid & QIF_ILIMITS && | |
2281 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2282 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2283 | return -ERANGE; | |
1da177e4 LT |
2284 | |
2285 | spin_lock(&dq_data_lock); | |
2286 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2287 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2288 | check_blim = 1; |
4d59bce4 | 2289 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2290 | } |
2291 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2292 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2293 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2294 | check_blim = 1; |
4d59bce4 | 2295 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2296 | } |
2297 | if (di->dqb_valid & QIF_INODES) { | |
2298 | dm->dqb_curinodes = di->dqb_curinodes; | |
2299 | check_ilim = 1; | |
4d59bce4 | 2300 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2301 | } |
2302 | if (di->dqb_valid & QIF_ILIMITS) { | |
2303 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2304 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2305 | check_ilim = 1; | |
4d59bce4 | 2306 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2307 | } |
4d59bce4 | 2308 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2309 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2310 | check_blim = 1; |
4d59bce4 JK |
2311 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2312 | } | |
2313 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2314 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2315 | check_ilim = 1; |
4d59bce4 JK |
2316 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2317 | } | |
1da177e4 LT |
2318 | |
2319 | if (check_blim) { | |
12095460 | 2320 | if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) { |
1da177e4 LT |
2321 | dm->dqb_btime = 0; |
2322 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
2323 | } | |
2324 | else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2325 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2326 | } |
2327 | if (check_ilim) { | |
2328 | if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
2329 | dm->dqb_itime = 0; | |
2330 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
2331 | } | |
2332 | else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2333 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 LT |
2334 | } |
2335 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit) | |
2336 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2337 | else | |
2338 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2339 | spin_unlock(&dq_data_lock); | |
2340 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2341 | |
2342 | return 0; | |
1da177e4 LT |
2343 | } |
2344 | ||
2345 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
2346 | { | |
2347 | struct dquot *dquot; | |
338bf9af | 2348 | int rc; |
1da177e4 | 2349 | |
f55abc0f JK |
2350 | dquot = dqget(sb, id, type); |
2351 | if (!dquot) { | |
2352 | rc = -ESRCH; | |
2353 | goto out; | |
1da177e4 | 2354 | } |
338bf9af | 2355 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2356 | dqput(dquot); |
f55abc0f | 2357 | out: |
338bf9af | 2358 | return rc; |
1da177e4 | 2359 | } |
08d0350c | 2360 | EXPORT_SYMBOL(vfs_set_dqblk); |
1da177e4 LT |
2361 | |
2362 | /* Generic routine for getting common part of quota file information */ | |
2363 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2364 | { | |
2365 | struct mem_dqinfo *mi; | |
2366 | ||
d3be915f | 2367 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2368 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2369 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2370 | return -ESRCH; |
2371 | } | |
2372 | mi = sb_dqopt(sb)->info + type; | |
2373 | spin_lock(&dq_data_lock); | |
2374 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2375 | ii->dqi_igrace = mi->dqi_igrace; | |
2376 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2377 | ii->dqi_valid = IIF_ALL; | |
2378 | spin_unlock(&dq_data_lock); | |
d3be915f | 2379 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2380 | return 0; |
2381 | } | |
08d0350c | 2382 | EXPORT_SYMBOL(vfs_get_dqinfo); |
1da177e4 LT |
2383 | |
2384 | /* Generic routine for setting common part of quota file information */ | |
2385 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2386 | { | |
2387 | struct mem_dqinfo *mi; | |
f55abc0f | 2388 | int err = 0; |
1da177e4 | 2389 | |
d3be915f | 2390 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2391 | if (!sb_has_quota_active(sb, type)) { |
2392 | err = -ESRCH; | |
2393 | goto out; | |
1da177e4 LT |
2394 | } |
2395 | mi = sb_dqopt(sb)->info + type; | |
2396 | spin_lock(&dq_data_lock); | |
2397 | if (ii->dqi_valid & IIF_BGRACE) | |
2398 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2399 | if (ii->dqi_valid & IIF_IGRACE) | |
2400 | mi->dqi_igrace = ii->dqi_igrace; | |
2401 | if (ii->dqi_valid & IIF_FLAGS) | |
2402 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK); | |
2403 | spin_unlock(&dq_data_lock); | |
2404 | mark_info_dirty(sb, type); | |
2405 | /* Force write to disk */ | |
2406 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2407 | out: |
d3be915f | 2408 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2409 | return err; |
1da177e4 | 2410 | } |
08d0350c | 2411 | EXPORT_SYMBOL(vfs_set_dqinfo); |
1da177e4 LT |
2412 | |
2413 | struct quotactl_ops vfs_quotactl_ops = { | |
2414 | .quota_on = vfs_quota_on, | |
2415 | .quota_off = vfs_quota_off, | |
2416 | .quota_sync = vfs_quota_sync, | |
2417 | .get_info = vfs_get_dqinfo, | |
2418 | .set_info = vfs_set_dqinfo, | |
2419 | .get_dqblk = vfs_get_dqblk, | |
2420 | .set_dqblk = vfs_set_dqblk | |
2421 | }; | |
2422 | ||
2423 | static ctl_table fs_dqstats_table[] = { | |
2424 | { | |
2425 | .ctl_name = FS_DQ_LOOKUPS, | |
2426 | .procname = "lookups", | |
2427 | .data = &dqstats.lookups, | |
2428 | .maxlen = sizeof(int), | |
2429 | .mode = 0444, | |
2430 | .proc_handler = &proc_dointvec, | |
2431 | }, | |
2432 | { | |
2433 | .ctl_name = FS_DQ_DROPS, | |
2434 | .procname = "drops", | |
2435 | .data = &dqstats.drops, | |
2436 | .maxlen = sizeof(int), | |
2437 | .mode = 0444, | |
2438 | .proc_handler = &proc_dointvec, | |
2439 | }, | |
2440 | { | |
2441 | .ctl_name = FS_DQ_READS, | |
2442 | .procname = "reads", | |
2443 | .data = &dqstats.reads, | |
2444 | .maxlen = sizeof(int), | |
2445 | .mode = 0444, | |
2446 | .proc_handler = &proc_dointvec, | |
2447 | }, | |
2448 | { | |
2449 | .ctl_name = FS_DQ_WRITES, | |
2450 | .procname = "writes", | |
2451 | .data = &dqstats.writes, | |
2452 | .maxlen = sizeof(int), | |
2453 | .mode = 0444, | |
2454 | .proc_handler = &proc_dointvec, | |
2455 | }, | |
2456 | { | |
2457 | .ctl_name = FS_DQ_CACHE_HITS, | |
2458 | .procname = "cache_hits", | |
2459 | .data = &dqstats.cache_hits, | |
2460 | .maxlen = sizeof(int), | |
2461 | .mode = 0444, | |
2462 | .proc_handler = &proc_dointvec, | |
2463 | }, | |
2464 | { | |
2465 | .ctl_name = FS_DQ_ALLOCATED, | |
2466 | .procname = "allocated_dquots", | |
2467 | .data = &dqstats.allocated_dquots, | |
2468 | .maxlen = sizeof(int), | |
2469 | .mode = 0444, | |
2470 | .proc_handler = &proc_dointvec, | |
2471 | }, | |
2472 | { | |
2473 | .ctl_name = FS_DQ_FREE, | |
2474 | .procname = "free_dquots", | |
2475 | .data = &dqstats.free_dquots, | |
2476 | .maxlen = sizeof(int), | |
2477 | .mode = 0444, | |
2478 | .proc_handler = &proc_dointvec, | |
2479 | }, | |
2480 | { | |
2481 | .ctl_name = FS_DQ_SYNCS, | |
2482 | .procname = "syncs", | |
2483 | .data = &dqstats.syncs, | |
2484 | .maxlen = sizeof(int), | |
2485 | .mode = 0444, | |
2486 | .proc_handler = &proc_dointvec, | |
2487 | }, | |
8e893469 | 2488 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
2489 | { |
2490 | .ctl_name = FS_DQ_WARNINGS, | |
2491 | .procname = "warnings", | |
2492 | .data = &flag_print_warnings, | |
2493 | .maxlen = sizeof(int), | |
2494 | .mode = 0644, | |
2495 | .proc_handler = &proc_dointvec, | |
2496 | }, | |
8e893469 | 2497 | #endif |
1da177e4 LT |
2498 | { .ctl_name = 0 }, |
2499 | }; | |
2500 | ||
2501 | static ctl_table fs_table[] = { | |
2502 | { | |
2503 | .ctl_name = FS_DQSTATS, | |
2504 | .procname = "quota", | |
2505 | .mode = 0555, | |
2506 | .child = fs_dqstats_table, | |
2507 | }, | |
2508 | { .ctl_name = 0 }, | |
2509 | }; | |
2510 | ||
2511 | static ctl_table sys_table[] = { | |
2512 | { | |
2513 | .ctl_name = CTL_FS, | |
2514 | .procname = "fs", | |
2515 | .mode = 0555, | |
2516 | .child = fs_table, | |
2517 | }, | |
2518 | { .ctl_name = 0 }, | |
2519 | }; | |
2520 | ||
2521 | static int __init dquot_init(void) | |
2522 | { | |
2523 | int i; | |
2524 | unsigned long nr_hash, order; | |
2525 | ||
2526 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2527 | ||
0b4d4147 | 2528 | register_sysctl_table(sys_table); |
1da177e4 | 2529 | |
20c2df83 | 2530 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2531 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2532 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2533 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2534 | NULL); |
1da177e4 LT |
2535 | |
2536 | order = 0; | |
2537 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2538 | if (!dquot_hash) | |
2539 | panic("Cannot create dquot hash table"); | |
2540 | ||
2541 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2542 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2543 | dq_hash_bits = 0; | |
2544 | do { | |
2545 | dq_hash_bits++; | |
2546 | } while (nr_hash >> dq_hash_bits); | |
2547 | dq_hash_bits--; | |
2548 | ||
2549 | nr_hash = 1UL << dq_hash_bits; | |
2550 | dq_hash_mask = nr_hash - 1; | |
2551 | for (i = 0; i < nr_hash; i++) | |
2552 | INIT_HLIST_HEAD(dquot_hash + i); | |
2553 | ||
2554 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2555 | nr_hash, order, (PAGE_SIZE << order)); | |
2556 | ||
8e1f936b | 2557 | register_shrinker(&dqcache_shrinker); |
1da177e4 | 2558 | |
8e893469 JK |
2559 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
2560 | if (genl_register_family("a_genl_family) != 0) | |
2561 | printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n"); | |
2562 | #endif | |
2563 | ||
1da177e4 LT |
2564 | return 0; |
2565 | } | |
2566 | module_init(dquot_init); |