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