Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
74 | #include <linux/kmod.h> | |
75 | #include <linux/namei.h> | |
76 | #include <linux/buffer_head.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
fb58b731 | 79 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
8e893469 JK |
80 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
81 | #include <net/netlink.h> | |
82 | #include <net/genetlink.h> | |
83 | #endif | |
1da177e4 LT |
84 | |
85 | #include <asm/uaccess.h> | |
86 | ||
87 | #define __DQUOT_PARANOIA | |
88 | ||
89 | /* | |
cc33412f JK |
90 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
91 | * and quota formats, dqstats structure containing statistics about the lists | |
92 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and | |
93 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 94 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
95 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
96 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
97 | * about latest values take it as well. | |
1da177e4 | 98 | * |
cc33412f JK |
99 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
100 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
101 | * |
102 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
103 | * the life of the dquot structure and so needn't to be protected by a lock | |
104 | * | |
105 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
106 | * operation is just reading pointers from inode (or not using them at all) the | |
107 | * read lock is enough. If pointers are altered function must hold write lock | |
108 | * (these locking rules also apply for S_NOQUOTA flag in the inode - note that | |
cc33412f | 109 | * for altering the flag i_mutex is also needed). |
1da177e4 | 110 | * |
d3be915f | 111 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
112 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
113 | * Currently dquot is locked only when it is being read to memory (or space for | |
114 | * it is being allocated) on the first dqget() and when it is being released on | |
115 | * the last dqput(). The allocation and release oparations are serialized by | |
116 | * the dq_lock and by checking the use count in dquot_release(). Write | |
117 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
118 | * spinlock to internal buffers before writing. | |
119 | * | |
120 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
121 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
122 | * dqio_mutex | |
cc33412f JK |
123 | * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > |
124 | * dqptr_sem. But filesystem has to count with the fact that functions such as | |
125 | * dquot_alloc_space() acquire dqptr_sem and they usually have to be called | |
126 | * from inside a transaction to keep filesystem consistency after a crash. Also | |
127 | * filesystems usually want to do some IO on dquot from ->mark_dirty which is | |
128 | * called with dqptr_sem held. | |
d3be915f | 129 | * i_mutex on quota files is special (it's below dqio_mutex) |
1da177e4 LT |
130 | */ |
131 | ||
132 | static DEFINE_SPINLOCK(dq_list_lock); | |
cc33412f | 133 | static DEFINE_SPINLOCK(dq_state_lock); |
1da177e4 LT |
134 | DEFINE_SPINLOCK(dq_data_lock); |
135 | ||
136 | static char *quotatypes[] = INITQFNAMES; | |
137 | static struct quota_format_type *quota_formats; /* List of registered formats */ | |
138 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
139 | ||
140 | /* SLAB cache for dquot structures */ | |
e18b890b | 141 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
142 | |
143 | int register_quota_format(struct quota_format_type *fmt) | |
144 | { | |
145 | spin_lock(&dq_list_lock); | |
146 | fmt->qf_next = quota_formats; | |
147 | quota_formats = fmt; | |
148 | spin_unlock(&dq_list_lock); | |
149 | return 0; | |
150 | } | |
151 | ||
152 | void unregister_quota_format(struct quota_format_type *fmt) | |
153 | { | |
154 | struct quota_format_type **actqf; | |
155 | ||
156 | spin_lock(&dq_list_lock); | |
157 | for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next); | |
158 | if (*actqf) | |
159 | *actqf = (*actqf)->qf_next; | |
160 | spin_unlock(&dq_list_lock); | |
161 | } | |
162 | ||
163 | static struct quota_format_type *find_quota_format(int id) | |
164 | { | |
165 | struct quota_format_type *actqf; | |
166 | ||
167 | spin_lock(&dq_list_lock); | |
168 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next); | |
169 | if (!actqf || !try_module_get(actqf->qf_owner)) { | |
170 | int qm; | |
171 | ||
172 | spin_unlock(&dq_list_lock); | |
173 | ||
174 | for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++); | |
175 | if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name)) | |
176 | return NULL; | |
177 | ||
178 | spin_lock(&dq_list_lock); | |
179 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next); | |
180 | if (actqf && !try_module_get(actqf->qf_owner)) | |
181 | actqf = NULL; | |
182 | } | |
183 | spin_unlock(&dq_list_lock); | |
184 | return actqf; | |
185 | } | |
186 | ||
187 | static void put_quota_format(struct quota_format_type *fmt) | |
188 | { | |
189 | module_put(fmt->qf_owner); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Dquot List Management: | |
194 | * The quota code uses three lists for dquot management: the inuse_list, | |
195 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
196 | * on all three lists, depending on its current state. | |
197 | * | |
198 | * All dquots are placed to the end of inuse_list when first created, and this | |
199 | * list is used for invalidate operation, which must look at every dquot. | |
200 | * | |
201 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
202 | * and this list is searched whenever we need an available dquot. Dquots are | |
203 | * removed from the list as soon as they are used again, and | |
204 | * dqstats.free_dquots gives the number of dquots on the list. When | |
205 | * dquot is invalidated it's completely released from memory. | |
206 | * | |
207 | * Dquots with a specific identity (device, type and id) are placed on | |
208 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
209 | * mechanism to locate a specific dquot. | |
210 | */ | |
211 | ||
212 | static LIST_HEAD(inuse_list); | |
213 | static LIST_HEAD(free_dquots); | |
214 | static unsigned int dq_hash_bits, dq_hash_mask; | |
215 | static struct hlist_head *dquot_hash; | |
216 | ||
217 | struct dqstats dqstats; | |
218 | ||
1da177e4 LT |
219 | static inline unsigned int |
220 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
221 | { | |
222 | unsigned long tmp; | |
223 | ||
224 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
225 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Following list functions expect dq_list_lock to be held | |
230 | */ | |
231 | static inline void insert_dquot_hash(struct dquot *dquot) | |
232 | { | |
233 | struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
234 | hlist_add_head(&dquot->dq_hash, head); | |
235 | } | |
236 | ||
237 | static inline void remove_dquot_hash(struct dquot *dquot) | |
238 | { | |
239 | hlist_del_init(&dquot->dq_hash); | |
240 | } | |
241 | ||
242 | static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type) | |
243 | { | |
244 | struct hlist_node *node; | |
245 | struct dquot *dquot; | |
246 | ||
247 | hlist_for_each (node, dquot_hash+hashent) { | |
248 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
249 | if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type) | |
250 | return dquot; | |
251 | } | |
252 | return NODQUOT; | |
253 | } | |
254 | ||
255 | /* Add a dquot to the tail of the free list */ | |
256 | static inline void put_dquot_last(struct dquot *dquot) | |
257 | { | |
8e13059a | 258 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
259 | dqstats.free_dquots++; |
260 | } | |
261 | ||
262 | static inline void remove_free_dquot(struct dquot *dquot) | |
263 | { | |
264 | if (list_empty(&dquot->dq_free)) | |
265 | return; | |
266 | list_del_init(&dquot->dq_free); | |
267 | dqstats.free_dquots--; | |
268 | } | |
269 | ||
270 | static inline void put_inuse(struct dquot *dquot) | |
271 | { | |
272 | /* We add to the back of inuse list so we don't have to restart | |
273 | * when traversing this list and we block */ | |
8e13059a | 274 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
275 | dqstats.allocated_dquots++; |
276 | } | |
277 | ||
278 | static inline void remove_inuse(struct dquot *dquot) | |
279 | { | |
280 | dqstats.allocated_dquots--; | |
281 | list_del(&dquot->dq_inuse); | |
282 | } | |
283 | /* | |
284 | * End of list functions needing dq_list_lock | |
285 | */ | |
286 | ||
287 | static void wait_on_dquot(struct dquot *dquot) | |
288 | { | |
d3be915f IM |
289 | mutex_lock(&dquot->dq_lock); |
290 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
291 | } |
292 | ||
03f6e92b JK |
293 | static inline int dquot_dirty(struct dquot *dquot) |
294 | { | |
295 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
296 | } | |
297 | ||
298 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
299 | { | |
300 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
301 | } | |
1da177e4 LT |
302 | |
303 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
304 | { | |
305 | spin_lock(&dq_list_lock); | |
306 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
307 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
308 | info[dquot->dq_type].dqi_dirty_list); | |
309 | spin_unlock(&dq_list_lock); | |
310 | return 0; | |
311 | } | |
312 | ||
313 | /* This function needs dq_list_lock */ | |
314 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
315 | { | |
316 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
317 | return 0; | |
318 | list_del_init(&dquot->dq_dirty); | |
319 | return 1; | |
320 | } | |
321 | ||
322 | void mark_info_dirty(struct super_block *sb, int type) | |
323 | { | |
324 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
325 | } | |
326 | EXPORT_SYMBOL(mark_info_dirty); | |
327 | ||
328 | /* | |
329 | * Read dquot from disk and alloc space for it | |
330 | */ | |
331 | ||
332 | int dquot_acquire(struct dquot *dquot) | |
333 | { | |
334 | int ret = 0, ret2 = 0; | |
335 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
336 | ||
d3be915f IM |
337 | mutex_lock(&dquot->dq_lock); |
338 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
339 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
340 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
341 | if (ret < 0) | |
342 | goto out_iolock; | |
343 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
344 | /* Instantiate dquot if needed */ | |
345 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
346 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
347 | /* Write the info if needed */ | |
348 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
349 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
350 | if (ret < 0) | |
351 | goto out_iolock; | |
352 | if (ret2 < 0) { | |
353 | ret = ret2; | |
354 | goto out_iolock; | |
355 | } | |
356 | } | |
357 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
358 | out_iolock: | |
d3be915f IM |
359 | mutex_unlock(&dqopt->dqio_mutex); |
360 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
361 | return ret; |
362 | } | |
363 | ||
364 | /* | |
365 | * Write dquot to disk | |
366 | */ | |
367 | int dquot_commit(struct dquot *dquot) | |
368 | { | |
369 | int ret = 0, ret2 = 0; | |
370 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
371 | ||
d3be915f | 372 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
373 | spin_lock(&dq_list_lock); |
374 | if (!clear_dquot_dirty(dquot)) { | |
375 | spin_unlock(&dq_list_lock); | |
376 | goto out_sem; | |
377 | } | |
378 | spin_unlock(&dq_list_lock); | |
379 | /* Inactive dquot can be only if there was error during read/init | |
380 | * => we have better not writing it */ | |
381 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
382 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
383 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
384 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
385 | if (ret >= 0) | |
386 | ret = ret2; | |
387 | } | |
388 | out_sem: | |
d3be915f | 389 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
390 | return ret; |
391 | } | |
392 | ||
393 | /* | |
394 | * Release dquot | |
395 | */ | |
396 | int dquot_release(struct dquot *dquot) | |
397 | { | |
398 | int ret = 0, ret2 = 0; | |
399 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
400 | ||
d3be915f | 401 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
402 | /* Check whether we are not racing with some other dqget() */ |
403 | if (atomic_read(&dquot->dq_count) > 1) | |
404 | goto out_dqlock; | |
d3be915f | 405 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
406 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
407 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
408 | /* Write the info */ | |
409 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
410 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
411 | if (ret >= 0) | |
412 | ret = ret2; | |
413 | } | |
414 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 415 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 416 | out_dqlock: |
d3be915f | 417 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
418 | return ret; |
419 | } | |
420 | ||
7d9056ba | 421 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
422 | { |
423 | kmem_cache_free(dquot_cachep, dquot); | |
424 | } | |
7d9056ba | 425 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
426 | |
427 | static inline void do_destroy_dquot(struct dquot *dquot) | |
428 | { | |
429 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /* Invalidate all dquots on the list. Note that this function is called after |
433 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
434 | * quota users. There can still be some users of quotas due to inodes being |
435 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 436 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 437 | */ |
1da177e4 LT |
438 | static void invalidate_dquots(struct super_block *sb, int type) |
439 | { | |
c33ed271 | 440 | struct dquot *dquot, *tmp; |
1da177e4 | 441 | |
6362e4d4 | 442 | restart: |
1da177e4 | 443 | spin_lock(&dq_list_lock); |
c33ed271 | 444 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
445 | if (dquot->dq_sb != sb) |
446 | continue; | |
447 | if (dquot->dq_type != type) | |
448 | continue; | |
6362e4d4 JK |
449 | /* Wait for dquot users */ |
450 | if (atomic_read(&dquot->dq_count)) { | |
451 | DEFINE_WAIT(wait); | |
452 | ||
453 | atomic_inc(&dquot->dq_count); | |
454 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
455 | TASK_UNINTERRUPTIBLE); | |
456 | spin_unlock(&dq_list_lock); | |
457 | /* Once dqput() wakes us up, we know it's time to free | |
458 | * the dquot. | |
459 | * IMPORTANT: we rely on the fact that there is always | |
460 | * at most one process waiting for dquot to free. | |
461 | * Otherwise dq_count would be > 1 and we would never | |
462 | * wake up. | |
463 | */ | |
464 | if (atomic_read(&dquot->dq_count) > 1) | |
465 | schedule(); | |
466 | finish_wait(&dquot->dq_wait_unused, &wait); | |
467 | dqput(dquot); | |
468 | /* At this moment dquot() need not exist (it could be | |
469 | * reclaimed by prune_dqcache(). Hence we must | |
470 | * restart. */ | |
471 | goto restart; | |
472 | } | |
473 | /* | |
474 | * Quota now has no users and it has been written on last | |
475 | * dqput() | |
476 | */ | |
1da177e4 LT |
477 | remove_dquot_hash(dquot); |
478 | remove_free_dquot(dquot); | |
479 | remove_inuse(dquot); | |
74f783af | 480 | do_destroy_dquot(dquot); |
1da177e4 LT |
481 | } |
482 | spin_unlock(&dq_list_lock); | |
483 | } | |
484 | ||
12c77527 JK |
485 | /* Call callback for every active dquot on given filesystem */ |
486 | int dquot_scan_active(struct super_block *sb, | |
487 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
488 | unsigned long priv) | |
489 | { | |
490 | struct dquot *dquot, *old_dquot = NULL; | |
491 | int ret = 0; | |
492 | ||
493 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
494 | spin_lock(&dq_list_lock); | |
495 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
496 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
497 | continue; | |
498 | if (dquot->dq_sb != sb) | |
499 | continue; | |
500 | /* Now we have active dquot so we can just increase use count */ | |
501 | atomic_inc(&dquot->dq_count); | |
502 | dqstats.lookups++; | |
503 | spin_unlock(&dq_list_lock); | |
504 | dqput(old_dquot); | |
505 | old_dquot = dquot; | |
506 | ret = fn(dquot, priv); | |
507 | if (ret < 0) | |
508 | goto out; | |
509 | spin_lock(&dq_list_lock); | |
510 | /* We are safe to continue now because our dquot could not | |
511 | * be moved out of the inuse list while we hold the reference */ | |
512 | } | |
513 | spin_unlock(&dq_list_lock); | |
514 | out: | |
515 | dqput(old_dquot); | |
516 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
517 | return ret; | |
518 | } | |
519 | ||
1da177e4 LT |
520 | int vfs_quota_sync(struct super_block *sb, int type) |
521 | { | |
522 | struct list_head *dirty; | |
523 | struct dquot *dquot; | |
524 | struct quota_info *dqopt = sb_dqopt(sb); | |
525 | int cnt; | |
526 | ||
d3be915f | 527 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
528 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
529 | if (type != -1 && cnt != type) | |
530 | continue; | |
f55abc0f | 531 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
532 | continue; |
533 | spin_lock(&dq_list_lock); | |
534 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
535 | while (!list_empty(dirty)) { | |
b5e61818 | 536 | dquot = list_first_entry(dirty, struct dquot, dq_dirty); |
1da177e4 LT |
537 | /* Dirty and inactive can be only bad dquot... */ |
538 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
539 | clear_dquot_dirty(dquot); | |
540 | continue; | |
541 | } | |
542 | /* Now we have active dquot from which someone is | |
543 | * holding reference so we can safely just increase | |
544 | * use count */ | |
545 | atomic_inc(&dquot->dq_count); | |
546 | dqstats.lookups++; | |
547 | spin_unlock(&dq_list_lock); | |
548 | sb->dq_op->write_dquot(dquot); | |
549 | dqput(dquot); | |
550 | spin_lock(&dq_list_lock); | |
551 | } | |
552 | spin_unlock(&dq_list_lock); | |
553 | } | |
554 | ||
555 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
556 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
557 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 LT |
558 | sb->dq_op->write_info(sb, cnt); |
559 | spin_lock(&dq_list_lock); | |
560 | dqstats.syncs++; | |
561 | spin_unlock(&dq_list_lock); | |
d3be915f | 562 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
563 | |
564 | return 0; | |
565 | } | |
566 | ||
567 | /* Free unused dquots from cache */ | |
568 | static void prune_dqcache(int count) | |
569 | { | |
570 | struct list_head *head; | |
571 | struct dquot *dquot; | |
572 | ||
573 | head = free_dquots.prev; | |
574 | while (head != &free_dquots && count) { | |
575 | dquot = list_entry(head, struct dquot, dq_free); | |
576 | remove_dquot_hash(dquot); | |
577 | remove_free_dquot(dquot); | |
578 | remove_inuse(dquot); | |
74f783af | 579 | do_destroy_dquot(dquot); |
1da177e4 LT |
580 | count--; |
581 | head = free_dquots.prev; | |
582 | } | |
583 | } | |
584 | ||
585 | /* | |
586 | * This is called from kswapd when we think we need some | |
587 | * more memory | |
588 | */ | |
589 | ||
27496a8c | 590 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
591 | { |
592 | if (nr) { | |
593 | spin_lock(&dq_list_lock); | |
594 | prune_dqcache(nr); | |
595 | spin_unlock(&dq_list_lock); | |
596 | } | |
597 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
598 | } | |
599 | ||
8e1f936b RR |
600 | static struct shrinker dqcache_shrinker = { |
601 | .shrink = shrink_dqcache_memory, | |
602 | .seeks = DEFAULT_SEEKS, | |
603 | }; | |
604 | ||
1da177e4 LT |
605 | /* |
606 | * Put reference to dquot | |
607 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
1da177e4 | 608 | */ |
3d9ea253 | 609 | void dqput(struct dquot *dquot) |
1da177e4 | 610 | { |
b48d3805 JK |
611 | int ret; |
612 | ||
1da177e4 LT |
613 | if (!dquot) |
614 | return; | |
615 | #ifdef __DQUOT_PARANOIA | |
616 | if (!atomic_read(&dquot->dq_count)) { | |
617 | printk("VFS: dqput: trying to free free dquot\n"); | |
618 | printk("VFS: device %s, dquot of %s %d\n", | |
619 | dquot->dq_sb->s_id, | |
620 | quotatypes[dquot->dq_type], | |
621 | dquot->dq_id); | |
622 | BUG(); | |
623 | } | |
624 | #endif | |
625 | ||
626 | spin_lock(&dq_list_lock); | |
627 | dqstats.drops++; | |
628 | spin_unlock(&dq_list_lock); | |
629 | we_slept: | |
630 | spin_lock(&dq_list_lock); | |
631 | if (atomic_read(&dquot->dq_count) > 1) { | |
632 | /* We have more than one user... nothing to do */ | |
633 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 634 | /* Releasing dquot during quotaoff phase? */ |
f55abc0f | 635 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && |
6362e4d4 JK |
636 | atomic_read(&dquot->dq_count) == 1) |
637 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
638 | spin_unlock(&dq_list_lock); |
639 | return; | |
640 | } | |
641 | /* Need to release dquot? */ | |
642 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
643 | spin_unlock(&dq_list_lock); | |
644 | /* Commit dquot before releasing */ | |
b48d3805 JK |
645 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
646 | if (ret < 0) { | |
647 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
648 | "device %s (error %d). Quota may get out of " | |
649 | "sync!\n", dquot->dq_sb->s_id, ret); | |
650 | /* | |
651 | * We clear dirty bit anyway, so that we avoid | |
652 | * infinite loop here | |
653 | */ | |
654 | spin_lock(&dq_list_lock); | |
655 | clear_dquot_dirty(dquot); | |
656 | spin_unlock(&dq_list_lock); | |
657 | } | |
1da177e4 LT |
658 | goto we_slept; |
659 | } | |
660 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
661 | clear_dquot_dirty(dquot); | |
662 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
663 | spin_unlock(&dq_list_lock); | |
664 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
665 | goto we_slept; | |
666 | } | |
667 | atomic_dec(&dquot->dq_count); | |
668 | #ifdef __DQUOT_PARANOIA | |
669 | /* sanity check */ | |
8abf6a47 | 670 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
671 | #endif |
672 | put_dquot_last(dquot); | |
673 | spin_unlock(&dq_list_lock); | |
674 | } | |
675 | ||
7d9056ba | 676 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
677 | { |
678 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
679 | } | |
7d9056ba | 680 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 681 | |
1da177e4 LT |
682 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
683 | { | |
684 | struct dquot *dquot; | |
685 | ||
74f783af | 686 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 LT |
687 | if(!dquot) |
688 | return NODQUOT; | |
689 | ||
d3be915f | 690 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
691 | INIT_LIST_HEAD(&dquot->dq_free); |
692 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
693 | INIT_HLIST_NODE(&dquot->dq_hash); | |
694 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 695 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
696 | dquot->dq_sb = sb; |
697 | dquot->dq_type = type; | |
698 | atomic_set(&dquot->dq_count, 1); | |
699 | ||
700 | return dquot; | |
701 | } | |
702 | ||
703 | /* | |
704 | * Get reference to dquot | |
cc33412f JK |
705 | * |
706 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
707 | * destroying our dquot by: | |
708 | * a) checking for quota flags under dq_list_lock and | |
709 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 710 | */ |
3d9ea253 | 711 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
1da177e4 LT |
712 | { |
713 | unsigned int hashent = hashfn(sb, id, type); | |
cc33412f | 714 | struct dquot *dquot = NODQUOT, *empty = NODQUOT; |
1da177e4 | 715 | |
f55abc0f | 716 | if (!sb_has_quota_active(sb, type)) |
1da177e4 LT |
717 | return NODQUOT; |
718 | we_slept: | |
719 | spin_lock(&dq_list_lock); | |
cc33412f JK |
720 | spin_lock(&dq_state_lock); |
721 | if (!sb_has_quota_active(sb, type)) { | |
722 | spin_unlock(&dq_state_lock); | |
723 | spin_unlock(&dq_list_lock); | |
724 | goto out; | |
725 | } | |
726 | spin_unlock(&dq_state_lock); | |
727 | ||
1da177e4 LT |
728 | if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) { |
729 | if (empty == NODQUOT) { | |
730 | spin_unlock(&dq_list_lock); | |
731 | if ((empty = get_empty_dquot(sb, type)) == NODQUOT) | |
732 | schedule(); /* Try to wait for a moment... */ | |
733 | goto we_slept; | |
734 | } | |
735 | dquot = empty; | |
cc33412f | 736 | empty = NODQUOT; |
1da177e4 LT |
737 | dquot->dq_id = id; |
738 | /* all dquots go on the inuse_list */ | |
739 | put_inuse(dquot); | |
740 | /* hash it first so it can be found */ | |
741 | insert_dquot_hash(dquot); | |
742 | dqstats.lookups++; | |
743 | spin_unlock(&dq_list_lock); | |
744 | } else { | |
745 | if (!atomic_read(&dquot->dq_count)) | |
746 | remove_free_dquot(dquot); | |
747 | atomic_inc(&dquot->dq_count); | |
748 | dqstats.cache_hits++; | |
749 | dqstats.lookups++; | |
750 | spin_unlock(&dq_list_lock); | |
1da177e4 LT |
751 | } |
752 | /* Wait for dq_lock - after this we know that either dquot_release() is already | |
753 | * finished or it will be canceled due to dq_count > 1 test */ | |
754 | wait_on_dquot(dquot); | |
755 | /* Read the dquot and instantiate it (everything done only if needed) */ | |
756 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) { | |
757 | dqput(dquot); | |
cc33412f JK |
758 | dquot = NODQUOT; |
759 | goto out; | |
1da177e4 LT |
760 | } |
761 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 762 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 763 | #endif |
cc33412f JK |
764 | out: |
765 | if (empty) | |
766 | do_destroy_dquot(empty); | |
1da177e4 LT |
767 | |
768 | return dquot; | |
769 | } | |
770 | ||
771 | static int dqinit_needed(struct inode *inode, int type) | |
772 | { | |
773 | int cnt; | |
774 | ||
775 | if (IS_NOQUOTA(inode)) | |
776 | return 0; | |
777 | if (type != -1) | |
778 | return inode->i_dquot[type] == NODQUOT; | |
779 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
780 | if (inode->i_dquot[cnt] == NODQUOT) | |
781 | return 1; | |
782 | return 0; | |
783 | } | |
784 | ||
d3be915f | 785 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
786 | static void add_dquot_ref(struct super_block *sb, int type) |
787 | { | |
941d2380 | 788 | struct inode *inode, *old_inode = NULL; |
1da177e4 | 789 | |
d003fb70 CH |
790 | spin_lock(&inode_lock); |
791 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
792 | if (!atomic_read(&inode->i_writecount)) | |
793 | continue; | |
794 | if (!dqinit_needed(inode, type)) | |
795 | continue; | |
796 | if (inode->i_state & (I_FREEING|I_WILL_FREE)) | |
797 | continue; | |
798 | ||
799 | __iget(inode); | |
800 | spin_unlock(&inode_lock); | |
801 | ||
941d2380 | 802 | iput(old_inode); |
d003fb70 | 803 | sb->dq_op->initialize(inode, type); |
941d2380 JK |
804 | /* We hold a reference to 'inode' so it couldn't have been |
805 | * removed from s_inodes list while we dropped the inode_lock. | |
806 | * We cannot iput the inode now as we can be holding the last | |
807 | * reference and we cannot iput it under inode_lock. So we | |
808 | * keep the reference and iput it later. */ | |
809 | old_inode = inode; | |
810 | spin_lock(&inode_lock); | |
1da177e4 | 811 | } |
d003fb70 | 812 | spin_unlock(&inode_lock); |
941d2380 | 813 | iput(old_inode); |
1da177e4 LT |
814 | } |
815 | ||
816 | /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */ | |
817 | static inline int dqput_blocks(struct dquot *dquot) | |
818 | { | |
819 | if (atomic_read(&dquot->dq_count) <= 1) | |
820 | return 1; | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /* Remove references to dquots from inode - add dquot to list for freeing if needed */ | |
825 | /* We can't race with anybody because we hold dqptr_sem for writing... */ | |
e5f00f42 AB |
826 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
827 | struct list_head *tofree_head) | |
1da177e4 LT |
828 | { |
829 | struct dquot *dquot = inode->i_dquot[type]; | |
830 | ||
831 | inode->i_dquot[type] = NODQUOT; | |
832 | if (dquot != NODQUOT) { | |
833 | if (dqput_blocks(dquot)) { | |
834 | #ifdef __DQUOT_PARANOIA | |
835 | if (atomic_read(&dquot->dq_count) != 1) | |
836 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
837 | #endif | |
838 | spin_lock(&dq_list_lock); | |
839 | list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */ | |
840 | spin_unlock(&dq_list_lock); | |
841 | return 1; | |
842 | } | |
843 | else | |
844 | dqput(dquot); /* We have guaranteed we won't block */ | |
845 | } | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /* Free list of dquots - called from inode.c */ | |
850 | /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */ | |
851 | static void put_dquot_list(struct list_head *tofree_head) | |
852 | { | |
853 | struct list_head *act_head; | |
854 | struct dquot *dquot; | |
855 | ||
856 | act_head = tofree_head->next; | |
857 | /* So now we have dquots on the list... Just free them */ | |
858 | while (act_head != tofree_head) { | |
859 | dquot = list_entry(act_head, struct dquot, dq_free); | |
860 | act_head = act_head->next; | |
861 | list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */ | |
862 | dqput(dquot); | |
863 | } | |
864 | } | |
865 | ||
fb58b731 CH |
866 | static void remove_dquot_ref(struct super_block *sb, int type, |
867 | struct list_head *tofree_head) | |
868 | { | |
869 | struct inode *inode; | |
870 | ||
871 | spin_lock(&inode_lock); | |
872 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
873 | if (!IS_NOQUOTA(inode)) | |
874 | remove_inode_dquot_ref(inode, type, tofree_head); | |
875 | } | |
876 | spin_unlock(&inode_lock); | |
877 | } | |
878 | ||
1da177e4 LT |
879 | /* Gather all references from inodes and drop them */ |
880 | static void drop_dquot_ref(struct super_block *sb, int type) | |
881 | { | |
882 | LIST_HEAD(tofree_head); | |
883 | ||
fb58b731 CH |
884 | if (sb->dq_op) { |
885 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
886 | remove_dquot_ref(sb, type, &tofree_head); | |
887 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
888 | put_dquot_list(&tofree_head); | |
889 | } | |
1da177e4 LT |
890 | } |
891 | ||
12095460 | 892 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
893 | { |
894 | dquot->dq_dqb.dqb_curinodes += number; | |
895 | } | |
896 | ||
897 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
898 | { | |
899 | dquot->dq_dqb.dqb_curspace += number; | |
900 | } | |
901 | ||
12095460 | 902 | static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 903 | { |
db49d2df JK |
904 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
905 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
906 | dquot->dq_dqb.dqb_curinodes -= number; |
907 | else | |
908 | dquot->dq_dqb.dqb_curinodes = 0; | |
909 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
910 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
911 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
912 | } | |
913 | ||
914 | static inline void dquot_decr_space(struct dquot *dquot, qsize_t number) | |
915 | { | |
db49d2df JK |
916 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
917 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
918 | dquot->dq_dqb.dqb_curspace -= number; |
919 | else | |
920 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 921 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
922 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
923 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
924 | } | |
925 | ||
c525460e JK |
926 | static int warning_issued(struct dquot *dquot, const int warntype) |
927 | { | |
928 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
929 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
930 | ((warntype == QUOTA_NL_IHARDWARN || | |
931 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
932 | ||
933 | if (!flag) | |
934 | return 0; | |
935 | return test_and_set_bit(flag, &dquot->dq_flags); | |
936 | } | |
937 | ||
8e893469 | 938 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
939 | static int flag_print_warnings = 1; |
940 | ||
941 | static inline int need_print_warning(struct dquot *dquot) | |
942 | { | |
943 | if (!flag_print_warnings) | |
944 | return 0; | |
945 | ||
946 | switch (dquot->dq_type) { | |
947 | case USRQUOTA: | |
da9592ed | 948 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
949 | case GRPQUOTA: |
950 | return in_group_p(dquot->dq_id); | |
951 | } | |
952 | return 0; | |
953 | } | |
954 | ||
1da177e4 | 955 | /* Print warning to user which exceeded quota */ |
c525460e | 956 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
957 | { |
958 | char *msg = NULL; | |
24ec839c | 959 | struct tty_struct *tty; |
1da177e4 | 960 | |
657d3bfa JK |
961 | if (warntype == QUOTA_NL_IHARDBELOW || |
962 | warntype == QUOTA_NL_ISOFTBELOW || | |
963 | warntype == QUOTA_NL_BHARDBELOW || | |
964 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
965 | return; |
966 | ||
24ec839c PZ |
967 | tty = get_current_tty(); |
968 | if (!tty) | |
452a00d2 | 969 | return; |
24ec839c | 970 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 971 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 972 | tty_write_message(tty, ": warning, "); |
1da177e4 | 973 | else |
24ec839c PZ |
974 | tty_write_message(tty, ": write failed, "); |
975 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 976 | switch (warntype) { |
8e893469 | 977 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
978 | msg = " file limit reached.\r\n"; |
979 | break; | |
8e893469 | 980 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
981 | msg = " file quota exceeded too long.\r\n"; |
982 | break; | |
8e893469 | 983 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
984 | msg = " file quota exceeded.\r\n"; |
985 | break; | |
8e893469 | 986 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
987 | msg = " block limit reached.\r\n"; |
988 | break; | |
8e893469 | 989 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
990 | msg = " block quota exceeded too long.\r\n"; |
991 | break; | |
8e893469 | 992 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
993 | msg = " block quota exceeded.\r\n"; |
994 | break; | |
995 | } | |
24ec839c | 996 | tty_write_message(tty, msg); |
452a00d2 | 997 | tty_kref_put(tty); |
1da177e4 | 998 | } |
8e893469 JK |
999 | #endif |
1000 | ||
1001 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1002 | ||
8e893469 JK |
1003 | /* Netlink family structure for quota */ |
1004 | static struct genl_family quota_genl_family = { | |
1005 | .id = GENL_ID_GENERATE, | |
1006 | .hdrsize = 0, | |
1007 | .name = "VFS_DQUOT", | |
1008 | .version = 1, | |
1009 | .maxattr = QUOTA_NL_A_MAX, | |
1010 | }; | |
1011 | ||
1012 | /* Send warning to userspace about user which exceeded quota */ | |
1013 | static void send_warning(const struct dquot *dquot, const char warntype) | |
1014 | { | |
1015 | static atomic_t seq; | |
1016 | struct sk_buff *skb; | |
1017 | void *msg_head; | |
1018 | int ret; | |
22dd4837 JK |
1019 | int msg_size = 4 * nla_total_size(sizeof(u32)) + |
1020 | 2 * nla_total_size(sizeof(u64)); | |
8e893469 JK |
1021 | |
1022 | /* We have to allocate using GFP_NOFS as we are called from a | |
1023 | * filesystem performing write and thus further recursion into | |
1024 | * the fs to free some data could cause deadlocks. */ | |
22dd4837 | 1025 | skb = genlmsg_new(msg_size, GFP_NOFS); |
8e893469 JK |
1026 | if (!skb) { |
1027 | printk(KERN_ERR | |
1028 | "VFS: Not enough memory to send quota warning.\n"); | |
1029 | return; | |
1030 | } | |
1031 | msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), | |
1032 | "a_genl_family, 0, QUOTA_NL_C_WARNING); | |
1033 | if (!msg_head) { | |
1034 | printk(KERN_ERR | |
1035 | "VFS: Cannot store netlink header in quota warning.\n"); | |
1036 | goto err_out; | |
1037 | } | |
1038 | ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type); | |
1039 | if (ret) | |
1040 | goto attr_err_out; | |
1041 | ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id); | |
1042 | if (ret) | |
1043 | goto attr_err_out; | |
1044 | ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); | |
1045 | if (ret) | |
1046 | goto attr_err_out; | |
1047 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, | |
1048 | MAJOR(dquot->dq_sb->s_dev)); | |
1049 | if (ret) | |
1050 | goto attr_err_out; | |
1051 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, | |
1052 | MINOR(dquot->dq_sb->s_dev)); | |
1053 | if (ret) | |
1054 | goto attr_err_out; | |
da9592ed | 1055 | ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid()); |
8e893469 JK |
1056 | if (ret) |
1057 | goto attr_err_out; | |
1058 | genlmsg_end(skb, msg_head); | |
1059 | ||
1060 | ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); | |
1061 | if (ret < 0 && ret != -ESRCH) | |
1062 | printk(KERN_ERR | |
1063 | "VFS: Failed to send notification message: %d\n", ret); | |
1064 | return; | |
1065 | attr_err_out: | |
22dd4837 | 1066 | printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); |
8e893469 JK |
1067 | err_out: |
1068 | kfree_skb(skb); | |
1069 | } | |
1070 | #endif | |
1da177e4 | 1071 | |
087ee8d5 | 1072 | static inline void flush_warnings(struct dquot * const *dquots, char *warntype) |
1da177e4 LT |
1073 | { |
1074 | int i; | |
1075 | ||
1076 | for (i = 0; i < MAXQUOTAS; i++) | |
c525460e JK |
1077 | if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN && |
1078 | !warning_issued(dquots[i], warntype[i])) { | |
8e893469 | 1079 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 1080 | print_warning(dquots[i], warntype[i]); |
8e893469 JK |
1081 | #endif |
1082 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1083 | send_warning(dquots[i], warntype[i]); | |
1084 | #endif | |
1085 | } | |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | static inline char ignore_hardlimit(struct dquot *dquot) | |
1089 | { | |
1090 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1091 | ||
1092 | return capable(CAP_SYS_RESOURCE) && | |
1093 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1094 | } | |
1095 | ||
1096 | /* needs dq_data_lock */ | |
12095460 | 1097 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1098 | { |
8e893469 | 1099 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1100 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1101 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1102 | return QUOTA_OK; |
1103 | ||
1104 | if (dquot->dq_dqb.dqb_ihardlimit && | |
1105 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit && | |
1106 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1107 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1108 | return NO_QUOTA; |
1109 | } | |
1110 | ||
1111 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1112 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1113 | dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1114 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1115 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1116 | return NO_QUOTA; |
1117 | } | |
1118 | ||
1119 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1120 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1121 | dquot->dq_dqb.dqb_itime == 0) { | |
8e893469 | 1122 | *warntype = QUOTA_NL_ISOFTWARN; |
1da177e4 LT |
1123 | dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; |
1124 | } | |
1125 | ||
1126 | return QUOTA_OK; | |
1127 | } | |
1128 | ||
1129 | /* needs dq_data_lock */ | |
1130 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1131 | { | |
8e893469 | 1132 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1133 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1134 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1135 | return QUOTA_OK; |
1136 | ||
1137 | if (dquot->dq_dqb.dqb_bhardlimit && | |
12095460 | 1138 | dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1139 | !ignore_hardlimit(dquot)) { |
1140 | if (!prealloc) | |
8e893469 | 1141 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1142 | return NO_QUOTA; |
1143 | } | |
1144 | ||
1145 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
12095460 | 1146 | dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1147 | dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime && |
1148 | !ignore_hardlimit(dquot)) { | |
1149 | if (!prealloc) | |
8e893469 | 1150 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1151 | return NO_QUOTA; |
1152 | } | |
1153 | ||
1154 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
12095460 | 1155 | dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1156 | dquot->dq_dqb.dqb_btime == 0) { |
1157 | if (!prealloc) { | |
8e893469 | 1158 | *warntype = QUOTA_NL_BSOFTWARN; |
1da177e4 LT |
1159 | dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace; |
1160 | } | |
1161 | else | |
1162 | /* | |
1163 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1164 | * be always printed | |
1165 | */ | |
1166 | return NO_QUOTA; | |
1167 | } | |
1168 | ||
1169 | return QUOTA_OK; | |
1170 | } | |
1171 | ||
12095460 | 1172 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa JK |
1173 | { |
1174 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
f55abc0f JK |
1175 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1176 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1177 | return QUOTA_NL_NOWARN; |
1178 | ||
1179 | if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1180 | return QUOTA_NL_ISOFTBELOW; | |
1181 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
1182 | dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit) | |
1183 | return QUOTA_NL_IHARDBELOW; | |
1184 | return QUOTA_NL_NOWARN; | |
1185 | } | |
1186 | ||
1187 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1188 | { | |
1189 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1190 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1191 | return QUOTA_NL_NOWARN; |
1192 | ||
12095460 | 1193 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1194 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1195 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1196 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1197 | return QUOTA_NL_BHARDBELOW; |
1198 | return QUOTA_NL_NOWARN; | |
1199 | } | |
1da177e4 LT |
1200 | /* |
1201 | * Initialize quota pointers in inode | |
cc33412f JK |
1202 | * We do things in a bit complicated way but by that we avoid calling |
1203 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1da177e4 LT |
1204 | */ |
1205 | int dquot_initialize(struct inode *inode, int type) | |
1206 | { | |
1207 | unsigned int id = 0; | |
1208 | int cnt, ret = 0; | |
cc33412f JK |
1209 | struct dquot *got[MAXQUOTAS] = { NODQUOT, NODQUOT }; |
1210 | struct super_block *sb = inode->i_sb; | |
1da177e4 | 1211 | |
d3be915f IM |
1212 | /* First test before acquiring mutex - solves deadlocks when we |
1213 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1214 | if (IS_NOQUOTA(inode)) |
1215 | return 0; | |
cc33412f JK |
1216 | |
1217 | /* First get references to structures we might need. */ | |
1218 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1219 | if (type != -1 && cnt != type) | |
1220 | continue; | |
1221 | switch (cnt) { | |
1222 | case USRQUOTA: | |
1223 | id = inode->i_uid; | |
1224 | break; | |
1225 | case GRPQUOTA: | |
1226 | id = inode->i_gid; | |
1227 | break; | |
1228 | } | |
1229 | got[cnt] = dqget(sb, id, cnt); | |
1230 | } | |
1231 | ||
1232 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1233 | /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ |
1234 | if (IS_NOQUOTA(inode)) | |
1235 | goto out_err; | |
1236 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1237 | if (type != -1 && cnt != type) | |
1238 | continue; | |
cc33412f JK |
1239 | /* Avoid races with quotaoff() */ |
1240 | if (!sb_has_quota_active(sb, cnt)) | |
1241 | continue; | |
1da177e4 | 1242 | if (inode->i_dquot[cnt] == NODQUOT) { |
cc33412f JK |
1243 | inode->i_dquot[cnt] = got[cnt]; |
1244 | got[cnt] = NODQUOT; | |
1da177e4 LT |
1245 | } |
1246 | } | |
1247 | out_err: | |
cc33412f JK |
1248 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1249 | /* Drop unused references */ | |
1250 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1251 | dqput(got[cnt]); | |
1da177e4 LT |
1252 | return ret; |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Release all quotas referenced by inode | |
1da177e4 | 1257 | */ |
cc33412f | 1258 | int dquot_drop(struct inode *inode) |
1da177e4 LT |
1259 | { |
1260 | int cnt; | |
cc33412f | 1261 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1262 | |
cc33412f | 1263 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1264 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1265 | put[cnt] = inode->i_dquot[cnt]; |
1266 | inode->i_dquot[cnt] = NODQUOT; | |
1da177e4 LT |
1267 | } |
1268 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
cc33412f JK |
1269 | |
1270 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1271 | dqput(put[cnt]); | |
1da177e4 LT |
1272 | return 0; |
1273 | } | |
1274 | ||
b85f4b87 JK |
1275 | /* Wrapper to remove references to quota structures from inode */ |
1276 | void vfs_dq_drop(struct inode *inode) | |
1277 | { | |
1278 | /* Here we can get arbitrary inode from clear_inode() so we have | |
1279 | * to be careful. OTOH we don't need locking as quota operations | |
1280 | * are allowed to change only at mount time */ | |
1281 | if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op | |
1282 | && inode->i_sb->dq_op->drop) { | |
1283 | int cnt; | |
1284 | /* Test before calling to rule out calls from proc and such | |
1285 | * where we are not allowed to block. Note that this is | |
1286 | * actually reliable test even without the lock - the caller | |
1287 | * must assure that nobody can come after the DQUOT_DROP and | |
1288 | * add quota pointers back anyway */ | |
1289 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1290 | if (inode->i_dquot[cnt] != NODQUOT) | |
1291 | break; | |
1292 | if (cnt < MAXQUOTAS) | |
1293 | inode->i_sb->dq_op->drop(inode); | |
1294 | } | |
1295 | } | |
1296 | ||
1da177e4 LT |
1297 | /* |
1298 | * Following four functions update i_blocks+i_bytes fields and | |
1299 | * quota information (together with appropriate checks) | |
1300 | * NOTE: We absolutely rely on the fact that caller dirties | |
1301 | * the inode (usually macros in quotaops.h care about this) and | |
1302 | * holds a handle for the current transaction so that dquot write and | |
1303 | * inode write go into the same transaction. | |
1304 | */ | |
1305 | ||
1306 | /* | |
1307 | * This operation can block, but only after everything is updated | |
1308 | */ | |
1309 | int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) | |
1310 | { | |
1311 | int cnt, ret = NO_QUOTA; | |
1312 | char warntype[MAXQUOTAS]; | |
1313 | ||
d3be915f IM |
1314 | /* First test before acquiring mutex - solves deadlocks when we |
1315 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1316 | if (IS_NOQUOTA(inode)) { |
1317 | out_add: | |
1318 | inode_add_bytes(inode, number); | |
1319 | return QUOTA_OK; | |
1320 | } | |
1321 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1322 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1323 | |
1324 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1325 | if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */ | |
1326 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1327 | goto out_add; | |
1328 | } | |
1329 | spin_lock(&dq_data_lock); | |
1330 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1331 | if (inode->i_dquot[cnt] == NODQUOT) | |
1332 | continue; | |
1333 | if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA) | |
1334 | goto warn_put_all; | |
1335 | } | |
1336 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1337 | if (inode->i_dquot[cnt] == NODQUOT) | |
1338 | continue; | |
1339 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1340 | } | |
1341 | inode_add_bytes(inode, number); | |
1342 | ret = QUOTA_OK; | |
1343 | warn_put_all: | |
1344 | spin_unlock(&dq_data_lock); | |
1345 | if (ret == QUOTA_OK) | |
1346 | /* Dirtify all the dquots - this can block when journalling */ | |
1347 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1348 | if (inode->i_dquot[cnt]) | |
1349 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1350 | flush_warnings(inode->i_dquot, warntype); | |
1351 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1352 | return ret; | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * This operation can block, but only after everything is updated | |
1357 | */ | |
12095460 | 1358 | int dquot_alloc_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1359 | { |
1360 | int cnt, ret = NO_QUOTA; | |
1361 | char warntype[MAXQUOTAS]; | |
1362 | ||
d3be915f IM |
1363 | /* First test before acquiring mutex - solves deadlocks when we |
1364 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1365 | if (IS_NOQUOTA(inode)) |
1366 | return QUOTA_OK; | |
1367 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1368 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1369 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1370 | if (IS_NOQUOTA(inode)) { | |
1371 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1372 | return QUOTA_OK; | |
1373 | } | |
1374 | spin_lock(&dq_data_lock); | |
1375 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1376 | if (inode->i_dquot[cnt] == NODQUOT) | |
1377 | continue; | |
1378 | if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA) | |
1379 | goto warn_put_all; | |
1380 | } | |
1381 | ||
1382 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1383 | if (inode->i_dquot[cnt] == NODQUOT) | |
1384 | continue; | |
1385 | dquot_incr_inodes(inode->i_dquot[cnt], number); | |
1386 | } | |
1387 | ret = QUOTA_OK; | |
1388 | warn_put_all: | |
1389 | spin_unlock(&dq_data_lock); | |
1390 | if (ret == QUOTA_OK) | |
1391 | /* Dirtify all the dquots - this can block when journalling */ | |
1392 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1393 | if (inode->i_dquot[cnt]) | |
1394 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
087ee8d5 | 1395 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1396 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1397 | return ret; | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * This operation can block, but only after everything is updated | |
1402 | */ | |
1403 | int dquot_free_space(struct inode *inode, qsize_t number) | |
1404 | { | |
1405 | unsigned int cnt; | |
657d3bfa | 1406 | char warntype[MAXQUOTAS]; |
1da177e4 | 1407 | |
d3be915f IM |
1408 | /* First test before acquiring mutex - solves deadlocks when we |
1409 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1410 | if (IS_NOQUOTA(inode)) { |
1411 | out_sub: | |
1412 | inode_sub_bytes(inode, number); | |
1413 | return QUOTA_OK; | |
1414 | } | |
657d3bfa | 1415 | |
1da177e4 LT |
1416 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1417 | /* Now recheck reliably when holding dqptr_sem */ | |
1418 | if (IS_NOQUOTA(inode)) { | |
1419 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1420 | goto out_sub; | |
1421 | } | |
1422 | spin_lock(&dq_data_lock); | |
1423 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1424 | if (inode->i_dquot[cnt] == NODQUOT) | |
1425 | continue; | |
657d3bfa | 1426 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1427 | dquot_decr_space(inode->i_dquot[cnt], number); |
1428 | } | |
1429 | inode_sub_bytes(inode, number); | |
1430 | spin_unlock(&dq_data_lock); | |
1431 | /* Dirtify all the dquots - this can block when journalling */ | |
1432 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1433 | if (inode->i_dquot[cnt]) | |
1434 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
657d3bfa | 1435 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1436 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1437 | return QUOTA_OK; | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * This operation can block, but only after everything is updated | |
1442 | */ | |
12095460 | 1443 | int dquot_free_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1444 | { |
1445 | unsigned int cnt; | |
657d3bfa | 1446 | char warntype[MAXQUOTAS]; |
1da177e4 | 1447 | |
d3be915f IM |
1448 | /* First test before acquiring mutex - solves deadlocks when we |
1449 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1450 | if (IS_NOQUOTA(inode)) |
1451 | return QUOTA_OK; | |
657d3bfa | 1452 | |
1da177e4 LT |
1453 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1454 | /* Now recheck reliably when holding dqptr_sem */ | |
1455 | if (IS_NOQUOTA(inode)) { | |
1456 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1457 | return QUOTA_OK; | |
1458 | } | |
1459 | spin_lock(&dq_data_lock); | |
1460 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1461 | if (inode->i_dquot[cnt] == NODQUOT) | |
1462 | continue; | |
657d3bfa | 1463 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1464 | dquot_decr_inodes(inode->i_dquot[cnt], number); |
1465 | } | |
1466 | spin_unlock(&dq_data_lock); | |
1467 | /* Dirtify all the dquots - this can block when journalling */ | |
1468 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1469 | if (inode->i_dquot[cnt]) | |
1470 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
657d3bfa | 1471 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1472 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1473 | return QUOTA_OK; | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1478 | * | |
1479 | * This operation can block, but only after everything is updated | |
1480 | * A transaction must be started when entering this function. | |
1481 | */ | |
1482 | int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
1483 | { | |
1484 | qsize_t space; | |
1485 | struct dquot *transfer_from[MAXQUOTAS]; | |
1486 | struct dquot *transfer_to[MAXQUOTAS]; | |
cc33412f JK |
1487 | int cnt, ret = QUOTA_OK; |
1488 | int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, | |
1489 | chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; | |
657d3bfa JK |
1490 | char warntype_to[MAXQUOTAS]; |
1491 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1492 | |
d3be915f IM |
1493 | /* First test before acquiring mutex - solves deadlocks when we |
1494 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1495 | if (IS_NOQUOTA(inode)) |
1496 | return QUOTA_OK; | |
cc33412f | 1497 | /* Initialize the arrays */ |
1da177e4 | 1498 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1499 | transfer_from[cnt] = NODQUOT; |
1500 | transfer_to[cnt] = NODQUOT; | |
657d3bfa | 1501 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1502 | switch (cnt) { |
1503 | case USRQUOTA: | |
1504 | if (!chuid) | |
1505 | continue; | |
1506 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt); | |
1507 | break; | |
1508 | case GRPQUOTA: | |
1509 | if (!chgid) | |
1510 | continue; | |
1511 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt); | |
1512 | break; | |
1513 | } | |
1514 | } | |
cc33412f JK |
1515 | |
1516 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1517 | /* Now recheck reliably when holding dqptr_sem */ | |
1518 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ | |
1519 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1520 | goto put_all; | |
1521 | } | |
1da177e4 LT |
1522 | spin_lock(&dq_data_lock); |
1523 | space = inode_get_bytes(inode); | |
1524 | /* Build the transfer_from list and check the limits */ | |
1525 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1526 | if (transfer_to[cnt] == NODQUOT) | |
1527 | continue; | |
1528 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
657d3bfa JK |
1529 | if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == |
1530 | NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, | |
1531 | warntype_to + cnt) == NO_QUOTA) | |
cc33412f | 1532 | goto over_quota; |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | /* | |
1536 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1537 | */ | |
1538 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1539 | /* | |
1540 | * Skip changes for same uid or gid or for turned off quota-type. | |
1541 | */ | |
1542 | if (transfer_to[cnt] == NODQUOT) | |
1543 | continue; | |
1544 | ||
1545 | /* Due to IO error we might not have transfer_from[] structure */ | |
1546 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1547 | warntype_from_inodes[cnt] = |
1548 | info_idq_free(transfer_from[cnt], 1); | |
1549 | warntype_from_space[cnt] = | |
1550 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 LT |
1551 | dquot_decr_inodes(transfer_from[cnt], 1); |
1552 | dquot_decr_space(transfer_from[cnt], space); | |
1553 | } | |
1554 | ||
1555 | dquot_incr_inodes(transfer_to[cnt], 1); | |
1556 | dquot_incr_space(transfer_to[cnt], space); | |
1557 | ||
1558 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1559 | } | |
1da177e4 | 1560 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1561 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1562 | ||
1da177e4 LT |
1563 | /* Dirtify all the dquots - this can block when journalling */ |
1564 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1565 | if (transfer_from[cnt]) | |
1566 | mark_dquot_dirty(transfer_from[cnt]); | |
cc33412f | 1567 | if (transfer_to[cnt]) { |
1da177e4 | 1568 | mark_dquot_dirty(transfer_to[cnt]); |
cc33412f JK |
1569 | /* The reference we got is transferred to the inode */ |
1570 | transfer_to[cnt] = NODQUOT; | |
1571 | } | |
1da177e4 | 1572 | } |
cc33412f | 1573 | warn_put_all: |
657d3bfa JK |
1574 | flush_warnings(transfer_to, warntype_to); |
1575 | flush_warnings(transfer_from, warntype_from_inodes); | |
1576 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1577 | put_all: |
1da177e4 | 1578 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1579 | dqput(transfer_from[cnt]); |
1580 | dqput(transfer_to[cnt]); | |
1da177e4 | 1581 | } |
1da177e4 | 1582 | return ret; |
cc33412f JK |
1583 | over_quota: |
1584 | spin_unlock(&dq_data_lock); | |
1585 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1586 | /* Clear dquot pointers we don't want to dqput() */ | |
1587 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1588 | transfer_from[cnt] = NODQUOT; | |
1589 | ret = NO_QUOTA; | |
1590 | goto warn_put_all; | |
1da177e4 LT |
1591 | } |
1592 | ||
b85f4b87 JK |
1593 | /* Wrapper for transferring ownership of an inode */ |
1594 | int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) | |
1595 | { | |
f55abc0f | 1596 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
b85f4b87 JK |
1597 | vfs_dq_init(inode); |
1598 | if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) | |
1599 | return 1; | |
1600 | } | |
1601 | return 0; | |
1602 | } | |
1603 | ||
1604 | ||
1da177e4 LT |
1605 | /* |
1606 | * Write info of quota file to disk | |
1607 | */ | |
1608 | int dquot_commit_info(struct super_block *sb, int type) | |
1609 | { | |
1610 | int ret; | |
1611 | struct quota_info *dqopt = sb_dqopt(sb); | |
1612 | ||
d3be915f | 1613 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1614 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1615 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1616 | return ret; |
1617 | } | |
1618 | ||
1619 | /* | |
1620 | * Definitions of diskquota operations. | |
1621 | */ | |
1622 | struct dquot_operations dquot_operations = { | |
1623 | .initialize = dquot_initialize, | |
1624 | .drop = dquot_drop, | |
1625 | .alloc_space = dquot_alloc_space, | |
1626 | .alloc_inode = dquot_alloc_inode, | |
1627 | .free_space = dquot_free_space, | |
1628 | .free_inode = dquot_free_inode, | |
1629 | .transfer = dquot_transfer, | |
1630 | .write_dquot = dquot_commit, | |
1631 | .acquire_dquot = dquot_acquire, | |
1632 | .release_dquot = dquot_release, | |
1633 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1634 | .write_info = dquot_commit_info, |
1635 | .alloc_dquot = dquot_alloc, | |
1636 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1637 | }; |
1638 | ||
1da177e4 LT |
1639 | /* |
1640 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1641 | */ | |
f55abc0f | 1642 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1643 | { |
0ff5af83 | 1644 | int cnt, ret = 0; |
1da177e4 LT |
1645 | struct quota_info *dqopt = sb_dqopt(sb); |
1646 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1647 | |
f55abc0f JK |
1648 | /* Cannot turn off usage accounting without turning off limits, or |
1649 | * suspend quotas and simultaneously turn quotas off. */ | |
1650 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1651 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1652 | DQUOT_USAGE_ENABLED))) | |
1653 | return -EINVAL; | |
1654 | ||
1da177e4 | 1655 | /* We need to serialize quota_off() for device */ |
d3be915f | 1656 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1657 | |
1658 | /* | |
1659 | * Skip everything if there's nothing to do. We have to do this because | |
1660 | * sometimes we are called when fill_super() failed and calling | |
1661 | * sync_fs() in such cases does no good. | |
1662 | */ | |
f55abc0f | 1663 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1664 | mutex_unlock(&dqopt->dqonoff_mutex); |
1665 | return 0; | |
1666 | } | |
1da177e4 LT |
1667 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1668 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1669 | if (type != -1 && cnt != type) |
1670 | continue; | |
f55abc0f | 1671 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1672 | continue; |
f55abc0f JK |
1673 | |
1674 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1675 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1676 | dqopt->flags |= |
1677 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1678 | spin_unlock(&dq_state_lock); |
f55abc0f | 1679 | } else { |
cc33412f | 1680 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1681 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1682 | /* Turning off suspended quotas? */ | |
1683 | if (!sb_has_quota_loaded(sb, cnt) && | |
1684 | sb_has_quota_suspended(sb, cnt)) { | |
1685 | dqopt->flags &= ~dquot_state_flag( | |
1686 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1687 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1688 | iput(dqopt->files[cnt]); |
1689 | dqopt->files[cnt] = NULL; | |
1690 | continue; | |
1691 | } | |
cc33412f | 1692 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1693 | } |
f55abc0f JK |
1694 | |
1695 | /* We still have to keep quota loaded? */ | |
1696 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1697 | continue; |
1da177e4 LT |
1698 | |
1699 | /* Note: these are blocking operations */ | |
1700 | drop_dquot_ref(sb, cnt); | |
1701 | invalidate_dquots(sb, cnt); | |
1702 | /* | |
1703 | * Now all dquots should be invalidated, all writes done so we should be only | |
1704 | * users of the info. No locks needed. | |
1705 | */ | |
1706 | if (info_dirty(&dqopt->info[cnt])) | |
1707 | sb->dq_op->write_info(sb, cnt); | |
1708 | if (dqopt->ops[cnt]->free_file_info) | |
1709 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1710 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1711 | ||
1712 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1713 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1714 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1715 | dqopt->info[cnt].dqi_flags = 0; |
1716 | dqopt->info[cnt].dqi_igrace = 0; | |
1717 | dqopt->info[cnt].dqi_bgrace = 0; | |
1718 | dqopt->ops[cnt] = NULL; | |
1719 | } | |
d3be915f | 1720 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1721 | |
1722 | /* Skip syncing and setting flags if quota files are hidden */ | |
1723 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1724 | goto put_inodes; | |
1725 | ||
1da177e4 | 1726 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1727 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1728 | if (sb->s_op->sync_fs) |
1729 | sb->s_op->sync_fs(sb, 1); | |
1730 | sync_blockdev(sb->s_bdev); | |
1731 | /* Now the quota files are just ordinary files and we can set the | |
1732 | * inode flags back. Moreover we discard the pagecache so that | |
1733 | * userspace sees the writes we did bypassing the pagecache. We | |
1734 | * must also discard the blockdev buffers so that we see the | |
1735 | * changes done by userspace on the next quotaon() */ | |
1736 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1737 | if (toputinode[cnt]) { | |
d3be915f | 1738 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1739 | /* If quota was reenabled in the meantime, we have |
1740 | * nothing to do */ | |
f55abc0f | 1741 | if (!sb_has_quota_loaded(sb, cnt)) { |
7925409e | 1742 | mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1743 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1744 | S_NOATIME | S_NOQUOTA); | |
1745 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); | |
1b1dcc1b | 1746 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1747 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1748 | } |
d3be915f | 1749 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1750 | } |
1751 | if (sb->s_bdev) | |
1752 | invalidate_bdev(sb->s_bdev); | |
1753 | put_inodes: | |
1754 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1755 | if (toputinode[cnt]) { | |
0ff5af83 | 1756 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1757 | * can reenable quota on the subsequent remount RW. We |
1758 | * have to check 'flags' variable and not use sb_has_ | |
1759 | * function because another quotaon / quotaoff could | |
1760 | * change global state before we got here. We refuse | |
1761 | * to suspend quotas when there is pending delete on | |
1762 | * the quota file... */ | |
1763 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1764 | iput(toputinode[cnt]); |
1765 | else if (!toputinode[cnt]->i_nlink) | |
1766 | ret = -EBUSY; | |
1da177e4 | 1767 | } |
0ff5af83 | 1768 | return ret; |
1da177e4 LT |
1769 | } |
1770 | ||
f55abc0f JK |
1771 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1772 | { | |
1773 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1774 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1775 | } | |
1776 | ||
1da177e4 LT |
1777 | /* |
1778 | * Turn quotas on on a device | |
1779 | */ | |
1780 | ||
f55abc0f JK |
1781 | /* |
1782 | * Helper function to turn quotas on when we already have the inode of | |
1783 | * quota file and no quota information is loaded. | |
1784 | */ | |
1785 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1786 | unsigned int flags) | |
1da177e4 LT |
1787 | { |
1788 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1789 | struct super_block *sb = inode->i_sb; | |
1790 | struct quota_info *dqopt = sb_dqopt(sb); | |
1791 | int error; | |
1792 | int oldflags = -1; | |
1793 | ||
1794 | if (!fmt) | |
1795 | return -ESRCH; | |
1796 | if (!S_ISREG(inode->i_mode)) { | |
1797 | error = -EACCES; | |
1798 | goto out_fmt; | |
1799 | } | |
1800 | if (IS_RDONLY(inode)) { | |
1801 | error = -EROFS; | |
1802 | goto out_fmt; | |
1803 | } | |
1804 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
1805 | error = -EINVAL; | |
1806 | goto out_fmt; | |
1807 | } | |
f55abc0f JK |
1808 | /* Usage always has to be set... */ |
1809 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
1810 | error = -EINVAL; | |
1811 | goto out_fmt; | |
1812 | } | |
1da177e4 | 1813 | |
ca785ec6 JK |
1814 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
1815 | /* As we bypass the pagecache we must now flush the inode so | |
1816 | * that we see all the changes from userspace... */ | |
1817 | write_inode_now(inode, 1); | |
1818 | /* And now flush the block cache so that kernel sees the | |
1819 | * changes */ | |
1820 | invalidate_bdev(sb->s_bdev); | |
1821 | } | |
1b1dcc1b | 1822 | mutex_lock(&inode->i_mutex); |
d3be915f | 1823 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 1824 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
1825 | error = -EBUSY; |
1826 | goto out_lock; | |
1827 | } | |
ca785ec6 JK |
1828 | |
1829 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
1830 | /* We don't want quota and atime on quota files (deadlocks | |
1831 | * possible) Also nobody should write to the file - we use | |
1832 | * special IO operations which ignore the immutable bit. */ | |
1833 | down_write(&dqopt->dqptr_sem); | |
1834 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA); | |
1835 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; | |
1836 | up_write(&dqopt->dqptr_sem); | |
1837 | sb->dq_op->drop(inode); | |
1838 | } | |
1da177e4 LT |
1839 | |
1840 | error = -EIO; | |
1841 | dqopt->files[type] = igrab(inode); | |
1842 | if (!dqopt->files[type]) | |
1843 | goto out_lock; | |
1844 | error = -EINVAL; | |
1845 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
1846 | goto out_file_init; | |
1847 | ||
1848 | dqopt->ops[type] = fmt->qf_ops; | |
1849 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 1850 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 1851 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 1852 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1853 | if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) { |
d3be915f | 1854 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1855 | goto out_file_init; |
1856 | } | |
d3be915f | 1857 | mutex_unlock(&dqopt->dqio_mutex); |
1b1dcc1b | 1858 | mutex_unlock(&inode->i_mutex); |
cc33412f | 1859 | spin_lock(&dq_state_lock); |
f55abc0f | 1860 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 1861 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
1862 | |
1863 | add_dquot_ref(sb, type); | |
d3be915f | 1864 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1865 | |
1866 | return 0; | |
1867 | ||
1868 | out_file_init: | |
1869 | dqopt->files[type] = NULL; | |
1870 | iput(inode); | |
1871 | out_lock: | |
d3be915f | 1872 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1873 | if (oldflags != -1) { |
1874 | down_write(&dqopt->dqptr_sem); | |
1875 | /* Set the flags back (in the case of accidental quotaon() | |
1876 | * on a wrong file we don't want to mess up the flags) */ | |
1877 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
1878 | inode->i_flags |= oldflags; | |
1879 | up_write(&dqopt->dqptr_sem); | |
1880 | } | |
1b1dcc1b | 1881 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1882 | out_fmt: |
1883 | put_quota_format(fmt); | |
1884 | ||
1885 | return error; | |
1886 | } | |
1887 | ||
0ff5af83 JK |
1888 | /* Reenable quotas on remount RW */ |
1889 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
1890 | { | |
1891 | struct quota_info *dqopt = sb_dqopt(sb); | |
1892 | struct inode *inode; | |
1893 | int ret; | |
f55abc0f | 1894 | unsigned int flags; |
0ff5af83 JK |
1895 | |
1896 | mutex_lock(&dqopt->dqonoff_mutex); | |
1897 | if (!sb_has_quota_suspended(sb, type)) { | |
1898 | mutex_unlock(&dqopt->dqonoff_mutex); | |
1899 | return 0; | |
1900 | } | |
0ff5af83 JK |
1901 | inode = dqopt->files[type]; |
1902 | dqopt->files[type] = NULL; | |
cc33412f | 1903 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1904 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
1905 | DQUOT_LIMITS_ENABLED, type); | |
1906 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 1907 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
1908 | mutex_unlock(&dqopt->dqonoff_mutex); |
1909 | ||
f55abc0f JK |
1910 | flags = dquot_generic_flag(flags, type); |
1911 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
1912 | flags); | |
0ff5af83 JK |
1913 | iput(inode); |
1914 | ||
1915 | return ret; | |
1916 | } | |
1917 | ||
77e69dac AV |
1918 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
1919 | struct path *path) | |
1920 | { | |
1921 | int error = security_quota_on(path->dentry); | |
1922 | if (error) | |
1923 | return error; | |
1924 | /* Quota file not on the same filesystem? */ | |
1925 | if (path->mnt->mnt_sb != sb) | |
1926 | error = -EXDEV; | |
1927 | else | |
f55abc0f JK |
1928 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
1929 | format_id, DQUOT_USAGE_ENABLED | | |
1930 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
1931 | return error; |
1932 | } | |
1933 | ||
8264613d | 1934 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 1935 | int remount) |
1da177e4 | 1936 | { |
8264613d | 1937 | struct path path; |
1da177e4 LT |
1938 | int error; |
1939 | ||
0ff5af83 JK |
1940 | if (remount) |
1941 | return vfs_quota_on_remount(sb, type); | |
1942 | ||
8264613d | 1943 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 1944 | if (!error) { |
8264613d AV |
1945 | error = vfs_quota_on_path(sb, type, format_id, &path); |
1946 | path_put(&path); | |
77e69dac | 1947 | } |
1da177e4 LT |
1948 | return error; |
1949 | } | |
1950 | ||
f55abc0f JK |
1951 | /* |
1952 | * More powerful function for turning on quotas allowing setting | |
1953 | * of individual quota flags | |
1954 | */ | |
1955 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
1956 | unsigned int flags) | |
1957 | { | |
1958 | int ret = 0; | |
1959 | struct super_block *sb = inode->i_sb; | |
1960 | struct quota_info *dqopt = sb_dqopt(sb); | |
1961 | ||
1962 | /* Just unsuspend quotas? */ | |
1963 | if (flags & DQUOT_SUSPENDED) | |
1964 | return vfs_quota_on_remount(sb, type); | |
1965 | if (!flags) | |
1966 | return 0; | |
1967 | /* Just updating flags needed? */ | |
1968 | if (sb_has_quota_loaded(sb, type)) { | |
1969 | mutex_lock(&dqopt->dqonoff_mutex); | |
1970 | /* Now do a reliable test... */ | |
1971 | if (!sb_has_quota_loaded(sb, type)) { | |
1972 | mutex_unlock(&dqopt->dqonoff_mutex); | |
1973 | goto load_quota; | |
1974 | } | |
1975 | if (flags & DQUOT_USAGE_ENABLED && | |
1976 | sb_has_quota_usage_enabled(sb, type)) { | |
1977 | ret = -EBUSY; | |
1978 | goto out_lock; | |
1979 | } | |
1980 | if (flags & DQUOT_LIMITS_ENABLED && | |
1981 | sb_has_quota_limits_enabled(sb, type)) { | |
1982 | ret = -EBUSY; | |
1983 | goto out_lock; | |
1984 | } | |
cc33412f | 1985 | spin_lock(&dq_state_lock); |
f55abc0f | 1986 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 1987 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1988 | out_lock: |
1989 | mutex_unlock(&dqopt->dqonoff_mutex); | |
1990 | return ret; | |
1991 | } | |
1992 | ||
1993 | load_quota: | |
1994 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
1995 | } | |
1996 | ||
1da177e4 LT |
1997 | /* |
1998 | * This function is used when filesystem needs to initialize quotas | |
1999 | * during mount time. | |
2000 | */ | |
84de856e CH |
2001 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2002 | int format_id, int type) | |
1da177e4 | 2003 | { |
84de856e | 2004 | struct dentry *dentry; |
1da177e4 LT |
2005 | int error; |
2006 | ||
2fa389c5 | 2007 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2008 | if (IS_ERR(dentry)) |
2009 | return PTR_ERR(dentry); | |
2010 | ||
154f484b JK |
2011 | if (!dentry->d_inode) { |
2012 | error = -ENOENT; | |
2013 | goto out; | |
2014 | } | |
2015 | ||
1da177e4 | 2016 | error = security_quota_on(dentry); |
84de856e | 2017 | if (!error) |
f55abc0f JK |
2018 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2019 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2020 | |
154f484b | 2021 | out: |
84de856e CH |
2022 | dput(dentry); |
2023 | return error; | |
1da177e4 LT |
2024 | } |
2025 | ||
b85f4b87 JK |
2026 | /* Wrapper to turn on quotas when remounting rw */ |
2027 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2028 | { | |
2029 | int cnt; | |
2030 | int ret = 0, err; | |
2031 | ||
2032 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2033 | return -ENOSYS; | |
2034 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2035 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2036 | if (err < 0 && !ret) | |
2037 | ret = err; | |
2038 | } | |
2039 | return ret; | |
2040 | } | |
2041 | ||
12095460 JK |
2042 | static inline qsize_t qbtos(qsize_t blocks) |
2043 | { | |
2044 | return blocks << QIF_DQBLKSIZE_BITS; | |
2045 | } | |
2046 | ||
2047 | static inline qsize_t stoqb(qsize_t space) | |
2048 | { | |
2049 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2050 | } | |
2051 | ||
1da177e4 LT |
2052 | /* Generic routine for getting common part of quota structure */ |
2053 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2054 | { | |
2055 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2056 | ||
2057 | spin_lock(&dq_data_lock); | |
12095460 JK |
2058 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2059 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
1da177e4 LT |
2060 | di->dqb_curspace = dm->dqb_curspace; |
2061 | di->dqb_ihardlimit = dm->dqb_ihardlimit; | |
2062 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2063 | di->dqb_curinodes = dm->dqb_curinodes; | |
2064 | di->dqb_btime = dm->dqb_btime; | |
2065 | di->dqb_itime = dm->dqb_itime; | |
2066 | di->dqb_valid = QIF_ALL; | |
2067 | spin_unlock(&dq_data_lock); | |
2068 | } | |
2069 | ||
2070 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
2071 | { | |
2072 | struct dquot *dquot; | |
2073 | ||
cc33412f JK |
2074 | dquot = dqget(sb, id, type); |
2075 | if (dquot == NODQUOT) | |
1da177e4 | 2076 | return -ESRCH; |
1da177e4 LT |
2077 | do_get_dqblk(dquot, di); |
2078 | dqput(dquot); | |
cc33412f | 2079 | |
1da177e4 LT |
2080 | return 0; |
2081 | } | |
2082 | ||
2083 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2084 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2085 | { |
2086 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2087 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2088 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2089 | ||
2090 | if ((di->dqb_valid & QIF_BLIMITS && | |
2091 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2092 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2093 | (di->dqb_valid & QIF_ILIMITS && | |
2094 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2095 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2096 | return -ERANGE; | |
1da177e4 LT |
2097 | |
2098 | spin_lock(&dq_data_lock); | |
2099 | if (di->dqb_valid & QIF_SPACE) { | |
2100 | dm->dqb_curspace = di->dqb_curspace; | |
2101 | check_blim = 1; | |
4d59bce4 | 2102 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2103 | } |
2104 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2105 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2106 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2107 | check_blim = 1; |
4d59bce4 | 2108 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2109 | } |
2110 | if (di->dqb_valid & QIF_INODES) { | |
2111 | dm->dqb_curinodes = di->dqb_curinodes; | |
2112 | check_ilim = 1; | |
4d59bce4 | 2113 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2114 | } |
2115 | if (di->dqb_valid & QIF_ILIMITS) { | |
2116 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2117 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2118 | check_ilim = 1; | |
4d59bce4 | 2119 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2120 | } |
4d59bce4 | 2121 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2122 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2123 | check_blim = 1; |
4d59bce4 JK |
2124 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2125 | } | |
2126 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2127 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2128 | check_ilim = 1; |
4d59bce4 JK |
2129 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2130 | } | |
1da177e4 LT |
2131 | |
2132 | if (check_blim) { | |
12095460 | 2133 | if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) { |
1da177e4 LT |
2134 | dm->dqb_btime = 0; |
2135 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
2136 | } | |
2137 | else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2138 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2139 | } |
2140 | if (check_ilim) { | |
2141 | if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
2142 | dm->dqb_itime = 0; | |
2143 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
2144 | } | |
2145 | else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2146 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 LT |
2147 | } |
2148 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit) | |
2149 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2150 | else | |
2151 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2152 | spin_unlock(&dq_data_lock); | |
2153 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2154 | |
2155 | return 0; | |
1da177e4 LT |
2156 | } |
2157 | ||
2158 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
2159 | { | |
2160 | struct dquot *dquot; | |
338bf9af | 2161 | int rc; |
1da177e4 | 2162 | |
f55abc0f JK |
2163 | dquot = dqget(sb, id, type); |
2164 | if (!dquot) { | |
2165 | rc = -ESRCH; | |
2166 | goto out; | |
1da177e4 | 2167 | } |
338bf9af | 2168 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2169 | dqput(dquot); |
f55abc0f | 2170 | out: |
338bf9af | 2171 | return rc; |
1da177e4 LT |
2172 | } |
2173 | ||
2174 | /* Generic routine for getting common part of quota file information */ | |
2175 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2176 | { | |
2177 | struct mem_dqinfo *mi; | |
2178 | ||
d3be915f | 2179 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2180 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2181 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2182 | return -ESRCH; |
2183 | } | |
2184 | mi = sb_dqopt(sb)->info + type; | |
2185 | spin_lock(&dq_data_lock); | |
2186 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2187 | ii->dqi_igrace = mi->dqi_igrace; | |
2188 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2189 | ii->dqi_valid = IIF_ALL; | |
2190 | spin_unlock(&dq_data_lock); | |
d3be915f | 2191 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2192 | return 0; |
2193 | } | |
2194 | ||
2195 | /* Generic routine for setting common part of quota file information */ | |
2196 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2197 | { | |
2198 | struct mem_dqinfo *mi; | |
f55abc0f | 2199 | int err = 0; |
1da177e4 | 2200 | |
d3be915f | 2201 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2202 | if (!sb_has_quota_active(sb, type)) { |
2203 | err = -ESRCH; | |
2204 | goto out; | |
1da177e4 LT |
2205 | } |
2206 | mi = sb_dqopt(sb)->info + type; | |
2207 | spin_lock(&dq_data_lock); | |
2208 | if (ii->dqi_valid & IIF_BGRACE) | |
2209 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2210 | if (ii->dqi_valid & IIF_IGRACE) | |
2211 | mi->dqi_igrace = ii->dqi_igrace; | |
2212 | if (ii->dqi_valid & IIF_FLAGS) | |
2213 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK); | |
2214 | spin_unlock(&dq_data_lock); | |
2215 | mark_info_dirty(sb, type); | |
2216 | /* Force write to disk */ | |
2217 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2218 | out: |
d3be915f | 2219 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2220 | return err; |
1da177e4 LT |
2221 | } |
2222 | ||
2223 | struct quotactl_ops vfs_quotactl_ops = { | |
2224 | .quota_on = vfs_quota_on, | |
2225 | .quota_off = vfs_quota_off, | |
2226 | .quota_sync = vfs_quota_sync, | |
2227 | .get_info = vfs_get_dqinfo, | |
2228 | .set_info = vfs_set_dqinfo, | |
2229 | .get_dqblk = vfs_get_dqblk, | |
2230 | .set_dqblk = vfs_set_dqblk | |
2231 | }; | |
2232 | ||
2233 | static ctl_table fs_dqstats_table[] = { | |
2234 | { | |
2235 | .ctl_name = FS_DQ_LOOKUPS, | |
2236 | .procname = "lookups", | |
2237 | .data = &dqstats.lookups, | |
2238 | .maxlen = sizeof(int), | |
2239 | .mode = 0444, | |
2240 | .proc_handler = &proc_dointvec, | |
2241 | }, | |
2242 | { | |
2243 | .ctl_name = FS_DQ_DROPS, | |
2244 | .procname = "drops", | |
2245 | .data = &dqstats.drops, | |
2246 | .maxlen = sizeof(int), | |
2247 | .mode = 0444, | |
2248 | .proc_handler = &proc_dointvec, | |
2249 | }, | |
2250 | { | |
2251 | .ctl_name = FS_DQ_READS, | |
2252 | .procname = "reads", | |
2253 | .data = &dqstats.reads, | |
2254 | .maxlen = sizeof(int), | |
2255 | .mode = 0444, | |
2256 | .proc_handler = &proc_dointvec, | |
2257 | }, | |
2258 | { | |
2259 | .ctl_name = FS_DQ_WRITES, | |
2260 | .procname = "writes", | |
2261 | .data = &dqstats.writes, | |
2262 | .maxlen = sizeof(int), | |
2263 | .mode = 0444, | |
2264 | .proc_handler = &proc_dointvec, | |
2265 | }, | |
2266 | { | |
2267 | .ctl_name = FS_DQ_CACHE_HITS, | |
2268 | .procname = "cache_hits", | |
2269 | .data = &dqstats.cache_hits, | |
2270 | .maxlen = sizeof(int), | |
2271 | .mode = 0444, | |
2272 | .proc_handler = &proc_dointvec, | |
2273 | }, | |
2274 | { | |
2275 | .ctl_name = FS_DQ_ALLOCATED, | |
2276 | .procname = "allocated_dquots", | |
2277 | .data = &dqstats.allocated_dquots, | |
2278 | .maxlen = sizeof(int), | |
2279 | .mode = 0444, | |
2280 | .proc_handler = &proc_dointvec, | |
2281 | }, | |
2282 | { | |
2283 | .ctl_name = FS_DQ_FREE, | |
2284 | .procname = "free_dquots", | |
2285 | .data = &dqstats.free_dquots, | |
2286 | .maxlen = sizeof(int), | |
2287 | .mode = 0444, | |
2288 | .proc_handler = &proc_dointvec, | |
2289 | }, | |
2290 | { | |
2291 | .ctl_name = FS_DQ_SYNCS, | |
2292 | .procname = "syncs", | |
2293 | .data = &dqstats.syncs, | |
2294 | .maxlen = sizeof(int), | |
2295 | .mode = 0444, | |
2296 | .proc_handler = &proc_dointvec, | |
2297 | }, | |
8e893469 | 2298 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
2299 | { |
2300 | .ctl_name = FS_DQ_WARNINGS, | |
2301 | .procname = "warnings", | |
2302 | .data = &flag_print_warnings, | |
2303 | .maxlen = sizeof(int), | |
2304 | .mode = 0644, | |
2305 | .proc_handler = &proc_dointvec, | |
2306 | }, | |
8e893469 | 2307 | #endif |
1da177e4 LT |
2308 | { .ctl_name = 0 }, |
2309 | }; | |
2310 | ||
2311 | static ctl_table fs_table[] = { | |
2312 | { | |
2313 | .ctl_name = FS_DQSTATS, | |
2314 | .procname = "quota", | |
2315 | .mode = 0555, | |
2316 | .child = fs_dqstats_table, | |
2317 | }, | |
2318 | { .ctl_name = 0 }, | |
2319 | }; | |
2320 | ||
2321 | static ctl_table sys_table[] = { | |
2322 | { | |
2323 | .ctl_name = CTL_FS, | |
2324 | .procname = "fs", | |
2325 | .mode = 0555, | |
2326 | .child = fs_table, | |
2327 | }, | |
2328 | { .ctl_name = 0 }, | |
2329 | }; | |
2330 | ||
2331 | static int __init dquot_init(void) | |
2332 | { | |
2333 | int i; | |
2334 | unsigned long nr_hash, order; | |
2335 | ||
2336 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2337 | ||
0b4d4147 | 2338 | register_sysctl_table(sys_table); |
1da177e4 | 2339 | |
20c2df83 | 2340 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2341 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2342 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2343 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2344 | NULL); |
1da177e4 LT |
2345 | |
2346 | order = 0; | |
2347 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2348 | if (!dquot_hash) | |
2349 | panic("Cannot create dquot hash table"); | |
2350 | ||
2351 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2352 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2353 | dq_hash_bits = 0; | |
2354 | do { | |
2355 | dq_hash_bits++; | |
2356 | } while (nr_hash >> dq_hash_bits); | |
2357 | dq_hash_bits--; | |
2358 | ||
2359 | nr_hash = 1UL << dq_hash_bits; | |
2360 | dq_hash_mask = nr_hash - 1; | |
2361 | for (i = 0; i < nr_hash; i++) | |
2362 | INIT_HLIST_HEAD(dquot_hash + i); | |
2363 | ||
2364 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2365 | nr_hash, order, (PAGE_SIZE << order)); | |
2366 | ||
8e1f936b | 2367 | register_shrinker(&dqcache_shrinker); |
1da177e4 | 2368 | |
8e893469 JK |
2369 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
2370 | if (genl_register_family("a_genl_family) != 0) | |
2371 | printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n"); | |
2372 | #endif | |
2373 | ||
1da177e4 LT |
2374 | return 0; |
2375 | } | |
2376 | module_init(dquot_init); | |
2377 | ||
2378 | EXPORT_SYMBOL(register_quota_format); | |
2379 | EXPORT_SYMBOL(unregister_quota_format); | |
2380 | EXPORT_SYMBOL(dqstats); | |
2381 | EXPORT_SYMBOL(dq_data_lock); | |
f55abc0f | 2382 | EXPORT_SYMBOL(vfs_quota_enable); |
1da177e4 | 2383 | EXPORT_SYMBOL(vfs_quota_on); |
77e69dac | 2384 | EXPORT_SYMBOL(vfs_quota_on_path); |
1da177e4 | 2385 | EXPORT_SYMBOL(vfs_quota_on_mount); |
f55abc0f | 2386 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 2387 | EXPORT_SYMBOL(vfs_quota_off); |
12c77527 | 2388 | EXPORT_SYMBOL(dquot_scan_active); |
1da177e4 LT |
2389 | EXPORT_SYMBOL(vfs_quota_sync); |
2390 | EXPORT_SYMBOL(vfs_get_dqinfo); | |
2391 | EXPORT_SYMBOL(vfs_set_dqinfo); | |
2392 | EXPORT_SYMBOL(vfs_get_dqblk); | |
2393 | EXPORT_SYMBOL(vfs_set_dqblk); | |
2394 | EXPORT_SYMBOL(dquot_commit); | |
2395 | EXPORT_SYMBOL(dquot_commit_info); | |
2396 | EXPORT_SYMBOL(dquot_acquire); | |
2397 | EXPORT_SYMBOL(dquot_release); | |
2398 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); | |
2399 | EXPORT_SYMBOL(dquot_initialize); | |
2400 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 2401 | EXPORT_SYMBOL(vfs_dq_drop); |
3d9ea253 JK |
2402 | EXPORT_SYMBOL(dqget); |
2403 | EXPORT_SYMBOL(dqput); | |
1da177e4 LT |
2404 | EXPORT_SYMBOL(dquot_alloc_space); |
2405 | EXPORT_SYMBOL(dquot_alloc_inode); | |
2406 | EXPORT_SYMBOL(dquot_free_space); | |
2407 | EXPORT_SYMBOL(dquot_free_inode); | |
2408 | EXPORT_SYMBOL(dquot_transfer); | |
b85f4b87 JK |
2409 | EXPORT_SYMBOL(vfs_dq_transfer); |
2410 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |