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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
74 | #include <linux/kmod.h> | |
75 | #include <linux/namei.h> | |
76 | #include <linux/buffer_head.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
fb58b731 | 79 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
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 | ||
f18df228 MC |
902 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
903 | { | |
904 | dquot->dq_dqb.dqb_rsvspace += number; | |
905 | } | |
906 | ||
740d9dcd MC |
907 | /* |
908 | * Claim reserved quota space | |
909 | */ | |
910 | static void dquot_claim_reserved_space(struct dquot *dquot, | |
911 | qsize_t number) | |
912 | { | |
913 | WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); | |
914 | dquot->dq_dqb.dqb_curspace += number; | |
915 | dquot->dq_dqb.dqb_rsvspace -= number; | |
916 | } | |
917 | ||
918 | static inline | |
919 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
920 | { | |
921 | dquot->dq_dqb.dqb_rsvspace -= number; | |
922 | } | |
923 | ||
12095460 | 924 | static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 925 | { |
db49d2df JK |
926 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
927 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
928 | dquot->dq_dqb.dqb_curinodes -= number; |
929 | else | |
930 | dquot->dq_dqb.dqb_curinodes = 0; | |
931 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
932 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
933 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
934 | } | |
935 | ||
936 | static inline void dquot_decr_space(struct dquot *dquot, qsize_t number) | |
937 | { | |
db49d2df JK |
938 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
939 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
940 | dquot->dq_dqb.dqb_curspace -= number; |
941 | else | |
942 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 943 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
944 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
945 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
946 | } | |
947 | ||
c525460e JK |
948 | static int warning_issued(struct dquot *dquot, const int warntype) |
949 | { | |
950 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
951 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
952 | ((warntype == QUOTA_NL_IHARDWARN || | |
953 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
954 | ||
955 | if (!flag) | |
956 | return 0; | |
957 | return test_and_set_bit(flag, &dquot->dq_flags); | |
958 | } | |
959 | ||
8e893469 | 960 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
961 | static int flag_print_warnings = 1; |
962 | ||
963 | static inline int need_print_warning(struct dquot *dquot) | |
964 | { | |
965 | if (!flag_print_warnings) | |
966 | return 0; | |
967 | ||
968 | switch (dquot->dq_type) { | |
969 | case USRQUOTA: | |
da9592ed | 970 | return current_fsuid() == dquot->dq_id; |
1da177e4 LT |
971 | case GRPQUOTA: |
972 | return in_group_p(dquot->dq_id); | |
973 | } | |
974 | return 0; | |
975 | } | |
976 | ||
1da177e4 | 977 | /* Print warning to user which exceeded quota */ |
c525460e | 978 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
979 | { |
980 | char *msg = NULL; | |
24ec839c | 981 | struct tty_struct *tty; |
1da177e4 | 982 | |
657d3bfa JK |
983 | if (warntype == QUOTA_NL_IHARDBELOW || |
984 | warntype == QUOTA_NL_ISOFTBELOW || | |
985 | warntype == QUOTA_NL_BHARDBELOW || | |
986 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) | |
1da177e4 LT |
987 | return; |
988 | ||
24ec839c PZ |
989 | tty = get_current_tty(); |
990 | if (!tty) | |
452a00d2 | 991 | return; |
24ec839c | 992 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 993 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 994 | tty_write_message(tty, ": warning, "); |
1da177e4 | 995 | else |
24ec839c PZ |
996 | tty_write_message(tty, ": write failed, "); |
997 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 998 | switch (warntype) { |
8e893469 | 999 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1000 | msg = " file limit reached.\r\n"; |
1001 | break; | |
8e893469 | 1002 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1003 | msg = " file quota exceeded too long.\r\n"; |
1004 | break; | |
8e893469 | 1005 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1006 | msg = " file quota exceeded.\r\n"; |
1007 | break; | |
8e893469 | 1008 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1009 | msg = " block limit reached.\r\n"; |
1010 | break; | |
8e893469 | 1011 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1012 | msg = " block quota exceeded too long.\r\n"; |
1013 | break; | |
8e893469 | 1014 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1015 | msg = " block quota exceeded.\r\n"; |
1016 | break; | |
1017 | } | |
24ec839c | 1018 | tty_write_message(tty, msg); |
452a00d2 | 1019 | tty_kref_put(tty); |
1da177e4 | 1020 | } |
8e893469 JK |
1021 | #endif |
1022 | ||
1023 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1024 | ||
8e893469 JK |
1025 | /* Netlink family structure for quota */ |
1026 | static struct genl_family quota_genl_family = { | |
1027 | .id = GENL_ID_GENERATE, | |
1028 | .hdrsize = 0, | |
1029 | .name = "VFS_DQUOT", | |
1030 | .version = 1, | |
1031 | .maxattr = QUOTA_NL_A_MAX, | |
1032 | }; | |
1033 | ||
1034 | /* Send warning to userspace about user which exceeded quota */ | |
1035 | static void send_warning(const struct dquot *dquot, const char warntype) | |
1036 | { | |
1037 | static atomic_t seq; | |
1038 | struct sk_buff *skb; | |
1039 | void *msg_head; | |
1040 | int ret; | |
22dd4837 JK |
1041 | int msg_size = 4 * nla_total_size(sizeof(u32)) + |
1042 | 2 * nla_total_size(sizeof(u64)); | |
8e893469 JK |
1043 | |
1044 | /* We have to allocate using GFP_NOFS as we are called from a | |
1045 | * filesystem performing write and thus further recursion into | |
1046 | * the fs to free some data could cause deadlocks. */ | |
22dd4837 | 1047 | skb = genlmsg_new(msg_size, GFP_NOFS); |
8e893469 JK |
1048 | if (!skb) { |
1049 | printk(KERN_ERR | |
1050 | "VFS: Not enough memory to send quota warning.\n"); | |
1051 | return; | |
1052 | } | |
1053 | msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), | |
1054 | "a_genl_family, 0, QUOTA_NL_C_WARNING); | |
1055 | if (!msg_head) { | |
1056 | printk(KERN_ERR | |
1057 | "VFS: Cannot store netlink header in quota warning.\n"); | |
1058 | goto err_out; | |
1059 | } | |
1060 | ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type); | |
1061 | if (ret) | |
1062 | goto attr_err_out; | |
1063 | ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id); | |
1064 | if (ret) | |
1065 | goto attr_err_out; | |
1066 | ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); | |
1067 | if (ret) | |
1068 | goto attr_err_out; | |
1069 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, | |
1070 | MAJOR(dquot->dq_sb->s_dev)); | |
1071 | if (ret) | |
1072 | goto attr_err_out; | |
1073 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, | |
1074 | MINOR(dquot->dq_sb->s_dev)); | |
1075 | if (ret) | |
1076 | goto attr_err_out; | |
da9592ed | 1077 | ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid()); |
8e893469 JK |
1078 | if (ret) |
1079 | goto attr_err_out; | |
1080 | genlmsg_end(skb, msg_head); | |
1081 | ||
1082 | ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); | |
1083 | if (ret < 0 && ret != -ESRCH) | |
1084 | printk(KERN_ERR | |
1085 | "VFS: Failed to send notification message: %d\n", ret); | |
1086 | return; | |
1087 | attr_err_out: | |
22dd4837 | 1088 | printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); |
8e893469 JK |
1089 | err_out: |
1090 | kfree_skb(skb); | |
1091 | } | |
1092 | #endif | |
f18df228 MC |
1093 | /* |
1094 | * Write warnings to the console and send warning messages over netlink. | |
1095 | * | |
1096 | * Note that this function can sleep. | |
1097 | */ | |
087ee8d5 | 1098 | static inline void flush_warnings(struct dquot * const *dquots, char *warntype) |
1da177e4 LT |
1099 | { |
1100 | int i; | |
1101 | ||
1102 | for (i = 0; i < MAXQUOTAS; i++) | |
c525460e JK |
1103 | if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN && |
1104 | !warning_issued(dquots[i], warntype[i])) { | |
8e893469 | 1105 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 1106 | print_warning(dquots[i], warntype[i]); |
8e893469 JK |
1107 | #endif |
1108 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1109 | send_warning(dquots[i], warntype[i]); | |
1110 | #endif | |
1111 | } | |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | static inline char ignore_hardlimit(struct dquot *dquot) | |
1115 | { | |
1116 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1117 | ||
1118 | return capable(CAP_SYS_RESOURCE) && | |
1119 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1120 | } | |
1121 | ||
1122 | /* needs dq_data_lock */ | |
12095460 | 1123 | static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) |
1da177e4 | 1124 | { |
8e893469 | 1125 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1126 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1127 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1128 | return QUOTA_OK; |
1129 | ||
1130 | if (dquot->dq_dqb.dqb_ihardlimit && | |
1131 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit && | |
1132 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1133 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1134 | return NO_QUOTA; |
1135 | } | |
1136 | ||
1137 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1138 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1139 | dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1140 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1141 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1142 | return NO_QUOTA; |
1143 | } | |
1144 | ||
1145 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1146 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1147 | dquot->dq_dqb.dqb_itime == 0) { | |
8e893469 | 1148 | *warntype = QUOTA_NL_ISOFTWARN; |
1da177e4 LT |
1149 | dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; |
1150 | } | |
1151 | ||
1152 | return QUOTA_OK; | |
1153 | } | |
1154 | ||
1155 | /* needs dq_data_lock */ | |
1156 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1157 | { | |
f18df228 MC |
1158 | qsize_t tspace; |
1159 | ||
8e893469 | 1160 | *warntype = QUOTA_NL_NOWARN; |
f55abc0f JK |
1161 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || |
1162 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) | |
1da177e4 LT |
1163 | return QUOTA_OK; |
1164 | ||
f18df228 MC |
1165 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1166 | + space; | |
1167 | ||
1da177e4 | 1168 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1169 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1170 | !ignore_hardlimit(dquot)) { |
1171 | if (!prealloc) | |
8e893469 | 1172 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1173 | return NO_QUOTA; |
1174 | } | |
1175 | ||
1176 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1177 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1178 | dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime && |
1179 | !ignore_hardlimit(dquot)) { | |
1180 | if (!prealloc) | |
8e893469 | 1181 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1182 | return NO_QUOTA; |
1183 | } | |
1184 | ||
1185 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1186 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1187 | dquot->dq_dqb.dqb_btime == 0) { |
1188 | if (!prealloc) { | |
8e893469 | 1189 | *warntype = QUOTA_NL_BSOFTWARN; |
1da177e4 LT |
1190 | dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace; |
1191 | } | |
1192 | else | |
1193 | /* | |
1194 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1195 | * be always printed | |
1196 | */ | |
1197 | return NO_QUOTA; | |
1198 | } | |
1199 | ||
1200 | return QUOTA_OK; | |
1201 | } | |
1202 | ||
12095460 | 1203 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa JK |
1204 | { |
1205 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
f55abc0f JK |
1206 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
1207 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) | |
657d3bfa JK |
1208 | return QUOTA_NL_NOWARN; |
1209 | ||
1210 | if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1211 | return QUOTA_NL_ISOFTBELOW; | |
1212 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
1213 | dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit) | |
1214 | return QUOTA_NL_IHARDBELOW; | |
1215 | return QUOTA_NL_NOWARN; | |
1216 | } | |
1217 | ||
1218 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1219 | { | |
1220 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1221 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1222 | return QUOTA_NL_NOWARN; |
1223 | ||
12095460 | 1224 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1225 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1226 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1227 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1228 | return QUOTA_NL_BHARDBELOW; |
1229 | return QUOTA_NL_NOWARN; | |
1230 | } | |
1da177e4 LT |
1231 | /* |
1232 | * Initialize quota pointers in inode | |
cc33412f JK |
1233 | * We do things in a bit complicated way but by that we avoid calling |
1234 | * dqget() and thus filesystem callbacks under dqptr_sem. | |
1da177e4 LT |
1235 | */ |
1236 | int dquot_initialize(struct inode *inode, int type) | |
1237 | { | |
1238 | unsigned int id = 0; | |
1239 | int cnt, ret = 0; | |
cc33412f JK |
1240 | struct dquot *got[MAXQUOTAS] = { NODQUOT, NODQUOT }; |
1241 | struct super_block *sb = inode->i_sb; | |
1da177e4 | 1242 | |
d3be915f IM |
1243 | /* First test before acquiring mutex - solves deadlocks when we |
1244 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1245 | if (IS_NOQUOTA(inode)) |
1246 | return 0; | |
cc33412f JK |
1247 | |
1248 | /* First get references to structures we might need. */ | |
1249 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1250 | if (type != -1 && cnt != type) | |
1251 | continue; | |
1252 | switch (cnt) { | |
1253 | case USRQUOTA: | |
1254 | id = inode->i_uid; | |
1255 | break; | |
1256 | case GRPQUOTA: | |
1257 | id = inode->i_gid; | |
1258 | break; | |
1259 | } | |
1260 | got[cnt] = dqget(sb, id, cnt); | |
1261 | } | |
1262 | ||
1263 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
1da177e4 LT |
1264 | /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ |
1265 | if (IS_NOQUOTA(inode)) | |
1266 | goto out_err; | |
1267 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1268 | if (type != -1 && cnt != type) | |
1269 | continue; | |
cc33412f JK |
1270 | /* Avoid races with quotaoff() */ |
1271 | if (!sb_has_quota_active(sb, cnt)) | |
1272 | continue; | |
1da177e4 | 1273 | if (inode->i_dquot[cnt] == NODQUOT) { |
cc33412f JK |
1274 | inode->i_dquot[cnt] = got[cnt]; |
1275 | got[cnt] = NODQUOT; | |
1da177e4 LT |
1276 | } |
1277 | } | |
1278 | out_err: | |
cc33412f JK |
1279 | up_write(&sb_dqopt(sb)->dqptr_sem); |
1280 | /* Drop unused references */ | |
1281 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1282 | dqput(got[cnt]); | |
1da177e4 LT |
1283 | return ret; |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Release all quotas referenced by inode | |
1da177e4 | 1288 | */ |
cc33412f | 1289 | int dquot_drop(struct inode *inode) |
1da177e4 LT |
1290 | { |
1291 | int cnt; | |
cc33412f | 1292 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1293 | |
cc33412f | 1294 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1da177e4 | 1295 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1296 | put[cnt] = inode->i_dquot[cnt]; |
1297 | inode->i_dquot[cnt] = NODQUOT; | |
1da177e4 LT |
1298 | } |
1299 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
cc33412f JK |
1300 | |
1301 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1302 | dqput(put[cnt]); | |
1da177e4 LT |
1303 | return 0; |
1304 | } | |
1305 | ||
b85f4b87 JK |
1306 | /* Wrapper to remove references to quota structures from inode */ |
1307 | void vfs_dq_drop(struct inode *inode) | |
1308 | { | |
1309 | /* Here we can get arbitrary inode from clear_inode() so we have | |
1310 | * to be careful. OTOH we don't need locking as quota operations | |
1311 | * are allowed to change only at mount time */ | |
1312 | if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op | |
1313 | && inode->i_sb->dq_op->drop) { | |
1314 | int cnt; | |
1315 | /* Test before calling to rule out calls from proc and such | |
1316 | * where we are not allowed to block. Note that this is | |
1317 | * actually reliable test even without the lock - the caller | |
1318 | * must assure that nobody can come after the DQUOT_DROP and | |
1319 | * add quota pointers back anyway */ | |
1320 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1321 | if (inode->i_dquot[cnt] != NODQUOT) | |
1322 | break; | |
1323 | if (cnt < MAXQUOTAS) | |
1324 | inode->i_sb->dq_op->drop(inode); | |
1325 | } | |
1326 | } | |
1327 | ||
1da177e4 LT |
1328 | /* |
1329 | * Following four functions update i_blocks+i_bytes fields and | |
1330 | * quota information (together with appropriate checks) | |
1331 | * NOTE: We absolutely rely on the fact that caller dirties | |
1332 | * the inode (usually macros in quotaops.h care about this) and | |
1333 | * holds a handle for the current transaction so that dquot write and | |
1334 | * inode write go into the same transaction. | |
1335 | */ | |
1336 | ||
1337 | /* | |
1338 | * This operation can block, but only after everything is updated | |
1339 | */ | |
f18df228 MC |
1340 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
1341 | int warn, int reserve) | |
1da177e4 | 1342 | { |
f18df228 | 1343 | int cnt, ret = QUOTA_OK; |
1da177e4 LT |
1344 | char warntype[MAXQUOTAS]; |
1345 | ||
1da177e4 | 1346 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
8e893469 | 1347 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 | 1348 | |
1da177e4 LT |
1349 | spin_lock(&dq_data_lock); |
1350 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1351 | if (inode->i_dquot[cnt] == NODQUOT) | |
1352 | continue; | |
f18df228 MC |
1353 | if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) |
1354 | == NO_QUOTA) { | |
1355 | ret = NO_QUOTA; | |
1356 | goto out_unlock; | |
1357 | } | |
1da177e4 LT |
1358 | } |
1359 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1360 | if (inode->i_dquot[cnt] == NODQUOT) | |
1361 | continue; | |
f18df228 MC |
1362 | if (reserve) |
1363 | dquot_resv_space(inode->i_dquot[cnt], number); | |
1364 | else | |
1365 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1da177e4 | 1366 | } |
f18df228 MC |
1367 | if (!reserve) |
1368 | inode_add_bytes(inode, number); | |
1369 | out_unlock: | |
1da177e4 | 1370 | spin_unlock(&dq_data_lock); |
1da177e4 | 1371 | flush_warnings(inode->i_dquot, warntype); |
f18df228 MC |
1372 | return ret; |
1373 | } | |
1374 | ||
1375 | int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) | |
1376 | { | |
1377 | int cnt, ret = QUOTA_OK; | |
1378 | ||
1379 | /* | |
1380 | * First test before acquiring mutex - solves deadlocks when we | |
1381 | * re-enter the quota code and are already holding the mutex | |
1382 | */ | |
1383 | if (IS_NOQUOTA(inode)) { | |
1384 | inode_add_bytes(inode, number); | |
1385 | goto out; | |
1386 | } | |
1387 | ||
1388 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1389 | if (IS_NOQUOTA(inode)) { | |
1390 | inode_add_bytes(inode, number); | |
1391 | goto out_unlock; | |
1392 | } | |
1393 | ||
1394 | ret = __dquot_alloc_space(inode, number, warn, 0); | |
1395 | if (ret == NO_QUOTA) | |
1396 | goto out_unlock; | |
1397 | ||
1398 | /* Dirtify all the dquots - this can block when journalling */ | |
1399 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1400 | if (inode->i_dquot[cnt]) | |
1401 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1402 | out_unlock: | |
1da177e4 | 1403 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
f18df228 MC |
1404 | out: |
1405 | return ret; | |
1406 | } | |
1407 | ||
1408 | int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) | |
1409 | { | |
1410 | int ret = QUOTA_OK; | |
1411 | ||
1412 | if (IS_NOQUOTA(inode)) | |
1413 | goto out; | |
1414 | ||
1415 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1416 | if (IS_NOQUOTA(inode)) | |
1417 | goto out_unlock; | |
1418 | ||
1419 | ret = __dquot_alloc_space(inode, number, warn, 1); | |
1420 | out_unlock: | |
1421 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1422 | out: | |
1da177e4 LT |
1423 | return ret; |
1424 | } | |
f18df228 | 1425 | EXPORT_SYMBOL(dquot_reserve_space); |
1da177e4 LT |
1426 | |
1427 | /* | |
1428 | * This operation can block, but only after everything is updated | |
1429 | */ | |
12095460 | 1430 | int dquot_alloc_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1431 | { |
1432 | int cnt, ret = NO_QUOTA; | |
1433 | char warntype[MAXQUOTAS]; | |
1434 | ||
d3be915f IM |
1435 | /* First test before acquiring mutex - solves deadlocks when we |
1436 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1437 | if (IS_NOQUOTA(inode)) |
1438 | return QUOTA_OK; | |
1439 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1440 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1441 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1442 | if (IS_NOQUOTA(inode)) { | |
1443 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1444 | return QUOTA_OK; | |
1445 | } | |
1446 | spin_lock(&dq_data_lock); | |
1447 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1448 | if (inode->i_dquot[cnt] == NODQUOT) | |
1449 | continue; | |
1450 | if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA) | |
1451 | goto warn_put_all; | |
1452 | } | |
1453 | ||
1454 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1455 | if (inode->i_dquot[cnt] == NODQUOT) | |
1456 | continue; | |
1457 | dquot_incr_inodes(inode->i_dquot[cnt], number); | |
1458 | } | |
1459 | ret = QUOTA_OK; | |
1460 | warn_put_all: | |
1461 | spin_unlock(&dq_data_lock); | |
1462 | if (ret == QUOTA_OK) | |
1463 | /* Dirtify all the dquots - this can block when journalling */ | |
1464 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1465 | if (inode->i_dquot[cnt]) | |
1466 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
087ee8d5 | 1467 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1468 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1469 | return ret; | |
1470 | } | |
1471 | ||
740d9dcd MC |
1472 | int dquot_claim_space(struct inode *inode, qsize_t number) |
1473 | { | |
1474 | int cnt; | |
1475 | int ret = QUOTA_OK; | |
1476 | ||
1477 | if (IS_NOQUOTA(inode)) { | |
1478 | inode_add_bytes(inode, number); | |
1479 | goto out; | |
1480 | } | |
1481 | ||
1482 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1483 | if (IS_NOQUOTA(inode)) { | |
1484 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1485 | inode_add_bytes(inode, number); | |
1486 | goto out; | |
1487 | } | |
1488 | ||
1489 | spin_lock(&dq_data_lock); | |
1490 | /* Claim reserved quotas to allocated quotas */ | |
1491 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1492 | if (inode->i_dquot[cnt] != NODQUOT) | |
1493 | dquot_claim_reserved_space(inode->i_dquot[cnt], | |
1494 | number); | |
1495 | } | |
1496 | /* Update inode bytes */ | |
1497 | inode_add_bytes(inode, number); | |
1498 | spin_unlock(&dq_data_lock); | |
1499 | /* Dirtify all the dquots - this can block when journalling */ | |
1500 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1501 | if (inode->i_dquot[cnt]) | |
1502 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1503 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1504 | out: | |
1505 | return ret; | |
1506 | } | |
1507 | EXPORT_SYMBOL(dquot_claim_space); | |
1508 | ||
1509 | /* | |
1510 | * Release reserved quota space | |
1511 | */ | |
1512 | void dquot_release_reserved_space(struct inode *inode, qsize_t number) | |
1513 | { | |
1514 | int cnt; | |
1515 | ||
1516 | if (IS_NOQUOTA(inode)) | |
1517 | goto out; | |
1518 | ||
1519 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1520 | if (IS_NOQUOTA(inode)) | |
1521 | goto out_unlock; | |
1522 | ||
1523 | spin_lock(&dq_data_lock); | |
1524 | /* Release reserved dquots */ | |
1525 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1526 | if (inode->i_dquot[cnt] != NODQUOT) | |
1527 | dquot_free_reserved_space(inode->i_dquot[cnt], number); | |
1528 | } | |
1529 | spin_unlock(&dq_data_lock); | |
1530 | ||
1531 | out_unlock: | |
1532 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1533 | out: | |
1534 | return; | |
1535 | } | |
1536 | EXPORT_SYMBOL(dquot_release_reserved_space); | |
1537 | ||
1da177e4 LT |
1538 | /* |
1539 | * This operation can block, but only after everything is updated | |
1540 | */ | |
1541 | int dquot_free_space(struct inode *inode, qsize_t number) | |
1542 | { | |
1543 | unsigned int cnt; | |
657d3bfa | 1544 | char warntype[MAXQUOTAS]; |
1da177e4 | 1545 | |
d3be915f IM |
1546 | /* First test before acquiring mutex - solves deadlocks when we |
1547 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1548 | if (IS_NOQUOTA(inode)) { |
1549 | out_sub: | |
1550 | inode_sub_bytes(inode, number); | |
1551 | return QUOTA_OK; | |
1552 | } | |
657d3bfa | 1553 | |
1da177e4 LT |
1554 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1555 | /* Now recheck reliably when holding dqptr_sem */ | |
1556 | if (IS_NOQUOTA(inode)) { | |
1557 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1558 | goto out_sub; | |
1559 | } | |
1560 | spin_lock(&dq_data_lock); | |
1561 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1562 | if (inode->i_dquot[cnt] == NODQUOT) | |
1563 | continue; | |
657d3bfa | 1564 | warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1565 | dquot_decr_space(inode->i_dquot[cnt], number); |
1566 | } | |
1567 | inode_sub_bytes(inode, number); | |
1568 | spin_unlock(&dq_data_lock); | |
1569 | /* Dirtify all the dquots - this can block when journalling */ | |
1570 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1571 | if (inode->i_dquot[cnt]) | |
1572 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
657d3bfa | 1573 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1574 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1575 | return QUOTA_OK; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * This operation can block, but only after everything is updated | |
1580 | */ | |
12095460 | 1581 | int dquot_free_inode(const struct inode *inode, qsize_t number) |
1da177e4 LT |
1582 | { |
1583 | unsigned int cnt; | |
657d3bfa | 1584 | char warntype[MAXQUOTAS]; |
1da177e4 | 1585 | |
d3be915f IM |
1586 | /* First test before acquiring mutex - solves deadlocks when we |
1587 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1588 | if (IS_NOQUOTA(inode)) |
1589 | return QUOTA_OK; | |
657d3bfa | 1590 | |
1da177e4 LT |
1591 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1592 | /* Now recheck reliably when holding dqptr_sem */ | |
1593 | if (IS_NOQUOTA(inode)) { | |
1594 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1595 | return QUOTA_OK; | |
1596 | } | |
1597 | spin_lock(&dq_data_lock); | |
1598 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1599 | if (inode->i_dquot[cnt] == NODQUOT) | |
1600 | continue; | |
657d3bfa | 1601 | warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); |
1da177e4 LT |
1602 | dquot_decr_inodes(inode->i_dquot[cnt], number); |
1603 | } | |
1604 | spin_unlock(&dq_data_lock); | |
1605 | /* Dirtify all the dquots - this can block when journalling */ | |
1606 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1607 | if (inode->i_dquot[cnt]) | |
1608 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
657d3bfa | 1609 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1610 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1611 | return QUOTA_OK; | |
1612 | } | |
1613 | ||
740d9dcd MC |
1614 | /* |
1615 | * call back function, get reserved quota space from underlying fs | |
1616 | */ | |
1617 | qsize_t dquot_get_reserved_space(struct inode *inode) | |
1618 | { | |
1619 | qsize_t reserved_space = 0; | |
1620 | ||
1621 | if (sb_any_quota_active(inode->i_sb) && | |
1622 | inode->i_sb->dq_op->get_reserved_space) | |
1623 | reserved_space = inode->i_sb->dq_op->get_reserved_space(inode); | |
1624 | return reserved_space; | |
1625 | } | |
1626 | ||
1da177e4 LT |
1627 | /* |
1628 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1629 | * | |
1630 | * This operation can block, but only after everything is updated | |
1631 | * A transaction must be started when entering this function. | |
1632 | */ | |
1633 | int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
1634 | { | |
740d9dcd MC |
1635 | qsize_t space, cur_space; |
1636 | qsize_t rsv_space = 0; | |
1da177e4 LT |
1637 | struct dquot *transfer_from[MAXQUOTAS]; |
1638 | struct dquot *transfer_to[MAXQUOTAS]; | |
cc33412f JK |
1639 | int cnt, ret = QUOTA_OK; |
1640 | int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, | |
1641 | chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; | |
657d3bfa JK |
1642 | char warntype_to[MAXQUOTAS]; |
1643 | char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; | |
1da177e4 | 1644 | |
d3be915f IM |
1645 | /* First test before acquiring mutex - solves deadlocks when we |
1646 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1647 | if (IS_NOQUOTA(inode)) |
1648 | return QUOTA_OK; | |
cc33412f | 1649 | /* Initialize the arrays */ |
1da177e4 | 1650 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1651 | transfer_from[cnt] = NODQUOT; |
1652 | transfer_to[cnt] = NODQUOT; | |
657d3bfa | 1653 | warntype_to[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1654 | switch (cnt) { |
1655 | case USRQUOTA: | |
1656 | if (!chuid) | |
1657 | continue; | |
1658 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt); | |
1659 | break; | |
1660 | case GRPQUOTA: | |
1661 | if (!chgid) | |
1662 | continue; | |
1663 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt); | |
1664 | break; | |
1665 | } | |
1666 | } | |
cc33412f JK |
1667 | |
1668 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1669 | /* Now recheck reliably when holding dqptr_sem */ | |
1670 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ | |
1671 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1672 | goto put_all; | |
1673 | } | |
1da177e4 | 1674 | spin_lock(&dq_data_lock); |
740d9dcd MC |
1675 | cur_space = inode_get_bytes(inode); |
1676 | rsv_space = dquot_get_reserved_space(inode); | |
1677 | space = cur_space + rsv_space; | |
1da177e4 LT |
1678 | /* Build the transfer_from list and check the limits */ |
1679 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1680 | if (transfer_to[cnt] == NODQUOT) | |
1681 | continue; | |
1682 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
657d3bfa JK |
1683 | if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == |
1684 | NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, | |
1685 | warntype_to + cnt) == NO_QUOTA) | |
cc33412f | 1686 | goto over_quota; |
1da177e4 LT |
1687 | } |
1688 | ||
1689 | /* | |
1690 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1691 | */ | |
1692 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1693 | /* | |
1694 | * Skip changes for same uid or gid or for turned off quota-type. | |
1695 | */ | |
1696 | if (transfer_to[cnt] == NODQUOT) | |
1697 | continue; | |
1698 | ||
1699 | /* Due to IO error we might not have transfer_from[] structure */ | |
1700 | if (transfer_from[cnt]) { | |
657d3bfa JK |
1701 | warntype_from_inodes[cnt] = |
1702 | info_idq_free(transfer_from[cnt], 1); | |
1703 | warntype_from_space[cnt] = | |
1704 | info_bdq_free(transfer_from[cnt], space); | |
1da177e4 | 1705 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1706 | dquot_decr_space(transfer_from[cnt], cur_space); |
1707 | dquot_free_reserved_space(transfer_from[cnt], | |
1708 | rsv_space); | |
1da177e4 LT |
1709 | } |
1710 | ||
1711 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1712 | dquot_incr_space(transfer_to[cnt], cur_space); |
1713 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 LT |
1714 | |
1715 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1716 | } | |
1da177e4 | 1717 | spin_unlock(&dq_data_lock); |
cc33412f JK |
1718 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1719 | ||
1da177e4 LT |
1720 | /* Dirtify all the dquots - this can block when journalling */ |
1721 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1722 | if (transfer_from[cnt]) | |
1723 | mark_dquot_dirty(transfer_from[cnt]); | |
cc33412f | 1724 | if (transfer_to[cnt]) { |
1da177e4 | 1725 | mark_dquot_dirty(transfer_to[cnt]); |
cc33412f JK |
1726 | /* The reference we got is transferred to the inode */ |
1727 | transfer_to[cnt] = NODQUOT; | |
1728 | } | |
1da177e4 | 1729 | } |
cc33412f | 1730 | warn_put_all: |
657d3bfa JK |
1731 | flush_warnings(transfer_to, warntype_to); |
1732 | flush_warnings(transfer_from, warntype_from_inodes); | |
1733 | flush_warnings(transfer_from, warntype_from_space); | |
cc33412f | 1734 | put_all: |
1da177e4 | 1735 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
cc33412f JK |
1736 | dqput(transfer_from[cnt]); |
1737 | dqput(transfer_to[cnt]); | |
1da177e4 | 1738 | } |
1da177e4 | 1739 | return ret; |
cc33412f JK |
1740 | over_quota: |
1741 | spin_unlock(&dq_data_lock); | |
1742 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1743 | /* Clear dquot pointers we don't want to dqput() */ | |
1744 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1745 | transfer_from[cnt] = NODQUOT; | |
1746 | ret = NO_QUOTA; | |
1747 | goto warn_put_all; | |
1da177e4 LT |
1748 | } |
1749 | ||
b85f4b87 JK |
1750 | /* Wrapper for transferring ownership of an inode */ |
1751 | int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) | |
1752 | { | |
f55abc0f | 1753 | if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { |
b85f4b87 JK |
1754 | vfs_dq_init(inode); |
1755 | if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) | |
1756 | return 1; | |
1757 | } | |
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | ||
1da177e4 LT |
1762 | /* |
1763 | * Write info of quota file to disk | |
1764 | */ | |
1765 | int dquot_commit_info(struct super_block *sb, int type) | |
1766 | { | |
1767 | int ret; | |
1768 | struct quota_info *dqopt = sb_dqopt(sb); | |
1769 | ||
d3be915f | 1770 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1771 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1772 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1773 | return ret; |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * Definitions of diskquota operations. | |
1778 | */ | |
1779 | struct dquot_operations dquot_operations = { | |
1780 | .initialize = dquot_initialize, | |
1781 | .drop = dquot_drop, | |
1782 | .alloc_space = dquot_alloc_space, | |
1783 | .alloc_inode = dquot_alloc_inode, | |
1784 | .free_space = dquot_free_space, | |
1785 | .free_inode = dquot_free_inode, | |
1786 | .transfer = dquot_transfer, | |
1787 | .write_dquot = dquot_commit, | |
1788 | .acquire_dquot = dquot_acquire, | |
1789 | .release_dquot = dquot_release, | |
1790 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1791 | .write_info = dquot_commit_info, |
1792 | .alloc_dquot = dquot_alloc, | |
1793 | .destroy_dquot = dquot_destroy, | |
1da177e4 LT |
1794 | }; |
1795 | ||
1da177e4 LT |
1796 | /* |
1797 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1798 | */ | |
f55abc0f | 1799 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 1800 | { |
0ff5af83 | 1801 | int cnt, ret = 0; |
1da177e4 LT |
1802 | struct quota_info *dqopt = sb_dqopt(sb); |
1803 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 1804 | |
f55abc0f JK |
1805 | /* Cannot turn off usage accounting without turning off limits, or |
1806 | * suspend quotas and simultaneously turn quotas off. */ | |
1807 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
1808 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
1809 | DQUOT_USAGE_ENABLED))) | |
1810 | return -EINVAL; | |
1811 | ||
1da177e4 | 1812 | /* We need to serialize quota_off() for device */ |
d3be915f | 1813 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1814 | |
1815 | /* | |
1816 | * Skip everything if there's nothing to do. We have to do this because | |
1817 | * sometimes we are called when fill_super() failed and calling | |
1818 | * sync_fs() in such cases does no good. | |
1819 | */ | |
f55abc0f | 1820 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
1821 | mutex_unlock(&dqopt->dqonoff_mutex); |
1822 | return 0; | |
1823 | } | |
1da177e4 LT |
1824 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1825 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1826 | if (type != -1 && cnt != type) |
1827 | continue; | |
f55abc0f | 1828 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1829 | continue; |
f55abc0f JK |
1830 | |
1831 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 1832 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1833 | dqopt->flags |= |
1834 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 1835 | spin_unlock(&dq_state_lock); |
f55abc0f | 1836 | } else { |
cc33412f | 1837 | spin_lock(&dq_state_lock); |
f55abc0f JK |
1838 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
1839 | /* Turning off suspended quotas? */ | |
1840 | if (!sb_has_quota_loaded(sb, cnt) && | |
1841 | sb_has_quota_suspended(sb, cnt)) { | |
1842 | dqopt->flags &= ~dquot_state_flag( | |
1843 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 1844 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
1845 | iput(dqopt->files[cnt]); |
1846 | dqopt->files[cnt] = NULL; | |
1847 | continue; | |
1848 | } | |
cc33412f | 1849 | spin_unlock(&dq_state_lock); |
0ff5af83 | 1850 | } |
f55abc0f JK |
1851 | |
1852 | /* We still have to keep quota loaded? */ | |
1853 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 1854 | continue; |
1da177e4 LT |
1855 | |
1856 | /* Note: these are blocking operations */ | |
1857 | drop_dquot_ref(sb, cnt); | |
1858 | invalidate_dquots(sb, cnt); | |
1859 | /* | |
1860 | * Now all dquots should be invalidated, all writes done so we should be only | |
1861 | * users of the info. No locks needed. | |
1862 | */ | |
1863 | if (info_dirty(&dqopt->info[cnt])) | |
1864 | sb->dq_op->write_info(sb, cnt); | |
1865 | if (dqopt->ops[cnt]->free_file_info) | |
1866 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1867 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1868 | ||
1869 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 1870 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 1871 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
1872 | dqopt->info[cnt].dqi_flags = 0; |
1873 | dqopt->info[cnt].dqi_igrace = 0; | |
1874 | dqopt->info[cnt].dqi_bgrace = 0; | |
1875 | dqopt->ops[cnt] = NULL; | |
1876 | } | |
d3be915f | 1877 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1878 | |
1879 | /* Skip syncing and setting flags if quota files are hidden */ | |
1880 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
1881 | goto put_inodes; | |
1882 | ||
1da177e4 | 1883 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1884 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1885 | if (sb->s_op->sync_fs) |
1886 | sb->s_op->sync_fs(sb, 1); | |
1887 | sync_blockdev(sb->s_bdev); | |
1888 | /* Now the quota files are just ordinary files and we can set the | |
1889 | * inode flags back. Moreover we discard the pagecache so that | |
1890 | * userspace sees the writes we did bypassing the pagecache. We | |
1891 | * must also discard the blockdev buffers so that we see the | |
1892 | * changes done by userspace on the next quotaon() */ | |
1893 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1894 | if (toputinode[cnt]) { | |
d3be915f | 1895 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1896 | /* If quota was reenabled in the meantime, we have |
1897 | * nothing to do */ | |
f55abc0f | 1898 | if (!sb_has_quota_loaded(sb, cnt)) { |
7925409e | 1899 | mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1900 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1901 | S_NOATIME | S_NOQUOTA); | |
1902 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); | |
1b1dcc1b | 1903 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1904 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1905 | } |
d3be915f | 1906 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
1907 | } |
1908 | if (sb->s_bdev) | |
1909 | invalidate_bdev(sb->s_bdev); | |
1910 | put_inodes: | |
1911 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1912 | if (toputinode[cnt]) { | |
0ff5af83 | 1913 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
1914 | * can reenable quota on the subsequent remount RW. We |
1915 | * have to check 'flags' variable and not use sb_has_ | |
1916 | * function because another quotaon / quotaoff could | |
1917 | * change global state before we got here. We refuse | |
1918 | * to suspend quotas when there is pending delete on | |
1919 | * the quota file... */ | |
1920 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
1921 | iput(toputinode[cnt]); |
1922 | else if (!toputinode[cnt]->i_nlink) | |
1923 | ret = -EBUSY; | |
1da177e4 | 1924 | } |
0ff5af83 | 1925 | return ret; |
1da177e4 LT |
1926 | } |
1927 | ||
f55abc0f JK |
1928 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1929 | { | |
1930 | return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : | |
1931 | (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); | |
1932 | } | |
1933 | ||
1da177e4 LT |
1934 | /* |
1935 | * Turn quotas on on a device | |
1936 | */ | |
1937 | ||
f55abc0f JK |
1938 | /* |
1939 | * Helper function to turn quotas on when we already have the inode of | |
1940 | * quota file and no quota information is loaded. | |
1941 | */ | |
1942 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
1943 | unsigned int flags) | |
1da177e4 LT |
1944 | { |
1945 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1946 | struct super_block *sb = inode->i_sb; | |
1947 | struct quota_info *dqopt = sb_dqopt(sb); | |
1948 | int error; | |
1949 | int oldflags = -1; | |
1950 | ||
1951 | if (!fmt) | |
1952 | return -ESRCH; | |
1953 | if (!S_ISREG(inode->i_mode)) { | |
1954 | error = -EACCES; | |
1955 | goto out_fmt; | |
1956 | } | |
1957 | if (IS_RDONLY(inode)) { | |
1958 | error = -EROFS; | |
1959 | goto out_fmt; | |
1960 | } | |
1961 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
1962 | error = -EINVAL; | |
1963 | goto out_fmt; | |
1964 | } | |
f55abc0f JK |
1965 | /* Usage always has to be set... */ |
1966 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
1967 | error = -EINVAL; | |
1968 | goto out_fmt; | |
1969 | } | |
1da177e4 | 1970 | |
ca785ec6 JK |
1971 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
1972 | /* As we bypass the pagecache we must now flush the inode so | |
1973 | * that we see all the changes from userspace... */ | |
1974 | write_inode_now(inode, 1); | |
1975 | /* And now flush the block cache so that kernel sees the | |
1976 | * changes */ | |
1977 | invalidate_bdev(sb->s_bdev); | |
1978 | } | |
1b1dcc1b | 1979 | mutex_lock(&inode->i_mutex); |
d3be915f | 1980 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 1981 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
1982 | error = -EBUSY; |
1983 | goto out_lock; | |
1984 | } | |
ca785ec6 JK |
1985 | |
1986 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
1987 | /* We don't want quota and atime on quota files (deadlocks | |
1988 | * possible) Also nobody should write to the file - we use | |
1989 | * special IO operations which ignore the immutable bit. */ | |
1990 | down_write(&dqopt->dqptr_sem); | |
1991 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA); | |
1992 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; | |
1993 | up_write(&dqopt->dqptr_sem); | |
1994 | sb->dq_op->drop(inode); | |
1995 | } | |
1da177e4 LT |
1996 | |
1997 | error = -EIO; | |
1998 | dqopt->files[type] = igrab(inode); | |
1999 | if (!dqopt->files[type]) | |
2000 | goto out_lock; | |
2001 | error = -EINVAL; | |
2002 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2003 | goto out_file_init; | |
2004 | ||
2005 | dqopt->ops[type] = fmt->qf_ops; | |
2006 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2007 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2008 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2009 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 2010 | if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) { |
d3be915f | 2011 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2012 | goto out_file_init; |
2013 | } | |
d3be915f | 2014 | mutex_unlock(&dqopt->dqio_mutex); |
1b1dcc1b | 2015 | mutex_unlock(&inode->i_mutex); |
cc33412f | 2016 | spin_lock(&dq_state_lock); |
f55abc0f | 2017 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2018 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2019 | |
2020 | add_dquot_ref(sb, type); | |
d3be915f | 2021 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2022 | |
2023 | return 0; | |
2024 | ||
2025 | out_file_init: | |
2026 | dqopt->files[type] = NULL; | |
2027 | iput(inode); | |
2028 | out_lock: | |
d3be915f | 2029 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2030 | if (oldflags != -1) { |
2031 | down_write(&dqopt->dqptr_sem); | |
2032 | /* Set the flags back (in the case of accidental quotaon() | |
2033 | * on a wrong file we don't want to mess up the flags) */ | |
2034 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2035 | inode->i_flags |= oldflags; | |
2036 | up_write(&dqopt->dqptr_sem); | |
2037 | } | |
1b1dcc1b | 2038 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2039 | out_fmt: |
2040 | put_quota_format(fmt); | |
2041 | ||
2042 | return error; | |
2043 | } | |
2044 | ||
0ff5af83 JK |
2045 | /* Reenable quotas on remount RW */ |
2046 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
2047 | { | |
2048 | struct quota_info *dqopt = sb_dqopt(sb); | |
2049 | struct inode *inode; | |
2050 | int ret; | |
f55abc0f | 2051 | unsigned int flags; |
0ff5af83 JK |
2052 | |
2053 | mutex_lock(&dqopt->dqonoff_mutex); | |
2054 | if (!sb_has_quota_suspended(sb, type)) { | |
2055 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2056 | return 0; | |
2057 | } | |
0ff5af83 JK |
2058 | inode = dqopt->files[type]; |
2059 | dqopt->files[type] = NULL; | |
cc33412f | 2060 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2061 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | |
2062 | DQUOT_LIMITS_ENABLED, type); | |
2063 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); | |
cc33412f | 2064 | spin_unlock(&dq_state_lock); |
0ff5af83 JK |
2065 | mutex_unlock(&dqopt->dqonoff_mutex); |
2066 | ||
f55abc0f JK |
2067 | flags = dquot_generic_flag(flags, type); |
2068 | ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, | |
2069 | flags); | |
0ff5af83 JK |
2070 | iput(inode); |
2071 | ||
2072 | return ret; | |
2073 | } | |
2074 | ||
77e69dac AV |
2075 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
2076 | struct path *path) | |
2077 | { | |
2078 | int error = security_quota_on(path->dentry); | |
2079 | if (error) | |
2080 | return error; | |
2081 | /* Quota file not on the same filesystem? */ | |
2082 | if (path->mnt->mnt_sb != sb) | |
2083 | error = -EXDEV; | |
2084 | else | |
f55abc0f JK |
2085 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2086 | format_id, DQUOT_USAGE_ENABLED | | |
2087 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2088 | return error; |
2089 | } | |
2090 | ||
8264613d | 2091 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, |
0ff5af83 | 2092 | int remount) |
1da177e4 | 2093 | { |
8264613d | 2094 | struct path path; |
1da177e4 LT |
2095 | int error; |
2096 | ||
0ff5af83 JK |
2097 | if (remount) |
2098 | return vfs_quota_on_remount(sb, type); | |
2099 | ||
8264613d | 2100 | error = kern_path(name, LOOKUP_FOLLOW, &path); |
77e69dac | 2101 | if (!error) { |
8264613d AV |
2102 | error = vfs_quota_on_path(sb, type, format_id, &path); |
2103 | path_put(&path); | |
77e69dac | 2104 | } |
1da177e4 LT |
2105 | return error; |
2106 | } | |
2107 | ||
f55abc0f JK |
2108 | /* |
2109 | * More powerful function for turning on quotas allowing setting | |
2110 | * of individual quota flags | |
2111 | */ | |
2112 | int vfs_quota_enable(struct inode *inode, int type, int format_id, | |
2113 | unsigned int flags) | |
2114 | { | |
2115 | int ret = 0; | |
2116 | struct super_block *sb = inode->i_sb; | |
2117 | struct quota_info *dqopt = sb_dqopt(sb); | |
2118 | ||
2119 | /* Just unsuspend quotas? */ | |
2120 | if (flags & DQUOT_SUSPENDED) | |
2121 | return vfs_quota_on_remount(sb, type); | |
2122 | if (!flags) | |
2123 | return 0; | |
2124 | /* Just updating flags needed? */ | |
2125 | if (sb_has_quota_loaded(sb, type)) { | |
2126 | mutex_lock(&dqopt->dqonoff_mutex); | |
2127 | /* Now do a reliable test... */ | |
2128 | if (!sb_has_quota_loaded(sb, type)) { | |
2129 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2130 | goto load_quota; | |
2131 | } | |
2132 | if (flags & DQUOT_USAGE_ENABLED && | |
2133 | sb_has_quota_usage_enabled(sb, type)) { | |
2134 | ret = -EBUSY; | |
2135 | goto out_lock; | |
2136 | } | |
2137 | if (flags & DQUOT_LIMITS_ENABLED && | |
2138 | sb_has_quota_limits_enabled(sb, type)) { | |
2139 | ret = -EBUSY; | |
2140 | goto out_lock; | |
2141 | } | |
cc33412f | 2142 | spin_lock(&dq_state_lock); |
f55abc0f | 2143 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2144 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2145 | out_lock: |
2146 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2147 | return ret; | |
2148 | } | |
2149 | ||
2150 | load_quota: | |
2151 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2152 | } | |
2153 | ||
1da177e4 LT |
2154 | /* |
2155 | * This function is used when filesystem needs to initialize quotas | |
2156 | * during mount time. | |
2157 | */ | |
84de856e CH |
2158 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
2159 | int format_id, int type) | |
1da177e4 | 2160 | { |
84de856e | 2161 | struct dentry *dentry; |
1da177e4 LT |
2162 | int error; |
2163 | ||
2fa389c5 | 2164 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2165 | if (IS_ERR(dentry)) |
2166 | return PTR_ERR(dentry); | |
2167 | ||
154f484b JK |
2168 | if (!dentry->d_inode) { |
2169 | error = -ENOENT; | |
2170 | goto out; | |
2171 | } | |
2172 | ||
1da177e4 | 2173 | error = security_quota_on(dentry); |
84de856e | 2174 | if (!error) |
f55abc0f JK |
2175 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2176 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2177 | |
154f484b | 2178 | out: |
84de856e CH |
2179 | dput(dentry); |
2180 | return error; | |
1da177e4 LT |
2181 | } |
2182 | ||
b85f4b87 JK |
2183 | /* Wrapper to turn on quotas when remounting rw */ |
2184 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
2185 | { | |
2186 | int cnt; | |
2187 | int ret = 0, err; | |
2188 | ||
2189 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
2190 | return -ENOSYS; | |
2191 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2192 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
2193 | if (err < 0 && !ret) | |
2194 | ret = err; | |
2195 | } | |
2196 | return ret; | |
2197 | } | |
2198 | ||
12095460 JK |
2199 | static inline qsize_t qbtos(qsize_t blocks) |
2200 | { | |
2201 | return blocks << QIF_DQBLKSIZE_BITS; | |
2202 | } | |
2203 | ||
2204 | static inline qsize_t stoqb(qsize_t space) | |
2205 | { | |
2206 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2207 | } | |
2208 | ||
1da177e4 LT |
2209 | /* Generic routine for getting common part of quota structure */ |
2210 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
2211 | { | |
2212 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2213 | ||
2214 | spin_lock(&dq_data_lock); | |
12095460 JK |
2215 | di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); |
2216 | di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); | |
f18df228 | 2217 | di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; |
1da177e4 LT |
2218 | di->dqb_ihardlimit = dm->dqb_ihardlimit; |
2219 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
2220 | di->dqb_curinodes = dm->dqb_curinodes; | |
2221 | di->dqb_btime = dm->dqb_btime; | |
2222 | di->dqb_itime = dm->dqb_itime; | |
2223 | di->dqb_valid = QIF_ALL; | |
2224 | spin_unlock(&dq_data_lock); | |
2225 | } | |
2226 | ||
2227 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
2228 | { | |
2229 | struct dquot *dquot; | |
2230 | ||
cc33412f JK |
2231 | dquot = dqget(sb, id, type); |
2232 | if (dquot == NODQUOT) | |
1da177e4 | 2233 | return -ESRCH; |
1da177e4 LT |
2234 | do_get_dqblk(dquot, di); |
2235 | dqput(dquot); | |
cc33412f | 2236 | |
1da177e4 LT |
2237 | return 0; |
2238 | } | |
2239 | ||
2240 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 2241 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
2242 | { |
2243 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2244 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
2245 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
2246 | ||
2247 | if ((di->dqb_valid & QIF_BLIMITS && | |
2248 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
2249 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
2250 | (di->dqb_valid & QIF_ILIMITS && | |
2251 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
2252 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
2253 | return -ERANGE; | |
1da177e4 LT |
2254 | |
2255 | spin_lock(&dq_data_lock); | |
2256 | if (di->dqb_valid & QIF_SPACE) { | |
f18df228 | 2257 | dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; |
1da177e4 | 2258 | check_blim = 1; |
4d59bce4 | 2259 | __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 LT |
2260 | } |
2261 | if (di->dqb_valid & QIF_BLIMITS) { | |
12095460 JK |
2262 | dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); |
2263 | dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); | |
1da177e4 | 2264 | check_blim = 1; |
4d59bce4 | 2265 | __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 LT |
2266 | } |
2267 | if (di->dqb_valid & QIF_INODES) { | |
2268 | dm->dqb_curinodes = di->dqb_curinodes; | |
2269 | check_ilim = 1; | |
4d59bce4 | 2270 | __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 LT |
2271 | } |
2272 | if (di->dqb_valid & QIF_ILIMITS) { | |
2273 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
2274 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
2275 | check_ilim = 1; | |
4d59bce4 | 2276 | __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2277 | } |
4d59bce4 | 2278 | if (di->dqb_valid & QIF_BTIME) { |
1da177e4 | 2279 | dm->dqb_btime = di->dqb_btime; |
e04a88a9 | 2280 | check_blim = 1; |
4d59bce4 JK |
2281 | __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
2282 | } | |
2283 | if (di->dqb_valid & QIF_ITIME) { | |
1da177e4 | 2284 | dm->dqb_itime = di->dqb_itime; |
e04a88a9 | 2285 | check_ilim = 1; |
4d59bce4 JK |
2286 | __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
2287 | } | |
1da177e4 LT |
2288 | |
2289 | if (check_blim) { | |
12095460 | 2290 | if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) { |
1da177e4 LT |
2291 | dm->dqb_btime = 0; |
2292 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
2293 | } | |
2294 | else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2295 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2296 | } |
2297 | if (check_ilim) { | |
2298 | if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
2299 | dm->dqb_itime = 0; | |
2300 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
2301 | } | |
2302 | else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 2303 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 LT |
2304 | } |
2305 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit) | |
2306 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2307 | else | |
2308 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2309 | spin_unlock(&dq_data_lock); | |
2310 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2311 | |
2312 | return 0; | |
1da177e4 LT |
2313 | } |
2314 | ||
2315 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
2316 | { | |
2317 | struct dquot *dquot; | |
338bf9af | 2318 | int rc; |
1da177e4 | 2319 | |
f55abc0f JK |
2320 | dquot = dqget(sb, id, type); |
2321 | if (!dquot) { | |
2322 | rc = -ESRCH; | |
2323 | goto out; | |
1da177e4 | 2324 | } |
338bf9af | 2325 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2326 | dqput(dquot); |
f55abc0f | 2327 | out: |
338bf9af | 2328 | return rc; |
1da177e4 LT |
2329 | } |
2330 | ||
2331 | /* Generic routine for getting common part of quota file information */ | |
2332 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2333 | { | |
2334 | struct mem_dqinfo *mi; | |
2335 | ||
d3be915f | 2336 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2337 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2338 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2339 | return -ESRCH; |
2340 | } | |
2341 | mi = sb_dqopt(sb)->info + type; | |
2342 | spin_lock(&dq_data_lock); | |
2343 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2344 | ii->dqi_igrace = mi->dqi_igrace; | |
2345 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
2346 | ii->dqi_valid = IIF_ALL; | |
2347 | spin_unlock(&dq_data_lock); | |
d3be915f | 2348 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2349 | return 0; |
2350 | } | |
2351 | ||
2352 | /* Generic routine for setting common part of quota file information */ | |
2353 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
2354 | { | |
2355 | struct mem_dqinfo *mi; | |
f55abc0f | 2356 | int err = 0; |
1da177e4 | 2357 | |
d3be915f | 2358 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2359 | if (!sb_has_quota_active(sb, type)) { |
2360 | err = -ESRCH; | |
2361 | goto out; | |
1da177e4 LT |
2362 | } |
2363 | mi = sb_dqopt(sb)->info + type; | |
2364 | spin_lock(&dq_data_lock); | |
2365 | if (ii->dqi_valid & IIF_BGRACE) | |
2366 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2367 | if (ii->dqi_valid & IIF_IGRACE) | |
2368 | mi->dqi_igrace = ii->dqi_igrace; | |
2369 | if (ii->dqi_valid & IIF_FLAGS) | |
2370 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK); | |
2371 | spin_unlock(&dq_data_lock); | |
2372 | mark_info_dirty(sb, type); | |
2373 | /* Force write to disk */ | |
2374 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2375 | out: |
d3be915f | 2376 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2377 | return err; |
1da177e4 LT |
2378 | } |
2379 | ||
2380 | struct quotactl_ops vfs_quotactl_ops = { | |
2381 | .quota_on = vfs_quota_on, | |
2382 | .quota_off = vfs_quota_off, | |
2383 | .quota_sync = vfs_quota_sync, | |
2384 | .get_info = vfs_get_dqinfo, | |
2385 | .set_info = vfs_set_dqinfo, | |
2386 | .get_dqblk = vfs_get_dqblk, | |
2387 | .set_dqblk = vfs_set_dqblk | |
2388 | }; | |
2389 | ||
2390 | static ctl_table fs_dqstats_table[] = { | |
2391 | { | |
2392 | .ctl_name = FS_DQ_LOOKUPS, | |
2393 | .procname = "lookups", | |
2394 | .data = &dqstats.lookups, | |
2395 | .maxlen = sizeof(int), | |
2396 | .mode = 0444, | |
2397 | .proc_handler = &proc_dointvec, | |
2398 | }, | |
2399 | { | |
2400 | .ctl_name = FS_DQ_DROPS, | |
2401 | .procname = "drops", | |
2402 | .data = &dqstats.drops, | |
2403 | .maxlen = sizeof(int), | |
2404 | .mode = 0444, | |
2405 | .proc_handler = &proc_dointvec, | |
2406 | }, | |
2407 | { | |
2408 | .ctl_name = FS_DQ_READS, | |
2409 | .procname = "reads", | |
2410 | .data = &dqstats.reads, | |
2411 | .maxlen = sizeof(int), | |
2412 | .mode = 0444, | |
2413 | .proc_handler = &proc_dointvec, | |
2414 | }, | |
2415 | { | |
2416 | .ctl_name = FS_DQ_WRITES, | |
2417 | .procname = "writes", | |
2418 | .data = &dqstats.writes, | |
2419 | .maxlen = sizeof(int), | |
2420 | .mode = 0444, | |
2421 | .proc_handler = &proc_dointvec, | |
2422 | }, | |
2423 | { | |
2424 | .ctl_name = FS_DQ_CACHE_HITS, | |
2425 | .procname = "cache_hits", | |
2426 | .data = &dqstats.cache_hits, | |
2427 | .maxlen = sizeof(int), | |
2428 | .mode = 0444, | |
2429 | .proc_handler = &proc_dointvec, | |
2430 | }, | |
2431 | { | |
2432 | .ctl_name = FS_DQ_ALLOCATED, | |
2433 | .procname = "allocated_dquots", | |
2434 | .data = &dqstats.allocated_dquots, | |
2435 | .maxlen = sizeof(int), | |
2436 | .mode = 0444, | |
2437 | .proc_handler = &proc_dointvec, | |
2438 | }, | |
2439 | { | |
2440 | .ctl_name = FS_DQ_FREE, | |
2441 | .procname = "free_dquots", | |
2442 | .data = &dqstats.free_dquots, | |
2443 | .maxlen = sizeof(int), | |
2444 | .mode = 0444, | |
2445 | .proc_handler = &proc_dointvec, | |
2446 | }, | |
2447 | { | |
2448 | .ctl_name = FS_DQ_SYNCS, | |
2449 | .procname = "syncs", | |
2450 | .data = &dqstats.syncs, | |
2451 | .maxlen = sizeof(int), | |
2452 | .mode = 0444, | |
2453 | .proc_handler = &proc_dointvec, | |
2454 | }, | |
8e893469 | 2455 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
2456 | { |
2457 | .ctl_name = FS_DQ_WARNINGS, | |
2458 | .procname = "warnings", | |
2459 | .data = &flag_print_warnings, | |
2460 | .maxlen = sizeof(int), | |
2461 | .mode = 0644, | |
2462 | .proc_handler = &proc_dointvec, | |
2463 | }, | |
8e893469 | 2464 | #endif |
1da177e4 LT |
2465 | { .ctl_name = 0 }, |
2466 | }; | |
2467 | ||
2468 | static ctl_table fs_table[] = { | |
2469 | { | |
2470 | .ctl_name = FS_DQSTATS, | |
2471 | .procname = "quota", | |
2472 | .mode = 0555, | |
2473 | .child = fs_dqstats_table, | |
2474 | }, | |
2475 | { .ctl_name = 0 }, | |
2476 | }; | |
2477 | ||
2478 | static ctl_table sys_table[] = { | |
2479 | { | |
2480 | .ctl_name = CTL_FS, | |
2481 | .procname = "fs", | |
2482 | .mode = 0555, | |
2483 | .child = fs_table, | |
2484 | }, | |
2485 | { .ctl_name = 0 }, | |
2486 | }; | |
2487 | ||
2488 | static int __init dquot_init(void) | |
2489 | { | |
2490 | int i; | |
2491 | unsigned long nr_hash, order; | |
2492 | ||
2493 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2494 | ||
0b4d4147 | 2495 | register_sysctl_table(sys_table); |
1da177e4 | 2496 | |
20c2df83 | 2497 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2498 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2499 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2500 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2501 | NULL); |
1da177e4 LT |
2502 | |
2503 | order = 0; | |
2504 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2505 | if (!dquot_hash) | |
2506 | panic("Cannot create dquot hash table"); | |
2507 | ||
2508 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2509 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2510 | dq_hash_bits = 0; | |
2511 | do { | |
2512 | dq_hash_bits++; | |
2513 | } while (nr_hash >> dq_hash_bits); | |
2514 | dq_hash_bits--; | |
2515 | ||
2516 | nr_hash = 1UL << dq_hash_bits; | |
2517 | dq_hash_mask = nr_hash - 1; | |
2518 | for (i = 0; i < nr_hash; i++) | |
2519 | INIT_HLIST_HEAD(dquot_hash + i); | |
2520 | ||
2521 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2522 | nr_hash, order, (PAGE_SIZE << order)); | |
2523 | ||
8e1f936b | 2524 | register_shrinker(&dqcache_shrinker); |
1da177e4 | 2525 | |
8e893469 JK |
2526 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
2527 | if (genl_register_family("a_genl_family) != 0) | |
2528 | printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n"); | |
2529 | #endif | |
2530 | ||
1da177e4 LT |
2531 | return 0; |
2532 | } | |
2533 | module_init(dquot_init); | |
2534 | ||
2535 | EXPORT_SYMBOL(register_quota_format); | |
2536 | EXPORT_SYMBOL(unregister_quota_format); | |
2537 | EXPORT_SYMBOL(dqstats); | |
2538 | EXPORT_SYMBOL(dq_data_lock); | |
f55abc0f | 2539 | EXPORT_SYMBOL(vfs_quota_enable); |
1da177e4 | 2540 | EXPORT_SYMBOL(vfs_quota_on); |
77e69dac | 2541 | EXPORT_SYMBOL(vfs_quota_on_path); |
1da177e4 | 2542 | EXPORT_SYMBOL(vfs_quota_on_mount); |
f55abc0f | 2543 | EXPORT_SYMBOL(vfs_quota_disable); |
1da177e4 | 2544 | EXPORT_SYMBOL(vfs_quota_off); |
12c77527 | 2545 | EXPORT_SYMBOL(dquot_scan_active); |
1da177e4 LT |
2546 | EXPORT_SYMBOL(vfs_quota_sync); |
2547 | EXPORT_SYMBOL(vfs_get_dqinfo); | |
2548 | EXPORT_SYMBOL(vfs_set_dqinfo); | |
2549 | EXPORT_SYMBOL(vfs_get_dqblk); | |
2550 | EXPORT_SYMBOL(vfs_set_dqblk); | |
2551 | EXPORT_SYMBOL(dquot_commit); | |
2552 | EXPORT_SYMBOL(dquot_commit_info); | |
2553 | EXPORT_SYMBOL(dquot_acquire); | |
2554 | EXPORT_SYMBOL(dquot_release); | |
2555 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); | |
2556 | EXPORT_SYMBOL(dquot_initialize); | |
2557 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 2558 | EXPORT_SYMBOL(vfs_dq_drop); |
3d9ea253 JK |
2559 | EXPORT_SYMBOL(dqget); |
2560 | EXPORT_SYMBOL(dqput); | |
1da177e4 LT |
2561 | EXPORT_SYMBOL(dquot_alloc_space); |
2562 | EXPORT_SYMBOL(dquot_alloc_inode); | |
2563 | EXPORT_SYMBOL(dquot_free_space); | |
2564 | EXPORT_SYMBOL(dquot_free_inode); | |
2565 | EXPORT_SYMBOL(dquot_transfer); | |
b85f4b87 JK |
2566 | EXPORT_SYMBOL(vfs_dq_transfer); |
2567 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |