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