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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 | * | |
12 | * Version: $Id: dquot.c,v 6.3 1996/11/17 18:35:34 mvw Exp mvw $ | |
13 | * | |
14 | * Author: Marco van Wieringen <mvw@planets.elm.net> | |
15 | * | |
16 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
17 | * | |
18 | * Revised list management to avoid races | |
19 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
20 | * | |
21 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
22 | * As the consequence the locking was moved from dquot_decr_...(), | |
23 | * dquot_incr_...() to calling functions. | |
24 | * invalidate_dquots() now writes modified dquots. | |
25 | * Serialized quota_off() and quota_on() for mount point. | |
26 | * Fixed a few bugs in grow_dquots(). | |
27 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
28 | * quota files | |
29 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
30 | * add_dquot_ref() restarts after blocking | |
31 | * Added check for bogus uid and fixed check for group in quotactl. | |
32 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
33 | * | |
34 | * Used struct list_head instead of own list struct | |
35 | * Invalidation of referenced dquots is no longer possible | |
36 | * Improved free_dquots list management | |
37 | * Quota and i_blocks are now updated in one place to avoid races | |
38 | * Warnings are now delayed so we won't block in critical section | |
39 | * Write updated not to require dquot lock | |
40 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
41 | * | |
42 | * Added dynamic quota structure allocation | |
43 | * Jan Kara <jack@suse.cz> 12/2000 | |
44 | * | |
45 | * Rewritten quota interface. Implemented new quota format and | |
46 | * formats registering. | |
47 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
48 | * | |
49 | * New SMP locking. | |
50 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
51 | * | |
52 | * Added journalled quota support, fix lock inversion problems | |
53 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
54 | * | |
55 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
56 | */ | |
57 | ||
58 | #include <linux/errno.h> | |
59 | #include <linux/kernel.h> | |
60 | #include <linux/fs.h> | |
61 | #include <linux/mount.h> | |
62 | #include <linux/mm.h> | |
63 | #include <linux/time.h> | |
64 | #include <linux/types.h> | |
65 | #include <linux/string.h> | |
66 | #include <linux/fcntl.h> | |
67 | #include <linux/stat.h> | |
68 | #include <linux/tty.h> | |
69 | #include <linux/file.h> | |
70 | #include <linux/slab.h> | |
71 | #include <linux/sysctl.h> | |
1da177e4 LT |
72 | #include <linux/init.h> |
73 | #include <linux/module.h> | |
74 | #include <linux/proc_fs.h> | |
75 | #include <linux/security.h> | |
76 | #include <linux/kmod.h> | |
77 | #include <linux/namei.h> | |
78 | #include <linux/buffer_head.h> | |
16f7e0fe | 79 | #include <linux/capability.h> |
be586bab | 80 | #include <linux/quotaops.h> |
fb58b731 | 81 | #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ |
8e893469 JK |
82 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
83 | #include <net/netlink.h> | |
84 | #include <net/genetlink.h> | |
85 | #endif | |
1da177e4 LT |
86 | |
87 | #include <asm/uaccess.h> | |
88 | ||
89 | #define __DQUOT_PARANOIA | |
90 | ||
91 | /* | |
92 | * There are two quota SMP locks. dq_list_lock protects all lists with quotas | |
93 | * and quota formats and also dqstats structure containing statistics about the | |
94 | * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures | |
95 | * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
96 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly | |
97 | * in inode_add_bytes() and inode_sub_bytes(). | |
98 | * | |
99 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock | |
100 | * | |
101 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
102 | * the life of the dquot structure and so needn't to be protected by a lock | |
103 | * | |
104 | * Any operation working on dquots via inode pointers must hold dqptr_sem. If | |
105 | * operation is just reading pointers from inode (or not using them at all) the | |
106 | * read lock is enough. If pointers are altered function must hold write lock | |
107 | * (these locking rules also apply for S_NOQUOTA flag in the inode - note that | |
1b1dcc1b | 108 | * for altering the flag i_mutex is also needed). If operation is holding |
1da177e4 | 109 | * reference to dquot in other way (e.g. quotactl ops) it must be guarded by |
d3be915f | 110 | * dqonoff_mutex. |
1da177e4 LT |
111 | * This locking assures that: |
112 | * a) update/access to dquot pointers in inode is serialized | |
113 | * b) everyone is guarded against invalidate_dquots() | |
114 | * | |
d3be915f | 115 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
116 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
117 | * Currently dquot is locked only when it is being read to memory (or space for | |
118 | * it is being allocated) on the first dqget() and when it is being released on | |
119 | * the last dqput(). The allocation and release oparations are serialized by | |
120 | * the dq_lock and by checking the use count in dquot_release(). Write | |
121 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
122 | * spinlock to internal buffers before writing. | |
123 | * | |
124 | * Lock ordering (including related VFS locks) is the following: | |
d3be915f IM |
125 | * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > |
126 | * dqio_mutex | |
127 | * i_mutex on quota files is special (it's below dqio_mutex) | |
1da177e4 LT |
128 | */ |
129 | ||
130 | static DEFINE_SPINLOCK(dq_list_lock); | |
131 | DEFINE_SPINLOCK(dq_data_lock); | |
132 | ||
133 | static char *quotatypes[] = INITQFNAMES; | |
134 | static struct quota_format_type *quota_formats; /* List of registered formats */ | |
135 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
136 | ||
137 | /* SLAB cache for dquot structures */ | |
e18b890b | 138 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
139 | |
140 | int register_quota_format(struct quota_format_type *fmt) | |
141 | { | |
142 | spin_lock(&dq_list_lock); | |
143 | fmt->qf_next = quota_formats; | |
144 | quota_formats = fmt; | |
145 | spin_unlock(&dq_list_lock); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | void unregister_quota_format(struct quota_format_type *fmt) | |
150 | { | |
151 | struct quota_format_type **actqf; | |
152 | ||
153 | spin_lock(&dq_list_lock); | |
154 | for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next); | |
155 | if (*actqf) | |
156 | *actqf = (*actqf)->qf_next; | |
157 | spin_unlock(&dq_list_lock); | |
158 | } | |
159 | ||
160 | static struct quota_format_type *find_quota_format(int id) | |
161 | { | |
162 | struct quota_format_type *actqf; | |
163 | ||
164 | spin_lock(&dq_list_lock); | |
165 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next); | |
166 | if (!actqf || !try_module_get(actqf->qf_owner)) { | |
167 | int qm; | |
168 | ||
169 | spin_unlock(&dq_list_lock); | |
170 | ||
171 | for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++); | |
172 | if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name)) | |
173 | return NULL; | |
174 | ||
175 | spin_lock(&dq_list_lock); | |
176 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next); | |
177 | if (actqf && !try_module_get(actqf->qf_owner)) | |
178 | actqf = NULL; | |
179 | } | |
180 | spin_unlock(&dq_list_lock); | |
181 | return actqf; | |
182 | } | |
183 | ||
184 | static void put_quota_format(struct quota_format_type *fmt) | |
185 | { | |
186 | module_put(fmt->qf_owner); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Dquot List Management: | |
191 | * The quota code uses three lists for dquot management: the inuse_list, | |
192 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
193 | * on all three lists, depending on its current state. | |
194 | * | |
195 | * All dquots are placed to the end of inuse_list when first created, and this | |
196 | * list is used for invalidate operation, which must look at every dquot. | |
197 | * | |
198 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
199 | * and this list is searched whenever we need an available dquot. Dquots are | |
200 | * removed from the list as soon as they are used again, and | |
201 | * dqstats.free_dquots gives the number of dquots on the list. When | |
202 | * dquot is invalidated it's completely released from memory. | |
203 | * | |
204 | * Dquots with a specific identity (device, type and id) are placed on | |
205 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
206 | * mechanism to locate a specific dquot. | |
207 | */ | |
208 | ||
209 | static LIST_HEAD(inuse_list); | |
210 | static LIST_HEAD(free_dquots); | |
211 | static unsigned int dq_hash_bits, dq_hash_mask; | |
212 | static struct hlist_head *dquot_hash; | |
213 | ||
214 | struct dqstats dqstats; | |
215 | ||
216 | static void dqput(struct dquot *dquot); | |
217 | ||
218 | static inline unsigned int | |
219 | hashfn(const struct super_block *sb, unsigned int id, int type) | |
220 | { | |
221 | unsigned long tmp; | |
222 | ||
223 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
224 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Following list functions expect dq_list_lock to be held | |
229 | */ | |
230 | static inline void insert_dquot_hash(struct dquot *dquot) | |
231 | { | |
232 | struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); | |
233 | hlist_add_head(&dquot->dq_hash, head); | |
234 | } | |
235 | ||
236 | static inline void remove_dquot_hash(struct dquot *dquot) | |
237 | { | |
238 | hlist_del_init(&dquot->dq_hash); | |
239 | } | |
240 | ||
241 | static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type) | |
242 | { | |
243 | struct hlist_node *node; | |
244 | struct dquot *dquot; | |
245 | ||
246 | hlist_for_each (node, dquot_hash+hashent) { | |
247 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
248 | if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type) | |
249 | return dquot; | |
250 | } | |
251 | return NODQUOT; | |
252 | } | |
253 | ||
254 | /* Add a dquot to the tail of the free list */ | |
255 | static inline void put_dquot_last(struct dquot *dquot) | |
256 | { | |
8e13059a | 257 | list_add_tail(&dquot->dq_free, &free_dquots); |
1da177e4 LT |
258 | dqstats.free_dquots++; |
259 | } | |
260 | ||
261 | static inline void remove_free_dquot(struct dquot *dquot) | |
262 | { | |
263 | if (list_empty(&dquot->dq_free)) | |
264 | return; | |
265 | list_del_init(&dquot->dq_free); | |
266 | dqstats.free_dquots--; | |
267 | } | |
268 | ||
269 | static inline void put_inuse(struct dquot *dquot) | |
270 | { | |
271 | /* We add to the back of inuse list so we don't have to restart | |
272 | * when traversing this list and we block */ | |
8e13059a | 273 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
1da177e4 LT |
274 | dqstats.allocated_dquots++; |
275 | } | |
276 | ||
277 | static inline void remove_inuse(struct dquot *dquot) | |
278 | { | |
279 | dqstats.allocated_dquots--; | |
280 | list_del(&dquot->dq_inuse); | |
281 | } | |
282 | /* | |
283 | * End of list functions needing dq_list_lock | |
284 | */ | |
285 | ||
286 | static void wait_on_dquot(struct dquot *dquot) | |
287 | { | |
d3be915f IM |
288 | mutex_lock(&dquot->dq_lock); |
289 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
290 | } |
291 | ||
03f6e92b JK |
292 | static inline int dquot_dirty(struct dquot *dquot) |
293 | { | |
294 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
295 | } | |
296 | ||
297 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
298 | { | |
299 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
300 | } | |
1da177e4 LT |
301 | |
302 | int dquot_mark_dquot_dirty(struct dquot *dquot) | |
303 | { | |
304 | spin_lock(&dq_list_lock); | |
305 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) | |
306 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> | |
307 | info[dquot->dq_type].dqi_dirty_list); | |
308 | spin_unlock(&dq_list_lock); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | /* This function needs dq_list_lock */ | |
313 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
314 | { | |
315 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
316 | return 0; | |
317 | list_del_init(&dquot->dq_dirty); | |
318 | return 1; | |
319 | } | |
320 | ||
321 | void mark_info_dirty(struct super_block *sb, int type) | |
322 | { | |
323 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
324 | } | |
325 | EXPORT_SYMBOL(mark_info_dirty); | |
326 | ||
327 | /* | |
328 | * Read dquot from disk and alloc space for it | |
329 | */ | |
330 | ||
331 | int dquot_acquire(struct dquot *dquot) | |
332 | { | |
333 | int ret = 0, ret2 = 0; | |
334 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
335 | ||
d3be915f IM |
336 | mutex_lock(&dquot->dq_lock); |
337 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 LT |
338 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
339 | ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); | |
340 | if (ret < 0) | |
341 | goto out_iolock; | |
342 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
343 | /* Instantiate dquot if needed */ | |
344 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
345 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
346 | /* Write the info if needed */ | |
347 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
348 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
349 | if (ret < 0) | |
350 | goto out_iolock; | |
351 | if (ret2 < 0) { | |
352 | ret = ret2; | |
353 | goto out_iolock; | |
354 | } | |
355 | } | |
356 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
357 | out_iolock: | |
d3be915f IM |
358 | mutex_unlock(&dqopt->dqio_mutex); |
359 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
360 | return ret; |
361 | } | |
362 | ||
363 | /* | |
364 | * Write dquot to disk | |
365 | */ | |
366 | int dquot_commit(struct dquot *dquot) | |
367 | { | |
368 | int ret = 0, ret2 = 0; | |
369 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
370 | ||
d3be915f | 371 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
372 | spin_lock(&dq_list_lock); |
373 | if (!clear_dquot_dirty(dquot)) { | |
374 | spin_unlock(&dq_list_lock); | |
375 | goto out_sem; | |
376 | } | |
377 | spin_unlock(&dq_list_lock); | |
378 | /* Inactive dquot can be only if there was error during read/init | |
379 | * => we have better not writing it */ | |
380 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
381 | ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); | |
382 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
383 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
384 | if (ret >= 0) | |
385 | ret = ret2; | |
386 | } | |
387 | out_sem: | |
d3be915f | 388 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
389 | return ret; |
390 | } | |
391 | ||
392 | /* | |
393 | * Release dquot | |
394 | */ | |
395 | int dquot_release(struct dquot *dquot) | |
396 | { | |
397 | int ret = 0, ret2 = 0; | |
398 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
399 | ||
d3be915f | 400 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
401 | /* Check whether we are not racing with some other dqget() */ |
402 | if (atomic_read(&dquot->dq_count) > 1) | |
403 | goto out_dqlock; | |
d3be915f | 404 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
405 | if (dqopt->ops[dquot->dq_type]->release_dqblk) { |
406 | ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); | |
407 | /* Write the info */ | |
408 | if (info_dirty(&dqopt->info[dquot->dq_type])) | |
409 | ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type); | |
410 | if (ret >= 0) | |
411 | ret = ret2; | |
412 | } | |
413 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 414 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 415 | out_dqlock: |
d3be915f | 416 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
417 | return ret; |
418 | } | |
419 | ||
420 | /* Invalidate all dquots on the list. Note that this function is called after | |
421 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
422 | * quota users. There can still be some users of quotas due to inodes being |
423 | * just deleted or pruned by prune_icache() (those are not attached to any | |
424 | * list). We have to wait for such users. | |
425 | */ | |
1da177e4 LT |
426 | static void invalidate_dquots(struct super_block *sb, int type) |
427 | { | |
c33ed271 | 428 | struct dquot *dquot, *tmp; |
1da177e4 | 429 | |
6362e4d4 | 430 | restart: |
1da177e4 | 431 | spin_lock(&dq_list_lock); |
c33ed271 | 432 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
433 | if (dquot->dq_sb != sb) |
434 | continue; | |
435 | if (dquot->dq_type != type) | |
436 | continue; | |
6362e4d4 JK |
437 | /* Wait for dquot users */ |
438 | if (atomic_read(&dquot->dq_count)) { | |
439 | DEFINE_WAIT(wait); | |
440 | ||
441 | atomic_inc(&dquot->dq_count); | |
442 | prepare_to_wait(&dquot->dq_wait_unused, &wait, | |
443 | TASK_UNINTERRUPTIBLE); | |
444 | spin_unlock(&dq_list_lock); | |
445 | /* Once dqput() wakes us up, we know it's time to free | |
446 | * the dquot. | |
447 | * IMPORTANT: we rely on the fact that there is always | |
448 | * at most one process waiting for dquot to free. | |
449 | * Otherwise dq_count would be > 1 and we would never | |
450 | * wake up. | |
451 | */ | |
452 | if (atomic_read(&dquot->dq_count) > 1) | |
453 | schedule(); | |
454 | finish_wait(&dquot->dq_wait_unused, &wait); | |
455 | dqput(dquot); | |
456 | /* At this moment dquot() need not exist (it could be | |
457 | * reclaimed by prune_dqcache(). Hence we must | |
458 | * restart. */ | |
459 | goto restart; | |
460 | } | |
461 | /* | |
462 | * Quota now has no users and it has been written on last | |
463 | * dqput() | |
464 | */ | |
1da177e4 LT |
465 | remove_dquot_hash(dquot); |
466 | remove_free_dquot(dquot); | |
467 | remove_inuse(dquot); | |
468 | kmem_cache_free(dquot_cachep, dquot); | |
469 | } | |
470 | spin_unlock(&dq_list_lock); | |
471 | } | |
472 | ||
473 | int vfs_quota_sync(struct super_block *sb, int type) | |
474 | { | |
475 | struct list_head *dirty; | |
476 | struct dquot *dquot; | |
477 | struct quota_info *dqopt = sb_dqopt(sb); | |
478 | int cnt; | |
479 | ||
d3be915f | 480 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
481 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
482 | if (type != -1 && cnt != type) | |
483 | continue; | |
484 | if (!sb_has_quota_enabled(sb, cnt)) | |
485 | continue; | |
486 | spin_lock(&dq_list_lock); | |
487 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
488 | while (!list_empty(dirty)) { | |
b5e61818 | 489 | dquot = list_first_entry(dirty, struct dquot, dq_dirty); |
1da177e4 LT |
490 | /* Dirty and inactive can be only bad dquot... */ |
491 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
492 | clear_dquot_dirty(dquot); | |
493 | continue; | |
494 | } | |
495 | /* Now we have active dquot from which someone is | |
496 | * holding reference so we can safely just increase | |
497 | * use count */ | |
498 | atomic_inc(&dquot->dq_count); | |
499 | dqstats.lookups++; | |
500 | spin_unlock(&dq_list_lock); | |
501 | sb->dq_op->write_dquot(dquot); | |
502 | dqput(dquot); | |
503 | spin_lock(&dq_list_lock); | |
504 | } | |
505 | spin_unlock(&dq_list_lock); | |
506 | } | |
507 | ||
508 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
509 | if ((cnt == type || type == -1) && sb_has_quota_enabled(sb, cnt) | |
510 | && info_dirty(&dqopt->info[cnt])) | |
511 | sb->dq_op->write_info(sb, cnt); | |
512 | spin_lock(&dq_list_lock); | |
513 | dqstats.syncs++; | |
514 | spin_unlock(&dq_list_lock); | |
d3be915f | 515 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* Free unused dquots from cache */ | |
521 | static void prune_dqcache(int count) | |
522 | { | |
523 | struct list_head *head; | |
524 | struct dquot *dquot; | |
525 | ||
526 | head = free_dquots.prev; | |
527 | while (head != &free_dquots && count) { | |
528 | dquot = list_entry(head, struct dquot, dq_free); | |
529 | remove_dquot_hash(dquot); | |
530 | remove_free_dquot(dquot); | |
531 | remove_inuse(dquot); | |
532 | kmem_cache_free(dquot_cachep, dquot); | |
533 | count--; | |
534 | head = free_dquots.prev; | |
535 | } | |
536 | } | |
537 | ||
538 | /* | |
539 | * This is called from kswapd when we think we need some | |
540 | * more memory | |
541 | */ | |
542 | ||
27496a8c | 543 | static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) |
1da177e4 LT |
544 | { |
545 | if (nr) { | |
546 | spin_lock(&dq_list_lock); | |
547 | prune_dqcache(nr); | |
548 | spin_unlock(&dq_list_lock); | |
549 | } | |
550 | return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; | |
551 | } | |
552 | ||
8e1f936b RR |
553 | static struct shrinker dqcache_shrinker = { |
554 | .shrink = shrink_dqcache_memory, | |
555 | .seeks = DEFAULT_SEEKS, | |
556 | }; | |
557 | ||
1da177e4 LT |
558 | /* |
559 | * Put reference to dquot | |
560 | * NOTE: If you change this function please check whether dqput_blocks() works right... | |
d3be915f | 561 | * MUST be called with either dqptr_sem or dqonoff_mutex held |
1da177e4 LT |
562 | */ |
563 | static void dqput(struct dquot *dquot) | |
564 | { | |
b48d3805 JK |
565 | int ret; |
566 | ||
1da177e4 LT |
567 | if (!dquot) |
568 | return; | |
569 | #ifdef __DQUOT_PARANOIA | |
570 | if (!atomic_read(&dquot->dq_count)) { | |
571 | printk("VFS: dqput: trying to free free dquot\n"); | |
572 | printk("VFS: device %s, dquot of %s %d\n", | |
573 | dquot->dq_sb->s_id, | |
574 | quotatypes[dquot->dq_type], | |
575 | dquot->dq_id); | |
576 | BUG(); | |
577 | } | |
578 | #endif | |
579 | ||
580 | spin_lock(&dq_list_lock); | |
581 | dqstats.drops++; | |
582 | spin_unlock(&dq_list_lock); | |
583 | we_slept: | |
584 | spin_lock(&dq_list_lock); | |
585 | if (atomic_read(&dquot->dq_count) > 1) { | |
586 | /* We have more than one user... nothing to do */ | |
587 | atomic_dec(&dquot->dq_count); | |
6362e4d4 JK |
588 | /* Releasing dquot during quotaoff phase? */ |
589 | if (!sb_has_quota_enabled(dquot->dq_sb, dquot->dq_type) && | |
590 | atomic_read(&dquot->dq_count) == 1) | |
591 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
592 | spin_unlock(&dq_list_lock); |
593 | return; | |
594 | } | |
595 | /* Need to release dquot? */ | |
596 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
597 | spin_unlock(&dq_list_lock); | |
598 | /* Commit dquot before releasing */ | |
b48d3805 JK |
599 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
600 | if (ret < 0) { | |
601 | printk(KERN_ERR "VFS: cannot write quota structure on " | |
602 | "device %s (error %d). Quota may get out of " | |
603 | "sync!\n", dquot->dq_sb->s_id, ret); | |
604 | /* | |
605 | * We clear dirty bit anyway, so that we avoid | |
606 | * infinite loop here | |
607 | */ | |
608 | spin_lock(&dq_list_lock); | |
609 | clear_dquot_dirty(dquot); | |
610 | spin_unlock(&dq_list_lock); | |
611 | } | |
1da177e4 LT |
612 | goto we_slept; |
613 | } | |
614 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
615 | clear_dquot_dirty(dquot); | |
616 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
617 | spin_unlock(&dq_list_lock); | |
618 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
619 | goto we_slept; | |
620 | } | |
621 | atomic_dec(&dquot->dq_count); | |
622 | #ifdef __DQUOT_PARANOIA | |
623 | /* sanity check */ | |
8abf6a47 | 624 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
625 | #endif |
626 | put_dquot_last(dquot); | |
627 | spin_unlock(&dq_list_lock); | |
628 | } | |
629 | ||
630 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) | |
631 | { | |
632 | struct dquot *dquot; | |
633 | ||
c3762229 | 634 | dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS); |
1da177e4 LT |
635 | if(!dquot) |
636 | return NODQUOT; | |
637 | ||
d3be915f | 638 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
639 | INIT_LIST_HEAD(&dquot->dq_free); |
640 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
641 | INIT_HLIST_NODE(&dquot->dq_hash); | |
642 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 643 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 LT |
644 | dquot->dq_sb = sb; |
645 | dquot->dq_type = type; | |
646 | atomic_set(&dquot->dq_count, 1); | |
647 | ||
648 | return dquot; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Get reference to dquot | |
d3be915f | 653 | * MUST be called with either dqptr_sem or dqonoff_mutex held |
1da177e4 LT |
654 | */ |
655 | static struct dquot *dqget(struct super_block *sb, unsigned int id, int type) | |
656 | { | |
657 | unsigned int hashent = hashfn(sb, id, type); | |
658 | struct dquot *dquot, *empty = NODQUOT; | |
659 | ||
660 | if (!sb_has_quota_enabled(sb, type)) | |
661 | return NODQUOT; | |
662 | we_slept: | |
663 | spin_lock(&dq_list_lock); | |
664 | if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) { | |
665 | if (empty == NODQUOT) { | |
666 | spin_unlock(&dq_list_lock); | |
667 | if ((empty = get_empty_dquot(sb, type)) == NODQUOT) | |
668 | schedule(); /* Try to wait for a moment... */ | |
669 | goto we_slept; | |
670 | } | |
671 | dquot = empty; | |
672 | dquot->dq_id = id; | |
673 | /* all dquots go on the inuse_list */ | |
674 | put_inuse(dquot); | |
675 | /* hash it first so it can be found */ | |
676 | insert_dquot_hash(dquot); | |
677 | dqstats.lookups++; | |
678 | spin_unlock(&dq_list_lock); | |
679 | } else { | |
680 | if (!atomic_read(&dquot->dq_count)) | |
681 | remove_free_dquot(dquot); | |
682 | atomic_inc(&dquot->dq_count); | |
683 | dqstats.cache_hits++; | |
684 | dqstats.lookups++; | |
685 | spin_unlock(&dq_list_lock); | |
686 | if (empty) | |
687 | kmem_cache_free(dquot_cachep, empty); | |
688 | } | |
689 | /* Wait for dq_lock - after this we know that either dquot_release() is already | |
690 | * finished or it will be canceled due to dq_count > 1 test */ | |
691 | wait_on_dquot(dquot); | |
692 | /* Read the dquot and instantiate it (everything done only if needed) */ | |
693 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) { | |
694 | dqput(dquot); | |
695 | return NODQUOT; | |
696 | } | |
697 | #ifdef __DQUOT_PARANOIA | |
8abf6a47 | 698 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 LT |
699 | #endif |
700 | ||
701 | return dquot; | |
702 | } | |
703 | ||
704 | static int dqinit_needed(struct inode *inode, int type) | |
705 | { | |
706 | int cnt; | |
707 | ||
708 | if (IS_NOQUOTA(inode)) | |
709 | return 0; | |
710 | if (type != -1) | |
711 | return inode->i_dquot[type] == NODQUOT; | |
712 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
713 | if (inode->i_dquot[cnt] == NODQUOT) | |
714 | return 1; | |
715 | return 0; | |
716 | } | |
717 | ||
d3be915f | 718 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
719 | static void add_dquot_ref(struct super_block *sb, int type) |
720 | { | |
941d2380 | 721 | struct inode *inode, *old_inode = NULL; |
1da177e4 | 722 | |
d003fb70 CH |
723 | spin_lock(&inode_lock); |
724 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
725 | if (!atomic_read(&inode->i_writecount)) | |
726 | continue; | |
727 | if (!dqinit_needed(inode, type)) | |
728 | continue; | |
729 | if (inode->i_state & (I_FREEING|I_WILL_FREE)) | |
730 | continue; | |
731 | ||
732 | __iget(inode); | |
733 | spin_unlock(&inode_lock); | |
734 | ||
941d2380 | 735 | iput(old_inode); |
d003fb70 | 736 | sb->dq_op->initialize(inode, type); |
941d2380 JK |
737 | /* We hold a reference to 'inode' so it couldn't have been |
738 | * removed from s_inodes list while we dropped the inode_lock. | |
739 | * We cannot iput the inode now as we can be holding the last | |
740 | * reference and we cannot iput it under inode_lock. So we | |
741 | * keep the reference and iput it later. */ | |
742 | old_inode = inode; | |
743 | spin_lock(&inode_lock); | |
1da177e4 | 744 | } |
d003fb70 | 745 | spin_unlock(&inode_lock); |
941d2380 | 746 | iput(old_inode); |
1da177e4 LT |
747 | } |
748 | ||
749 | /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */ | |
750 | static inline int dqput_blocks(struct dquot *dquot) | |
751 | { | |
752 | if (atomic_read(&dquot->dq_count) <= 1) | |
753 | return 1; | |
754 | return 0; | |
755 | } | |
756 | ||
757 | /* Remove references to dquots from inode - add dquot to list for freeing if needed */ | |
758 | /* We can't race with anybody because we hold dqptr_sem for writing... */ | |
e5f00f42 AB |
759 | static int remove_inode_dquot_ref(struct inode *inode, int type, |
760 | struct list_head *tofree_head) | |
1da177e4 LT |
761 | { |
762 | struct dquot *dquot = inode->i_dquot[type]; | |
763 | ||
764 | inode->i_dquot[type] = NODQUOT; | |
765 | if (dquot != NODQUOT) { | |
766 | if (dqput_blocks(dquot)) { | |
767 | #ifdef __DQUOT_PARANOIA | |
768 | if (atomic_read(&dquot->dq_count) != 1) | |
769 | printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); | |
770 | #endif | |
771 | spin_lock(&dq_list_lock); | |
772 | list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */ | |
773 | spin_unlock(&dq_list_lock); | |
774 | return 1; | |
775 | } | |
776 | else | |
777 | dqput(dquot); /* We have guaranteed we won't block */ | |
778 | } | |
779 | return 0; | |
780 | } | |
781 | ||
782 | /* Free list of dquots - called from inode.c */ | |
783 | /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */ | |
784 | static void put_dquot_list(struct list_head *tofree_head) | |
785 | { | |
786 | struct list_head *act_head; | |
787 | struct dquot *dquot; | |
788 | ||
789 | act_head = tofree_head->next; | |
790 | /* So now we have dquots on the list... Just free them */ | |
791 | while (act_head != tofree_head) { | |
792 | dquot = list_entry(act_head, struct dquot, dq_free); | |
793 | act_head = act_head->next; | |
794 | list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */ | |
795 | dqput(dquot); | |
796 | } | |
797 | } | |
798 | ||
fb58b731 CH |
799 | static void remove_dquot_ref(struct super_block *sb, int type, |
800 | struct list_head *tofree_head) | |
801 | { | |
802 | struct inode *inode; | |
803 | ||
804 | spin_lock(&inode_lock); | |
805 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
806 | if (!IS_NOQUOTA(inode)) | |
807 | remove_inode_dquot_ref(inode, type, tofree_head); | |
808 | } | |
809 | spin_unlock(&inode_lock); | |
810 | } | |
811 | ||
1da177e4 LT |
812 | /* Gather all references from inodes and drop them */ |
813 | static void drop_dquot_ref(struct super_block *sb, int type) | |
814 | { | |
815 | LIST_HEAD(tofree_head); | |
816 | ||
fb58b731 CH |
817 | if (sb->dq_op) { |
818 | down_write(&sb_dqopt(sb)->dqptr_sem); | |
819 | remove_dquot_ref(sb, type, &tofree_head); | |
820 | up_write(&sb_dqopt(sb)->dqptr_sem); | |
821 | put_dquot_list(&tofree_head); | |
822 | } | |
1da177e4 LT |
823 | } |
824 | ||
825 | static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number) | |
826 | { | |
827 | dquot->dq_dqb.dqb_curinodes += number; | |
828 | } | |
829 | ||
830 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
831 | { | |
832 | dquot->dq_dqb.dqb_curspace += number; | |
833 | } | |
834 | ||
835 | static inline void dquot_decr_inodes(struct dquot *dquot, unsigned long number) | |
836 | { | |
837 | if (dquot->dq_dqb.dqb_curinodes > number) | |
838 | dquot->dq_dqb.dqb_curinodes -= number; | |
839 | else | |
840 | dquot->dq_dqb.dqb_curinodes = 0; | |
841 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
842 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
843 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
844 | } | |
845 | ||
846 | static inline void dquot_decr_space(struct dquot *dquot, qsize_t number) | |
847 | { | |
848 | if (dquot->dq_dqb.dqb_curspace > number) | |
849 | dquot->dq_dqb.dqb_curspace -= number; | |
850 | else | |
851 | dquot->dq_dqb.dqb_curspace = 0; | |
852 | if (toqb(dquot->dq_dqb.dqb_curspace) <= dquot->dq_dqb.dqb_bsoftlimit) | |
853 | dquot->dq_dqb.dqb_btime = (time_t) 0; | |
854 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
855 | } | |
856 | ||
c525460e JK |
857 | static int warning_issued(struct dquot *dquot, const int warntype) |
858 | { | |
859 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
860 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
861 | ((warntype == QUOTA_NL_IHARDWARN || | |
862 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
863 | ||
864 | if (!flag) | |
865 | return 0; | |
866 | return test_and_set_bit(flag, &dquot->dq_flags); | |
867 | } | |
868 | ||
8e893469 | 869 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
870 | static int flag_print_warnings = 1; |
871 | ||
872 | static inline int need_print_warning(struct dquot *dquot) | |
873 | { | |
874 | if (!flag_print_warnings) | |
875 | return 0; | |
876 | ||
877 | switch (dquot->dq_type) { | |
878 | case USRQUOTA: | |
879 | return current->fsuid == dquot->dq_id; | |
880 | case GRPQUOTA: | |
881 | return in_group_p(dquot->dq_id); | |
882 | } | |
883 | return 0; | |
884 | } | |
885 | ||
1da177e4 | 886 | /* Print warning to user which exceeded quota */ |
c525460e | 887 | static void print_warning(struct dquot *dquot, const int warntype) |
1da177e4 LT |
888 | { |
889 | char *msg = NULL; | |
24ec839c | 890 | struct tty_struct *tty; |
1da177e4 | 891 | |
c525460e | 892 | if (!need_print_warning(dquot)) |
1da177e4 LT |
893 | return; |
894 | ||
b525a7e4 | 895 | mutex_lock(&tty_mutex); |
24ec839c PZ |
896 | tty = get_current_tty(); |
897 | if (!tty) | |
b525a7e4 | 898 | goto out_lock; |
24ec839c | 899 | tty_write_message(tty, dquot->dq_sb->s_id); |
8e893469 | 900 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 901 | tty_write_message(tty, ": warning, "); |
1da177e4 | 902 | else |
24ec839c PZ |
903 | tty_write_message(tty, ": write failed, "); |
904 | tty_write_message(tty, quotatypes[dquot->dq_type]); | |
1da177e4 | 905 | switch (warntype) { |
8e893469 | 906 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
907 | msg = " file limit reached.\r\n"; |
908 | break; | |
8e893469 | 909 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
910 | msg = " file quota exceeded too long.\r\n"; |
911 | break; | |
8e893469 | 912 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
913 | msg = " file quota exceeded.\r\n"; |
914 | break; | |
8e893469 | 915 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
916 | msg = " block limit reached.\r\n"; |
917 | break; | |
8e893469 | 918 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
919 | msg = " block quota exceeded too long.\r\n"; |
920 | break; | |
8e893469 | 921 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
922 | msg = " block quota exceeded.\r\n"; |
923 | break; | |
924 | } | |
24ec839c | 925 | tty_write_message(tty, msg); |
b525a7e4 JK |
926 | out_lock: |
927 | mutex_unlock(&tty_mutex); | |
1da177e4 | 928 | } |
8e893469 JK |
929 | #endif |
930 | ||
931 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
932 | ||
8e893469 JK |
933 | /* Netlink family structure for quota */ |
934 | static struct genl_family quota_genl_family = { | |
935 | .id = GENL_ID_GENERATE, | |
936 | .hdrsize = 0, | |
937 | .name = "VFS_DQUOT", | |
938 | .version = 1, | |
939 | .maxattr = QUOTA_NL_A_MAX, | |
940 | }; | |
941 | ||
942 | /* Send warning to userspace about user which exceeded quota */ | |
943 | static void send_warning(const struct dquot *dquot, const char warntype) | |
944 | { | |
945 | static atomic_t seq; | |
946 | struct sk_buff *skb; | |
947 | void *msg_head; | |
948 | int ret; | |
22dd4837 JK |
949 | int msg_size = 4 * nla_total_size(sizeof(u32)) + |
950 | 2 * nla_total_size(sizeof(u64)); | |
8e893469 JK |
951 | |
952 | /* We have to allocate using GFP_NOFS as we are called from a | |
953 | * filesystem performing write and thus further recursion into | |
954 | * the fs to free some data could cause deadlocks. */ | |
22dd4837 | 955 | skb = genlmsg_new(msg_size, GFP_NOFS); |
8e893469 JK |
956 | if (!skb) { |
957 | printk(KERN_ERR | |
958 | "VFS: Not enough memory to send quota warning.\n"); | |
959 | return; | |
960 | } | |
961 | msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), | |
962 | "a_genl_family, 0, QUOTA_NL_C_WARNING); | |
963 | if (!msg_head) { | |
964 | printk(KERN_ERR | |
965 | "VFS: Cannot store netlink header in quota warning.\n"); | |
966 | goto err_out; | |
967 | } | |
968 | ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type); | |
969 | if (ret) | |
970 | goto attr_err_out; | |
971 | ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id); | |
972 | if (ret) | |
973 | goto attr_err_out; | |
974 | ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); | |
975 | if (ret) | |
976 | goto attr_err_out; | |
977 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, | |
978 | MAJOR(dquot->dq_sb->s_dev)); | |
979 | if (ret) | |
980 | goto attr_err_out; | |
981 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, | |
982 | MINOR(dquot->dq_sb->s_dev)); | |
983 | if (ret) | |
984 | goto attr_err_out; | |
985 | ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current->user->uid); | |
986 | if (ret) | |
987 | goto attr_err_out; | |
988 | genlmsg_end(skb, msg_head); | |
989 | ||
990 | ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); | |
991 | if (ret < 0 && ret != -ESRCH) | |
992 | printk(KERN_ERR | |
993 | "VFS: Failed to send notification message: %d\n", ret); | |
994 | return; | |
995 | attr_err_out: | |
22dd4837 | 996 | printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); |
8e893469 JK |
997 | err_out: |
998 | kfree_skb(skb); | |
999 | } | |
1000 | #endif | |
1da177e4 | 1001 | |
087ee8d5 | 1002 | static inline void flush_warnings(struct dquot * const *dquots, char *warntype) |
1da177e4 LT |
1003 | { |
1004 | int i; | |
1005 | ||
1006 | for (i = 0; i < MAXQUOTAS; i++) | |
c525460e JK |
1007 | if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN && |
1008 | !warning_issued(dquots[i], warntype[i])) { | |
8e893469 | 1009 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 1010 | print_warning(dquots[i], warntype[i]); |
8e893469 JK |
1011 | #endif |
1012 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
1013 | send_warning(dquots[i], warntype[i]); | |
1014 | #endif | |
1015 | } | |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | static inline char ignore_hardlimit(struct dquot *dquot) | |
1019 | { | |
1020 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; | |
1021 | ||
1022 | return capable(CAP_SYS_RESOURCE) && | |
1023 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH)); | |
1024 | } | |
1025 | ||
1026 | /* needs dq_data_lock */ | |
1027 | static int check_idq(struct dquot *dquot, ulong inodes, char *warntype) | |
1028 | { | |
8e893469 | 1029 | *warntype = QUOTA_NL_NOWARN; |
1da177e4 LT |
1030 | if (inodes <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
1031 | return QUOTA_OK; | |
1032 | ||
1033 | if (dquot->dq_dqb.dqb_ihardlimit && | |
1034 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit && | |
1035 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1036 | *warntype = QUOTA_NL_IHARDWARN; |
1da177e4 LT |
1037 | return NO_QUOTA; |
1038 | } | |
1039 | ||
1040 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1041 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1042 | dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1043 | !ignore_hardlimit(dquot)) { | |
8e893469 | 1044 | *warntype = QUOTA_NL_ISOFTLONGWARN; |
1da177e4 LT |
1045 | return NO_QUOTA; |
1046 | } | |
1047 | ||
1048 | if (dquot->dq_dqb.dqb_isoftlimit && | |
1049 | (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && | |
1050 | dquot->dq_dqb.dqb_itime == 0) { | |
8e893469 | 1051 | *warntype = QUOTA_NL_ISOFTWARN; |
1da177e4 LT |
1052 | dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; |
1053 | } | |
1054 | ||
1055 | return QUOTA_OK; | |
1056 | } | |
1057 | ||
1058 | /* needs dq_data_lock */ | |
1059 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) | |
1060 | { | |
8e893469 | 1061 | *warntype = QUOTA_NL_NOWARN; |
1da177e4 LT |
1062 | if (space <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
1063 | return QUOTA_OK; | |
1064 | ||
1065 | if (dquot->dq_dqb.dqb_bhardlimit && | |
1066 | toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bhardlimit && | |
1067 | !ignore_hardlimit(dquot)) { | |
1068 | if (!prealloc) | |
8e893469 | 1069 | *warntype = QUOTA_NL_BHARDWARN; |
1da177e4 LT |
1070 | return NO_QUOTA; |
1071 | } | |
1072 | ||
1073 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
1074 | toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit && | |
1075 | dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1076 | !ignore_hardlimit(dquot)) { | |
1077 | if (!prealloc) | |
8e893469 | 1078 | *warntype = QUOTA_NL_BSOFTLONGWARN; |
1da177e4 LT |
1079 | return NO_QUOTA; |
1080 | } | |
1081 | ||
1082 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
1083 | toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit && | |
1084 | dquot->dq_dqb.dqb_btime == 0) { | |
1085 | if (!prealloc) { | |
8e893469 | 1086 | *warntype = QUOTA_NL_BSOFTWARN; |
1da177e4 LT |
1087 | dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace; |
1088 | } | |
1089 | else | |
1090 | /* | |
1091 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1092 | * be always printed | |
1093 | */ | |
1094 | return NO_QUOTA; | |
1095 | } | |
1096 | ||
1097 | return QUOTA_OK; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * Initialize quota pointers in inode | |
1102 | * Transaction must be started at entry | |
1103 | */ | |
1104 | int dquot_initialize(struct inode *inode, int type) | |
1105 | { | |
1106 | unsigned int id = 0; | |
1107 | int cnt, ret = 0; | |
1108 | ||
d3be915f IM |
1109 | /* First test before acquiring mutex - solves deadlocks when we |
1110 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1111 | if (IS_NOQUOTA(inode)) |
1112 | return 0; | |
1113 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1114 | /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ | |
1115 | if (IS_NOQUOTA(inode)) | |
1116 | goto out_err; | |
1117 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1118 | if (type != -1 && cnt != type) | |
1119 | continue; | |
1120 | if (inode->i_dquot[cnt] == NODQUOT) { | |
1121 | switch (cnt) { | |
1122 | case USRQUOTA: | |
1123 | id = inode->i_uid; | |
1124 | break; | |
1125 | case GRPQUOTA: | |
1126 | id = inode->i_gid; | |
1127 | break; | |
1128 | } | |
1129 | inode->i_dquot[cnt] = dqget(inode->i_sb, id, cnt); | |
1130 | } | |
1131 | } | |
1132 | out_err: | |
1133 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Release all quotas referenced by inode | |
1139 | * Transaction must be started at an entry | |
1140 | */ | |
1141 | int dquot_drop(struct inode *inode) | |
1142 | { | |
1143 | int cnt; | |
1144 | ||
1145 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1146 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1147 | if (inode->i_dquot[cnt] != NODQUOT) { | |
1148 | dqput(inode->i_dquot[cnt]); | |
1149 | inode->i_dquot[cnt] = NODQUOT; | |
1150 | } | |
1151 | } | |
1152 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1153 | return 0; | |
1154 | } | |
1155 | ||
b85f4b87 JK |
1156 | /* Wrapper to remove references to quota structures from inode */ |
1157 | void vfs_dq_drop(struct inode *inode) | |
1158 | { | |
1159 | /* Here we can get arbitrary inode from clear_inode() so we have | |
1160 | * to be careful. OTOH we don't need locking as quota operations | |
1161 | * are allowed to change only at mount time */ | |
1162 | if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op | |
1163 | && inode->i_sb->dq_op->drop) { | |
1164 | int cnt; | |
1165 | /* Test before calling to rule out calls from proc and such | |
1166 | * where we are not allowed to block. Note that this is | |
1167 | * actually reliable test even without the lock - the caller | |
1168 | * must assure that nobody can come after the DQUOT_DROP and | |
1169 | * add quota pointers back anyway */ | |
1170 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1171 | if (inode->i_dquot[cnt] != NODQUOT) | |
1172 | break; | |
1173 | if (cnt < MAXQUOTAS) | |
1174 | inode->i_sb->dq_op->drop(inode); | |
1175 | } | |
1176 | } | |
1177 | ||
1da177e4 LT |
1178 | /* |
1179 | * Following four functions update i_blocks+i_bytes fields and | |
1180 | * quota information (together with appropriate checks) | |
1181 | * NOTE: We absolutely rely on the fact that caller dirties | |
1182 | * the inode (usually macros in quotaops.h care about this) and | |
1183 | * holds a handle for the current transaction so that dquot write and | |
1184 | * inode write go into the same transaction. | |
1185 | */ | |
1186 | ||
1187 | /* | |
1188 | * This operation can block, but only after everything is updated | |
1189 | */ | |
1190 | int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) | |
1191 | { | |
1192 | int cnt, ret = NO_QUOTA; | |
1193 | char warntype[MAXQUOTAS]; | |
1194 | ||
d3be915f IM |
1195 | /* First test before acquiring mutex - solves deadlocks when we |
1196 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1197 | if (IS_NOQUOTA(inode)) { |
1198 | out_add: | |
1199 | inode_add_bytes(inode, number); | |
1200 | return QUOTA_OK; | |
1201 | } | |
1202 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1203 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1204 | |
1205 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1206 | if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */ | |
1207 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1208 | goto out_add; | |
1209 | } | |
1210 | spin_lock(&dq_data_lock); | |
1211 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1212 | if (inode->i_dquot[cnt] == NODQUOT) | |
1213 | continue; | |
1214 | if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA) | |
1215 | goto warn_put_all; | |
1216 | } | |
1217 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1218 | if (inode->i_dquot[cnt] == NODQUOT) | |
1219 | continue; | |
1220 | dquot_incr_space(inode->i_dquot[cnt], number); | |
1221 | } | |
1222 | inode_add_bytes(inode, number); | |
1223 | ret = QUOTA_OK; | |
1224 | warn_put_all: | |
1225 | spin_unlock(&dq_data_lock); | |
1226 | if (ret == QUOTA_OK) | |
1227 | /* Dirtify all the dquots - this can block when journalling */ | |
1228 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1229 | if (inode->i_dquot[cnt]) | |
1230 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1231 | flush_warnings(inode->i_dquot, warntype); | |
1232 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1233 | return ret; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * This operation can block, but only after everything is updated | |
1238 | */ | |
1239 | int dquot_alloc_inode(const struct inode *inode, unsigned long number) | |
1240 | { | |
1241 | int cnt, ret = NO_QUOTA; | |
1242 | char warntype[MAXQUOTAS]; | |
1243 | ||
d3be915f IM |
1244 | /* First test before acquiring mutex - solves deadlocks when we |
1245 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1246 | if (IS_NOQUOTA(inode)) |
1247 | return QUOTA_OK; | |
1248 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
8e893469 | 1249 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1250 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1251 | if (IS_NOQUOTA(inode)) { | |
1252 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1253 | return QUOTA_OK; | |
1254 | } | |
1255 | spin_lock(&dq_data_lock); | |
1256 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1257 | if (inode->i_dquot[cnt] == NODQUOT) | |
1258 | continue; | |
1259 | if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA) | |
1260 | goto warn_put_all; | |
1261 | } | |
1262 | ||
1263 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1264 | if (inode->i_dquot[cnt] == NODQUOT) | |
1265 | continue; | |
1266 | dquot_incr_inodes(inode->i_dquot[cnt], number); | |
1267 | } | |
1268 | ret = QUOTA_OK; | |
1269 | warn_put_all: | |
1270 | spin_unlock(&dq_data_lock); | |
1271 | if (ret == QUOTA_OK) | |
1272 | /* Dirtify all the dquots - this can block when journalling */ | |
1273 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1274 | if (inode->i_dquot[cnt]) | |
1275 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
087ee8d5 | 1276 | flush_warnings(inode->i_dquot, warntype); |
1da177e4 LT |
1277 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
1278 | return ret; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * This operation can block, but only after everything is updated | |
1283 | */ | |
1284 | int dquot_free_space(struct inode *inode, qsize_t number) | |
1285 | { | |
1286 | unsigned int cnt; | |
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 | out_sub: | |
1292 | inode_sub_bytes(inode, number); | |
1293 | return QUOTA_OK; | |
1294 | } | |
1295 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1296 | /* Now recheck reliably when holding dqptr_sem */ | |
1297 | if (IS_NOQUOTA(inode)) { | |
1298 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1299 | goto out_sub; | |
1300 | } | |
1301 | spin_lock(&dq_data_lock); | |
1302 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1303 | if (inode->i_dquot[cnt] == NODQUOT) | |
1304 | continue; | |
1305 | dquot_decr_space(inode->i_dquot[cnt], number); | |
1306 | } | |
1307 | inode_sub_bytes(inode, number); | |
1308 | spin_unlock(&dq_data_lock); | |
1309 | /* Dirtify all the dquots - this can block when journalling */ | |
1310 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1311 | if (inode->i_dquot[cnt]) | |
1312 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1313 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1314 | return QUOTA_OK; | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * This operation can block, but only after everything is updated | |
1319 | */ | |
1320 | int dquot_free_inode(const struct inode *inode, unsigned long number) | |
1321 | { | |
1322 | unsigned int cnt; | |
1323 | ||
d3be915f IM |
1324 | /* First test before acquiring mutex - solves deadlocks when we |
1325 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1326 | if (IS_NOQUOTA(inode)) |
1327 | return QUOTA_OK; | |
1328 | down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1329 | /* Now recheck reliably when holding dqptr_sem */ | |
1330 | if (IS_NOQUOTA(inode)) { | |
1331 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1332 | return QUOTA_OK; | |
1333 | } | |
1334 | spin_lock(&dq_data_lock); | |
1335 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1336 | if (inode->i_dquot[cnt] == NODQUOT) | |
1337 | continue; | |
1338 | dquot_decr_inodes(inode->i_dquot[cnt], number); | |
1339 | } | |
1340 | spin_unlock(&dq_data_lock); | |
1341 | /* Dirtify all the dquots - this can block when journalling */ | |
1342 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1343 | if (inode->i_dquot[cnt]) | |
1344 | mark_dquot_dirty(inode->i_dquot[cnt]); | |
1345 | up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1346 | return QUOTA_OK; | |
1347 | } | |
1348 | ||
1349 | /* | |
1350 | * Transfer the number of inode and blocks from one diskquota to an other. | |
1351 | * | |
1352 | * This operation can block, but only after everything is updated | |
1353 | * A transaction must be started when entering this function. | |
1354 | */ | |
1355 | int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
1356 | { | |
1357 | qsize_t space; | |
1358 | struct dquot *transfer_from[MAXQUOTAS]; | |
1359 | struct dquot *transfer_to[MAXQUOTAS]; | |
1360 | int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid, | |
1361 | chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid; | |
1362 | char warntype[MAXQUOTAS]; | |
1363 | ||
d3be915f IM |
1364 | /* First test before acquiring mutex - solves deadlocks when we |
1365 | * re-enter the quota code and are already holding the mutex */ | |
1da177e4 LT |
1366 | if (IS_NOQUOTA(inode)) |
1367 | return QUOTA_OK; | |
1368 | /* Clear the arrays */ | |
1369 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1370 | transfer_to[cnt] = transfer_from[cnt] = NODQUOT; | |
8e893469 | 1371 | warntype[cnt] = QUOTA_NL_NOWARN; |
1da177e4 LT |
1372 | } |
1373 | down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1374 | /* Now recheck reliably when holding dqptr_sem */ | |
1375 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ | |
1376 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1377 | return QUOTA_OK; | |
1378 | } | |
1379 | /* First build the transfer_to list - here we can block on | |
1380 | * reading/instantiating of dquots. We know that the transaction for | |
1381 | * us was already started so we don't violate lock ranking here */ | |
1382 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1383 | switch (cnt) { | |
1384 | case USRQUOTA: | |
1385 | if (!chuid) | |
1386 | continue; | |
1387 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt); | |
1388 | break; | |
1389 | case GRPQUOTA: | |
1390 | if (!chgid) | |
1391 | continue; | |
1392 | transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt); | |
1393 | break; | |
1394 | } | |
1395 | } | |
1396 | spin_lock(&dq_data_lock); | |
1397 | space = inode_get_bytes(inode); | |
1398 | /* Build the transfer_from list and check the limits */ | |
1399 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1400 | if (transfer_to[cnt] == NODQUOT) | |
1401 | continue; | |
1402 | transfer_from[cnt] = inode->i_dquot[cnt]; | |
1403 | if (check_idq(transfer_to[cnt], 1, warntype+cnt) == NO_QUOTA || | |
1404 | check_bdq(transfer_to[cnt], space, 0, warntype+cnt) == NO_QUOTA) | |
1405 | goto warn_put_all; | |
1406 | } | |
1407 | ||
1408 | /* | |
1409 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1410 | */ | |
1411 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1412 | /* | |
1413 | * Skip changes for same uid or gid or for turned off quota-type. | |
1414 | */ | |
1415 | if (transfer_to[cnt] == NODQUOT) | |
1416 | continue; | |
1417 | ||
1418 | /* Due to IO error we might not have transfer_from[] structure */ | |
1419 | if (transfer_from[cnt]) { | |
1420 | dquot_decr_inodes(transfer_from[cnt], 1); | |
1421 | dquot_decr_space(transfer_from[cnt], space); | |
1422 | } | |
1423 | ||
1424 | dquot_incr_inodes(transfer_to[cnt], 1); | |
1425 | dquot_incr_space(transfer_to[cnt], space); | |
1426 | ||
1427 | inode->i_dquot[cnt] = transfer_to[cnt]; | |
1428 | } | |
1429 | ret = QUOTA_OK; | |
1430 | warn_put_all: | |
1431 | spin_unlock(&dq_data_lock); | |
1432 | /* Dirtify all the dquots - this can block when journalling */ | |
1433 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1434 | if (transfer_from[cnt]) | |
1435 | mark_dquot_dirty(transfer_from[cnt]); | |
1436 | if (transfer_to[cnt]) | |
1437 | mark_dquot_dirty(transfer_to[cnt]); | |
1438 | } | |
1439 | flush_warnings(transfer_to, warntype); | |
1440 | ||
1441 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1442 | if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT) | |
1443 | dqput(transfer_from[cnt]); | |
1444 | if (ret == NO_QUOTA && transfer_to[cnt] != NODQUOT) | |
1445 | dqput(transfer_to[cnt]); | |
1446 | } | |
1447 | up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); | |
1448 | return ret; | |
1449 | } | |
1450 | ||
b85f4b87 JK |
1451 | /* Wrapper for transferring ownership of an inode */ |
1452 | int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) | |
1453 | { | |
1454 | if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) { | |
1455 | vfs_dq_init(inode); | |
1456 | if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) | |
1457 | return 1; | |
1458 | } | |
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | ||
1da177e4 LT |
1463 | /* |
1464 | * Write info of quota file to disk | |
1465 | */ | |
1466 | int dquot_commit_info(struct super_block *sb, int type) | |
1467 | { | |
1468 | int ret; | |
1469 | struct quota_info *dqopt = sb_dqopt(sb); | |
1470 | ||
d3be915f | 1471 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1472 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1473 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1474 | return ret; |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Definitions of diskquota operations. | |
1479 | */ | |
1480 | struct dquot_operations dquot_operations = { | |
1481 | .initialize = dquot_initialize, | |
1482 | .drop = dquot_drop, | |
1483 | .alloc_space = dquot_alloc_space, | |
1484 | .alloc_inode = dquot_alloc_inode, | |
1485 | .free_space = dquot_free_space, | |
1486 | .free_inode = dquot_free_inode, | |
1487 | .transfer = dquot_transfer, | |
1488 | .write_dquot = dquot_commit, | |
1489 | .acquire_dquot = dquot_acquire, | |
1490 | .release_dquot = dquot_release, | |
1491 | .mark_dirty = dquot_mark_dquot_dirty, | |
1492 | .write_info = dquot_commit_info | |
1493 | }; | |
1494 | ||
1495 | static inline void set_enable_flags(struct quota_info *dqopt, int type) | |
1496 | { | |
1497 | switch (type) { | |
1498 | case USRQUOTA: | |
1499 | dqopt->flags |= DQUOT_USR_ENABLED; | |
0ff5af83 | 1500 | dqopt->flags &= ~DQUOT_USR_SUSPENDED; |
1da177e4 LT |
1501 | break; |
1502 | case GRPQUOTA: | |
1503 | dqopt->flags |= DQUOT_GRP_ENABLED; | |
0ff5af83 | 1504 | dqopt->flags &= ~DQUOT_GRP_SUSPENDED; |
1da177e4 LT |
1505 | break; |
1506 | } | |
1507 | } | |
1508 | ||
0ff5af83 JK |
1509 | static inline void reset_enable_flags(struct quota_info *dqopt, int type, |
1510 | int remount) | |
1da177e4 LT |
1511 | { |
1512 | switch (type) { | |
1513 | case USRQUOTA: | |
1514 | dqopt->flags &= ~DQUOT_USR_ENABLED; | |
0ff5af83 JK |
1515 | if (remount) |
1516 | dqopt->flags |= DQUOT_USR_SUSPENDED; | |
1517 | else | |
1518 | dqopt->flags &= ~DQUOT_USR_SUSPENDED; | |
1da177e4 LT |
1519 | break; |
1520 | case GRPQUOTA: | |
1521 | dqopt->flags &= ~DQUOT_GRP_ENABLED; | |
0ff5af83 JK |
1522 | if (remount) |
1523 | dqopt->flags |= DQUOT_GRP_SUSPENDED; | |
1524 | else | |
1525 | dqopt->flags &= ~DQUOT_GRP_SUSPENDED; | |
1da177e4 LT |
1526 | break; |
1527 | } | |
1528 | } | |
1529 | ||
0ff5af83 | 1530 | |
1da177e4 LT |
1531 | /* |
1532 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1533 | */ | |
0ff5af83 | 1534 | int vfs_quota_off(struct super_block *sb, int type, int remount) |
1da177e4 | 1535 | { |
0ff5af83 | 1536 | int cnt, ret = 0; |
1da177e4 LT |
1537 | struct quota_info *dqopt = sb_dqopt(sb); |
1538 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 LT |
1539 | |
1540 | /* We need to serialize quota_off() for device */ | |
d3be915f | 1541 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
1542 | |
1543 | /* | |
1544 | * Skip everything if there's nothing to do. We have to do this because | |
1545 | * sometimes we are called when fill_super() failed and calling | |
1546 | * sync_fs() in such cases does no good. | |
1547 | */ | |
1548 | if (!sb_any_quota_enabled(sb) && !sb_any_quota_suspended(sb)) { | |
1549 | mutex_unlock(&dqopt->dqonoff_mutex); | |
1550 | return 0; | |
1551 | } | |
1da177e4 LT |
1552 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1553 | toputinode[cnt] = NULL; | |
1da177e4 LT |
1554 | if (type != -1 && cnt != type) |
1555 | continue; | |
0ff5af83 JK |
1556 | /* If we keep inodes of quota files after remount and quotaoff |
1557 | * is called, drop kept inodes. */ | |
1558 | if (!remount && sb_has_quota_suspended(sb, cnt)) { | |
1559 | iput(dqopt->files[cnt]); | |
1560 | dqopt->files[cnt] = NULL; | |
1561 | reset_enable_flags(dqopt, cnt, 0); | |
1562 | continue; | |
1563 | } | |
1da177e4 LT |
1564 | if (!sb_has_quota_enabled(sb, cnt)) |
1565 | continue; | |
0ff5af83 | 1566 | reset_enable_flags(dqopt, cnt, remount); |
1da177e4 LT |
1567 | |
1568 | /* Note: these are blocking operations */ | |
1569 | drop_dquot_ref(sb, cnt); | |
1570 | invalidate_dquots(sb, cnt); | |
1571 | /* | |
1572 | * Now all dquots should be invalidated, all writes done so we should be only | |
1573 | * users of the info. No locks needed. | |
1574 | */ | |
1575 | if (info_dirty(&dqopt->info[cnt])) | |
1576 | sb->dq_op->write_info(sb, cnt); | |
1577 | if (dqopt->ops[cnt]->free_file_info) | |
1578 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
1579 | put_quota_format(dqopt->info[cnt].dqi_format); | |
1580 | ||
1581 | toputinode[cnt] = dqopt->files[cnt]; | |
0ff5af83 JK |
1582 | if (!remount) |
1583 | dqopt->files[cnt] = NULL; | |
1da177e4 LT |
1584 | dqopt->info[cnt].dqi_flags = 0; |
1585 | dqopt->info[cnt].dqi_igrace = 0; | |
1586 | dqopt->info[cnt].dqi_bgrace = 0; | |
1587 | dqopt->ops[cnt] = NULL; | |
1588 | } | |
d3be915f | 1589 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 1590 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 1591 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
1592 | if (sb->s_op->sync_fs) |
1593 | sb->s_op->sync_fs(sb, 1); | |
1594 | sync_blockdev(sb->s_bdev); | |
1595 | /* Now the quota files are just ordinary files and we can set the | |
1596 | * inode flags back. Moreover we discard the pagecache so that | |
1597 | * userspace sees the writes we did bypassing the pagecache. We | |
1598 | * must also discard the blockdev buffers so that we see the | |
1599 | * changes done by userspace on the next quotaon() */ | |
1600 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
1601 | if (toputinode[cnt]) { | |
d3be915f | 1602 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1603 | /* If quota was reenabled in the meantime, we have |
1604 | * nothing to do */ | |
1605 | if (!sb_has_quota_enabled(sb, cnt)) { | |
7925409e | 1606 | mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1607 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
1608 | S_NOATIME | S_NOQUOTA); | |
1609 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); | |
1b1dcc1b | 1610 | mutex_unlock(&toputinode[cnt]->i_mutex); |
1da177e4 | 1611 | mark_inode_dirty(toputinode[cnt]); |
1da177e4 | 1612 | } |
d3be915f | 1613 | mutex_unlock(&dqopt->dqonoff_mutex); |
0ff5af83 JK |
1614 | /* On remount RO, we keep the inode pointer so that we |
1615 | * can reenable quota on the subsequent remount RW. | |
1616 | * But we have better not keep inode pointer when there | |
1617 | * is pending delete on the quota file... */ | |
1618 | if (!remount) | |
1619 | iput(toputinode[cnt]); | |
1620 | else if (!toputinode[cnt]->i_nlink) | |
1621 | ret = -EBUSY; | |
1da177e4 LT |
1622 | } |
1623 | if (sb->s_bdev) | |
f98393a6 | 1624 | invalidate_bdev(sb->s_bdev); |
0ff5af83 | 1625 | return ret; |
1da177e4 LT |
1626 | } |
1627 | ||
1628 | /* | |
1629 | * Turn quotas on on a device | |
1630 | */ | |
1631 | ||
1632 | /* Helper function when we already have the inode */ | |
1633 | static int vfs_quota_on_inode(struct inode *inode, int type, int format_id) | |
1634 | { | |
1635 | struct quota_format_type *fmt = find_quota_format(format_id); | |
1636 | struct super_block *sb = inode->i_sb; | |
1637 | struct quota_info *dqopt = sb_dqopt(sb); | |
1638 | int error; | |
1639 | int oldflags = -1; | |
1640 | ||
1641 | if (!fmt) | |
1642 | return -ESRCH; | |
1643 | if (!S_ISREG(inode->i_mode)) { | |
1644 | error = -EACCES; | |
1645 | goto out_fmt; | |
1646 | } | |
1647 | if (IS_RDONLY(inode)) { | |
1648 | error = -EROFS; | |
1649 | goto out_fmt; | |
1650 | } | |
1651 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
1652 | error = -EINVAL; | |
1653 | goto out_fmt; | |
1654 | } | |
1655 | ||
1656 | /* As we bypass the pagecache we must now flush the inode so that | |
1657 | * we see all the changes from userspace... */ | |
1658 | write_inode_now(inode, 1); | |
1659 | /* And now flush the block cache so that kernel sees the changes */ | |
f98393a6 | 1660 | invalidate_bdev(sb->s_bdev); |
1b1dcc1b | 1661 | mutex_lock(&inode->i_mutex); |
d3be915f | 1662 | mutex_lock(&dqopt->dqonoff_mutex); |
0ff5af83 JK |
1663 | if (sb_has_quota_enabled(sb, type) || |
1664 | sb_has_quota_suspended(sb, type)) { | |
1da177e4 LT |
1665 | error = -EBUSY; |
1666 | goto out_lock; | |
1667 | } | |
1668 | /* We don't want quota and atime on quota files (deadlocks possible) | |
1669 | * Also nobody should write to the file - we use special IO operations | |
1670 | * which ignore the immutable bit. */ | |
1671 | down_write(&dqopt->dqptr_sem); | |
1672 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA); | |
1673 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; | |
1674 | up_write(&dqopt->dqptr_sem); | |
31e7ad6a | 1675 | sb->dq_op->drop(inode); |
1da177e4 LT |
1676 | |
1677 | error = -EIO; | |
1678 | dqopt->files[type] = igrab(inode); | |
1679 | if (!dqopt->files[type]) | |
1680 | goto out_lock; | |
1681 | error = -EINVAL; | |
1682 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
1683 | goto out_file_init; | |
1684 | ||
1685 | dqopt->ops[type] = fmt->qf_ops; | |
1686 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 1687 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 1688 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 1689 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1690 | if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) { |
d3be915f | 1691 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1692 | goto out_file_init; |
1693 | } | |
d3be915f | 1694 | mutex_unlock(&dqopt->dqio_mutex); |
1b1dcc1b | 1695 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1696 | set_enable_flags(dqopt, type); |
1697 | ||
1698 | add_dquot_ref(sb, type); | |
d3be915f | 1699 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1700 | |
1701 | return 0; | |
1702 | ||
1703 | out_file_init: | |
1704 | dqopt->files[type] = NULL; | |
1705 | iput(inode); | |
1706 | out_lock: | |
d3be915f | 1707 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
1708 | if (oldflags != -1) { |
1709 | down_write(&dqopt->dqptr_sem); | |
1710 | /* Set the flags back (in the case of accidental quotaon() | |
1711 | * on a wrong file we don't want to mess up the flags) */ | |
1712 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
1713 | inode->i_flags |= oldflags; | |
1714 | up_write(&dqopt->dqptr_sem); | |
1715 | } | |
1b1dcc1b | 1716 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1717 | out_fmt: |
1718 | put_quota_format(fmt); | |
1719 | ||
1720 | return error; | |
1721 | } | |
1722 | ||
0ff5af83 JK |
1723 | /* Reenable quotas on remount RW */ |
1724 | static int vfs_quota_on_remount(struct super_block *sb, int type) | |
1725 | { | |
1726 | struct quota_info *dqopt = sb_dqopt(sb); | |
1727 | struct inode *inode; | |
1728 | int ret; | |
1729 | ||
1730 | mutex_lock(&dqopt->dqonoff_mutex); | |
1731 | if (!sb_has_quota_suspended(sb, type)) { | |
1732 | mutex_unlock(&dqopt->dqonoff_mutex); | |
1733 | return 0; | |
1734 | } | |
1735 | BUG_ON(sb_has_quota_enabled(sb, type)); | |
1736 | ||
1737 | inode = dqopt->files[type]; | |
1738 | dqopt->files[type] = NULL; | |
1739 | reset_enable_flags(dqopt, type, 0); | |
1740 | mutex_unlock(&dqopt->dqonoff_mutex); | |
1741 | ||
1742 | ret = vfs_quota_on_inode(inode, type, dqopt->info[type].dqi_fmt_id); | |
1743 | iput(inode); | |
1744 | ||
1745 | return ret; | |
1746 | } | |
1747 | ||
1da177e4 | 1748 | /* Actual function called from quotactl() */ |
0ff5af83 JK |
1749 | int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path, |
1750 | int remount) | |
1da177e4 LT |
1751 | { |
1752 | struct nameidata nd; | |
1753 | int error; | |
1754 | ||
0ff5af83 JK |
1755 | if (remount) |
1756 | return vfs_quota_on_remount(sb, type); | |
1757 | ||
1da177e4 LT |
1758 | error = path_lookup(path, LOOKUP_FOLLOW, &nd); |
1759 | if (error < 0) | |
1760 | return error; | |
4ac91378 | 1761 | error = security_quota_on(nd.path.dentry); |
1da177e4 LT |
1762 | if (error) |
1763 | goto out_path; | |
1764 | /* Quota file not on the same filesystem? */ | |
4ac91378 | 1765 | if (nd.path.mnt->mnt_sb != sb) |
1da177e4 | 1766 | error = -EXDEV; |
7b7b1ace | 1767 | else |
4ac91378 JB |
1768 | error = vfs_quota_on_inode(nd.path.dentry->d_inode, type, |
1769 | format_id); | |
1da177e4 | 1770 | out_path: |
1d957f9b | 1771 | path_put(&nd.path); |
1da177e4 LT |
1772 | return error; |
1773 | } | |
1774 | ||
1775 | /* | |
1776 | * This function is used when filesystem needs to initialize quotas | |
1777 | * during mount time. | |
1778 | */ | |
84de856e CH |
1779 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
1780 | int format_id, int type) | |
1da177e4 | 1781 | { |
84de856e | 1782 | struct dentry *dentry; |
1da177e4 LT |
1783 | int error; |
1784 | ||
2fa389c5 | 1785 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
1786 | if (IS_ERR(dentry)) |
1787 | return PTR_ERR(dentry); | |
1788 | ||
154f484b JK |
1789 | if (!dentry->d_inode) { |
1790 | error = -ENOENT; | |
1791 | goto out; | |
1792 | } | |
1793 | ||
1da177e4 | 1794 | error = security_quota_on(dentry); |
84de856e CH |
1795 | if (!error) |
1796 | error = vfs_quota_on_inode(dentry->d_inode, type, format_id); | |
1797 | ||
154f484b | 1798 | out: |
84de856e CH |
1799 | dput(dentry); |
1800 | return error; | |
1da177e4 LT |
1801 | } |
1802 | ||
b85f4b87 JK |
1803 | /* Wrapper to turn on quotas when remounting rw */ |
1804 | int vfs_dq_quota_on_remount(struct super_block *sb) | |
1805 | { | |
1806 | int cnt; | |
1807 | int ret = 0, err; | |
1808 | ||
1809 | if (!sb->s_qcop || !sb->s_qcop->quota_on) | |
1810 | return -ENOSYS; | |
1811 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1812 | err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); | |
1813 | if (err < 0 && !ret) | |
1814 | ret = err; | |
1815 | } | |
1816 | return ret; | |
1817 | } | |
1818 | ||
1da177e4 LT |
1819 | /* Generic routine for getting common part of quota structure */ |
1820 | static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) | |
1821 | { | |
1822 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
1823 | ||
1824 | spin_lock(&dq_data_lock); | |
1825 | di->dqb_bhardlimit = dm->dqb_bhardlimit; | |
1826 | di->dqb_bsoftlimit = dm->dqb_bsoftlimit; | |
1827 | di->dqb_curspace = dm->dqb_curspace; | |
1828 | di->dqb_ihardlimit = dm->dqb_ihardlimit; | |
1829 | di->dqb_isoftlimit = dm->dqb_isoftlimit; | |
1830 | di->dqb_curinodes = dm->dqb_curinodes; | |
1831 | di->dqb_btime = dm->dqb_btime; | |
1832 | di->dqb_itime = dm->dqb_itime; | |
1833 | di->dqb_valid = QIF_ALL; | |
1834 | spin_unlock(&dq_data_lock); | |
1835 | } | |
1836 | ||
1837 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
1838 | { | |
1839 | struct dquot *dquot; | |
1840 | ||
d3be915f | 1841 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 | 1842 | if (!(dquot = dqget(sb, id, type))) { |
d3be915f | 1843 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1844 | return -ESRCH; |
1845 | } | |
1846 | do_get_dqblk(dquot, di); | |
1847 | dqput(dquot); | |
d3be915f | 1848 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1849 | return 0; |
1850 | } | |
1851 | ||
1852 | /* Generic routine for setting common part of quota structure */ | |
338bf9af | 1853 | static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) |
1da177e4 LT |
1854 | { |
1855 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
1856 | int check_blim = 0, check_ilim = 0; | |
338bf9af AP |
1857 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; |
1858 | ||
1859 | if ((di->dqb_valid & QIF_BLIMITS && | |
1860 | (di->dqb_bhardlimit > dqi->dqi_maxblimit || | |
1861 | di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || | |
1862 | (di->dqb_valid & QIF_ILIMITS && | |
1863 | (di->dqb_ihardlimit > dqi->dqi_maxilimit || | |
1864 | di->dqb_isoftlimit > dqi->dqi_maxilimit))) | |
1865 | return -ERANGE; | |
1da177e4 LT |
1866 | |
1867 | spin_lock(&dq_data_lock); | |
1868 | if (di->dqb_valid & QIF_SPACE) { | |
1869 | dm->dqb_curspace = di->dqb_curspace; | |
1870 | check_blim = 1; | |
1871 | } | |
1872 | if (di->dqb_valid & QIF_BLIMITS) { | |
1873 | dm->dqb_bsoftlimit = di->dqb_bsoftlimit; | |
1874 | dm->dqb_bhardlimit = di->dqb_bhardlimit; | |
1875 | check_blim = 1; | |
1876 | } | |
1877 | if (di->dqb_valid & QIF_INODES) { | |
1878 | dm->dqb_curinodes = di->dqb_curinodes; | |
1879 | check_ilim = 1; | |
1880 | } | |
1881 | if (di->dqb_valid & QIF_ILIMITS) { | |
1882 | dm->dqb_isoftlimit = di->dqb_isoftlimit; | |
1883 | dm->dqb_ihardlimit = di->dqb_ihardlimit; | |
1884 | check_ilim = 1; | |
1885 | } | |
1886 | if (di->dqb_valid & QIF_BTIME) | |
1887 | dm->dqb_btime = di->dqb_btime; | |
1888 | if (di->dqb_valid & QIF_ITIME) | |
1889 | dm->dqb_itime = di->dqb_itime; | |
1890 | ||
1891 | if (check_blim) { | |
1892 | if (!dm->dqb_bsoftlimit || toqb(dm->dqb_curspace) < dm->dqb_bsoftlimit) { | |
1893 | dm->dqb_btime = 0; | |
1894 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1895 | } | |
1896 | else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 1897 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
1898 | } |
1899 | if (check_ilim) { | |
1900 | if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1901 | dm->dqb_itime = 0; | |
1902 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1903 | } | |
1904 | else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */ | |
338bf9af | 1905 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 LT |
1906 | } |
1907 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit) | |
1908 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); | |
1909 | else | |
1910 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
1911 | spin_unlock(&dq_data_lock); | |
1912 | mark_dquot_dirty(dquot); | |
338bf9af AP |
1913 | |
1914 | return 0; | |
1da177e4 LT |
1915 | } |
1916 | ||
1917 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) | |
1918 | { | |
1919 | struct dquot *dquot; | |
338bf9af | 1920 | int rc; |
1da177e4 | 1921 | |
d3be915f | 1922 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 | 1923 | if (!(dquot = dqget(sb, id, type))) { |
d3be915f | 1924 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1925 | return -ESRCH; |
1926 | } | |
338bf9af | 1927 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 1928 | dqput(dquot); |
d3be915f | 1929 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
338bf9af | 1930 | return rc; |
1da177e4 LT |
1931 | } |
1932 | ||
1933 | /* Generic routine for getting common part of quota file information */ | |
1934 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
1935 | { | |
1936 | struct mem_dqinfo *mi; | |
1937 | ||
d3be915f | 1938 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 | 1939 | if (!sb_has_quota_enabled(sb, type)) { |
d3be915f | 1940 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1941 | return -ESRCH; |
1942 | } | |
1943 | mi = sb_dqopt(sb)->info + type; | |
1944 | spin_lock(&dq_data_lock); | |
1945 | ii->dqi_bgrace = mi->dqi_bgrace; | |
1946 | ii->dqi_igrace = mi->dqi_igrace; | |
1947 | ii->dqi_flags = mi->dqi_flags & DQF_MASK; | |
1948 | ii->dqi_valid = IIF_ALL; | |
1949 | spin_unlock(&dq_data_lock); | |
d3be915f | 1950 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1951 | return 0; |
1952 | } | |
1953 | ||
1954 | /* Generic routine for setting common part of quota file information */ | |
1955 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) | |
1956 | { | |
1957 | struct mem_dqinfo *mi; | |
1958 | ||
d3be915f | 1959 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 | 1960 | if (!sb_has_quota_enabled(sb, type)) { |
d3be915f | 1961 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1962 | return -ESRCH; |
1963 | } | |
1964 | mi = sb_dqopt(sb)->info + type; | |
1965 | spin_lock(&dq_data_lock); | |
1966 | if (ii->dqi_valid & IIF_BGRACE) | |
1967 | mi->dqi_bgrace = ii->dqi_bgrace; | |
1968 | if (ii->dqi_valid & IIF_IGRACE) | |
1969 | mi->dqi_igrace = ii->dqi_igrace; | |
1970 | if (ii->dqi_valid & IIF_FLAGS) | |
1971 | mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK); | |
1972 | spin_unlock(&dq_data_lock); | |
1973 | mark_info_dirty(sb, type); | |
1974 | /* Force write to disk */ | |
1975 | sb->dq_op->write_info(sb, type); | |
d3be915f | 1976 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
1977 | return 0; |
1978 | } | |
1979 | ||
1980 | struct quotactl_ops vfs_quotactl_ops = { | |
1981 | .quota_on = vfs_quota_on, | |
1982 | .quota_off = vfs_quota_off, | |
1983 | .quota_sync = vfs_quota_sync, | |
1984 | .get_info = vfs_get_dqinfo, | |
1985 | .set_info = vfs_set_dqinfo, | |
1986 | .get_dqblk = vfs_get_dqblk, | |
1987 | .set_dqblk = vfs_set_dqblk | |
1988 | }; | |
1989 | ||
1990 | static ctl_table fs_dqstats_table[] = { | |
1991 | { | |
1992 | .ctl_name = FS_DQ_LOOKUPS, | |
1993 | .procname = "lookups", | |
1994 | .data = &dqstats.lookups, | |
1995 | .maxlen = sizeof(int), | |
1996 | .mode = 0444, | |
1997 | .proc_handler = &proc_dointvec, | |
1998 | }, | |
1999 | { | |
2000 | .ctl_name = FS_DQ_DROPS, | |
2001 | .procname = "drops", | |
2002 | .data = &dqstats.drops, | |
2003 | .maxlen = sizeof(int), | |
2004 | .mode = 0444, | |
2005 | .proc_handler = &proc_dointvec, | |
2006 | }, | |
2007 | { | |
2008 | .ctl_name = FS_DQ_READS, | |
2009 | .procname = "reads", | |
2010 | .data = &dqstats.reads, | |
2011 | .maxlen = sizeof(int), | |
2012 | .mode = 0444, | |
2013 | .proc_handler = &proc_dointvec, | |
2014 | }, | |
2015 | { | |
2016 | .ctl_name = FS_DQ_WRITES, | |
2017 | .procname = "writes", | |
2018 | .data = &dqstats.writes, | |
2019 | .maxlen = sizeof(int), | |
2020 | .mode = 0444, | |
2021 | .proc_handler = &proc_dointvec, | |
2022 | }, | |
2023 | { | |
2024 | .ctl_name = FS_DQ_CACHE_HITS, | |
2025 | .procname = "cache_hits", | |
2026 | .data = &dqstats.cache_hits, | |
2027 | .maxlen = sizeof(int), | |
2028 | .mode = 0444, | |
2029 | .proc_handler = &proc_dointvec, | |
2030 | }, | |
2031 | { | |
2032 | .ctl_name = FS_DQ_ALLOCATED, | |
2033 | .procname = "allocated_dquots", | |
2034 | .data = &dqstats.allocated_dquots, | |
2035 | .maxlen = sizeof(int), | |
2036 | .mode = 0444, | |
2037 | .proc_handler = &proc_dointvec, | |
2038 | }, | |
2039 | { | |
2040 | .ctl_name = FS_DQ_FREE, | |
2041 | .procname = "free_dquots", | |
2042 | .data = &dqstats.free_dquots, | |
2043 | .maxlen = sizeof(int), | |
2044 | .mode = 0444, | |
2045 | .proc_handler = &proc_dointvec, | |
2046 | }, | |
2047 | { | |
2048 | .ctl_name = FS_DQ_SYNCS, | |
2049 | .procname = "syncs", | |
2050 | .data = &dqstats.syncs, | |
2051 | .maxlen = sizeof(int), | |
2052 | .mode = 0444, | |
2053 | .proc_handler = &proc_dointvec, | |
2054 | }, | |
8e893469 | 2055 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
2056 | { |
2057 | .ctl_name = FS_DQ_WARNINGS, | |
2058 | .procname = "warnings", | |
2059 | .data = &flag_print_warnings, | |
2060 | .maxlen = sizeof(int), | |
2061 | .mode = 0644, | |
2062 | .proc_handler = &proc_dointvec, | |
2063 | }, | |
8e893469 | 2064 | #endif |
1da177e4 LT |
2065 | { .ctl_name = 0 }, |
2066 | }; | |
2067 | ||
2068 | static ctl_table fs_table[] = { | |
2069 | { | |
2070 | .ctl_name = FS_DQSTATS, | |
2071 | .procname = "quota", | |
2072 | .mode = 0555, | |
2073 | .child = fs_dqstats_table, | |
2074 | }, | |
2075 | { .ctl_name = 0 }, | |
2076 | }; | |
2077 | ||
2078 | static ctl_table sys_table[] = { | |
2079 | { | |
2080 | .ctl_name = CTL_FS, | |
2081 | .procname = "fs", | |
2082 | .mode = 0555, | |
2083 | .child = fs_table, | |
2084 | }, | |
2085 | { .ctl_name = 0 }, | |
2086 | }; | |
2087 | ||
2088 | static int __init dquot_init(void) | |
2089 | { | |
2090 | int i; | |
2091 | unsigned long nr_hash, order; | |
2092 | ||
2093 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2094 | ||
0b4d4147 | 2095 | register_sysctl_table(sys_table); |
1da177e4 | 2096 | |
20c2df83 | 2097 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2098 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2099 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2100 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2101 | NULL); |
1da177e4 LT |
2102 | |
2103 | order = 0; | |
2104 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2105 | if (!dquot_hash) | |
2106 | panic("Cannot create dquot hash table"); | |
2107 | ||
2108 | /* Find power-of-two hlist_heads which can fit into allocation */ | |
2109 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2110 | dq_hash_bits = 0; | |
2111 | do { | |
2112 | dq_hash_bits++; | |
2113 | } while (nr_hash >> dq_hash_bits); | |
2114 | dq_hash_bits--; | |
2115 | ||
2116 | nr_hash = 1UL << dq_hash_bits; | |
2117 | dq_hash_mask = nr_hash - 1; | |
2118 | for (i = 0; i < nr_hash; i++) | |
2119 | INIT_HLIST_HEAD(dquot_hash + i); | |
2120 | ||
2121 | printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", | |
2122 | nr_hash, order, (PAGE_SIZE << order)); | |
2123 | ||
8e1f936b | 2124 | register_shrinker(&dqcache_shrinker); |
1da177e4 | 2125 | |
8e893469 JK |
2126 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
2127 | if (genl_register_family("a_genl_family) != 0) | |
2128 | printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n"); | |
2129 | #endif | |
2130 | ||
1da177e4 LT |
2131 | return 0; |
2132 | } | |
2133 | module_init(dquot_init); | |
2134 | ||
2135 | EXPORT_SYMBOL(register_quota_format); | |
2136 | EXPORT_SYMBOL(unregister_quota_format); | |
2137 | EXPORT_SYMBOL(dqstats); | |
2138 | EXPORT_SYMBOL(dq_data_lock); | |
2139 | EXPORT_SYMBOL(vfs_quota_on); | |
2140 | EXPORT_SYMBOL(vfs_quota_on_mount); | |
2141 | EXPORT_SYMBOL(vfs_quota_off); | |
2142 | EXPORT_SYMBOL(vfs_quota_sync); | |
2143 | EXPORT_SYMBOL(vfs_get_dqinfo); | |
2144 | EXPORT_SYMBOL(vfs_set_dqinfo); | |
2145 | EXPORT_SYMBOL(vfs_get_dqblk); | |
2146 | EXPORT_SYMBOL(vfs_set_dqblk); | |
2147 | EXPORT_SYMBOL(dquot_commit); | |
2148 | EXPORT_SYMBOL(dquot_commit_info); | |
2149 | EXPORT_SYMBOL(dquot_acquire); | |
2150 | EXPORT_SYMBOL(dquot_release); | |
2151 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); | |
2152 | EXPORT_SYMBOL(dquot_initialize); | |
2153 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 2154 | EXPORT_SYMBOL(vfs_dq_drop); |
1da177e4 LT |
2155 | EXPORT_SYMBOL(dquot_alloc_space); |
2156 | EXPORT_SYMBOL(dquot_alloc_inode); | |
2157 | EXPORT_SYMBOL(dquot_free_space); | |
2158 | EXPORT_SYMBOL(dquot_free_inode); | |
2159 | EXPORT_SYMBOL(dquot_transfer); | |
b85f4b87 JK |
2160 | EXPORT_SYMBOL(vfs_dq_transfer); |
2161 | EXPORT_SYMBOL(vfs_dq_quota_on_remount); |