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> | |
40401530 | 74 | #include <linux/sched.h> |
1da177e4 LT |
75 | #include <linux/kmod.h> |
76 | #include <linux/namei.h> | |
16f7e0fe | 77 | #include <linux/capability.h> |
be586bab | 78 | #include <linux/quotaops.h> |
55fa6091 | 79 | #include "../internal.h" /* ugh */ |
1da177e4 | 80 | |
f3da9310 | 81 | #include <linux/uaccess.h> |
1da177e4 | 82 | |
1da177e4 | 83 | /* |
cc33412f | 84 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
dde95888 | 85 | * and quota formats. |
cc33412f JK |
86 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and |
87 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 88 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
89 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
90 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
91 | * about latest values take it as well. | |
1da177e4 | 92 | * |
cc33412f JK |
93 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
94 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
95 | * |
96 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
97 | * the life of the dquot structure and so needn't to be protected by a lock | |
98 | * | |
b9ba6f94 NY |
99 | * Operation accessing dquots via inode pointers are protected by dquot_srcu. |
100 | * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and | |
101 | * synchronize_srcu(&dquot_srcu) is called after clearing pointers from | |
102 | * inode and before dropping dquot references to avoid use of dquots after | |
103 | * they are freed. dq_data_lock is used to serialize the pointer setting and | |
104 | * clearing operations. | |
26245c94 JK |
105 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that |
106 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
b9ba6f94 NY |
107 | * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they |
108 | * have to do all pointer modifications before dropping dq_data_lock. This makes | |
26245c94 JK |
109 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and |
110 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 111 | * |
d3be915f | 112 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
113 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
114 | * Currently dquot is locked only when it is being read to memory (or space for | |
115 | * it is being allocated) on the first dqget() and when it is being released on | |
116 | * the last dqput(). The allocation and release oparations are serialized by | |
117 | * the dq_lock and by checking the use count in dquot_release(). Write | |
118 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
119 | * spinlock to internal buffers before writing. | |
120 | * | |
121 | * Lock ordering (including related VFS locks) is the following: | |
b9ba6f94 | 122 | * dqonoff_mutex > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex |
a80b12c3 | 123 | * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc. |
1da177e4 LT |
124 | */ |
125 | ||
c516610c JK |
126 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
127 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
128 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 129 | EXPORT_SYMBOL(dq_data_lock); |
b9ba6f94 | 130 | DEFINE_STATIC_SRCU(dquot_srcu); |
1da177e4 | 131 | |
fb5ffb0e | 132 | void __quota_error(struct super_block *sb, const char *func, |
055adcbd | 133 | const char *fmt, ...) |
fb5ffb0e | 134 | { |
fb5ffb0e | 135 | if (printk_ratelimit()) { |
055adcbd JP |
136 | va_list args; |
137 | struct va_format vaf; | |
138 | ||
fb5ffb0e | 139 | va_start(args, fmt); |
055adcbd JP |
140 | |
141 | vaf.fmt = fmt; | |
142 | vaf.va = &args; | |
143 | ||
144 | printk(KERN_ERR "Quota error (device %s): %s: %pV\n", | |
145 | sb->s_id, func, &vaf); | |
146 | ||
fb5ffb0e JZ |
147 | va_end(args); |
148 | } | |
149 | } | |
150 | EXPORT_SYMBOL(__quota_error); | |
151 | ||
da8d1ba2 | 152 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 153 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 154 | #endif |
1da177e4 LT |
155 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
156 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
157 | ||
158 | /* SLAB cache for dquot structures */ | |
e18b890b | 159 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
160 | |
161 | int register_quota_format(struct quota_format_type *fmt) | |
162 | { | |
163 | spin_lock(&dq_list_lock); | |
164 | fmt->qf_next = quota_formats; | |
165 | quota_formats = fmt; | |
166 | spin_unlock(&dq_list_lock); | |
167 | return 0; | |
168 | } | |
08d0350c | 169 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
170 | |
171 | void unregister_quota_format(struct quota_format_type *fmt) | |
172 | { | |
173 | struct quota_format_type **actqf; | |
174 | ||
175 | spin_lock(&dq_list_lock); | |
268157ba JK |
176 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
177 | actqf = &(*actqf)->qf_next) | |
178 | ; | |
1da177e4 LT |
179 | if (*actqf) |
180 | *actqf = (*actqf)->qf_next; | |
181 | spin_unlock(&dq_list_lock); | |
182 | } | |
08d0350c | 183 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
184 | |
185 | static struct quota_format_type *find_quota_format(int id) | |
186 | { | |
187 | struct quota_format_type *actqf; | |
188 | ||
189 | spin_lock(&dq_list_lock); | |
268157ba JK |
190 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
191 | actqf = actqf->qf_next) | |
192 | ; | |
1da177e4 LT |
193 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
194 | int qm; | |
195 | ||
196 | spin_unlock(&dq_list_lock); | |
197 | ||
268157ba JK |
198 | for (qm = 0; module_names[qm].qm_fmt_id && |
199 | module_names[qm].qm_fmt_id != id; qm++) | |
200 | ; | |
201 | if (!module_names[qm].qm_fmt_id || | |
202 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
203 | return NULL; |
204 | ||
205 | spin_lock(&dq_list_lock); | |
268157ba JK |
206 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
207 | actqf = actqf->qf_next) | |
208 | ; | |
1da177e4 LT |
209 | if (actqf && !try_module_get(actqf->qf_owner)) |
210 | actqf = NULL; | |
211 | } | |
212 | spin_unlock(&dq_list_lock); | |
213 | return actqf; | |
214 | } | |
215 | ||
216 | static void put_quota_format(struct quota_format_type *fmt) | |
217 | { | |
218 | module_put(fmt->qf_owner); | |
219 | } | |
220 | ||
221 | /* | |
222 | * Dquot List Management: | |
223 | * The quota code uses three lists for dquot management: the inuse_list, | |
224 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
225 | * on all three lists, depending on its current state. | |
226 | * | |
227 | * All dquots are placed to the end of inuse_list when first created, and this | |
228 | * list is used for invalidate operation, which must look at every dquot. | |
229 | * | |
230 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
231 | * and this list is searched whenever we need an available dquot. Dquots are | |
232 | * removed from the list as soon as they are used again, and | |
233 | * dqstats.free_dquots gives the number of dquots on the list. When | |
234 | * dquot is invalidated it's completely released from memory. | |
235 | * | |
236 | * Dquots with a specific identity (device, type and id) are placed on | |
237 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
238 | * mechanism to locate a specific dquot. | |
239 | */ | |
240 | ||
241 | static LIST_HEAD(inuse_list); | |
242 | static LIST_HEAD(free_dquots); | |
243 | static unsigned int dq_hash_bits, dq_hash_mask; | |
244 | static struct hlist_head *dquot_hash; | |
245 | ||
246 | struct dqstats dqstats; | |
08d0350c | 247 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 248 | |
0a5a9c72 | 249 | static qsize_t inode_get_rsv_space(struct inode *inode); |
871a2931 | 250 | static void __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 251 | |
1da177e4 | 252 | static inline unsigned int |
1a06d420 | 253 | hashfn(const struct super_block *sb, struct kqid qid) |
1da177e4 | 254 | { |
1a06d420 EB |
255 | unsigned int id = from_kqid(&init_user_ns, qid); |
256 | int type = qid.type; | |
1da177e4 LT |
257 | unsigned long tmp; |
258 | ||
259 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
260 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Following list functions expect dq_list_lock to be held | |
265 | */ | |
266 | static inline void insert_dquot_hash(struct dquot *dquot) | |
267 | { | |
268157ba | 268 | struct hlist_head *head; |
1a06d420 | 269 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); |
1da177e4 LT |
270 | hlist_add_head(&dquot->dq_hash, head); |
271 | } | |
272 | ||
273 | static inline void remove_dquot_hash(struct dquot *dquot) | |
274 | { | |
275 | hlist_del_init(&dquot->dq_hash); | |
276 | } | |
277 | ||
7a2435d8 | 278 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
1a06d420 | 279 | struct kqid qid) |
1da177e4 LT |
280 | { |
281 | struct hlist_node *node; | |
282 | struct dquot *dquot; | |
283 | ||
284 | hlist_for_each (node, dquot_hash+hashent) { | |
285 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
4c376dca | 286 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 LT |
287 | return dquot; |
288 | } | |
dd6f3c6d | 289 | return NULL; |
1da177e4 LT |
290 | } |
291 | ||
292 | /* Add a dquot to the tail of the free list */ | |
293 | static inline void put_dquot_last(struct dquot *dquot) | |
294 | { | |
8e13059a | 295 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 296 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
297 | } |
298 | ||
299 | static inline void remove_free_dquot(struct dquot *dquot) | |
300 | { | |
301 | if (list_empty(&dquot->dq_free)) | |
302 | return; | |
303 | list_del_init(&dquot->dq_free); | |
dde95888 | 304 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
305 | } |
306 | ||
307 | static inline void put_inuse(struct dquot *dquot) | |
308 | { | |
309 | /* We add to the back of inuse list so we don't have to restart | |
310 | * when traversing this list and we block */ | |
8e13059a | 311 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 312 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
313 | } |
314 | ||
315 | static inline void remove_inuse(struct dquot *dquot) | |
316 | { | |
dde95888 | 317 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
318 | list_del(&dquot->dq_inuse); |
319 | } | |
320 | /* | |
321 | * End of list functions needing dq_list_lock | |
322 | */ | |
323 | ||
324 | static void wait_on_dquot(struct dquot *dquot) | |
325 | { | |
d3be915f IM |
326 | mutex_lock(&dquot->dq_lock); |
327 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
328 | } |
329 | ||
03f6e92b JK |
330 | static inline int dquot_dirty(struct dquot *dquot) |
331 | { | |
332 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
333 | } | |
334 | ||
335 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
336 | { | |
337 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
338 | } | |
1da177e4 | 339 | |
eabf290d | 340 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
341 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
342 | { | |
eabf290d DM |
343 | int ret = 1; |
344 | ||
345 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ | |
346 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
347 | return 1; | |
348 | ||
1da177e4 | 349 | spin_lock(&dq_list_lock); |
eabf290d | 350 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 351 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 352 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
353 | ret = 0; |
354 | } | |
1da177e4 | 355 | spin_unlock(&dq_list_lock); |
eabf290d | 356 | return ret; |
1da177e4 | 357 | } |
08d0350c | 358 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 359 | |
dc52dd3a DM |
360 | /* Dirtify all the dquots - this can block when journalling */ |
361 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
362 | { | |
363 | int ret, err, cnt; | |
364 | ||
365 | ret = err = 0; | |
366 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
367 | if (dquot[cnt]) | |
368 | /* Even in case of error we have to continue */ | |
369 | ret = mark_dquot_dirty(dquot[cnt]); | |
370 | if (!err) | |
371 | err = ret; | |
372 | } | |
373 | return err; | |
374 | } | |
375 | ||
376 | static inline void dqput_all(struct dquot **dquot) | |
377 | { | |
378 | unsigned int cnt; | |
379 | ||
380 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
381 | dqput(dquot[cnt]); | |
382 | } | |
383 | ||
1da177e4 LT |
384 | /* This function needs dq_list_lock */ |
385 | static inline int clear_dquot_dirty(struct dquot *dquot) | |
386 | { | |
387 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) | |
388 | return 0; | |
389 | list_del_init(&dquot->dq_dirty); | |
390 | return 1; | |
391 | } | |
392 | ||
393 | void mark_info_dirty(struct super_block *sb, int type) | |
394 | { | |
395 | set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); | |
396 | } | |
397 | EXPORT_SYMBOL(mark_info_dirty); | |
398 | ||
399 | /* | |
400 | * Read dquot from disk and alloc space for it | |
401 | */ | |
402 | ||
403 | int dquot_acquire(struct dquot *dquot) | |
404 | { | |
405 | int ret = 0, ret2 = 0; | |
406 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
407 | ||
d3be915f IM |
408 | mutex_lock(&dquot->dq_lock); |
409 | mutex_lock(&dqopt->dqio_mutex); | |
1da177e4 | 410 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
4c376dca | 411 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
1da177e4 LT |
412 | if (ret < 0) |
413 | goto out_iolock; | |
414 | set_bit(DQ_READ_B, &dquot->dq_flags); | |
415 | /* Instantiate dquot if needed */ | |
416 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 417 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 418 | /* Write the info if needed */ |
4c376dca EB |
419 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
420 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
421 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 422 | } |
1da177e4 LT |
423 | if (ret < 0) |
424 | goto out_iolock; | |
425 | if (ret2 < 0) { | |
426 | ret = ret2; | |
427 | goto out_iolock; | |
428 | } | |
429 | } | |
430 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
431 | out_iolock: | |
d3be915f IM |
432 | mutex_unlock(&dqopt->dqio_mutex); |
433 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
434 | return ret; |
435 | } | |
08d0350c | 436 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
437 | |
438 | /* | |
439 | * Write dquot to disk | |
440 | */ | |
441 | int dquot_commit(struct dquot *dquot) | |
442 | { | |
b03f2456 | 443 | int ret = 0; |
1da177e4 LT |
444 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
445 | ||
d3be915f | 446 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
447 | spin_lock(&dq_list_lock); |
448 | if (!clear_dquot_dirty(dquot)) { | |
449 | spin_unlock(&dq_list_lock); | |
450 | goto out_sem; | |
451 | } | |
452 | spin_unlock(&dq_list_lock); | |
453 | /* Inactive dquot can be only if there was error during read/init | |
454 | * => we have better not writing it */ | |
b03f2456 | 455 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 456 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
457 | else |
458 | ret = -EIO; | |
1da177e4 | 459 | out_sem: |
d3be915f | 460 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
461 | return ret; |
462 | } | |
08d0350c | 463 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
464 | |
465 | /* | |
466 | * Release dquot | |
467 | */ | |
468 | int dquot_release(struct dquot *dquot) | |
469 | { | |
470 | int ret = 0, ret2 = 0; | |
471 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
472 | ||
d3be915f | 473 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
474 | /* Check whether we are not racing with some other dqget() */ |
475 | if (atomic_read(&dquot->dq_count) > 1) | |
476 | goto out_dqlock; | |
d3be915f | 477 | mutex_lock(&dqopt->dqio_mutex); |
4c376dca EB |
478 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
479 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 480 | /* Write the info */ |
4c376dca EB |
481 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
482 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
483 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 484 | } |
1da177e4 LT |
485 | if (ret >= 0) |
486 | ret = ret2; | |
487 | } | |
488 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 489 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 490 | out_dqlock: |
d3be915f | 491 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
492 | return ret; |
493 | } | |
08d0350c | 494 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 495 | |
7d9056ba | 496 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
497 | { |
498 | kmem_cache_free(dquot_cachep, dquot); | |
499 | } | |
7d9056ba | 500 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
501 | |
502 | static inline void do_destroy_dquot(struct dquot *dquot) | |
503 | { | |
504 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
505 | } | |
506 | ||
1da177e4 LT |
507 | /* Invalidate all dquots on the list. Note that this function is called after |
508 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
509 | * quota users. There can still be some users of quotas due to inodes being |
510 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 511 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 512 | */ |
1da177e4 LT |
513 | static void invalidate_dquots(struct super_block *sb, int type) |
514 | { | |
c33ed271 | 515 | struct dquot *dquot, *tmp; |
1da177e4 | 516 | |
6362e4d4 | 517 | restart: |
1da177e4 | 518 | spin_lock(&dq_list_lock); |
c33ed271 | 519 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
520 | if (dquot->dq_sb != sb) |
521 | continue; | |
4c376dca | 522 | if (dquot->dq_id.type != type) |
1da177e4 | 523 | continue; |
6362e4d4 JK |
524 | /* Wait for dquot users */ |
525 | if (atomic_read(&dquot->dq_count)) { | |
526 | DEFINE_WAIT(wait); | |
527 | ||
9f985cb6 | 528 | dqgrab(dquot); |
6362e4d4 JK |
529 | prepare_to_wait(&dquot->dq_wait_unused, &wait, |
530 | TASK_UNINTERRUPTIBLE); | |
531 | spin_unlock(&dq_list_lock); | |
532 | /* Once dqput() wakes us up, we know it's time to free | |
533 | * the dquot. | |
534 | * IMPORTANT: we rely on the fact that there is always | |
535 | * at most one process waiting for dquot to free. | |
536 | * Otherwise dq_count would be > 1 and we would never | |
537 | * wake up. | |
538 | */ | |
539 | if (atomic_read(&dquot->dq_count) > 1) | |
540 | schedule(); | |
541 | finish_wait(&dquot->dq_wait_unused, &wait); | |
542 | dqput(dquot); | |
543 | /* At this moment dquot() need not exist (it could be | |
544 | * reclaimed by prune_dqcache(). Hence we must | |
545 | * restart. */ | |
546 | goto restart; | |
547 | } | |
548 | /* | |
549 | * Quota now has no users and it has been written on last | |
550 | * dqput() | |
551 | */ | |
1da177e4 LT |
552 | remove_dquot_hash(dquot); |
553 | remove_free_dquot(dquot); | |
554 | remove_inuse(dquot); | |
74f783af | 555 | do_destroy_dquot(dquot); |
1da177e4 LT |
556 | } |
557 | spin_unlock(&dq_list_lock); | |
558 | } | |
559 | ||
12c77527 JK |
560 | /* Call callback for every active dquot on given filesystem */ |
561 | int dquot_scan_active(struct super_block *sb, | |
562 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
563 | unsigned long priv) | |
564 | { | |
565 | struct dquot *dquot, *old_dquot = NULL; | |
566 | int ret = 0; | |
567 | ||
568 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
569 | spin_lock(&dq_list_lock); | |
570 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
571 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
572 | continue; | |
573 | if (dquot->dq_sb != sb) | |
574 | continue; | |
575 | /* Now we have active dquot so we can just increase use count */ | |
576 | atomic_inc(&dquot->dq_count); | |
12c77527 | 577 | spin_unlock(&dq_list_lock); |
dde95888 | 578 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
579 | dqput(old_dquot); |
580 | old_dquot = dquot; | |
1362f4ea JK |
581 | /* |
582 | * ->release_dquot() can be racing with us. Our reference | |
583 | * protects us from new calls to it so just wait for any | |
584 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
585 | */ | |
586 | wait_on_dquot(dquot); | |
587 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
588 | ret = fn(dquot, priv); | |
589 | if (ret < 0) | |
590 | goto out; | |
591 | } | |
12c77527 JK |
592 | spin_lock(&dq_list_lock); |
593 | /* We are safe to continue now because our dquot could not | |
594 | * be moved out of the inuse list while we hold the reference */ | |
595 | } | |
596 | spin_unlock(&dq_list_lock); | |
597 | out: | |
598 | dqput(old_dquot); | |
599 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
600 | return ret; | |
601 | } | |
08d0350c | 602 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 603 | |
ceed1723 JK |
604 | /* Write all dquot structures to quota files */ |
605 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
606 | { |
607 | struct list_head *dirty; | |
608 | struct dquot *dquot; | |
609 | struct quota_info *dqopt = sb_dqopt(sb); | |
610 | int cnt; | |
ceed1723 | 611 | int err, ret = 0; |
1da177e4 | 612 | |
d3be915f | 613 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
614 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
615 | if (type != -1 && cnt != type) | |
616 | continue; | |
f55abc0f | 617 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
618 | continue; |
619 | spin_lock(&dq_list_lock); | |
620 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
621 | while (!list_empty(dirty)) { | |
268157ba JK |
622 | dquot = list_first_entry(dirty, struct dquot, |
623 | dq_dirty); | |
1da177e4 LT |
624 | /* Dirty and inactive can be only bad dquot... */ |
625 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
626 | clear_dquot_dirty(dquot); | |
627 | continue; | |
628 | } | |
629 | /* Now we have active dquot from which someone is | |
630 | * holding reference so we can safely just increase | |
631 | * use count */ | |
9f985cb6 | 632 | dqgrab(dquot); |
1da177e4 | 633 | spin_unlock(&dq_list_lock); |
dde95888 | 634 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 JK |
635 | err = sb->dq_op->write_dquot(dquot); |
636 | if (!ret && err) | |
474d2605 | 637 | ret = err; |
1da177e4 LT |
638 | dqput(dquot); |
639 | spin_lock(&dq_list_lock); | |
640 | } | |
641 | spin_unlock(&dq_list_lock); | |
642 | } | |
643 | ||
644 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
645 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
646 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 647 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 648 | dqstats_inc(DQST_SYNCS); |
d3be915f | 649 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 650 | |
ceed1723 JK |
651 | return ret; |
652 | } | |
653 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
654 | ||
655 | /* Write all dquot structures to disk and make them visible from userspace */ | |
656 | int dquot_quota_sync(struct super_block *sb, int type) | |
657 | { | |
658 | struct quota_info *dqopt = sb_dqopt(sb); | |
659 | int cnt; | |
660 | int ret; | |
661 | ||
662 | ret = dquot_writeback_dquots(sb, type); | |
663 | if (ret) | |
664 | return ret; | |
665 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
666 | return 0; |
667 | ||
668 | /* This is not very clever (and fast) but currently I don't know about | |
669 | * any other simple way of getting quota data to disk and we must get | |
670 | * them there for userspace to be visible... */ | |
671 | if (sb->s_op->sync_fs) | |
672 | sb->s_op->sync_fs(sb, 1); | |
673 | sync_blockdev(sb->s_bdev); | |
674 | ||
675 | /* | |
676 | * Now when everything is written we can discard the pagecache so | |
677 | * that userspace sees the changes. | |
678 | */ | |
f9ef1784 | 679 | mutex_lock(&dqopt->dqonoff_mutex); |
5fb324ad CH |
680 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
681 | if (type != -1 && cnt != type) | |
682 | continue; | |
683 | if (!sb_has_quota_active(sb, cnt)) | |
684 | continue; | |
a80b12c3 | 685 | mutex_lock(&dqopt->files[cnt]->i_mutex); |
f9ef1784 JK |
686 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
687 | mutex_unlock(&dqopt->files[cnt]->i_mutex); | |
5fb324ad | 688 | } |
f9ef1784 | 689 | mutex_unlock(&dqopt->dqonoff_mutex); |
5fb324ad | 690 | |
1da177e4 LT |
691 | return 0; |
692 | } | |
287a8095 | 693 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 694 | |
1ab6c499 DC |
695 | static unsigned long |
696 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 LT |
697 | { |
698 | struct list_head *head; | |
699 | struct dquot *dquot; | |
1ab6c499 | 700 | unsigned long freed = 0; |
1da177e4 | 701 | |
d68aab6b | 702 | spin_lock(&dq_list_lock); |
1da177e4 | 703 | head = free_dquots.prev; |
1ab6c499 | 704 | while (head != &free_dquots && sc->nr_to_scan) { |
1da177e4 LT |
705 | dquot = list_entry(head, struct dquot, dq_free); |
706 | remove_dquot_hash(dquot); | |
707 | remove_free_dquot(dquot); | |
708 | remove_inuse(dquot); | |
74f783af | 709 | do_destroy_dquot(dquot); |
1ab6c499 DC |
710 | sc->nr_to_scan--; |
711 | freed++; | |
1da177e4 LT |
712 | head = free_dquots.prev; |
713 | } | |
d68aab6b | 714 | spin_unlock(&dq_list_lock); |
1ab6c499 | 715 | return freed; |
1da177e4 LT |
716 | } |
717 | ||
1ab6c499 DC |
718 | static unsigned long |
719 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 720 | { |
55f841ce GC |
721 | return vfs_pressure_ratio( |
722 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
723 | } |
724 | ||
8e1f936b | 725 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
726 | .count_objects = dqcache_shrink_count, |
727 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
728 | .seeks = DEFAULT_SEEKS, |
729 | }; | |
730 | ||
1da177e4 LT |
731 | /* |
732 | * Put reference to dquot | |
1da177e4 | 733 | */ |
3d9ea253 | 734 | void dqput(struct dquot *dquot) |
1da177e4 | 735 | { |
b48d3805 JK |
736 | int ret; |
737 | ||
1da177e4 LT |
738 | if (!dquot) |
739 | return; | |
62af9b52 | 740 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 741 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 742 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
743 | quotatypes[dquot->dq_id.type], |
744 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
745 | BUG(); |
746 | } | |
747 | #endif | |
dde95888 | 748 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
749 | we_slept: |
750 | spin_lock(&dq_list_lock); | |
751 | if (atomic_read(&dquot->dq_count) > 1) { | |
752 | /* We have more than one user... nothing to do */ | |
753 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 754 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 755 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 JK |
756 | atomic_read(&dquot->dq_count) == 1) |
757 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
758 | spin_unlock(&dq_list_lock); |
759 | return; | |
760 | } | |
761 | /* Need to release dquot? */ | |
762 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
763 | spin_unlock(&dq_list_lock); | |
764 | /* Commit dquot before releasing */ | |
b48d3805 JK |
765 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
766 | if (ret < 0) { | |
fb5ffb0e JZ |
767 | quota_error(dquot->dq_sb, "Can't write quota structure" |
768 | " (error %d). Quota may get out of sync!", | |
769 | ret); | |
b48d3805 JK |
770 | /* |
771 | * We clear dirty bit anyway, so that we avoid | |
772 | * infinite loop here | |
773 | */ | |
774 | spin_lock(&dq_list_lock); | |
775 | clear_dquot_dirty(dquot); | |
776 | spin_unlock(&dq_list_lock); | |
777 | } | |
1da177e4 LT |
778 | goto we_slept; |
779 | } | |
780 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
781 | clear_dquot_dirty(dquot); | |
782 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
783 | spin_unlock(&dq_list_lock); | |
784 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
785 | goto we_slept; | |
786 | } | |
787 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 788 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 789 | /* sanity check */ |
8abf6a47 | 790 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
791 | #endif |
792 | put_dquot_last(dquot); | |
793 | spin_unlock(&dq_list_lock); | |
794 | } | |
08d0350c | 795 | EXPORT_SYMBOL(dqput); |
1da177e4 | 796 | |
7d9056ba | 797 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
798 | { |
799 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
800 | } | |
7d9056ba | 801 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 802 | |
1da177e4 LT |
803 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
804 | { | |
805 | struct dquot *dquot; | |
806 | ||
74f783af | 807 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 808 | if(!dquot) |
dd6f3c6d | 809 | return NULL; |
1da177e4 | 810 | |
d3be915f | 811 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
812 | INIT_LIST_HEAD(&dquot->dq_free); |
813 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
814 | INIT_HLIST_NODE(&dquot->dq_hash); | |
815 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 816 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 | 817 | dquot->dq_sb = sb; |
1a06d420 | 818 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 LT |
819 | atomic_set(&dquot->dq_count, 1); |
820 | ||
821 | return dquot; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Get reference to dquot | |
cc33412f JK |
826 | * |
827 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
828 | * destroying our dquot by: | |
829 | * a) checking for quota flags under dq_list_lock and | |
830 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 831 | */ |
aca645a6 | 832 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 833 | { |
1a06d420 | 834 | unsigned int hashent = hashfn(sb, qid); |
dd6f3c6d | 835 | struct dquot *dquot = NULL, *empty = NULL; |
1da177e4 | 836 | |
1a06d420 | 837 | if (!sb_has_quota_active(sb, qid.type)) |
dd6f3c6d | 838 | return NULL; |
1da177e4 LT |
839 | we_slept: |
840 | spin_lock(&dq_list_lock); | |
cc33412f | 841 | spin_lock(&dq_state_lock); |
1a06d420 | 842 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
843 | spin_unlock(&dq_state_lock); |
844 | spin_unlock(&dq_list_lock); | |
845 | goto out; | |
846 | } | |
847 | spin_unlock(&dq_state_lock); | |
848 | ||
1a06d420 | 849 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
850 | if (!dquot) { |
851 | if (!empty) { | |
1da177e4 | 852 | spin_unlock(&dq_list_lock); |
1a06d420 | 853 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 854 | if (!empty) |
1da177e4 LT |
855 | schedule(); /* Try to wait for a moment... */ |
856 | goto we_slept; | |
857 | } | |
858 | dquot = empty; | |
dd6f3c6d | 859 | empty = NULL; |
4c376dca | 860 | dquot->dq_id = qid; |
1da177e4 LT |
861 | /* all dquots go on the inuse_list */ |
862 | put_inuse(dquot); | |
863 | /* hash it first so it can be found */ | |
864 | insert_dquot_hash(dquot); | |
1da177e4 | 865 | spin_unlock(&dq_list_lock); |
dde95888 | 866 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
867 | } else { |
868 | if (!atomic_read(&dquot->dq_count)) | |
869 | remove_free_dquot(dquot); | |
870 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 871 | spin_unlock(&dq_list_lock); |
dde95888 DM |
872 | dqstats_inc(DQST_CACHE_HITS); |
873 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 874 | } |
268157ba JK |
875 | /* Wait for dq_lock - after this we know that either dquot_release() is |
876 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 877 | wait_on_dquot(dquot); |
268157ba JK |
878 | /* Read the dquot / allocate space in quota file */ |
879 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && | |
880 | sb->dq_op->acquire_dquot(dquot) < 0) { | |
1da177e4 | 881 | dqput(dquot); |
dd6f3c6d | 882 | dquot = NULL; |
cc33412f | 883 | goto out; |
1da177e4 | 884 | } |
62af9b52 | 885 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 886 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 887 | #endif |
cc33412f JK |
888 | out: |
889 | if (empty) | |
890 | do_destroy_dquot(empty); | |
1da177e4 LT |
891 | |
892 | return dquot; | |
893 | } | |
08d0350c | 894 | EXPORT_SYMBOL(dqget); |
1da177e4 | 895 | |
2d0fa467 JK |
896 | static inline struct dquot **i_dquot(struct inode *inode) |
897 | { | |
2d0fa467 JK |
898 | return inode->i_sb->s_op->get_dquots(inode); |
899 | } | |
900 | ||
1da177e4 LT |
901 | static int dqinit_needed(struct inode *inode, int type) |
902 | { | |
903 | int cnt; | |
904 | ||
905 | if (IS_NOQUOTA(inode)) | |
906 | return 0; | |
907 | if (type != -1) | |
2d0fa467 | 908 | return !i_dquot(inode)[type]; |
1da177e4 | 909 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
2d0fa467 | 910 | if (!i_dquot(inode)[cnt]) |
1da177e4 LT |
911 | return 1; |
912 | return 0; | |
913 | } | |
914 | ||
d3be915f | 915 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
916 | static void add_dquot_ref(struct super_block *sb, int type) |
917 | { | |
941d2380 | 918 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 919 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 920 | int reserved = 0; |
4c5e6c0e | 921 | #endif |
1da177e4 | 922 | |
55fa6091 | 923 | spin_lock(&inode_sb_list_lock); |
d003fb70 | 924 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
925 | spin_lock(&inode->i_lock); |
926 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
927 | !atomic_read(&inode->i_writecount) || | |
928 | !dqinit_needed(inode, type)) { | |
929 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 930 | continue; |
250df6ed | 931 | } |
d003fb70 | 932 | __iget(inode); |
250df6ed | 933 | spin_unlock(&inode->i_lock); |
55fa6091 | 934 | spin_unlock(&inode_sb_list_lock); |
d003fb70 | 935 | |
d7e97117 JK |
936 | #ifdef CONFIG_QUOTA_DEBUG |
937 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
938 | reserved = 1; | |
939 | #endif | |
941d2380 | 940 | iput(old_inode); |
871a2931 | 941 | __dquot_initialize(inode, type); |
55fa6091 DC |
942 | |
943 | /* | |
944 | * We hold a reference to 'inode' so it couldn't have been | |
945 | * removed from s_inodes list while we dropped the | |
946 | * inode_sb_list_lock We cannot iput the inode now as we can be | |
947 | * holding the last reference and we cannot iput it under | |
948 | * inode_sb_list_lock. So we keep the reference and iput it | |
949 | * later. | |
950 | */ | |
941d2380 | 951 | old_inode = inode; |
55fa6091 | 952 | spin_lock(&inode_sb_list_lock); |
1da177e4 | 953 | } |
55fa6091 | 954 | spin_unlock(&inode_sb_list_lock); |
941d2380 | 955 | iput(old_inode); |
0a5a9c72 | 956 | |
62af9b52 | 957 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 958 | if (reserved) { |
fb5ffb0e JZ |
959 | quota_error(sb, "Writes happened before quota was turned on " |
960 | "thus quota information is probably inconsistent. " | |
961 | "Please run quotacheck(8)"); | |
0a5a9c72 | 962 | } |
4c5e6c0e | 963 | #endif |
1da177e4 LT |
964 | } |
965 | ||
268157ba JK |
966 | /* |
967 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 968 | * if we have the last reference to dquot |
268157ba | 969 | */ |
9eb6463f NY |
970 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
971 | struct list_head *tofree_head) | |
1da177e4 | 972 | { |
2d0fa467 | 973 | struct dquot *dquot = i_dquot(inode)[type]; |
1da177e4 | 974 | |
2d0fa467 | 975 | i_dquot(inode)[type] = NULL; |
9eb6463f NY |
976 | if (!dquot) |
977 | return; | |
978 | ||
979 | if (list_empty(&dquot->dq_free)) { | |
980 | /* | |
981 | * The inode still has reference to dquot so it can't be in the | |
982 | * free list | |
983 | */ | |
984 | spin_lock(&dq_list_lock); | |
985 | list_add(&dquot->dq_free, tofree_head); | |
986 | spin_unlock(&dq_list_lock); | |
987 | } else { | |
988 | /* | |
989 | * Dquot is already in a list to put so we won't drop the last | |
990 | * reference here. | |
991 | */ | |
992 | dqput(dquot); | |
1da177e4 | 993 | } |
1da177e4 LT |
994 | } |
995 | ||
268157ba JK |
996 | /* |
997 | * Free list of dquots | |
998 | * Dquots are removed from inodes and no new references can be got so we are | |
999 | * the only ones holding reference | |
1000 | */ | |
1da177e4 LT |
1001 | static void put_dquot_list(struct list_head *tofree_head) |
1002 | { | |
1003 | struct list_head *act_head; | |
1004 | struct dquot *dquot; | |
1005 | ||
1006 | act_head = tofree_head->next; | |
1da177e4 LT |
1007 | while (act_head != tofree_head) { |
1008 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1009 | act_head = act_head->next; | |
268157ba JK |
1010 | /* Remove dquot from the list so we won't have problems... */ |
1011 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1012 | dqput(dquot); |
1013 | } | |
1014 | } | |
1015 | ||
fb58b731 CH |
1016 | static void remove_dquot_ref(struct super_block *sb, int type, |
1017 | struct list_head *tofree_head) | |
1018 | { | |
1019 | struct inode *inode; | |
7af9cce8 | 1020 | int reserved = 0; |
fb58b731 | 1021 | |
55fa6091 | 1022 | spin_lock(&inode_sb_list_lock); |
fb58b731 | 1023 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1024 | /* |
1025 | * We have to scan also I_NEW inodes because they can already | |
1026 | * have quota pointer initialized. Luckily, we need to touch | |
1027 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1028 | * (dq_data_lock). |
aabb8fdb | 1029 | */ |
b9ba6f94 | 1030 | spin_lock(&dq_data_lock); |
7af9cce8 DM |
1031 | if (!IS_NOQUOTA(inode)) { |
1032 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1033 | reserved = 1; | |
fb58b731 | 1034 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1035 | } |
b9ba6f94 | 1036 | spin_unlock(&dq_data_lock); |
fb58b731 | 1037 | } |
55fa6091 | 1038 | spin_unlock(&inode_sb_list_lock); |
7af9cce8 DM |
1039 | #ifdef CONFIG_QUOTA_DEBUG |
1040 | if (reserved) { | |
1041 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1042 | " was disabled thus quota information is probably " | |
1043 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1044 | } | |
1045 | #endif | |
fb58b731 CH |
1046 | } |
1047 | ||
1da177e4 LT |
1048 | /* Gather all references from inodes and drop them */ |
1049 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1050 | { | |
1051 | LIST_HEAD(tofree_head); | |
1052 | ||
fb58b731 | 1053 | if (sb->dq_op) { |
fb58b731 | 1054 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1055 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1056 | put_dquot_list(&tofree_head); |
1057 | } | |
1da177e4 LT |
1058 | } |
1059 | ||
12095460 | 1060 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1061 | { |
1062 | dquot->dq_dqb.dqb_curinodes += number; | |
1063 | } | |
1064 | ||
1065 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1066 | { | |
1067 | dquot->dq_dqb.dqb_curspace += number; | |
1068 | } | |
1069 | ||
f18df228 MC |
1070 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1071 | { | |
1072 | dquot->dq_dqb.dqb_rsvspace += number; | |
1073 | } | |
1074 | ||
740d9dcd MC |
1075 | /* |
1076 | * Claim reserved quota space | |
1077 | */ | |
0a5a9c72 | 1078 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1079 | { |
0a5a9c72 JK |
1080 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1081 | WARN_ON_ONCE(1); | |
1082 | number = dquot->dq_dqb.dqb_rsvspace; | |
1083 | } | |
740d9dcd MC |
1084 | dquot->dq_dqb.dqb_curspace += number; |
1085 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1086 | } | |
1087 | ||
1c8924eb JK |
1088 | static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) |
1089 | { | |
1090 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) | |
1091 | number = dquot->dq_dqb.dqb_curspace; | |
1092 | dquot->dq_dqb.dqb_rsvspace += number; | |
1093 | dquot->dq_dqb.dqb_curspace -= number; | |
1094 | } | |
1095 | ||
740d9dcd MC |
1096 | static inline |
1097 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1098 | { | |
0a5a9c72 JK |
1099 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1100 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1101 | else { | |
1102 | WARN_ON_ONCE(1); | |
1103 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1104 | } | |
740d9dcd MC |
1105 | } |
1106 | ||
7a2435d8 | 1107 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1108 | { |
db49d2df JK |
1109 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1110 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1111 | dquot->dq_dqb.dqb_curinodes -= number; |
1112 | else | |
1113 | dquot->dq_dqb.dqb_curinodes = 0; | |
1114 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1115 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1116 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1117 | } | |
1118 | ||
7a2435d8 | 1119 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1120 | { |
db49d2df JK |
1121 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1122 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1123 | dquot->dq_dqb.dqb_curspace -= number; |
1124 | else | |
1125 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1126 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1127 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1128 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1129 | } | |
1130 | ||
bf097aaf JK |
1131 | struct dquot_warn { |
1132 | struct super_block *w_sb; | |
7b9c7321 | 1133 | struct kqid w_dq_id; |
bf097aaf JK |
1134 | short w_type; |
1135 | }; | |
1136 | ||
c525460e JK |
1137 | static int warning_issued(struct dquot *dquot, const int warntype) |
1138 | { | |
1139 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1140 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1141 | ((warntype == QUOTA_NL_IHARDWARN || | |
1142 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1143 | ||
1144 | if (!flag) | |
1145 | return 0; | |
1146 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1147 | } | |
1148 | ||
8e893469 | 1149 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1150 | static int flag_print_warnings = 1; |
1151 | ||
bf097aaf | 1152 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1153 | { |
1154 | if (!flag_print_warnings) | |
1155 | return 0; | |
1156 | ||
7b9c7321 | 1157 | switch (warn->w_dq_id.type) { |
1da177e4 | 1158 | case USRQUOTA: |
1a06d420 | 1159 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1160 | case GRPQUOTA: |
7b9c7321 | 1161 | return in_group_p(warn->w_dq_id.gid); |
6c29c50f JK |
1162 | case PRJQUOTA: /* Never taken... Just make gcc happy */ |
1163 | return 0; | |
1da177e4 LT |
1164 | } |
1165 | return 0; | |
1166 | } | |
1167 | ||
1da177e4 | 1168 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1169 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1170 | { |
1171 | char *msg = NULL; | |
24ec839c | 1172 | struct tty_struct *tty; |
bf097aaf | 1173 | int warntype = warn->w_type; |
1da177e4 | 1174 | |
657d3bfa JK |
1175 | if (warntype == QUOTA_NL_IHARDBELOW || |
1176 | warntype == QUOTA_NL_ISOFTBELOW || | |
1177 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1178 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1179 | return; |
1180 | ||
24ec839c PZ |
1181 | tty = get_current_tty(); |
1182 | if (!tty) | |
452a00d2 | 1183 | return; |
bf097aaf | 1184 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1185 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1186 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1187 | else |
24ec839c | 1188 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1189 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1190 | switch (warntype) { |
8e893469 | 1191 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1192 | msg = " file limit reached.\r\n"; |
1193 | break; | |
8e893469 | 1194 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1195 | msg = " file quota exceeded too long.\r\n"; |
1196 | break; | |
8e893469 | 1197 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1198 | msg = " file quota exceeded.\r\n"; |
1199 | break; | |
8e893469 | 1200 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1201 | msg = " block limit reached.\r\n"; |
1202 | break; | |
8e893469 | 1203 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1204 | msg = " block quota exceeded too long.\r\n"; |
1205 | break; | |
8e893469 | 1206 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1207 | msg = " block quota exceeded.\r\n"; |
1208 | break; | |
1209 | } | |
24ec839c | 1210 | tty_write_message(tty, msg); |
452a00d2 | 1211 | tty_kref_put(tty); |
1da177e4 | 1212 | } |
8e893469 JK |
1213 | #endif |
1214 | ||
bf097aaf JK |
1215 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1216 | int warntype) | |
1217 | { | |
1218 | if (warning_issued(dquot, warntype)) | |
1219 | return; | |
1220 | warn->w_type = warntype; | |
1221 | warn->w_sb = dquot->dq_sb; | |
1222 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1223 | } |
1224 | ||
f18df228 MC |
1225 | /* |
1226 | * Write warnings to the console and send warning messages over netlink. | |
1227 | * | |
bf097aaf | 1228 | * Note that this function can call into tty and networking code. |
f18df228 | 1229 | */ |
bf097aaf | 1230 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1231 | { |
1232 | int i; | |
1233 | ||
86e931a3 | 1234 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1235 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1236 | continue; | |
8e893469 | 1237 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1238 | print_warning(&warn[i]); |
8e893469 | 1239 | #endif |
7b9c7321 | 1240 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1241 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1242 | } |
1da177e4 LT |
1243 | } |
1244 | ||
7a2435d8 | 1245 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1246 | { |
4c376dca | 1247 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1248 | |
1249 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1250 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1251 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1252 | } |
1253 | ||
1254 | /* needs dq_data_lock */ | |
bf097aaf JK |
1255 | static int check_idq(struct dquot *dquot, qsize_t inodes, |
1256 | struct dquot_warn *warn) | |
1da177e4 | 1257 | { |
268157ba JK |
1258 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1259 | ||
4c376dca | 1260 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1261 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1262 | return 0; |
1da177e4 LT |
1263 | |
1264 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1265 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1266 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1267 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
efd8f0e6 | 1268 | return -EDQUOT; |
1da177e4 LT |
1269 | } |
1270 | ||
1271 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1272 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1273 | dquot->dq_dqb.dqb_itime && | |
1274 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1275 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1276 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
efd8f0e6 | 1277 | return -EDQUOT; |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1281 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1282 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1283 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
268157ba | 1284 | dquot->dq_dqb.dqb_itime = get_seconds() + |
4c376dca | 1285 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 LT |
1286 | } |
1287 | ||
efd8f0e6 | 1288 | return 0; |
1da177e4 LT |
1289 | } |
1290 | ||
1291 | /* needs dq_data_lock */ | |
bf097aaf JK |
1292 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, |
1293 | struct dquot_warn *warn) | |
1da177e4 | 1294 | { |
f18df228 | 1295 | qsize_t tspace; |
268157ba | 1296 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1297 | |
4c376dca | 1298 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1299 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1300 | return 0; |
1da177e4 | 1301 | |
f18df228 MC |
1302 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1303 | + space; | |
1304 | ||
1da177e4 | 1305 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1306 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1307 | !ignore_hardlimit(dquot)) { |
1308 | if (!prealloc) | |
bf097aaf | 1309 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
efd8f0e6 | 1310 | return -EDQUOT; |
1da177e4 LT |
1311 | } |
1312 | ||
1313 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1314 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1315 | dquot->dq_dqb.dqb_btime && |
1316 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1317 | !ignore_hardlimit(dquot)) { |
1318 | if (!prealloc) | |
bf097aaf | 1319 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
efd8f0e6 | 1320 | return -EDQUOT; |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1324 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1325 | dquot->dq_dqb.dqb_btime == 0) { |
1326 | if (!prealloc) { | |
bf097aaf | 1327 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
268157ba | 1328 | dquot->dq_dqb.dqb_btime = get_seconds() + |
4c376dca | 1329 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
1da177e4 LT |
1330 | } |
1331 | else | |
1332 | /* | |
1333 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1334 | * be always printed | |
1335 | */ | |
efd8f0e6 | 1336 | return -EDQUOT; |
1da177e4 LT |
1337 | } |
1338 | ||
efd8f0e6 | 1339 | return 0; |
1da177e4 LT |
1340 | } |
1341 | ||
12095460 | 1342 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1343 | { |
268157ba JK |
1344 | qsize_t newinodes; |
1345 | ||
657d3bfa | 1346 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1347 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1348 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1349 | return QUOTA_NL_NOWARN; |
1350 | ||
268157ba JK |
1351 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1352 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1353 | return QUOTA_NL_ISOFTBELOW; |
1354 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1355 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1356 | return QUOTA_NL_IHARDBELOW; |
1357 | return QUOTA_NL_NOWARN; | |
1358 | } | |
1359 | ||
1360 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1361 | { | |
1362 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1363 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1364 | return QUOTA_NL_NOWARN; |
1365 | ||
12095460 | 1366 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1367 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1368 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1369 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1370 | return QUOTA_NL_BHARDBELOW; |
1371 | return QUOTA_NL_NOWARN; | |
1372 | } | |
0a5a9c72 | 1373 | |
189eef59 CH |
1374 | static int dquot_active(const struct inode *inode) |
1375 | { | |
1376 | struct super_block *sb = inode->i_sb; | |
1377 | ||
1378 | if (IS_NOQUOTA(inode)) | |
1379 | return 0; | |
1380 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1381 | } | |
1382 | ||
1da177e4 | 1383 | /* |
871a2931 CH |
1384 | * Initialize quota pointers in inode |
1385 | * | |
871a2931 CH |
1386 | * It is better to call this function outside of any transaction as it |
1387 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1388 | */ |
871a2931 | 1389 | static void __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1390 | { |
1ea06bec | 1391 | int cnt, init_needed = 0; |
ad1e6e8d | 1392 | struct dquot *got[MAXQUOTAS]; |
cc33412f | 1393 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1394 | qsize_t rsv; |
1da177e4 | 1395 | |
189eef59 | 1396 | if (!dquot_active(inode)) |
871a2931 | 1397 | return; |
cc33412f JK |
1398 | |
1399 | /* First get references to structures we might need. */ | |
1400 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1401 | struct kqid qid; |
ad1e6e8d | 1402 | got[cnt] = NULL; |
cc33412f JK |
1403 | if (type != -1 && cnt != type) |
1404 | continue; | |
1ea06bec NY |
1405 | /* |
1406 | * The i_dquot should have been initialized in most cases, | |
1407 | * we check it without locking here to avoid unnecessary | |
1408 | * dqget()/dqput() calls. | |
1409 | */ | |
2d0fa467 | 1410 | if (i_dquot(inode)[cnt]) |
1ea06bec NY |
1411 | continue; |
1412 | init_needed = 1; | |
1413 | ||
cc33412f JK |
1414 | switch (cnt) { |
1415 | case USRQUOTA: | |
aca645a6 | 1416 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1417 | break; |
1418 | case GRPQUOTA: | |
aca645a6 | 1419 | qid = make_kqid_gid(inode->i_gid); |
cc33412f JK |
1420 | break; |
1421 | } | |
aca645a6 | 1422 | got[cnt] = dqget(sb, qid); |
cc33412f JK |
1423 | } |
1424 | ||
1ea06bec NY |
1425 | /* All required i_dquot has been initialized */ |
1426 | if (!init_needed) | |
1427 | return; | |
1428 | ||
b9ba6f94 | 1429 | spin_lock(&dq_data_lock); |
1da177e4 LT |
1430 | if (IS_NOQUOTA(inode)) |
1431 | goto out_err; | |
1432 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
1433 | if (type != -1 && cnt != type) | |
1434 | continue; | |
cc33412f JK |
1435 | /* Avoid races with quotaoff() */ |
1436 | if (!sb_has_quota_active(sb, cnt)) | |
1437 | continue; | |
4408ea41 JK |
1438 | /* We could race with quotaon or dqget() could have failed */ |
1439 | if (!got[cnt]) | |
1440 | continue; | |
2d0fa467 JK |
1441 | if (!i_dquot(inode)[cnt]) { |
1442 | i_dquot(inode)[cnt] = got[cnt]; | |
dd6f3c6d | 1443 | got[cnt] = NULL; |
0a5a9c72 JK |
1444 | /* |
1445 | * Make quota reservation system happy if someone | |
1446 | * did a write before quota was turned on | |
1447 | */ | |
1448 | rsv = inode_get_rsv_space(inode); | |
b9ba6f94 | 1449 | if (unlikely(rsv)) |
2d0fa467 | 1450 | dquot_resv_space(i_dquot(inode)[cnt], rsv); |
1da177e4 LT |
1451 | } |
1452 | } | |
1453 | out_err: | |
b9ba6f94 | 1454 | spin_unlock(&dq_data_lock); |
cc33412f | 1455 | /* Drop unused references */ |
dc52dd3a | 1456 | dqput_all(got); |
871a2931 CH |
1457 | } |
1458 | ||
1459 | void dquot_initialize(struct inode *inode) | |
1460 | { | |
1461 | __dquot_initialize(inode, -1); | |
1da177e4 | 1462 | } |
08d0350c | 1463 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1464 | |
1465 | /* | |
b9ba6f94 NY |
1466 | * Release all quotas referenced by inode. |
1467 | * | |
1468 | * This function only be called on inode free or converting | |
1469 | * a file to quota file, no other users for the i_dquot in | |
1470 | * both cases, so we needn't call synchronize_srcu() after | |
1471 | * clearing i_dquot. | |
1da177e4 | 1472 | */ |
9f754758 | 1473 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1474 | { |
1475 | int cnt; | |
cc33412f | 1476 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1477 | |
b9ba6f94 | 1478 | spin_lock(&dq_data_lock); |
1da177e4 | 1479 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2d0fa467 JK |
1480 | put[cnt] = i_dquot(inode)[cnt]; |
1481 | i_dquot(inode)[cnt] = NULL; | |
1da177e4 | 1482 | } |
b9ba6f94 | 1483 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1484 | dqput_all(put); |
1da177e4 LT |
1485 | } |
1486 | ||
9f754758 CH |
1487 | void dquot_drop(struct inode *inode) |
1488 | { | |
1489 | int cnt; | |
1490 | ||
1491 | if (IS_NOQUOTA(inode)) | |
1492 | return; | |
1493 | ||
1494 | /* | |
1495 | * Test before calling to rule out calls from proc and such | |
1496 | * where we are not allowed to block. Note that this is | |
1497 | * actually reliable test even without the lock - the caller | |
1498 | * must assure that nobody can come after the DQUOT_DROP and | |
1499 | * add quota pointers back anyway. | |
1500 | */ | |
1501 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2d0fa467 | 1502 | if (i_dquot(inode)[cnt]) |
9f754758 CH |
1503 | break; |
1504 | } | |
1505 | ||
1506 | if (cnt < MAXQUOTAS) | |
1507 | __dquot_drop(inode); | |
1508 | } | |
1509 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1510 | |
fd8fbfc1 DM |
1511 | /* |
1512 | * inode_reserved_space is managed internally by quota, and protected by | |
1513 | * i_lock similar to i_blocks+i_bytes. | |
1514 | */ | |
1515 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1516 | { | |
1517 | /* Filesystem must explicitly define it's own method in order to use | |
1518 | * quota reservation interface */ | |
1519 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1520 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1521 | } | |
1522 | ||
c469070a | 1523 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1524 | { |
1525 | spin_lock(&inode->i_lock); | |
1526 | *inode_reserved_space(inode) += number; | |
1527 | spin_unlock(&inode->i_lock); | |
1528 | } | |
c469070a | 1529 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1530 | |
c469070a | 1531 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1532 | { |
1533 | spin_lock(&inode->i_lock); | |
1534 | *inode_reserved_space(inode) -= number; | |
1535 | __inode_add_bytes(inode, number); | |
1536 | spin_unlock(&inode->i_lock); | |
1537 | } | |
c469070a | 1538 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1539 | |
1c8924eb JK |
1540 | void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) |
1541 | { | |
1542 | spin_lock(&inode->i_lock); | |
1543 | *inode_reserved_space(inode) += number; | |
1544 | __inode_sub_bytes(inode, number); | |
1545 | spin_unlock(&inode->i_lock); | |
1546 | } | |
1547 | EXPORT_SYMBOL(inode_reclaim_rsv_space); | |
1548 | ||
c469070a | 1549 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1550 | { |
1551 | spin_lock(&inode->i_lock); | |
1552 | *inode_reserved_space(inode) -= number; | |
1553 | spin_unlock(&inode->i_lock); | |
1554 | } | |
c469070a | 1555 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1556 | |
1557 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1558 | { | |
1559 | qsize_t ret; | |
05b5d898 JK |
1560 | |
1561 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1562 | return 0; | |
fd8fbfc1 DM |
1563 | spin_lock(&inode->i_lock); |
1564 | ret = *inode_reserved_space(inode); | |
1565 | spin_unlock(&inode->i_lock); | |
1566 | return ret; | |
1567 | } | |
1568 | ||
1569 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1570 | int reserve) | |
1571 | { | |
1572 | if (reserve) | |
1573 | inode_add_rsv_space(inode, number); | |
1574 | else | |
1575 | inode_add_bytes(inode, number); | |
1576 | } | |
1577 | ||
1578 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1579 | { | |
1580 | if (reserve) | |
1581 | inode_sub_rsv_space(inode, number); | |
1582 | else | |
1583 | inode_sub_bytes(inode, number); | |
1584 | } | |
1585 | ||
1da177e4 | 1586 | /* |
5dd4056d CH |
1587 | * This functions updates i_blocks+i_bytes fields and quota information |
1588 | * (together with appropriate checks). | |
1589 | * | |
1590 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1591 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1592 | * the current transaction so that dquot write and inode write go into the | |
1593 | * same transaction. | |
1da177e4 LT |
1594 | */ |
1595 | ||
1596 | /* | |
1597 | * This operation can block, but only after everything is updated | |
1598 | */ | |
56246f9a | 1599 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1600 | { |
b9ba6f94 | 1601 | int cnt, ret = 0, index; |
bf097aaf | 1602 | struct dquot_warn warn[MAXQUOTAS]; |
2d0fa467 | 1603 | struct dquot **dquots = i_dquot(inode); |
56246f9a | 1604 | int reserve = flags & DQUOT_SPACE_RESERVE; |
1da177e4 | 1605 | |
189eef59 | 1606 | if (!dquot_active(inode)) { |
fd8fbfc1 DM |
1607 | inode_incr_space(inode, number, reserve); |
1608 | goto out; | |
1609 | } | |
1610 | ||
1da177e4 | 1611 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1612 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1613 | |
b9ba6f94 | 1614 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1615 | spin_lock(&dq_data_lock); |
1616 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1617 | if (!dquots[cnt]) |
1da177e4 | 1618 | continue; |
bf097aaf JK |
1619 | ret = check_bdq(dquots[cnt], number, |
1620 | !(flags & DQUOT_SPACE_WARN), &warn[cnt]); | |
1621 | if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { | |
fd8fbfc1 DM |
1622 | spin_unlock(&dq_data_lock); |
1623 | goto out_flush_warn; | |
f18df228 | 1624 | } |
1da177e4 LT |
1625 | } |
1626 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1627 | if (!dquots[cnt]) |
1da177e4 | 1628 | continue; |
f18df228 | 1629 | if (reserve) |
bf097aaf | 1630 | dquot_resv_space(dquots[cnt], number); |
f18df228 | 1631 | else |
bf097aaf | 1632 | dquot_incr_space(dquots[cnt], number); |
1da177e4 | 1633 | } |
fd8fbfc1 | 1634 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1635 | spin_unlock(&dq_data_lock); |
f18df228 | 1636 | |
fd8fbfc1 DM |
1637 | if (reserve) |
1638 | goto out_flush_warn; | |
bf097aaf | 1639 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1640 | out_flush_warn: |
b9ba6f94 | 1641 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1642 | flush_warnings(warn); |
f18df228 MC |
1643 | out: |
1644 | return ret; | |
1645 | } | |
5dd4056d | 1646 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1647 | |
1648 | /* | |
1649 | * This operation can block, but only after everything is updated | |
1650 | */ | |
6bab3596 | 1651 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1652 | { |
b9ba6f94 | 1653 | int cnt, ret = 0, index; |
bf097aaf | 1654 | struct dquot_warn warn[MAXQUOTAS]; |
2d0fa467 | 1655 | struct dquot * const *dquots = i_dquot(inode); |
1da177e4 | 1656 | |
189eef59 | 1657 | if (!dquot_active(inode)) |
63936dda | 1658 | return 0; |
1da177e4 | 1659 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1660 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 NY |
1661 | |
1662 | index = srcu_read_lock(&dquot_srcu); | |
1da177e4 LT |
1663 | spin_lock(&dq_data_lock); |
1664 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1665 | if (!dquots[cnt]) |
1da177e4 | 1666 | continue; |
bf097aaf | 1667 | ret = check_idq(dquots[cnt], 1, &warn[cnt]); |
efd8f0e6 | 1668 | if (ret) |
1da177e4 LT |
1669 | goto warn_put_all; |
1670 | } | |
1671 | ||
1672 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1673 | if (!dquots[cnt]) |
1da177e4 | 1674 | continue; |
bf097aaf | 1675 | dquot_incr_inodes(dquots[cnt], 1); |
1da177e4 | 1676 | } |
efd8f0e6 | 1677 | |
1da177e4 LT |
1678 | warn_put_all: |
1679 | spin_unlock(&dq_data_lock); | |
63936dda | 1680 | if (ret == 0) |
bf097aaf | 1681 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1682 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1683 | flush_warnings(warn); |
1da177e4 LT |
1684 | return ret; |
1685 | } | |
08d0350c | 1686 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1687 | |
5dd4056d CH |
1688 | /* |
1689 | * Convert in-memory reserved quotas to real consumed quotas | |
1690 | */ | |
1691 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1692 | { |
b9ba6f94 | 1693 | int cnt, index; |
740d9dcd | 1694 | |
189eef59 | 1695 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1696 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1697 | return 0; |
740d9dcd MC |
1698 | } |
1699 | ||
b9ba6f94 | 1700 | index = srcu_read_lock(&dquot_srcu); |
740d9dcd MC |
1701 | spin_lock(&dq_data_lock); |
1702 | /* Claim reserved quotas to allocated quotas */ | |
1703 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2d0fa467 JK |
1704 | if (i_dquot(inode)[cnt]) |
1705 | dquot_claim_reserved_space(i_dquot(inode)[cnt], | |
740d9dcd MC |
1706 | number); |
1707 | } | |
1708 | /* Update inode bytes */ | |
fd8fbfc1 | 1709 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1710 | spin_unlock(&dq_data_lock); |
2d0fa467 | 1711 | mark_all_dquot_dirty(i_dquot(inode)); |
b9ba6f94 | 1712 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1713 | return 0; |
740d9dcd | 1714 | } |
5dd4056d | 1715 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1716 | |
1c8924eb JK |
1717 | /* |
1718 | * Convert allocated space back to in-memory reserved quotas | |
1719 | */ | |
1720 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1721 | { | |
b9ba6f94 | 1722 | int cnt, index; |
1c8924eb JK |
1723 | |
1724 | if (!dquot_active(inode)) { | |
1725 | inode_reclaim_rsv_space(inode, number); | |
1726 | return; | |
1727 | } | |
1728 | ||
b9ba6f94 | 1729 | index = srcu_read_lock(&dquot_srcu); |
1c8924eb JK |
1730 | spin_lock(&dq_data_lock); |
1731 | /* Claim reserved quotas to allocated quotas */ | |
1732 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
2d0fa467 JK |
1733 | if (i_dquot(inode)[cnt]) |
1734 | dquot_reclaim_reserved_space(i_dquot(inode)[cnt], | |
1c8924eb JK |
1735 | number); |
1736 | } | |
1737 | /* Update inode bytes */ | |
1738 | inode_reclaim_rsv_space(inode, number); | |
1739 | spin_unlock(&dq_data_lock); | |
2d0fa467 | 1740 | mark_all_dquot_dirty(i_dquot(inode)); |
b9ba6f94 | 1741 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1742 | return; |
1743 | } | |
1744 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1745 | ||
1da177e4 LT |
1746 | /* |
1747 | * This operation can block, but only after everything is updated | |
1748 | */ | |
56246f9a | 1749 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1750 | { |
1751 | unsigned int cnt; | |
bf097aaf | 1752 | struct dquot_warn warn[MAXQUOTAS]; |
2d0fa467 | 1753 | struct dquot **dquots = i_dquot(inode); |
b9ba6f94 | 1754 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1755 | |
189eef59 | 1756 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1757 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1758 | return; |
1da177e4 | 1759 | } |
657d3bfa | 1760 | |
b9ba6f94 | 1761 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1762 | spin_lock(&dq_data_lock); |
1763 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1764 | int wtype; |
1765 | ||
1766 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1767 | if (!dquots[cnt]) | |
1da177e4 | 1768 | continue; |
bf097aaf JK |
1769 | wtype = info_bdq_free(dquots[cnt], number); |
1770 | if (wtype != QUOTA_NL_NOWARN) | |
1771 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1772 | if (reserve) |
bf097aaf | 1773 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1774 | else |
bf097aaf | 1775 | dquot_decr_space(dquots[cnt], number); |
1da177e4 | 1776 | } |
fd8fbfc1 | 1777 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1778 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1779 | |
1780 | if (reserve) | |
1781 | goto out_unlock; | |
bf097aaf | 1782 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1783 | out_unlock: |
b9ba6f94 | 1784 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1785 | flush_warnings(warn); |
fd8fbfc1 | 1786 | } |
5dd4056d | 1787 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1788 | |
1da177e4 LT |
1789 | /* |
1790 | * This operation can block, but only after everything is updated | |
1791 | */ | |
6bab3596 | 1792 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1793 | { |
1794 | unsigned int cnt; | |
bf097aaf | 1795 | struct dquot_warn warn[MAXQUOTAS]; |
2d0fa467 | 1796 | struct dquot * const *dquots = i_dquot(inode); |
b9ba6f94 | 1797 | int index; |
1da177e4 | 1798 | |
189eef59 | 1799 | if (!dquot_active(inode)) |
63936dda | 1800 | return; |
657d3bfa | 1801 | |
b9ba6f94 | 1802 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1803 | spin_lock(&dq_data_lock); |
1804 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1805 | int wtype; |
1806 | ||
1807 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1808 | if (!dquots[cnt]) | |
1da177e4 | 1809 | continue; |
bf097aaf JK |
1810 | wtype = info_idq_free(dquots[cnt], 1); |
1811 | if (wtype != QUOTA_NL_NOWARN) | |
1812 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1813 | dquot_decr_inodes(dquots[cnt], 1); | |
1da177e4 LT |
1814 | } |
1815 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1816 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1817 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1818 | flush_warnings(warn); |
1da177e4 | 1819 | } |
08d0350c | 1820 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1821 | |
1822 | /* | |
1823 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1824 | * On success, dquot references in transfer_to are consumed and references |
1825 | * to original dquots that need to be released are placed there. On failure, | |
1826 | * references are kept untouched. | |
1da177e4 LT |
1827 | * |
1828 | * This operation can block, but only after everything is updated | |
1829 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1830 | * |
b9ba6f94 NY |
1831 | * We are holding reference on transfer_from & transfer_to, no need to |
1832 | * protect them by srcu_read_lock(). | |
1da177e4 | 1833 | */ |
bc8e5f07 | 1834 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1835 | { |
740d9dcd MC |
1836 | qsize_t space, cur_space; |
1837 | qsize_t rsv_space = 0; | |
bc8e5f07 | 1838 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1839 | int cnt, ret = 0; |
9e32784b | 1840 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1841 | struct dquot_warn warn_to[MAXQUOTAS]; |
1842 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1843 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1844 | |
1da177e4 | 1845 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1846 | return 0; |
cc33412f | 1847 | /* Initialize the arrays */ |
bf097aaf JK |
1848 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1849 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1850 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1851 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1852 | } | |
b9ba6f94 NY |
1853 | |
1854 | spin_lock(&dq_data_lock); | |
cc33412f | 1855 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
b9ba6f94 | 1856 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1857 | return 0; |
cc33412f | 1858 | } |
740d9dcd | 1859 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1860 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1861 | space = cur_space + rsv_space; |
1da177e4 LT |
1862 | /* Build the transfer_from list and check the limits */ |
1863 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b D |
1864 | /* |
1865 | * Skip changes for same uid or gid or for turned off quota-type. | |
1866 | */ | |
dd6f3c6d | 1867 | if (!transfer_to[cnt]) |
1da177e4 | 1868 | continue; |
9e32784b D |
1869 | /* Avoid races with quotaoff() */ |
1870 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1871 | continue; | |
1872 | is_valid[cnt] = 1; | |
2d0fa467 | 1873 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
bf097aaf | 1874 | ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); |
efd8f0e6 CH |
1875 | if (ret) |
1876 | goto over_quota; | |
bf097aaf | 1877 | ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); |
efd8f0e6 | 1878 | if (ret) |
cc33412f | 1879 | goto over_quota; |
1da177e4 LT |
1880 | } |
1881 | ||
1882 | /* | |
1883 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1884 | */ | |
1885 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b | 1886 | if (!is_valid[cnt]) |
1da177e4 | 1887 | continue; |
1da177e4 LT |
1888 | /* Due to IO error we might not have transfer_from[] structure */ |
1889 | if (transfer_from[cnt]) { | |
bf097aaf JK |
1890 | int wtype; |
1891 | wtype = info_idq_free(transfer_from[cnt], 1); | |
1892 | if (wtype != QUOTA_NL_NOWARN) | |
1893 | prepare_warning(&warn_from_inodes[cnt], | |
1894 | transfer_from[cnt], wtype); | |
1895 | wtype = info_bdq_free(transfer_from[cnt], space); | |
1896 | if (wtype != QUOTA_NL_NOWARN) | |
1897 | prepare_warning(&warn_from_space[cnt], | |
1898 | transfer_from[cnt], wtype); | |
1da177e4 | 1899 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1900 | dquot_decr_space(transfer_from[cnt], cur_space); |
1901 | dquot_free_reserved_space(transfer_from[cnt], | |
1902 | rsv_space); | |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1906 | dquot_incr_space(transfer_to[cnt], cur_space); |
1907 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 | 1908 | |
2d0fa467 | 1909 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 1910 | } |
1da177e4 | 1911 | spin_unlock(&dq_data_lock); |
cc33412f | 1912 | |
dc52dd3a DM |
1913 | mark_all_dquot_dirty(transfer_from); |
1914 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
1915 | flush_warnings(warn_to); |
1916 | flush_warnings(warn_from_inodes); | |
1917 | flush_warnings(warn_from_space); | |
bc8e5f07 | 1918 | /* Pass back references to put */ |
dc52dd3a | 1919 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
1920 | if (is_valid[cnt]) |
1921 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 1922 | return 0; |
cc33412f JK |
1923 | over_quota: |
1924 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1925 | flush_warnings(warn_to); |
86f3cbec | 1926 | return ret; |
1da177e4 | 1927 | } |
bc8e5f07 | 1928 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 1929 | |
8ddd69d6 DM |
1930 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1931 | * Called from FSXXX_setattr() | |
1932 | */ | |
b43fa828 | 1933 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1934 | { |
bc8e5f07 JK |
1935 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
1936 | struct super_block *sb = inode->i_sb; | |
1937 | int ret; | |
8ddd69d6 | 1938 | |
189eef59 | 1939 | if (!dquot_active(inode)) |
bc8e5f07 | 1940 | return 0; |
12755627 | 1941 | |
1a06d420 | 1942 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) |
aca645a6 | 1943 | transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid)); |
1a06d420 | 1944 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)) |
aca645a6 | 1945 | transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid)); |
bc8e5f07 JK |
1946 | |
1947 | ret = __dquot_transfer(inode, transfer_to); | |
1948 | dqput_all(transfer_to); | |
1949 | return ret; | |
b85f4b87 | 1950 | } |
b43fa828 | 1951 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 1952 | |
1da177e4 LT |
1953 | /* |
1954 | * Write info of quota file to disk | |
1955 | */ | |
1956 | int dquot_commit_info(struct super_block *sb, int type) | |
1957 | { | |
1958 | int ret; | |
1959 | struct quota_info *dqopt = sb_dqopt(sb); | |
1960 | ||
d3be915f | 1961 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 1962 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 1963 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
1964 | return ret; |
1965 | } | |
08d0350c | 1966 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 LT |
1967 | |
1968 | /* | |
1969 | * Definitions of diskquota operations. | |
1970 | */ | |
61e225dc | 1971 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
1972 | .write_dquot = dquot_commit, |
1973 | .acquire_dquot = dquot_acquire, | |
1974 | .release_dquot = dquot_release, | |
1975 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
1976 | .write_info = dquot_commit_info, |
1977 | .alloc_dquot = dquot_alloc, | |
1978 | .destroy_dquot = dquot_destroy, | |
1da177e4 | 1979 | }; |
123e9caf | 1980 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 1981 | |
907f4554 CH |
1982 | /* |
1983 | * Generic helper for ->open on filesystems supporting disk quotas. | |
1984 | */ | |
1985 | int dquot_file_open(struct inode *inode, struct file *file) | |
1986 | { | |
1987 | int error; | |
1988 | ||
1989 | error = generic_file_open(inode, file); | |
1990 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 1991 | dquot_initialize(inode); |
907f4554 CH |
1992 | return error; |
1993 | } | |
1994 | EXPORT_SYMBOL(dquot_file_open); | |
1995 | ||
1da177e4 LT |
1996 | /* |
1997 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
1998 | */ | |
0f0dd62f | 1999 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2000 | { |
0ff5af83 | 2001 | int cnt, ret = 0; |
1da177e4 LT |
2002 | struct quota_info *dqopt = sb_dqopt(sb); |
2003 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2004 | |
f55abc0f JK |
2005 | /* Cannot turn off usage accounting without turning off limits, or |
2006 | * suspend quotas and simultaneously turn quotas off. */ | |
2007 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2008 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2009 | DQUOT_USAGE_ENABLED))) | |
2010 | return -EINVAL; | |
2011 | ||
1da177e4 | 2012 | /* We need to serialize quota_off() for device */ |
d3be915f | 2013 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
2014 | |
2015 | /* | |
2016 | * Skip everything if there's nothing to do. We have to do this because | |
2017 | * sometimes we are called when fill_super() failed and calling | |
2018 | * sync_fs() in such cases does no good. | |
2019 | */ | |
f55abc0f | 2020 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
2021 | mutex_unlock(&dqopt->dqonoff_mutex); |
2022 | return 0; | |
2023 | } | |
1da177e4 LT |
2024 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2025 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2026 | if (type != -1 && cnt != type) |
2027 | continue; | |
f55abc0f | 2028 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2029 | continue; |
f55abc0f JK |
2030 | |
2031 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2032 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2033 | dqopt->flags |= |
2034 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2035 | spin_unlock(&dq_state_lock); |
f55abc0f | 2036 | } else { |
cc33412f | 2037 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2038 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2039 | /* Turning off suspended quotas? */ | |
2040 | if (!sb_has_quota_loaded(sb, cnt) && | |
2041 | sb_has_quota_suspended(sb, cnt)) { | |
2042 | dqopt->flags &= ~dquot_state_flag( | |
2043 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2044 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2045 | iput(dqopt->files[cnt]); |
2046 | dqopt->files[cnt] = NULL; | |
2047 | continue; | |
2048 | } | |
cc33412f | 2049 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2050 | } |
f55abc0f JK |
2051 | |
2052 | /* We still have to keep quota loaded? */ | |
2053 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2054 | continue; |
1da177e4 LT |
2055 | |
2056 | /* Note: these are blocking operations */ | |
2057 | drop_dquot_ref(sb, cnt); | |
2058 | invalidate_dquots(sb, cnt); | |
2059 | /* | |
268157ba JK |
2060 | * Now all dquots should be invalidated, all writes done so we |
2061 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2062 | */ |
2063 | if (info_dirty(&dqopt->info[cnt])) | |
2064 | sb->dq_op->write_info(sb, cnt); | |
2065 | if (dqopt->ops[cnt]->free_file_info) | |
2066 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2067 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2068 | ||
2069 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2070 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2071 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2072 | dqopt->info[cnt].dqi_flags = 0; |
2073 | dqopt->info[cnt].dqi_igrace = 0; | |
2074 | dqopt->info[cnt].dqi_bgrace = 0; | |
2075 | dqopt->ops[cnt] = NULL; | |
2076 | } | |
d3be915f | 2077 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2078 | |
2079 | /* Skip syncing and setting flags if quota files are hidden */ | |
2080 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2081 | goto put_inodes; | |
2082 | ||
1da177e4 | 2083 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2084 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2085 | if (sb->s_op->sync_fs) |
2086 | sb->s_op->sync_fs(sb, 1); | |
2087 | sync_blockdev(sb->s_bdev); | |
2088 | /* Now the quota files are just ordinary files and we can set the | |
2089 | * inode flags back. Moreover we discard the pagecache so that | |
2090 | * userspace sees the writes we did bypassing the pagecache. We | |
2091 | * must also discard the blockdev buffers so that we see the | |
2092 | * changes done by userspace on the next quotaon() */ | |
2093 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2094 | if (toputinode[cnt]) { | |
d3be915f | 2095 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2096 | /* If quota was reenabled in the meantime, we have |
2097 | * nothing to do */ | |
f55abc0f | 2098 | if (!sb_has_quota_loaded(sb, cnt)) { |
a80b12c3 | 2099 | mutex_lock(&toputinode[cnt]->i_mutex); |
1da177e4 LT |
2100 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
2101 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
2102 | truncate_inode_pages(&toputinode[cnt]->i_data, |
2103 | 0); | |
1b1dcc1b | 2104 | mutex_unlock(&toputinode[cnt]->i_mutex); |
43d2932d | 2105 | mark_inode_dirty_sync(toputinode[cnt]); |
1da177e4 | 2106 | } |
d3be915f | 2107 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2108 | } |
2109 | if (sb->s_bdev) | |
2110 | invalidate_bdev(sb->s_bdev); | |
2111 | put_inodes: | |
2112 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2113 | if (toputinode[cnt]) { | |
0ff5af83 | 2114 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2115 | * can reenable quota on the subsequent remount RW. We |
2116 | * have to check 'flags' variable and not use sb_has_ | |
2117 | * function because another quotaon / quotaoff could | |
2118 | * change global state before we got here. We refuse | |
2119 | * to suspend quotas when there is pending delete on | |
2120 | * the quota file... */ | |
2121 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2122 | iput(toputinode[cnt]); |
2123 | else if (!toputinode[cnt]->i_nlink) | |
2124 | ret = -EBUSY; | |
1da177e4 | 2125 | } |
0ff5af83 | 2126 | return ret; |
1da177e4 | 2127 | } |
0f0dd62f | 2128 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2129 | |
287a8095 | 2130 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2131 | { |
0f0dd62f CH |
2132 | return dquot_disable(sb, type, |
2133 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2134 | } |
287a8095 | 2135 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2136 | |
1da177e4 LT |
2137 | /* |
2138 | * Turn quotas on on a device | |
2139 | */ | |
2140 | ||
f55abc0f JK |
2141 | /* |
2142 | * Helper function to turn quotas on when we already have the inode of | |
2143 | * quota file and no quota information is loaded. | |
2144 | */ | |
2145 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2146 | unsigned int flags) | |
1da177e4 LT |
2147 | { |
2148 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2149 | struct super_block *sb = inode->i_sb; | |
2150 | struct quota_info *dqopt = sb_dqopt(sb); | |
2151 | int error; | |
2152 | int oldflags = -1; | |
2153 | ||
2154 | if (!fmt) | |
2155 | return -ESRCH; | |
2156 | if (!S_ISREG(inode->i_mode)) { | |
2157 | error = -EACCES; | |
2158 | goto out_fmt; | |
2159 | } | |
2160 | if (IS_RDONLY(inode)) { | |
2161 | error = -EROFS; | |
2162 | goto out_fmt; | |
2163 | } | |
2164 | if (!sb->s_op->quota_write || !sb->s_op->quota_read) { | |
2165 | error = -EINVAL; | |
2166 | goto out_fmt; | |
2167 | } | |
f55abc0f JK |
2168 | /* Usage always has to be set... */ |
2169 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2170 | error = -EINVAL; | |
2171 | goto out_fmt; | |
2172 | } | |
1da177e4 | 2173 | |
ca785ec6 | 2174 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2175 | /* As we bypass the pagecache we must now flush all the |
2176 | * dirty data and invalidate caches so that kernel sees | |
2177 | * changes from userspace. It is not enough to just flush | |
2178 | * the quota file since if blocksize < pagesize, invalidation | |
2179 | * of the cache could fail because of other unrelated dirty | |
2180 | * data */ | |
2181 | sync_filesystem(sb); | |
ca785ec6 JK |
2182 | invalidate_bdev(sb->s_bdev); |
2183 | } | |
d3be915f | 2184 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2185 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2186 | error = -EBUSY; |
2187 | goto out_lock; | |
2188 | } | |
ca785ec6 JK |
2189 | |
2190 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2191 | /* We don't want quota and atime on quota files (deadlocks | |
2192 | * possible) Also nobody should write to the file - we use | |
2193 | * special IO operations which ignore the immutable bit. */ | |
a80b12c3 | 2194 | mutex_lock(&inode->i_mutex); |
268157ba JK |
2195 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2196 | S_NOQUOTA); | |
ca785ec6 | 2197 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
dee86565 | 2198 | mutex_unlock(&inode->i_mutex); |
26245c94 JK |
2199 | /* |
2200 | * When S_NOQUOTA is set, remove dquot references as no more | |
2201 | * references can be added | |
2202 | */ | |
9f754758 | 2203 | __dquot_drop(inode); |
ca785ec6 | 2204 | } |
1da177e4 LT |
2205 | |
2206 | error = -EIO; | |
2207 | dqopt->files[type] = igrab(inode); | |
2208 | if (!dqopt->files[type]) | |
2209 | goto out_lock; | |
2210 | error = -EINVAL; | |
2211 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2212 | goto out_file_init; | |
2213 | ||
2214 | dqopt->ops[type] = fmt->qf_ops; | |
2215 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2216 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2217 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2218 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2219 | error = dqopt->ops[type]->read_file_info(sb, type); |
2220 | if (error < 0) { | |
d3be915f | 2221 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2222 | goto out_file_init; |
2223 | } | |
46fe44ce JK |
2224 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) |
2225 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; | |
d3be915f | 2226 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2227 | spin_lock(&dq_state_lock); |
f55abc0f | 2228 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2229 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2230 | |
2231 | add_dquot_ref(sb, type); | |
d3be915f | 2232 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2233 | |
2234 | return 0; | |
2235 | ||
2236 | out_file_init: | |
2237 | dqopt->files[type] = NULL; | |
2238 | iput(inode); | |
2239 | out_lock: | |
1da177e4 | 2240 | if (oldflags != -1) { |
a80b12c3 | 2241 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
2242 | /* Set the flags back (in the case of accidental quotaon() |
2243 | * on a wrong file we don't want to mess up the flags) */ | |
2244 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2245 | inode->i_flags |= oldflags; | |
dee86565 | 2246 | mutex_unlock(&inode->i_mutex); |
1da177e4 | 2247 | } |
d01730d7 | 2248 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2249 | out_fmt: |
2250 | put_quota_format(fmt); | |
2251 | ||
2252 | return error; | |
2253 | } | |
2254 | ||
0ff5af83 | 2255 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2256 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2257 | { |
2258 | struct quota_info *dqopt = sb_dqopt(sb); | |
2259 | struct inode *inode; | |
0f0dd62f | 2260 | int ret = 0, cnt; |
f55abc0f | 2261 | unsigned int flags; |
0ff5af83 | 2262 | |
0f0dd62f CH |
2263 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2264 | if (type != -1 && cnt != type) | |
2265 | continue; | |
2266 | ||
2267 | mutex_lock(&dqopt->dqonoff_mutex); | |
2268 | if (!sb_has_quota_suspended(sb, cnt)) { | |
2269 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2270 | continue; | |
2271 | } | |
2272 | inode = dqopt->files[cnt]; | |
2273 | dqopt->files[cnt] = NULL; | |
2274 | spin_lock(&dq_state_lock); | |
2275 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2276 | DQUOT_LIMITS_ENABLED, | |
2277 | cnt); | |
2278 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2279 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2280 | mutex_unlock(&dqopt->dqonoff_mutex); |
0ff5af83 | 2281 | |
0f0dd62f CH |
2282 | flags = dquot_generic_flag(flags, cnt); |
2283 | ret = vfs_load_quota_inode(inode, cnt, | |
2284 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2285 | iput(inode); | |
2286 | } | |
0ff5af83 JK |
2287 | |
2288 | return ret; | |
2289 | } | |
0f0dd62f | 2290 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2291 | |
f00c9e44 JK |
2292 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
2293 | struct path *path) | |
77e69dac AV |
2294 | { |
2295 | int error = security_quota_on(path->dentry); | |
2296 | if (error) | |
2297 | return error; | |
2298 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2299 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2300 | error = -EXDEV; |
2301 | else | |
f55abc0f JK |
2302 | error = vfs_load_quota_inode(path->dentry->d_inode, type, |
2303 | format_id, DQUOT_USAGE_ENABLED | | |
2304 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2305 | return error; |
2306 | } | |
287a8095 | 2307 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2308 | |
f55abc0f JK |
2309 | /* |
2310 | * More powerful function for turning on quotas allowing setting | |
2311 | * of individual quota flags | |
2312 | */ | |
287a8095 CH |
2313 | int dquot_enable(struct inode *inode, int type, int format_id, |
2314 | unsigned int flags) | |
f55abc0f JK |
2315 | { |
2316 | int ret = 0; | |
2317 | struct super_block *sb = inode->i_sb; | |
2318 | struct quota_info *dqopt = sb_dqopt(sb); | |
2319 | ||
2320 | /* Just unsuspend quotas? */ | |
0f0dd62f CH |
2321 | BUG_ON(flags & DQUOT_SUSPENDED); |
2322 | ||
f55abc0f JK |
2323 | if (!flags) |
2324 | return 0; | |
2325 | /* Just updating flags needed? */ | |
2326 | if (sb_has_quota_loaded(sb, type)) { | |
2327 | mutex_lock(&dqopt->dqonoff_mutex); | |
2328 | /* Now do a reliable test... */ | |
2329 | if (!sb_has_quota_loaded(sb, type)) { | |
2330 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2331 | goto load_quota; | |
2332 | } | |
2333 | if (flags & DQUOT_USAGE_ENABLED && | |
2334 | sb_has_quota_usage_enabled(sb, type)) { | |
2335 | ret = -EBUSY; | |
2336 | goto out_lock; | |
2337 | } | |
2338 | if (flags & DQUOT_LIMITS_ENABLED && | |
2339 | sb_has_quota_limits_enabled(sb, type)) { | |
2340 | ret = -EBUSY; | |
2341 | goto out_lock; | |
2342 | } | |
cc33412f | 2343 | spin_lock(&dq_state_lock); |
f55abc0f | 2344 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2345 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2346 | out_lock: |
2347 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2348 | return ret; | |
2349 | } | |
2350 | ||
2351 | load_quota: | |
2352 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2353 | } | |
287a8095 | 2354 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2355 | |
1da177e4 LT |
2356 | /* |
2357 | * This function is used when filesystem needs to initialize quotas | |
2358 | * during mount time. | |
2359 | */ | |
287a8095 | 2360 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2361 | int format_id, int type) |
1da177e4 | 2362 | { |
84de856e | 2363 | struct dentry *dentry; |
1da177e4 LT |
2364 | int error; |
2365 | ||
c56818d7 | 2366 | mutex_lock(&sb->s_root->d_inode->i_mutex); |
2fa389c5 | 2367 | dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); |
c56818d7 | 2368 | mutex_unlock(&sb->s_root->d_inode->i_mutex); |
84de856e CH |
2369 | if (IS_ERR(dentry)) |
2370 | return PTR_ERR(dentry); | |
2371 | ||
154f484b JK |
2372 | if (!dentry->d_inode) { |
2373 | error = -ENOENT; | |
2374 | goto out; | |
2375 | } | |
2376 | ||
1da177e4 | 2377 | error = security_quota_on(dentry); |
84de856e | 2378 | if (!error) |
f55abc0f JK |
2379 | error = vfs_load_quota_inode(dentry->d_inode, type, format_id, |
2380 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
84de856e | 2381 | |
154f484b | 2382 | out: |
84de856e CH |
2383 | dput(dentry); |
2384 | return error; | |
1da177e4 | 2385 | } |
287a8095 | 2386 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2387 | |
12095460 JK |
2388 | static inline qsize_t qbtos(qsize_t blocks) |
2389 | { | |
2390 | return blocks << QIF_DQBLKSIZE_BITS; | |
2391 | } | |
2392 | ||
2393 | static inline qsize_t stoqb(qsize_t space) | |
2394 | { | |
2395 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
2396 | } | |
2397 | ||
1da177e4 | 2398 | /* Generic routine for getting common part of quota structure */ |
b9b2dd36 | 2399 | static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2400 | { |
2401 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2402 | ||
b9b2dd36 CH |
2403 | memset(di, 0, sizeof(*di)); |
2404 | di->d_version = FS_DQUOT_VERSION; | |
4c376dca | 2405 | di->d_flags = dquot->dq_id.type == USRQUOTA ? |
ade7ce31 | 2406 | FS_USER_QUOTA : FS_GROUP_QUOTA; |
4c376dca | 2407 | di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id); |
b9b2dd36 | 2408 | |
1da177e4 | 2409 | spin_lock(&dq_data_lock); |
b9b2dd36 CH |
2410 | di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); |
2411 | di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); | |
2412 | di->d_ino_hardlimit = dm->dqb_ihardlimit; | |
2413 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
2414 | di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; | |
2415 | di->d_icount = dm->dqb_curinodes; | |
2416 | di->d_btimer = dm->dqb_btime; | |
2417 | di->d_itimer = dm->dqb_itime; | |
1da177e4 LT |
2418 | spin_unlock(&dq_data_lock); |
2419 | } | |
2420 | ||
74a8a103 | 2421 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
287a8095 | 2422 | struct fs_disk_quota *di) |
1da177e4 LT |
2423 | { |
2424 | struct dquot *dquot; | |
2425 | ||
aca645a6 | 2426 | dquot = dqget(sb, qid); |
dd6f3c6d | 2427 | if (!dquot) |
1da177e4 | 2428 | return -ESRCH; |
1da177e4 LT |
2429 | do_get_dqblk(dquot, di); |
2430 | dqput(dquot); | |
cc33412f | 2431 | |
1da177e4 LT |
2432 | return 0; |
2433 | } | |
287a8095 | 2434 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2435 | |
c472b432 CH |
2436 | #define VFS_FS_DQ_MASK \ |
2437 | (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ | |
2438 | FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ | |
2439 | FS_DQ_BTIMER | FS_DQ_ITIMER) | |
2440 | ||
1da177e4 | 2441 | /* Generic routine for setting common part of quota structure */ |
c472b432 | 2442 | static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) |
1da177e4 LT |
2443 | { |
2444 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2445 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2446 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2447 | |
c472b432 CH |
2448 | if (di->d_fieldmask & ~VFS_FS_DQ_MASK) |
2449 | return -EINVAL; | |
2450 | ||
2451 | if (((di->d_fieldmask & FS_DQ_BSOFT) && | |
2452 | (di->d_blk_softlimit > dqi->dqi_maxblimit)) || | |
2453 | ((di->d_fieldmask & FS_DQ_BHARD) && | |
2454 | (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || | |
2455 | ((di->d_fieldmask & FS_DQ_ISOFT) && | |
2456 | (di->d_ino_softlimit > dqi->dqi_maxilimit)) || | |
2457 | ((di->d_fieldmask & FS_DQ_IHARD) && | |
2458 | (di->d_ino_hardlimit > dqi->dqi_maxilimit))) | |
338bf9af | 2459 | return -ERANGE; |
1da177e4 LT |
2460 | |
2461 | spin_lock(&dq_data_lock); | |
c472b432 CH |
2462 | if (di->d_fieldmask & FS_DQ_BCOUNT) { |
2463 | dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; | |
1da177e4 | 2464 | check_blim = 1; |
08261673 | 2465 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2466 | } |
c472b432 CH |
2467 | |
2468 | if (di->d_fieldmask & FS_DQ_BSOFT) | |
2469 | dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); | |
2470 | if (di->d_fieldmask & FS_DQ_BHARD) | |
2471 | dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); | |
2472 | if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { | |
1da177e4 | 2473 | check_blim = 1; |
08261673 | 2474 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2475 | } |
c472b432 CH |
2476 | |
2477 | if (di->d_fieldmask & FS_DQ_ICOUNT) { | |
2478 | dm->dqb_curinodes = di->d_icount; | |
1da177e4 | 2479 | check_ilim = 1; |
08261673 | 2480 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2481 | } |
c472b432 CH |
2482 | |
2483 | if (di->d_fieldmask & FS_DQ_ISOFT) | |
2484 | dm->dqb_isoftlimit = di->d_ino_softlimit; | |
2485 | if (di->d_fieldmask & FS_DQ_IHARD) | |
2486 | dm->dqb_ihardlimit = di->d_ino_hardlimit; | |
2487 | if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { | |
1da177e4 | 2488 | check_ilim = 1; |
08261673 | 2489 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2490 | } |
c472b432 CH |
2491 | |
2492 | if (di->d_fieldmask & FS_DQ_BTIMER) { | |
2493 | dm->dqb_btime = di->d_btimer; | |
e04a88a9 | 2494 | check_blim = 1; |
08261673 | 2495 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2496 | } |
c472b432 CH |
2497 | |
2498 | if (di->d_fieldmask & FS_DQ_ITIMER) { | |
2499 | dm->dqb_itime = di->d_itimer; | |
e04a88a9 | 2500 | check_ilim = 1; |
08261673 | 2501 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2502 | } |
1da177e4 LT |
2503 | |
2504 | if (check_blim) { | |
268157ba JK |
2505 | if (!dm->dqb_bsoftlimit || |
2506 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2507 | dm->dqb_btime = 0; |
2508 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
c472b432 | 2509 | } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) |
268157ba | 2510 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2511 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2512 | } |
2513 | if (check_ilim) { | |
268157ba JK |
2514 | if (!dm->dqb_isoftlimit || |
2515 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2516 | dm->dqb_itime = 0; |
2517 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
c472b432 | 2518 | } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) |
268157ba | 2519 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2520 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2521 | } |
268157ba JK |
2522 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2523 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2524 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2525 | else | |
2526 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2527 | spin_unlock(&dq_data_lock); | |
2528 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2529 | |
2530 | return 0; | |
1da177e4 LT |
2531 | } |
2532 | ||
74a8a103 | 2533 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
c472b432 | 2534 | struct fs_disk_quota *di) |
1da177e4 LT |
2535 | { |
2536 | struct dquot *dquot; | |
338bf9af | 2537 | int rc; |
1da177e4 | 2538 | |
aca645a6 | 2539 | dquot = dqget(sb, qid); |
f55abc0f JK |
2540 | if (!dquot) { |
2541 | rc = -ESRCH; | |
2542 | goto out; | |
1da177e4 | 2543 | } |
338bf9af | 2544 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2545 | dqput(dquot); |
f55abc0f | 2546 | out: |
338bf9af | 2547 | return rc; |
1da177e4 | 2548 | } |
287a8095 | 2549 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2550 | |
2551 | /* Generic routine for getting common part of quota file information */ | |
287a8095 | 2552 | int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) |
1da177e4 LT |
2553 | { |
2554 | struct mem_dqinfo *mi; | |
2555 | ||
d3be915f | 2556 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2557 | if (!sb_has_quota_active(sb, type)) { |
d3be915f | 2558 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2559 | return -ESRCH; |
2560 | } | |
2561 | mi = sb_dqopt(sb)->info + type; | |
2562 | spin_lock(&dq_data_lock); | |
2563 | ii->dqi_bgrace = mi->dqi_bgrace; | |
2564 | ii->dqi_igrace = mi->dqi_igrace; | |
46fe44ce | 2565 | ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; |
1da177e4 LT |
2566 | ii->dqi_valid = IIF_ALL; |
2567 | spin_unlock(&dq_data_lock); | |
d3be915f | 2568 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2569 | return 0; |
2570 | } | |
287a8095 | 2571 | EXPORT_SYMBOL(dquot_get_dqinfo); |
1da177e4 LT |
2572 | |
2573 | /* Generic routine for setting common part of quota file information */ | |
287a8095 | 2574 | int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) |
1da177e4 LT |
2575 | { |
2576 | struct mem_dqinfo *mi; | |
f55abc0f | 2577 | int err = 0; |
1da177e4 | 2578 | |
d3be915f | 2579 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2580 | if (!sb_has_quota_active(sb, type)) { |
2581 | err = -ESRCH; | |
2582 | goto out; | |
1da177e4 LT |
2583 | } |
2584 | mi = sb_dqopt(sb)->info + type; | |
ca6cb091 JK |
2585 | if (ii->dqi_valid & IIF_FLAGS) { |
2586 | if (ii->dqi_flags & ~DQF_SETINFO_MASK || | |
2587 | (ii->dqi_flags & DQF_ROOT_SQUASH && | |
2588 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) { | |
2589 | err = -EINVAL; | |
2590 | goto out; | |
2591 | } | |
2592 | } | |
1da177e4 LT |
2593 | spin_lock(&dq_data_lock); |
2594 | if (ii->dqi_valid & IIF_BGRACE) | |
2595 | mi->dqi_bgrace = ii->dqi_bgrace; | |
2596 | if (ii->dqi_valid & IIF_IGRACE) | |
2597 | mi->dqi_igrace = ii->dqi_igrace; | |
2598 | if (ii->dqi_valid & IIF_FLAGS) | |
46fe44ce JK |
2599 | mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | |
2600 | (ii->dqi_flags & DQF_SETINFO_MASK); | |
1da177e4 LT |
2601 | spin_unlock(&dq_data_lock); |
2602 | mark_info_dirty(sb, type); | |
2603 | /* Force write to disk */ | |
2604 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2605 | out: |
d3be915f | 2606 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2607 | return err; |
1da177e4 | 2608 | } |
287a8095 | 2609 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2610 | |
287a8095 CH |
2611 | const struct quotactl_ops dquot_quotactl_ops = { |
2612 | .quota_on = dquot_quota_on, | |
2613 | .quota_off = dquot_quota_off, | |
2614 | .quota_sync = dquot_quota_sync, | |
2615 | .get_info = dquot_get_dqinfo, | |
2616 | .set_info = dquot_set_dqinfo, | |
2617 | .get_dqblk = dquot_get_dqblk, | |
2618 | .set_dqblk = dquot_set_dqblk | |
1da177e4 | 2619 | }; |
287a8095 | 2620 | EXPORT_SYMBOL(dquot_quotactl_ops); |
dde95888 DM |
2621 | |
2622 | static int do_proc_dqstats(struct ctl_table *table, int write, | |
2623 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2624 | { | |
dde95888 | 2625 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2626 | |
2627 | /* Update global table */ | |
2628 | dqstats.stat[type] = | |
2629 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2630 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2631 | } | |
2632 | ||
e628753b | 2633 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2634 | { |
1da177e4 | 2635 | .procname = "lookups", |
dde95888 | 2636 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2637 | .maxlen = sizeof(int), |
2638 | .mode = 0444, | |
dde95888 | 2639 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2640 | }, |
2641 | { | |
1da177e4 | 2642 | .procname = "drops", |
dde95888 | 2643 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2644 | .maxlen = sizeof(int), |
2645 | .mode = 0444, | |
dde95888 | 2646 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2647 | }, |
2648 | { | |
1da177e4 | 2649 | .procname = "reads", |
dde95888 | 2650 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2651 | .maxlen = sizeof(int), |
2652 | .mode = 0444, | |
dde95888 | 2653 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2654 | }, |
2655 | { | |
1da177e4 | 2656 | .procname = "writes", |
dde95888 | 2657 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2658 | .maxlen = sizeof(int), |
2659 | .mode = 0444, | |
dde95888 | 2660 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2661 | }, |
2662 | { | |
1da177e4 | 2663 | .procname = "cache_hits", |
dde95888 | 2664 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2665 | .maxlen = sizeof(int), |
2666 | .mode = 0444, | |
dde95888 | 2667 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2668 | }, |
2669 | { | |
1da177e4 | 2670 | .procname = "allocated_dquots", |
dde95888 | 2671 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2672 | .maxlen = sizeof(int), |
2673 | .mode = 0444, | |
dde95888 | 2674 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2675 | }, |
2676 | { | |
1da177e4 | 2677 | .procname = "free_dquots", |
dde95888 | 2678 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2679 | .maxlen = sizeof(int), |
2680 | .mode = 0444, | |
dde95888 | 2681 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2682 | }, |
2683 | { | |
1da177e4 | 2684 | .procname = "syncs", |
dde95888 | 2685 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2686 | .maxlen = sizeof(int), |
2687 | .mode = 0444, | |
dde95888 | 2688 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2689 | }, |
8e893469 | 2690 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2691 | { |
1da177e4 LT |
2692 | .procname = "warnings", |
2693 | .data = &flag_print_warnings, | |
2694 | .maxlen = sizeof(int), | |
2695 | .mode = 0644, | |
6d456111 | 2696 | .proc_handler = proc_dointvec, |
1da177e4 | 2697 | }, |
8e893469 | 2698 | #endif |
ab09203e | 2699 | { }, |
1da177e4 LT |
2700 | }; |
2701 | ||
e628753b | 2702 | static struct ctl_table fs_table[] = { |
1da177e4 | 2703 | { |
1da177e4 LT |
2704 | .procname = "quota", |
2705 | .mode = 0555, | |
2706 | .child = fs_dqstats_table, | |
2707 | }, | |
ab09203e | 2708 | { }, |
1da177e4 LT |
2709 | }; |
2710 | ||
e628753b | 2711 | static struct ctl_table sys_table[] = { |
1da177e4 | 2712 | { |
1da177e4 LT |
2713 | .procname = "fs", |
2714 | .mode = 0555, | |
2715 | .child = fs_table, | |
2716 | }, | |
ab09203e | 2717 | { }, |
1da177e4 LT |
2718 | }; |
2719 | ||
2720 | static int __init dquot_init(void) | |
2721 | { | |
f32764bd | 2722 | int i, ret; |
1da177e4 LT |
2723 | unsigned long nr_hash, order; |
2724 | ||
2725 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2726 | ||
0b4d4147 | 2727 | register_sysctl_table(sys_table); |
1da177e4 | 2728 | |
20c2df83 | 2729 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2730 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2731 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2732 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2733 | NULL); |
1da177e4 LT |
2734 | |
2735 | order = 0; | |
2736 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2737 | if (!dquot_hash) | |
2738 | panic("Cannot create dquot hash table"); | |
2739 | ||
f32764bd | 2740 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2741 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2742 | if (ret) |
2743 | panic("Cannot create dquot stat counters"); | |
2744 | } | |
dde95888 | 2745 | |
1da177e4 LT |
2746 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2747 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2748 | dq_hash_bits = 0; | |
2749 | do { | |
2750 | dq_hash_bits++; | |
2751 | } while (nr_hash >> dq_hash_bits); | |
2752 | dq_hash_bits--; | |
2753 | ||
2754 | nr_hash = 1UL << dq_hash_bits; | |
2755 | dq_hash_mask = nr_hash - 1; | |
2756 | for (i = 0; i < nr_hash; i++) | |
2757 | INIT_HLIST_HEAD(dquot_hash + i); | |
2758 | ||
19858e7b AB |
2759 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2760 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2761 | |
8e1f936b | 2762 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2763 | |
2764 | return 0; | |
2765 | } | |
2766 | module_init(dquot_init); |