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); |
6184fc0b | 250 | static int __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; | |
044c9b67 JK |
414 | /* Make sure flags update is visible after dquot has been filled */ |
415 | smp_mb__before_atomic(); | |
1da177e4 LT |
416 | set_bit(DQ_READ_B, &dquot->dq_flags); |
417 | /* Instantiate dquot if needed */ | |
418 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 419 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 420 | /* Write the info if needed */ |
4c376dca EB |
421 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
422 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
423 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 424 | } |
1da177e4 LT |
425 | if (ret < 0) |
426 | goto out_iolock; | |
427 | if (ret2 < 0) { | |
428 | ret = ret2; | |
429 | goto out_iolock; | |
430 | } | |
431 | } | |
044c9b67 JK |
432 | /* |
433 | * Make sure flags update is visible after on-disk struct has been | |
434 | * allocated. Paired with smp_rmb() in dqget(). | |
435 | */ | |
436 | smp_mb__before_atomic(); | |
1da177e4 LT |
437 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
438 | out_iolock: | |
d3be915f IM |
439 | mutex_unlock(&dqopt->dqio_mutex); |
440 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
441 | return ret; |
442 | } | |
08d0350c | 443 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
444 | |
445 | /* | |
446 | * Write dquot to disk | |
447 | */ | |
448 | int dquot_commit(struct dquot *dquot) | |
449 | { | |
b03f2456 | 450 | int ret = 0; |
1da177e4 LT |
451 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
452 | ||
d3be915f | 453 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 LT |
454 | spin_lock(&dq_list_lock); |
455 | if (!clear_dquot_dirty(dquot)) { | |
456 | spin_unlock(&dq_list_lock); | |
457 | goto out_sem; | |
458 | } | |
459 | spin_unlock(&dq_list_lock); | |
460 | /* Inactive dquot can be only if there was error during read/init | |
461 | * => we have better not writing it */ | |
b03f2456 | 462 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 463 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
464 | else |
465 | ret = -EIO; | |
1da177e4 | 466 | out_sem: |
d3be915f | 467 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
468 | return ret; |
469 | } | |
08d0350c | 470 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
471 | |
472 | /* | |
473 | * Release dquot | |
474 | */ | |
475 | int dquot_release(struct dquot *dquot) | |
476 | { | |
477 | int ret = 0, ret2 = 0; | |
478 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
479 | ||
d3be915f | 480 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
481 | /* Check whether we are not racing with some other dqget() */ |
482 | if (atomic_read(&dquot->dq_count) > 1) | |
483 | goto out_dqlock; | |
d3be915f | 484 | mutex_lock(&dqopt->dqio_mutex); |
4c376dca EB |
485 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
486 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 487 | /* Write the info */ |
4c376dca EB |
488 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
489 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
490 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 491 | } |
1da177e4 LT |
492 | if (ret >= 0) |
493 | ret = ret2; | |
494 | } | |
495 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
d3be915f | 496 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 | 497 | out_dqlock: |
d3be915f | 498 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
499 | return ret; |
500 | } | |
08d0350c | 501 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 502 | |
7d9056ba | 503 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
504 | { |
505 | kmem_cache_free(dquot_cachep, dquot); | |
506 | } | |
7d9056ba | 507 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
508 | |
509 | static inline void do_destroy_dquot(struct dquot *dquot) | |
510 | { | |
511 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
512 | } | |
513 | ||
1da177e4 LT |
514 | /* Invalidate all dquots on the list. Note that this function is called after |
515 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
516 | * quota users. There can still be some users of quotas due to inodes being |
517 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 518 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 519 | */ |
1da177e4 LT |
520 | static void invalidate_dquots(struct super_block *sb, int type) |
521 | { | |
c33ed271 | 522 | struct dquot *dquot, *tmp; |
1da177e4 | 523 | |
6362e4d4 | 524 | restart: |
1da177e4 | 525 | spin_lock(&dq_list_lock); |
c33ed271 | 526 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
527 | if (dquot->dq_sb != sb) |
528 | continue; | |
4c376dca | 529 | if (dquot->dq_id.type != type) |
1da177e4 | 530 | continue; |
6362e4d4 JK |
531 | /* Wait for dquot users */ |
532 | if (atomic_read(&dquot->dq_count)) { | |
533 | DEFINE_WAIT(wait); | |
534 | ||
9f985cb6 | 535 | dqgrab(dquot); |
6362e4d4 JK |
536 | prepare_to_wait(&dquot->dq_wait_unused, &wait, |
537 | TASK_UNINTERRUPTIBLE); | |
538 | spin_unlock(&dq_list_lock); | |
539 | /* Once dqput() wakes us up, we know it's time to free | |
540 | * the dquot. | |
541 | * IMPORTANT: we rely on the fact that there is always | |
542 | * at most one process waiting for dquot to free. | |
543 | * Otherwise dq_count would be > 1 and we would never | |
544 | * wake up. | |
545 | */ | |
546 | if (atomic_read(&dquot->dq_count) > 1) | |
547 | schedule(); | |
548 | finish_wait(&dquot->dq_wait_unused, &wait); | |
549 | dqput(dquot); | |
550 | /* At this moment dquot() need not exist (it could be | |
551 | * reclaimed by prune_dqcache(). Hence we must | |
552 | * restart. */ | |
553 | goto restart; | |
554 | } | |
555 | /* | |
556 | * Quota now has no users and it has been written on last | |
557 | * dqput() | |
558 | */ | |
1da177e4 LT |
559 | remove_dquot_hash(dquot); |
560 | remove_free_dquot(dquot); | |
561 | remove_inuse(dquot); | |
74f783af | 562 | do_destroy_dquot(dquot); |
1da177e4 LT |
563 | } |
564 | spin_unlock(&dq_list_lock); | |
565 | } | |
566 | ||
12c77527 JK |
567 | /* Call callback for every active dquot on given filesystem */ |
568 | int dquot_scan_active(struct super_block *sb, | |
569 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
570 | unsigned long priv) | |
571 | { | |
572 | struct dquot *dquot, *old_dquot = NULL; | |
573 | int ret = 0; | |
574 | ||
575 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); | |
576 | spin_lock(&dq_list_lock); | |
577 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
578 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
579 | continue; | |
580 | if (dquot->dq_sb != sb) | |
581 | continue; | |
582 | /* Now we have active dquot so we can just increase use count */ | |
583 | atomic_inc(&dquot->dq_count); | |
12c77527 | 584 | spin_unlock(&dq_list_lock); |
dde95888 | 585 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
586 | dqput(old_dquot); |
587 | old_dquot = dquot; | |
1362f4ea JK |
588 | /* |
589 | * ->release_dquot() can be racing with us. Our reference | |
590 | * protects us from new calls to it so just wait for any | |
591 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
592 | */ | |
593 | wait_on_dquot(dquot); | |
594 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
595 | ret = fn(dquot, priv); | |
596 | if (ret < 0) | |
597 | goto out; | |
598 | } | |
12c77527 JK |
599 | spin_lock(&dq_list_lock); |
600 | /* We are safe to continue now because our dquot could not | |
601 | * be moved out of the inuse list while we hold the reference */ | |
602 | } | |
603 | spin_unlock(&dq_list_lock); | |
604 | out: | |
605 | dqput(old_dquot); | |
606 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); | |
607 | return ret; | |
608 | } | |
08d0350c | 609 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 610 | |
ceed1723 JK |
611 | /* Write all dquot structures to quota files */ |
612 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
613 | { |
614 | struct list_head *dirty; | |
615 | struct dquot *dquot; | |
616 | struct quota_info *dqopt = sb_dqopt(sb); | |
617 | int cnt; | |
ceed1723 | 618 | int err, ret = 0; |
1da177e4 | 619 | |
d3be915f | 620 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
621 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
622 | if (type != -1 && cnt != type) | |
623 | continue; | |
f55abc0f | 624 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
625 | continue; |
626 | spin_lock(&dq_list_lock); | |
627 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
628 | while (!list_empty(dirty)) { | |
268157ba JK |
629 | dquot = list_first_entry(dirty, struct dquot, |
630 | dq_dirty); | |
1da177e4 LT |
631 | /* Dirty and inactive can be only bad dquot... */ |
632 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
633 | clear_dquot_dirty(dquot); | |
634 | continue; | |
635 | } | |
636 | /* Now we have active dquot from which someone is | |
637 | * holding reference so we can safely just increase | |
638 | * use count */ | |
9f985cb6 | 639 | dqgrab(dquot); |
1da177e4 | 640 | spin_unlock(&dq_list_lock); |
dde95888 | 641 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 JK |
642 | err = sb->dq_op->write_dquot(dquot); |
643 | if (!ret && err) | |
474d2605 | 644 | ret = err; |
1da177e4 LT |
645 | dqput(dquot); |
646 | spin_lock(&dq_list_lock); | |
647 | } | |
648 | spin_unlock(&dq_list_lock); | |
649 | } | |
650 | ||
651 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
652 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
653 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 654 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 655 | dqstats_inc(DQST_SYNCS); |
d3be915f | 656 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 | 657 | |
ceed1723 JK |
658 | return ret; |
659 | } | |
660 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
661 | ||
662 | /* Write all dquot structures to disk and make them visible from userspace */ | |
663 | int dquot_quota_sync(struct super_block *sb, int type) | |
664 | { | |
665 | struct quota_info *dqopt = sb_dqopt(sb); | |
666 | int cnt; | |
667 | int ret; | |
668 | ||
669 | ret = dquot_writeback_dquots(sb, type); | |
670 | if (ret) | |
671 | return ret; | |
672 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
673 | return 0; |
674 | ||
675 | /* This is not very clever (and fast) but currently I don't know about | |
676 | * any other simple way of getting quota data to disk and we must get | |
677 | * them there for userspace to be visible... */ | |
678 | if (sb->s_op->sync_fs) | |
679 | sb->s_op->sync_fs(sb, 1); | |
680 | sync_blockdev(sb->s_bdev); | |
681 | ||
682 | /* | |
683 | * Now when everything is written we can discard the pagecache so | |
684 | * that userspace sees the changes. | |
685 | */ | |
f9ef1784 | 686 | mutex_lock(&dqopt->dqonoff_mutex); |
5fb324ad CH |
687 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
688 | if (type != -1 && cnt != type) | |
689 | continue; | |
690 | if (!sb_has_quota_active(sb, cnt)) | |
691 | continue; | |
5955102c | 692 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 693 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 694 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 695 | } |
f9ef1784 | 696 | mutex_unlock(&dqopt->dqonoff_mutex); |
5fb324ad | 697 | |
1da177e4 LT |
698 | return 0; |
699 | } | |
287a8095 | 700 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 701 | |
1ab6c499 DC |
702 | static unsigned long |
703 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 LT |
704 | { |
705 | struct list_head *head; | |
706 | struct dquot *dquot; | |
1ab6c499 | 707 | unsigned long freed = 0; |
1da177e4 | 708 | |
d68aab6b | 709 | spin_lock(&dq_list_lock); |
1da177e4 | 710 | head = free_dquots.prev; |
1ab6c499 | 711 | while (head != &free_dquots && sc->nr_to_scan) { |
1da177e4 LT |
712 | dquot = list_entry(head, struct dquot, dq_free); |
713 | remove_dquot_hash(dquot); | |
714 | remove_free_dquot(dquot); | |
715 | remove_inuse(dquot); | |
74f783af | 716 | do_destroy_dquot(dquot); |
1ab6c499 DC |
717 | sc->nr_to_scan--; |
718 | freed++; | |
1da177e4 LT |
719 | head = free_dquots.prev; |
720 | } | |
d68aab6b | 721 | spin_unlock(&dq_list_lock); |
1ab6c499 | 722 | return freed; |
1da177e4 LT |
723 | } |
724 | ||
1ab6c499 DC |
725 | static unsigned long |
726 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 727 | { |
55f841ce GC |
728 | return vfs_pressure_ratio( |
729 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
730 | } |
731 | ||
8e1f936b | 732 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
733 | .count_objects = dqcache_shrink_count, |
734 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
735 | .seeks = DEFAULT_SEEKS, |
736 | }; | |
737 | ||
1da177e4 LT |
738 | /* |
739 | * Put reference to dquot | |
1da177e4 | 740 | */ |
3d9ea253 | 741 | void dqput(struct dquot *dquot) |
1da177e4 | 742 | { |
b48d3805 JK |
743 | int ret; |
744 | ||
1da177e4 LT |
745 | if (!dquot) |
746 | return; | |
62af9b52 | 747 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 748 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 749 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
750 | quotatypes[dquot->dq_id.type], |
751 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
752 | BUG(); |
753 | } | |
754 | #endif | |
dde95888 | 755 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
756 | we_slept: |
757 | spin_lock(&dq_list_lock); | |
758 | if (atomic_read(&dquot->dq_count) > 1) { | |
759 | /* We have more than one user... nothing to do */ | |
760 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 761 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 762 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 JK |
763 | atomic_read(&dquot->dq_count) == 1) |
764 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
765 | spin_unlock(&dq_list_lock); |
766 | return; | |
767 | } | |
768 | /* Need to release dquot? */ | |
769 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
770 | spin_unlock(&dq_list_lock); | |
771 | /* Commit dquot before releasing */ | |
b48d3805 JK |
772 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
773 | if (ret < 0) { | |
fb5ffb0e JZ |
774 | quota_error(dquot->dq_sb, "Can't write quota structure" |
775 | " (error %d). Quota may get out of sync!", | |
776 | ret); | |
b48d3805 JK |
777 | /* |
778 | * We clear dirty bit anyway, so that we avoid | |
779 | * infinite loop here | |
780 | */ | |
781 | spin_lock(&dq_list_lock); | |
782 | clear_dquot_dirty(dquot); | |
783 | spin_unlock(&dq_list_lock); | |
784 | } | |
1da177e4 LT |
785 | goto we_slept; |
786 | } | |
787 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
788 | clear_dquot_dirty(dquot); | |
789 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
790 | spin_unlock(&dq_list_lock); | |
791 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
792 | goto we_slept; | |
793 | } | |
794 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 795 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 796 | /* sanity check */ |
8abf6a47 | 797 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
798 | #endif |
799 | put_dquot_last(dquot); | |
800 | spin_unlock(&dq_list_lock); | |
801 | } | |
08d0350c | 802 | EXPORT_SYMBOL(dqput); |
1da177e4 | 803 | |
7d9056ba | 804 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
805 | { |
806 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
807 | } | |
7d9056ba | 808 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 809 | |
1da177e4 LT |
810 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
811 | { | |
812 | struct dquot *dquot; | |
813 | ||
74f783af | 814 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 815 | if(!dquot) |
dd6f3c6d | 816 | return NULL; |
1da177e4 | 817 | |
d3be915f | 818 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
819 | INIT_LIST_HEAD(&dquot->dq_free); |
820 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
821 | INIT_HLIST_NODE(&dquot->dq_hash); | |
822 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 823 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 | 824 | dquot->dq_sb = sb; |
1a06d420 | 825 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 LT |
826 | atomic_set(&dquot->dq_count, 1); |
827 | ||
828 | return dquot; | |
829 | } | |
830 | ||
831 | /* | |
832 | * Get reference to dquot | |
cc33412f JK |
833 | * |
834 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
835 | * destroying our dquot by: | |
836 | * a) checking for quota flags under dq_list_lock and | |
837 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 838 | */ |
aca645a6 | 839 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 840 | { |
1a06d420 | 841 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 842 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 843 | |
1a06d420 | 844 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 845 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
846 | we_slept: |
847 | spin_lock(&dq_list_lock); | |
cc33412f | 848 | spin_lock(&dq_state_lock); |
1a06d420 | 849 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
850 | spin_unlock(&dq_state_lock); |
851 | spin_unlock(&dq_list_lock); | |
6184fc0b | 852 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
853 | goto out; |
854 | } | |
855 | spin_unlock(&dq_state_lock); | |
856 | ||
1a06d420 | 857 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
858 | if (!dquot) { |
859 | if (!empty) { | |
1da177e4 | 860 | spin_unlock(&dq_list_lock); |
1a06d420 | 861 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 862 | if (!empty) |
1da177e4 LT |
863 | schedule(); /* Try to wait for a moment... */ |
864 | goto we_slept; | |
865 | } | |
866 | dquot = empty; | |
dd6f3c6d | 867 | empty = NULL; |
4c376dca | 868 | dquot->dq_id = qid; |
1da177e4 LT |
869 | /* all dquots go on the inuse_list */ |
870 | put_inuse(dquot); | |
871 | /* hash it first so it can be found */ | |
872 | insert_dquot_hash(dquot); | |
1da177e4 | 873 | spin_unlock(&dq_list_lock); |
dde95888 | 874 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
875 | } else { |
876 | if (!atomic_read(&dquot->dq_count)) | |
877 | remove_free_dquot(dquot); | |
878 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 879 | spin_unlock(&dq_list_lock); |
dde95888 DM |
880 | dqstats_inc(DQST_CACHE_HITS); |
881 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 882 | } |
268157ba JK |
883 | /* Wait for dq_lock - after this we know that either dquot_release() is |
884 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 885 | wait_on_dquot(dquot); |
268157ba | 886 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
887 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
888 | int err; | |
889 | ||
890 | err = sb->dq_op->acquire_dquot(dquot); | |
891 | if (err < 0) { | |
892 | dqput(dquot); | |
893 | dquot = ERR_PTR(err); | |
894 | goto out; | |
895 | } | |
1da177e4 | 896 | } |
044c9b67 JK |
897 | /* |
898 | * Make sure following reads see filled structure - paired with | |
899 | * smp_mb__before_atomic() in dquot_acquire(). | |
900 | */ | |
901 | smp_rmb(); | |
62af9b52 | 902 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 903 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 904 | #endif |
cc33412f JK |
905 | out: |
906 | if (empty) | |
907 | do_destroy_dquot(empty); | |
1da177e4 LT |
908 | |
909 | return dquot; | |
910 | } | |
08d0350c | 911 | EXPORT_SYMBOL(dqget); |
1da177e4 | 912 | |
2d0fa467 JK |
913 | static inline struct dquot **i_dquot(struct inode *inode) |
914 | { | |
2d0fa467 JK |
915 | return inode->i_sb->s_op->get_dquots(inode); |
916 | } | |
917 | ||
1da177e4 LT |
918 | static int dqinit_needed(struct inode *inode, int type) |
919 | { | |
5bcd3b6f | 920 | struct dquot * const *dquots; |
1da177e4 LT |
921 | int cnt; |
922 | ||
923 | if (IS_NOQUOTA(inode)) | |
924 | return 0; | |
5bcd3b6f KK |
925 | |
926 | dquots = i_dquot(inode); | |
1da177e4 | 927 | if (type != -1) |
5bcd3b6f | 928 | return !dquots[type]; |
1da177e4 | 929 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 930 | if (!dquots[cnt]) |
1da177e4 LT |
931 | return 1; |
932 | return 0; | |
933 | } | |
934 | ||
d3be915f | 935 | /* This routine is guarded by dqonoff_mutex mutex */ |
1da177e4 LT |
936 | static void add_dquot_ref(struct super_block *sb, int type) |
937 | { | |
941d2380 | 938 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 939 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 940 | int reserved = 0; |
4c5e6c0e | 941 | #endif |
1da177e4 | 942 | |
74278da9 | 943 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 944 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
945 | spin_lock(&inode->i_lock); |
946 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
947 | !atomic_read(&inode->i_writecount) || | |
948 | !dqinit_needed(inode, type)) { | |
949 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 950 | continue; |
250df6ed | 951 | } |
d003fb70 | 952 | __iget(inode); |
250df6ed | 953 | spin_unlock(&inode->i_lock); |
74278da9 | 954 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 955 | |
d7e97117 JK |
956 | #ifdef CONFIG_QUOTA_DEBUG |
957 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
958 | reserved = 1; | |
959 | #endif | |
941d2380 | 960 | iput(old_inode); |
871a2931 | 961 | __dquot_initialize(inode, type); |
55fa6091 DC |
962 | |
963 | /* | |
964 | * We hold a reference to 'inode' so it couldn't have been | |
965 | * removed from s_inodes list while we dropped the | |
74278da9 | 966 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 967 | * holding the last reference and we cannot iput it under |
74278da9 | 968 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
969 | * later. |
970 | */ | |
941d2380 | 971 | old_inode = inode; |
74278da9 | 972 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 973 | } |
74278da9 | 974 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 975 | iput(old_inode); |
0a5a9c72 | 976 | |
62af9b52 | 977 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 978 | if (reserved) { |
fb5ffb0e JZ |
979 | quota_error(sb, "Writes happened before quota was turned on " |
980 | "thus quota information is probably inconsistent. " | |
981 | "Please run quotacheck(8)"); | |
0a5a9c72 | 982 | } |
4c5e6c0e | 983 | #endif |
1da177e4 LT |
984 | } |
985 | ||
268157ba JK |
986 | /* |
987 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 988 | * if we have the last reference to dquot |
268157ba | 989 | */ |
9eb6463f NY |
990 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
991 | struct list_head *tofree_head) | |
1da177e4 | 992 | { |
5bcd3b6f KK |
993 | struct dquot **dquots = i_dquot(inode); |
994 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 995 | |
9eb6463f NY |
996 | if (!dquot) |
997 | return; | |
998 | ||
5bcd3b6f | 999 | dquots[type] = NULL; |
9eb6463f NY |
1000 | if (list_empty(&dquot->dq_free)) { |
1001 | /* | |
1002 | * The inode still has reference to dquot so it can't be in the | |
1003 | * free list | |
1004 | */ | |
1005 | spin_lock(&dq_list_lock); | |
1006 | list_add(&dquot->dq_free, tofree_head); | |
1007 | spin_unlock(&dq_list_lock); | |
1008 | } else { | |
1009 | /* | |
1010 | * Dquot is already in a list to put so we won't drop the last | |
1011 | * reference here. | |
1012 | */ | |
1013 | dqput(dquot); | |
1da177e4 | 1014 | } |
1da177e4 LT |
1015 | } |
1016 | ||
268157ba JK |
1017 | /* |
1018 | * Free list of dquots | |
1019 | * Dquots are removed from inodes and no new references can be got so we are | |
1020 | * the only ones holding reference | |
1021 | */ | |
1da177e4 LT |
1022 | static void put_dquot_list(struct list_head *tofree_head) |
1023 | { | |
1024 | struct list_head *act_head; | |
1025 | struct dquot *dquot; | |
1026 | ||
1027 | act_head = tofree_head->next; | |
1da177e4 LT |
1028 | while (act_head != tofree_head) { |
1029 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1030 | act_head = act_head->next; | |
268157ba JK |
1031 | /* Remove dquot from the list so we won't have problems... */ |
1032 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1033 | dqput(dquot); |
1034 | } | |
1035 | } | |
1036 | ||
fb58b731 CH |
1037 | static void remove_dquot_ref(struct super_block *sb, int type, |
1038 | struct list_head *tofree_head) | |
1039 | { | |
1040 | struct inode *inode; | |
7af9cce8 | 1041 | int reserved = 0; |
fb58b731 | 1042 | |
74278da9 | 1043 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1044 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1045 | /* |
1046 | * We have to scan also I_NEW inodes because they can already | |
1047 | * have quota pointer initialized. Luckily, we need to touch | |
1048 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1049 | * (dq_data_lock). |
aabb8fdb | 1050 | */ |
b9ba6f94 | 1051 | spin_lock(&dq_data_lock); |
7af9cce8 DM |
1052 | if (!IS_NOQUOTA(inode)) { |
1053 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1054 | reserved = 1; | |
fb58b731 | 1055 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1056 | } |
b9ba6f94 | 1057 | spin_unlock(&dq_data_lock); |
fb58b731 | 1058 | } |
74278da9 | 1059 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1060 | #ifdef CONFIG_QUOTA_DEBUG |
1061 | if (reserved) { | |
1062 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1063 | " was disabled thus quota information is probably " | |
1064 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1065 | } | |
1066 | #endif | |
fb58b731 CH |
1067 | } |
1068 | ||
1da177e4 LT |
1069 | /* Gather all references from inodes and drop them */ |
1070 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1071 | { | |
1072 | LIST_HEAD(tofree_head); | |
1073 | ||
fb58b731 | 1074 | if (sb->dq_op) { |
fb58b731 | 1075 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1076 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1077 | put_dquot_list(&tofree_head); |
1078 | } | |
1da177e4 LT |
1079 | } |
1080 | ||
12095460 | 1081 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1082 | { |
1083 | dquot->dq_dqb.dqb_curinodes += number; | |
1084 | } | |
1085 | ||
1086 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1087 | { | |
1088 | dquot->dq_dqb.dqb_curspace += number; | |
1089 | } | |
1090 | ||
f18df228 MC |
1091 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1092 | { | |
1093 | dquot->dq_dqb.dqb_rsvspace += number; | |
1094 | } | |
1095 | ||
740d9dcd MC |
1096 | /* |
1097 | * Claim reserved quota space | |
1098 | */ | |
0a5a9c72 | 1099 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1100 | { |
0a5a9c72 JK |
1101 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1102 | WARN_ON_ONCE(1); | |
1103 | number = dquot->dq_dqb.dqb_rsvspace; | |
1104 | } | |
740d9dcd MC |
1105 | dquot->dq_dqb.dqb_curspace += number; |
1106 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1107 | } | |
1108 | ||
1c8924eb JK |
1109 | static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) |
1110 | { | |
1111 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) | |
1112 | number = dquot->dq_dqb.dqb_curspace; | |
1113 | dquot->dq_dqb.dqb_rsvspace += number; | |
1114 | dquot->dq_dqb.dqb_curspace -= number; | |
1115 | } | |
1116 | ||
740d9dcd MC |
1117 | static inline |
1118 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1119 | { | |
0a5a9c72 JK |
1120 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1121 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1122 | else { | |
1123 | WARN_ON_ONCE(1); | |
1124 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1125 | } | |
740d9dcd MC |
1126 | } |
1127 | ||
7a2435d8 | 1128 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1129 | { |
db49d2df JK |
1130 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1131 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1132 | dquot->dq_dqb.dqb_curinodes -= number; |
1133 | else | |
1134 | dquot->dq_dqb.dqb_curinodes = 0; | |
1135 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
1136 | dquot->dq_dqb.dqb_itime = (time_t) 0; | |
1137 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
1138 | } | |
1139 | ||
7a2435d8 | 1140 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1141 | { |
db49d2df JK |
1142 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1143 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1144 | dquot->dq_dqb.dqb_curspace -= number; |
1145 | else | |
1146 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1147 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
1da177e4 LT |
1148 | dquot->dq_dqb.dqb_btime = (time_t) 0; |
1149 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
1150 | } | |
1151 | ||
bf097aaf JK |
1152 | struct dquot_warn { |
1153 | struct super_block *w_sb; | |
7b9c7321 | 1154 | struct kqid w_dq_id; |
bf097aaf JK |
1155 | short w_type; |
1156 | }; | |
1157 | ||
c525460e JK |
1158 | static int warning_issued(struct dquot *dquot, const int warntype) |
1159 | { | |
1160 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1161 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1162 | ((warntype == QUOTA_NL_IHARDWARN || | |
1163 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1164 | ||
1165 | if (!flag) | |
1166 | return 0; | |
1167 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1168 | } | |
1169 | ||
8e893469 | 1170 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1171 | static int flag_print_warnings = 1; |
1172 | ||
bf097aaf | 1173 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1174 | { |
1175 | if (!flag_print_warnings) | |
1176 | return 0; | |
1177 | ||
7b9c7321 | 1178 | switch (warn->w_dq_id.type) { |
1da177e4 | 1179 | case USRQUOTA: |
1a06d420 | 1180 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1181 | case GRPQUOTA: |
7b9c7321 | 1182 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1183 | case PRJQUOTA: |
1184 | return 1; | |
1da177e4 LT |
1185 | } |
1186 | return 0; | |
1187 | } | |
1188 | ||
1da177e4 | 1189 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1190 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1191 | { |
1192 | char *msg = NULL; | |
24ec839c | 1193 | struct tty_struct *tty; |
bf097aaf | 1194 | int warntype = warn->w_type; |
1da177e4 | 1195 | |
657d3bfa JK |
1196 | if (warntype == QUOTA_NL_IHARDBELOW || |
1197 | warntype == QUOTA_NL_ISOFTBELOW || | |
1198 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1199 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1200 | return; |
1201 | ||
24ec839c PZ |
1202 | tty = get_current_tty(); |
1203 | if (!tty) | |
452a00d2 | 1204 | return; |
bf097aaf | 1205 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1206 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1207 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1208 | else |
24ec839c | 1209 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1210 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1211 | switch (warntype) { |
8e893469 | 1212 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1213 | msg = " file limit reached.\r\n"; |
1214 | break; | |
8e893469 | 1215 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1216 | msg = " file quota exceeded too long.\r\n"; |
1217 | break; | |
8e893469 | 1218 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1219 | msg = " file quota exceeded.\r\n"; |
1220 | break; | |
8e893469 | 1221 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1222 | msg = " block limit reached.\r\n"; |
1223 | break; | |
8e893469 | 1224 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1225 | msg = " block quota exceeded too long.\r\n"; |
1226 | break; | |
8e893469 | 1227 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1228 | msg = " block quota exceeded.\r\n"; |
1229 | break; | |
1230 | } | |
24ec839c | 1231 | tty_write_message(tty, msg); |
452a00d2 | 1232 | tty_kref_put(tty); |
1da177e4 | 1233 | } |
8e893469 JK |
1234 | #endif |
1235 | ||
bf097aaf JK |
1236 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1237 | int warntype) | |
1238 | { | |
1239 | if (warning_issued(dquot, warntype)) | |
1240 | return; | |
1241 | warn->w_type = warntype; | |
1242 | warn->w_sb = dquot->dq_sb; | |
1243 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1244 | } |
1245 | ||
f18df228 MC |
1246 | /* |
1247 | * Write warnings to the console and send warning messages over netlink. | |
1248 | * | |
bf097aaf | 1249 | * Note that this function can call into tty and networking code. |
f18df228 | 1250 | */ |
bf097aaf | 1251 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1252 | { |
1253 | int i; | |
1254 | ||
86e931a3 | 1255 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1256 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1257 | continue; | |
8e893469 | 1258 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1259 | print_warning(&warn[i]); |
8e893469 | 1260 | #endif |
7b9c7321 | 1261 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1262 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1263 | } |
1da177e4 LT |
1264 | } |
1265 | ||
7a2435d8 | 1266 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1267 | { |
4c376dca | 1268 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1269 | |
1270 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1271 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1272 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | /* needs dq_data_lock */ | |
bf097aaf JK |
1276 | static int check_idq(struct dquot *dquot, qsize_t inodes, |
1277 | struct dquot_warn *warn) | |
1da177e4 | 1278 | { |
268157ba JK |
1279 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1280 | ||
4c376dca | 1281 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1282 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1283 | return 0; |
1da177e4 LT |
1284 | |
1285 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1286 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1287 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1288 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
efd8f0e6 | 1289 | return -EDQUOT; |
1da177e4 LT |
1290 | } |
1291 | ||
1292 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1293 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1294 | dquot->dq_dqb.dqb_itime && | |
1295 | get_seconds() >= dquot->dq_dqb.dqb_itime && | |
1da177e4 | 1296 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1297 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
efd8f0e6 | 1298 | return -EDQUOT; |
1da177e4 LT |
1299 | } |
1300 | ||
1301 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1302 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1303 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1304 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
268157ba | 1305 | dquot->dq_dqb.dqb_itime = get_seconds() + |
4c376dca | 1306 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 LT |
1307 | } |
1308 | ||
efd8f0e6 | 1309 | return 0; |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | /* needs dq_data_lock */ | |
bf097aaf JK |
1313 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, |
1314 | struct dquot_warn *warn) | |
1da177e4 | 1315 | { |
f18df228 | 1316 | qsize_t tspace; |
268157ba | 1317 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1318 | |
4c376dca | 1319 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1320 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1321 | return 0; |
1da177e4 | 1322 | |
f18df228 MC |
1323 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1324 | + space; | |
1325 | ||
1da177e4 | 1326 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1327 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1328 | !ignore_hardlimit(dquot)) { |
1329 | if (!prealloc) | |
bf097aaf | 1330 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
efd8f0e6 | 1331 | return -EDQUOT; |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1335 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba JK |
1336 | dquot->dq_dqb.dqb_btime && |
1337 | get_seconds() >= dquot->dq_dqb.dqb_btime && | |
1da177e4 LT |
1338 | !ignore_hardlimit(dquot)) { |
1339 | if (!prealloc) | |
bf097aaf | 1340 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
efd8f0e6 | 1341 | return -EDQUOT; |
1da177e4 LT |
1342 | } |
1343 | ||
1344 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1345 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1346 | dquot->dq_dqb.dqb_btime == 0) { |
1347 | if (!prealloc) { | |
bf097aaf | 1348 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
268157ba | 1349 | dquot->dq_dqb.dqb_btime = get_seconds() + |
4c376dca | 1350 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
1da177e4 LT |
1351 | } |
1352 | else | |
1353 | /* | |
1354 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1355 | * be always printed | |
1356 | */ | |
efd8f0e6 | 1357 | return -EDQUOT; |
1da177e4 LT |
1358 | } |
1359 | ||
efd8f0e6 | 1360 | return 0; |
1da177e4 LT |
1361 | } |
1362 | ||
12095460 | 1363 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1364 | { |
268157ba JK |
1365 | qsize_t newinodes; |
1366 | ||
657d3bfa | 1367 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1368 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1369 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1370 | return QUOTA_NL_NOWARN; |
1371 | ||
268157ba JK |
1372 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1373 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1374 | return QUOTA_NL_ISOFTBELOW; |
1375 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1376 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1377 | return QUOTA_NL_IHARDBELOW; |
1378 | return QUOTA_NL_NOWARN; | |
1379 | } | |
1380 | ||
1381 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1382 | { | |
1383 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1384 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1385 | return QUOTA_NL_NOWARN; |
1386 | ||
12095460 | 1387 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1388 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1389 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1390 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1391 | return QUOTA_NL_BHARDBELOW; |
1392 | return QUOTA_NL_NOWARN; | |
1393 | } | |
0a5a9c72 | 1394 | |
189eef59 CH |
1395 | static int dquot_active(const struct inode *inode) |
1396 | { | |
1397 | struct super_block *sb = inode->i_sb; | |
1398 | ||
1399 | if (IS_NOQUOTA(inode)) | |
1400 | return 0; | |
1401 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1402 | } | |
1403 | ||
1da177e4 | 1404 | /* |
871a2931 CH |
1405 | * Initialize quota pointers in inode |
1406 | * | |
871a2931 CH |
1407 | * It is better to call this function outside of any transaction as it |
1408 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1409 | */ |
6184fc0b | 1410 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1411 | { |
1ea06bec | 1412 | int cnt, init_needed = 0; |
ab73ef46 | 1413 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1414 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1415 | qsize_t rsv; |
6184fc0b | 1416 | int ret = 0; |
1da177e4 | 1417 | |
189eef59 | 1418 | if (!dquot_active(inode)) |
6184fc0b | 1419 | return 0; |
cc33412f | 1420 | |
5bcd3b6f KK |
1421 | dquots = i_dquot(inode); |
1422 | ||
cc33412f JK |
1423 | /* First get references to structures we might need. */ |
1424 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1425 | struct kqid qid; |
847aac64 LX |
1426 | kprojid_t projid; |
1427 | int rc; | |
6184fc0b | 1428 | struct dquot *dquot; |
847aac64 | 1429 | |
cc33412f JK |
1430 | if (type != -1 && cnt != type) |
1431 | continue; | |
1ea06bec NY |
1432 | /* |
1433 | * The i_dquot should have been initialized in most cases, | |
1434 | * we check it without locking here to avoid unnecessary | |
1435 | * dqget()/dqput() calls. | |
1436 | */ | |
5bcd3b6f | 1437 | if (dquots[cnt]) |
1ea06bec | 1438 | continue; |
847aac64 LX |
1439 | |
1440 | if (!sb_has_quota_active(sb, cnt)) | |
1441 | continue; | |
1442 | ||
1ea06bec NY |
1443 | init_needed = 1; |
1444 | ||
cc33412f JK |
1445 | switch (cnt) { |
1446 | case USRQUOTA: | |
aca645a6 | 1447 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1448 | break; |
1449 | case GRPQUOTA: | |
aca645a6 | 1450 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1451 | break; |
847aac64 LX |
1452 | case PRJQUOTA: |
1453 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1454 | if (rc) | |
1455 | continue; | |
1456 | qid = make_kqid_projid(projid); | |
1457 | break; | |
cc33412f | 1458 | } |
6184fc0b JK |
1459 | dquot = dqget(sb, qid); |
1460 | if (IS_ERR(dquot)) { | |
1461 | /* We raced with somebody turning quotas off... */ | |
1462 | if (PTR_ERR(dquot) != -ESRCH) { | |
1463 | ret = PTR_ERR(dquot); | |
1464 | goto out_put; | |
1465 | } | |
1466 | dquot = NULL; | |
1467 | } | |
1468 | got[cnt] = dquot; | |
cc33412f JK |
1469 | } |
1470 | ||
1ea06bec NY |
1471 | /* All required i_dquot has been initialized */ |
1472 | if (!init_needed) | |
6184fc0b | 1473 | return 0; |
1ea06bec | 1474 | |
b9ba6f94 | 1475 | spin_lock(&dq_data_lock); |
1da177e4 | 1476 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1477 | goto out_lock; |
1da177e4 LT |
1478 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1479 | if (type != -1 && cnt != type) | |
1480 | continue; | |
cc33412f JK |
1481 | /* Avoid races with quotaoff() */ |
1482 | if (!sb_has_quota_active(sb, cnt)) | |
1483 | continue; | |
4408ea41 JK |
1484 | /* We could race with quotaon or dqget() could have failed */ |
1485 | if (!got[cnt]) | |
1486 | continue; | |
5bcd3b6f KK |
1487 | if (!dquots[cnt]) { |
1488 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1489 | got[cnt] = NULL; |
0a5a9c72 JK |
1490 | /* |
1491 | * Make quota reservation system happy if someone | |
1492 | * did a write before quota was turned on | |
1493 | */ | |
1494 | rsv = inode_get_rsv_space(inode); | |
b9ba6f94 | 1495 | if (unlikely(rsv)) |
5bcd3b6f | 1496 | dquot_resv_space(dquots[cnt], rsv); |
1da177e4 LT |
1497 | } |
1498 | } | |
6184fc0b | 1499 | out_lock: |
b9ba6f94 | 1500 | spin_unlock(&dq_data_lock); |
6184fc0b | 1501 | out_put: |
cc33412f | 1502 | /* Drop unused references */ |
dc52dd3a | 1503 | dqput_all(got); |
6184fc0b JK |
1504 | |
1505 | return ret; | |
871a2931 CH |
1506 | } |
1507 | ||
6184fc0b | 1508 | int dquot_initialize(struct inode *inode) |
871a2931 | 1509 | { |
6184fc0b | 1510 | return __dquot_initialize(inode, -1); |
1da177e4 | 1511 | } |
08d0350c | 1512 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 LT |
1513 | |
1514 | /* | |
b9ba6f94 NY |
1515 | * Release all quotas referenced by inode. |
1516 | * | |
1517 | * This function only be called on inode free or converting | |
1518 | * a file to quota file, no other users for the i_dquot in | |
1519 | * both cases, so we needn't call synchronize_srcu() after | |
1520 | * clearing i_dquot. | |
1da177e4 | 1521 | */ |
9f754758 | 1522 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1523 | { |
1524 | int cnt; | |
5bcd3b6f | 1525 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1526 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1527 | |
b9ba6f94 | 1528 | spin_lock(&dq_data_lock); |
1da177e4 | 1529 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1530 | put[cnt] = dquots[cnt]; |
1531 | dquots[cnt] = NULL; | |
1da177e4 | 1532 | } |
b9ba6f94 | 1533 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1534 | dqput_all(put); |
1da177e4 LT |
1535 | } |
1536 | ||
9f754758 CH |
1537 | void dquot_drop(struct inode *inode) |
1538 | { | |
5bcd3b6f | 1539 | struct dquot * const *dquots; |
9f754758 CH |
1540 | int cnt; |
1541 | ||
1542 | if (IS_NOQUOTA(inode)) | |
1543 | return; | |
1544 | ||
1545 | /* | |
1546 | * Test before calling to rule out calls from proc and such | |
1547 | * where we are not allowed to block. Note that this is | |
1548 | * actually reliable test even without the lock - the caller | |
1549 | * must assure that nobody can come after the DQUOT_DROP and | |
1550 | * add quota pointers back anyway. | |
1551 | */ | |
5bcd3b6f | 1552 | dquots = i_dquot(inode); |
9f754758 | 1553 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1554 | if (dquots[cnt]) |
9f754758 CH |
1555 | break; |
1556 | } | |
1557 | ||
1558 | if (cnt < MAXQUOTAS) | |
1559 | __dquot_drop(inode); | |
1560 | } | |
1561 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1562 | |
fd8fbfc1 DM |
1563 | /* |
1564 | * inode_reserved_space is managed internally by quota, and protected by | |
1565 | * i_lock similar to i_blocks+i_bytes. | |
1566 | */ | |
1567 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1568 | { | |
1569 | /* Filesystem must explicitly define it's own method in order to use | |
1570 | * quota reservation interface */ | |
1571 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1572 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1573 | } | |
1574 | ||
c469070a | 1575 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1576 | { |
1577 | spin_lock(&inode->i_lock); | |
1578 | *inode_reserved_space(inode) += number; | |
1579 | spin_unlock(&inode->i_lock); | |
1580 | } | |
c469070a | 1581 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1582 | |
c469070a | 1583 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1584 | { |
1585 | spin_lock(&inode->i_lock); | |
1586 | *inode_reserved_space(inode) -= number; | |
1587 | __inode_add_bytes(inode, number); | |
1588 | spin_unlock(&inode->i_lock); | |
1589 | } | |
c469070a | 1590 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1591 | |
1c8924eb JK |
1592 | void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) |
1593 | { | |
1594 | spin_lock(&inode->i_lock); | |
1595 | *inode_reserved_space(inode) += number; | |
1596 | __inode_sub_bytes(inode, number); | |
1597 | spin_unlock(&inode->i_lock); | |
1598 | } | |
1599 | EXPORT_SYMBOL(inode_reclaim_rsv_space); | |
1600 | ||
c469070a | 1601 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1602 | { |
1603 | spin_lock(&inode->i_lock); | |
1604 | *inode_reserved_space(inode) -= number; | |
1605 | spin_unlock(&inode->i_lock); | |
1606 | } | |
c469070a | 1607 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1608 | |
1609 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1610 | { | |
1611 | qsize_t ret; | |
05b5d898 JK |
1612 | |
1613 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1614 | return 0; | |
fd8fbfc1 DM |
1615 | spin_lock(&inode->i_lock); |
1616 | ret = *inode_reserved_space(inode); | |
1617 | spin_unlock(&inode->i_lock); | |
1618 | return ret; | |
1619 | } | |
1620 | ||
1621 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1622 | int reserve) | |
1623 | { | |
1624 | if (reserve) | |
1625 | inode_add_rsv_space(inode, number); | |
1626 | else | |
1627 | inode_add_bytes(inode, number); | |
1628 | } | |
1629 | ||
1630 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1631 | { | |
1632 | if (reserve) | |
1633 | inode_sub_rsv_space(inode, number); | |
1634 | else | |
1635 | inode_sub_bytes(inode, number); | |
1636 | } | |
1637 | ||
1da177e4 | 1638 | /* |
5dd4056d CH |
1639 | * This functions updates i_blocks+i_bytes fields and quota information |
1640 | * (together with appropriate checks). | |
1641 | * | |
1642 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1643 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1644 | * the current transaction so that dquot write and inode write go into the | |
1645 | * same transaction. | |
1da177e4 LT |
1646 | */ |
1647 | ||
1648 | /* | |
1649 | * This operation can block, but only after everything is updated | |
1650 | */ | |
56246f9a | 1651 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1652 | { |
b9ba6f94 | 1653 | int cnt, ret = 0, index; |
bf097aaf | 1654 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1655 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1656 | struct dquot **dquots; |
1da177e4 | 1657 | |
189eef59 | 1658 | if (!dquot_active(inode)) { |
fd8fbfc1 DM |
1659 | inode_incr_space(inode, number, reserve); |
1660 | goto out; | |
1661 | } | |
1662 | ||
1da177e4 | 1663 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1664 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1665 | |
5bcd3b6f | 1666 | dquots = i_dquot(inode); |
b9ba6f94 | 1667 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1668 | spin_lock(&dq_data_lock); |
1669 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1670 | if (!dquots[cnt]) |
1da177e4 | 1671 | continue; |
bf097aaf JK |
1672 | ret = check_bdq(dquots[cnt], number, |
1673 | !(flags & DQUOT_SPACE_WARN), &warn[cnt]); | |
1674 | if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { | |
fd8fbfc1 DM |
1675 | spin_unlock(&dq_data_lock); |
1676 | goto out_flush_warn; | |
f18df228 | 1677 | } |
1da177e4 LT |
1678 | } |
1679 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1680 | if (!dquots[cnt]) |
1da177e4 | 1681 | continue; |
f18df228 | 1682 | if (reserve) |
bf097aaf | 1683 | dquot_resv_space(dquots[cnt], number); |
f18df228 | 1684 | else |
bf097aaf | 1685 | dquot_incr_space(dquots[cnt], number); |
1da177e4 | 1686 | } |
fd8fbfc1 | 1687 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1688 | spin_unlock(&dq_data_lock); |
f18df228 | 1689 | |
fd8fbfc1 DM |
1690 | if (reserve) |
1691 | goto out_flush_warn; | |
bf097aaf | 1692 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1693 | out_flush_warn: |
b9ba6f94 | 1694 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1695 | flush_warnings(warn); |
f18df228 MC |
1696 | out: |
1697 | return ret; | |
1698 | } | |
5dd4056d | 1699 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1700 | |
1701 | /* | |
1702 | * This operation can block, but only after everything is updated | |
1703 | */ | |
6bab3596 | 1704 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1705 | { |
b9ba6f94 | 1706 | int cnt, ret = 0, index; |
bf097aaf | 1707 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1708 | struct dquot * const *dquots; |
1da177e4 | 1709 | |
189eef59 | 1710 | if (!dquot_active(inode)) |
63936dda | 1711 | return 0; |
1da177e4 | 1712 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1713 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1714 | |
5bcd3b6f | 1715 | dquots = i_dquot(inode); |
b9ba6f94 | 1716 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1717 | spin_lock(&dq_data_lock); |
1718 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1719 | if (!dquots[cnt]) |
1da177e4 | 1720 | continue; |
bf097aaf | 1721 | ret = check_idq(dquots[cnt], 1, &warn[cnt]); |
efd8f0e6 | 1722 | if (ret) |
1da177e4 LT |
1723 | goto warn_put_all; |
1724 | } | |
1725 | ||
1726 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1727 | if (!dquots[cnt]) |
1da177e4 | 1728 | continue; |
bf097aaf | 1729 | dquot_incr_inodes(dquots[cnt], 1); |
1da177e4 | 1730 | } |
efd8f0e6 | 1731 | |
1da177e4 LT |
1732 | warn_put_all: |
1733 | spin_unlock(&dq_data_lock); | |
63936dda | 1734 | if (ret == 0) |
bf097aaf | 1735 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1736 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1737 | flush_warnings(warn); |
1da177e4 LT |
1738 | return ret; |
1739 | } | |
08d0350c | 1740 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1741 | |
5dd4056d CH |
1742 | /* |
1743 | * Convert in-memory reserved quotas to real consumed quotas | |
1744 | */ | |
1745 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1746 | { |
5bcd3b6f | 1747 | struct dquot **dquots; |
b9ba6f94 | 1748 | int cnt, index; |
740d9dcd | 1749 | |
189eef59 | 1750 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1751 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1752 | return 0; |
740d9dcd MC |
1753 | } |
1754 | ||
5bcd3b6f | 1755 | dquots = i_dquot(inode); |
b9ba6f94 | 1756 | index = srcu_read_lock(&dquot_srcu); |
740d9dcd MC |
1757 | spin_lock(&dq_data_lock); |
1758 | /* Claim reserved quotas to allocated quotas */ | |
1759 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
5bcd3b6f KK |
1760 | if (dquots[cnt]) |
1761 | dquot_claim_reserved_space(dquots[cnt], number); | |
740d9dcd MC |
1762 | } |
1763 | /* Update inode bytes */ | |
fd8fbfc1 | 1764 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1765 | spin_unlock(&dq_data_lock); |
5bcd3b6f | 1766 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1767 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1768 | return 0; |
740d9dcd | 1769 | } |
5dd4056d | 1770 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1771 | |
1c8924eb JK |
1772 | /* |
1773 | * Convert allocated space back to in-memory reserved quotas | |
1774 | */ | |
1775 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1776 | { | |
5bcd3b6f | 1777 | struct dquot **dquots; |
b9ba6f94 | 1778 | int cnt, index; |
1c8924eb JK |
1779 | |
1780 | if (!dquot_active(inode)) { | |
1781 | inode_reclaim_rsv_space(inode, number); | |
1782 | return; | |
1783 | } | |
1784 | ||
5bcd3b6f | 1785 | dquots = i_dquot(inode); |
b9ba6f94 | 1786 | index = srcu_read_lock(&dquot_srcu); |
1c8924eb JK |
1787 | spin_lock(&dq_data_lock); |
1788 | /* Claim reserved quotas to allocated quotas */ | |
1789 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
5bcd3b6f KK |
1790 | if (dquots[cnt]) |
1791 | dquot_reclaim_reserved_space(dquots[cnt], number); | |
1c8924eb JK |
1792 | } |
1793 | /* Update inode bytes */ | |
1794 | inode_reclaim_rsv_space(inode, number); | |
1795 | spin_unlock(&dq_data_lock); | |
5bcd3b6f | 1796 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1797 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1798 | return; |
1799 | } | |
1800 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1801 | ||
1da177e4 LT |
1802 | /* |
1803 | * This operation can block, but only after everything is updated | |
1804 | */ | |
56246f9a | 1805 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1806 | { |
1807 | unsigned int cnt; | |
bf097aaf | 1808 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1809 | struct dquot **dquots; |
b9ba6f94 | 1810 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1811 | |
189eef59 | 1812 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1813 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1814 | return; |
1da177e4 | 1815 | } |
657d3bfa | 1816 | |
5bcd3b6f | 1817 | dquots = i_dquot(inode); |
b9ba6f94 | 1818 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1819 | spin_lock(&dq_data_lock); |
1820 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1821 | int wtype; |
1822 | ||
1823 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1824 | if (!dquots[cnt]) | |
1da177e4 | 1825 | continue; |
bf097aaf JK |
1826 | wtype = info_bdq_free(dquots[cnt], number); |
1827 | if (wtype != QUOTA_NL_NOWARN) | |
1828 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1829 | if (reserve) |
bf097aaf | 1830 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1831 | else |
bf097aaf | 1832 | dquot_decr_space(dquots[cnt], number); |
1da177e4 | 1833 | } |
fd8fbfc1 | 1834 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1835 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1836 | |
1837 | if (reserve) | |
1838 | goto out_unlock; | |
bf097aaf | 1839 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1840 | out_unlock: |
b9ba6f94 | 1841 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1842 | flush_warnings(warn); |
fd8fbfc1 | 1843 | } |
5dd4056d | 1844 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1845 | |
1da177e4 LT |
1846 | /* |
1847 | * This operation can block, but only after everything is updated | |
1848 | */ | |
6bab3596 | 1849 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1850 | { |
1851 | unsigned int cnt; | |
bf097aaf | 1852 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1853 | struct dquot * const *dquots; |
b9ba6f94 | 1854 | int index; |
1da177e4 | 1855 | |
189eef59 | 1856 | if (!dquot_active(inode)) |
63936dda | 1857 | return; |
657d3bfa | 1858 | |
5bcd3b6f | 1859 | dquots = i_dquot(inode); |
b9ba6f94 | 1860 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1861 | spin_lock(&dq_data_lock); |
1862 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1863 | int wtype; |
1864 | ||
1865 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1866 | if (!dquots[cnt]) | |
1da177e4 | 1867 | continue; |
bf097aaf JK |
1868 | wtype = info_idq_free(dquots[cnt], 1); |
1869 | if (wtype != QUOTA_NL_NOWARN) | |
1870 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1871 | dquot_decr_inodes(dquots[cnt], 1); | |
1da177e4 LT |
1872 | } |
1873 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1874 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1875 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1876 | flush_warnings(warn); |
1da177e4 | 1877 | } |
08d0350c | 1878 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1879 | |
1880 | /* | |
1881 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1882 | * On success, dquot references in transfer_to are consumed and references |
1883 | * to original dquots that need to be released are placed there. On failure, | |
1884 | * references are kept untouched. | |
1da177e4 LT |
1885 | * |
1886 | * This operation can block, but only after everything is updated | |
1887 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1888 | * |
b9ba6f94 NY |
1889 | * We are holding reference on transfer_from & transfer_to, no need to |
1890 | * protect them by srcu_read_lock(). | |
1da177e4 | 1891 | */ |
bc8e5f07 | 1892 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1893 | { |
740d9dcd MC |
1894 | qsize_t space, cur_space; |
1895 | qsize_t rsv_space = 0; | |
bc8e5f07 | 1896 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1897 | int cnt, ret = 0; |
9e32784b | 1898 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1899 | struct dquot_warn warn_to[MAXQUOTAS]; |
1900 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1901 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1902 | |
1da177e4 | 1903 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1904 | return 0; |
cc33412f | 1905 | /* Initialize the arrays */ |
bf097aaf JK |
1906 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1907 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1908 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1909 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1910 | } | |
b9ba6f94 NY |
1911 | |
1912 | spin_lock(&dq_data_lock); | |
cc33412f | 1913 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
b9ba6f94 | 1914 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1915 | return 0; |
cc33412f | 1916 | } |
740d9dcd | 1917 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1918 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1919 | space = cur_space + rsv_space; |
1da177e4 LT |
1920 | /* Build the transfer_from list and check the limits */ |
1921 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b D |
1922 | /* |
1923 | * Skip changes for same uid or gid or for turned off quota-type. | |
1924 | */ | |
dd6f3c6d | 1925 | if (!transfer_to[cnt]) |
1da177e4 | 1926 | continue; |
9e32784b D |
1927 | /* Avoid races with quotaoff() */ |
1928 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1929 | continue; | |
1930 | is_valid[cnt] = 1; | |
2d0fa467 | 1931 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
bf097aaf | 1932 | ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); |
efd8f0e6 CH |
1933 | if (ret) |
1934 | goto over_quota; | |
bf097aaf | 1935 | ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); |
efd8f0e6 | 1936 | if (ret) |
cc33412f | 1937 | goto over_quota; |
1da177e4 LT |
1938 | } |
1939 | ||
1940 | /* | |
1941 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1942 | */ | |
1943 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b | 1944 | if (!is_valid[cnt]) |
1da177e4 | 1945 | continue; |
1da177e4 LT |
1946 | /* Due to IO error we might not have transfer_from[] structure */ |
1947 | if (transfer_from[cnt]) { | |
bf097aaf JK |
1948 | int wtype; |
1949 | wtype = info_idq_free(transfer_from[cnt], 1); | |
1950 | if (wtype != QUOTA_NL_NOWARN) | |
1951 | prepare_warning(&warn_from_inodes[cnt], | |
1952 | transfer_from[cnt], wtype); | |
1953 | wtype = info_bdq_free(transfer_from[cnt], space); | |
1954 | if (wtype != QUOTA_NL_NOWARN) | |
1955 | prepare_warning(&warn_from_space[cnt], | |
1956 | transfer_from[cnt], wtype); | |
1da177e4 | 1957 | dquot_decr_inodes(transfer_from[cnt], 1); |
740d9dcd MC |
1958 | dquot_decr_space(transfer_from[cnt], cur_space); |
1959 | dquot_free_reserved_space(transfer_from[cnt], | |
1960 | rsv_space); | |
1da177e4 LT |
1961 | } |
1962 | ||
1963 | dquot_incr_inodes(transfer_to[cnt], 1); | |
740d9dcd MC |
1964 | dquot_incr_space(transfer_to[cnt], cur_space); |
1965 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 | 1966 | |
2d0fa467 | 1967 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 1968 | } |
1da177e4 | 1969 | spin_unlock(&dq_data_lock); |
cc33412f | 1970 | |
dc52dd3a DM |
1971 | mark_all_dquot_dirty(transfer_from); |
1972 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
1973 | flush_warnings(warn_to); |
1974 | flush_warnings(warn_from_inodes); | |
1975 | flush_warnings(warn_from_space); | |
bc8e5f07 | 1976 | /* Pass back references to put */ |
dc52dd3a | 1977 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
1978 | if (is_valid[cnt]) |
1979 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 1980 | return 0; |
cc33412f JK |
1981 | over_quota: |
1982 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1983 | flush_warnings(warn_to); |
86f3cbec | 1984 | return ret; |
1da177e4 | 1985 | } |
bc8e5f07 | 1986 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 1987 | |
8ddd69d6 DM |
1988 | /* Wrapper for transferring ownership of an inode for uid/gid only |
1989 | * Called from FSXXX_setattr() | |
1990 | */ | |
b43fa828 | 1991 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 1992 | { |
bc8e5f07 | 1993 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 1994 | struct dquot *dquot; |
bc8e5f07 JK |
1995 | struct super_block *sb = inode->i_sb; |
1996 | int ret; | |
8ddd69d6 | 1997 | |
189eef59 | 1998 | if (!dquot_active(inode)) |
bc8e5f07 | 1999 | return 0; |
12755627 | 2000 | |
6184fc0b JK |
2001 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2002 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2003 | if (IS_ERR(dquot)) { | |
2004 | if (PTR_ERR(dquot) != -ESRCH) { | |
2005 | ret = PTR_ERR(dquot); | |
2006 | goto out_put; | |
2007 | } | |
2008 | dquot = NULL; | |
2009 | } | |
2010 | transfer_to[USRQUOTA] = dquot; | |
2011 | } | |
2012 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2013 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2014 | if (IS_ERR(dquot)) { | |
2015 | if (PTR_ERR(dquot) != -ESRCH) { | |
2016 | ret = PTR_ERR(dquot); | |
2017 | goto out_put; | |
2018 | } | |
2019 | dquot = NULL; | |
2020 | } | |
2021 | transfer_to[GRPQUOTA] = dquot; | |
2022 | } | |
bc8e5f07 | 2023 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2024 | out_put: |
bc8e5f07 JK |
2025 | dqput_all(transfer_to); |
2026 | return ret; | |
b85f4b87 | 2027 | } |
b43fa828 | 2028 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2029 | |
1da177e4 LT |
2030 | /* |
2031 | * Write info of quota file to disk | |
2032 | */ | |
2033 | int dquot_commit_info(struct super_block *sb, int type) | |
2034 | { | |
2035 | int ret; | |
2036 | struct quota_info *dqopt = sb_dqopt(sb); | |
2037 | ||
d3be915f | 2038 | mutex_lock(&dqopt->dqio_mutex); |
1da177e4 | 2039 | ret = dqopt->ops[type]->write_file_info(sb, type); |
d3be915f | 2040 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2041 | return ret; |
2042 | } | |
08d0350c | 2043 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2044 | |
be6257b2 JK |
2045 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2046 | { | |
2047 | struct quota_info *dqopt = sb_dqopt(sb); | |
2048 | int err; | |
2049 | ||
17e8a893 JK |
2050 | mutex_lock(&dqopt->dqonoff_mutex); |
2051 | if (!sb_has_quota_active(sb, qid->type)) { | |
2052 | err = -ESRCH; | |
2053 | goto out; | |
2054 | } | |
2055 | if (!dqopt->ops[qid->type]->get_next_id) { | |
2056 | err = -ENOSYS; | |
2057 | goto out; | |
2058 | } | |
be6257b2 JK |
2059 | mutex_lock(&dqopt->dqio_mutex); |
2060 | err = dqopt->ops[qid->type]->get_next_id(sb, qid); | |
2061 | mutex_unlock(&dqopt->dqio_mutex); | |
17e8a893 JK |
2062 | out: |
2063 | mutex_unlock(&dqopt->dqonoff_mutex); | |
be6257b2 JK |
2064 | |
2065 | return err; | |
2066 | } | |
2067 | EXPORT_SYMBOL(dquot_get_next_id); | |
2068 | ||
1da177e4 LT |
2069 | /* |
2070 | * Definitions of diskquota operations. | |
2071 | */ | |
61e225dc | 2072 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2073 | .write_dquot = dquot_commit, |
2074 | .acquire_dquot = dquot_acquire, | |
2075 | .release_dquot = dquot_release, | |
2076 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2077 | .write_info = dquot_commit_info, |
2078 | .alloc_dquot = dquot_alloc, | |
2079 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2080 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2081 | }; |
123e9caf | 2082 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2083 | |
907f4554 CH |
2084 | /* |
2085 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2086 | */ | |
2087 | int dquot_file_open(struct inode *inode, struct file *file) | |
2088 | { | |
2089 | int error; | |
2090 | ||
2091 | error = generic_file_open(inode, file); | |
2092 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 2093 | dquot_initialize(inode); |
907f4554 CH |
2094 | return error; |
2095 | } | |
2096 | EXPORT_SYMBOL(dquot_file_open); | |
2097 | ||
1da177e4 LT |
2098 | /* |
2099 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2100 | */ | |
0f0dd62f | 2101 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2102 | { |
0ff5af83 | 2103 | int cnt, ret = 0; |
1da177e4 LT |
2104 | struct quota_info *dqopt = sb_dqopt(sb); |
2105 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2106 | |
f55abc0f JK |
2107 | /* Cannot turn off usage accounting without turning off limits, or |
2108 | * suspend quotas and simultaneously turn quotas off. */ | |
2109 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2110 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2111 | DQUOT_USAGE_ENABLED))) | |
2112 | return -EINVAL; | |
2113 | ||
1da177e4 | 2114 | /* We need to serialize quota_off() for device */ |
d3be915f | 2115 | mutex_lock(&dqopt->dqonoff_mutex); |
9377abd0 JK |
2116 | |
2117 | /* | |
2118 | * Skip everything if there's nothing to do. We have to do this because | |
2119 | * sometimes we are called when fill_super() failed and calling | |
2120 | * sync_fs() in such cases does no good. | |
2121 | */ | |
f55abc0f | 2122 | if (!sb_any_quota_loaded(sb)) { |
9377abd0 JK |
2123 | mutex_unlock(&dqopt->dqonoff_mutex); |
2124 | return 0; | |
2125 | } | |
1da177e4 LT |
2126 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2127 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2128 | if (type != -1 && cnt != type) |
2129 | continue; | |
f55abc0f | 2130 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2131 | continue; |
f55abc0f JK |
2132 | |
2133 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2134 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2135 | dqopt->flags |= |
2136 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2137 | spin_unlock(&dq_state_lock); |
f55abc0f | 2138 | } else { |
cc33412f | 2139 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2140 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2141 | /* Turning off suspended quotas? */ | |
2142 | if (!sb_has_quota_loaded(sb, cnt) && | |
2143 | sb_has_quota_suspended(sb, cnt)) { | |
2144 | dqopt->flags &= ~dquot_state_flag( | |
2145 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2146 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2147 | iput(dqopt->files[cnt]); |
2148 | dqopt->files[cnt] = NULL; | |
2149 | continue; | |
2150 | } | |
cc33412f | 2151 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2152 | } |
f55abc0f JK |
2153 | |
2154 | /* We still have to keep quota loaded? */ | |
2155 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2156 | continue; |
1da177e4 LT |
2157 | |
2158 | /* Note: these are blocking operations */ | |
2159 | drop_dquot_ref(sb, cnt); | |
2160 | invalidate_dquots(sb, cnt); | |
2161 | /* | |
268157ba JK |
2162 | * Now all dquots should be invalidated, all writes done so we |
2163 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2164 | */ |
2165 | if (info_dirty(&dqopt->info[cnt])) | |
2166 | sb->dq_op->write_info(sb, cnt); | |
2167 | if (dqopt->ops[cnt]->free_file_info) | |
2168 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2169 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2170 | ||
2171 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2172 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2173 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2174 | dqopt->info[cnt].dqi_flags = 0; |
2175 | dqopt->info[cnt].dqi_igrace = 0; | |
2176 | dqopt->info[cnt].dqi_bgrace = 0; | |
2177 | dqopt->ops[cnt] = NULL; | |
2178 | } | |
d3be915f | 2179 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2180 | |
2181 | /* Skip syncing and setting flags if quota files are hidden */ | |
2182 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2183 | goto put_inodes; | |
2184 | ||
1da177e4 | 2185 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2186 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2187 | if (sb->s_op->sync_fs) |
2188 | sb->s_op->sync_fs(sb, 1); | |
2189 | sync_blockdev(sb->s_bdev); | |
2190 | /* Now the quota files are just ordinary files and we can set the | |
2191 | * inode flags back. Moreover we discard the pagecache so that | |
2192 | * userspace sees the writes we did bypassing the pagecache. We | |
2193 | * must also discard the blockdev buffers so that we see the | |
2194 | * changes done by userspace on the next quotaon() */ | |
2195 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2196 | if (toputinode[cnt]) { | |
d3be915f | 2197 | mutex_lock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2198 | /* If quota was reenabled in the meantime, we have |
2199 | * nothing to do */ | |
f55abc0f | 2200 | if (!sb_has_quota_loaded(sb, cnt)) { |
5955102c | 2201 | inode_lock(toputinode[cnt]); |
1da177e4 LT |
2202 | toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | |
2203 | S_NOATIME | S_NOQUOTA); | |
268157ba JK |
2204 | truncate_inode_pages(&toputinode[cnt]->i_data, |
2205 | 0); | |
5955102c | 2206 | inode_unlock(toputinode[cnt]); |
43d2932d | 2207 | mark_inode_dirty_sync(toputinode[cnt]); |
1da177e4 | 2208 | } |
d3be915f | 2209 | mutex_unlock(&dqopt->dqonoff_mutex); |
ca785ec6 JK |
2210 | } |
2211 | if (sb->s_bdev) | |
2212 | invalidate_bdev(sb->s_bdev); | |
2213 | put_inodes: | |
2214 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2215 | if (toputinode[cnt]) { | |
0ff5af83 | 2216 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2217 | * can reenable quota on the subsequent remount RW. We |
2218 | * have to check 'flags' variable and not use sb_has_ | |
2219 | * function because another quotaon / quotaoff could | |
2220 | * change global state before we got here. We refuse | |
2221 | * to suspend quotas when there is pending delete on | |
2222 | * the quota file... */ | |
2223 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2224 | iput(toputinode[cnt]); |
2225 | else if (!toputinode[cnt]->i_nlink) | |
2226 | ret = -EBUSY; | |
1da177e4 | 2227 | } |
0ff5af83 | 2228 | return ret; |
1da177e4 | 2229 | } |
0f0dd62f | 2230 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2231 | |
287a8095 | 2232 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2233 | { |
0f0dd62f CH |
2234 | return dquot_disable(sb, type, |
2235 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2236 | } |
287a8095 | 2237 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2238 | |
1da177e4 LT |
2239 | /* |
2240 | * Turn quotas on on a device | |
2241 | */ | |
2242 | ||
f55abc0f JK |
2243 | /* |
2244 | * Helper function to turn quotas on when we already have the inode of | |
2245 | * quota file and no quota information is loaded. | |
2246 | */ | |
2247 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2248 | unsigned int flags) | |
1da177e4 LT |
2249 | { |
2250 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2251 | struct super_block *sb = inode->i_sb; | |
2252 | struct quota_info *dqopt = sb_dqopt(sb); | |
2253 | int error; | |
2254 | int oldflags = -1; | |
2255 | ||
2256 | if (!fmt) | |
2257 | return -ESRCH; | |
2258 | if (!S_ISREG(inode->i_mode)) { | |
2259 | error = -EACCES; | |
2260 | goto out_fmt; | |
2261 | } | |
2262 | if (IS_RDONLY(inode)) { | |
2263 | error = -EROFS; | |
2264 | goto out_fmt; | |
2265 | } | |
847aac64 LX |
2266 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2267 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2268 | error = -EINVAL; |
2269 | goto out_fmt; | |
2270 | } | |
f55abc0f JK |
2271 | /* Usage always has to be set... */ |
2272 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2273 | error = -EINVAL; | |
2274 | goto out_fmt; | |
2275 | } | |
1da177e4 | 2276 | |
ca785ec6 | 2277 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2278 | /* As we bypass the pagecache we must now flush all the |
2279 | * dirty data and invalidate caches so that kernel sees | |
2280 | * changes from userspace. It is not enough to just flush | |
2281 | * the quota file since if blocksize < pagesize, invalidation | |
2282 | * of the cache could fail because of other unrelated dirty | |
2283 | * data */ | |
2284 | sync_filesystem(sb); | |
ca785ec6 JK |
2285 | invalidate_bdev(sb->s_bdev); |
2286 | } | |
d3be915f | 2287 | mutex_lock(&dqopt->dqonoff_mutex); |
f55abc0f | 2288 | if (sb_has_quota_loaded(sb, type)) { |
1da177e4 LT |
2289 | error = -EBUSY; |
2290 | goto out_lock; | |
2291 | } | |
ca785ec6 JK |
2292 | |
2293 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2294 | /* We don't want quota and atime on quota files (deadlocks | |
2295 | * possible) Also nobody should write to the file - we use | |
2296 | * special IO operations which ignore the immutable bit. */ | |
5955102c | 2297 | inode_lock(inode); |
268157ba JK |
2298 | oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | |
2299 | S_NOQUOTA); | |
ca785ec6 | 2300 | inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; |
5955102c | 2301 | inode_unlock(inode); |
26245c94 JK |
2302 | /* |
2303 | * When S_NOQUOTA is set, remove dquot references as no more | |
2304 | * references can be added | |
2305 | */ | |
9f754758 | 2306 | __dquot_drop(inode); |
ca785ec6 | 2307 | } |
1da177e4 LT |
2308 | |
2309 | error = -EIO; | |
2310 | dqopt->files[type] = igrab(inode); | |
2311 | if (!dqopt->files[type]) | |
2312 | goto out_lock; | |
2313 | error = -EINVAL; | |
2314 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2315 | goto out_file_init; | |
2316 | ||
2317 | dqopt->ops[type] = fmt->qf_ops; | |
2318 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2319 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2320 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d3be915f | 2321 | mutex_lock(&dqopt->dqio_mutex); |
268157ba JK |
2322 | error = dqopt->ops[type]->read_file_info(sb, type); |
2323 | if (error < 0) { | |
d3be915f | 2324 | mutex_unlock(&dqopt->dqio_mutex); |
1da177e4 LT |
2325 | goto out_file_init; |
2326 | } | |
46fe44ce JK |
2327 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) |
2328 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; | |
d3be915f | 2329 | mutex_unlock(&dqopt->dqio_mutex); |
cc33412f | 2330 | spin_lock(&dq_state_lock); |
f55abc0f | 2331 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2332 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2333 | |
2334 | add_dquot_ref(sb, type); | |
d3be915f | 2335 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2336 | |
2337 | return 0; | |
2338 | ||
2339 | out_file_init: | |
2340 | dqopt->files[type] = NULL; | |
2341 | iput(inode); | |
2342 | out_lock: | |
1da177e4 | 2343 | if (oldflags != -1) { |
5955102c | 2344 | inode_lock(inode); |
1da177e4 LT |
2345 | /* Set the flags back (in the case of accidental quotaon() |
2346 | * on a wrong file we don't want to mess up the flags) */ | |
2347 | inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); | |
2348 | inode->i_flags |= oldflags; | |
5955102c | 2349 | inode_unlock(inode); |
1da177e4 | 2350 | } |
d01730d7 | 2351 | mutex_unlock(&dqopt->dqonoff_mutex); |
1da177e4 LT |
2352 | out_fmt: |
2353 | put_quota_format(fmt); | |
2354 | ||
2355 | return error; | |
2356 | } | |
2357 | ||
0ff5af83 | 2358 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2359 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2360 | { |
2361 | struct quota_info *dqopt = sb_dqopt(sb); | |
2362 | struct inode *inode; | |
0f0dd62f | 2363 | int ret = 0, cnt; |
f55abc0f | 2364 | unsigned int flags; |
0ff5af83 | 2365 | |
0f0dd62f CH |
2366 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2367 | if (type != -1 && cnt != type) | |
2368 | continue; | |
2369 | ||
2370 | mutex_lock(&dqopt->dqonoff_mutex); | |
2371 | if (!sb_has_quota_suspended(sb, cnt)) { | |
2372 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2373 | continue; | |
2374 | } | |
2375 | inode = dqopt->files[cnt]; | |
2376 | dqopt->files[cnt] = NULL; | |
2377 | spin_lock(&dq_state_lock); | |
2378 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2379 | DQUOT_LIMITS_ENABLED, | |
2380 | cnt); | |
2381 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2382 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2383 | mutex_unlock(&dqopt->dqonoff_mutex); |
0ff5af83 | 2384 | |
0f0dd62f CH |
2385 | flags = dquot_generic_flag(flags, cnt); |
2386 | ret = vfs_load_quota_inode(inode, cnt, | |
2387 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2388 | iput(inode); | |
2389 | } | |
0ff5af83 JK |
2390 | |
2391 | return ret; | |
2392 | } | |
0f0dd62f | 2393 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2394 | |
f00c9e44 JK |
2395 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
2396 | struct path *path) | |
77e69dac AV |
2397 | { |
2398 | int error = security_quota_on(path->dentry); | |
2399 | if (error) | |
2400 | return error; | |
2401 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2402 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2403 | error = -EXDEV; |
2404 | else | |
dea655c2 | 2405 | error = vfs_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2406 | format_id, DQUOT_USAGE_ENABLED | |
2407 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2408 | return error; |
2409 | } | |
287a8095 | 2410 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2411 | |
f55abc0f JK |
2412 | /* |
2413 | * More powerful function for turning on quotas allowing setting | |
2414 | * of individual quota flags | |
2415 | */ | |
287a8095 CH |
2416 | int dquot_enable(struct inode *inode, int type, int format_id, |
2417 | unsigned int flags) | |
f55abc0f JK |
2418 | { |
2419 | int ret = 0; | |
2420 | struct super_block *sb = inode->i_sb; | |
2421 | struct quota_info *dqopt = sb_dqopt(sb); | |
2422 | ||
2423 | /* Just unsuspend quotas? */ | |
0f0dd62f CH |
2424 | BUG_ON(flags & DQUOT_SUSPENDED); |
2425 | ||
f55abc0f JK |
2426 | if (!flags) |
2427 | return 0; | |
2428 | /* Just updating flags needed? */ | |
2429 | if (sb_has_quota_loaded(sb, type)) { | |
2430 | mutex_lock(&dqopt->dqonoff_mutex); | |
2431 | /* Now do a reliable test... */ | |
2432 | if (!sb_has_quota_loaded(sb, type)) { | |
2433 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2434 | goto load_quota; | |
2435 | } | |
2436 | if (flags & DQUOT_USAGE_ENABLED && | |
2437 | sb_has_quota_usage_enabled(sb, type)) { | |
2438 | ret = -EBUSY; | |
2439 | goto out_lock; | |
2440 | } | |
2441 | if (flags & DQUOT_LIMITS_ENABLED && | |
2442 | sb_has_quota_limits_enabled(sb, type)) { | |
2443 | ret = -EBUSY; | |
2444 | goto out_lock; | |
2445 | } | |
cc33412f | 2446 | spin_lock(&dq_state_lock); |
f55abc0f | 2447 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2448 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2449 | out_lock: |
2450 | mutex_unlock(&dqopt->dqonoff_mutex); | |
2451 | return ret; | |
2452 | } | |
2453 | ||
2454 | load_quota: | |
2455 | return vfs_load_quota_inode(inode, type, format_id, flags); | |
2456 | } | |
287a8095 | 2457 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2458 | |
1da177e4 LT |
2459 | /* |
2460 | * This function is used when filesystem needs to initialize quotas | |
2461 | * during mount time. | |
2462 | */ | |
287a8095 | 2463 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2464 | int format_id, int type) |
1da177e4 | 2465 | { |
84de856e | 2466 | struct dentry *dentry; |
1da177e4 LT |
2467 | int error; |
2468 | ||
e12a4e8a | 2469 | dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2470 | if (IS_ERR(dentry)) |
2471 | return PTR_ERR(dentry); | |
2472 | ||
dea655c2 | 2473 | if (d_really_is_negative(dentry)) { |
154f484b JK |
2474 | error = -ENOENT; |
2475 | goto out; | |
2476 | } | |
2477 | ||
1da177e4 | 2478 | error = security_quota_on(dentry); |
84de856e | 2479 | if (!error) |
dea655c2 | 2480 | error = vfs_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2481 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2482 | |
154f484b | 2483 | out: |
84de856e CH |
2484 | dput(dentry); |
2485 | return error; | |
1da177e4 | 2486 | } |
287a8095 | 2487 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2488 | |
3e2af67e JK |
2489 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2490 | { | |
2491 | int ret; | |
2492 | int type; | |
2493 | struct quota_info *dqopt = sb_dqopt(sb); | |
2494 | ||
2495 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2496 | return -ENOSYS; | |
2497 | /* Accounting cannot be turned on while fs is mounted */ | |
2498 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2499 | if (!flags) | |
2500 | return -EINVAL; | |
2501 | for (type = 0; type < MAXQUOTAS; type++) { | |
2502 | if (!(flags & qtype_enforce_flag(type))) | |
2503 | continue; | |
2504 | /* Can't enforce without accounting */ | |
2505 | if (!sb_has_quota_usage_enabled(sb, type)) | |
2506 | return -EINVAL; | |
2507 | ret = dquot_enable(dqopt->files[type], type, | |
2508 | dqopt->info[type].dqi_fmt_id, | |
2509 | DQUOT_LIMITS_ENABLED); | |
2510 | if (ret < 0) | |
2511 | goto out_err; | |
2512 | } | |
2513 | return 0; | |
2514 | out_err: | |
2515 | /* Backout enforcement enablement we already did */ | |
2516 | for (type--; type >= 0; type--) { | |
2517 | if (flags & qtype_enforce_flag(type)) | |
2518 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2519 | } | |
2520 | /* Error code translation for better compatibility with XFS */ | |
2521 | if (ret == -EBUSY) | |
2522 | ret = -EEXIST; | |
2523 | return ret; | |
2524 | } | |
2525 | ||
2526 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2527 | { | |
2528 | int ret; | |
2529 | int type; | |
2530 | struct quota_info *dqopt = sb_dqopt(sb); | |
2531 | ||
2532 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2533 | return -ENOSYS; | |
2534 | /* | |
2535 | * We don't support turning off accounting via quotactl. In principle | |
2536 | * quota infrastructure can do this but filesystems don't expect | |
2537 | * userspace to be able to do it. | |
2538 | */ | |
2539 | if (flags & | |
2540 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2541 | return -EOPNOTSUPP; | |
2542 | ||
2543 | /* Filter out limits not enabled */ | |
2544 | for (type = 0; type < MAXQUOTAS; type++) | |
2545 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2546 | flags &= ~qtype_enforce_flag(type); | |
2547 | /* Nothing left? */ | |
2548 | if (!flags) | |
2549 | return -EEXIST; | |
2550 | for (type = 0; type < MAXQUOTAS; type++) { | |
2551 | if (flags & qtype_enforce_flag(type)) { | |
2552 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2553 | if (ret < 0) | |
2554 | goto out_err; | |
2555 | } | |
2556 | } | |
2557 | return 0; | |
2558 | out_err: | |
2559 | /* Backout enforcement disabling we already did */ | |
2560 | for (type--; type >= 0; type--) { | |
2561 | if (flags & qtype_enforce_flag(type)) | |
2562 | dquot_enable(dqopt->files[type], type, | |
2563 | dqopt->info[type].dqi_fmt_id, | |
2564 | DQUOT_LIMITS_ENABLED); | |
2565 | } | |
2566 | return ret; | |
2567 | } | |
2568 | ||
1da177e4 | 2569 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2570 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2571 | { |
2572 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2573 | ||
b9b2dd36 | 2574 | memset(di, 0, sizeof(*di)); |
1da177e4 | 2575 | spin_lock(&dq_data_lock); |
14bf61ff JK |
2576 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2577 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2578 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2579 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2580 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2581 | di->d_ino_count = dm->dqb_curinodes; | |
2582 | di->d_spc_timer = dm->dqb_btime; | |
2583 | di->d_ino_timer = dm->dqb_itime; | |
1da177e4 LT |
2584 | spin_unlock(&dq_data_lock); |
2585 | } | |
2586 | ||
74a8a103 | 2587 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2588 | struct qc_dqblk *di) |
1da177e4 LT |
2589 | { |
2590 | struct dquot *dquot; | |
2591 | ||
aca645a6 | 2592 | dquot = dqget(sb, qid); |
6184fc0b JK |
2593 | if (IS_ERR(dquot)) |
2594 | return PTR_ERR(dquot); | |
1da177e4 LT |
2595 | do_get_dqblk(dquot, di); |
2596 | dqput(dquot); | |
cc33412f | 2597 | |
1da177e4 LT |
2598 | return 0; |
2599 | } | |
287a8095 | 2600 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2601 | |
be6257b2 JK |
2602 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2603 | struct qc_dqblk *di) | |
2604 | { | |
2605 | struct dquot *dquot; | |
2606 | int err; | |
2607 | ||
2608 | if (!sb->dq_op->get_next_id) | |
2609 | return -ENOSYS; | |
2610 | err = sb->dq_op->get_next_id(sb, qid); | |
2611 | if (err < 0) | |
2612 | return err; | |
2613 | dquot = dqget(sb, *qid); | |
2614 | if (IS_ERR(dquot)) | |
2615 | return PTR_ERR(dquot); | |
2616 | do_get_dqblk(dquot, di); | |
2617 | dqput(dquot); | |
2618 | ||
2619 | return 0; | |
2620 | } | |
2621 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2622 | ||
14bf61ff JK |
2623 | #define VFS_QC_MASK \ |
2624 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2625 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2626 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2627 | |
1da177e4 | 2628 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2629 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2630 | { |
2631 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2632 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2633 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2634 | |
14bf61ff | 2635 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2636 | return -EINVAL; |
2637 | ||
14bf61ff | 2638 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2639 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2640 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2641 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2642 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2643 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2644 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2645 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2646 | return -ERANGE; |
1da177e4 LT |
2647 | |
2648 | spin_lock(&dq_data_lock); | |
14bf61ff JK |
2649 | if (di->d_fieldmask & QC_SPACE) { |
2650 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2651 | check_blim = 1; |
08261673 | 2652 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2653 | } |
c472b432 | 2654 | |
14bf61ff JK |
2655 | if (di->d_fieldmask & QC_SPC_SOFT) |
2656 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2657 | if (di->d_fieldmask & QC_SPC_HARD) | |
2658 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2659 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2660 | check_blim = 1; |
08261673 | 2661 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2662 | } |
c472b432 | 2663 | |
14bf61ff JK |
2664 | if (di->d_fieldmask & QC_INO_COUNT) { |
2665 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2666 | check_ilim = 1; |
08261673 | 2667 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2668 | } |
c472b432 | 2669 | |
14bf61ff | 2670 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2671 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2672 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2673 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2674 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2675 | check_ilim = 1; |
08261673 | 2676 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2677 | } |
c472b432 | 2678 | |
14bf61ff JK |
2679 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2680 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2681 | check_blim = 1; |
08261673 | 2682 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2683 | } |
c472b432 | 2684 | |
14bf61ff JK |
2685 | if (di->d_fieldmask & QC_INO_TIMER) { |
2686 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2687 | check_ilim = 1; |
08261673 | 2688 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2689 | } |
1da177e4 LT |
2690 | |
2691 | if (check_blim) { | |
268157ba JK |
2692 | if (!dm->dqb_bsoftlimit || |
2693 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2694 | dm->dqb_btime = 0; |
2695 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2696 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2697 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2698 | dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2699 | } |
2700 | if (check_ilim) { | |
268157ba JK |
2701 | if (!dm->dqb_isoftlimit || |
2702 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2703 | dm->dqb_itime = 0; |
2704 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2705 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2706 | /* Set grace only if user hasn't provided his own... */ |
338bf9af | 2707 | dm->dqb_itime = get_seconds() + dqi->dqi_igrace; |
1da177e4 | 2708 | } |
268157ba JK |
2709 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2710 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2711 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2712 | else | |
2713 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2714 | spin_unlock(&dq_data_lock); | |
2715 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2716 | |
2717 | return 0; | |
1da177e4 LT |
2718 | } |
2719 | ||
74a8a103 | 2720 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2721 | struct qc_dqblk *di) |
1da177e4 LT |
2722 | { |
2723 | struct dquot *dquot; | |
338bf9af | 2724 | int rc; |
1da177e4 | 2725 | |
aca645a6 | 2726 | dquot = dqget(sb, qid); |
6184fc0b JK |
2727 | if (IS_ERR(dquot)) { |
2728 | rc = PTR_ERR(dquot); | |
f55abc0f | 2729 | goto out; |
1da177e4 | 2730 | } |
338bf9af | 2731 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2732 | dqput(dquot); |
f55abc0f | 2733 | out: |
338bf9af | 2734 | return rc; |
1da177e4 | 2735 | } |
287a8095 | 2736 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2737 | |
2738 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2739 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2740 | { |
2741 | struct mem_dqinfo *mi; | |
0a240339 JK |
2742 | struct qc_type_state *tstate; |
2743 | struct quota_info *dqopt = sb_dqopt(sb); | |
2744 | int type; | |
1da177e4 | 2745 | |
d3be915f | 2746 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
0a240339 JK |
2747 | memset(state, 0, sizeof(*state)); |
2748 | for (type = 0; type < MAXQUOTAS; type++) { | |
2749 | if (!sb_has_quota_active(sb, type)) | |
2750 | continue; | |
2751 | tstate = state->s_state + type; | |
2752 | mi = sb_dqopt(sb)->info + type; | |
2753 | tstate->flags = QCI_ACCT_ENABLED; | |
2754 | spin_lock(&dq_data_lock); | |
2755 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2756 | tstate->flags |= QCI_SYSFILE; | |
2757 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2758 | tstate->flags |= QCI_ROOT_SQUASH; | |
2759 | if (sb_has_quota_limits_enabled(sb, type)) | |
2760 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2761 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2762 | tstate->ino_timelimit = mi->dqi_igrace; | |
2763 | tstate->ino = dqopt->files[type]->i_ino; | |
2764 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2765 | tstate->nextents = 1; /* We don't know... */ | |
2766 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2767 | } |
d3be915f | 2768 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 LT |
2769 | return 0; |
2770 | } | |
0a240339 | 2771 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2772 | |
2773 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2774 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2775 | { |
2776 | struct mem_dqinfo *mi; | |
f55abc0f | 2777 | int err = 0; |
1da177e4 | 2778 | |
5eacb2ac JK |
2779 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2780 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2781 | return -EINVAL; | |
d3be915f | 2782 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f JK |
2783 | if (!sb_has_quota_active(sb, type)) { |
2784 | err = -ESRCH; | |
2785 | goto out; | |
1da177e4 LT |
2786 | } |
2787 | mi = sb_dqopt(sb)->info + type; | |
5eacb2ac JK |
2788 | if (ii->i_fieldmask & QC_FLAGS) { |
2789 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
ca6cb091 JK |
2790 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) { |
2791 | err = -EINVAL; | |
2792 | goto out; | |
2793 | } | |
2794 | } | |
1da177e4 | 2795 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2796 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2797 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2798 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2799 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2800 | if (ii->i_fieldmask & QC_FLAGS) { | |
2801 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2802 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2803 | else | |
2804 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2805 | } | |
1da177e4 LT |
2806 | spin_unlock(&dq_data_lock); |
2807 | mark_info_dirty(sb, type); | |
2808 | /* Force write to disk */ | |
2809 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2810 | out: |
d3be915f | 2811 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
f55abc0f | 2812 | return err; |
1da177e4 | 2813 | } |
287a8095 | 2814 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2815 | |
287a8095 CH |
2816 | const struct quotactl_ops dquot_quotactl_ops = { |
2817 | .quota_on = dquot_quota_on, | |
2818 | .quota_off = dquot_quota_off, | |
2819 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2820 | .get_state = dquot_get_state, |
287a8095 CH |
2821 | .set_info = dquot_set_dqinfo, |
2822 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2823 | .get_nextdqblk = dquot_get_next_dqblk, |
287a8095 | 2824 | .set_dqblk = dquot_set_dqblk |
1da177e4 | 2825 | }; |
287a8095 | 2826 | EXPORT_SYMBOL(dquot_quotactl_ops); |
dde95888 | 2827 | |
3e2af67e JK |
2828 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2829 | .quota_enable = dquot_quota_enable, | |
2830 | .quota_disable = dquot_quota_disable, | |
2831 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2832 | .get_state = dquot_get_state, |
3e2af67e JK |
2833 | .set_info = dquot_set_dqinfo, |
2834 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2835 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2836 | .set_dqblk = dquot_set_dqblk |
2837 | }; | |
2838 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2839 | ||
dde95888 DM |
2840 | static int do_proc_dqstats(struct ctl_table *table, int write, |
2841 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2842 | { | |
dde95888 | 2843 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2844 | |
2845 | /* Update global table */ | |
2846 | dqstats.stat[type] = | |
2847 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2848 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2849 | } | |
2850 | ||
e628753b | 2851 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2852 | { |
1da177e4 | 2853 | .procname = "lookups", |
dde95888 | 2854 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2855 | .maxlen = sizeof(int), |
2856 | .mode = 0444, | |
dde95888 | 2857 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2858 | }, |
2859 | { | |
1da177e4 | 2860 | .procname = "drops", |
dde95888 | 2861 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2862 | .maxlen = sizeof(int), |
2863 | .mode = 0444, | |
dde95888 | 2864 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2865 | }, |
2866 | { | |
1da177e4 | 2867 | .procname = "reads", |
dde95888 | 2868 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2869 | .maxlen = sizeof(int), |
2870 | .mode = 0444, | |
dde95888 | 2871 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2872 | }, |
2873 | { | |
1da177e4 | 2874 | .procname = "writes", |
dde95888 | 2875 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2876 | .maxlen = sizeof(int), |
2877 | .mode = 0444, | |
dde95888 | 2878 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2879 | }, |
2880 | { | |
1da177e4 | 2881 | .procname = "cache_hits", |
dde95888 | 2882 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2883 | .maxlen = sizeof(int), |
2884 | .mode = 0444, | |
dde95888 | 2885 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2886 | }, |
2887 | { | |
1da177e4 | 2888 | .procname = "allocated_dquots", |
dde95888 | 2889 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2890 | .maxlen = sizeof(int), |
2891 | .mode = 0444, | |
dde95888 | 2892 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2893 | }, |
2894 | { | |
1da177e4 | 2895 | .procname = "free_dquots", |
dde95888 | 2896 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2897 | .maxlen = sizeof(int), |
2898 | .mode = 0444, | |
dde95888 | 2899 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2900 | }, |
2901 | { | |
1da177e4 | 2902 | .procname = "syncs", |
dde95888 | 2903 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2904 | .maxlen = sizeof(int), |
2905 | .mode = 0444, | |
dde95888 | 2906 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2907 | }, |
8e893469 | 2908 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2909 | { |
1da177e4 LT |
2910 | .procname = "warnings", |
2911 | .data = &flag_print_warnings, | |
2912 | .maxlen = sizeof(int), | |
2913 | .mode = 0644, | |
6d456111 | 2914 | .proc_handler = proc_dointvec, |
1da177e4 | 2915 | }, |
8e893469 | 2916 | #endif |
ab09203e | 2917 | { }, |
1da177e4 LT |
2918 | }; |
2919 | ||
e628753b | 2920 | static struct ctl_table fs_table[] = { |
1da177e4 | 2921 | { |
1da177e4 LT |
2922 | .procname = "quota", |
2923 | .mode = 0555, | |
2924 | .child = fs_dqstats_table, | |
2925 | }, | |
ab09203e | 2926 | { }, |
1da177e4 LT |
2927 | }; |
2928 | ||
e628753b | 2929 | static struct ctl_table sys_table[] = { |
1da177e4 | 2930 | { |
1da177e4 LT |
2931 | .procname = "fs", |
2932 | .mode = 0555, | |
2933 | .child = fs_table, | |
2934 | }, | |
ab09203e | 2935 | { }, |
1da177e4 LT |
2936 | }; |
2937 | ||
2938 | static int __init dquot_init(void) | |
2939 | { | |
f32764bd | 2940 | int i, ret; |
1da177e4 LT |
2941 | unsigned long nr_hash, order; |
2942 | ||
2943 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2944 | ||
0b4d4147 | 2945 | register_sysctl_table(sys_table); |
1da177e4 | 2946 | |
20c2df83 | 2947 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2948 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2949 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2950 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2951 | NULL); |
1da177e4 LT |
2952 | |
2953 | order = 0; | |
2954 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2955 | if (!dquot_hash) | |
2956 | panic("Cannot create dquot hash table"); | |
2957 | ||
f32764bd | 2958 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2959 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2960 | if (ret) |
2961 | panic("Cannot create dquot stat counters"); | |
2962 | } | |
dde95888 | 2963 | |
1da177e4 LT |
2964 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2965 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2966 | dq_hash_bits = 0; | |
2967 | do { | |
2968 | dq_hash_bits++; | |
2969 | } while (nr_hash >> dq_hash_bits); | |
2970 | dq_hash_bits--; | |
2971 | ||
2972 | nr_hash = 1UL << dq_hash_bits; | |
2973 | dq_hash_mask = nr_hash - 1; | |
2974 | for (i = 0; i < nr_hash; i++) | |
2975 | INIT_HLIST_HEAD(dquot_hash + i); | |
2976 | ||
19858e7b AB |
2977 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2978 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2979 | |
8e1f936b | 2980 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2981 | |
2982 | return 0; | |
2983 | } | |
331221fa | 2984 | fs_initcall(dquot_init); |