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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
3 | * is implemented using the BSD system call interface as the means of | |
4 | * communication with the user level. This file contains the generic routines | |
5 | * called by the different filesystems on allocation of an inode or block. | |
6 | * These routines take care of the administration needed to have a consistent | |
7 | * diskquota tracking system. The ideas of both user and group quotas are based | |
8 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
9 | * implementation is based on one of the several variants of the LINUX | |
10 | * inode-subsystem with added complexity of the diskquota system. | |
11 | * | |
1da177e4 LT |
12 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
13 | * | |
14 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
15 | * | |
16 | * Revised list management to avoid races | |
17 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
18 | * | |
19 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
20 | * As the consequence the locking was moved from dquot_decr_...(), | |
21 | * dquot_incr_...() to calling functions. | |
22 | * invalidate_dquots() now writes modified dquots. | |
23 | * Serialized quota_off() and quota_on() for mount point. | |
24 | * Fixed a few bugs in grow_dquots(). | |
25 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
26 | * quota files | |
27 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
28 | * add_dquot_ref() restarts after blocking | |
29 | * Added check for bogus uid and fixed check for group in quotactl. | |
30 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
31 | * | |
32 | * Used struct list_head instead of own list struct | |
33 | * Invalidation of referenced dquots is no longer possible | |
34 | * Improved free_dquots list management | |
35 | * Quota and i_blocks are now updated in one place to avoid races | |
36 | * Warnings are now delayed so we won't block in critical section | |
37 | * Write updated not to require dquot lock | |
38 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
39 | * | |
40 | * Added dynamic quota structure allocation | |
41 | * Jan Kara <jack@suse.cz> 12/2000 | |
42 | * | |
43 | * Rewritten quota interface. Implemented new quota format and | |
44 | * formats registering. | |
45 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
46 | * | |
47 | * New SMP locking. | |
48 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
49 | * | |
50 | * Added journalled quota support, fix lock inversion problems | |
51 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
52 | * | |
53 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
54 | */ | |
55 | ||
56 | #include <linux/errno.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/fs.h> | |
59 | #include <linux/mount.h> | |
60 | #include <linux/mm.h> | |
61 | #include <linux/time.h> | |
62 | #include <linux/types.h> | |
63 | #include <linux/string.h> | |
64 | #include <linux/fcntl.h> | |
65 | #include <linux/stat.h> | |
66 | #include <linux/tty.h> | |
67 | #include <linux/file.h> | |
68 | #include <linux/slab.h> | |
69 | #include <linux/sysctl.h> | |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/module.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/security.h> | |
40401530 | 74 | #include <linux/sched.h> |
5b825c3a | 75 | #include <linux/cred.h> |
1da177e4 LT |
76 | #include <linux/kmod.h> |
77 | #include <linux/namei.h> | |
16f7e0fe | 78 | #include <linux/capability.h> |
be586bab | 79 | #include <linux/quotaops.h> |
55fa6091 | 80 | #include "../internal.h" /* ugh */ |
1da177e4 | 81 | |
f3da9310 | 82 | #include <linux/uaccess.h> |
1da177e4 | 83 | |
1da177e4 | 84 | /* |
cc33412f | 85 | * There are three quota SMP locks. dq_list_lock protects all lists with quotas |
dde95888 | 86 | * and quota formats. |
cc33412f JK |
87 | * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and |
88 | * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. | |
1da177e4 | 89 | * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly |
cc33412f JK |
90 | * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects |
91 | * modifications of quota state (on quotaon and quotaoff) and readers who care | |
92 | * about latest values take it as well. | |
1da177e4 | 93 | * |
cc33412f JK |
94 | * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, |
95 | * dq_list_lock > dq_state_lock | |
1da177e4 LT |
96 | * |
97 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
98 | * the life of the dquot structure and so needn't to be protected by a lock | |
99 | * | |
b9ba6f94 NY |
100 | * Operation accessing dquots via inode pointers are protected by dquot_srcu. |
101 | * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and | |
102 | * synchronize_srcu(&dquot_srcu) is called after clearing pointers from | |
103 | * inode and before dropping dquot references to avoid use of dquots after | |
104 | * they are freed. dq_data_lock is used to serialize the pointer setting and | |
105 | * clearing operations. | |
26245c94 JK |
106 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that |
107 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
b9ba6f94 NY |
108 | * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they |
109 | * have to do all pointer modifications before dropping dq_data_lock. This makes | |
26245c94 JK |
110 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and |
111 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 112 | * |
d3be915f | 113 | * Each dquot has its dq_lock mutex. Locked dquots might not be referenced |
1da177e4 LT |
114 | * from inodes (dquot_alloc_space() and such don't check the dq_lock). |
115 | * Currently dquot is locked only when it is being read to memory (or space for | |
116 | * it is being allocated) on the first dqget() and when it is being released on | |
117 | * the last dqput(). The allocation and release oparations are serialized by | |
118 | * the dq_lock and by checking the use count in dquot_release(). Write | |
119 | * operations on dquots don't hold dq_lock as they copy data under dq_data_lock | |
120 | * spinlock to internal buffers before writing. | |
121 | * | |
122 | * Lock ordering (including related VFS locks) is the following: | |
bc8230ee | 123 | * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem |
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 | 408 | mutex_lock(&dquot->dq_lock); |
62676838 JK |
409 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { |
410 | down_read(&dqopt->dqio_sem); | |
4c376dca | 411 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
62676838 JK |
412 | up_read(&dqopt->dqio_sem); |
413 | } | |
1da177e4 LT |
414 | if (ret < 0) |
415 | goto out_iolock; | |
044c9b67 JK |
416 | /* Make sure flags update is visible after dquot has been filled */ |
417 | smp_mb__before_atomic(); | |
1da177e4 LT |
418 | set_bit(DQ_READ_B, &dquot->dq_flags); |
419 | /* Instantiate dquot if needed */ | |
420 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
62676838 | 421 | down_write(&dqopt->dqio_sem); |
4c376dca | 422 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 423 | /* Write the info if needed */ |
4c376dca EB |
424 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
425 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
426 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 427 | } |
62676838 | 428 | up_write(&dqopt->dqio_sem); |
1da177e4 LT |
429 | if (ret < 0) |
430 | goto out_iolock; | |
431 | if (ret2 < 0) { | |
432 | ret = ret2; | |
433 | goto out_iolock; | |
434 | } | |
435 | } | |
044c9b67 JK |
436 | /* |
437 | * Make sure flags update is visible after on-disk struct has been | |
438 | * allocated. Paired with smp_rmb() in dqget(). | |
439 | */ | |
440 | smp_mb__before_atomic(); | |
1da177e4 LT |
441 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
442 | out_iolock: | |
d3be915f | 443 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
444 | return ret; |
445 | } | |
08d0350c | 446 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
447 | |
448 | /* | |
449 | * Write dquot to disk | |
450 | */ | |
451 | int dquot_commit(struct dquot *dquot) | |
452 | { | |
b03f2456 | 453 | int ret = 0; |
1da177e4 LT |
454 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
455 | ||
bc8230ee | 456 | down_write(&dqopt->dqio_sem); |
1da177e4 LT |
457 | spin_lock(&dq_list_lock); |
458 | if (!clear_dquot_dirty(dquot)) { | |
459 | spin_unlock(&dq_list_lock); | |
460 | goto out_sem; | |
461 | } | |
462 | spin_unlock(&dq_list_lock); | |
463 | /* Inactive dquot can be only if there was error during read/init | |
464 | * => we have better not writing it */ | |
b03f2456 | 465 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 466 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
467 | else |
468 | ret = -EIO; | |
1da177e4 | 469 | out_sem: |
bc8230ee | 470 | up_write(&dqopt->dqio_sem); |
1da177e4 LT |
471 | return ret; |
472 | } | |
08d0350c | 473 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
474 | |
475 | /* | |
476 | * Release dquot | |
477 | */ | |
478 | int dquot_release(struct dquot *dquot) | |
479 | { | |
480 | int ret = 0, ret2 = 0; | |
481 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
482 | ||
d3be915f | 483 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
484 | /* Check whether we are not racing with some other dqget() */ |
485 | if (atomic_read(&dquot->dq_count) > 1) | |
486 | goto out_dqlock; | |
bc8230ee | 487 | down_write(&dqopt->dqio_sem); |
4c376dca EB |
488 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
489 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 490 | /* Write the info */ |
4c376dca EB |
491 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
492 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
493 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 494 | } |
1da177e4 LT |
495 | if (ret >= 0) |
496 | ret = ret2; | |
497 | } | |
498 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
bc8230ee | 499 | up_write(&dqopt->dqio_sem); |
1da177e4 | 500 | out_dqlock: |
d3be915f | 501 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
502 | return ret; |
503 | } | |
08d0350c | 504 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 505 | |
7d9056ba | 506 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
507 | { |
508 | kmem_cache_free(dquot_cachep, dquot); | |
509 | } | |
7d9056ba | 510 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
511 | |
512 | static inline void do_destroy_dquot(struct dquot *dquot) | |
513 | { | |
514 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* Invalidate all dquots on the list. Note that this function is called after |
518 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
519 | * quota users. There can still be some users of quotas due to inodes being |
520 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 521 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 522 | */ |
1da177e4 LT |
523 | static void invalidate_dquots(struct super_block *sb, int type) |
524 | { | |
c33ed271 | 525 | struct dquot *dquot, *tmp; |
1da177e4 | 526 | |
6362e4d4 | 527 | restart: |
1da177e4 | 528 | spin_lock(&dq_list_lock); |
c33ed271 | 529 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
530 | if (dquot->dq_sb != sb) |
531 | continue; | |
4c376dca | 532 | if (dquot->dq_id.type != type) |
1da177e4 | 533 | continue; |
6362e4d4 JK |
534 | /* Wait for dquot users */ |
535 | if (atomic_read(&dquot->dq_count)) { | |
536 | DEFINE_WAIT(wait); | |
537 | ||
9f985cb6 | 538 | dqgrab(dquot); |
6362e4d4 JK |
539 | prepare_to_wait(&dquot->dq_wait_unused, &wait, |
540 | TASK_UNINTERRUPTIBLE); | |
541 | spin_unlock(&dq_list_lock); | |
542 | /* Once dqput() wakes us up, we know it's time to free | |
543 | * the dquot. | |
544 | * IMPORTANT: we rely on the fact that there is always | |
545 | * at most one process waiting for dquot to free. | |
546 | * Otherwise dq_count would be > 1 and we would never | |
547 | * wake up. | |
548 | */ | |
549 | if (atomic_read(&dquot->dq_count) > 1) | |
550 | schedule(); | |
551 | finish_wait(&dquot->dq_wait_unused, &wait); | |
552 | dqput(dquot); | |
553 | /* At this moment dquot() need not exist (it could be | |
554 | * reclaimed by prune_dqcache(). Hence we must | |
555 | * restart. */ | |
556 | goto restart; | |
557 | } | |
558 | /* | |
559 | * Quota now has no users and it has been written on last | |
560 | * dqput() | |
561 | */ | |
1da177e4 LT |
562 | remove_dquot_hash(dquot); |
563 | remove_free_dquot(dquot); | |
564 | remove_inuse(dquot); | |
74f783af | 565 | do_destroy_dquot(dquot); |
1da177e4 LT |
566 | } |
567 | spin_unlock(&dq_list_lock); | |
568 | } | |
569 | ||
12c77527 JK |
570 | /* Call callback for every active dquot on given filesystem */ |
571 | int dquot_scan_active(struct super_block *sb, | |
572 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
573 | unsigned long priv) | |
574 | { | |
575 | struct dquot *dquot, *old_dquot = NULL; | |
576 | int ret = 0; | |
577 | ||
ee1ac541 JK |
578 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
579 | ||
12c77527 JK |
580 | spin_lock(&dq_list_lock); |
581 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
582 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
583 | continue; | |
584 | if (dquot->dq_sb != sb) | |
585 | continue; | |
586 | /* Now we have active dquot so we can just increase use count */ | |
587 | atomic_inc(&dquot->dq_count); | |
12c77527 | 588 | spin_unlock(&dq_list_lock); |
dde95888 | 589 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
590 | dqput(old_dquot); |
591 | old_dquot = dquot; | |
1362f4ea JK |
592 | /* |
593 | * ->release_dquot() can be racing with us. Our reference | |
594 | * protects us from new calls to it so just wait for any | |
595 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
596 | */ | |
597 | wait_on_dquot(dquot); | |
598 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
599 | ret = fn(dquot, priv); | |
600 | if (ret < 0) | |
601 | goto out; | |
602 | } | |
12c77527 JK |
603 | spin_lock(&dq_list_lock); |
604 | /* We are safe to continue now because our dquot could not | |
605 | * be moved out of the inuse list while we hold the reference */ | |
606 | } | |
607 | spin_unlock(&dq_list_lock); | |
608 | out: | |
609 | dqput(old_dquot); | |
12c77527 JK |
610 | return ret; |
611 | } | |
08d0350c | 612 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 613 | |
ceed1723 JK |
614 | /* Write all dquot structures to quota files */ |
615 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
616 | { |
617 | struct list_head *dirty; | |
618 | struct dquot *dquot; | |
619 | struct quota_info *dqopt = sb_dqopt(sb); | |
620 | int cnt; | |
ceed1723 | 621 | int err, ret = 0; |
1da177e4 | 622 | |
9d1ccbe7 JK |
623 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
624 | ||
1da177e4 LT |
625 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
626 | if (type != -1 && cnt != type) | |
627 | continue; | |
f55abc0f | 628 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
629 | continue; |
630 | spin_lock(&dq_list_lock); | |
631 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
632 | while (!list_empty(dirty)) { | |
268157ba JK |
633 | dquot = list_first_entry(dirty, struct dquot, |
634 | dq_dirty); | |
1da177e4 LT |
635 | /* Dirty and inactive can be only bad dquot... */ |
636 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
637 | clear_dquot_dirty(dquot); | |
638 | continue; | |
639 | } | |
640 | /* Now we have active dquot from which someone is | |
641 | * holding reference so we can safely just increase | |
642 | * use count */ | |
9f985cb6 | 643 | dqgrab(dquot); |
1da177e4 | 644 | spin_unlock(&dq_list_lock); |
dde95888 | 645 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 JK |
646 | err = sb->dq_op->write_dquot(dquot); |
647 | if (!ret && err) | |
474d2605 | 648 | ret = err; |
1da177e4 LT |
649 | dqput(dquot); |
650 | spin_lock(&dq_list_lock); | |
651 | } | |
652 | spin_unlock(&dq_list_lock); | |
653 | } | |
654 | ||
655 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
656 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
657 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 658 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 659 | dqstats_inc(DQST_SYNCS); |
1da177e4 | 660 | |
ceed1723 JK |
661 | return ret; |
662 | } | |
663 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
664 | ||
665 | /* Write all dquot structures to disk and make them visible from userspace */ | |
666 | int dquot_quota_sync(struct super_block *sb, int type) | |
667 | { | |
668 | struct quota_info *dqopt = sb_dqopt(sb); | |
669 | int cnt; | |
670 | int ret; | |
671 | ||
672 | ret = dquot_writeback_dquots(sb, type); | |
673 | if (ret) | |
674 | return ret; | |
675 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
676 | return 0; |
677 | ||
678 | /* This is not very clever (and fast) but currently I don't know about | |
679 | * any other simple way of getting quota data to disk and we must get | |
680 | * them there for userspace to be visible... */ | |
681 | if (sb->s_op->sync_fs) | |
682 | sb->s_op->sync_fs(sb, 1); | |
683 | sync_blockdev(sb->s_bdev); | |
684 | ||
685 | /* | |
686 | * Now when everything is written we can discard the pagecache so | |
687 | * that userspace sees the changes. | |
688 | */ | |
5fb324ad CH |
689 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
690 | if (type != -1 && cnt != type) | |
691 | continue; | |
692 | if (!sb_has_quota_active(sb, cnt)) | |
693 | continue; | |
5955102c | 694 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 695 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 696 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 697 | } |
5fb324ad | 698 | |
1da177e4 LT |
699 | return 0; |
700 | } | |
287a8095 | 701 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 702 | |
1ab6c499 DC |
703 | static unsigned long |
704 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 LT |
705 | { |
706 | struct list_head *head; | |
707 | struct dquot *dquot; | |
1ab6c499 | 708 | unsigned long freed = 0; |
1da177e4 | 709 | |
d68aab6b | 710 | spin_lock(&dq_list_lock); |
1da177e4 | 711 | head = free_dquots.prev; |
1ab6c499 | 712 | while (head != &free_dquots && sc->nr_to_scan) { |
1da177e4 LT |
713 | dquot = list_entry(head, struct dquot, dq_free); |
714 | remove_dquot_hash(dquot); | |
715 | remove_free_dquot(dquot); | |
716 | remove_inuse(dquot); | |
74f783af | 717 | do_destroy_dquot(dquot); |
1ab6c499 DC |
718 | sc->nr_to_scan--; |
719 | freed++; | |
1da177e4 LT |
720 | head = free_dquots.prev; |
721 | } | |
d68aab6b | 722 | spin_unlock(&dq_list_lock); |
1ab6c499 | 723 | return freed; |
1da177e4 LT |
724 | } |
725 | ||
1ab6c499 DC |
726 | static unsigned long |
727 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 728 | { |
55f841ce GC |
729 | return vfs_pressure_ratio( |
730 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
731 | } |
732 | ||
8e1f936b | 733 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
734 | .count_objects = dqcache_shrink_count, |
735 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
736 | .seeks = DEFAULT_SEEKS, |
737 | }; | |
738 | ||
1da177e4 LT |
739 | /* |
740 | * Put reference to dquot | |
1da177e4 | 741 | */ |
3d9ea253 | 742 | void dqput(struct dquot *dquot) |
1da177e4 | 743 | { |
b48d3805 JK |
744 | int ret; |
745 | ||
1da177e4 LT |
746 | if (!dquot) |
747 | return; | |
62af9b52 | 748 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 749 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 750 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
751 | quotatypes[dquot->dq_id.type], |
752 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
753 | BUG(); |
754 | } | |
755 | #endif | |
dde95888 | 756 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
757 | we_slept: |
758 | spin_lock(&dq_list_lock); | |
759 | if (atomic_read(&dquot->dq_count) > 1) { | |
760 | /* We have more than one user... nothing to do */ | |
761 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 762 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 763 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 JK |
764 | atomic_read(&dquot->dq_count) == 1) |
765 | wake_up(&dquot->dq_wait_unused); | |
1da177e4 LT |
766 | spin_unlock(&dq_list_lock); |
767 | return; | |
768 | } | |
769 | /* Need to release dquot? */ | |
770 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { | |
771 | spin_unlock(&dq_list_lock); | |
772 | /* Commit dquot before releasing */ | |
b48d3805 JK |
773 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
774 | if (ret < 0) { | |
fb5ffb0e JZ |
775 | quota_error(dquot->dq_sb, "Can't write quota structure" |
776 | " (error %d). Quota may get out of sync!", | |
777 | ret); | |
b48d3805 JK |
778 | /* |
779 | * We clear dirty bit anyway, so that we avoid | |
780 | * infinite loop here | |
781 | */ | |
782 | spin_lock(&dq_list_lock); | |
783 | clear_dquot_dirty(dquot); | |
784 | spin_unlock(&dq_list_lock); | |
785 | } | |
1da177e4 LT |
786 | goto we_slept; |
787 | } | |
788 | /* Clear flag in case dquot was inactive (something bad happened) */ | |
789 | clear_dquot_dirty(dquot); | |
790 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
791 | spin_unlock(&dq_list_lock); | |
792 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
793 | goto we_slept; | |
794 | } | |
795 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 796 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 797 | /* sanity check */ |
8abf6a47 | 798 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
799 | #endif |
800 | put_dquot_last(dquot); | |
801 | spin_unlock(&dq_list_lock); | |
802 | } | |
08d0350c | 803 | EXPORT_SYMBOL(dqput); |
1da177e4 | 804 | |
7d9056ba | 805 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
806 | { |
807 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
808 | } | |
7d9056ba | 809 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 810 | |
1da177e4 LT |
811 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
812 | { | |
813 | struct dquot *dquot; | |
814 | ||
74f783af | 815 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 816 | if(!dquot) |
dd6f3c6d | 817 | return NULL; |
1da177e4 | 818 | |
d3be915f | 819 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
820 | INIT_LIST_HEAD(&dquot->dq_free); |
821 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
822 | INIT_HLIST_NODE(&dquot->dq_hash); | |
823 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
6362e4d4 | 824 | init_waitqueue_head(&dquot->dq_wait_unused); |
1da177e4 | 825 | dquot->dq_sb = sb; |
1a06d420 | 826 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 LT |
827 | atomic_set(&dquot->dq_count, 1); |
828 | ||
829 | return dquot; | |
830 | } | |
831 | ||
832 | /* | |
833 | * Get reference to dquot | |
cc33412f JK |
834 | * |
835 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
836 | * destroying our dquot by: | |
837 | * a) checking for quota flags under dq_list_lock and | |
838 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 839 | */ |
aca645a6 | 840 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 841 | { |
1a06d420 | 842 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 843 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 844 | |
d49d3762 EB |
845 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
846 | return ERR_PTR(-EINVAL); | |
847 | ||
1a06d420 | 848 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 849 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
850 | we_slept: |
851 | spin_lock(&dq_list_lock); | |
cc33412f | 852 | spin_lock(&dq_state_lock); |
1a06d420 | 853 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
854 | spin_unlock(&dq_state_lock); |
855 | spin_unlock(&dq_list_lock); | |
6184fc0b | 856 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
857 | goto out; |
858 | } | |
859 | spin_unlock(&dq_state_lock); | |
860 | ||
1a06d420 | 861 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
862 | if (!dquot) { |
863 | if (!empty) { | |
1da177e4 | 864 | spin_unlock(&dq_list_lock); |
1a06d420 | 865 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 866 | if (!empty) |
1da177e4 LT |
867 | schedule(); /* Try to wait for a moment... */ |
868 | goto we_slept; | |
869 | } | |
870 | dquot = empty; | |
dd6f3c6d | 871 | empty = NULL; |
4c376dca | 872 | dquot->dq_id = qid; |
1da177e4 LT |
873 | /* all dquots go on the inuse_list */ |
874 | put_inuse(dquot); | |
875 | /* hash it first so it can be found */ | |
876 | insert_dquot_hash(dquot); | |
1da177e4 | 877 | spin_unlock(&dq_list_lock); |
dde95888 | 878 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
879 | } else { |
880 | if (!atomic_read(&dquot->dq_count)) | |
881 | remove_free_dquot(dquot); | |
882 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 883 | spin_unlock(&dq_list_lock); |
dde95888 DM |
884 | dqstats_inc(DQST_CACHE_HITS); |
885 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 886 | } |
268157ba JK |
887 | /* Wait for dq_lock - after this we know that either dquot_release() is |
888 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 889 | wait_on_dquot(dquot); |
268157ba | 890 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
891 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
892 | int err; | |
893 | ||
894 | err = sb->dq_op->acquire_dquot(dquot); | |
895 | if (err < 0) { | |
896 | dqput(dquot); | |
897 | dquot = ERR_PTR(err); | |
898 | goto out; | |
899 | } | |
1da177e4 | 900 | } |
044c9b67 JK |
901 | /* |
902 | * Make sure following reads see filled structure - paired with | |
903 | * smp_mb__before_atomic() in dquot_acquire(). | |
904 | */ | |
905 | smp_rmb(); | |
62af9b52 | 906 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 907 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 908 | #endif |
cc33412f JK |
909 | out: |
910 | if (empty) | |
911 | do_destroy_dquot(empty); | |
1da177e4 LT |
912 | |
913 | return dquot; | |
914 | } | |
08d0350c | 915 | EXPORT_SYMBOL(dqget); |
1da177e4 | 916 | |
2d0fa467 JK |
917 | static inline struct dquot **i_dquot(struct inode *inode) |
918 | { | |
2d0fa467 JK |
919 | return inode->i_sb->s_op->get_dquots(inode); |
920 | } | |
921 | ||
1da177e4 LT |
922 | static int dqinit_needed(struct inode *inode, int type) |
923 | { | |
5bcd3b6f | 924 | struct dquot * const *dquots; |
1da177e4 LT |
925 | int cnt; |
926 | ||
927 | if (IS_NOQUOTA(inode)) | |
928 | return 0; | |
5bcd3b6f KK |
929 | |
930 | dquots = i_dquot(inode); | |
1da177e4 | 931 | if (type != -1) |
5bcd3b6f | 932 | return !dquots[type]; |
1da177e4 | 933 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 934 | if (!dquots[cnt]) |
1da177e4 LT |
935 | return 1; |
936 | return 0; | |
937 | } | |
938 | ||
c3b00446 | 939 | /* This routine is guarded by s_umount semaphore */ |
1da177e4 LT |
940 | static void add_dquot_ref(struct super_block *sb, int type) |
941 | { | |
941d2380 | 942 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 943 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 944 | int reserved = 0; |
4c5e6c0e | 945 | #endif |
1da177e4 | 946 | |
74278da9 | 947 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 948 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
949 | spin_lock(&inode->i_lock); |
950 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
951 | !atomic_read(&inode->i_writecount) || | |
952 | !dqinit_needed(inode, type)) { | |
953 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 954 | continue; |
250df6ed | 955 | } |
d003fb70 | 956 | __iget(inode); |
250df6ed | 957 | spin_unlock(&inode->i_lock); |
74278da9 | 958 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 959 | |
d7e97117 JK |
960 | #ifdef CONFIG_QUOTA_DEBUG |
961 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
962 | reserved = 1; | |
963 | #endif | |
941d2380 | 964 | iput(old_inode); |
871a2931 | 965 | __dquot_initialize(inode, type); |
55fa6091 DC |
966 | |
967 | /* | |
968 | * We hold a reference to 'inode' so it couldn't have been | |
969 | * removed from s_inodes list while we dropped the | |
74278da9 | 970 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 971 | * holding the last reference and we cannot iput it under |
74278da9 | 972 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
973 | * later. |
974 | */ | |
941d2380 | 975 | old_inode = inode; |
74278da9 | 976 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 977 | } |
74278da9 | 978 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 979 | iput(old_inode); |
0a5a9c72 | 980 | |
62af9b52 | 981 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 982 | if (reserved) { |
fb5ffb0e JZ |
983 | quota_error(sb, "Writes happened before quota was turned on " |
984 | "thus quota information is probably inconsistent. " | |
985 | "Please run quotacheck(8)"); | |
0a5a9c72 | 986 | } |
4c5e6c0e | 987 | #endif |
1da177e4 LT |
988 | } |
989 | ||
268157ba JK |
990 | /* |
991 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 992 | * if we have the last reference to dquot |
268157ba | 993 | */ |
9eb6463f NY |
994 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
995 | struct list_head *tofree_head) | |
1da177e4 | 996 | { |
5bcd3b6f KK |
997 | struct dquot **dquots = i_dquot(inode); |
998 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 999 | |
9eb6463f NY |
1000 | if (!dquot) |
1001 | return; | |
1002 | ||
5bcd3b6f | 1003 | dquots[type] = NULL; |
9eb6463f NY |
1004 | if (list_empty(&dquot->dq_free)) { |
1005 | /* | |
1006 | * The inode still has reference to dquot so it can't be in the | |
1007 | * free list | |
1008 | */ | |
1009 | spin_lock(&dq_list_lock); | |
1010 | list_add(&dquot->dq_free, tofree_head); | |
1011 | spin_unlock(&dq_list_lock); | |
1012 | } else { | |
1013 | /* | |
1014 | * Dquot is already in a list to put so we won't drop the last | |
1015 | * reference here. | |
1016 | */ | |
1017 | dqput(dquot); | |
1da177e4 | 1018 | } |
1da177e4 LT |
1019 | } |
1020 | ||
268157ba JK |
1021 | /* |
1022 | * Free list of dquots | |
1023 | * Dquots are removed from inodes and no new references can be got so we are | |
1024 | * the only ones holding reference | |
1025 | */ | |
1da177e4 LT |
1026 | static void put_dquot_list(struct list_head *tofree_head) |
1027 | { | |
1028 | struct list_head *act_head; | |
1029 | struct dquot *dquot; | |
1030 | ||
1031 | act_head = tofree_head->next; | |
1da177e4 LT |
1032 | while (act_head != tofree_head) { |
1033 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1034 | act_head = act_head->next; | |
268157ba JK |
1035 | /* Remove dquot from the list so we won't have problems... */ |
1036 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1037 | dqput(dquot); |
1038 | } | |
1039 | } | |
1040 | ||
fb58b731 CH |
1041 | static void remove_dquot_ref(struct super_block *sb, int type, |
1042 | struct list_head *tofree_head) | |
1043 | { | |
1044 | struct inode *inode; | |
7af9cce8 | 1045 | int reserved = 0; |
fb58b731 | 1046 | |
74278da9 | 1047 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1048 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1049 | /* |
1050 | * We have to scan also I_NEW inodes because they can already | |
1051 | * have quota pointer initialized. Luckily, we need to touch | |
1052 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1053 | * (dq_data_lock). |
aabb8fdb | 1054 | */ |
b9ba6f94 | 1055 | spin_lock(&dq_data_lock); |
7af9cce8 DM |
1056 | if (!IS_NOQUOTA(inode)) { |
1057 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1058 | reserved = 1; | |
fb58b731 | 1059 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1060 | } |
b9ba6f94 | 1061 | spin_unlock(&dq_data_lock); |
fb58b731 | 1062 | } |
74278da9 | 1063 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1064 | #ifdef CONFIG_QUOTA_DEBUG |
1065 | if (reserved) { | |
1066 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1067 | " was disabled thus quota information is probably " | |
1068 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1069 | } | |
1070 | #endif | |
fb58b731 CH |
1071 | } |
1072 | ||
1da177e4 LT |
1073 | /* Gather all references from inodes and drop them */ |
1074 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1075 | { | |
1076 | LIST_HEAD(tofree_head); | |
1077 | ||
fb58b731 | 1078 | if (sb->dq_op) { |
fb58b731 | 1079 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1080 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1081 | put_dquot_list(&tofree_head); |
1082 | } | |
1da177e4 LT |
1083 | } |
1084 | ||
12095460 | 1085 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1086 | { |
1087 | dquot->dq_dqb.dqb_curinodes += number; | |
1088 | } | |
1089 | ||
1090 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1091 | { | |
1092 | dquot->dq_dqb.dqb_curspace += number; | |
1093 | } | |
1094 | ||
f18df228 MC |
1095 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1096 | { | |
1097 | dquot->dq_dqb.dqb_rsvspace += number; | |
1098 | } | |
1099 | ||
740d9dcd MC |
1100 | /* |
1101 | * Claim reserved quota space | |
1102 | */ | |
0a5a9c72 | 1103 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1104 | { |
0a5a9c72 JK |
1105 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1106 | WARN_ON_ONCE(1); | |
1107 | number = dquot->dq_dqb.dqb_rsvspace; | |
1108 | } | |
740d9dcd MC |
1109 | dquot->dq_dqb.dqb_curspace += number; |
1110 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1111 | } | |
1112 | ||
1c8924eb JK |
1113 | static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) |
1114 | { | |
1115 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) | |
1116 | number = dquot->dq_dqb.dqb_curspace; | |
1117 | dquot->dq_dqb.dqb_rsvspace += number; | |
1118 | dquot->dq_dqb.dqb_curspace -= number; | |
1119 | } | |
1120 | ||
740d9dcd MC |
1121 | static inline |
1122 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1123 | { | |
0a5a9c72 JK |
1124 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1125 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1126 | else { | |
1127 | WARN_ON_ONCE(1); | |
1128 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1129 | } | |
740d9dcd MC |
1130 | } |
1131 | ||
7a2435d8 | 1132 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1133 | { |
db49d2df JK |
1134 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1135 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1136 | dquot->dq_dqb.dqb_curinodes -= number; |
1137 | else | |
1138 | dquot->dq_dqb.dqb_curinodes = 0; | |
1139 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1140 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1141 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1142 | } | |
1143 | ||
7a2435d8 | 1144 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1145 | { |
db49d2df JK |
1146 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1147 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1148 | dquot->dq_dqb.dqb_curspace -= number; |
1149 | else | |
1150 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1151 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
e008bb61 | 1152 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1153 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1154 | } | |
1155 | ||
bf097aaf JK |
1156 | struct dquot_warn { |
1157 | struct super_block *w_sb; | |
7b9c7321 | 1158 | struct kqid w_dq_id; |
bf097aaf JK |
1159 | short w_type; |
1160 | }; | |
1161 | ||
c525460e JK |
1162 | static int warning_issued(struct dquot *dquot, const int warntype) |
1163 | { | |
1164 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1165 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1166 | ((warntype == QUOTA_NL_IHARDWARN || | |
1167 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1168 | ||
1169 | if (!flag) | |
1170 | return 0; | |
1171 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1172 | } | |
1173 | ||
8e893469 | 1174 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1175 | static int flag_print_warnings = 1; |
1176 | ||
bf097aaf | 1177 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1178 | { |
1179 | if (!flag_print_warnings) | |
1180 | return 0; | |
1181 | ||
7b9c7321 | 1182 | switch (warn->w_dq_id.type) { |
1da177e4 | 1183 | case USRQUOTA: |
1a06d420 | 1184 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1185 | case GRPQUOTA: |
7b9c7321 | 1186 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1187 | case PRJQUOTA: |
1188 | return 1; | |
1da177e4 LT |
1189 | } |
1190 | return 0; | |
1191 | } | |
1192 | ||
1da177e4 | 1193 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1194 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1195 | { |
1196 | char *msg = NULL; | |
24ec839c | 1197 | struct tty_struct *tty; |
bf097aaf | 1198 | int warntype = warn->w_type; |
1da177e4 | 1199 | |
657d3bfa JK |
1200 | if (warntype == QUOTA_NL_IHARDBELOW || |
1201 | warntype == QUOTA_NL_ISOFTBELOW || | |
1202 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1203 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1204 | return; |
1205 | ||
24ec839c PZ |
1206 | tty = get_current_tty(); |
1207 | if (!tty) | |
452a00d2 | 1208 | return; |
bf097aaf | 1209 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1210 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1211 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1212 | else |
24ec839c | 1213 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1214 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1215 | switch (warntype) { |
8e893469 | 1216 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1217 | msg = " file limit reached.\r\n"; |
1218 | break; | |
8e893469 | 1219 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1220 | msg = " file quota exceeded too long.\r\n"; |
1221 | break; | |
8e893469 | 1222 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1223 | msg = " file quota exceeded.\r\n"; |
1224 | break; | |
8e893469 | 1225 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1226 | msg = " block limit reached.\r\n"; |
1227 | break; | |
8e893469 | 1228 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1229 | msg = " block quota exceeded too long.\r\n"; |
1230 | break; | |
8e893469 | 1231 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1232 | msg = " block quota exceeded.\r\n"; |
1233 | break; | |
1234 | } | |
24ec839c | 1235 | tty_write_message(tty, msg); |
452a00d2 | 1236 | tty_kref_put(tty); |
1da177e4 | 1237 | } |
8e893469 JK |
1238 | #endif |
1239 | ||
bf097aaf JK |
1240 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1241 | int warntype) | |
1242 | { | |
1243 | if (warning_issued(dquot, warntype)) | |
1244 | return; | |
1245 | warn->w_type = warntype; | |
1246 | warn->w_sb = dquot->dq_sb; | |
1247 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1248 | } |
1249 | ||
f18df228 MC |
1250 | /* |
1251 | * Write warnings to the console and send warning messages over netlink. | |
1252 | * | |
bf097aaf | 1253 | * Note that this function can call into tty and networking code. |
f18df228 | 1254 | */ |
bf097aaf | 1255 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1256 | { |
1257 | int i; | |
1258 | ||
86e931a3 | 1259 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1260 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1261 | continue; | |
8e893469 | 1262 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1263 | print_warning(&warn[i]); |
8e893469 | 1264 | #endif |
7b9c7321 | 1265 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1266 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1267 | } |
1da177e4 LT |
1268 | } |
1269 | ||
7a2435d8 | 1270 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1271 | { |
4c376dca | 1272 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1273 | |
1274 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1275 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1276 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | /* needs dq_data_lock */ | |
bf097aaf JK |
1280 | static int check_idq(struct dquot *dquot, qsize_t inodes, |
1281 | struct dquot_warn *warn) | |
1da177e4 | 1282 | { |
268157ba JK |
1283 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1284 | ||
4c376dca | 1285 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1286 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1287 | return 0; |
1da177e4 LT |
1288 | |
1289 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1290 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1291 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1292 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
efd8f0e6 | 1293 | return -EDQUOT; |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1297 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1298 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1299 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1300 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1301 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
efd8f0e6 | 1302 | return -EDQUOT; |
1da177e4 LT |
1303 | } |
1304 | ||
1305 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1306 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1307 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1308 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1309 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1310 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 LT |
1311 | } |
1312 | ||
efd8f0e6 | 1313 | return 0; |
1da177e4 LT |
1314 | } |
1315 | ||
1316 | /* needs dq_data_lock */ | |
bf097aaf JK |
1317 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, |
1318 | struct dquot_warn *warn) | |
1da177e4 | 1319 | { |
f18df228 | 1320 | qsize_t tspace; |
268157ba | 1321 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1322 | |
4c376dca | 1323 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1324 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1325 | return 0; |
1da177e4 | 1326 | |
f18df228 MC |
1327 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1328 | + space; | |
1329 | ||
1da177e4 | 1330 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1331 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1332 | !ignore_hardlimit(dquot)) { |
1333 | if (!prealloc) | |
bf097aaf | 1334 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
efd8f0e6 | 1335 | return -EDQUOT; |
1da177e4 LT |
1336 | } |
1337 | ||
1338 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1339 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1340 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1341 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 LT |
1342 | !ignore_hardlimit(dquot)) { |
1343 | if (!prealloc) | |
bf097aaf | 1344 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
efd8f0e6 | 1345 | return -EDQUOT; |
1da177e4 LT |
1346 | } |
1347 | ||
1348 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1349 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1350 | dquot->dq_dqb.dqb_btime == 0) { |
1351 | if (!prealloc) { | |
bf097aaf | 1352 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1353 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1354 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
1da177e4 LT |
1355 | } |
1356 | else | |
1357 | /* | |
1358 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1359 | * be always printed | |
1360 | */ | |
efd8f0e6 | 1361 | return -EDQUOT; |
1da177e4 LT |
1362 | } |
1363 | ||
efd8f0e6 | 1364 | return 0; |
1da177e4 LT |
1365 | } |
1366 | ||
12095460 | 1367 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1368 | { |
268157ba JK |
1369 | qsize_t newinodes; |
1370 | ||
657d3bfa | 1371 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1372 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1373 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1374 | return QUOTA_NL_NOWARN; |
1375 | ||
268157ba JK |
1376 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1377 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1378 | return QUOTA_NL_ISOFTBELOW; |
1379 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1380 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1381 | return QUOTA_NL_IHARDBELOW; |
1382 | return QUOTA_NL_NOWARN; | |
1383 | } | |
1384 | ||
1385 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1386 | { | |
1387 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1388 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1389 | return QUOTA_NL_NOWARN; |
1390 | ||
12095460 | 1391 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1392 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1393 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1394 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1395 | return QUOTA_NL_BHARDBELOW; |
1396 | return QUOTA_NL_NOWARN; | |
1397 | } | |
0a5a9c72 | 1398 | |
189eef59 CH |
1399 | static int dquot_active(const struct inode *inode) |
1400 | { | |
1401 | struct super_block *sb = inode->i_sb; | |
1402 | ||
1403 | if (IS_NOQUOTA(inode)) | |
1404 | return 0; | |
1405 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1406 | } | |
1407 | ||
1da177e4 | 1408 | /* |
871a2931 CH |
1409 | * Initialize quota pointers in inode |
1410 | * | |
871a2931 CH |
1411 | * It is better to call this function outside of any transaction as it |
1412 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1413 | */ |
6184fc0b | 1414 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1415 | { |
1ea06bec | 1416 | int cnt, init_needed = 0; |
ab73ef46 | 1417 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1418 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1419 | qsize_t rsv; |
6184fc0b | 1420 | int ret = 0; |
1da177e4 | 1421 | |
189eef59 | 1422 | if (!dquot_active(inode)) |
6184fc0b | 1423 | return 0; |
cc33412f | 1424 | |
5bcd3b6f KK |
1425 | dquots = i_dquot(inode); |
1426 | ||
cc33412f JK |
1427 | /* First get references to structures we might need. */ |
1428 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1429 | struct kqid qid; |
847aac64 LX |
1430 | kprojid_t projid; |
1431 | int rc; | |
6184fc0b | 1432 | struct dquot *dquot; |
847aac64 | 1433 | |
cc33412f JK |
1434 | if (type != -1 && cnt != type) |
1435 | continue; | |
1ea06bec NY |
1436 | /* |
1437 | * The i_dquot should have been initialized in most cases, | |
1438 | * we check it without locking here to avoid unnecessary | |
1439 | * dqget()/dqput() calls. | |
1440 | */ | |
5bcd3b6f | 1441 | if (dquots[cnt]) |
1ea06bec | 1442 | continue; |
847aac64 LX |
1443 | |
1444 | if (!sb_has_quota_active(sb, cnt)) | |
1445 | continue; | |
1446 | ||
1ea06bec NY |
1447 | init_needed = 1; |
1448 | ||
cc33412f JK |
1449 | switch (cnt) { |
1450 | case USRQUOTA: | |
aca645a6 | 1451 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1452 | break; |
1453 | case GRPQUOTA: | |
aca645a6 | 1454 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1455 | break; |
847aac64 LX |
1456 | case PRJQUOTA: |
1457 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1458 | if (rc) | |
1459 | continue; | |
1460 | qid = make_kqid_projid(projid); | |
1461 | break; | |
cc33412f | 1462 | } |
6184fc0b JK |
1463 | dquot = dqget(sb, qid); |
1464 | if (IS_ERR(dquot)) { | |
1465 | /* We raced with somebody turning quotas off... */ | |
1466 | if (PTR_ERR(dquot) != -ESRCH) { | |
1467 | ret = PTR_ERR(dquot); | |
1468 | goto out_put; | |
1469 | } | |
1470 | dquot = NULL; | |
1471 | } | |
1472 | got[cnt] = dquot; | |
cc33412f JK |
1473 | } |
1474 | ||
1ea06bec NY |
1475 | /* All required i_dquot has been initialized */ |
1476 | if (!init_needed) | |
6184fc0b | 1477 | return 0; |
1ea06bec | 1478 | |
b9ba6f94 | 1479 | spin_lock(&dq_data_lock); |
1da177e4 | 1480 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1481 | goto out_lock; |
1da177e4 LT |
1482 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1483 | if (type != -1 && cnt != type) | |
1484 | continue; | |
cc33412f JK |
1485 | /* Avoid races with quotaoff() */ |
1486 | if (!sb_has_quota_active(sb, cnt)) | |
1487 | continue; | |
4408ea41 JK |
1488 | /* We could race with quotaon or dqget() could have failed */ |
1489 | if (!got[cnt]) | |
1490 | continue; | |
5bcd3b6f KK |
1491 | if (!dquots[cnt]) { |
1492 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1493 | got[cnt] = NULL; |
0a5a9c72 JK |
1494 | /* |
1495 | * Make quota reservation system happy if someone | |
1496 | * did a write before quota was turned on | |
1497 | */ | |
1498 | rsv = inode_get_rsv_space(inode); | |
b9ba6f94 | 1499 | if (unlikely(rsv)) |
5bcd3b6f | 1500 | dquot_resv_space(dquots[cnt], rsv); |
1da177e4 LT |
1501 | } |
1502 | } | |
6184fc0b | 1503 | out_lock: |
b9ba6f94 | 1504 | spin_unlock(&dq_data_lock); |
6184fc0b | 1505 | out_put: |
cc33412f | 1506 | /* Drop unused references */ |
dc52dd3a | 1507 | dqput_all(got); |
6184fc0b JK |
1508 | |
1509 | return ret; | |
871a2931 CH |
1510 | } |
1511 | ||
6184fc0b | 1512 | int dquot_initialize(struct inode *inode) |
871a2931 | 1513 | { |
6184fc0b | 1514 | return __dquot_initialize(inode, -1); |
1da177e4 | 1515 | } |
08d0350c | 1516 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1517 | |
b8cb5a54 TE |
1518 | bool dquot_initialize_needed(struct inode *inode) |
1519 | { | |
1520 | struct dquot **dquots; | |
1521 | int i; | |
1522 | ||
1523 | if (!dquot_active(inode)) | |
1524 | return false; | |
1525 | ||
1526 | dquots = i_dquot(inode); | |
1527 | for (i = 0; i < MAXQUOTAS; i++) | |
1528 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1529 | return true; | |
1530 | return false; | |
1531 | } | |
1532 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1533 | ||
1da177e4 | 1534 | /* |
b9ba6f94 NY |
1535 | * Release all quotas referenced by inode. |
1536 | * | |
1537 | * This function only be called on inode free or converting | |
1538 | * a file to quota file, no other users for the i_dquot in | |
1539 | * both cases, so we needn't call synchronize_srcu() after | |
1540 | * clearing i_dquot. | |
1da177e4 | 1541 | */ |
9f754758 | 1542 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1543 | { |
1544 | int cnt; | |
5bcd3b6f | 1545 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1546 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1547 | |
b9ba6f94 | 1548 | spin_lock(&dq_data_lock); |
1da177e4 | 1549 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1550 | put[cnt] = dquots[cnt]; |
1551 | dquots[cnt] = NULL; | |
1da177e4 | 1552 | } |
b9ba6f94 | 1553 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1554 | dqput_all(put); |
1da177e4 LT |
1555 | } |
1556 | ||
9f754758 CH |
1557 | void dquot_drop(struct inode *inode) |
1558 | { | |
5bcd3b6f | 1559 | struct dquot * const *dquots; |
9f754758 CH |
1560 | int cnt; |
1561 | ||
1562 | if (IS_NOQUOTA(inode)) | |
1563 | return; | |
1564 | ||
1565 | /* | |
1566 | * Test before calling to rule out calls from proc and such | |
1567 | * where we are not allowed to block. Note that this is | |
1568 | * actually reliable test even without the lock - the caller | |
1569 | * must assure that nobody can come after the DQUOT_DROP and | |
1570 | * add quota pointers back anyway. | |
1571 | */ | |
5bcd3b6f | 1572 | dquots = i_dquot(inode); |
9f754758 | 1573 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1574 | if (dquots[cnt]) |
9f754758 CH |
1575 | break; |
1576 | } | |
1577 | ||
1578 | if (cnt < MAXQUOTAS) | |
1579 | __dquot_drop(inode); | |
1580 | } | |
1581 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1582 | |
fd8fbfc1 DM |
1583 | /* |
1584 | * inode_reserved_space is managed internally by quota, and protected by | |
1585 | * i_lock similar to i_blocks+i_bytes. | |
1586 | */ | |
1587 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1588 | { | |
1589 | /* Filesystem must explicitly define it's own method in order to use | |
1590 | * quota reservation interface */ | |
1591 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1592 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1593 | } | |
1594 | ||
c469070a | 1595 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1596 | { |
1597 | spin_lock(&inode->i_lock); | |
1598 | *inode_reserved_space(inode) += number; | |
1599 | spin_unlock(&inode->i_lock); | |
1600 | } | |
c469070a | 1601 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1602 | |
c469070a | 1603 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1604 | { |
1605 | spin_lock(&inode->i_lock); | |
1606 | *inode_reserved_space(inode) -= number; | |
1607 | __inode_add_bytes(inode, number); | |
1608 | spin_unlock(&inode->i_lock); | |
1609 | } | |
c469070a | 1610 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1611 | |
1c8924eb JK |
1612 | void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) |
1613 | { | |
1614 | spin_lock(&inode->i_lock); | |
1615 | *inode_reserved_space(inode) += number; | |
1616 | __inode_sub_bytes(inode, number); | |
1617 | spin_unlock(&inode->i_lock); | |
1618 | } | |
1619 | EXPORT_SYMBOL(inode_reclaim_rsv_space); | |
1620 | ||
c469070a | 1621 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1622 | { |
1623 | spin_lock(&inode->i_lock); | |
1624 | *inode_reserved_space(inode) -= number; | |
1625 | spin_unlock(&inode->i_lock); | |
1626 | } | |
c469070a | 1627 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1628 | |
1629 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1630 | { | |
1631 | qsize_t ret; | |
05b5d898 JK |
1632 | |
1633 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1634 | return 0; | |
fd8fbfc1 DM |
1635 | spin_lock(&inode->i_lock); |
1636 | ret = *inode_reserved_space(inode); | |
1637 | spin_unlock(&inode->i_lock); | |
1638 | return ret; | |
1639 | } | |
1640 | ||
1641 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1642 | int reserve) | |
1643 | { | |
1644 | if (reserve) | |
1645 | inode_add_rsv_space(inode, number); | |
1646 | else | |
1647 | inode_add_bytes(inode, number); | |
1648 | } | |
1649 | ||
1650 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1651 | { | |
1652 | if (reserve) | |
1653 | inode_sub_rsv_space(inode, number); | |
1654 | else | |
1655 | inode_sub_bytes(inode, number); | |
1656 | } | |
1657 | ||
1da177e4 | 1658 | /* |
5dd4056d CH |
1659 | * This functions updates i_blocks+i_bytes fields and quota information |
1660 | * (together with appropriate checks). | |
1661 | * | |
1662 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1663 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1664 | * the current transaction so that dquot write and inode write go into the | |
1665 | * same transaction. | |
1da177e4 LT |
1666 | */ |
1667 | ||
1668 | /* | |
1669 | * This operation can block, but only after everything is updated | |
1670 | */ | |
56246f9a | 1671 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1672 | { |
b9ba6f94 | 1673 | int cnt, ret = 0, index; |
bf097aaf | 1674 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1675 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1676 | struct dquot **dquots; |
1da177e4 | 1677 | |
189eef59 | 1678 | if (!dquot_active(inode)) { |
fd8fbfc1 DM |
1679 | inode_incr_space(inode, number, reserve); |
1680 | goto out; | |
1681 | } | |
1682 | ||
1da177e4 | 1683 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1684 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1685 | |
5bcd3b6f | 1686 | dquots = i_dquot(inode); |
b9ba6f94 | 1687 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1688 | spin_lock(&dq_data_lock); |
1689 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1690 | if (!dquots[cnt]) |
1da177e4 | 1691 | continue; |
bf097aaf JK |
1692 | ret = check_bdq(dquots[cnt], number, |
1693 | !(flags & DQUOT_SPACE_WARN), &warn[cnt]); | |
1694 | if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { | |
fd8fbfc1 DM |
1695 | spin_unlock(&dq_data_lock); |
1696 | goto out_flush_warn; | |
f18df228 | 1697 | } |
1da177e4 LT |
1698 | } |
1699 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1700 | if (!dquots[cnt]) |
1da177e4 | 1701 | continue; |
f18df228 | 1702 | if (reserve) |
bf097aaf | 1703 | dquot_resv_space(dquots[cnt], number); |
f18df228 | 1704 | else |
bf097aaf | 1705 | dquot_incr_space(dquots[cnt], number); |
1da177e4 | 1706 | } |
fd8fbfc1 | 1707 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1708 | spin_unlock(&dq_data_lock); |
f18df228 | 1709 | |
fd8fbfc1 DM |
1710 | if (reserve) |
1711 | goto out_flush_warn; | |
bf097aaf | 1712 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1713 | out_flush_warn: |
b9ba6f94 | 1714 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1715 | flush_warnings(warn); |
f18df228 MC |
1716 | out: |
1717 | return ret; | |
1718 | } | |
5dd4056d | 1719 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1720 | |
1721 | /* | |
1722 | * This operation can block, but only after everything is updated | |
1723 | */ | |
6bab3596 | 1724 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1725 | { |
b9ba6f94 | 1726 | int cnt, ret = 0, index; |
bf097aaf | 1727 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1728 | struct dquot * const *dquots; |
1da177e4 | 1729 | |
189eef59 | 1730 | if (!dquot_active(inode)) |
63936dda | 1731 | return 0; |
1da177e4 | 1732 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1733 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1734 | |
5bcd3b6f | 1735 | dquots = i_dquot(inode); |
b9ba6f94 | 1736 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1737 | spin_lock(&dq_data_lock); |
1738 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1739 | if (!dquots[cnt]) |
1da177e4 | 1740 | continue; |
bf097aaf | 1741 | ret = check_idq(dquots[cnt], 1, &warn[cnt]); |
efd8f0e6 | 1742 | if (ret) |
1da177e4 LT |
1743 | goto warn_put_all; |
1744 | } | |
1745 | ||
1746 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1747 | if (!dquots[cnt]) |
1da177e4 | 1748 | continue; |
bf097aaf | 1749 | dquot_incr_inodes(dquots[cnt], 1); |
1da177e4 | 1750 | } |
efd8f0e6 | 1751 | |
1da177e4 LT |
1752 | warn_put_all: |
1753 | spin_unlock(&dq_data_lock); | |
63936dda | 1754 | if (ret == 0) |
bf097aaf | 1755 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1756 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1757 | flush_warnings(warn); |
1da177e4 LT |
1758 | return ret; |
1759 | } | |
08d0350c | 1760 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1761 | |
5dd4056d CH |
1762 | /* |
1763 | * Convert in-memory reserved quotas to real consumed quotas | |
1764 | */ | |
1765 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1766 | { |
5bcd3b6f | 1767 | struct dquot **dquots; |
b9ba6f94 | 1768 | int cnt, index; |
740d9dcd | 1769 | |
189eef59 | 1770 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1771 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1772 | return 0; |
740d9dcd MC |
1773 | } |
1774 | ||
5bcd3b6f | 1775 | dquots = i_dquot(inode); |
b9ba6f94 | 1776 | index = srcu_read_lock(&dquot_srcu); |
740d9dcd MC |
1777 | spin_lock(&dq_data_lock); |
1778 | /* Claim reserved quotas to allocated quotas */ | |
1779 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
5bcd3b6f KK |
1780 | if (dquots[cnt]) |
1781 | dquot_claim_reserved_space(dquots[cnt], number); | |
740d9dcd MC |
1782 | } |
1783 | /* Update inode bytes */ | |
fd8fbfc1 | 1784 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1785 | spin_unlock(&dq_data_lock); |
5bcd3b6f | 1786 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1787 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1788 | return 0; |
740d9dcd | 1789 | } |
5dd4056d | 1790 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1791 | |
1c8924eb JK |
1792 | /* |
1793 | * Convert allocated space back to in-memory reserved quotas | |
1794 | */ | |
1795 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1796 | { | |
5bcd3b6f | 1797 | struct dquot **dquots; |
b9ba6f94 | 1798 | int cnt, index; |
1c8924eb JK |
1799 | |
1800 | if (!dquot_active(inode)) { | |
1801 | inode_reclaim_rsv_space(inode, number); | |
1802 | return; | |
1803 | } | |
1804 | ||
5bcd3b6f | 1805 | dquots = i_dquot(inode); |
b9ba6f94 | 1806 | index = srcu_read_lock(&dquot_srcu); |
1c8924eb JK |
1807 | spin_lock(&dq_data_lock); |
1808 | /* Claim reserved quotas to allocated quotas */ | |
1809 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
5bcd3b6f KK |
1810 | if (dquots[cnt]) |
1811 | dquot_reclaim_reserved_space(dquots[cnt], number); | |
1c8924eb JK |
1812 | } |
1813 | /* Update inode bytes */ | |
1814 | inode_reclaim_rsv_space(inode, number); | |
1815 | spin_unlock(&dq_data_lock); | |
5bcd3b6f | 1816 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1817 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1818 | return; |
1819 | } | |
1820 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1821 | ||
1da177e4 LT |
1822 | /* |
1823 | * This operation can block, but only after everything is updated | |
1824 | */ | |
56246f9a | 1825 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1826 | { |
1827 | unsigned int cnt; | |
bf097aaf | 1828 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1829 | struct dquot **dquots; |
b9ba6f94 | 1830 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1831 | |
189eef59 | 1832 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1833 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1834 | return; |
1da177e4 | 1835 | } |
657d3bfa | 1836 | |
5bcd3b6f | 1837 | dquots = i_dquot(inode); |
b9ba6f94 | 1838 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1839 | spin_lock(&dq_data_lock); |
1840 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1841 | int wtype; |
1842 | ||
1843 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1844 | if (!dquots[cnt]) | |
1da177e4 | 1845 | continue; |
bf097aaf JK |
1846 | wtype = info_bdq_free(dquots[cnt], number); |
1847 | if (wtype != QUOTA_NL_NOWARN) | |
1848 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1849 | if (reserve) |
bf097aaf | 1850 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1851 | else |
bf097aaf | 1852 | dquot_decr_space(dquots[cnt], number); |
1da177e4 | 1853 | } |
fd8fbfc1 | 1854 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1855 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1856 | |
1857 | if (reserve) | |
1858 | goto out_unlock; | |
bf097aaf | 1859 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1860 | out_unlock: |
b9ba6f94 | 1861 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1862 | flush_warnings(warn); |
fd8fbfc1 | 1863 | } |
5dd4056d | 1864 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1865 | |
1da177e4 LT |
1866 | /* |
1867 | * This operation can block, but only after everything is updated | |
1868 | */ | |
6bab3596 | 1869 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1870 | { |
1871 | unsigned int cnt; | |
bf097aaf | 1872 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1873 | struct dquot * const *dquots; |
b9ba6f94 | 1874 | int index; |
1da177e4 | 1875 | |
189eef59 | 1876 | if (!dquot_active(inode)) |
63936dda | 1877 | return; |
657d3bfa | 1878 | |
5bcd3b6f | 1879 | dquots = i_dquot(inode); |
b9ba6f94 | 1880 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1881 | spin_lock(&dq_data_lock); |
1882 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1883 | int wtype; |
1884 | ||
1885 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1886 | if (!dquots[cnt]) | |
1da177e4 | 1887 | continue; |
bf097aaf JK |
1888 | wtype = info_idq_free(dquots[cnt], 1); |
1889 | if (wtype != QUOTA_NL_NOWARN) | |
1890 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1891 | dquot_decr_inodes(dquots[cnt], 1); | |
1da177e4 LT |
1892 | } |
1893 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1894 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1895 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1896 | flush_warnings(warn); |
1da177e4 | 1897 | } |
08d0350c | 1898 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1899 | |
1900 | /* | |
1901 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1902 | * On success, dquot references in transfer_to are consumed and references |
1903 | * to original dquots that need to be released are placed there. On failure, | |
1904 | * references are kept untouched. | |
1da177e4 LT |
1905 | * |
1906 | * This operation can block, but only after everything is updated | |
1907 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1908 | * |
b9ba6f94 NY |
1909 | * We are holding reference on transfer_from & transfer_to, no need to |
1910 | * protect them by srcu_read_lock(). | |
1da177e4 | 1911 | */ |
bc8e5f07 | 1912 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1913 | { |
740d9dcd MC |
1914 | qsize_t space, cur_space; |
1915 | qsize_t rsv_space = 0; | |
7a9ca53a | 1916 | qsize_t inode_usage = 1; |
bc8e5f07 | 1917 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1918 | int cnt, ret = 0; |
9e32784b | 1919 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1920 | struct dquot_warn warn_to[MAXQUOTAS]; |
1921 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1922 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1923 | |
1da177e4 | 1924 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1925 | return 0; |
7a9ca53a TE |
1926 | |
1927 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1928 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1929 | if (ret) | |
1930 | return ret; | |
1931 | } | |
1932 | ||
cc33412f | 1933 | /* Initialize the arrays */ |
bf097aaf JK |
1934 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1935 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1936 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1937 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1938 | } | |
b9ba6f94 NY |
1939 | |
1940 | spin_lock(&dq_data_lock); | |
cc33412f | 1941 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
b9ba6f94 | 1942 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1943 | return 0; |
cc33412f | 1944 | } |
740d9dcd | 1945 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1946 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1947 | space = cur_space + rsv_space; |
1da177e4 LT |
1948 | /* Build the transfer_from list and check the limits */ |
1949 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b D |
1950 | /* |
1951 | * Skip changes for same uid or gid or for turned off quota-type. | |
1952 | */ | |
dd6f3c6d | 1953 | if (!transfer_to[cnt]) |
1da177e4 | 1954 | continue; |
9e32784b D |
1955 | /* Avoid races with quotaoff() */ |
1956 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1957 | continue; | |
1958 | is_valid[cnt] = 1; | |
2d0fa467 | 1959 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7a9ca53a | 1960 | ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]); |
efd8f0e6 CH |
1961 | if (ret) |
1962 | goto over_quota; | |
bf097aaf | 1963 | ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); |
efd8f0e6 | 1964 | if (ret) |
cc33412f | 1965 | goto over_quota; |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | /* | |
1969 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1970 | */ | |
1971 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b | 1972 | if (!is_valid[cnt]) |
1da177e4 | 1973 | continue; |
1da177e4 LT |
1974 | /* Due to IO error we might not have transfer_from[] structure */ |
1975 | if (transfer_from[cnt]) { | |
bf097aaf | 1976 | int wtype; |
7a9ca53a | 1977 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
1978 | if (wtype != QUOTA_NL_NOWARN) |
1979 | prepare_warning(&warn_from_inodes[cnt], | |
1980 | transfer_from[cnt], wtype); | |
1981 | wtype = info_bdq_free(transfer_from[cnt], space); | |
1982 | if (wtype != QUOTA_NL_NOWARN) | |
1983 | prepare_warning(&warn_from_space[cnt], | |
1984 | transfer_from[cnt], wtype); | |
7a9ca53a | 1985 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
1986 | dquot_decr_space(transfer_from[cnt], cur_space); |
1987 | dquot_free_reserved_space(transfer_from[cnt], | |
1988 | rsv_space); | |
1da177e4 LT |
1989 | } |
1990 | ||
7a9ca53a | 1991 | dquot_incr_inodes(transfer_to[cnt], inode_usage); |
740d9dcd MC |
1992 | dquot_incr_space(transfer_to[cnt], cur_space); |
1993 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 | 1994 | |
2d0fa467 | 1995 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 1996 | } |
1da177e4 | 1997 | spin_unlock(&dq_data_lock); |
cc33412f | 1998 | |
dc52dd3a DM |
1999 | mark_all_dquot_dirty(transfer_from); |
2000 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
2001 | flush_warnings(warn_to); |
2002 | flush_warnings(warn_from_inodes); | |
2003 | flush_warnings(warn_from_space); | |
bc8e5f07 | 2004 | /* Pass back references to put */ |
dc52dd3a | 2005 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
2006 | if (is_valid[cnt]) |
2007 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 2008 | return 0; |
cc33412f JK |
2009 | over_quota: |
2010 | spin_unlock(&dq_data_lock); | |
bf097aaf | 2011 | flush_warnings(warn_to); |
86f3cbec | 2012 | return ret; |
1da177e4 | 2013 | } |
bc8e5f07 | 2014 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2015 | |
8ddd69d6 DM |
2016 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2017 | * Called from FSXXX_setattr() | |
2018 | */ | |
b43fa828 | 2019 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2020 | { |
bc8e5f07 | 2021 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2022 | struct dquot *dquot; |
bc8e5f07 JK |
2023 | struct super_block *sb = inode->i_sb; |
2024 | int ret; | |
8ddd69d6 | 2025 | |
189eef59 | 2026 | if (!dquot_active(inode)) |
bc8e5f07 | 2027 | return 0; |
12755627 | 2028 | |
6184fc0b JK |
2029 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2030 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2031 | if (IS_ERR(dquot)) { | |
2032 | if (PTR_ERR(dquot) != -ESRCH) { | |
2033 | ret = PTR_ERR(dquot); | |
2034 | goto out_put; | |
2035 | } | |
2036 | dquot = NULL; | |
2037 | } | |
2038 | transfer_to[USRQUOTA] = dquot; | |
2039 | } | |
2040 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2041 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2042 | if (IS_ERR(dquot)) { | |
2043 | if (PTR_ERR(dquot) != -ESRCH) { | |
2044 | ret = PTR_ERR(dquot); | |
2045 | goto out_put; | |
2046 | } | |
2047 | dquot = NULL; | |
2048 | } | |
2049 | transfer_to[GRPQUOTA] = dquot; | |
2050 | } | |
bc8e5f07 | 2051 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2052 | out_put: |
bc8e5f07 JK |
2053 | dqput_all(transfer_to); |
2054 | return ret; | |
b85f4b87 | 2055 | } |
b43fa828 | 2056 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2057 | |
1da177e4 LT |
2058 | /* |
2059 | * Write info of quota file to disk | |
2060 | */ | |
2061 | int dquot_commit_info(struct super_block *sb, int type) | |
2062 | { | |
2063 | int ret; | |
2064 | struct quota_info *dqopt = sb_dqopt(sb); | |
2065 | ||
bc8230ee | 2066 | down_write(&dqopt->dqio_sem); |
1da177e4 | 2067 | ret = dqopt->ops[type]->write_file_info(sb, type); |
bc8230ee | 2068 | up_write(&dqopt->dqio_sem); |
1da177e4 LT |
2069 | return ret; |
2070 | } | |
08d0350c | 2071 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2072 | |
be6257b2 JK |
2073 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2074 | { | |
2075 | struct quota_info *dqopt = sb_dqopt(sb); | |
2076 | int err; | |
2077 | ||
9d1ccbe7 JK |
2078 | if (!sb_has_quota_active(sb, qid->type)) |
2079 | return -ESRCH; | |
2080 | if (!dqopt->ops[qid->type]->get_next_id) | |
2081 | return -ENOSYS; | |
0cff9151 | 2082 | down_read(&dqopt->dqio_sem); |
be6257b2 | 2083 | err = dqopt->ops[qid->type]->get_next_id(sb, qid); |
0cff9151 | 2084 | up_read(&dqopt->dqio_sem); |
be6257b2 JK |
2085 | return err; |
2086 | } | |
2087 | EXPORT_SYMBOL(dquot_get_next_id); | |
2088 | ||
1da177e4 LT |
2089 | /* |
2090 | * Definitions of diskquota operations. | |
2091 | */ | |
61e225dc | 2092 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2093 | .write_dquot = dquot_commit, |
2094 | .acquire_dquot = dquot_acquire, | |
2095 | .release_dquot = dquot_release, | |
2096 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2097 | .write_info = dquot_commit_info, |
2098 | .alloc_dquot = dquot_alloc, | |
2099 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2100 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2101 | }; |
123e9caf | 2102 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2103 | |
907f4554 CH |
2104 | /* |
2105 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2106 | */ | |
2107 | int dquot_file_open(struct inode *inode, struct file *file) | |
2108 | { | |
2109 | int error; | |
2110 | ||
2111 | error = generic_file_open(inode, file); | |
2112 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 2113 | dquot_initialize(inode); |
907f4554 CH |
2114 | return error; |
2115 | } | |
2116 | EXPORT_SYMBOL(dquot_file_open); | |
2117 | ||
1da177e4 LT |
2118 | /* |
2119 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2120 | */ | |
0f0dd62f | 2121 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2122 | { |
0ff5af83 | 2123 | int cnt, ret = 0; |
1da177e4 LT |
2124 | struct quota_info *dqopt = sb_dqopt(sb); |
2125 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2126 | |
7d6cd73d JK |
2127 | /* s_umount should be held in exclusive mode */ |
2128 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2129 | up_read(&sb->s_umount); | |
2130 | ||
f55abc0f JK |
2131 | /* Cannot turn off usage accounting without turning off limits, or |
2132 | * suspend quotas and simultaneously turn quotas off. */ | |
2133 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2134 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2135 | DQUOT_USAGE_ENABLED))) | |
2136 | return -EINVAL; | |
2137 | ||
9377abd0 JK |
2138 | /* |
2139 | * Skip everything if there's nothing to do. We have to do this because | |
2140 | * sometimes we are called when fill_super() failed and calling | |
2141 | * sync_fs() in such cases does no good. | |
2142 | */ | |
c3b00446 | 2143 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2144 | return 0; |
c3b00446 | 2145 | |
1da177e4 LT |
2146 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2147 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2148 | if (type != -1 && cnt != type) |
2149 | continue; | |
f55abc0f | 2150 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2151 | continue; |
f55abc0f JK |
2152 | |
2153 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2154 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2155 | dqopt->flags |= |
2156 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2157 | spin_unlock(&dq_state_lock); |
f55abc0f | 2158 | } else { |
cc33412f | 2159 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2160 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2161 | /* Turning off suspended quotas? */ | |
2162 | if (!sb_has_quota_loaded(sb, cnt) && | |
2163 | sb_has_quota_suspended(sb, cnt)) { | |
2164 | dqopt->flags &= ~dquot_state_flag( | |
2165 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2166 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2167 | iput(dqopt->files[cnt]); |
2168 | dqopt->files[cnt] = NULL; | |
2169 | continue; | |
2170 | } | |
cc33412f | 2171 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2172 | } |
f55abc0f JK |
2173 | |
2174 | /* We still have to keep quota loaded? */ | |
2175 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2176 | continue; |
1da177e4 LT |
2177 | |
2178 | /* Note: these are blocking operations */ | |
2179 | drop_dquot_ref(sb, cnt); | |
2180 | invalidate_dquots(sb, cnt); | |
2181 | /* | |
268157ba JK |
2182 | * Now all dquots should be invalidated, all writes done so we |
2183 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2184 | */ |
2185 | if (info_dirty(&dqopt->info[cnt])) | |
2186 | sb->dq_op->write_info(sb, cnt); | |
2187 | if (dqopt->ops[cnt]->free_file_info) | |
2188 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2189 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2190 | ||
2191 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2192 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2193 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2194 | dqopt->info[cnt].dqi_flags = 0; |
2195 | dqopt->info[cnt].dqi_igrace = 0; | |
2196 | dqopt->info[cnt].dqi_bgrace = 0; | |
2197 | dqopt->ops[cnt] = NULL; | |
2198 | } | |
ca785ec6 JK |
2199 | |
2200 | /* Skip syncing and setting flags if quota files are hidden */ | |
2201 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2202 | goto put_inodes; | |
2203 | ||
1da177e4 | 2204 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2205 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2206 | if (sb->s_op->sync_fs) |
2207 | sb->s_op->sync_fs(sb, 1); | |
2208 | sync_blockdev(sb->s_bdev); | |
2209 | /* Now the quota files are just ordinary files and we can set the | |
2210 | * inode flags back. Moreover we discard the pagecache so that | |
2211 | * userspace sees the writes we did bypassing the pagecache. We | |
2212 | * must also discard the blockdev buffers so that we see the | |
2213 | * changes done by userspace on the next quotaon() */ | |
2214 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2700e606 JK |
2215 | /* This can happen when suspending quotas on remount-ro... */ |
2216 | if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { | |
c3b00446 | 2217 | inode_lock(toputinode[cnt]); |
aad6cde9 | 2218 | toputinode[cnt]->i_flags &= ~S_NOQUOTA; |
c3b00446 JK |
2219 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); |
2220 | inode_unlock(toputinode[cnt]); | |
2221 | mark_inode_dirty_sync(toputinode[cnt]); | |
ca785ec6 JK |
2222 | } |
2223 | if (sb->s_bdev) | |
2224 | invalidate_bdev(sb->s_bdev); | |
2225 | put_inodes: | |
2226 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2227 | if (toputinode[cnt]) { | |
0ff5af83 | 2228 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2229 | * can reenable quota on the subsequent remount RW. We |
2230 | * have to check 'flags' variable and not use sb_has_ | |
2231 | * function because another quotaon / quotaoff could | |
2232 | * change global state before we got here. We refuse | |
2233 | * to suspend quotas when there is pending delete on | |
2234 | * the quota file... */ | |
2235 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2236 | iput(toputinode[cnt]); |
2237 | else if (!toputinode[cnt]->i_nlink) | |
2238 | ret = -EBUSY; | |
1da177e4 | 2239 | } |
0ff5af83 | 2240 | return ret; |
1da177e4 | 2241 | } |
0f0dd62f | 2242 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2243 | |
287a8095 | 2244 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2245 | { |
0f0dd62f CH |
2246 | return dquot_disable(sb, type, |
2247 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2248 | } |
287a8095 | 2249 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2250 | |
1da177e4 LT |
2251 | /* |
2252 | * Turn quotas on on a device | |
2253 | */ | |
2254 | ||
f55abc0f JK |
2255 | /* |
2256 | * Helper function to turn quotas on when we already have the inode of | |
2257 | * quota file and no quota information is loaded. | |
2258 | */ | |
2259 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2260 | unsigned int flags) | |
1da177e4 LT |
2261 | { |
2262 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2263 | struct super_block *sb = inode->i_sb; | |
2264 | struct quota_info *dqopt = sb_dqopt(sb); | |
2265 | int error; | |
1da177e4 LT |
2266 | |
2267 | if (!fmt) | |
2268 | return -ESRCH; | |
2269 | if (!S_ISREG(inode->i_mode)) { | |
2270 | error = -EACCES; | |
2271 | goto out_fmt; | |
2272 | } | |
2273 | if (IS_RDONLY(inode)) { | |
2274 | error = -EROFS; | |
2275 | goto out_fmt; | |
2276 | } | |
847aac64 LX |
2277 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2278 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2279 | error = -EINVAL; |
2280 | goto out_fmt; | |
2281 | } | |
5c004828 EB |
2282 | /* Filesystems outside of init_user_ns not yet supported */ |
2283 | if (sb->s_user_ns != &init_user_ns) { | |
2284 | error = -EINVAL; | |
2285 | goto out_fmt; | |
2286 | } | |
f55abc0f JK |
2287 | /* Usage always has to be set... */ |
2288 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2289 | error = -EINVAL; | |
2290 | goto out_fmt; | |
2291 | } | |
c3b00446 JK |
2292 | if (sb_has_quota_loaded(sb, type)) { |
2293 | error = -EBUSY; | |
2294 | goto out_fmt; | |
2295 | } | |
1da177e4 | 2296 | |
ca785ec6 | 2297 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2298 | /* As we bypass the pagecache we must now flush all the |
2299 | * dirty data and invalidate caches so that kernel sees | |
2300 | * changes from userspace. It is not enough to just flush | |
2301 | * the quota file since if blocksize < pagesize, invalidation | |
2302 | * of the cache could fail because of other unrelated dirty | |
2303 | * data */ | |
2304 | sync_filesystem(sb); | |
ca785ec6 JK |
2305 | invalidate_bdev(sb->s_bdev); |
2306 | } | |
ca785ec6 JK |
2307 | |
2308 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2309 | /* We don't want quota and atime on quota files (deadlocks | |
2310 | * possible) Also nobody should write to the file - we use | |
2311 | * special IO operations which ignore the immutable bit. */ | |
5955102c | 2312 | inode_lock(inode); |
aad6cde9 | 2313 | inode->i_flags |= S_NOQUOTA; |
5955102c | 2314 | inode_unlock(inode); |
26245c94 JK |
2315 | /* |
2316 | * When S_NOQUOTA is set, remove dquot references as no more | |
2317 | * references can be added | |
2318 | */ | |
9f754758 | 2319 | __dquot_drop(inode); |
ca785ec6 | 2320 | } |
1da177e4 LT |
2321 | |
2322 | error = -EIO; | |
2323 | dqopt->files[type] = igrab(inode); | |
2324 | if (!dqopt->files[type]) | |
c3b00446 | 2325 | goto out_file_flags; |
1da177e4 LT |
2326 | error = -EINVAL; |
2327 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2328 | goto out_file_init; | |
2329 | ||
2330 | dqopt->ops[type] = fmt->qf_ops; | |
2331 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2332 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2333 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
d6ab3661 | 2334 | down_read(&dqopt->dqio_sem); |
268157ba JK |
2335 | error = dqopt->ops[type]->read_file_info(sb, type); |
2336 | if (error < 0) { | |
d6ab3661 | 2337 | up_read(&dqopt->dqio_sem); |
1da177e4 LT |
2338 | goto out_file_init; |
2339 | } | |
46fe44ce JK |
2340 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) |
2341 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; | |
d6ab3661 | 2342 | up_read(&dqopt->dqio_sem); |
cc33412f | 2343 | spin_lock(&dq_state_lock); |
f55abc0f | 2344 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2345 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2346 | |
2347 | add_dquot_ref(sb, type); | |
1da177e4 LT |
2348 | |
2349 | return 0; | |
2350 | ||
2351 | out_file_init: | |
2352 | dqopt->files[type] = NULL; | |
2353 | iput(inode); | |
c3b00446 | 2354 | out_file_flags: |
aad6cde9 JK |
2355 | inode_lock(inode); |
2356 | inode->i_flags &= ~S_NOQUOTA; | |
2357 | inode_unlock(inode); | |
1da177e4 LT |
2358 | out_fmt: |
2359 | put_quota_format(fmt); | |
2360 | ||
2361 | return error; | |
2362 | } | |
2363 | ||
0ff5af83 | 2364 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2365 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2366 | { |
2367 | struct quota_info *dqopt = sb_dqopt(sb); | |
2368 | struct inode *inode; | |
0f0dd62f | 2369 | int ret = 0, cnt; |
f55abc0f | 2370 | unsigned int flags; |
0ff5af83 | 2371 | |
7d6cd73d JK |
2372 | /* s_umount should be held in exclusive mode */ |
2373 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2374 | up_read(&sb->s_umount); | |
2375 | ||
0f0dd62f CH |
2376 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2377 | if (type != -1 && cnt != type) | |
2378 | continue; | |
c3b00446 | 2379 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2380 | continue; |
c3b00446 | 2381 | |
0f0dd62f CH |
2382 | inode = dqopt->files[cnt]; |
2383 | dqopt->files[cnt] = NULL; | |
2384 | spin_lock(&dq_state_lock); | |
2385 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2386 | DQUOT_LIMITS_ENABLED, | |
2387 | cnt); | |
2388 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2389 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2390 | |
0f0dd62f CH |
2391 | flags = dquot_generic_flag(flags, cnt); |
2392 | ret = vfs_load_quota_inode(inode, cnt, | |
2393 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2394 | iput(inode); | |
2395 | } | |
0ff5af83 JK |
2396 | |
2397 | return ret; | |
2398 | } | |
0f0dd62f | 2399 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2400 | |
f00c9e44 | 2401 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2402 | const struct path *path) |
77e69dac AV |
2403 | { |
2404 | int error = security_quota_on(path->dentry); | |
2405 | if (error) | |
2406 | return error; | |
2407 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2408 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2409 | error = -EXDEV; |
2410 | else | |
dea655c2 | 2411 | error = vfs_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2412 | format_id, DQUOT_USAGE_ENABLED | |
2413 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2414 | return error; |
2415 | } | |
287a8095 | 2416 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2417 | |
f55abc0f JK |
2418 | /* |
2419 | * More powerful function for turning on quotas allowing setting | |
2420 | * of individual quota flags | |
2421 | */ | |
287a8095 CH |
2422 | int dquot_enable(struct inode *inode, int type, int format_id, |
2423 | unsigned int flags) | |
f55abc0f | 2424 | { |
f55abc0f | 2425 | struct super_block *sb = inode->i_sb; |
f55abc0f JK |
2426 | |
2427 | /* Just unsuspend quotas? */ | |
0f0dd62f | 2428 | BUG_ON(flags & DQUOT_SUSPENDED); |
7d6cd73d JK |
2429 | /* s_umount should be held in exclusive mode */ |
2430 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2431 | up_read(&sb->s_umount); | |
0f0dd62f | 2432 | |
f55abc0f JK |
2433 | if (!flags) |
2434 | return 0; | |
2435 | /* Just updating flags needed? */ | |
2436 | if (sb_has_quota_loaded(sb, type)) { | |
f55abc0f | 2437 | if (flags & DQUOT_USAGE_ENABLED && |
c3b00446 JK |
2438 | sb_has_quota_usage_enabled(sb, type)) |
2439 | return -EBUSY; | |
f55abc0f | 2440 | if (flags & DQUOT_LIMITS_ENABLED && |
c3b00446 JK |
2441 | sb_has_quota_limits_enabled(sb, type)) |
2442 | return -EBUSY; | |
cc33412f | 2443 | spin_lock(&dq_state_lock); |
f55abc0f | 2444 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2445 | spin_unlock(&dq_state_lock); |
c3b00446 | 2446 | return 0; |
f55abc0f JK |
2447 | } |
2448 | ||
f55abc0f JK |
2449 | return vfs_load_quota_inode(inode, type, format_id, flags); |
2450 | } | |
287a8095 | 2451 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2452 | |
1da177e4 LT |
2453 | /* |
2454 | * This function is used when filesystem needs to initialize quotas | |
2455 | * during mount time. | |
2456 | */ | |
287a8095 | 2457 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2458 | int format_id, int type) |
1da177e4 | 2459 | { |
84de856e | 2460 | struct dentry *dentry; |
1da177e4 LT |
2461 | int error; |
2462 | ||
e12a4e8a | 2463 | dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2464 | if (IS_ERR(dentry)) |
2465 | return PTR_ERR(dentry); | |
2466 | ||
dea655c2 | 2467 | if (d_really_is_negative(dentry)) { |
154f484b JK |
2468 | error = -ENOENT; |
2469 | goto out; | |
2470 | } | |
2471 | ||
1da177e4 | 2472 | error = security_quota_on(dentry); |
84de856e | 2473 | if (!error) |
dea655c2 | 2474 | error = vfs_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2475 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2476 | |
154f484b | 2477 | out: |
84de856e CH |
2478 | dput(dentry); |
2479 | return error; | |
1da177e4 | 2480 | } |
287a8095 | 2481 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2482 | |
3e2af67e JK |
2483 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2484 | { | |
2485 | int ret; | |
2486 | int type; | |
2487 | struct quota_info *dqopt = sb_dqopt(sb); | |
2488 | ||
2489 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2490 | return -ENOSYS; | |
2491 | /* Accounting cannot be turned on while fs is mounted */ | |
2492 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2493 | if (!flags) | |
2494 | return -EINVAL; | |
2495 | for (type = 0; type < MAXQUOTAS; type++) { | |
2496 | if (!(flags & qtype_enforce_flag(type))) | |
2497 | continue; | |
2498 | /* Can't enforce without accounting */ | |
2499 | if (!sb_has_quota_usage_enabled(sb, type)) | |
2500 | return -EINVAL; | |
2501 | ret = dquot_enable(dqopt->files[type], type, | |
2502 | dqopt->info[type].dqi_fmt_id, | |
2503 | DQUOT_LIMITS_ENABLED); | |
2504 | if (ret < 0) | |
2505 | goto out_err; | |
2506 | } | |
2507 | return 0; | |
2508 | out_err: | |
2509 | /* Backout enforcement enablement we already did */ | |
2510 | for (type--; type >= 0; type--) { | |
2511 | if (flags & qtype_enforce_flag(type)) | |
2512 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2513 | } | |
2514 | /* Error code translation for better compatibility with XFS */ | |
2515 | if (ret == -EBUSY) | |
2516 | ret = -EEXIST; | |
2517 | return ret; | |
2518 | } | |
2519 | ||
2520 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2521 | { | |
2522 | int ret; | |
2523 | int type; | |
2524 | struct quota_info *dqopt = sb_dqopt(sb); | |
2525 | ||
2526 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2527 | return -ENOSYS; | |
2528 | /* | |
2529 | * We don't support turning off accounting via quotactl. In principle | |
2530 | * quota infrastructure can do this but filesystems don't expect | |
2531 | * userspace to be able to do it. | |
2532 | */ | |
2533 | if (flags & | |
2534 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2535 | return -EOPNOTSUPP; | |
2536 | ||
2537 | /* Filter out limits not enabled */ | |
2538 | for (type = 0; type < MAXQUOTAS; type++) | |
2539 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2540 | flags &= ~qtype_enforce_flag(type); | |
2541 | /* Nothing left? */ | |
2542 | if (!flags) | |
2543 | return -EEXIST; | |
2544 | for (type = 0; type < MAXQUOTAS; type++) { | |
2545 | if (flags & qtype_enforce_flag(type)) { | |
2546 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2547 | if (ret < 0) | |
2548 | goto out_err; | |
2549 | } | |
2550 | } | |
2551 | return 0; | |
2552 | out_err: | |
2553 | /* Backout enforcement disabling we already did */ | |
2554 | for (type--; type >= 0; type--) { | |
2555 | if (flags & qtype_enforce_flag(type)) | |
2556 | dquot_enable(dqopt->files[type], type, | |
2557 | dqopt->info[type].dqi_fmt_id, | |
2558 | DQUOT_LIMITS_ENABLED); | |
2559 | } | |
2560 | return ret; | |
2561 | } | |
2562 | ||
1da177e4 | 2563 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2564 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2565 | { |
2566 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2567 | ||
b9b2dd36 | 2568 | memset(di, 0, sizeof(*di)); |
1da177e4 | 2569 | spin_lock(&dq_data_lock); |
14bf61ff JK |
2570 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2571 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2572 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2573 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2574 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2575 | di->d_ino_count = dm->dqb_curinodes; | |
2576 | di->d_spc_timer = dm->dqb_btime; | |
2577 | di->d_ino_timer = dm->dqb_itime; | |
1da177e4 LT |
2578 | spin_unlock(&dq_data_lock); |
2579 | } | |
2580 | ||
74a8a103 | 2581 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2582 | struct qc_dqblk *di) |
1da177e4 LT |
2583 | { |
2584 | struct dquot *dquot; | |
2585 | ||
aca645a6 | 2586 | dquot = dqget(sb, qid); |
6184fc0b JK |
2587 | if (IS_ERR(dquot)) |
2588 | return PTR_ERR(dquot); | |
1da177e4 LT |
2589 | do_get_dqblk(dquot, di); |
2590 | dqput(dquot); | |
cc33412f | 2591 | |
1da177e4 LT |
2592 | return 0; |
2593 | } | |
287a8095 | 2594 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2595 | |
be6257b2 JK |
2596 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2597 | struct qc_dqblk *di) | |
2598 | { | |
2599 | struct dquot *dquot; | |
2600 | int err; | |
2601 | ||
2602 | if (!sb->dq_op->get_next_id) | |
2603 | return -ENOSYS; | |
2604 | err = sb->dq_op->get_next_id(sb, qid); | |
2605 | if (err < 0) | |
2606 | return err; | |
2607 | dquot = dqget(sb, *qid); | |
2608 | if (IS_ERR(dquot)) | |
2609 | return PTR_ERR(dquot); | |
2610 | do_get_dqblk(dquot, di); | |
2611 | dqput(dquot); | |
2612 | ||
2613 | return 0; | |
2614 | } | |
2615 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2616 | ||
14bf61ff JK |
2617 | #define VFS_QC_MASK \ |
2618 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2619 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2620 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2621 | |
1da177e4 | 2622 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2623 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2624 | { |
2625 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2626 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2627 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2628 | |
14bf61ff | 2629 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2630 | return -EINVAL; |
2631 | ||
14bf61ff | 2632 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2633 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2634 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2635 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2636 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2637 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2638 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2639 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2640 | return -ERANGE; |
1da177e4 LT |
2641 | |
2642 | spin_lock(&dq_data_lock); | |
14bf61ff JK |
2643 | if (di->d_fieldmask & QC_SPACE) { |
2644 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2645 | check_blim = 1; |
08261673 | 2646 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2647 | } |
c472b432 | 2648 | |
14bf61ff JK |
2649 | if (di->d_fieldmask & QC_SPC_SOFT) |
2650 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2651 | if (di->d_fieldmask & QC_SPC_HARD) | |
2652 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2653 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2654 | check_blim = 1; |
08261673 | 2655 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2656 | } |
c472b432 | 2657 | |
14bf61ff JK |
2658 | if (di->d_fieldmask & QC_INO_COUNT) { |
2659 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2660 | check_ilim = 1; |
08261673 | 2661 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2662 | } |
c472b432 | 2663 | |
14bf61ff | 2664 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2665 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2666 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2667 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2668 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2669 | check_ilim = 1; |
08261673 | 2670 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2671 | } |
c472b432 | 2672 | |
14bf61ff JK |
2673 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2674 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2675 | check_blim = 1; |
08261673 | 2676 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2677 | } |
c472b432 | 2678 | |
14bf61ff JK |
2679 | if (di->d_fieldmask & QC_INO_TIMER) { |
2680 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2681 | check_ilim = 1; |
08261673 | 2682 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2683 | } |
1da177e4 LT |
2684 | |
2685 | if (check_blim) { | |
268157ba JK |
2686 | if (!dm->dqb_bsoftlimit || |
2687 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2688 | dm->dqb_btime = 0; |
2689 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2690 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2691 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2692 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2693 | } |
2694 | if (check_ilim) { | |
268157ba JK |
2695 | if (!dm->dqb_isoftlimit || |
2696 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2697 | dm->dqb_itime = 0; |
2698 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2699 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2700 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2701 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2702 | } |
268157ba JK |
2703 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2704 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2705 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2706 | else | |
2707 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2708 | spin_unlock(&dq_data_lock); | |
2709 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2710 | |
2711 | return 0; | |
1da177e4 LT |
2712 | } |
2713 | ||
74a8a103 | 2714 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2715 | struct qc_dqblk *di) |
1da177e4 LT |
2716 | { |
2717 | struct dquot *dquot; | |
338bf9af | 2718 | int rc; |
1da177e4 | 2719 | |
aca645a6 | 2720 | dquot = dqget(sb, qid); |
6184fc0b JK |
2721 | if (IS_ERR(dquot)) { |
2722 | rc = PTR_ERR(dquot); | |
f55abc0f | 2723 | goto out; |
1da177e4 | 2724 | } |
338bf9af | 2725 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2726 | dqput(dquot); |
f55abc0f | 2727 | out: |
338bf9af | 2728 | return rc; |
1da177e4 | 2729 | } |
287a8095 | 2730 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2731 | |
2732 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2733 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2734 | { |
2735 | struct mem_dqinfo *mi; | |
0a240339 JK |
2736 | struct qc_type_state *tstate; |
2737 | struct quota_info *dqopt = sb_dqopt(sb); | |
2738 | int type; | |
1da177e4 | 2739 | |
0a240339 JK |
2740 | memset(state, 0, sizeof(*state)); |
2741 | for (type = 0; type < MAXQUOTAS; type++) { | |
2742 | if (!sb_has_quota_active(sb, type)) | |
2743 | continue; | |
2744 | tstate = state->s_state + type; | |
2745 | mi = sb_dqopt(sb)->info + type; | |
2746 | tstate->flags = QCI_ACCT_ENABLED; | |
2747 | spin_lock(&dq_data_lock); | |
2748 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2749 | tstate->flags |= QCI_SYSFILE; | |
2750 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2751 | tstate->flags |= QCI_ROOT_SQUASH; | |
2752 | if (sb_has_quota_limits_enabled(sb, type)) | |
2753 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2754 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2755 | tstate->ino_timelimit = mi->dqi_igrace; | |
2756 | tstate->ino = dqopt->files[type]->i_ino; | |
2757 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2758 | tstate->nextents = 1; /* We don't know... */ | |
2759 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2760 | } |
1da177e4 LT |
2761 | return 0; |
2762 | } | |
0a240339 | 2763 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2764 | |
2765 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2766 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2767 | { |
2768 | struct mem_dqinfo *mi; | |
f55abc0f | 2769 | int err = 0; |
1da177e4 | 2770 | |
5eacb2ac JK |
2771 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2772 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2773 | return -EINVAL; | |
9d1ccbe7 JK |
2774 | if (!sb_has_quota_active(sb, type)) |
2775 | return -ESRCH; | |
1da177e4 | 2776 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2777 | if (ii->i_fieldmask & QC_FLAGS) { |
2778 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2779 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2780 | return -EINVAL; | |
ca6cb091 | 2781 | } |
1da177e4 | 2782 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2783 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2784 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2785 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2786 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2787 | if (ii->i_fieldmask & QC_FLAGS) { | |
2788 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2789 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2790 | else | |
2791 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2792 | } | |
1da177e4 LT |
2793 | spin_unlock(&dq_data_lock); |
2794 | mark_info_dirty(sb, type); | |
2795 | /* Force write to disk */ | |
2796 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2797 | return err; |
1da177e4 | 2798 | } |
287a8095 | 2799 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2800 | |
3e2af67e JK |
2801 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2802 | .quota_enable = dquot_quota_enable, | |
2803 | .quota_disable = dquot_quota_disable, | |
2804 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2805 | .get_state = dquot_get_state, |
3e2af67e JK |
2806 | .set_info = dquot_set_dqinfo, |
2807 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2808 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2809 | .set_dqblk = dquot_set_dqblk |
2810 | }; | |
2811 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2812 | ||
dde95888 DM |
2813 | static int do_proc_dqstats(struct ctl_table *table, int write, |
2814 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2815 | { | |
dde95888 | 2816 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2817 | |
2818 | /* Update global table */ | |
2819 | dqstats.stat[type] = | |
2820 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2821 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2822 | } | |
2823 | ||
e628753b | 2824 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2825 | { |
1da177e4 | 2826 | .procname = "lookups", |
dde95888 | 2827 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2828 | .maxlen = sizeof(int), |
2829 | .mode = 0444, | |
dde95888 | 2830 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2831 | }, |
2832 | { | |
1da177e4 | 2833 | .procname = "drops", |
dde95888 | 2834 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2835 | .maxlen = sizeof(int), |
2836 | .mode = 0444, | |
dde95888 | 2837 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2838 | }, |
2839 | { | |
1da177e4 | 2840 | .procname = "reads", |
dde95888 | 2841 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2842 | .maxlen = sizeof(int), |
2843 | .mode = 0444, | |
dde95888 | 2844 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2845 | }, |
2846 | { | |
1da177e4 | 2847 | .procname = "writes", |
dde95888 | 2848 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2849 | .maxlen = sizeof(int), |
2850 | .mode = 0444, | |
dde95888 | 2851 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2852 | }, |
2853 | { | |
1da177e4 | 2854 | .procname = "cache_hits", |
dde95888 | 2855 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2856 | .maxlen = sizeof(int), |
2857 | .mode = 0444, | |
dde95888 | 2858 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2859 | }, |
2860 | { | |
1da177e4 | 2861 | .procname = "allocated_dquots", |
dde95888 | 2862 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2863 | .maxlen = sizeof(int), |
2864 | .mode = 0444, | |
dde95888 | 2865 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2866 | }, |
2867 | { | |
1da177e4 | 2868 | .procname = "free_dquots", |
dde95888 | 2869 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2870 | .maxlen = sizeof(int), |
2871 | .mode = 0444, | |
dde95888 | 2872 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2873 | }, |
2874 | { | |
1da177e4 | 2875 | .procname = "syncs", |
dde95888 | 2876 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2877 | .maxlen = sizeof(int), |
2878 | .mode = 0444, | |
dde95888 | 2879 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2880 | }, |
8e893469 | 2881 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2882 | { |
1da177e4 LT |
2883 | .procname = "warnings", |
2884 | .data = &flag_print_warnings, | |
2885 | .maxlen = sizeof(int), | |
2886 | .mode = 0644, | |
6d456111 | 2887 | .proc_handler = proc_dointvec, |
1da177e4 | 2888 | }, |
8e893469 | 2889 | #endif |
ab09203e | 2890 | { }, |
1da177e4 LT |
2891 | }; |
2892 | ||
e628753b | 2893 | static struct ctl_table fs_table[] = { |
1da177e4 | 2894 | { |
1da177e4 LT |
2895 | .procname = "quota", |
2896 | .mode = 0555, | |
2897 | .child = fs_dqstats_table, | |
2898 | }, | |
ab09203e | 2899 | { }, |
1da177e4 LT |
2900 | }; |
2901 | ||
e628753b | 2902 | static struct ctl_table sys_table[] = { |
1da177e4 | 2903 | { |
1da177e4 LT |
2904 | .procname = "fs", |
2905 | .mode = 0555, | |
2906 | .child = fs_table, | |
2907 | }, | |
ab09203e | 2908 | { }, |
1da177e4 LT |
2909 | }; |
2910 | ||
2911 | static int __init dquot_init(void) | |
2912 | { | |
f32764bd | 2913 | int i, ret; |
1da177e4 LT |
2914 | unsigned long nr_hash, order; |
2915 | ||
2916 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2917 | ||
0b4d4147 | 2918 | register_sysctl_table(sys_table); |
1da177e4 | 2919 | |
20c2df83 | 2920 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2921 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2922 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2923 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2924 | NULL); |
1da177e4 LT |
2925 | |
2926 | order = 0; | |
2927 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2928 | if (!dquot_hash) | |
2929 | panic("Cannot create dquot hash table"); | |
2930 | ||
f32764bd | 2931 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2932 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2933 | if (ret) |
2934 | panic("Cannot create dquot stat counters"); | |
2935 | } | |
dde95888 | 2936 | |
1da177e4 LT |
2937 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2938 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2939 | dq_hash_bits = 0; | |
2940 | do { | |
2941 | dq_hash_bits++; | |
2942 | } while (nr_hash >> dq_hash_bits); | |
2943 | dq_hash_bits--; | |
2944 | ||
2945 | nr_hash = 1UL << dq_hash_bits; | |
2946 | dq_hash_mask = nr_hash - 1; | |
2947 | for (i = 0; i < nr_hash; i++) | |
2948 | INIT_HLIST_HEAD(dquot_hash + i); | |
2949 | ||
19858e7b AB |
2950 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2951 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2952 | |
8e1f936b | 2953 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2954 | |
2955 | return 0; | |
2956 | } | |
331221fa | 2957 | fs_initcall(dquot_init); |