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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 | * |
5e8cb9b6 JK |
113 | * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to |
114 | * memory (or space for it is being allocated) on the first dqget(), when it is | |
115 | * being written out, and when it is being released on the last dqput(). The | |
116 | * allocation and release operations are serialized by the dq_lock and by | |
117 | * checking the use count in dquot_release(). | |
1da177e4 LT |
118 | * |
119 | * Lock ordering (including related VFS locks) is the following: | |
bc8230ee | 120 | * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem |
1da177e4 LT |
121 | */ |
122 | ||
c516610c JK |
123 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
124 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
125 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 126 | EXPORT_SYMBOL(dq_data_lock); |
b9ba6f94 | 127 | DEFINE_STATIC_SRCU(dquot_srcu); |
1da177e4 | 128 | |
503330f3 JK |
129 | static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); |
130 | ||
fb5ffb0e | 131 | void __quota_error(struct super_block *sb, const char *func, |
055adcbd | 132 | const char *fmt, ...) |
fb5ffb0e | 133 | { |
fb5ffb0e | 134 | if (printk_ratelimit()) { |
055adcbd JP |
135 | va_list args; |
136 | struct va_format vaf; | |
137 | ||
fb5ffb0e | 138 | va_start(args, fmt); |
055adcbd JP |
139 | |
140 | vaf.fmt = fmt; | |
141 | vaf.va = &args; | |
142 | ||
143 | printk(KERN_ERR "Quota error (device %s): %s: %pV\n", | |
144 | sb->s_id, func, &vaf); | |
145 | ||
fb5ffb0e JZ |
146 | va_end(args); |
147 | } | |
148 | } | |
149 | EXPORT_SYMBOL(__quota_error); | |
150 | ||
da8d1ba2 | 151 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 152 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 153 | #endif |
1da177e4 LT |
154 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
155 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
156 | ||
157 | /* SLAB cache for dquot structures */ | |
e18b890b | 158 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
159 | |
160 | int register_quota_format(struct quota_format_type *fmt) | |
161 | { | |
162 | spin_lock(&dq_list_lock); | |
163 | fmt->qf_next = quota_formats; | |
164 | quota_formats = fmt; | |
165 | spin_unlock(&dq_list_lock); | |
166 | return 0; | |
167 | } | |
08d0350c | 168 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
169 | |
170 | void unregister_quota_format(struct quota_format_type *fmt) | |
171 | { | |
172 | struct quota_format_type **actqf; | |
173 | ||
174 | spin_lock(&dq_list_lock); | |
268157ba JK |
175 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
176 | actqf = &(*actqf)->qf_next) | |
177 | ; | |
1da177e4 LT |
178 | if (*actqf) |
179 | *actqf = (*actqf)->qf_next; | |
180 | spin_unlock(&dq_list_lock); | |
181 | } | |
08d0350c | 182 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
183 | |
184 | static struct quota_format_type *find_quota_format(int id) | |
185 | { | |
186 | struct quota_format_type *actqf; | |
187 | ||
188 | spin_lock(&dq_list_lock); | |
268157ba JK |
189 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
190 | actqf = actqf->qf_next) | |
191 | ; | |
1da177e4 LT |
192 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
193 | int qm; | |
194 | ||
195 | spin_unlock(&dq_list_lock); | |
196 | ||
268157ba JK |
197 | for (qm = 0; module_names[qm].qm_fmt_id && |
198 | module_names[qm].qm_fmt_id != id; qm++) | |
199 | ; | |
200 | if (!module_names[qm].qm_fmt_id || | |
201 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
202 | return NULL; |
203 | ||
204 | spin_lock(&dq_list_lock); | |
268157ba JK |
205 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
206 | actqf = actqf->qf_next) | |
207 | ; | |
1da177e4 LT |
208 | if (actqf && !try_module_get(actqf->qf_owner)) |
209 | actqf = NULL; | |
210 | } | |
211 | spin_unlock(&dq_list_lock); | |
212 | return actqf; | |
213 | } | |
214 | ||
215 | static void put_quota_format(struct quota_format_type *fmt) | |
216 | { | |
217 | module_put(fmt->qf_owner); | |
218 | } | |
219 | ||
220 | /* | |
221 | * Dquot List Management: | |
222 | * The quota code uses three lists for dquot management: the inuse_list, | |
223 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
224 | * on all three lists, depending on its current state. | |
225 | * | |
226 | * All dquots are placed to the end of inuse_list when first created, and this | |
227 | * list is used for invalidate operation, which must look at every dquot. | |
228 | * | |
229 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
230 | * and this list is searched whenever we need an available dquot. Dquots are | |
231 | * removed from the list as soon as they are used again, and | |
232 | * dqstats.free_dquots gives the number of dquots on the list. When | |
233 | * dquot is invalidated it's completely released from memory. | |
234 | * | |
235 | * Dquots with a specific identity (device, type and id) are placed on | |
236 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
237 | * mechanism to locate a specific dquot. | |
238 | */ | |
239 | ||
240 | static LIST_HEAD(inuse_list); | |
241 | static LIST_HEAD(free_dquots); | |
242 | static unsigned int dq_hash_bits, dq_hash_mask; | |
243 | static struct hlist_head *dquot_hash; | |
244 | ||
245 | struct dqstats dqstats; | |
08d0350c | 246 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 247 | |
0a5a9c72 | 248 | static qsize_t inode_get_rsv_space(struct inode *inode); |
6184fc0b | 249 | static int __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 250 | |
1da177e4 | 251 | static inline unsigned int |
1a06d420 | 252 | hashfn(const struct super_block *sb, struct kqid qid) |
1da177e4 | 253 | { |
1a06d420 EB |
254 | unsigned int id = from_kqid(&init_user_ns, qid); |
255 | int type = qid.type; | |
1da177e4 LT |
256 | unsigned long tmp; |
257 | ||
258 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
259 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Following list functions expect dq_list_lock to be held | |
264 | */ | |
265 | static inline void insert_dquot_hash(struct dquot *dquot) | |
266 | { | |
268157ba | 267 | struct hlist_head *head; |
1a06d420 | 268 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); |
1da177e4 LT |
269 | hlist_add_head(&dquot->dq_hash, head); |
270 | } | |
271 | ||
272 | static inline void remove_dquot_hash(struct dquot *dquot) | |
273 | { | |
274 | hlist_del_init(&dquot->dq_hash); | |
275 | } | |
276 | ||
7a2435d8 | 277 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
1a06d420 | 278 | struct kqid qid) |
1da177e4 LT |
279 | { |
280 | struct hlist_node *node; | |
281 | struct dquot *dquot; | |
282 | ||
283 | hlist_for_each (node, dquot_hash+hashent) { | |
284 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
4c376dca | 285 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 LT |
286 | return dquot; |
287 | } | |
dd6f3c6d | 288 | return NULL; |
1da177e4 LT |
289 | } |
290 | ||
291 | /* Add a dquot to the tail of the free list */ | |
292 | static inline void put_dquot_last(struct dquot *dquot) | |
293 | { | |
8e13059a | 294 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 295 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
296 | } |
297 | ||
298 | static inline void remove_free_dquot(struct dquot *dquot) | |
299 | { | |
300 | if (list_empty(&dquot->dq_free)) | |
301 | return; | |
302 | list_del_init(&dquot->dq_free); | |
dde95888 | 303 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
304 | } |
305 | ||
306 | static inline void put_inuse(struct dquot *dquot) | |
307 | { | |
308 | /* We add to the back of inuse list so we don't have to restart | |
309 | * when traversing this list and we block */ | |
8e13059a | 310 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 311 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
312 | } |
313 | ||
314 | static inline void remove_inuse(struct dquot *dquot) | |
315 | { | |
dde95888 | 316 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
317 | list_del(&dquot->dq_inuse); |
318 | } | |
319 | /* | |
320 | * End of list functions needing dq_list_lock | |
321 | */ | |
322 | ||
323 | static void wait_on_dquot(struct dquot *dquot) | |
324 | { | |
d3be915f IM |
325 | mutex_lock(&dquot->dq_lock); |
326 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
327 | } |
328 | ||
03f6e92b JK |
329 | static inline int dquot_dirty(struct dquot *dquot) |
330 | { | |
331 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
332 | } | |
333 | ||
334 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
335 | { | |
336 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
337 | } | |
1da177e4 | 338 | |
eabf290d | 339 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
340 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
341 | { | |
eabf290d DM |
342 | int ret = 1; |
343 | ||
4580b30e JK |
344 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
345 | return 0; | |
346 | ||
834057bf JK |
347 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
348 | return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); | |
349 | ||
eabf290d DM |
350 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ |
351 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
352 | return 1; | |
353 | ||
1da177e4 | 354 | spin_lock(&dq_list_lock); |
eabf290d | 355 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 356 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 357 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
358 | ret = 0; |
359 | } | |
1da177e4 | 360 | spin_unlock(&dq_list_lock); |
eabf290d | 361 | return ret; |
1da177e4 | 362 | } |
08d0350c | 363 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 364 | |
dc52dd3a DM |
365 | /* Dirtify all the dquots - this can block when journalling */ |
366 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
367 | { | |
368 | int ret, err, cnt; | |
369 | ||
370 | ret = err = 0; | |
371 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
372 | if (dquot[cnt]) | |
373 | /* Even in case of error we have to continue */ | |
374 | ret = mark_dquot_dirty(dquot[cnt]); | |
375 | if (!err) | |
376 | err = ret; | |
377 | } | |
378 | return err; | |
379 | } | |
380 | ||
381 | static inline void dqput_all(struct dquot **dquot) | |
382 | { | |
383 | unsigned int cnt; | |
384 | ||
385 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
386 | dqput(dquot[cnt]); | |
387 | } | |
388 | ||
1da177e4 LT |
389 | static inline int clear_dquot_dirty(struct dquot *dquot) |
390 | { | |
834057bf JK |
391 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
392 | return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); | |
393 | ||
1e0b7cb0 JK |
394 | spin_lock(&dq_list_lock); |
395 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { | |
396 | spin_unlock(&dq_list_lock); | |
1da177e4 | 397 | return 0; |
1e0b7cb0 | 398 | } |
1da177e4 | 399 | list_del_init(&dquot->dq_dirty); |
1e0b7cb0 | 400 | spin_unlock(&dq_list_lock); |
1da177e4 LT |
401 | return 1; |
402 | } | |
403 | ||
404 | void mark_info_dirty(struct super_block *sb, int type) | |
405 | { | |
15512377 JK |
406 | spin_lock(&dq_data_lock); |
407 | sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; | |
408 | spin_unlock(&dq_data_lock); | |
1da177e4 LT |
409 | } |
410 | EXPORT_SYMBOL(mark_info_dirty); | |
411 | ||
412 | /* | |
413 | * Read dquot from disk and alloc space for it | |
414 | */ | |
415 | ||
416 | int dquot_acquire(struct dquot *dquot) | |
417 | { | |
418 | int ret = 0, ret2 = 0; | |
419 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
420 | ||
d3be915f | 421 | mutex_lock(&dquot->dq_lock); |
e342e38d | 422 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
4c376dca | 423 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
1da177e4 LT |
424 | if (ret < 0) |
425 | goto out_iolock; | |
044c9b67 JK |
426 | /* Make sure flags update is visible after dquot has been filled */ |
427 | smp_mb__before_atomic(); | |
1da177e4 LT |
428 | set_bit(DQ_READ_B, &dquot->dq_flags); |
429 | /* Instantiate dquot if needed */ | |
430 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 431 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 432 | /* Write the info if needed */ |
4c376dca EB |
433 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
434 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
435 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 436 | } |
1da177e4 LT |
437 | if (ret < 0) |
438 | goto out_iolock; | |
439 | if (ret2 < 0) { | |
440 | ret = ret2; | |
441 | goto out_iolock; | |
442 | } | |
443 | } | |
044c9b67 JK |
444 | /* |
445 | * Make sure flags update is visible after on-disk struct has been | |
446 | * allocated. Paired with smp_rmb() in dqget(). | |
447 | */ | |
448 | smp_mb__before_atomic(); | |
1da177e4 LT |
449 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
450 | out_iolock: | |
d3be915f | 451 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
452 | return ret; |
453 | } | |
08d0350c | 454 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
455 | |
456 | /* | |
457 | * Write dquot to disk | |
458 | */ | |
459 | int dquot_commit(struct dquot *dquot) | |
460 | { | |
b03f2456 | 461 | int ret = 0; |
1da177e4 LT |
462 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
463 | ||
5e8cb9b6 | 464 | mutex_lock(&dquot->dq_lock); |
1e0b7cb0 | 465 | if (!clear_dquot_dirty(dquot)) |
5e8cb9b6 | 466 | goto out_lock; |
1da177e4 LT |
467 | /* Inactive dquot can be only if there was error during read/init |
468 | * => we have better not writing it */ | |
8fc32c2b | 469 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 470 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
8fc32c2b | 471 | else |
b03f2456 | 472 | ret = -EIO; |
5e8cb9b6 JK |
473 | out_lock: |
474 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
475 | return ret; |
476 | } | |
08d0350c | 477 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
478 | |
479 | /* | |
480 | * Release dquot | |
481 | */ | |
482 | int dquot_release(struct dquot *dquot) | |
483 | { | |
484 | int ret = 0, ret2 = 0; | |
485 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
486 | ||
d3be915f | 487 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
488 | /* Check whether we are not racing with some other dqget() */ |
489 | if (atomic_read(&dquot->dq_count) > 1) | |
490 | goto out_dqlock; | |
4c376dca EB |
491 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
492 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 493 | /* Write the info */ |
4c376dca EB |
494 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
495 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
496 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 497 | } |
1da177e4 LT |
498 | if (ret >= 0) |
499 | ret = ret2; | |
500 | } | |
501 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
1da177e4 | 502 | out_dqlock: |
d3be915f | 503 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
504 | return ret; |
505 | } | |
08d0350c | 506 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 507 | |
7d9056ba | 508 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
509 | { |
510 | kmem_cache_free(dquot_cachep, dquot); | |
511 | } | |
7d9056ba | 512 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
513 | |
514 | static inline void do_destroy_dquot(struct dquot *dquot) | |
515 | { | |
516 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
517 | } | |
518 | ||
1da177e4 LT |
519 | /* Invalidate all dquots on the list. Note that this function is called after |
520 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
521 | * quota users. There can still be some users of quotas due to inodes being |
522 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 523 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 524 | */ |
1da177e4 LT |
525 | static void invalidate_dquots(struct super_block *sb, int type) |
526 | { | |
c33ed271 | 527 | struct dquot *dquot, *tmp; |
1da177e4 | 528 | |
6362e4d4 | 529 | restart: |
1da177e4 | 530 | spin_lock(&dq_list_lock); |
c33ed271 | 531 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
532 | if (dquot->dq_sb != sb) |
533 | continue; | |
4c376dca | 534 | if (dquot->dq_id.type != type) |
1da177e4 | 535 | continue; |
6362e4d4 JK |
536 | /* Wait for dquot users */ |
537 | if (atomic_read(&dquot->dq_count)) { | |
9f985cb6 | 538 | dqgrab(dquot); |
6362e4d4 | 539 | spin_unlock(&dq_list_lock); |
503330f3 JK |
540 | /* |
541 | * Once dqput() wakes us up, we know it's time to free | |
6362e4d4 JK |
542 | * the dquot. |
543 | * IMPORTANT: we rely on the fact that there is always | |
544 | * at most one process waiting for dquot to free. | |
545 | * Otherwise dq_count would be > 1 and we would never | |
546 | * wake up. | |
547 | */ | |
503330f3 JK |
548 | wait_event(dquot_ref_wq, |
549 | atomic_read(&dquot->dq_count) == 1); | |
6362e4d4 JK |
550 | dqput(dquot); |
551 | /* At this moment dquot() need not exist (it could be | |
552 | * reclaimed by prune_dqcache(). Hence we must | |
553 | * restart. */ | |
554 | goto restart; | |
555 | } | |
556 | /* | |
557 | * Quota now has no users and it has been written on last | |
558 | * dqput() | |
559 | */ | |
1da177e4 LT |
560 | remove_dquot_hash(dquot); |
561 | remove_free_dquot(dquot); | |
562 | remove_inuse(dquot); | |
74f783af | 563 | do_destroy_dquot(dquot); |
1da177e4 LT |
564 | } |
565 | spin_unlock(&dq_list_lock); | |
566 | } | |
567 | ||
12c77527 JK |
568 | /* Call callback for every active dquot on given filesystem */ |
569 | int dquot_scan_active(struct super_block *sb, | |
570 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
571 | unsigned long priv) | |
572 | { | |
573 | struct dquot *dquot, *old_dquot = NULL; | |
574 | int ret = 0; | |
575 | ||
ee1ac541 JK |
576 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
577 | ||
12c77527 JK |
578 | spin_lock(&dq_list_lock); |
579 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
580 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
581 | continue; | |
582 | if (dquot->dq_sb != sb) | |
583 | continue; | |
584 | /* Now we have active dquot so we can just increase use count */ | |
585 | atomic_inc(&dquot->dq_count); | |
12c77527 | 586 | spin_unlock(&dq_list_lock); |
dde95888 | 587 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
588 | dqput(old_dquot); |
589 | old_dquot = dquot; | |
1362f4ea JK |
590 | /* |
591 | * ->release_dquot() can be racing with us. Our reference | |
592 | * protects us from new calls to it so just wait for any | |
593 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
594 | */ | |
595 | wait_on_dquot(dquot); | |
596 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
597 | ret = fn(dquot, priv); | |
598 | if (ret < 0) | |
599 | goto out; | |
600 | } | |
12c77527 JK |
601 | spin_lock(&dq_list_lock); |
602 | /* We are safe to continue now because our dquot could not | |
603 | * be moved out of the inuse list while we hold the reference */ | |
604 | } | |
605 | spin_unlock(&dq_list_lock); | |
606 | out: | |
607 | dqput(old_dquot); | |
12c77527 JK |
608 | return ret; |
609 | } | |
08d0350c | 610 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 611 | |
ceed1723 JK |
612 | /* Write all dquot structures to quota files */ |
613 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
614 | { |
615 | struct list_head *dirty; | |
616 | struct dquot *dquot; | |
617 | struct quota_info *dqopt = sb_dqopt(sb); | |
618 | int cnt; | |
ceed1723 | 619 | int err, ret = 0; |
1da177e4 | 620 | |
9d1ccbe7 JK |
621 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
622 | ||
1da177e4 LT |
623 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
624 | if (type != -1 && cnt != type) | |
625 | continue; | |
f55abc0f | 626 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
627 | continue; |
628 | spin_lock(&dq_list_lock); | |
629 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
630 | while (!list_empty(dirty)) { | |
268157ba JK |
631 | dquot = list_first_entry(dirty, struct dquot, |
632 | dq_dirty); | |
4580b30e JK |
633 | |
634 | WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); | |
635 | ||
1da177e4 LT |
636 | /* Now we have active dquot from which someone is |
637 | * holding reference so we can safely just increase | |
638 | * use count */ | |
9f985cb6 | 639 | dqgrab(dquot); |
1da177e4 | 640 | spin_unlock(&dq_list_lock); |
dde95888 | 641 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 JK |
642 | err = sb->dq_op->write_dquot(dquot); |
643 | if (!ret && err) | |
474d2605 | 644 | ret = err; |
1da177e4 LT |
645 | dqput(dquot); |
646 | spin_lock(&dq_list_lock); | |
647 | } | |
648 | spin_unlock(&dq_list_lock); | |
649 | } | |
650 | ||
651 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
652 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
653 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 654 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 655 | dqstats_inc(DQST_SYNCS); |
1da177e4 | 656 | |
ceed1723 JK |
657 | return ret; |
658 | } | |
659 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
660 | ||
661 | /* Write all dquot structures to disk and make them visible from userspace */ | |
662 | int dquot_quota_sync(struct super_block *sb, int type) | |
663 | { | |
664 | struct quota_info *dqopt = sb_dqopt(sb); | |
665 | int cnt; | |
666 | int ret; | |
667 | ||
668 | ret = dquot_writeback_dquots(sb, type); | |
669 | if (ret) | |
670 | return ret; | |
671 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
672 | return 0; |
673 | ||
674 | /* This is not very clever (and fast) but currently I don't know about | |
675 | * any other simple way of getting quota data to disk and we must get | |
676 | * them there for userspace to be visible... */ | |
677 | if (sb->s_op->sync_fs) | |
678 | sb->s_op->sync_fs(sb, 1); | |
679 | sync_blockdev(sb->s_bdev); | |
680 | ||
681 | /* | |
682 | * Now when everything is written we can discard the pagecache so | |
683 | * that userspace sees the changes. | |
684 | */ | |
5fb324ad CH |
685 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
686 | if (type != -1 && cnt != type) | |
687 | continue; | |
688 | if (!sb_has_quota_active(sb, cnt)) | |
689 | continue; | |
5955102c | 690 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 691 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 692 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 693 | } |
5fb324ad | 694 | |
1da177e4 LT |
695 | return 0; |
696 | } | |
287a8095 | 697 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 698 | |
1ab6c499 DC |
699 | static unsigned long |
700 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 LT |
701 | { |
702 | struct list_head *head; | |
703 | struct dquot *dquot; | |
1ab6c499 | 704 | unsigned long freed = 0; |
1da177e4 | 705 | |
d68aab6b | 706 | spin_lock(&dq_list_lock); |
1da177e4 | 707 | head = free_dquots.prev; |
1ab6c499 | 708 | while (head != &free_dquots && sc->nr_to_scan) { |
1da177e4 LT |
709 | dquot = list_entry(head, struct dquot, dq_free); |
710 | remove_dquot_hash(dquot); | |
711 | remove_free_dquot(dquot); | |
712 | remove_inuse(dquot); | |
74f783af | 713 | do_destroy_dquot(dquot); |
1ab6c499 DC |
714 | sc->nr_to_scan--; |
715 | freed++; | |
1da177e4 LT |
716 | head = free_dquots.prev; |
717 | } | |
d68aab6b | 718 | spin_unlock(&dq_list_lock); |
1ab6c499 | 719 | return freed; |
1da177e4 LT |
720 | } |
721 | ||
1ab6c499 DC |
722 | static unsigned long |
723 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 724 | { |
55f841ce GC |
725 | return vfs_pressure_ratio( |
726 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
727 | } |
728 | ||
8e1f936b | 729 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
730 | .count_objects = dqcache_shrink_count, |
731 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
732 | .seeks = DEFAULT_SEEKS, |
733 | }; | |
734 | ||
1da177e4 LT |
735 | /* |
736 | * Put reference to dquot | |
1da177e4 | 737 | */ |
3d9ea253 | 738 | void dqput(struct dquot *dquot) |
1da177e4 | 739 | { |
b48d3805 JK |
740 | int ret; |
741 | ||
1da177e4 LT |
742 | if (!dquot) |
743 | return; | |
62af9b52 | 744 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 745 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 746 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
747 | quotatypes[dquot->dq_id.type], |
748 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
749 | BUG(); |
750 | } | |
751 | #endif | |
dde95888 | 752 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
753 | we_slept: |
754 | spin_lock(&dq_list_lock); | |
755 | if (atomic_read(&dquot->dq_count) > 1) { | |
756 | /* We have more than one user... nothing to do */ | |
757 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 758 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 759 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 | 760 | atomic_read(&dquot->dq_count) == 1) |
503330f3 | 761 | wake_up(&dquot_ref_wq); |
1da177e4 LT |
762 | spin_unlock(&dq_list_lock); |
763 | return; | |
764 | } | |
765 | /* Need to release dquot? */ | |
4580b30e | 766 | if (dquot_dirty(dquot)) { |
1da177e4 LT |
767 | spin_unlock(&dq_list_lock); |
768 | /* Commit dquot before releasing */ | |
b48d3805 JK |
769 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
770 | if (ret < 0) { | |
fb5ffb0e JZ |
771 | quota_error(dquot->dq_sb, "Can't write quota structure" |
772 | " (error %d). Quota may get out of sync!", | |
773 | ret); | |
b48d3805 JK |
774 | /* |
775 | * We clear dirty bit anyway, so that we avoid | |
776 | * infinite loop here | |
777 | */ | |
b48d3805 | 778 | clear_dquot_dirty(dquot); |
b48d3805 | 779 | } |
1da177e4 LT |
780 | goto we_slept; |
781 | } | |
1da177e4 LT |
782 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
783 | spin_unlock(&dq_list_lock); | |
784 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
785 | goto we_slept; | |
786 | } | |
787 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 788 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 789 | /* sanity check */ |
8abf6a47 | 790 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
791 | #endif |
792 | put_dquot_last(dquot); | |
793 | spin_unlock(&dq_list_lock); | |
794 | } | |
08d0350c | 795 | EXPORT_SYMBOL(dqput); |
1da177e4 | 796 | |
7d9056ba | 797 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
798 | { |
799 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
800 | } | |
7d9056ba | 801 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 802 | |
1da177e4 LT |
803 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
804 | { | |
805 | struct dquot *dquot; | |
806 | ||
74f783af | 807 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 808 | if(!dquot) |
dd6f3c6d | 809 | return NULL; |
1da177e4 | 810 | |
d3be915f | 811 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
812 | INIT_LIST_HEAD(&dquot->dq_free); |
813 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
814 | INIT_HLIST_NODE(&dquot->dq_hash); | |
815 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
816 | dquot->dq_sb = sb; | |
1a06d420 | 817 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 LT |
818 | atomic_set(&dquot->dq_count, 1); |
819 | ||
820 | return dquot; | |
821 | } | |
822 | ||
823 | /* | |
824 | * Get reference to dquot | |
cc33412f JK |
825 | * |
826 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
827 | * destroying our dquot by: | |
828 | * a) checking for quota flags under dq_list_lock and | |
829 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 830 | */ |
aca645a6 | 831 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 832 | { |
1a06d420 | 833 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 834 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 835 | |
d49d3762 EB |
836 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
837 | return ERR_PTR(-EINVAL); | |
838 | ||
1a06d420 | 839 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 840 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
841 | we_slept: |
842 | spin_lock(&dq_list_lock); | |
cc33412f | 843 | spin_lock(&dq_state_lock); |
1a06d420 | 844 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
845 | spin_unlock(&dq_state_lock); |
846 | spin_unlock(&dq_list_lock); | |
6184fc0b | 847 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
848 | goto out; |
849 | } | |
850 | spin_unlock(&dq_state_lock); | |
851 | ||
1a06d420 | 852 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
853 | if (!dquot) { |
854 | if (!empty) { | |
1da177e4 | 855 | spin_unlock(&dq_list_lock); |
1a06d420 | 856 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 857 | if (!empty) |
1da177e4 LT |
858 | schedule(); /* Try to wait for a moment... */ |
859 | goto we_slept; | |
860 | } | |
861 | dquot = empty; | |
dd6f3c6d | 862 | empty = NULL; |
4c376dca | 863 | dquot->dq_id = qid; |
1da177e4 LT |
864 | /* all dquots go on the inuse_list */ |
865 | put_inuse(dquot); | |
866 | /* hash it first so it can be found */ | |
867 | insert_dquot_hash(dquot); | |
1da177e4 | 868 | spin_unlock(&dq_list_lock); |
dde95888 | 869 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
870 | } else { |
871 | if (!atomic_read(&dquot->dq_count)) | |
872 | remove_free_dquot(dquot); | |
873 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 874 | spin_unlock(&dq_list_lock); |
dde95888 DM |
875 | dqstats_inc(DQST_CACHE_HITS); |
876 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 877 | } |
268157ba JK |
878 | /* Wait for dq_lock - after this we know that either dquot_release() is |
879 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 880 | wait_on_dquot(dquot); |
268157ba | 881 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
882 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
883 | int err; | |
884 | ||
885 | err = sb->dq_op->acquire_dquot(dquot); | |
886 | if (err < 0) { | |
887 | dqput(dquot); | |
888 | dquot = ERR_PTR(err); | |
889 | goto out; | |
890 | } | |
1da177e4 | 891 | } |
044c9b67 JK |
892 | /* |
893 | * Make sure following reads see filled structure - paired with | |
894 | * smp_mb__before_atomic() in dquot_acquire(). | |
895 | */ | |
896 | smp_rmb(); | |
62af9b52 | 897 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 898 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 899 | #endif |
cc33412f JK |
900 | out: |
901 | if (empty) | |
902 | do_destroy_dquot(empty); | |
1da177e4 LT |
903 | |
904 | return dquot; | |
905 | } | |
08d0350c | 906 | EXPORT_SYMBOL(dqget); |
1da177e4 | 907 | |
2d0fa467 JK |
908 | static inline struct dquot **i_dquot(struct inode *inode) |
909 | { | |
2d0fa467 JK |
910 | return inode->i_sb->s_op->get_dquots(inode); |
911 | } | |
912 | ||
1da177e4 LT |
913 | static int dqinit_needed(struct inode *inode, int type) |
914 | { | |
5bcd3b6f | 915 | struct dquot * const *dquots; |
1da177e4 LT |
916 | int cnt; |
917 | ||
918 | if (IS_NOQUOTA(inode)) | |
919 | return 0; | |
5bcd3b6f KK |
920 | |
921 | dquots = i_dquot(inode); | |
1da177e4 | 922 | if (type != -1) |
5bcd3b6f | 923 | return !dquots[type]; |
1da177e4 | 924 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 925 | if (!dquots[cnt]) |
1da177e4 LT |
926 | return 1; |
927 | return 0; | |
928 | } | |
929 | ||
c3b00446 | 930 | /* This routine is guarded by s_umount semaphore */ |
1da177e4 LT |
931 | static void add_dquot_ref(struct super_block *sb, int type) |
932 | { | |
941d2380 | 933 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 934 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 935 | int reserved = 0; |
4c5e6c0e | 936 | #endif |
1da177e4 | 937 | |
74278da9 | 938 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 939 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
940 | spin_lock(&inode->i_lock); |
941 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
942 | !atomic_read(&inode->i_writecount) || | |
943 | !dqinit_needed(inode, type)) { | |
944 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 945 | continue; |
250df6ed | 946 | } |
d003fb70 | 947 | __iget(inode); |
250df6ed | 948 | spin_unlock(&inode->i_lock); |
74278da9 | 949 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 950 | |
d7e97117 JK |
951 | #ifdef CONFIG_QUOTA_DEBUG |
952 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
953 | reserved = 1; | |
954 | #endif | |
941d2380 | 955 | iput(old_inode); |
871a2931 | 956 | __dquot_initialize(inode, type); |
55fa6091 DC |
957 | |
958 | /* | |
959 | * We hold a reference to 'inode' so it couldn't have been | |
960 | * removed from s_inodes list while we dropped the | |
74278da9 | 961 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 962 | * holding the last reference and we cannot iput it under |
74278da9 | 963 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
964 | * later. |
965 | */ | |
941d2380 | 966 | old_inode = inode; |
74278da9 | 967 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 968 | } |
74278da9 | 969 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 970 | iput(old_inode); |
0a5a9c72 | 971 | |
62af9b52 | 972 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 973 | if (reserved) { |
fb5ffb0e JZ |
974 | quota_error(sb, "Writes happened before quota was turned on " |
975 | "thus quota information is probably inconsistent. " | |
976 | "Please run quotacheck(8)"); | |
0a5a9c72 | 977 | } |
4c5e6c0e | 978 | #endif |
1da177e4 LT |
979 | } |
980 | ||
268157ba JK |
981 | /* |
982 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 983 | * if we have the last reference to dquot |
268157ba | 984 | */ |
9eb6463f NY |
985 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
986 | struct list_head *tofree_head) | |
1da177e4 | 987 | { |
5bcd3b6f KK |
988 | struct dquot **dquots = i_dquot(inode); |
989 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 990 | |
9eb6463f NY |
991 | if (!dquot) |
992 | return; | |
993 | ||
5bcd3b6f | 994 | dquots[type] = NULL; |
9eb6463f NY |
995 | if (list_empty(&dquot->dq_free)) { |
996 | /* | |
997 | * The inode still has reference to dquot so it can't be in the | |
998 | * free list | |
999 | */ | |
1000 | spin_lock(&dq_list_lock); | |
1001 | list_add(&dquot->dq_free, tofree_head); | |
1002 | spin_unlock(&dq_list_lock); | |
1003 | } else { | |
1004 | /* | |
1005 | * Dquot is already in a list to put so we won't drop the last | |
1006 | * reference here. | |
1007 | */ | |
1008 | dqput(dquot); | |
1da177e4 | 1009 | } |
1da177e4 LT |
1010 | } |
1011 | ||
268157ba JK |
1012 | /* |
1013 | * Free list of dquots | |
1014 | * Dquots are removed from inodes and no new references can be got so we are | |
1015 | * the only ones holding reference | |
1016 | */ | |
1da177e4 LT |
1017 | static void put_dquot_list(struct list_head *tofree_head) |
1018 | { | |
1019 | struct list_head *act_head; | |
1020 | struct dquot *dquot; | |
1021 | ||
1022 | act_head = tofree_head->next; | |
1da177e4 LT |
1023 | while (act_head != tofree_head) { |
1024 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1025 | act_head = act_head->next; | |
268157ba JK |
1026 | /* Remove dquot from the list so we won't have problems... */ |
1027 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1028 | dqput(dquot); |
1029 | } | |
1030 | } | |
1031 | ||
fb58b731 CH |
1032 | static void remove_dquot_ref(struct super_block *sb, int type, |
1033 | struct list_head *tofree_head) | |
1034 | { | |
1035 | struct inode *inode; | |
7af9cce8 | 1036 | int reserved = 0; |
fb58b731 | 1037 | |
74278da9 | 1038 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1039 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1040 | /* |
1041 | * We have to scan also I_NEW inodes because they can already | |
1042 | * have quota pointer initialized. Luckily, we need to touch | |
1043 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1044 | * (dq_data_lock). |
aabb8fdb | 1045 | */ |
b9ba6f94 | 1046 | spin_lock(&dq_data_lock); |
7af9cce8 DM |
1047 | if (!IS_NOQUOTA(inode)) { |
1048 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1049 | reserved = 1; | |
fb58b731 | 1050 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1051 | } |
b9ba6f94 | 1052 | spin_unlock(&dq_data_lock); |
fb58b731 | 1053 | } |
74278da9 | 1054 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1055 | #ifdef CONFIG_QUOTA_DEBUG |
1056 | if (reserved) { | |
1057 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1058 | " was disabled thus quota information is probably " | |
1059 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1060 | } | |
1061 | #endif | |
fb58b731 CH |
1062 | } |
1063 | ||
1da177e4 LT |
1064 | /* Gather all references from inodes and drop them */ |
1065 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1066 | { | |
1067 | LIST_HEAD(tofree_head); | |
1068 | ||
fb58b731 | 1069 | if (sb->dq_op) { |
fb58b731 | 1070 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1071 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1072 | put_dquot_list(&tofree_head); |
1073 | } | |
1da177e4 LT |
1074 | } |
1075 | ||
12095460 | 1076 | static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 LT |
1077 | { |
1078 | dquot->dq_dqb.dqb_curinodes += number; | |
1079 | } | |
1080 | ||
1081 | static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) | |
1082 | { | |
1083 | dquot->dq_dqb.dqb_curspace += number; | |
1084 | } | |
1085 | ||
f18df228 MC |
1086 | static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) |
1087 | { | |
1088 | dquot->dq_dqb.dqb_rsvspace += number; | |
1089 | } | |
1090 | ||
740d9dcd MC |
1091 | /* |
1092 | * Claim reserved quota space | |
1093 | */ | |
0a5a9c72 | 1094 | static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) |
740d9dcd | 1095 | { |
0a5a9c72 JK |
1096 | if (dquot->dq_dqb.dqb_rsvspace < number) { |
1097 | WARN_ON_ONCE(1); | |
1098 | number = dquot->dq_dqb.dqb_rsvspace; | |
1099 | } | |
740d9dcd MC |
1100 | dquot->dq_dqb.dqb_curspace += number; |
1101 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1102 | } | |
1103 | ||
1c8924eb JK |
1104 | static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) |
1105 | { | |
1106 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) | |
1107 | number = dquot->dq_dqb.dqb_curspace; | |
1108 | dquot->dq_dqb.dqb_rsvspace += number; | |
1109 | dquot->dq_dqb.dqb_curspace -= number; | |
1110 | } | |
1111 | ||
740d9dcd MC |
1112 | static inline |
1113 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1114 | { | |
0a5a9c72 JK |
1115 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1116 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1117 | else { | |
1118 | WARN_ON_ONCE(1); | |
1119 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1120 | } | |
740d9dcd MC |
1121 | } |
1122 | ||
7a2435d8 | 1123 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1124 | { |
db49d2df JK |
1125 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1126 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1127 | dquot->dq_dqb.dqb_curinodes -= number; |
1128 | else | |
1129 | dquot->dq_dqb.dqb_curinodes = 0; | |
1130 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1131 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1132 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1133 | } | |
1134 | ||
7a2435d8 | 1135 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1136 | { |
db49d2df JK |
1137 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1138 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1139 | dquot->dq_dqb.dqb_curspace -= number; |
1140 | else | |
1141 | dquot->dq_dqb.dqb_curspace = 0; | |
12095460 | 1142 | if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
e008bb61 | 1143 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1144 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1145 | } | |
1146 | ||
bf097aaf JK |
1147 | struct dquot_warn { |
1148 | struct super_block *w_sb; | |
7b9c7321 | 1149 | struct kqid w_dq_id; |
bf097aaf JK |
1150 | short w_type; |
1151 | }; | |
1152 | ||
c525460e JK |
1153 | static int warning_issued(struct dquot *dquot, const int warntype) |
1154 | { | |
1155 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1156 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1157 | ((warntype == QUOTA_NL_IHARDWARN || | |
1158 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1159 | ||
1160 | if (!flag) | |
1161 | return 0; | |
1162 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1163 | } | |
1164 | ||
8e893469 | 1165 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1166 | static int flag_print_warnings = 1; |
1167 | ||
bf097aaf | 1168 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1169 | { |
1170 | if (!flag_print_warnings) | |
1171 | return 0; | |
1172 | ||
7b9c7321 | 1173 | switch (warn->w_dq_id.type) { |
1da177e4 | 1174 | case USRQUOTA: |
1a06d420 | 1175 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1176 | case GRPQUOTA: |
7b9c7321 | 1177 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1178 | case PRJQUOTA: |
1179 | return 1; | |
1da177e4 LT |
1180 | } |
1181 | return 0; | |
1182 | } | |
1183 | ||
1da177e4 | 1184 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1185 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1186 | { |
1187 | char *msg = NULL; | |
24ec839c | 1188 | struct tty_struct *tty; |
bf097aaf | 1189 | int warntype = warn->w_type; |
1da177e4 | 1190 | |
657d3bfa JK |
1191 | if (warntype == QUOTA_NL_IHARDBELOW || |
1192 | warntype == QUOTA_NL_ISOFTBELOW || | |
1193 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1194 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1195 | return; |
1196 | ||
24ec839c PZ |
1197 | tty = get_current_tty(); |
1198 | if (!tty) | |
452a00d2 | 1199 | return; |
bf097aaf | 1200 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1201 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1202 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1203 | else |
24ec839c | 1204 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1205 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1206 | switch (warntype) { |
8e893469 | 1207 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1208 | msg = " file limit reached.\r\n"; |
1209 | break; | |
8e893469 | 1210 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1211 | msg = " file quota exceeded too long.\r\n"; |
1212 | break; | |
8e893469 | 1213 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1214 | msg = " file quota exceeded.\r\n"; |
1215 | break; | |
8e893469 | 1216 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1217 | msg = " block limit reached.\r\n"; |
1218 | break; | |
8e893469 | 1219 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1220 | msg = " block quota exceeded too long.\r\n"; |
1221 | break; | |
8e893469 | 1222 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1223 | msg = " block quota exceeded.\r\n"; |
1224 | break; | |
1225 | } | |
24ec839c | 1226 | tty_write_message(tty, msg); |
452a00d2 | 1227 | tty_kref_put(tty); |
1da177e4 | 1228 | } |
8e893469 JK |
1229 | #endif |
1230 | ||
bf097aaf JK |
1231 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1232 | int warntype) | |
1233 | { | |
1234 | if (warning_issued(dquot, warntype)) | |
1235 | return; | |
1236 | warn->w_type = warntype; | |
1237 | warn->w_sb = dquot->dq_sb; | |
1238 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1239 | } |
1240 | ||
f18df228 MC |
1241 | /* |
1242 | * Write warnings to the console and send warning messages over netlink. | |
1243 | * | |
bf097aaf | 1244 | * Note that this function can call into tty and networking code. |
f18df228 | 1245 | */ |
bf097aaf | 1246 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1247 | { |
1248 | int i; | |
1249 | ||
86e931a3 | 1250 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1251 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1252 | continue; | |
8e893469 | 1253 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1254 | print_warning(&warn[i]); |
8e893469 | 1255 | #endif |
7b9c7321 | 1256 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1257 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1258 | } |
1da177e4 LT |
1259 | } |
1260 | ||
7a2435d8 | 1261 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1262 | { |
4c376dca | 1263 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1264 | |
1265 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1266 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1267 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1268 | } |
1269 | ||
1270 | /* needs dq_data_lock */ | |
bf097aaf JK |
1271 | static int check_idq(struct dquot *dquot, qsize_t inodes, |
1272 | struct dquot_warn *warn) | |
1da177e4 | 1273 | { |
268157ba JK |
1274 | qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; |
1275 | ||
4c376dca | 1276 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1277 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1278 | return 0; |
1da177e4 LT |
1279 | |
1280 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1281 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1282 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1283 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
efd8f0e6 | 1284 | return -EDQUOT; |
1da177e4 LT |
1285 | } |
1286 | ||
1287 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1288 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1289 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1290 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1291 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1292 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
efd8f0e6 | 1293 | return -EDQUOT; |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1297 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1298 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1299 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1300 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1301 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 LT |
1302 | } |
1303 | ||
efd8f0e6 | 1304 | return 0; |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | /* needs dq_data_lock */ | |
bf097aaf JK |
1308 | static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, |
1309 | struct dquot_warn *warn) | |
1da177e4 | 1310 | { |
f18df228 | 1311 | qsize_t tspace; |
268157ba | 1312 | struct super_block *sb = dquot->dq_sb; |
f18df228 | 1313 | |
4c376dca | 1314 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1315 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
efd8f0e6 | 1316 | return 0; |
1da177e4 | 1317 | |
f18df228 MC |
1318 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
1319 | + space; | |
1320 | ||
1da177e4 | 1321 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1322 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 LT |
1323 | !ignore_hardlimit(dquot)) { |
1324 | if (!prealloc) | |
bf097aaf | 1325 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
efd8f0e6 | 1326 | return -EDQUOT; |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1330 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1331 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1332 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 LT |
1333 | !ignore_hardlimit(dquot)) { |
1334 | if (!prealloc) | |
bf097aaf | 1335 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
efd8f0e6 | 1336 | return -EDQUOT; |
1da177e4 LT |
1337 | } |
1338 | ||
1339 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1340 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 LT |
1341 | dquot->dq_dqb.dqb_btime == 0) { |
1342 | if (!prealloc) { | |
bf097aaf | 1343 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1344 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1345 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
1da177e4 LT |
1346 | } |
1347 | else | |
1348 | /* | |
1349 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1350 | * be always printed | |
1351 | */ | |
efd8f0e6 | 1352 | return -EDQUOT; |
1da177e4 LT |
1353 | } |
1354 | ||
efd8f0e6 | 1355 | return 0; |
1da177e4 LT |
1356 | } |
1357 | ||
12095460 | 1358 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1359 | { |
268157ba JK |
1360 | qsize_t newinodes; |
1361 | ||
657d3bfa | 1362 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1363 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1364 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1365 | return QUOTA_NL_NOWARN; |
1366 | ||
268157ba JK |
1367 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1368 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1369 | return QUOTA_NL_ISOFTBELOW; |
1370 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1371 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1372 | return QUOTA_NL_IHARDBELOW; |
1373 | return QUOTA_NL_NOWARN; | |
1374 | } | |
1375 | ||
1376 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1377 | { | |
1378 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || | |
12095460 | 1379 | dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1380 | return QUOTA_NL_NOWARN; |
1381 | ||
12095460 | 1382 | if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1383 | return QUOTA_NL_BSOFTBELOW; |
12095460 JK |
1384 | if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && |
1385 | dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1386 | return QUOTA_NL_BHARDBELOW; |
1387 | return QUOTA_NL_NOWARN; | |
1388 | } | |
0a5a9c72 | 1389 | |
189eef59 CH |
1390 | static int dquot_active(const struct inode *inode) |
1391 | { | |
1392 | struct super_block *sb = inode->i_sb; | |
1393 | ||
1394 | if (IS_NOQUOTA(inode)) | |
1395 | return 0; | |
1396 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1397 | } | |
1398 | ||
1da177e4 | 1399 | /* |
871a2931 CH |
1400 | * Initialize quota pointers in inode |
1401 | * | |
871a2931 CH |
1402 | * It is better to call this function outside of any transaction as it |
1403 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1404 | */ |
6184fc0b | 1405 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1406 | { |
1ea06bec | 1407 | int cnt, init_needed = 0; |
ab73ef46 | 1408 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1409 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1410 | qsize_t rsv; |
6184fc0b | 1411 | int ret = 0; |
1da177e4 | 1412 | |
189eef59 | 1413 | if (!dquot_active(inode)) |
6184fc0b | 1414 | return 0; |
cc33412f | 1415 | |
5bcd3b6f KK |
1416 | dquots = i_dquot(inode); |
1417 | ||
cc33412f JK |
1418 | /* First get references to structures we might need. */ |
1419 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1420 | struct kqid qid; |
847aac64 LX |
1421 | kprojid_t projid; |
1422 | int rc; | |
6184fc0b | 1423 | struct dquot *dquot; |
847aac64 | 1424 | |
cc33412f JK |
1425 | if (type != -1 && cnt != type) |
1426 | continue; | |
1ea06bec NY |
1427 | /* |
1428 | * The i_dquot should have been initialized in most cases, | |
1429 | * we check it without locking here to avoid unnecessary | |
1430 | * dqget()/dqput() calls. | |
1431 | */ | |
5bcd3b6f | 1432 | if (dquots[cnt]) |
1ea06bec | 1433 | continue; |
847aac64 LX |
1434 | |
1435 | if (!sb_has_quota_active(sb, cnt)) | |
1436 | continue; | |
1437 | ||
1ea06bec NY |
1438 | init_needed = 1; |
1439 | ||
cc33412f JK |
1440 | switch (cnt) { |
1441 | case USRQUOTA: | |
aca645a6 | 1442 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1443 | break; |
1444 | case GRPQUOTA: | |
aca645a6 | 1445 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1446 | break; |
847aac64 LX |
1447 | case PRJQUOTA: |
1448 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1449 | if (rc) | |
1450 | continue; | |
1451 | qid = make_kqid_projid(projid); | |
1452 | break; | |
cc33412f | 1453 | } |
6184fc0b JK |
1454 | dquot = dqget(sb, qid); |
1455 | if (IS_ERR(dquot)) { | |
1456 | /* We raced with somebody turning quotas off... */ | |
1457 | if (PTR_ERR(dquot) != -ESRCH) { | |
1458 | ret = PTR_ERR(dquot); | |
1459 | goto out_put; | |
1460 | } | |
1461 | dquot = NULL; | |
1462 | } | |
1463 | got[cnt] = dquot; | |
cc33412f JK |
1464 | } |
1465 | ||
1ea06bec NY |
1466 | /* All required i_dquot has been initialized */ |
1467 | if (!init_needed) | |
6184fc0b | 1468 | return 0; |
1ea06bec | 1469 | |
b9ba6f94 | 1470 | spin_lock(&dq_data_lock); |
1da177e4 | 1471 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1472 | goto out_lock; |
1da177e4 LT |
1473 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1474 | if (type != -1 && cnt != type) | |
1475 | continue; | |
cc33412f JK |
1476 | /* Avoid races with quotaoff() */ |
1477 | if (!sb_has_quota_active(sb, cnt)) | |
1478 | continue; | |
4408ea41 JK |
1479 | /* We could race with quotaon or dqget() could have failed */ |
1480 | if (!got[cnt]) | |
1481 | continue; | |
5bcd3b6f KK |
1482 | if (!dquots[cnt]) { |
1483 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1484 | got[cnt] = NULL; |
0a5a9c72 JK |
1485 | /* |
1486 | * Make quota reservation system happy if someone | |
1487 | * did a write before quota was turned on | |
1488 | */ | |
1489 | rsv = inode_get_rsv_space(inode); | |
b9ba6f94 | 1490 | if (unlikely(rsv)) |
5bcd3b6f | 1491 | dquot_resv_space(dquots[cnt], rsv); |
1da177e4 LT |
1492 | } |
1493 | } | |
6184fc0b | 1494 | out_lock: |
b9ba6f94 | 1495 | spin_unlock(&dq_data_lock); |
6184fc0b | 1496 | out_put: |
cc33412f | 1497 | /* Drop unused references */ |
dc52dd3a | 1498 | dqput_all(got); |
6184fc0b JK |
1499 | |
1500 | return ret; | |
871a2931 CH |
1501 | } |
1502 | ||
6184fc0b | 1503 | int dquot_initialize(struct inode *inode) |
871a2931 | 1504 | { |
6184fc0b | 1505 | return __dquot_initialize(inode, -1); |
1da177e4 | 1506 | } |
08d0350c | 1507 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1508 | |
b8cb5a54 TE |
1509 | bool dquot_initialize_needed(struct inode *inode) |
1510 | { | |
1511 | struct dquot **dquots; | |
1512 | int i; | |
1513 | ||
1514 | if (!dquot_active(inode)) | |
1515 | return false; | |
1516 | ||
1517 | dquots = i_dquot(inode); | |
1518 | for (i = 0; i < MAXQUOTAS; i++) | |
1519 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1520 | return true; | |
1521 | return false; | |
1522 | } | |
1523 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1524 | ||
1da177e4 | 1525 | /* |
b9ba6f94 NY |
1526 | * Release all quotas referenced by inode. |
1527 | * | |
1528 | * This function only be called on inode free or converting | |
1529 | * a file to quota file, no other users for the i_dquot in | |
1530 | * both cases, so we needn't call synchronize_srcu() after | |
1531 | * clearing i_dquot. | |
1da177e4 | 1532 | */ |
9f754758 | 1533 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1534 | { |
1535 | int cnt; | |
5bcd3b6f | 1536 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1537 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1538 | |
b9ba6f94 | 1539 | spin_lock(&dq_data_lock); |
1da177e4 | 1540 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1541 | put[cnt] = dquots[cnt]; |
1542 | dquots[cnt] = NULL; | |
1da177e4 | 1543 | } |
b9ba6f94 | 1544 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1545 | dqput_all(put); |
1da177e4 LT |
1546 | } |
1547 | ||
9f754758 CH |
1548 | void dquot_drop(struct inode *inode) |
1549 | { | |
5bcd3b6f | 1550 | struct dquot * const *dquots; |
9f754758 CH |
1551 | int cnt; |
1552 | ||
1553 | if (IS_NOQUOTA(inode)) | |
1554 | return; | |
1555 | ||
1556 | /* | |
1557 | * Test before calling to rule out calls from proc and such | |
1558 | * where we are not allowed to block. Note that this is | |
1559 | * actually reliable test even without the lock - the caller | |
1560 | * must assure that nobody can come after the DQUOT_DROP and | |
1561 | * add quota pointers back anyway. | |
1562 | */ | |
5bcd3b6f | 1563 | dquots = i_dquot(inode); |
9f754758 | 1564 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1565 | if (dquots[cnt]) |
9f754758 CH |
1566 | break; |
1567 | } | |
1568 | ||
1569 | if (cnt < MAXQUOTAS) | |
1570 | __dquot_drop(inode); | |
1571 | } | |
1572 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1573 | |
fd8fbfc1 DM |
1574 | /* |
1575 | * inode_reserved_space is managed internally by quota, and protected by | |
1576 | * i_lock similar to i_blocks+i_bytes. | |
1577 | */ | |
1578 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1579 | { | |
1580 | /* Filesystem must explicitly define it's own method in order to use | |
1581 | * quota reservation interface */ | |
1582 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1583 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1584 | } | |
1585 | ||
c469070a | 1586 | void inode_add_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1587 | { |
1588 | spin_lock(&inode->i_lock); | |
1589 | *inode_reserved_space(inode) += number; | |
1590 | spin_unlock(&inode->i_lock); | |
1591 | } | |
c469070a | 1592 | EXPORT_SYMBOL(inode_add_rsv_space); |
fd8fbfc1 | 1593 | |
c469070a | 1594 | void inode_claim_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1595 | { |
1596 | spin_lock(&inode->i_lock); | |
1597 | *inode_reserved_space(inode) -= number; | |
1598 | __inode_add_bytes(inode, number); | |
1599 | spin_unlock(&inode->i_lock); | |
1600 | } | |
c469070a | 1601 | EXPORT_SYMBOL(inode_claim_rsv_space); |
fd8fbfc1 | 1602 | |
1c8924eb JK |
1603 | void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) |
1604 | { | |
1605 | spin_lock(&inode->i_lock); | |
1606 | *inode_reserved_space(inode) += number; | |
1607 | __inode_sub_bytes(inode, number); | |
1608 | spin_unlock(&inode->i_lock); | |
1609 | } | |
1610 | EXPORT_SYMBOL(inode_reclaim_rsv_space); | |
1611 | ||
c469070a | 1612 | void inode_sub_rsv_space(struct inode *inode, qsize_t number) |
fd8fbfc1 DM |
1613 | { |
1614 | spin_lock(&inode->i_lock); | |
1615 | *inode_reserved_space(inode) -= number; | |
1616 | spin_unlock(&inode->i_lock); | |
1617 | } | |
c469070a | 1618 | EXPORT_SYMBOL(inode_sub_rsv_space); |
fd8fbfc1 DM |
1619 | |
1620 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1621 | { | |
1622 | qsize_t ret; | |
05b5d898 JK |
1623 | |
1624 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1625 | return 0; | |
fd8fbfc1 DM |
1626 | spin_lock(&inode->i_lock); |
1627 | ret = *inode_reserved_space(inode); | |
1628 | spin_unlock(&inode->i_lock); | |
1629 | return ret; | |
1630 | } | |
1631 | ||
1632 | static void inode_incr_space(struct inode *inode, qsize_t number, | |
1633 | int reserve) | |
1634 | { | |
1635 | if (reserve) | |
1636 | inode_add_rsv_space(inode, number); | |
1637 | else | |
1638 | inode_add_bytes(inode, number); | |
1639 | } | |
1640 | ||
1641 | static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) | |
1642 | { | |
1643 | if (reserve) | |
1644 | inode_sub_rsv_space(inode, number); | |
1645 | else | |
1646 | inode_sub_bytes(inode, number); | |
1647 | } | |
1648 | ||
1da177e4 | 1649 | /* |
5dd4056d CH |
1650 | * This functions updates i_blocks+i_bytes fields and quota information |
1651 | * (together with appropriate checks). | |
1652 | * | |
1653 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1654 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1655 | * the current transaction so that dquot write and inode write go into the | |
1656 | * same transaction. | |
1da177e4 LT |
1657 | */ |
1658 | ||
1659 | /* | |
1660 | * This operation can block, but only after everything is updated | |
1661 | */ | |
56246f9a | 1662 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1663 | { |
b9ba6f94 | 1664 | int cnt, ret = 0, index; |
bf097aaf | 1665 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1666 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1667 | struct dquot **dquots; |
1da177e4 | 1668 | |
189eef59 | 1669 | if (!dquot_active(inode)) { |
fd8fbfc1 DM |
1670 | inode_incr_space(inode, number, reserve); |
1671 | goto out; | |
1672 | } | |
1673 | ||
1da177e4 | 1674 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1675 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1676 | |
5bcd3b6f | 1677 | dquots = i_dquot(inode); |
b9ba6f94 | 1678 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1679 | spin_lock(&dq_data_lock); |
1680 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1681 | if (!dquots[cnt]) |
1da177e4 | 1682 | continue; |
bf097aaf JK |
1683 | ret = check_bdq(dquots[cnt], number, |
1684 | !(flags & DQUOT_SPACE_WARN), &warn[cnt]); | |
1685 | if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { | |
fd8fbfc1 DM |
1686 | spin_unlock(&dq_data_lock); |
1687 | goto out_flush_warn; | |
f18df228 | 1688 | } |
1da177e4 LT |
1689 | } |
1690 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1691 | if (!dquots[cnt]) |
1da177e4 | 1692 | continue; |
f18df228 | 1693 | if (reserve) |
bf097aaf | 1694 | dquot_resv_space(dquots[cnt], number); |
f18df228 | 1695 | else |
bf097aaf | 1696 | dquot_incr_space(dquots[cnt], number); |
1da177e4 | 1697 | } |
fd8fbfc1 | 1698 | inode_incr_space(inode, number, reserve); |
1da177e4 | 1699 | spin_unlock(&dq_data_lock); |
f18df228 | 1700 | |
fd8fbfc1 DM |
1701 | if (reserve) |
1702 | goto out_flush_warn; | |
bf097aaf | 1703 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1704 | out_flush_warn: |
b9ba6f94 | 1705 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1706 | flush_warnings(warn); |
f18df228 MC |
1707 | out: |
1708 | return ret; | |
1709 | } | |
5dd4056d | 1710 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1711 | |
1712 | /* | |
1713 | * This operation can block, but only after everything is updated | |
1714 | */ | |
6bab3596 | 1715 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1716 | { |
b9ba6f94 | 1717 | int cnt, ret = 0, index; |
bf097aaf | 1718 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1719 | struct dquot * const *dquots; |
1da177e4 | 1720 | |
189eef59 | 1721 | if (!dquot_active(inode)) |
63936dda | 1722 | return 0; |
1da177e4 | 1723 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1724 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1725 | |
5bcd3b6f | 1726 | dquots = i_dquot(inode); |
b9ba6f94 | 1727 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1728 | spin_lock(&dq_data_lock); |
1729 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1730 | if (!dquots[cnt]) |
1da177e4 | 1731 | continue; |
bf097aaf | 1732 | ret = check_idq(dquots[cnt], 1, &warn[cnt]); |
efd8f0e6 | 1733 | if (ret) |
1da177e4 LT |
1734 | goto warn_put_all; |
1735 | } | |
1736 | ||
1737 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf | 1738 | if (!dquots[cnt]) |
1da177e4 | 1739 | continue; |
bf097aaf | 1740 | dquot_incr_inodes(dquots[cnt], 1); |
1da177e4 | 1741 | } |
efd8f0e6 | 1742 | |
1da177e4 LT |
1743 | warn_put_all: |
1744 | spin_unlock(&dq_data_lock); | |
63936dda | 1745 | if (ret == 0) |
bf097aaf | 1746 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1747 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1748 | flush_warnings(warn); |
1da177e4 LT |
1749 | return ret; |
1750 | } | |
08d0350c | 1751 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1752 | |
5dd4056d CH |
1753 | /* |
1754 | * Convert in-memory reserved quotas to real consumed quotas | |
1755 | */ | |
1756 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1757 | { |
5bcd3b6f | 1758 | struct dquot **dquots; |
b9ba6f94 | 1759 | int cnt, index; |
740d9dcd | 1760 | |
189eef59 | 1761 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1762 | inode_claim_rsv_space(inode, number); |
5dd4056d | 1763 | return 0; |
740d9dcd MC |
1764 | } |
1765 | ||
5bcd3b6f | 1766 | dquots = i_dquot(inode); |
b9ba6f94 | 1767 | index = srcu_read_lock(&dquot_srcu); |
740d9dcd MC |
1768 | spin_lock(&dq_data_lock); |
1769 | /* Claim reserved quotas to allocated quotas */ | |
1770 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
5bcd3b6f KK |
1771 | if (dquots[cnt]) |
1772 | dquot_claim_reserved_space(dquots[cnt], number); | |
740d9dcd MC |
1773 | } |
1774 | /* Update inode bytes */ | |
fd8fbfc1 | 1775 | inode_claim_rsv_space(inode, number); |
740d9dcd | 1776 | spin_unlock(&dq_data_lock); |
5bcd3b6f | 1777 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1778 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1779 | return 0; |
740d9dcd | 1780 | } |
5dd4056d | 1781 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1782 | |
1c8924eb JK |
1783 | /* |
1784 | * Convert allocated space back to in-memory reserved quotas | |
1785 | */ | |
1786 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1787 | { | |
5bcd3b6f | 1788 | struct dquot **dquots; |
b9ba6f94 | 1789 | int cnt, index; |
1c8924eb JK |
1790 | |
1791 | if (!dquot_active(inode)) { | |
1792 | inode_reclaim_rsv_space(inode, number); | |
1793 | return; | |
1794 | } | |
1795 | ||
5bcd3b6f | 1796 | dquots = i_dquot(inode); |
b9ba6f94 | 1797 | index = srcu_read_lock(&dquot_srcu); |
1c8924eb JK |
1798 | spin_lock(&dq_data_lock); |
1799 | /* Claim reserved quotas to allocated quotas */ | |
1800 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
5bcd3b6f KK |
1801 | if (dquots[cnt]) |
1802 | dquot_reclaim_reserved_space(dquots[cnt], number); | |
1c8924eb JK |
1803 | } |
1804 | /* Update inode bytes */ | |
1805 | inode_reclaim_rsv_space(inode, number); | |
1806 | spin_unlock(&dq_data_lock); | |
5bcd3b6f | 1807 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1808 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1809 | return; |
1810 | } | |
1811 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1812 | ||
1da177e4 LT |
1813 | /* |
1814 | * This operation can block, but only after everything is updated | |
1815 | */ | |
56246f9a | 1816 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1817 | { |
1818 | unsigned int cnt; | |
bf097aaf | 1819 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1820 | struct dquot **dquots; |
b9ba6f94 | 1821 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1822 | |
189eef59 | 1823 | if (!dquot_active(inode)) { |
fd8fbfc1 | 1824 | inode_decr_space(inode, number, reserve); |
5dd4056d | 1825 | return; |
1da177e4 | 1826 | } |
657d3bfa | 1827 | |
5bcd3b6f | 1828 | dquots = i_dquot(inode); |
b9ba6f94 | 1829 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1830 | spin_lock(&dq_data_lock); |
1831 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1832 | int wtype; |
1833 | ||
1834 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1835 | if (!dquots[cnt]) | |
1da177e4 | 1836 | continue; |
bf097aaf JK |
1837 | wtype = info_bdq_free(dquots[cnt], number); |
1838 | if (wtype != QUOTA_NL_NOWARN) | |
1839 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1840 | if (reserve) |
bf097aaf | 1841 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1842 | else |
bf097aaf | 1843 | dquot_decr_space(dquots[cnt], number); |
1da177e4 | 1844 | } |
fd8fbfc1 | 1845 | inode_decr_space(inode, number, reserve); |
1da177e4 | 1846 | spin_unlock(&dq_data_lock); |
fd8fbfc1 DM |
1847 | |
1848 | if (reserve) | |
1849 | goto out_unlock; | |
bf097aaf | 1850 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1851 | out_unlock: |
b9ba6f94 | 1852 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1853 | flush_warnings(warn); |
fd8fbfc1 | 1854 | } |
5dd4056d | 1855 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1856 | |
1da177e4 LT |
1857 | /* |
1858 | * This operation can block, but only after everything is updated | |
1859 | */ | |
6bab3596 | 1860 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1861 | { |
1862 | unsigned int cnt; | |
bf097aaf | 1863 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1864 | struct dquot * const *dquots; |
b9ba6f94 | 1865 | int index; |
1da177e4 | 1866 | |
189eef59 | 1867 | if (!dquot_active(inode)) |
63936dda | 1868 | return; |
657d3bfa | 1869 | |
5bcd3b6f | 1870 | dquots = i_dquot(inode); |
b9ba6f94 | 1871 | index = srcu_read_lock(&dquot_srcu); |
1da177e4 LT |
1872 | spin_lock(&dq_data_lock); |
1873 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
bf097aaf JK |
1874 | int wtype; |
1875 | ||
1876 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1877 | if (!dquots[cnt]) | |
1da177e4 | 1878 | continue; |
bf097aaf JK |
1879 | wtype = info_idq_free(dquots[cnt], 1); |
1880 | if (wtype != QUOTA_NL_NOWARN) | |
1881 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1882 | dquot_decr_inodes(dquots[cnt], 1); | |
1da177e4 LT |
1883 | } |
1884 | spin_unlock(&dq_data_lock); | |
bf097aaf | 1885 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1886 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1887 | flush_warnings(warn); |
1da177e4 | 1888 | } |
08d0350c | 1889 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1890 | |
1891 | /* | |
1892 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1893 | * On success, dquot references in transfer_to are consumed and references |
1894 | * to original dquots that need to be released are placed there. On failure, | |
1895 | * references are kept untouched. | |
1da177e4 LT |
1896 | * |
1897 | * This operation can block, but only after everything is updated | |
1898 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1899 | * |
b9ba6f94 NY |
1900 | * We are holding reference on transfer_from & transfer_to, no need to |
1901 | * protect them by srcu_read_lock(). | |
1da177e4 | 1902 | */ |
bc8e5f07 | 1903 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1904 | { |
740d9dcd MC |
1905 | qsize_t space, cur_space; |
1906 | qsize_t rsv_space = 0; | |
7a9ca53a | 1907 | qsize_t inode_usage = 1; |
bc8e5f07 | 1908 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1909 | int cnt, ret = 0; |
9e32784b | 1910 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1911 | struct dquot_warn warn_to[MAXQUOTAS]; |
1912 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1913 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1914 | |
1da177e4 | 1915 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1916 | return 0; |
7a9ca53a TE |
1917 | |
1918 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1919 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1920 | if (ret) | |
1921 | return ret; | |
1922 | } | |
1923 | ||
cc33412f | 1924 | /* Initialize the arrays */ |
bf097aaf JK |
1925 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1926 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1927 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1928 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1929 | } | |
b9ba6f94 NY |
1930 | |
1931 | spin_lock(&dq_data_lock); | |
cc33412f | 1932 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
b9ba6f94 | 1933 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1934 | return 0; |
cc33412f | 1935 | } |
740d9dcd | 1936 | cur_space = inode_get_bytes(inode); |
fd8fbfc1 | 1937 | rsv_space = inode_get_rsv_space(inode); |
740d9dcd | 1938 | space = cur_space + rsv_space; |
1da177e4 LT |
1939 | /* Build the transfer_from list and check the limits */ |
1940 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b D |
1941 | /* |
1942 | * Skip changes for same uid or gid or for turned off quota-type. | |
1943 | */ | |
dd6f3c6d | 1944 | if (!transfer_to[cnt]) |
1da177e4 | 1945 | continue; |
9e32784b D |
1946 | /* Avoid races with quotaoff() */ |
1947 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1948 | continue; | |
1949 | is_valid[cnt] = 1; | |
2d0fa467 | 1950 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7a9ca53a | 1951 | ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]); |
efd8f0e6 CH |
1952 | if (ret) |
1953 | goto over_quota; | |
bf097aaf | 1954 | ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); |
efd8f0e6 | 1955 | if (ret) |
cc33412f | 1956 | goto over_quota; |
1da177e4 LT |
1957 | } |
1958 | ||
1959 | /* | |
1960 | * Finally perform the needed transfer from transfer_from to transfer_to | |
1961 | */ | |
1962 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
9e32784b | 1963 | if (!is_valid[cnt]) |
1da177e4 | 1964 | continue; |
1da177e4 LT |
1965 | /* Due to IO error we might not have transfer_from[] structure */ |
1966 | if (transfer_from[cnt]) { | |
bf097aaf | 1967 | int wtype; |
7a9ca53a | 1968 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
1969 | if (wtype != QUOTA_NL_NOWARN) |
1970 | prepare_warning(&warn_from_inodes[cnt], | |
1971 | transfer_from[cnt], wtype); | |
1972 | wtype = info_bdq_free(transfer_from[cnt], space); | |
1973 | if (wtype != QUOTA_NL_NOWARN) | |
1974 | prepare_warning(&warn_from_space[cnt], | |
1975 | transfer_from[cnt], wtype); | |
7a9ca53a | 1976 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
1977 | dquot_decr_space(transfer_from[cnt], cur_space); |
1978 | dquot_free_reserved_space(transfer_from[cnt], | |
1979 | rsv_space); | |
1da177e4 LT |
1980 | } |
1981 | ||
7a9ca53a | 1982 | dquot_incr_inodes(transfer_to[cnt], inode_usage); |
740d9dcd MC |
1983 | dquot_incr_space(transfer_to[cnt], cur_space); |
1984 | dquot_resv_space(transfer_to[cnt], rsv_space); | |
1da177e4 | 1985 | |
2d0fa467 | 1986 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 1987 | } |
1da177e4 | 1988 | spin_unlock(&dq_data_lock); |
cc33412f | 1989 | |
dc52dd3a DM |
1990 | mark_all_dquot_dirty(transfer_from); |
1991 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
1992 | flush_warnings(warn_to); |
1993 | flush_warnings(warn_from_inodes); | |
1994 | flush_warnings(warn_from_space); | |
bc8e5f07 | 1995 | /* Pass back references to put */ |
dc52dd3a | 1996 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
1997 | if (is_valid[cnt]) |
1998 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 1999 | return 0; |
cc33412f JK |
2000 | over_quota: |
2001 | spin_unlock(&dq_data_lock); | |
bf097aaf | 2002 | flush_warnings(warn_to); |
86f3cbec | 2003 | return ret; |
1da177e4 | 2004 | } |
bc8e5f07 | 2005 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2006 | |
8ddd69d6 DM |
2007 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2008 | * Called from FSXXX_setattr() | |
2009 | */ | |
b43fa828 | 2010 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2011 | { |
bc8e5f07 | 2012 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2013 | struct dquot *dquot; |
bc8e5f07 JK |
2014 | struct super_block *sb = inode->i_sb; |
2015 | int ret; | |
8ddd69d6 | 2016 | |
189eef59 | 2017 | if (!dquot_active(inode)) |
bc8e5f07 | 2018 | return 0; |
12755627 | 2019 | |
6184fc0b JK |
2020 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2021 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2022 | if (IS_ERR(dquot)) { | |
2023 | if (PTR_ERR(dquot) != -ESRCH) { | |
2024 | ret = PTR_ERR(dquot); | |
2025 | goto out_put; | |
2026 | } | |
2027 | dquot = NULL; | |
2028 | } | |
2029 | transfer_to[USRQUOTA] = dquot; | |
2030 | } | |
2031 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2032 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2033 | if (IS_ERR(dquot)) { | |
2034 | if (PTR_ERR(dquot) != -ESRCH) { | |
2035 | ret = PTR_ERR(dquot); | |
2036 | goto out_put; | |
2037 | } | |
2038 | dquot = NULL; | |
2039 | } | |
2040 | transfer_to[GRPQUOTA] = dquot; | |
2041 | } | |
bc8e5f07 | 2042 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2043 | out_put: |
bc8e5f07 JK |
2044 | dqput_all(transfer_to); |
2045 | return ret; | |
b85f4b87 | 2046 | } |
b43fa828 | 2047 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2048 | |
1da177e4 LT |
2049 | /* |
2050 | * Write info of quota file to disk | |
2051 | */ | |
2052 | int dquot_commit_info(struct super_block *sb, int type) | |
2053 | { | |
1da177e4 LT |
2054 | struct quota_info *dqopt = sb_dqopt(sb); |
2055 | ||
9a8ae30e | 2056 | return dqopt->ops[type]->write_file_info(sb, type); |
1da177e4 | 2057 | } |
08d0350c | 2058 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2059 | |
be6257b2 JK |
2060 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2061 | { | |
2062 | struct quota_info *dqopt = sb_dqopt(sb); | |
be6257b2 | 2063 | |
9d1ccbe7 JK |
2064 | if (!sb_has_quota_active(sb, qid->type)) |
2065 | return -ESRCH; | |
2066 | if (!dqopt->ops[qid->type]->get_next_id) | |
2067 | return -ENOSYS; | |
f14618c6 | 2068 | return dqopt->ops[qid->type]->get_next_id(sb, qid); |
be6257b2 JK |
2069 | } |
2070 | EXPORT_SYMBOL(dquot_get_next_id); | |
2071 | ||
1da177e4 LT |
2072 | /* |
2073 | * Definitions of diskquota operations. | |
2074 | */ | |
61e225dc | 2075 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2076 | .write_dquot = dquot_commit, |
2077 | .acquire_dquot = dquot_acquire, | |
2078 | .release_dquot = dquot_release, | |
2079 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2080 | .write_info = dquot_commit_info, |
2081 | .alloc_dquot = dquot_alloc, | |
2082 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2083 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2084 | }; |
123e9caf | 2085 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2086 | |
907f4554 CH |
2087 | /* |
2088 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2089 | */ | |
2090 | int dquot_file_open(struct inode *inode, struct file *file) | |
2091 | { | |
2092 | int error; | |
2093 | ||
2094 | error = generic_file_open(inode, file); | |
2095 | if (!error && (file->f_mode & FMODE_WRITE)) | |
871a2931 | 2096 | dquot_initialize(inode); |
907f4554 CH |
2097 | return error; |
2098 | } | |
2099 | EXPORT_SYMBOL(dquot_file_open); | |
2100 | ||
1da177e4 LT |
2101 | /* |
2102 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2103 | */ | |
0f0dd62f | 2104 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2105 | { |
0ff5af83 | 2106 | int cnt, ret = 0; |
1da177e4 LT |
2107 | struct quota_info *dqopt = sb_dqopt(sb); |
2108 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2109 | |
7d6cd73d JK |
2110 | /* s_umount should be held in exclusive mode */ |
2111 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2112 | up_read(&sb->s_umount); | |
2113 | ||
f55abc0f JK |
2114 | /* Cannot turn off usage accounting without turning off limits, or |
2115 | * suspend quotas and simultaneously turn quotas off. */ | |
2116 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2117 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2118 | DQUOT_USAGE_ENABLED))) | |
2119 | return -EINVAL; | |
2120 | ||
9377abd0 JK |
2121 | /* |
2122 | * Skip everything if there's nothing to do. We have to do this because | |
2123 | * sometimes we are called when fill_super() failed and calling | |
2124 | * sync_fs() in such cases does no good. | |
2125 | */ | |
c3b00446 | 2126 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2127 | return 0; |
c3b00446 | 2128 | |
1da177e4 LT |
2129 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2130 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2131 | if (type != -1 && cnt != type) |
2132 | continue; | |
f55abc0f | 2133 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2134 | continue; |
f55abc0f JK |
2135 | |
2136 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2137 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2138 | dqopt->flags |= |
2139 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2140 | spin_unlock(&dq_state_lock); |
f55abc0f | 2141 | } else { |
cc33412f | 2142 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2143 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2144 | /* Turning off suspended quotas? */ | |
2145 | if (!sb_has_quota_loaded(sb, cnt) && | |
2146 | sb_has_quota_suspended(sb, cnt)) { | |
2147 | dqopt->flags &= ~dquot_state_flag( | |
2148 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2149 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2150 | iput(dqopt->files[cnt]); |
2151 | dqopt->files[cnt] = NULL; | |
2152 | continue; | |
2153 | } | |
cc33412f | 2154 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2155 | } |
f55abc0f JK |
2156 | |
2157 | /* We still have to keep quota loaded? */ | |
2158 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2159 | continue; |
1da177e4 LT |
2160 | |
2161 | /* Note: these are blocking operations */ | |
2162 | drop_dquot_ref(sb, cnt); | |
2163 | invalidate_dquots(sb, cnt); | |
2164 | /* | |
268157ba JK |
2165 | * Now all dquots should be invalidated, all writes done so we |
2166 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2167 | */ |
2168 | if (info_dirty(&dqopt->info[cnt])) | |
2169 | sb->dq_op->write_info(sb, cnt); | |
2170 | if (dqopt->ops[cnt]->free_file_info) | |
2171 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2172 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2173 | ||
2174 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2175 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2176 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2177 | dqopt->info[cnt].dqi_flags = 0; |
2178 | dqopt->info[cnt].dqi_igrace = 0; | |
2179 | dqopt->info[cnt].dqi_bgrace = 0; | |
2180 | dqopt->ops[cnt] = NULL; | |
2181 | } | |
ca785ec6 JK |
2182 | |
2183 | /* Skip syncing and setting flags if quota files are hidden */ | |
2184 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2185 | goto put_inodes; | |
2186 | ||
1da177e4 | 2187 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2188 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2189 | if (sb->s_op->sync_fs) |
2190 | sb->s_op->sync_fs(sb, 1); | |
2191 | sync_blockdev(sb->s_bdev); | |
2192 | /* Now the quota files are just ordinary files and we can set the | |
2193 | * inode flags back. Moreover we discard the pagecache so that | |
2194 | * userspace sees the writes we did bypassing the pagecache. We | |
2195 | * must also discard the blockdev buffers so that we see the | |
2196 | * changes done by userspace on the next quotaon() */ | |
2197 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2700e606 JK |
2198 | /* This can happen when suspending quotas on remount-ro... */ |
2199 | if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { | |
c3b00446 | 2200 | inode_lock(toputinode[cnt]); |
aad6cde9 | 2201 | toputinode[cnt]->i_flags &= ~S_NOQUOTA; |
c3b00446 JK |
2202 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); |
2203 | inode_unlock(toputinode[cnt]); | |
2204 | mark_inode_dirty_sync(toputinode[cnt]); | |
ca785ec6 JK |
2205 | } |
2206 | if (sb->s_bdev) | |
2207 | invalidate_bdev(sb->s_bdev); | |
2208 | put_inodes: | |
2209 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2210 | if (toputinode[cnt]) { | |
0ff5af83 | 2211 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2212 | * can reenable quota on the subsequent remount RW. We |
2213 | * have to check 'flags' variable and not use sb_has_ | |
2214 | * function because another quotaon / quotaoff could | |
2215 | * change global state before we got here. We refuse | |
2216 | * to suspend quotas when there is pending delete on | |
2217 | * the quota file... */ | |
2218 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2219 | iput(toputinode[cnt]); |
2220 | else if (!toputinode[cnt]->i_nlink) | |
2221 | ret = -EBUSY; | |
1da177e4 | 2222 | } |
0ff5af83 | 2223 | return ret; |
1da177e4 | 2224 | } |
0f0dd62f | 2225 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2226 | |
287a8095 | 2227 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2228 | { |
0f0dd62f CH |
2229 | return dquot_disable(sb, type, |
2230 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2231 | } |
287a8095 | 2232 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2233 | |
1da177e4 LT |
2234 | /* |
2235 | * Turn quotas on on a device | |
2236 | */ | |
2237 | ||
f55abc0f JK |
2238 | /* |
2239 | * Helper function to turn quotas on when we already have the inode of | |
2240 | * quota file and no quota information is loaded. | |
2241 | */ | |
2242 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2243 | unsigned int flags) | |
1da177e4 LT |
2244 | { |
2245 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2246 | struct super_block *sb = inode->i_sb; | |
2247 | struct quota_info *dqopt = sb_dqopt(sb); | |
2248 | int error; | |
1da177e4 LT |
2249 | |
2250 | if (!fmt) | |
2251 | return -ESRCH; | |
2252 | if (!S_ISREG(inode->i_mode)) { | |
2253 | error = -EACCES; | |
2254 | goto out_fmt; | |
2255 | } | |
2256 | if (IS_RDONLY(inode)) { | |
2257 | error = -EROFS; | |
2258 | goto out_fmt; | |
2259 | } | |
847aac64 LX |
2260 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2261 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2262 | error = -EINVAL; |
2263 | goto out_fmt; | |
2264 | } | |
5c004828 EB |
2265 | /* Filesystems outside of init_user_ns not yet supported */ |
2266 | if (sb->s_user_ns != &init_user_ns) { | |
2267 | error = -EINVAL; | |
2268 | goto out_fmt; | |
2269 | } | |
f55abc0f JK |
2270 | /* Usage always has to be set... */ |
2271 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2272 | error = -EINVAL; | |
2273 | goto out_fmt; | |
2274 | } | |
c3b00446 JK |
2275 | if (sb_has_quota_loaded(sb, type)) { |
2276 | error = -EBUSY; | |
2277 | goto out_fmt; | |
2278 | } | |
1da177e4 | 2279 | |
ca785ec6 | 2280 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2281 | /* As we bypass the pagecache we must now flush all the |
2282 | * dirty data and invalidate caches so that kernel sees | |
2283 | * changes from userspace. It is not enough to just flush | |
2284 | * the quota file since if blocksize < pagesize, invalidation | |
2285 | * of the cache could fail because of other unrelated dirty | |
2286 | * data */ | |
2287 | sync_filesystem(sb); | |
ca785ec6 JK |
2288 | invalidate_bdev(sb->s_bdev); |
2289 | } | |
ca785ec6 JK |
2290 | |
2291 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2292 | /* We don't want quota and atime on quota files (deadlocks | |
2293 | * possible) Also nobody should write to the file - we use | |
2294 | * special IO operations which ignore the immutable bit. */ | |
5955102c | 2295 | inode_lock(inode); |
aad6cde9 | 2296 | inode->i_flags |= S_NOQUOTA; |
5955102c | 2297 | inode_unlock(inode); |
26245c94 JK |
2298 | /* |
2299 | * When S_NOQUOTA is set, remove dquot references as no more | |
2300 | * references can be added | |
2301 | */ | |
9f754758 | 2302 | __dquot_drop(inode); |
ca785ec6 | 2303 | } |
1da177e4 LT |
2304 | |
2305 | error = -EIO; | |
2306 | dqopt->files[type] = igrab(inode); | |
2307 | if (!dqopt->files[type]) | |
c3b00446 | 2308 | goto out_file_flags; |
1da177e4 LT |
2309 | error = -EINVAL; |
2310 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2311 | goto out_file_init; | |
2312 | ||
2313 | dqopt->ops[type] = fmt->qf_ops; | |
2314 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2315 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2316 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
268157ba | 2317 | error = dqopt->ops[type]->read_file_info(sb, type); |
42fdb858 | 2318 | if (error < 0) |
1da177e4 | 2319 | goto out_file_init; |
15512377 JK |
2320 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { |
2321 | spin_lock(&dq_data_lock); | |
46fe44ce | 2322 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; |
15512377 JK |
2323 | spin_unlock(&dq_data_lock); |
2324 | } | |
cc33412f | 2325 | spin_lock(&dq_state_lock); |
f55abc0f | 2326 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2327 | spin_unlock(&dq_state_lock); |
1da177e4 LT |
2328 | |
2329 | add_dquot_ref(sb, type); | |
1da177e4 LT |
2330 | |
2331 | return 0; | |
2332 | ||
2333 | out_file_init: | |
2334 | dqopt->files[type] = NULL; | |
2335 | iput(inode); | |
c3b00446 | 2336 | out_file_flags: |
aad6cde9 JK |
2337 | inode_lock(inode); |
2338 | inode->i_flags &= ~S_NOQUOTA; | |
2339 | inode_unlock(inode); | |
1da177e4 LT |
2340 | out_fmt: |
2341 | put_quota_format(fmt); | |
2342 | ||
2343 | return error; | |
2344 | } | |
2345 | ||
0ff5af83 | 2346 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2347 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2348 | { |
2349 | struct quota_info *dqopt = sb_dqopt(sb); | |
2350 | struct inode *inode; | |
0f0dd62f | 2351 | int ret = 0, cnt; |
f55abc0f | 2352 | unsigned int flags; |
0ff5af83 | 2353 | |
7d6cd73d JK |
2354 | /* s_umount should be held in exclusive mode */ |
2355 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2356 | up_read(&sb->s_umount); | |
2357 | ||
0f0dd62f CH |
2358 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2359 | if (type != -1 && cnt != type) | |
2360 | continue; | |
c3b00446 | 2361 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2362 | continue; |
c3b00446 | 2363 | |
0f0dd62f CH |
2364 | inode = dqopt->files[cnt]; |
2365 | dqopt->files[cnt] = NULL; | |
2366 | spin_lock(&dq_state_lock); | |
2367 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2368 | DQUOT_LIMITS_ENABLED, | |
2369 | cnt); | |
2370 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2371 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2372 | |
0f0dd62f CH |
2373 | flags = dquot_generic_flag(flags, cnt); |
2374 | ret = vfs_load_quota_inode(inode, cnt, | |
2375 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2376 | iput(inode); | |
2377 | } | |
0ff5af83 JK |
2378 | |
2379 | return ret; | |
2380 | } | |
0f0dd62f | 2381 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2382 | |
f00c9e44 | 2383 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2384 | const struct path *path) |
77e69dac AV |
2385 | { |
2386 | int error = security_quota_on(path->dentry); | |
2387 | if (error) | |
2388 | return error; | |
2389 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2390 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2391 | error = -EXDEV; |
2392 | else | |
dea655c2 | 2393 | error = vfs_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2394 | format_id, DQUOT_USAGE_ENABLED | |
2395 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2396 | return error; |
2397 | } | |
287a8095 | 2398 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2399 | |
f55abc0f JK |
2400 | /* |
2401 | * More powerful function for turning on quotas allowing setting | |
2402 | * of individual quota flags | |
2403 | */ | |
287a8095 CH |
2404 | int dquot_enable(struct inode *inode, int type, int format_id, |
2405 | unsigned int flags) | |
f55abc0f | 2406 | { |
f55abc0f | 2407 | struct super_block *sb = inode->i_sb; |
f55abc0f JK |
2408 | |
2409 | /* Just unsuspend quotas? */ | |
0f0dd62f | 2410 | BUG_ON(flags & DQUOT_SUSPENDED); |
7d6cd73d JK |
2411 | /* s_umount should be held in exclusive mode */ |
2412 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2413 | up_read(&sb->s_umount); | |
0f0dd62f | 2414 | |
f55abc0f JK |
2415 | if (!flags) |
2416 | return 0; | |
2417 | /* Just updating flags needed? */ | |
2418 | if (sb_has_quota_loaded(sb, type)) { | |
f55abc0f | 2419 | if (flags & DQUOT_USAGE_ENABLED && |
c3b00446 JK |
2420 | sb_has_quota_usage_enabled(sb, type)) |
2421 | return -EBUSY; | |
f55abc0f | 2422 | if (flags & DQUOT_LIMITS_ENABLED && |
c3b00446 JK |
2423 | sb_has_quota_limits_enabled(sb, type)) |
2424 | return -EBUSY; | |
cc33412f | 2425 | spin_lock(&dq_state_lock); |
f55abc0f | 2426 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2427 | spin_unlock(&dq_state_lock); |
c3b00446 | 2428 | return 0; |
f55abc0f JK |
2429 | } |
2430 | ||
f55abc0f JK |
2431 | return vfs_load_quota_inode(inode, type, format_id, flags); |
2432 | } | |
287a8095 | 2433 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2434 | |
1da177e4 LT |
2435 | /* |
2436 | * This function is used when filesystem needs to initialize quotas | |
2437 | * during mount time. | |
2438 | */ | |
287a8095 | 2439 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2440 | int format_id, int type) |
1da177e4 | 2441 | { |
84de856e | 2442 | struct dentry *dentry; |
1da177e4 LT |
2443 | int error; |
2444 | ||
e12a4e8a | 2445 | dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2446 | if (IS_ERR(dentry)) |
2447 | return PTR_ERR(dentry); | |
2448 | ||
dea655c2 | 2449 | if (d_really_is_negative(dentry)) { |
154f484b JK |
2450 | error = -ENOENT; |
2451 | goto out; | |
2452 | } | |
2453 | ||
1da177e4 | 2454 | error = security_quota_on(dentry); |
84de856e | 2455 | if (!error) |
dea655c2 | 2456 | error = vfs_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2457 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2458 | |
154f484b | 2459 | out: |
84de856e CH |
2460 | dput(dentry); |
2461 | return error; | |
1da177e4 | 2462 | } |
287a8095 | 2463 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2464 | |
3e2af67e JK |
2465 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2466 | { | |
2467 | int ret; | |
2468 | int type; | |
2469 | struct quota_info *dqopt = sb_dqopt(sb); | |
2470 | ||
2471 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2472 | return -ENOSYS; | |
2473 | /* Accounting cannot be turned on while fs is mounted */ | |
2474 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2475 | if (!flags) | |
2476 | return -EINVAL; | |
2477 | for (type = 0; type < MAXQUOTAS; type++) { | |
2478 | if (!(flags & qtype_enforce_flag(type))) | |
2479 | continue; | |
2480 | /* Can't enforce without accounting */ | |
2481 | if (!sb_has_quota_usage_enabled(sb, type)) | |
2482 | return -EINVAL; | |
2483 | ret = dquot_enable(dqopt->files[type], type, | |
2484 | dqopt->info[type].dqi_fmt_id, | |
2485 | DQUOT_LIMITS_ENABLED); | |
2486 | if (ret < 0) | |
2487 | goto out_err; | |
2488 | } | |
2489 | return 0; | |
2490 | out_err: | |
2491 | /* Backout enforcement enablement we already did */ | |
2492 | for (type--; type >= 0; type--) { | |
2493 | if (flags & qtype_enforce_flag(type)) | |
2494 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2495 | } | |
2496 | /* Error code translation for better compatibility with XFS */ | |
2497 | if (ret == -EBUSY) | |
2498 | ret = -EEXIST; | |
2499 | return ret; | |
2500 | } | |
2501 | ||
2502 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2503 | { | |
2504 | int ret; | |
2505 | int type; | |
2506 | struct quota_info *dqopt = sb_dqopt(sb); | |
2507 | ||
2508 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2509 | return -ENOSYS; | |
2510 | /* | |
2511 | * We don't support turning off accounting via quotactl. In principle | |
2512 | * quota infrastructure can do this but filesystems don't expect | |
2513 | * userspace to be able to do it. | |
2514 | */ | |
2515 | if (flags & | |
2516 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2517 | return -EOPNOTSUPP; | |
2518 | ||
2519 | /* Filter out limits not enabled */ | |
2520 | for (type = 0; type < MAXQUOTAS; type++) | |
2521 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2522 | flags &= ~qtype_enforce_flag(type); | |
2523 | /* Nothing left? */ | |
2524 | if (!flags) | |
2525 | return -EEXIST; | |
2526 | for (type = 0; type < MAXQUOTAS; type++) { | |
2527 | if (flags & qtype_enforce_flag(type)) { | |
2528 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2529 | if (ret < 0) | |
2530 | goto out_err; | |
2531 | } | |
2532 | } | |
2533 | return 0; | |
2534 | out_err: | |
2535 | /* Backout enforcement disabling we already did */ | |
2536 | for (type--; type >= 0; type--) { | |
2537 | if (flags & qtype_enforce_flag(type)) | |
2538 | dquot_enable(dqopt->files[type], type, | |
2539 | dqopt->info[type].dqi_fmt_id, | |
2540 | DQUOT_LIMITS_ENABLED); | |
2541 | } | |
2542 | return ret; | |
2543 | } | |
2544 | ||
1da177e4 | 2545 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2546 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2547 | { |
2548 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2549 | ||
b9b2dd36 | 2550 | memset(di, 0, sizeof(*di)); |
1da177e4 | 2551 | spin_lock(&dq_data_lock); |
14bf61ff JK |
2552 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2553 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2554 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2555 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2556 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2557 | di->d_ino_count = dm->dqb_curinodes; | |
2558 | di->d_spc_timer = dm->dqb_btime; | |
2559 | di->d_ino_timer = dm->dqb_itime; | |
1da177e4 LT |
2560 | spin_unlock(&dq_data_lock); |
2561 | } | |
2562 | ||
74a8a103 | 2563 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2564 | struct qc_dqblk *di) |
1da177e4 LT |
2565 | { |
2566 | struct dquot *dquot; | |
2567 | ||
aca645a6 | 2568 | dquot = dqget(sb, qid); |
6184fc0b JK |
2569 | if (IS_ERR(dquot)) |
2570 | return PTR_ERR(dquot); | |
1da177e4 LT |
2571 | do_get_dqblk(dquot, di); |
2572 | dqput(dquot); | |
cc33412f | 2573 | |
1da177e4 LT |
2574 | return 0; |
2575 | } | |
287a8095 | 2576 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2577 | |
be6257b2 JK |
2578 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2579 | struct qc_dqblk *di) | |
2580 | { | |
2581 | struct dquot *dquot; | |
2582 | int err; | |
2583 | ||
2584 | if (!sb->dq_op->get_next_id) | |
2585 | return -ENOSYS; | |
2586 | err = sb->dq_op->get_next_id(sb, qid); | |
2587 | if (err < 0) | |
2588 | return err; | |
2589 | dquot = dqget(sb, *qid); | |
2590 | if (IS_ERR(dquot)) | |
2591 | return PTR_ERR(dquot); | |
2592 | do_get_dqblk(dquot, di); | |
2593 | dqput(dquot); | |
2594 | ||
2595 | return 0; | |
2596 | } | |
2597 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2598 | ||
14bf61ff JK |
2599 | #define VFS_QC_MASK \ |
2600 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2601 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2602 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2603 | |
1da177e4 | 2604 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2605 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2606 | { |
2607 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2608 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2609 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2610 | |
14bf61ff | 2611 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2612 | return -EINVAL; |
2613 | ||
14bf61ff | 2614 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2615 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2616 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2617 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2618 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2619 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2620 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2621 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2622 | return -ERANGE; |
1da177e4 LT |
2623 | |
2624 | spin_lock(&dq_data_lock); | |
14bf61ff JK |
2625 | if (di->d_fieldmask & QC_SPACE) { |
2626 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2627 | check_blim = 1; |
08261673 | 2628 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2629 | } |
c472b432 | 2630 | |
14bf61ff JK |
2631 | if (di->d_fieldmask & QC_SPC_SOFT) |
2632 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2633 | if (di->d_fieldmask & QC_SPC_HARD) | |
2634 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2635 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2636 | check_blim = 1; |
08261673 | 2637 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2638 | } |
c472b432 | 2639 | |
14bf61ff JK |
2640 | if (di->d_fieldmask & QC_INO_COUNT) { |
2641 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2642 | check_ilim = 1; |
08261673 | 2643 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2644 | } |
c472b432 | 2645 | |
14bf61ff | 2646 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2647 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2648 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2649 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2650 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2651 | check_ilim = 1; |
08261673 | 2652 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2653 | } |
c472b432 | 2654 | |
14bf61ff JK |
2655 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2656 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2657 | check_blim = 1; |
08261673 | 2658 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2659 | } |
c472b432 | 2660 | |
14bf61ff JK |
2661 | if (di->d_fieldmask & QC_INO_TIMER) { |
2662 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2663 | check_ilim = 1; |
08261673 | 2664 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2665 | } |
1da177e4 LT |
2666 | |
2667 | if (check_blim) { | |
268157ba JK |
2668 | if (!dm->dqb_bsoftlimit || |
2669 | dm->dqb_curspace < dm->dqb_bsoftlimit) { | |
1da177e4 LT |
2670 | dm->dqb_btime = 0; |
2671 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2672 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2673 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2674 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2675 | } |
2676 | if (check_ilim) { | |
268157ba JK |
2677 | if (!dm->dqb_isoftlimit || |
2678 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2679 | dm->dqb_itime = 0; |
2680 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2681 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2682 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2683 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2684 | } |
268157ba JK |
2685 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2686 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2687 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2688 | else | |
2689 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
2690 | spin_unlock(&dq_data_lock); | |
2691 | mark_dquot_dirty(dquot); | |
338bf9af AP |
2692 | |
2693 | return 0; | |
1da177e4 LT |
2694 | } |
2695 | ||
74a8a103 | 2696 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2697 | struct qc_dqblk *di) |
1da177e4 LT |
2698 | { |
2699 | struct dquot *dquot; | |
338bf9af | 2700 | int rc; |
1da177e4 | 2701 | |
aca645a6 | 2702 | dquot = dqget(sb, qid); |
6184fc0b JK |
2703 | if (IS_ERR(dquot)) { |
2704 | rc = PTR_ERR(dquot); | |
f55abc0f | 2705 | goto out; |
1da177e4 | 2706 | } |
338bf9af | 2707 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2708 | dqput(dquot); |
f55abc0f | 2709 | out: |
338bf9af | 2710 | return rc; |
1da177e4 | 2711 | } |
287a8095 | 2712 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2713 | |
2714 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2715 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2716 | { |
2717 | struct mem_dqinfo *mi; | |
0a240339 JK |
2718 | struct qc_type_state *tstate; |
2719 | struct quota_info *dqopt = sb_dqopt(sb); | |
2720 | int type; | |
1da177e4 | 2721 | |
0a240339 JK |
2722 | memset(state, 0, sizeof(*state)); |
2723 | for (type = 0; type < MAXQUOTAS; type++) { | |
2724 | if (!sb_has_quota_active(sb, type)) | |
2725 | continue; | |
2726 | tstate = state->s_state + type; | |
2727 | mi = sb_dqopt(sb)->info + type; | |
2728 | tstate->flags = QCI_ACCT_ENABLED; | |
2729 | spin_lock(&dq_data_lock); | |
2730 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2731 | tstate->flags |= QCI_SYSFILE; | |
2732 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2733 | tstate->flags |= QCI_ROOT_SQUASH; | |
2734 | if (sb_has_quota_limits_enabled(sb, type)) | |
2735 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2736 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2737 | tstate->ino_timelimit = mi->dqi_igrace; | |
2738 | tstate->ino = dqopt->files[type]->i_ino; | |
2739 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2740 | tstate->nextents = 1; /* We don't know... */ | |
2741 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2742 | } |
1da177e4 LT |
2743 | return 0; |
2744 | } | |
0a240339 | 2745 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2746 | |
2747 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2748 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2749 | { |
2750 | struct mem_dqinfo *mi; | |
f55abc0f | 2751 | int err = 0; |
1da177e4 | 2752 | |
5eacb2ac JK |
2753 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2754 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2755 | return -EINVAL; | |
9d1ccbe7 JK |
2756 | if (!sb_has_quota_active(sb, type)) |
2757 | return -ESRCH; | |
1da177e4 | 2758 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2759 | if (ii->i_fieldmask & QC_FLAGS) { |
2760 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2761 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2762 | return -EINVAL; | |
ca6cb091 | 2763 | } |
1da177e4 | 2764 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2765 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2766 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2767 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2768 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2769 | if (ii->i_fieldmask & QC_FLAGS) { | |
2770 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2771 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2772 | else | |
2773 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2774 | } | |
1da177e4 LT |
2775 | spin_unlock(&dq_data_lock); |
2776 | mark_info_dirty(sb, type); | |
2777 | /* Force write to disk */ | |
2778 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2779 | return err; |
1da177e4 | 2780 | } |
287a8095 | 2781 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2782 | |
3e2af67e JK |
2783 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2784 | .quota_enable = dquot_quota_enable, | |
2785 | .quota_disable = dquot_quota_disable, | |
2786 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2787 | .get_state = dquot_get_state, |
3e2af67e JK |
2788 | .set_info = dquot_set_dqinfo, |
2789 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2790 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2791 | .set_dqblk = dquot_set_dqblk |
2792 | }; | |
2793 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2794 | ||
dde95888 DM |
2795 | static int do_proc_dqstats(struct ctl_table *table, int write, |
2796 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2797 | { | |
dde95888 | 2798 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2799 | |
2800 | /* Update global table */ | |
2801 | dqstats.stat[type] = | |
2802 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2803 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2804 | } | |
2805 | ||
e628753b | 2806 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2807 | { |
1da177e4 | 2808 | .procname = "lookups", |
dde95888 | 2809 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2810 | .maxlen = sizeof(int), |
2811 | .mode = 0444, | |
dde95888 | 2812 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2813 | }, |
2814 | { | |
1da177e4 | 2815 | .procname = "drops", |
dde95888 | 2816 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2817 | .maxlen = sizeof(int), |
2818 | .mode = 0444, | |
dde95888 | 2819 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2820 | }, |
2821 | { | |
1da177e4 | 2822 | .procname = "reads", |
dde95888 | 2823 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2824 | .maxlen = sizeof(int), |
2825 | .mode = 0444, | |
dde95888 | 2826 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2827 | }, |
2828 | { | |
1da177e4 | 2829 | .procname = "writes", |
dde95888 | 2830 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2831 | .maxlen = sizeof(int), |
2832 | .mode = 0444, | |
dde95888 | 2833 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2834 | }, |
2835 | { | |
1da177e4 | 2836 | .procname = "cache_hits", |
dde95888 | 2837 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2838 | .maxlen = sizeof(int), |
2839 | .mode = 0444, | |
dde95888 | 2840 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2841 | }, |
2842 | { | |
1da177e4 | 2843 | .procname = "allocated_dquots", |
dde95888 | 2844 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2845 | .maxlen = sizeof(int), |
2846 | .mode = 0444, | |
dde95888 | 2847 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2848 | }, |
2849 | { | |
1da177e4 | 2850 | .procname = "free_dquots", |
dde95888 | 2851 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2852 | .maxlen = sizeof(int), |
2853 | .mode = 0444, | |
dde95888 | 2854 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2855 | }, |
2856 | { | |
1da177e4 | 2857 | .procname = "syncs", |
dde95888 | 2858 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2859 | .maxlen = sizeof(int), |
2860 | .mode = 0444, | |
dde95888 | 2861 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2862 | }, |
8e893469 | 2863 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2864 | { |
1da177e4 LT |
2865 | .procname = "warnings", |
2866 | .data = &flag_print_warnings, | |
2867 | .maxlen = sizeof(int), | |
2868 | .mode = 0644, | |
6d456111 | 2869 | .proc_handler = proc_dointvec, |
1da177e4 | 2870 | }, |
8e893469 | 2871 | #endif |
ab09203e | 2872 | { }, |
1da177e4 LT |
2873 | }; |
2874 | ||
e628753b | 2875 | static struct ctl_table fs_table[] = { |
1da177e4 | 2876 | { |
1da177e4 LT |
2877 | .procname = "quota", |
2878 | .mode = 0555, | |
2879 | .child = fs_dqstats_table, | |
2880 | }, | |
ab09203e | 2881 | { }, |
1da177e4 LT |
2882 | }; |
2883 | ||
e628753b | 2884 | static struct ctl_table sys_table[] = { |
1da177e4 | 2885 | { |
1da177e4 LT |
2886 | .procname = "fs", |
2887 | .mode = 0555, | |
2888 | .child = fs_table, | |
2889 | }, | |
ab09203e | 2890 | { }, |
1da177e4 LT |
2891 | }; |
2892 | ||
2893 | static int __init dquot_init(void) | |
2894 | { | |
f32764bd | 2895 | int i, ret; |
1da177e4 LT |
2896 | unsigned long nr_hash, order; |
2897 | ||
2898 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2899 | ||
0b4d4147 | 2900 | register_sysctl_table(sys_table); |
1da177e4 | 2901 | |
20c2df83 | 2902 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2903 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2904 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2905 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2906 | NULL); |
1da177e4 LT |
2907 | |
2908 | order = 0; | |
2909 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2910 | if (!dquot_hash) | |
2911 | panic("Cannot create dquot hash table"); | |
2912 | ||
f32764bd | 2913 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2914 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2915 | if (ret) |
2916 | panic("Cannot create dquot stat counters"); | |
2917 | } | |
dde95888 | 2918 | |
1da177e4 LT |
2919 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2920 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2921 | dq_hash_bits = 0; | |
2922 | do { | |
2923 | dq_hash_bits++; | |
2924 | } while (nr_hash >> dq_hash_bits); | |
2925 | dq_hash_bits--; | |
2926 | ||
2927 | nr_hash = 1UL << dq_hash_bits; | |
2928 | dq_hash_mask = nr_hash - 1; | |
2929 | for (i = 0; i < nr_hash; i++) | |
2930 | INIT_HLIST_HEAD(dquot_hash + i); | |
2931 | ||
19858e7b AB |
2932 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2933 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2934 | |
8e1f936b | 2935 | register_shrinker(&dqcache_shrinker); |
1da177e4 LT |
2936 | |
2937 | return 0; | |
2938 | } | |
331221fa | 2939 | fs_initcall(dquot_init); |