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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
4 | * is implemented using the BSD system call interface as the means of | |
5 | * communication with the user level. This file contains the generic routines | |
6 | * called by the different filesystems on allocation of an inode or block. | |
7 | * These routines take care of the administration needed to have a consistent | |
8 | * diskquota tracking system. The ideas of both user and group quotas are based | |
9 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
10 | * implementation is based on one of the several variants of the LINUX | |
11 | * inode-subsystem with added complexity of the diskquota system. | |
27942ef5 | 12 | * |
1da177e4 LT |
13 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
14 | * | |
15 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
16 | * | |
17 | * Revised list management to avoid races | |
18 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
19 | * | |
20 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
21 | * As the consequence the locking was moved from dquot_decr_...(), | |
22 | * dquot_incr_...() to calling functions. | |
23 | * invalidate_dquots() now writes modified dquots. | |
24 | * Serialized quota_off() and quota_on() for mount point. | |
25 | * Fixed a few bugs in grow_dquots(). | |
26 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
27 | * quota files | |
28 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
29 | * add_dquot_ref() restarts after blocking | |
30 | * Added check for bogus uid and fixed check for group in quotactl. | |
31 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
32 | * | |
33 | * Used struct list_head instead of own list struct | |
34 | * Invalidation of referenced dquots is no longer possible | |
35 | * Improved free_dquots list management | |
36 | * Quota and i_blocks are now updated in one place to avoid races | |
37 | * Warnings are now delayed so we won't block in critical section | |
38 | * Write updated not to require dquot lock | |
39 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
40 | * | |
41 | * Added dynamic quota structure allocation | |
42 | * Jan Kara <jack@suse.cz> 12/2000 | |
43 | * | |
44 | * Rewritten quota interface. Implemented new quota format and | |
45 | * formats registering. | |
46 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
47 | * | |
48 | * New SMP locking. | |
49 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
50 | * | |
51 | * Added journalled quota support, fix lock inversion problems | |
52 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
53 | * | |
27942ef5 | 54 | * (C) Copyright 1994 - 1997 Marco van Wieringen |
1da177e4 LT |
55 | */ |
56 | ||
57 | #include <linux/errno.h> | |
58 | #include <linux/kernel.h> | |
59 | #include <linux/fs.h> | |
60 | #include <linux/mount.h> | |
61 | #include <linux/mm.h> | |
62 | #include <linux/time.h> | |
63 | #include <linux/types.h> | |
64 | #include <linux/string.h> | |
65 | #include <linux/fcntl.h> | |
66 | #include <linux/stat.h> | |
67 | #include <linux/tty.h> | |
68 | #include <linux/file.h> | |
69 | #include <linux/slab.h> | |
70 | #include <linux/sysctl.h> | |
1da177e4 LT |
71 | #include <linux/init.h> |
72 | #include <linux/module.h> | |
73 | #include <linux/proc_fs.h> | |
74 | #include <linux/security.h> | |
40401530 | 75 | #include <linux/sched.h> |
5b825c3a | 76 | #include <linux/cred.h> |
1da177e4 LT |
77 | #include <linux/kmod.h> |
78 | #include <linux/namei.h> | |
16f7e0fe | 79 | #include <linux/capability.h> |
be586bab | 80 | #include <linux/quotaops.h> |
55fa6091 | 81 | #include "../internal.h" /* ugh */ |
1da177e4 | 82 | |
f3da9310 | 83 | #include <linux/uaccess.h> |
1da177e4 | 84 | |
1da177e4 | 85 | /* |
7b9ca4c6 JK |
86 | * There are five quota SMP locks: |
87 | * * dq_list_lock protects all lists with quotas and quota formats. | |
88 | * * dquot->dq_dqb_lock protects data from dq_dqb | |
89 | * * inode->i_lock protects inode->i_blocks, i_bytes and also guards | |
90 | * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that | |
91 | * dquot_transfer() can stabilize amount it transfers | |
92 | * * dq_data_lock protects mem_dqinfo structures and modifications of dquot | |
93 | * pointers in the inode | |
94 | * * dq_state_lock protects modifications of quota state (on quotaon and | |
95 | * quotaoff) and readers who care about latest values take it as well. | |
1da177e4 | 96 | * |
7b9ca4c6 JK |
97 | * The spinlock ordering is hence: |
98 | * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock, | |
cc33412f | 99 | * dq_list_lock > dq_state_lock |
1da177e4 LT |
100 | * |
101 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
102 | * the life of the dquot structure and so needn't to be protected by a lock | |
103 | * | |
b9ba6f94 NY |
104 | * Operation accessing dquots via inode pointers are protected by dquot_srcu. |
105 | * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and | |
106 | * synchronize_srcu(&dquot_srcu) is called after clearing pointers from | |
107 | * inode and before dropping dquot references to avoid use of dquots after | |
108 | * they are freed. dq_data_lock is used to serialize the pointer setting and | |
109 | * clearing operations. | |
26245c94 JK |
110 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that |
111 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
b9ba6f94 NY |
112 | * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they |
113 | * have to do all pointer modifications before dropping dq_data_lock. This makes | |
26245c94 JK |
114 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and |
115 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 116 | * |
5e8cb9b6 JK |
117 | * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to |
118 | * memory (or space for it is being allocated) on the first dqget(), when it is | |
119 | * being written out, and when it is being released on the last dqput(). The | |
120 | * allocation and release operations are serialized by the dq_lock and by | |
121 | * checking the use count in dquot_release(). | |
1da177e4 LT |
122 | * |
123 | * Lock ordering (including related VFS locks) is the following: | |
bc8230ee | 124 | * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem |
1da177e4 LT |
125 | */ |
126 | ||
c516610c JK |
127 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
128 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
129 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 130 | EXPORT_SYMBOL(dq_data_lock); |
b9ba6f94 | 131 | DEFINE_STATIC_SRCU(dquot_srcu); |
1da177e4 | 132 | |
503330f3 JK |
133 | static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); |
134 | ||
fb5ffb0e | 135 | void __quota_error(struct super_block *sb, const char *func, |
055adcbd | 136 | const char *fmt, ...) |
fb5ffb0e | 137 | { |
fb5ffb0e | 138 | if (printk_ratelimit()) { |
055adcbd JP |
139 | va_list args; |
140 | struct va_format vaf; | |
141 | ||
fb5ffb0e | 142 | va_start(args, fmt); |
055adcbd JP |
143 | |
144 | vaf.fmt = fmt; | |
145 | vaf.va = &args; | |
146 | ||
147 | printk(KERN_ERR "Quota error (device %s): %s: %pV\n", | |
148 | sb->s_id, func, &vaf); | |
149 | ||
fb5ffb0e JZ |
150 | va_end(args); |
151 | } | |
152 | } | |
153 | EXPORT_SYMBOL(__quota_error); | |
154 | ||
da8d1ba2 | 155 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 156 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 157 | #endif |
1da177e4 LT |
158 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
159 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
160 | ||
161 | /* SLAB cache for dquot structures */ | |
e18b890b | 162 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
163 | |
164 | int register_quota_format(struct quota_format_type *fmt) | |
165 | { | |
166 | spin_lock(&dq_list_lock); | |
167 | fmt->qf_next = quota_formats; | |
168 | quota_formats = fmt; | |
169 | spin_unlock(&dq_list_lock); | |
170 | return 0; | |
171 | } | |
08d0350c | 172 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
173 | |
174 | void unregister_quota_format(struct quota_format_type *fmt) | |
175 | { | |
176 | struct quota_format_type **actqf; | |
177 | ||
178 | spin_lock(&dq_list_lock); | |
268157ba JK |
179 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
180 | actqf = &(*actqf)->qf_next) | |
181 | ; | |
1da177e4 LT |
182 | if (*actqf) |
183 | *actqf = (*actqf)->qf_next; | |
184 | spin_unlock(&dq_list_lock); | |
185 | } | |
08d0350c | 186 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
187 | |
188 | static struct quota_format_type *find_quota_format(int id) | |
189 | { | |
190 | struct quota_format_type *actqf; | |
191 | ||
192 | spin_lock(&dq_list_lock); | |
268157ba JK |
193 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
194 | actqf = actqf->qf_next) | |
195 | ; | |
1da177e4 LT |
196 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
197 | int qm; | |
198 | ||
199 | spin_unlock(&dq_list_lock); | |
27942ef5 | 200 | |
268157ba JK |
201 | for (qm = 0; module_names[qm].qm_fmt_id && |
202 | module_names[qm].qm_fmt_id != id; qm++) | |
203 | ; | |
204 | if (!module_names[qm].qm_fmt_id || | |
205 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
206 | return NULL; |
207 | ||
208 | spin_lock(&dq_list_lock); | |
268157ba JK |
209 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
210 | actqf = actqf->qf_next) | |
211 | ; | |
1da177e4 LT |
212 | if (actqf && !try_module_get(actqf->qf_owner)) |
213 | actqf = NULL; | |
214 | } | |
215 | spin_unlock(&dq_list_lock); | |
216 | return actqf; | |
217 | } | |
218 | ||
219 | static void put_quota_format(struct quota_format_type *fmt) | |
220 | { | |
221 | module_put(fmt->qf_owner); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Dquot List Management: | |
226 | * The quota code uses three lists for dquot management: the inuse_list, | |
227 | * free_dquots, and dquot_hash[] array. A single dquot structure may be | |
228 | * on all three lists, depending on its current state. | |
229 | * | |
230 | * All dquots are placed to the end of inuse_list when first created, and this | |
231 | * list is used for invalidate operation, which must look at every dquot. | |
232 | * | |
233 | * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, | |
234 | * and this list is searched whenever we need an available dquot. Dquots are | |
235 | * removed from the list as soon as they are used again, and | |
236 | * dqstats.free_dquots gives the number of dquots on the list. When | |
237 | * dquot is invalidated it's completely released from memory. | |
238 | * | |
239 | * Dquots with a specific identity (device, type and id) are placed on | |
240 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
241 | * mechanism to locate a specific dquot. | |
242 | */ | |
243 | ||
244 | static LIST_HEAD(inuse_list); | |
245 | static LIST_HEAD(free_dquots); | |
246 | static unsigned int dq_hash_bits, dq_hash_mask; | |
247 | static struct hlist_head *dquot_hash; | |
248 | ||
249 | struct dqstats dqstats; | |
08d0350c | 250 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 251 | |
0a5a9c72 | 252 | static qsize_t inode_get_rsv_space(struct inode *inode); |
7b9ca4c6 | 253 | static qsize_t __inode_get_rsv_space(struct inode *inode); |
6184fc0b | 254 | static int __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 255 | |
1da177e4 | 256 | static inline unsigned int |
1a06d420 | 257 | hashfn(const struct super_block *sb, struct kqid qid) |
1da177e4 | 258 | { |
1a06d420 EB |
259 | unsigned int id = from_kqid(&init_user_ns, qid); |
260 | int type = qid.type; | |
1da177e4 LT |
261 | unsigned long tmp; |
262 | ||
263 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
264 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Following list functions expect dq_list_lock to be held | |
269 | */ | |
270 | static inline void insert_dquot_hash(struct dquot *dquot) | |
271 | { | |
268157ba | 272 | struct hlist_head *head; |
1a06d420 | 273 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); |
1da177e4 LT |
274 | hlist_add_head(&dquot->dq_hash, head); |
275 | } | |
276 | ||
277 | static inline void remove_dquot_hash(struct dquot *dquot) | |
278 | { | |
279 | hlist_del_init(&dquot->dq_hash); | |
280 | } | |
281 | ||
7a2435d8 | 282 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
1a06d420 | 283 | struct kqid qid) |
1da177e4 LT |
284 | { |
285 | struct hlist_node *node; | |
286 | struct dquot *dquot; | |
287 | ||
288 | hlist_for_each (node, dquot_hash+hashent) { | |
289 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
4c376dca | 290 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 LT |
291 | return dquot; |
292 | } | |
dd6f3c6d | 293 | return NULL; |
1da177e4 LT |
294 | } |
295 | ||
296 | /* Add a dquot to the tail of the free list */ | |
297 | static inline void put_dquot_last(struct dquot *dquot) | |
298 | { | |
8e13059a | 299 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 300 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
301 | } |
302 | ||
303 | static inline void remove_free_dquot(struct dquot *dquot) | |
304 | { | |
305 | if (list_empty(&dquot->dq_free)) | |
306 | return; | |
307 | list_del_init(&dquot->dq_free); | |
dde95888 | 308 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
309 | } |
310 | ||
311 | static inline void put_inuse(struct dquot *dquot) | |
312 | { | |
313 | /* We add to the back of inuse list so we don't have to restart | |
314 | * when traversing this list and we block */ | |
8e13059a | 315 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 316 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
317 | } |
318 | ||
319 | static inline void remove_inuse(struct dquot *dquot) | |
320 | { | |
dde95888 | 321 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
322 | list_del(&dquot->dq_inuse); |
323 | } | |
324 | /* | |
325 | * End of list functions needing dq_list_lock | |
326 | */ | |
327 | ||
328 | static void wait_on_dquot(struct dquot *dquot) | |
329 | { | |
d3be915f IM |
330 | mutex_lock(&dquot->dq_lock); |
331 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
332 | } |
333 | ||
03f6e92b JK |
334 | static inline int dquot_dirty(struct dquot *dquot) |
335 | { | |
336 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
337 | } | |
338 | ||
339 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
340 | { | |
341 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
342 | } | |
1da177e4 | 343 | |
eabf290d | 344 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
345 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
346 | { | |
eabf290d DM |
347 | int ret = 1; |
348 | ||
4580b30e JK |
349 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
350 | return 0; | |
351 | ||
834057bf JK |
352 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
353 | return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); | |
354 | ||
eabf290d DM |
355 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ |
356 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
357 | return 1; | |
358 | ||
1da177e4 | 359 | spin_lock(&dq_list_lock); |
eabf290d | 360 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 361 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 362 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
363 | ret = 0; |
364 | } | |
1da177e4 | 365 | spin_unlock(&dq_list_lock); |
eabf290d | 366 | return ret; |
1da177e4 | 367 | } |
08d0350c | 368 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 369 | |
dc52dd3a DM |
370 | /* Dirtify all the dquots - this can block when journalling */ |
371 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
372 | { | |
373 | int ret, err, cnt; | |
374 | ||
375 | ret = err = 0; | |
376 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
377 | if (dquot[cnt]) | |
378 | /* Even in case of error we have to continue */ | |
379 | ret = mark_dquot_dirty(dquot[cnt]); | |
380 | if (!err) | |
381 | err = ret; | |
382 | } | |
383 | return err; | |
384 | } | |
385 | ||
386 | static inline void dqput_all(struct dquot **dquot) | |
387 | { | |
388 | unsigned int cnt; | |
389 | ||
390 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
391 | dqput(dquot[cnt]); | |
392 | } | |
393 | ||
1da177e4 LT |
394 | static inline int clear_dquot_dirty(struct dquot *dquot) |
395 | { | |
834057bf JK |
396 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
397 | return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); | |
398 | ||
1e0b7cb0 JK |
399 | spin_lock(&dq_list_lock); |
400 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { | |
401 | spin_unlock(&dq_list_lock); | |
1da177e4 | 402 | return 0; |
1e0b7cb0 | 403 | } |
1da177e4 | 404 | list_del_init(&dquot->dq_dirty); |
1e0b7cb0 | 405 | spin_unlock(&dq_list_lock); |
1da177e4 LT |
406 | return 1; |
407 | } | |
408 | ||
409 | void mark_info_dirty(struct super_block *sb, int type) | |
410 | { | |
15512377 JK |
411 | spin_lock(&dq_data_lock); |
412 | sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; | |
413 | spin_unlock(&dq_data_lock); | |
1da177e4 LT |
414 | } |
415 | EXPORT_SYMBOL(mark_info_dirty); | |
416 | ||
417 | /* | |
418 | * Read dquot from disk and alloc space for it | |
419 | */ | |
420 | ||
421 | int dquot_acquire(struct dquot *dquot) | |
422 | { | |
423 | int ret = 0, ret2 = 0; | |
424 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
425 | ||
d3be915f | 426 | mutex_lock(&dquot->dq_lock); |
3ef177ec | 427 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { |
4c376dca | 428 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
3ef177ec CX |
429 | if (ret < 0) |
430 | goto out_iolock; | |
431 | } | |
044c9b67 JK |
432 | /* Make sure flags update is visible after dquot has been filled */ |
433 | smp_mb__before_atomic(); | |
1da177e4 LT |
434 | set_bit(DQ_READ_B, &dquot->dq_flags); |
435 | /* Instantiate dquot if needed */ | |
436 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 437 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 438 | /* Write the info if needed */ |
4c376dca EB |
439 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
440 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
441 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 442 | } |
1da177e4 LT |
443 | if (ret < 0) |
444 | goto out_iolock; | |
445 | if (ret2 < 0) { | |
446 | ret = ret2; | |
447 | goto out_iolock; | |
448 | } | |
449 | } | |
044c9b67 JK |
450 | /* |
451 | * Make sure flags update is visible after on-disk struct has been | |
452 | * allocated. Paired with smp_rmb() in dqget(). | |
453 | */ | |
454 | smp_mb__before_atomic(); | |
1da177e4 LT |
455 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
456 | out_iolock: | |
d3be915f | 457 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
458 | return ret; |
459 | } | |
08d0350c | 460 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
461 | |
462 | /* | |
463 | * Write dquot to disk | |
464 | */ | |
465 | int dquot_commit(struct dquot *dquot) | |
466 | { | |
b03f2456 | 467 | int ret = 0; |
1da177e4 LT |
468 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
469 | ||
5e8cb9b6 | 470 | mutex_lock(&dquot->dq_lock); |
1e0b7cb0 | 471 | if (!clear_dquot_dirty(dquot)) |
5e8cb9b6 | 472 | goto out_lock; |
1da177e4 LT |
473 | /* Inactive dquot can be only if there was error during read/init |
474 | * => we have better not writing it */ | |
b03f2456 | 475 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 476 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
477 | else |
478 | ret = -EIO; | |
5e8cb9b6 JK |
479 | out_lock: |
480 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
481 | return ret; |
482 | } | |
08d0350c | 483 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
484 | |
485 | /* | |
486 | * Release dquot | |
487 | */ | |
488 | int dquot_release(struct dquot *dquot) | |
489 | { | |
490 | int ret = 0, ret2 = 0; | |
491 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
492 | ||
d3be915f | 493 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
494 | /* Check whether we are not racing with some other dqget() */ |
495 | if (atomic_read(&dquot->dq_count) > 1) | |
496 | goto out_dqlock; | |
4c376dca EB |
497 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
498 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 499 | /* Write the info */ |
4c376dca EB |
500 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
501 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
502 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 503 | } |
1da177e4 LT |
504 | if (ret >= 0) |
505 | ret = ret2; | |
506 | } | |
507 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
1da177e4 | 508 | out_dqlock: |
d3be915f | 509 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
510 | return ret; |
511 | } | |
08d0350c | 512 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 513 | |
7d9056ba | 514 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
515 | { |
516 | kmem_cache_free(dquot_cachep, dquot); | |
517 | } | |
7d9056ba | 518 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
519 | |
520 | static inline void do_destroy_dquot(struct dquot *dquot) | |
521 | { | |
522 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
523 | } | |
524 | ||
1da177e4 LT |
525 | /* Invalidate all dquots on the list. Note that this function is called after |
526 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
527 | * quota users. There can still be some users of quotas due to inodes being |
528 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 529 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 530 | */ |
1da177e4 LT |
531 | static void invalidate_dquots(struct super_block *sb, int type) |
532 | { | |
c33ed271 | 533 | struct dquot *dquot, *tmp; |
1da177e4 | 534 | |
6362e4d4 | 535 | restart: |
1da177e4 | 536 | spin_lock(&dq_list_lock); |
c33ed271 | 537 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
538 | if (dquot->dq_sb != sb) |
539 | continue; | |
4c376dca | 540 | if (dquot->dq_id.type != type) |
1da177e4 | 541 | continue; |
6362e4d4 JK |
542 | /* Wait for dquot users */ |
543 | if (atomic_read(&dquot->dq_count)) { | |
9f985cb6 | 544 | dqgrab(dquot); |
6362e4d4 | 545 | spin_unlock(&dq_list_lock); |
503330f3 JK |
546 | /* |
547 | * Once dqput() wakes us up, we know it's time to free | |
6362e4d4 JK |
548 | * the dquot. |
549 | * IMPORTANT: we rely on the fact that there is always | |
550 | * at most one process waiting for dquot to free. | |
551 | * Otherwise dq_count would be > 1 and we would never | |
552 | * wake up. | |
553 | */ | |
503330f3 JK |
554 | wait_event(dquot_ref_wq, |
555 | atomic_read(&dquot->dq_count) == 1); | |
6362e4d4 JK |
556 | dqput(dquot); |
557 | /* At this moment dquot() need not exist (it could be | |
558 | * reclaimed by prune_dqcache(). Hence we must | |
559 | * restart. */ | |
560 | goto restart; | |
561 | } | |
562 | /* | |
563 | * Quota now has no users and it has been written on last | |
564 | * dqput() | |
565 | */ | |
1da177e4 LT |
566 | remove_dquot_hash(dquot); |
567 | remove_free_dquot(dquot); | |
568 | remove_inuse(dquot); | |
74f783af | 569 | do_destroy_dquot(dquot); |
1da177e4 LT |
570 | } |
571 | spin_unlock(&dq_list_lock); | |
572 | } | |
573 | ||
12c77527 JK |
574 | /* Call callback for every active dquot on given filesystem */ |
575 | int dquot_scan_active(struct super_block *sb, | |
576 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
577 | unsigned long priv) | |
578 | { | |
579 | struct dquot *dquot, *old_dquot = NULL; | |
580 | int ret = 0; | |
581 | ||
ee1ac541 JK |
582 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
583 | ||
12c77527 JK |
584 | spin_lock(&dq_list_lock); |
585 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
586 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
587 | continue; | |
588 | if (dquot->dq_sb != sb) | |
589 | continue; | |
590 | /* Now we have active dquot so we can just increase use count */ | |
591 | atomic_inc(&dquot->dq_count); | |
12c77527 | 592 | spin_unlock(&dq_list_lock); |
dde95888 | 593 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
594 | dqput(old_dquot); |
595 | old_dquot = dquot; | |
1362f4ea JK |
596 | /* |
597 | * ->release_dquot() can be racing with us. Our reference | |
598 | * protects us from new calls to it so just wait for any | |
599 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
600 | */ | |
601 | wait_on_dquot(dquot); | |
602 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
603 | ret = fn(dquot, priv); | |
604 | if (ret < 0) | |
605 | goto out; | |
606 | } | |
12c77527 JK |
607 | spin_lock(&dq_list_lock); |
608 | /* We are safe to continue now because our dquot could not | |
609 | * be moved out of the inuse list while we hold the reference */ | |
610 | } | |
611 | spin_unlock(&dq_list_lock); | |
612 | out: | |
613 | dqput(old_dquot); | |
12c77527 JK |
614 | return ret; |
615 | } | |
08d0350c | 616 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 617 | |
ceed1723 JK |
618 | /* Write all dquot structures to quota files */ |
619 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
620 | { |
621 | struct list_head *dirty; | |
622 | struct dquot *dquot; | |
623 | struct quota_info *dqopt = sb_dqopt(sb); | |
624 | int cnt; | |
ceed1723 | 625 | int err, ret = 0; |
1da177e4 | 626 | |
9d1ccbe7 JK |
627 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
628 | ||
1da177e4 LT |
629 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
630 | if (type != -1 && cnt != type) | |
631 | continue; | |
f55abc0f | 632 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
633 | continue; |
634 | spin_lock(&dq_list_lock); | |
635 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
636 | while (!list_empty(dirty)) { | |
268157ba JK |
637 | dquot = list_first_entry(dirty, struct dquot, |
638 | dq_dirty); | |
4580b30e JK |
639 | |
640 | WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); | |
641 | ||
1da177e4 LT |
642 | /* Now we have active dquot from which someone is |
643 | * holding reference so we can safely just increase | |
644 | * use count */ | |
9f985cb6 | 645 | dqgrab(dquot); |
1da177e4 | 646 | spin_unlock(&dq_list_lock); |
dde95888 | 647 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 | 648 | err = sb->dq_op->write_dquot(dquot); |
dd5f6279 | 649 | if (err) { |
650 | /* | |
651 | * Clear dirty bit anyway to avoid infinite | |
652 | * loop here. | |
653 | */ | |
654 | clear_dquot_dirty(dquot); | |
655 | if (!ret) | |
656 | ret = err; | |
657 | } | |
1da177e4 LT |
658 | dqput(dquot); |
659 | spin_lock(&dq_list_lock); | |
660 | } | |
661 | spin_unlock(&dq_list_lock); | |
662 | } | |
663 | ||
664 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
665 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
666 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 667 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 668 | dqstats_inc(DQST_SYNCS); |
1da177e4 | 669 | |
ceed1723 JK |
670 | return ret; |
671 | } | |
672 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
673 | ||
674 | /* Write all dquot structures to disk and make them visible from userspace */ | |
675 | int dquot_quota_sync(struct super_block *sb, int type) | |
676 | { | |
677 | struct quota_info *dqopt = sb_dqopt(sb); | |
678 | int cnt; | |
679 | int ret; | |
680 | ||
681 | ret = dquot_writeback_dquots(sb, type); | |
682 | if (ret) | |
683 | return ret; | |
684 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
685 | return 0; |
686 | ||
687 | /* This is not very clever (and fast) but currently I don't know about | |
688 | * any other simple way of getting quota data to disk and we must get | |
689 | * them there for userspace to be visible... */ | |
690 | if (sb->s_op->sync_fs) | |
691 | sb->s_op->sync_fs(sb, 1); | |
692 | sync_blockdev(sb->s_bdev); | |
693 | ||
694 | /* | |
695 | * Now when everything is written we can discard the pagecache so | |
696 | * that userspace sees the changes. | |
697 | */ | |
5fb324ad CH |
698 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
699 | if (type != -1 && cnt != type) | |
700 | continue; | |
701 | if (!sb_has_quota_active(sb, cnt)) | |
702 | continue; | |
5955102c | 703 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 704 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 705 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 706 | } |
5fb324ad | 707 | |
1da177e4 LT |
708 | return 0; |
709 | } | |
287a8095 | 710 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 711 | |
1ab6c499 DC |
712 | static unsigned long |
713 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 714 | { |
1da177e4 | 715 | struct dquot *dquot; |
1ab6c499 | 716 | unsigned long freed = 0; |
1da177e4 | 717 | |
d68aab6b | 718 | spin_lock(&dq_list_lock); |
1822193b JK |
719 | while (!list_empty(&free_dquots) && sc->nr_to_scan) { |
720 | dquot = list_first_entry(&free_dquots, struct dquot, dq_free); | |
1da177e4 LT |
721 | remove_dquot_hash(dquot); |
722 | remove_free_dquot(dquot); | |
723 | remove_inuse(dquot); | |
74f783af | 724 | do_destroy_dquot(dquot); |
1ab6c499 DC |
725 | sc->nr_to_scan--; |
726 | freed++; | |
1da177e4 | 727 | } |
d68aab6b | 728 | spin_unlock(&dq_list_lock); |
1ab6c499 | 729 | return freed; |
1da177e4 LT |
730 | } |
731 | ||
1ab6c499 DC |
732 | static unsigned long |
733 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 734 | { |
55f841ce GC |
735 | return vfs_pressure_ratio( |
736 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
737 | } |
738 | ||
8e1f936b | 739 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
740 | .count_objects = dqcache_shrink_count, |
741 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
742 | .seeks = DEFAULT_SEEKS, |
743 | }; | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * Put reference to dquot | |
1da177e4 | 747 | */ |
3d9ea253 | 748 | void dqput(struct dquot *dquot) |
1da177e4 | 749 | { |
b48d3805 JK |
750 | int ret; |
751 | ||
1da177e4 LT |
752 | if (!dquot) |
753 | return; | |
62af9b52 | 754 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 755 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 756 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
757 | quotatypes[dquot->dq_id.type], |
758 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
759 | BUG(); |
760 | } | |
761 | #endif | |
dde95888 | 762 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
763 | we_slept: |
764 | spin_lock(&dq_list_lock); | |
765 | if (atomic_read(&dquot->dq_count) > 1) { | |
766 | /* We have more than one user... nothing to do */ | |
767 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 768 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 769 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 | 770 | atomic_read(&dquot->dq_count) == 1) |
503330f3 | 771 | wake_up(&dquot_ref_wq); |
1da177e4 LT |
772 | spin_unlock(&dq_list_lock); |
773 | return; | |
774 | } | |
775 | /* Need to release dquot? */ | |
4580b30e | 776 | if (dquot_dirty(dquot)) { |
1da177e4 LT |
777 | spin_unlock(&dq_list_lock); |
778 | /* Commit dquot before releasing */ | |
b48d3805 JK |
779 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
780 | if (ret < 0) { | |
fb5ffb0e JZ |
781 | quota_error(dquot->dq_sb, "Can't write quota structure" |
782 | " (error %d). Quota may get out of sync!", | |
783 | ret); | |
b48d3805 JK |
784 | /* |
785 | * We clear dirty bit anyway, so that we avoid | |
786 | * infinite loop here | |
787 | */ | |
b48d3805 | 788 | clear_dquot_dirty(dquot); |
b48d3805 | 789 | } |
1da177e4 LT |
790 | goto we_slept; |
791 | } | |
1da177e4 LT |
792 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
793 | spin_unlock(&dq_list_lock); | |
794 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
795 | goto we_slept; | |
796 | } | |
797 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 798 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 799 | /* sanity check */ |
8abf6a47 | 800 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
801 | #endif |
802 | put_dquot_last(dquot); | |
803 | spin_unlock(&dq_list_lock); | |
804 | } | |
08d0350c | 805 | EXPORT_SYMBOL(dqput); |
1da177e4 | 806 | |
7d9056ba | 807 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
808 | { |
809 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
810 | } | |
7d9056ba | 811 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 812 | |
1da177e4 LT |
813 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
814 | { | |
815 | struct dquot *dquot; | |
816 | ||
74f783af | 817 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 818 | if(!dquot) |
dd6f3c6d | 819 | return NULL; |
1da177e4 | 820 | |
d3be915f | 821 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
822 | INIT_LIST_HEAD(&dquot->dq_free); |
823 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
824 | INIT_HLIST_NODE(&dquot->dq_hash); | |
825 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
826 | dquot->dq_sb = sb; | |
1a06d420 | 827 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 | 828 | atomic_set(&dquot->dq_count, 1); |
7b9ca4c6 | 829 | spin_lock_init(&dquot->dq_dqb_lock); |
1da177e4 LT |
830 | |
831 | return dquot; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Get reference to dquot | |
cc33412f JK |
836 | * |
837 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
838 | * destroying our dquot by: | |
839 | * a) checking for quota flags under dq_list_lock and | |
840 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 841 | */ |
aca645a6 | 842 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 843 | { |
1a06d420 | 844 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 845 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 846 | |
d49d3762 EB |
847 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
848 | return ERR_PTR(-EINVAL); | |
849 | ||
1a06d420 | 850 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 851 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
852 | we_slept: |
853 | spin_lock(&dq_list_lock); | |
cc33412f | 854 | spin_lock(&dq_state_lock); |
1a06d420 | 855 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
856 | spin_unlock(&dq_state_lock); |
857 | spin_unlock(&dq_list_lock); | |
6184fc0b | 858 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
859 | goto out; |
860 | } | |
861 | spin_unlock(&dq_state_lock); | |
862 | ||
1a06d420 | 863 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
864 | if (!dquot) { |
865 | if (!empty) { | |
1da177e4 | 866 | spin_unlock(&dq_list_lock); |
1a06d420 | 867 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 868 | if (!empty) |
1da177e4 LT |
869 | schedule(); /* Try to wait for a moment... */ |
870 | goto we_slept; | |
871 | } | |
872 | dquot = empty; | |
dd6f3c6d | 873 | empty = NULL; |
4c376dca | 874 | dquot->dq_id = qid; |
1da177e4 LT |
875 | /* all dquots go on the inuse_list */ |
876 | put_inuse(dquot); | |
877 | /* hash it first so it can be found */ | |
878 | insert_dquot_hash(dquot); | |
1da177e4 | 879 | spin_unlock(&dq_list_lock); |
dde95888 | 880 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
881 | } else { |
882 | if (!atomic_read(&dquot->dq_count)) | |
883 | remove_free_dquot(dquot); | |
884 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 885 | spin_unlock(&dq_list_lock); |
dde95888 DM |
886 | dqstats_inc(DQST_CACHE_HITS); |
887 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 888 | } |
268157ba JK |
889 | /* Wait for dq_lock - after this we know that either dquot_release() is |
890 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 891 | wait_on_dquot(dquot); |
268157ba | 892 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
893 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
894 | int err; | |
895 | ||
896 | err = sb->dq_op->acquire_dquot(dquot); | |
897 | if (err < 0) { | |
898 | dqput(dquot); | |
899 | dquot = ERR_PTR(err); | |
900 | goto out; | |
901 | } | |
1da177e4 | 902 | } |
044c9b67 JK |
903 | /* |
904 | * Make sure following reads see filled structure - paired with | |
905 | * smp_mb__before_atomic() in dquot_acquire(). | |
906 | */ | |
907 | smp_rmb(); | |
62af9b52 | 908 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 909 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 910 | #endif |
cc33412f JK |
911 | out: |
912 | if (empty) | |
913 | do_destroy_dquot(empty); | |
1da177e4 LT |
914 | |
915 | return dquot; | |
916 | } | |
08d0350c | 917 | EXPORT_SYMBOL(dqget); |
1da177e4 | 918 | |
2d0fa467 JK |
919 | static inline struct dquot **i_dquot(struct inode *inode) |
920 | { | |
2d0fa467 JK |
921 | return inode->i_sb->s_op->get_dquots(inode); |
922 | } | |
923 | ||
1da177e4 LT |
924 | static int dqinit_needed(struct inode *inode, int type) |
925 | { | |
5bcd3b6f | 926 | struct dquot * const *dquots; |
1da177e4 LT |
927 | int cnt; |
928 | ||
929 | if (IS_NOQUOTA(inode)) | |
930 | return 0; | |
5bcd3b6f KK |
931 | |
932 | dquots = i_dquot(inode); | |
1da177e4 | 933 | if (type != -1) |
5bcd3b6f | 934 | return !dquots[type]; |
1da177e4 | 935 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 936 | if (!dquots[cnt]) |
1da177e4 LT |
937 | return 1; |
938 | return 0; | |
939 | } | |
940 | ||
c3b00446 | 941 | /* This routine is guarded by s_umount semaphore */ |
1a6152d3 | 942 | static int add_dquot_ref(struct super_block *sb, int type) |
1da177e4 | 943 | { |
941d2380 | 944 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 945 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 946 | int reserved = 0; |
4c5e6c0e | 947 | #endif |
1a6152d3 | 948 | int err = 0; |
1da177e4 | 949 | |
74278da9 | 950 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 951 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
952 | spin_lock(&inode->i_lock); |
953 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
954 | !atomic_read(&inode->i_writecount) || | |
955 | !dqinit_needed(inode, type)) { | |
956 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 957 | continue; |
250df6ed | 958 | } |
d003fb70 | 959 | __iget(inode); |
250df6ed | 960 | spin_unlock(&inode->i_lock); |
74278da9 | 961 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 962 | |
d7e97117 JK |
963 | #ifdef CONFIG_QUOTA_DEBUG |
964 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
965 | reserved = 1; | |
966 | #endif | |
941d2380 | 967 | iput(old_inode); |
1a6152d3 CY |
968 | err = __dquot_initialize(inode, type); |
969 | if (err) { | |
970 | iput(inode); | |
971 | goto out; | |
972 | } | |
55fa6091 DC |
973 | |
974 | /* | |
975 | * We hold a reference to 'inode' so it couldn't have been | |
976 | * removed from s_inodes list while we dropped the | |
74278da9 | 977 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 978 | * holding the last reference and we cannot iput it under |
74278da9 | 979 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
980 | * later. |
981 | */ | |
941d2380 | 982 | old_inode = inode; |
74278da9 | 983 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 984 | } |
74278da9 | 985 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 986 | iput(old_inode); |
1a6152d3 | 987 | out: |
62af9b52 | 988 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 989 | if (reserved) { |
fb5ffb0e JZ |
990 | quota_error(sb, "Writes happened before quota was turned on " |
991 | "thus quota information is probably inconsistent. " | |
992 | "Please run quotacheck(8)"); | |
0a5a9c72 | 993 | } |
4c5e6c0e | 994 | #endif |
1a6152d3 | 995 | return err; |
1da177e4 LT |
996 | } |
997 | ||
268157ba JK |
998 | /* |
999 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 1000 | * if we have the last reference to dquot |
268157ba | 1001 | */ |
9eb6463f NY |
1002 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
1003 | struct list_head *tofree_head) | |
1da177e4 | 1004 | { |
5bcd3b6f KK |
1005 | struct dquot **dquots = i_dquot(inode); |
1006 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 1007 | |
9eb6463f NY |
1008 | if (!dquot) |
1009 | return; | |
1010 | ||
5bcd3b6f | 1011 | dquots[type] = NULL; |
9eb6463f NY |
1012 | if (list_empty(&dquot->dq_free)) { |
1013 | /* | |
1014 | * The inode still has reference to dquot so it can't be in the | |
1015 | * free list | |
1016 | */ | |
1017 | spin_lock(&dq_list_lock); | |
1018 | list_add(&dquot->dq_free, tofree_head); | |
1019 | spin_unlock(&dq_list_lock); | |
1020 | } else { | |
1021 | /* | |
1022 | * Dquot is already in a list to put so we won't drop the last | |
1023 | * reference here. | |
1024 | */ | |
1025 | dqput(dquot); | |
1da177e4 | 1026 | } |
1da177e4 LT |
1027 | } |
1028 | ||
268157ba JK |
1029 | /* |
1030 | * Free list of dquots | |
1031 | * Dquots are removed from inodes and no new references can be got so we are | |
1032 | * the only ones holding reference | |
1033 | */ | |
1da177e4 LT |
1034 | static void put_dquot_list(struct list_head *tofree_head) |
1035 | { | |
1036 | struct list_head *act_head; | |
1037 | struct dquot *dquot; | |
1038 | ||
1039 | act_head = tofree_head->next; | |
1da177e4 LT |
1040 | while (act_head != tofree_head) { |
1041 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1042 | act_head = act_head->next; | |
268157ba JK |
1043 | /* Remove dquot from the list so we won't have problems... */ |
1044 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1045 | dqput(dquot); |
1046 | } | |
1047 | } | |
1048 | ||
fb58b731 CH |
1049 | static void remove_dquot_ref(struct super_block *sb, int type, |
1050 | struct list_head *tofree_head) | |
1051 | { | |
1052 | struct inode *inode; | |
78bc3334 | 1053 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 | 1054 | int reserved = 0; |
78bc3334 | 1055 | #endif |
fb58b731 | 1056 | |
74278da9 | 1057 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1058 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1059 | /* |
1060 | * We have to scan also I_NEW inodes because they can already | |
1061 | * have quota pointer initialized. Luckily, we need to touch | |
1062 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1063 | * (dq_data_lock). |
aabb8fdb | 1064 | */ |
b9ba6f94 | 1065 | spin_lock(&dq_data_lock); |
7af9cce8 | 1066 | if (!IS_NOQUOTA(inode)) { |
78bc3334 | 1067 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 DM |
1068 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
1069 | reserved = 1; | |
78bc3334 | 1070 | #endif |
fb58b731 | 1071 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1072 | } |
b9ba6f94 | 1073 | spin_unlock(&dq_data_lock); |
fb58b731 | 1074 | } |
74278da9 | 1075 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1076 | #ifdef CONFIG_QUOTA_DEBUG |
1077 | if (reserved) { | |
1078 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1079 | " was disabled thus quota information is probably " | |
1080 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1081 | } | |
1082 | #endif | |
fb58b731 CH |
1083 | } |
1084 | ||
1da177e4 LT |
1085 | /* Gather all references from inodes and drop them */ |
1086 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1087 | { | |
1088 | LIST_HEAD(tofree_head); | |
1089 | ||
fb58b731 | 1090 | if (sb->dq_op) { |
fb58b731 | 1091 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1092 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1093 | put_dquot_list(&tofree_head); |
1094 | } | |
1da177e4 LT |
1095 | } |
1096 | ||
740d9dcd MC |
1097 | static inline |
1098 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1099 | { | |
0a5a9c72 JK |
1100 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1101 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1102 | else { | |
1103 | WARN_ON_ONCE(1); | |
1104 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1105 | } | |
41e327b5 | 1106 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1107 | dquot->dq_dqb.dqb_bsoftlimit) | |
1108 | dquot->dq_dqb.dqb_btime = (time64_t) 0; | |
1109 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
740d9dcd MC |
1110 | } |
1111 | ||
7a2435d8 | 1112 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1113 | { |
db49d2df JK |
1114 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1115 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1116 | dquot->dq_dqb.dqb_curinodes -= number; |
1117 | else | |
1118 | dquot->dq_dqb.dqb_curinodes = 0; | |
1119 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1120 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1121 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1122 | } | |
1123 | ||
7a2435d8 | 1124 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1125 | { |
db49d2df JK |
1126 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1127 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1128 | dquot->dq_dqb.dqb_curspace -= number; |
1129 | else | |
1130 | dquot->dq_dqb.dqb_curspace = 0; | |
41e327b5 | 1131 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1132 | dquot->dq_dqb.dqb_bsoftlimit) | |
e008bb61 | 1133 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1134 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1135 | } | |
1136 | ||
bf097aaf JK |
1137 | struct dquot_warn { |
1138 | struct super_block *w_sb; | |
7b9c7321 | 1139 | struct kqid w_dq_id; |
bf097aaf JK |
1140 | short w_type; |
1141 | }; | |
1142 | ||
c525460e JK |
1143 | static int warning_issued(struct dquot *dquot, const int warntype) |
1144 | { | |
1145 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1146 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1147 | ((warntype == QUOTA_NL_IHARDWARN || | |
1148 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1149 | ||
1150 | if (!flag) | |
1151 | return 0; | |
1152 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1153 | } | |
1154 | ||
8e893469 | 1155 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1156 | static int flag_print_warnings = 1; |
1157 | ||
bf097aaf | 1158 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1159 | { |
1160 | if (!flag_print_warnings) | |
1161 | return 0; | |
1162 | ||
7b9c7321 | 1163 | switch (warn->w_dq_id.type) { |
1da177e4 | 1164 | case USRQUOTA: |
1a06d420 | 1165 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1166 | case GRPQUOTA: |
7b9c7321 | 1167 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1168 | case PRJQUOTA: |
1169 | return 1; | |
1da177e4 LT |
1170 | } |
1171 | return 0; | |
1172 | } | |
1173 | ||
1da177e4 | 1174 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1175 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1176 | { |
1177 | char *msg = NULL; | |
24ec839c | 1178 | struct tty_struct *tty; |
bf097aaf | 1179 | int warntype = warn->w_type; |
1da177e4 | 1180 | |
657d3bfa JK |
1181 | if (warntype == QUOTA_NL_IHARDBELOW || |
1182 | warntype == QUOTA_NL_ISOFTBELOW || | |
1183 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1184 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1185 | return; |
1186 | ||
24ec839c PZ |
1187 | tty = get_current_tty(); |
1188 | if (!tty) | |
452a00d2 | 1189 | return; |
bf097aaf | 1190 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1191 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1192 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1193 | else |
24ec839c | 1194 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1195 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1196 | switch (warntype) { |
8e893469 | 1197 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1198 | msg = " file limit reached.\r\n"; |
1199 | break; | |
8e893469 | 1200 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1201 | msg = " file quota exceeded too long.\r\n"; |
1202 | break; | |
8e893469 | 1203 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1204 | msg = " file quota exceeded.\r\n"; |
1205 | break; | |
8e893469 | 1206 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1207 | msg = " block limit reached.\r\n"; |
1208 | break; | |
8e893469 | 1209 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1210 | msg = " block quota exceeded too long.\r\n"; |
1211 | break; | |
8e893469 | 1212 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1213 | msg = " block quota exceeded.\r\n"; |
1214 | break; | |
1215 | } | |
24ec839c | 1216 | tty_write_message(tty, msg); |
452a00d2 | 1217 | tty_kref_put(tty); |
1da177e4 | 1218 | } |
8e893469 JK |
1219 | #endif |
1220 | ||
bf097aaf JK |
1221 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1222 | int warntype) | |
1223 | { | |
1224 | if (warning_issued(dquot, warntype)) | |
1225 | return; | |
1226 | warn->w_type = warntype; | |
1227 | warn->w_sb = dquot->dq_sb; | |
1228 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1229 | } |
1230 | ||
f18df228 MC |
1231 | /* |
1232 | * Write warnings to the console and send warning messages over netlink. | |
1233 | * | |
bf097aaf | 1234 | * Note that this function can call into tty and networking code. |
f18df228 | 1235 | */ |
bf097aaf | 1236 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1237 | { |
1238 | int i; | |
1239 | ||
86e931a3 | 1240 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1241 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1242 | continue; | |
8e893469 | 1243 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1244 | print_warning(&warn[i]); |
8e893469 | 1245 | #endif |
7b9c7321 | 1246 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1247 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1248 | } |
1da177e4 LT |
1249 | } |
1250 | ||
7a2435d8 | 1251 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1252 | { |
4c376dca | 1253 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1254 | |
1255 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1256 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1257 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1258 | } |
1259 | ||
7b9ca4c6 JK |
1260 | static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, |
1261 | struct dquot_warn *warn) | |
1da177e4 | 1262 | { |
7b9ca4c6 JK |
1263 | qsize_t newinodes; |
1264 | int ret = 0; | |
268157ba | 1265 | |
7b9ca4c6 JK |
1266 | spin_lock(&dquot->dq_dqb_lock); |
1267 | newinodes = dquot->dq_dqb.dqb_curinodes + inodes; | |
4c376dca | 1268 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1269 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
7b9ca4c6 | 1270 | goto add; |
1da177e4 LT |
1271 | |
1272 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1273 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1274 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1275 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
7b9ca4c6 JK |
1276 | ret = -EDQUOT; |
1277 | goto out; | |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1281 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1282 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1283 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1284 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1285 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
7b9ca4c6 JK |
1286 | ret = -EDQUOT; |
1287 | goto out; | |
1da177e4 LT |
1288 | } |
1289 | ||
1290 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1291 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1292 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1293 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1294 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1295 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 | 1296 | } |
7b9ca4c6 JK |
1297 | add: |
1298 | dquot->dq_dqb.dqb_curinodes = newinodes; | |
1da177e4 | 1299 | |
7b9ca4c6 JK |
1300 | out: |
1301 | spin_unlock(&dquot->dq_dqb_lock); | |
1302 | return ret; | |
1da177e4 LT |
1303 | } |
1304 | ||
7b9ca4c6 JK |
1305 | static int dquot_add_space(struct dquot *dquot, qsize_t space, |
1306 | qsize_t rsv_space, unsigned int flags, | |
1307 | struct dquot_warn *warn) | |
1da177e4 | 1308 | { |
f18df228 | 1309 | qsize_t tspace; |
268157ba | 1310 | struct super_block *sb = dquot->dq_sb; |
7b9ca4c6 | 1311 | int ret = 0; |
f18df228 | 1312 | |
7b9ca4c6 | 1313 | spin_lock(&dquot->dq_dqb_lock); |
4c376dca | 1314 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1315 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
ac3d7939 | 1316 | goto finish; |
1da177e4 | 1317 | |
f18df228 | 1318 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
7b9ca4c6 JK |
1319 | + space + rsv_space; |
1320 | ||
1da177e4 | 1321 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1322 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 | 1323 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1324 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1325 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
7b9ca4c6 | 1326 | ret = -EDQUOT; |
ac3d7939 | 1327 | goto finish; |
1da177e4 LT |
1328 | } |
1329 | ||
1330 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1331 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1332 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1333 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 | 1334 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1335 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1336 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
7b9ca4c6 | 1337 | ret = -EDQUOT; |
ac3d7939 | 1338 | goto finish; |
1da177e4 LT |
1339 | } |
1340 | ||
1341 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1342 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 | 1343 | dquot->dq_dqb.dqb_btime == 0) { |
7b9ca4c6 | 1344 | if (flags & DQUOT_SPACE_WARN) { |
bf097aaf | 1345 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1346 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1347 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
7b9ca4c6 | 1348 | } else { |
1da177e4 LT |
1349 | /* |
1350 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1351 | * be always printed | |
1352 | */ | |
7b9ca4c6 | 1353 | ret = -EDQUOT; |
ac3d7939 | 1354 | goto finish; |
7b9ca4c6 | 1355 | } |
1da177e4 | 1356 | } |
ac3d7939 JK |
1357 | finish: |
1358 | /* | |
1359 | * We have to be careful and go through warning generation & grace time | |
1360 | * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it | |
1361 | * only here... | |
1362 | */ | |
1363 | if (flags & DQUOT_SPACE_NOFAIL) | |
1364 | ret = 0; | |
1365 | if (!ret) { | |
1366 | dquot->dq_dqb.dqb_rsvspace += rsv_space; | |
1367 | dquot->dq_dqb.dqb_curspace += space; | |
1368 | } | |
7b9ca4c6 JK |
1369 | spin_unlock(&dquot->dq_dqb_lock); |
1370 | return ret; | |
1da177e4 LT |
1371 | } |
1372 | ||
12095460 | 1373 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1374 | { |
268157ba JK |
1375 | qsize_t newinodes; |
1376 | ||
657d3bfa | 1377 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1378 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1379 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1380 | return QUOTA_NL_NOWARN; |
1381 | ||
268157ba JK |
1382 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1383 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1384 | return QUOTA_NL_ISOFTBELOW; |
1385 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1386 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1387 | return QUOTA_NL_IHARDBELOW; |
1388 | return QUOTA_NL_NOWARN; | |
1389 | } | |
1390 | ||
1391 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1392 | { | |
41e327b5 | 1393 | qsize_t tspace; |
1394 | ||
1395 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; | |
1396 | ||
657d3bfa | 1397 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
41e327b5 | 1398 | tspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1399 | return QUOTA_NL_NOWARN; |
1400 | ||
41e327b5 | 1401 | if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1402 | return QUOTA_NL_BSOFTBELOW; |
41e327b5 | 1403 | if (tspace >= dquot->dq_dqb.dqb_bhardlimit && |
1404 | tspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1405 | return QUOTA_NL_BHARDBELOW; |
1406 | return QUOTA_NL_NOWARN; | |
1407 | } | |
0a5a9c72 | 1408 | |
189eef59 CH |
1409 | static int dquot_active(const struct inode *inode) |
1410 | { | |
1411 | struct super_block *sb = inode->i_sb; | |
1412 | ||
1413 | if (IS_NOQUOTA(inode)) | |
1414 | return 0; | |
1415 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1416 | } | |
1417 | ||
1da177e4 | 1418 | /* |
871a2931 CH |
1419 | * Initialize quota pointers in inode |
1420 | * | |
871a2931 CH |
1421 | * It is better to call this function outside of any transaction as it |
1422 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1423 | */ |
6184fc0b | 1424 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1425 | { |
1ea06bec | 1426 | int cnt, init_needed = 0; |
ab73ef46 | 1427 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1428 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1429 | qsize_t rsv; |
6184fc0b | 1430 | int ret = 0; |
1da177e4 | 1431 | |
189eef59 | 1432 | if (!dquot_active(inode)) |
6184fc0b | 1433 | return 0; |
cc33412f | 1434 | |
5bcd3b6f KK |
1435 | dquots = i_dquot(inode); |
1436 | ||
cc33412f JK |
1437 | /* First get references to structures we might need. */ |
1438 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1439 | struct kqid qid; |
847aac64 LX |
1440 | kprojid_t projid; |
1441 | int rc; | |
6184fc0b | 1442 | struct dquot *dquot; |
847aac64 | 1443 | |
cc33412f JK |
1444 | if (type != -1 && cnt != type) |
1445 | continue; | |
1ea06bec NY |
1446 | /* |
1447 | * The i_dquot should have been initialized in most cases, | |
1448 | * we check it without locking here to avoid unnecessary | |
1449 | * dqget()/dqput() calls. | |
1450 | */ | |
5bcd3b6f | 1451 | if (dquots[cnt]) |
1ea06bec | 1452 | continue; |
847aac64 LX |
1453 | |
1454 | if (!sb_has_quota_active(sb, cnt)) | |
1455 | continue; | |
1456 | ||
1ea06bec NY |
1457 | init_needed = 1; |
1458 | ||
cc33412f JK |
1459 | switch (cnt) { |
1460 | case USRQUOTA: | |
aca645a6 | 1461 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1462 | break; |
1463 | case GRPQUOTA: | |
aca645a6 | 1464 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1465 | break; |
847aac64 LX |
1466 | case PRJQUOTA: |
1467 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1468 | if (rc) | |
1469 | continue; | |
1470 | qid = make_kqid_projid(projid); | |
1471 | break; | |
cc33412f | 1472 | } |
6184fc0b JK |
1473 | dquot = dqget(sb, qid); |
1474 | if (IS_ERR(dquot)) { | |
1475 | /* We raced with somebody turning quotas off... */ | |
1476 | if (PTR_ERR(dquot) != -ESRCH) { | |
1477 | ret = PTR_ERR(dquot); | |
1478 | goto out_put; | |
1479 | } | |
1480 | dquot = NULL; | |
1481 | } | |
1482 | got[cnt] = dquot; | |
cc33412f JK |
1483 | } |
1484 | ||
1ea06bec NY |
1485 | /* All required i_dquot has been initialized */ |
1486 | if (!init_needed) | |
6184fc0b | 1487 | return 0; |
1ea06bec | 1488 | |
b9ba6f94 | 1489 | spin_lock(&dq_data_lock); |
1da177e4 | 1490 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1491 | goto out_lock; |
1da177e4 LT |
1492 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1493 | if (type != -1 && cnt != type) | |
1494 | continue; | |
cc33412f JK |
1495 | /* Avoid races with quotaoff() */ |
1496 | if (!sb_has_quota_active(sb, cnt)) | |
1497 | continue; | |
4408ea41 JK |
1498 | /* We could race with quotaon or dqget() could have failed */ |
1499 | if (!got[cnt]) | |
1500 | continue; | |
5bcd3b6f KK |
1501 | if (!dquots[cnt]) { |
1502 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1503 | got[cnt] = NULL; |
0a5a9c72 JK |
1504 | /* |
1505 | * Make quota reservation system happy if someone | |
1506 | * did a write before quota was turned on | |
1507 | */ | |
1508 | rsv = inode_get_rsv_space(inode); | |
7b9ca4c6 JK |
1509 | if (unlikely(rsv)) { |
1510 | spin_lock(&inode->i_lock); | |
1511 | /* Get reservation again under proper lock */ | |
1512 | rsv = __inode_get_rsv_space(inode); | |
1513 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1514 | dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; | |
1515 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1516 | spin_unlock(&inode->i_lock); | |
1517 | } | |
1da177e4 LT |
1518 | } |
1519 | } | |
6184fc0b | 1520 | out_lock: |
b9ba6f94 | 1521 | spin_unlock(&dq_data_lock); |
6184fc0b | 1522 | out_put: |
cc33412f | 1523 | /* Drop unused references */ |
dc52dd3a | 1524 | dqput_all(got); |
6184fc0b JK |
1525 | |
1526 | return ret; | |
871a2931 CH |
1527 | } |
1528 | ||
6184fc0b | 1529 | int dquot_initialize(struct inode *inode) |
871a2931 | 1530 | { |
6184fc0b | 1531 | return __dquot_initialize(inode, -1); |
1da177e4 | 1532 | } |
08d0350c | 1533 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1534 | |
b8cb5a54 TE |
1535 | bool dquot_initialize_needed(struct inode *inode) |
1536 | { | |
1537 | struct dquot **dquots; | |
1538 | int i; | |
1539 | ||
1540 | if (!dquot_active(inode)) | |
1541 | return false; | |
1542 | ||
1543 | dquots = i_dquot(inode); | |
1544 | for (i = 0; i < MAXQUOTAS; i++) | |
1545 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1546 | return true; | |
1547 | return false; | |
1548 | } | |
1549 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1550 | ||
1da177e4 | 1551 | /* |
b9ba6f94 NY |
1552 | * Release all quotas referenced by inode. |
1553 | * | |
1554 | * This function only be called on inode free or converting | |
1555 | * a file to quota file, no other users for the i_dquot in | |
1556 | * both cases, so we needn't call synchronize_srcu() after | |
1557 | * clearing i_dquot. | |
1da177e4 | 1558 | */ |
9f754758 | 1559 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1560 | { |
1561 | int cnt; | |
5bcd3b6f | 1562 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1563 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1564 | |
b9ba6f94 | 1565 | spin_lock(&dq_data_lock); |
1da177e4 | 1566 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1567 | put[cnt] = dquots[cnt]; |
1568 | dquots[cnt] = NULL; | |
1da177e4 | 1569 | } |
b9ba6f94 | 1570 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1571 | dqput_all(put); |
1da177e4 LT |
1572 | } |
1573 | ||
9f754758 CH |
1574 | void dquot_drop(struct inode *inode) |
1575 | { | |
5bcd3b6f | 1576 | struct dquot * const *dquots; |
9f754758 CH |
1577 | int cnt; |
1578 | ||
1579 | if (IS_NOQUOTA(inode)) | |
1580 | return; | |
1581 | ||
1582 | /* | |
1583 | * Test before calling to rule out calls from proc and such | |
1584 | * where we are not allowed to block. Note that this is | |
1585 | * actually reliable test even without the lock - the caller | |
1586 | * must assure that nobody can come after the DQUOT_DROP and | |
1587 | * add quota pointers back anyway. | |
1588 | */ | |
5bcd3b6f | 1589 | dquots = i_dquot(inode); |
9f754758 | 1590 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1591 | if (dquots[cnt]) |
9f754758 CH |
1592 | break; |
1593 | } | |
1594 | ||
1595 | if (cnt < MAXQUOTAS) | |
1596 | __dquot_drop(inode); | |
1597 | } | |
1598 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1599 | |
fd8fbfc1 DM |
1600 | /* |
1601 | * inode_reserved_space is managed internally by quota, and protected by | |
1602 | * i_lock similar to i_blocks+i_bytes. | |
1603 | */ | |
1604 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1605 | { | |
1606 | /* Filesystem must explicitly define it's own method in order to use | |
1607 | * quota reservation interface */ | |
1608 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1609 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1610 | } | |
1611 | ||
7b9ca4c6 | 1612 | static qsize_t __inode_get_rsv_space(struct inode *inode) |
fd8fbfc1 | 1613 | { |
7b9ca4c6 JK |
1614 | if (!inode->i_sb->dq_op->get_reserved_space) |
1615 | return 0; | |
1616 | return *inode_reserved_space(inode); | |
fd8fbfc1 DM |
1617 | } |
1618 | ||
1619 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1620 | { | |
1621 | qsize_t ret; | |
05b5d898 JK |
1622 | |
1623 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1624 | return 0; | |
fd8fbfc1 | 1625 | spin_lock(&inode->i_lock); |
7b9ca4c6 | 1626 | ret = __inode_get_rsv_space(inode); |
fd8fbfc1 DM |
1627 | spin_unlock(&inode->i_lock); |
1628 | return ret; | |
1629 | } | |
1630 | ||
1da177e4 | 1631 | /* |
5dd4056d CH |
1632 | * This functions updates i_blocks+i_bytes fields and quota information |
1633 | * (together with appropriate checks). | |
1634 | * | |
1635 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1636 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1637 | * the current transaction so that dquot write and inode write go into the | |
1638 | * same transaction. | |
1da177e4 LT |
1639 | */ |
1640 | ||
1641 | /* | |
1642 | * This operation can block, but only after everything is updated | |
1643 | */ | |
56246f9a | 1644 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1645 | { |
b9ba6f94 | 1646 | int cnt, ret = 0, index; |
bf097aaf | 1647 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1648 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1649 | struct dquot **dquots; |
1da177e4 | 1650 | |
189eef59 | 1651 | if (!dquot_active(inode)) { |
a478e522 JK |
1652 | if (reserve) { |
1653 | spin_lock(&inode->i_lock); | |
1654 | *inode_reserved_space(inode) += number; | |
1655 | spin_unlock(&inode->i_lock); | |
1656 | } else { | |
1657 | inode_add_bytes(inode, number); | |
1658 | } | |
fd8fbfc1 DM |
1659 | goto out; |
1660 | } | |
1661 | ||
1da177e4 | 1662 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1663 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1664 | |
5bcd3b6f | 1665 | dquots = i_dquot(inode); |
b9ba6f94 | 1666 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1667 | spin_lock(&inode->i_lock); |
1da177e4 | 1668 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1669 | if (!dquots[cnt]) |
1da177e4 | 1670 | continue; |
df15a2a5 | 1671 | if (reserve) { |
7b9ca4c6 JK |
1672 | ret = dquot_add_space(dquots[cnt], 0, number, flags, |
1673 | &warn[cnt]); | |
1674 | } else { | |
1675 | ret = dquot_add_space(dquots[cnt], number, 0, flags, | |
1676 | &warn[cnt]); | |
1677 | } | |
1678 | if (ret) { | |
1679 | /* Back out changes we already did */ | |
1680 | for (cnt--; cnt >= 0; cnt--) { | |
1681 | if (!dquots[cnt]) | |
1682 | continue; | |
1683 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a CX |
1684 | if (reserve) |
1685 | dquot_free_reserved_space(dquots[cnt], | |
1686 | number); | |
1687 | else | |
1688 | dquot_decr_space(dquots[cnt], number); | |
7b9ca4c6 JK |
1689 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1690 | } | |
1691 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 | 1692 | goto out_flush_warn; |
f18df228 | 1693 | } |
1da177e4 | 1694 | } |
7b9ca4c6 | 1695 | if (reserve) |
a478e522 | 1696 | *inode_reserved_space(inode) += number; |
7b9ca4c6 JK |
1697 | else |
1698 | __inode_add_bytes(inode, number); | |
1699 | spin_unlock(&inode->i_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); |
7b9ca4c6 | 1728 | spin_lock(&inode->i_lock); |
1da177e4 | 1729 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1730 | if (!dquots[cnt]) |
1da177e4 | 1731 | continue; |
7b9ca4c6 JK |
1732 | ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); |
1733 | if (ret) { | |
1734 | for (cnt--; cnt >= 0; cnt--) { | |
1735 | if (!dquots[cnt]) | |
1736 | continue; | |
1737 | /* Back out changes we already did */ | |
1738 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a | 1739 | dquot_decr_inodes(dquots[cnt], 1); |
7b9ca4c6 JK |
1740 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1741 | } | |
1da177e4 | 1742 | goto warn_put_all; |
7b9ca4c6 | 1743 | } |
1da177e4 | 1744 | } |
efd8f0e6 | 1745 | |
1da177e4 | 1746 | warn_put_all: |
7b9ca4c6 | 1747 | spin_unlock(&inode->i_lock); |
63936dda | 1748 | if (ret == 0) |
bf097aaf | 1749 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1750 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1751 | flush_warnings(warn); |
1da177e4 LT |
1752 | return ret; |
1753 | } | |
08d0350c | 1754 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1755 | |
5dd4056d CH |
1756 | /* |
1757 | * Convert in-memory reserved quotas to real consumed quotas | |
1758 | */ | |
1759 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1760 | { |
5bcd3b6f | 1761 | struct dquot **dquots; |
b9ba6f94 | 1762 | int cnt, index; |
740d9dcd | 1763 | |
189eef59 | 1764 | if (!dquot_active(inode)) { |
0ed60de3 JK |
1765 | spin_lock(&inode->i_lock); |
1766 | *inode_reserved_space(inode) -= number; | |
1767 | __inode_add_bytes(inode, number); | |
1768 | spin_unlock(&inode->i_lock); | |
5dd4056d | 1769 | return 0; |
740d9dcd MC |
1770 | } |
1771 | ||
5bcd3b6f | 1772 | dquots = i_dquot(inode); |
b9ba6f94 | 1773 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1774 | spin_lock(&inode->i_lock); |
740d9dcd MC |
1775 | /* Claim reserved quotas to allocated quotas */ |
1776 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1777 | if (dquots[cnt]) { |
1778 | struct dquot *dquot = dquots[cnt]; | |
1779 | ||
7b9ca4c6 | 1780 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1781 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) |
1782 | number = dquot->dq_dqb.dqb_rsvspace; | |
1783 | dquot->dq_dqb.dqb_curspace += number; | |
1784 | dquot->dq_dqb.dqb_rsvspace -= number; | |
7b9ca4c6 | 1785 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1786 | } |
740d9dcd MC |
1787 | } |
1788 | /* Update inode bytes */ | |
0ed60de3 JK |
1789 | *inode_reserved_space(inode) -= number; |
1790 | __inode_add_bytes(inode, number); | |
1791 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1792 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1793 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1794 | return 0; |
740d9dcd | 1795 | } |
5dd4056d | 1796 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1797 | |
1c8924eb JK |
1798 | /* |
1799 | * Convert allocated space back to in-memory reserved quotas | |
1800 | */ | |
1801 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1802 | { | |
5bcd3b6f | 1803 | struct dquot **dquots; |
b9ba6f94 | 1804 | int cnt, index; |
1c8924eb JK |
1805 | |
1806 | if (!dquot_active(inode)) { | |
0ed60de3 JK |
1807 | spin_lock(&inode->i_lock); |
1808 | *inode_reserved_space(inode) += number; | |
1809 | __inode_sub_bytes(inode, number); | |
1810 | spin_unlock(&inode->i_lock); | |
1c8924eb JK |
1811 | return; |
1812 | } | |
1813 | ||
5bcd3b6f | 1814 | dquots = i_dquot(inode); |
b9ba6f94 | 1815 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1816 | spin_lock(&inode->i_lock); |
1c8924eb JK |
1817 | /* Claim reserved quotas to allocated quotas */ |
1818 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1819 | if (dquots[cnt]) { |
1820 | struct dquot *dquot = dquots[cnt]; | |
1821 | ||
7b9ca4c6 | 1822 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1823 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) |
1824 | number = dquot->dq_dqb.dqb_curspace; | |
1825 | dquot->dq_dqb.dqb_rsvspace += number; | |
1826 | dquot->dq_dqb.dqb_curspace -= number; | |
7b9ca4c6 | 1827 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1828 | } |
1c8924eb JK |
1829 | } |
1830 | /* Update inode bytes */ | |
0ed60de3 JK |
1831 | *inode_reserved_space(inode) += number; |
1832 | __inode_sub_bytes(inode, number); | |
1833 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1834 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1835 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1836 | return; |
1837 | } | |
1838 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1839 | ||
1da177e4 LT |
1840 | /* |
1841 | * This operation can block, but only after everything is updated | |
1842 | */ | |
56246f9a | 1843 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1844 | { |
1845 | unsigned int cnt; | |
bf097aaf | 1846 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1847 | struct dquot **dquots; |
b9ba6f94 | 1848 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1849 | |
189eef59 | 1850 | if (!dquot_active(inode)) { |
a478e522 JK |
1851 | if (reserve) { |
1852 | spin_lock(&inode->i_lock); | |
1853 | *inode_reserved_space(inode) -= number; | |
1854 | spin_unlock(&inode->i_lock); | |
1855 | } else { | |
1856 | inode_sub_bytes(inode, number); | |
1857 | } | |
5dd4056d | 1858 | return; |
1da177e4 | 1859 | } |
657d3bfa | 1860 | |
5bcd3b6f | 1861 | dquots = i_dquot(inode); |
b9ba6f94 | 1862 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1863 | spin_lock(&inode->i_lock); |
1da177e4 | 1864 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1865 | int wtype; |
1866 | ||
1867 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1868 | if (!dquots[cnt]) | |
1da177e4 | 1869 | continue; |
7b9ca4c6 | 1870 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1871 | wtype = info_bdq_free(dquots[cnt], number); |
1872 | if (wtype != QUOTA_NL_NOWARN) | |
1873 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1874 | if (reserve) |
bf097aaf | 1875 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1876 | else |
bf097aaf | 1877 | dquot_decr_space(dquots[cnt], number); |
7b9ca4c6 | 1878 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1879 | } |
7b9ca4c6 | 1880 | if (reserve) |
a478e522 | 1881 | *inode_reserved_space(inode) -= number; |
7b9ca4c6 JK |
1882 | else |
1883 | __inode_sub_bytes(inode, number); | |
1884 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 DM |
1885 | |
1886 | if (reserve) | |
1887 | goto out_unlock; | |
bf097aaf | 1888 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1889 | out_unlock: |
b9ba6f94 | 1890 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1891 | flush_warnings(warn); |
fd8fbfc1 | 1892 | } |
5dd4056d | 1893 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1894 | |
1da177e4 LT |
1895 | /* |
1896 | * This operation can block, but only after everything is updated | |
1897 | */ | |
6bab3596 | 1898 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1899 | { |
1900 | unsigned int cnt; | |
bf097aaf | 1901 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1902 | struct dquot * const *dquots; |
b9ba6f94 | 1903 | int index; |
1da177e4 | 1904 | |
189eef59 | 1905 | if (!dquot_active(inode)) |
63936dda | 1906 | return; |
657d3bfa | 1907 | |
5bcd3b6f | 1908 | dquots = i_dquot(inode); |
b9ba6f94 | 1909 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1910 | spin_lock(&inode->i_lock); |
1da177e4 | 1911 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1912 | int wtype; |
1913 | ||
1914 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1915 | if (!dquots[cnt]) | |
1da177e4 | 1916 | continue; |
7b9ca4c6 | 1917 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1918 | wtype = info_idq_free(dquots[cnt], 1); |
1919 | if (wtype != QUOTA_NL_NOWARN) | |
1920 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1921 | dquot_decr_inodes(dquots[cnt], 1); | |
7b9ca4c6 | 1922 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1923 | } |
7b9ca4c6 | 1924 | spin_unlock(&inode->i_lock); |
bf097aaf | 1925 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1926 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1927 | flush_warnings(warn); |
1da177e4 | 1928 | } |
08d0350c | 1929 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1930 | |
1931 | /* | |
1932 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1933 | * On success, dquot references in transfer_to are consumed and references |
1934 | * to original dquots that need to be released are placed there. On failure, | |
1935 | * references are kept untouched. | |
1da177e4 LT |
1936 | * |
1937 | * This operation can block, but only after everything is updated | |
1938 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1939 | * |
b9ba6f94 NY |
1940 | * We are holding reference on transfer_from & transfer_to, no need to |
1941 | * protect them by srcu_read_lock(). | |
1da177e4 | 1942 | */ |
bc8e5f07 | 1943 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1944 | { |
7b9ca4c6 | 1945 | qsize_t cur_space; |
740d9dcd | 1946 | qsize_t rsv_space = 0; |
7a9ca53a | 1947 | qsize_t inode_usage = 1; |
bc8e5f07 | 1948 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1949 | int cnt, ret = 0; |
9e32784b | 1950 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1951 | struct dquot_warn warn_to[MAXQUOTAS]; |
1952 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1953 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1954 | |
1da177e4 | 1955 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1956 | return 0; |
7a9ca53a TE |
1957 | |
1958 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1959 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1960 | if (ret) | |
1961 | return ret; | |
1962 | } | |
1963 | ||
cc33412f | 1964 | /* Initialize the arrays */ |
bf097aaf JK |
1965 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1966 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1967 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1968 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1969 | } | |
b9ba6f94 NY |
1970 | |
1971 | spin_lock(&dq_data_lock); | |
7b9ca4c6 | 1972 | spin_lock(&inode->i_lock); |
cc33412f | 1973 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
7b9ca4c6 | 1974 | spin_unlock(&inode->i_lock); |
b9ba6f94 | 1975 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1976 | return 0; |
cc33412f | 1977 | } |
7b9ca4c6 JK |
1978 | cur_space = __inode_get_bytes(inode); |
1979 | rsv_space = __inode_get_rsv_space(inode); | |
1980 | /* | |
1981 | * Build the transfer_from list, check limits, and update usage in | |
1982 | * the target structures. | |
1983 | */ | |
1da177e4 | 1984 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b D |
1985 | /* |
1986 | * Skip changes for same uid or gid or for turned off quota-type. | |
1987 | */ | |
dd6f3c6d | 1988 | if (!transfer_to[cnt]) |
1da177e4 | 1989 | continue; |
9e32784b D |
1990 | /* Avoid races with quotaoff() */ |
1991 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1992 | continue; | |
1993 | is_valid[cnt] = 1; | |
2d0fa467 | 1994 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7b9ca4c6 JK |
1995 | ret = dquot_add_inodes(transfer_to[cnt], inode_usage, |
1996 | &warn_to[cnt]); | |
efd8f0e6 CH |
1997 | if (ret) |
1998 | goto over_quota; | |
7b9ca4c6 JK |
1999 | ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 0, |
2000 | &warn_to[cnt]); | |
2001 | if (ret) { | |
0a51fb71 | 2002 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); |
7b9ca4c6 | 2003 | dquot_decr_inodes(transfer_to[cnt], inode_usage); |
0a51fb71 | 2004 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); |
cc33412f | 2005 | goto over_quota; |
7b9ca4c6 | 2006 | } |
1da177e4 LT |
2007 | } |
2008 | ||
7b9ca4c6 | 2009 | /* Decrease usage for source structures and update quota pointers */ |
1da177e4 | 2010 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b | 2011 | if (!is_valid[cnt]) |
1da177e4 | 2012 | continue; |
1da177e4 LT |
2013 | /* Due to IO error we might not have transfer_from[] structure */ |
2014 | if (transfer_from[cnt]) { | |
bf097aaf | 2015 | int wtype; |
7b9ca4c6 JK |
2016 | |
2017 | spin_lock(&transfer_from[cnt]->dq_dqb_lock); | |
7a9ca53a | 2018 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
2019 | if (wtype != QUOTA_NL_NOWARN) |
2020 | prepare_warning(&warn_from_inodes[cnt], | |
2021 | transfer_from[cnt], wtype); | |
7b9ca4c6 JK |
2022 | wtype = info_bdq_free(transfer_from[cnt], |
2023 | cur_space + rsv_space); | |
bf097aaf JK |
2024 | if (wtype != QUOTA_NL_NOWARN) |
2025 | prepare_warning(&warn_from_space[cnt], | |
2026 | transfer_from[cnt], wtype); | |
7a9ca53a | 2027 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
2028 | dquot_decr_space(transfer_from[cnt], cur_space); |
2029 | dquot_free_reserved_space(transfer_from[cnt], | |
2030 | rsv_space); | |
7b9ca4c6 | 2031 | spin_unlock(&transfer_from[cnt]->dq_dqb_lock); |
1da177e4 | 2032 | } |
2d0fa467 | 2033 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 2034 | } |
7b9ca4c6 | 2035 | spin_unlock(&inode->i_lock); |
1da177e4 | 2036 | spin_unlock(&dq_data_lock); |
cc33412f | 2037 | |
dc52dd3a DM |
2038 | mark_all_dquot_dirty(transfer_from); |
2039 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
2040 | flush_warnings(warn_to); |
2041 | flush_warnings(warn_from_inodes); | |
2042 | flush_warnings(warn_from_space); | |
bc8e5f07 | 2043 | /* Pass back references to put */ |
dc52dd3a | 2044 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
2045 | if (is_valid[cnt]) |
2046 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 2047 | return 0; |
cc33412f | 2048 | over_quota: |
7b9ca4c6 JK |
2049 | /* Back out changes we already did */ |
2050 | for (cnt--; cnt >= 0; cnt--) { | |
2051 | if (!is_valid[cnt]) | |
2052 | continue; | |
2053 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); | |
2054 | dquot_decr_inodes(transfer_to[cnt], inode_usage); | |
2055 | dquot_decr_space(transfer_to[cnt], cur_space); | |
2056 | dquot_free_reserved_space(transfer_to[cnt], rsv_space); | |
2057 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); | |
2058 | } | |
2059 | spin_unlock(&inode->i_lock); | |
cc33412f | 2060 | spin_unlock(&dq_data_lock); |
bf097aaf | 2061 | flush_warnings(warn_to); |
86f3cbec | 2062 | return ret; |
1da177e4 | 2063 | } |
bc8e5f07 | 2064 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2065 | |
8ddd69d6 DM |
2066 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2067 | * Called from FSXXX_setattr() | |
2068 | */ | |
b43fa828 | 2069 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2070 | { |
bc8e5f07 | 2071 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2072 | struct dquot *dquot; |
bc8e5f07 JK |
2073 | struct super_block *sb = inode->i_sb; |
2074 | int ret; | |
8ddd69d6 | 2075 | |
189eef59 | 2076 | if (!dquot_active(inode)) |
bc8e5f07 | 2077 | return 0; |
12755627 | 2078 | |
6184fc0b JK |
2079 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2080 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2081 | if (IS_ERR(dquot)) { | |
2082 | if (PTR_ERR(dquot) != -ESRCH) { | |
2083 | ret = PTR_ERR(dquot); | |
2084 | goto out_put; | |
2085 | } | |
2086 | dquot = NULL; | |
2087 | } | |
2088 | transfer_to[USRQUOTA] = dquot; | |
2089 | } | |
2090 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2091 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2092 | if (IS_ERR(dquot)) { | |
2093 | if (PTR_ERR(dquot) != -ESRCH) { | |
2094 | ret = PTR_ERR(dquot); | |
2095 | goto out_put; | |
2096 | } | |
2097 | dquot = NULL; | |
2098 | } | |
2099 | transfer_to[GRPQUOTA] = dquot; | |
2100 | } | |
bc8e5f07 | 2101 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2102 | out_put: |
bc8e5f07 JK |
2103 | dqput_all(transfer_to); |
2104 | return ret; | |
b85f4b87 | 2105 | } |
b43fa828 | 2106 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2107 | |
1da177e4 LT |
2108 | /* |
2109 | * Write info of quota file to disk | |
2110 | */ | |
2111 | int dquot_commit_info(struct super_block *sb, int type) | |
2112 | { | |
1da177e4 LT |
2113 | struct quota_info *dqopt = sb_dqopt(sb); |
2114 | ||
9a8ae30e | 2115 | return dqopt->ops[type]->write_file_info(sb, type); |
1da177e4 | 2116 | } |
08d0350c | 2117 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2118 | |
be6257b2 JK |
2119 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2120 | { | |
2121 | struct quota_info *dqopt = sb_dqopt(sb); | |
be6257b2 | 2122 | |
9d1ccbe7 JK |
2123 | if (!sb_has_quota_active(sb, qid->type)) |
2124 | return -ESRCH; | |
2125 | if (!dqopt->ops[qid->type]->get_next_id) | |
2126 | return -ENOSYS; | |
f14618c6 | 2127 | return dqopt->ops[qid->type]->get_next_id(sb, qid); |
be6257b2 JK |
2128 | } |
2129 | EXPORT_SYMBOL(dquot_get_next_id); | |
2130 | ||
1da177e4 LT |
2131 | /* |
2132 | * Definitions of diskquota operations. | |
2133 | */ | |
61e225dc | 2134 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2135 | .write_dquot = dquot_commit, |
2136 | .acquire_dquot = dquot_acquire, | |
2137 | .release_dquot = dquot_release, | |
2138 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2139 | .write_info = dquot_commit_info, |
2140 | .alloc_dquot = dquot_alloc, | |
2141 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2142 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2143 | }; |
123e9caf | 2144 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2145 | |
907f4554 CH |
2146 | /* |
2147 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2148 | */ | |
2149 | int dquot_file_open(struct inode *inode, struct file *file) | |
2150 | { | |
2151 | int error; | |
2152 | ||
2153 | error = generic_file_open(inode, file); | |
2154 | if (!error && (file->f_mode & FMODE_WRITE)) | |
88d8ff97 | 2155 | error = dquot_initialize(inode); |
907f4554 CH |
2156 | return error; |
2157 | } | |
2158 | EXPORT_SYMBOL(dquot_file_open); | |
2159 | ||
1da177e4 LT |
2160 | /* |
2161 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2162 | */ | |
0f0dd62f | 2163 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2164 | { |
0ff5af83 | 2165 | int cnt, ret = 0; |
1da177e4 LT |
2166 | struct quota_info *dqopt = sb_dqopt(sb); |
2167 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2168 | |
7d6cd73d JK |
2169 | /* s_umount should be held in exclusive mode */ |
2170 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2171 | up_read(&sb->s_umount); | |
2172 | ||
f55abc0f JK |
2173 | /* Cannot turn off usage accounting without turning off limits, or |
2174 | * suspend quotas and simultaneously turn quotas off. */ | |
2175 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2176 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2177 | DQUOT_USAGE_ENABLED))) | |
2178 | return -EINVAL; | |
2179 | ||
9377abd0 JK |
2180 | /* |
2181 | * Skip everything if there's nothing to do. We have to do this because | |
2182 | * sometimes we are called when fill_super() failed and calling | |
2183 | * sync_fs() in such cases does no good. | |
2184 | */ | |
c3b00446 | 2185 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2186 | return 0; |
c3b00446 | 2187 | |
1da177e4 LT |
2188 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2189 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2190 | if (type != -1 && cnt != type) |
2191 | continue; | |
f55abc0f | 2192 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2193 | continue; |
f55abc0f JK |
2194 | |
2195 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2196 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2197 | dqopt->flags |= |
2198 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2199 | spin_unlock(&dq_state_lock); |
f55abc0f | 2200 | } else { |
cc33412f | 2201 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2202 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2203 | /* Turning off suspended quotas? */ | |
2204 | if (!sb_has_quota_loaded(sb, cnt) && | |
2205 | sb_has_quota_suspended(sb, cnt)) { | |
2206 | dqopt->flags &= ~dquot_state_flag( | |
2207 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2208 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2209 | iput(dqopt->files[cnt]); |
2210 | dqopt->files[cnt] = NULL; | |
2211 | continue; | |
2212 | } | |
cc33412f | 2213 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2214 | } |
f55abc0f JK |
2215 | |
2216 | /* We still have to keep quota loaded? */ | |
2217 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2218 | continue; |
1da177e4 LT |
2219 | |
2220 | /* Note: these are blocking operations */ | |
2221 | drop_dquot_ref(sb, cnt); | |
2222 | invalidate_dquots(sb, cnt); | |
2223 | /* | |
268157ba JK |
2224 | * Now all dquots should be invalidated, all writes done so we |
2225 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2226 | */ |
2227 | if (info_dirty(&dqopt->info[cnt])) | |
2228 | sb->dq_op->write_info(sb, cnt); | |
2229 | if (dqopt->ops[cnt]->free_file_info) | |
2230 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2231 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2232 | ||
2233 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2234 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2235 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2236 | dqopt->info[cnt].dqi_flags = 0; |
2237 | dqopt->info[cnt].dqi_igrace = 0; | |
2238 | dqopt->info[cnt].dqi_bgrace = 0; | |
2239 | dqopt->ops[cnt] = NULL; | |
2240 | } | |
ca785ec6 JK |
2241 | |
2242 | /* Skip syncing and setting flags if quota files are hidden */ | |
2243 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2244 | goto put_inodes; | |
2245 | ||
1da177e4 | 2246 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2247 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2248 | if (sb->s_op->sync_fs) |
2249 | sb->s_op->sync_fs(sb, 1); | |
2250 | sync_blockdev(sb->s_bdev); | |
2251 | /* Now the quota files are just ordinary files and we can set the | |
2252 | * inode flags back. Moreover we discard the pagecache so that | |
2253 | * userspace sees the writes we did bypassing the pagecache. We | |
2254 | * must also discard the blockdev buffers so that we see the | |
2255 | * changes done by userspace on the next quotaon() */ | |
2256 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2700e606 JK |
2257 | /* This can happen when suspending quotas on remount-ro... */ |
2258 | if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { | |
c3b00446 | 2259 | inode_lock(toputinode[cnt]); |
aad6cde9 | 2260 | toputinode[cnt]->i_flags &= ~S_NOQUOTA; |
c3b00446 JK |
2261 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); |
2262 | inode_unlock(toputinode[cnt]); | |
2263 | mark_inode_dirty_sync(toputinode[cnt]); | |
ca785ec6 JK |
2264 | } |
2265 | if (sb->s_bdev) | |
2266 | invalidate_bdev(sb->s_bdev); | |
2267 | put_inodes: | |
2268 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2269 | if (toputinode[cnt]) { | |
0ff5af83 | 2270 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2271 | * can reenable quota on the subsequent remount RW. We |
2272 | * have to check 'flags' variable and not use sb_has_ | |
2273 | * function because another quotaon / quotaoff could | |
2274 | * change global state before we got here. We refuse | |
2275 | * to suspend quotas when there is pending delete on | |
2276 | * the quota file... */ | |
2277 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2278 | iput(toputinode[cnt]); |
2279 | else if (!toputinode[cnt]->i_nlink) | |
2280 | ret = -EBUSY; | |
1da177e4 | 2281 | } |
0ff5af83 | 2282 | return ret; |
1da177e4 | 2283 | } |
0f0dd62f | 2284 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2285 | |
287a8095 | 2286 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2287 | { |
0f0dd62f CH |
2288 | return dquot_disable(sb, type, |
2289 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2290 | } |
287a8095 | 2291 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2292 | |
1da177e4 LT |
2293 | /* |
2294 | * Turn quotas on on a device | |
2295 | */ | |
2296 | ||
f55abc0f JK |
2297 | /* |
2298 | * Helper function to turn quotas on when we already have the inode of | |
2299 | * quota file and no quota information is loaded. | |
2300 | */ | |
2301 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2302 | unsigned int flags) | |
1da177e4 LT |
2303 | { |
2304 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2305 | struct super_block *sb = inode->i_sb; | |
2306 | struct quota_info *dqopt = sb_dqopt(sb); | |
2307 | int error; | |
1da177e4 LT |
2308 | |
2309 | if (!fmt) | |
2310 | return -ESRCH; | |
2311 | if (!S_ISREG(inode->i_mode)) { | |
2312 | error = -EACCES; | |
2313 | goto out_fmt; | |
2314 | } | |
2315 | if (IS_RDONLY(inode)) { | |
2316 | error = -EROFS; | |
2317 | goto out_fmt; | |
2318 | } | |
847aac64 LX |
2319 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2320 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2321 | error = -EINVAL; |
2322 | goto out_fmt; | |
2323 | } | |
5c004828 EB |
2324 | /* Filesystems outside of init_user_ns not yet supported */ |
2325 | if (sb->s_user_ns != &init_user_ns) { | |
2326 | error = -EINVAL; | |
2327 | goto out_fmt; | |
2328 | } | |
f55abc0f JK |
2329 | /* Usage always has to be set... */ |
2330 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2331 | error = -EINVAL; | |
2332 | goto out_fmt; | |
2333 | } | |
c3b00446 JK |
2334 | if (sb_has_quota_loaded(sb, type)) { |
2335 | error = -EBUSY; | |
2336 | goto out_fmt; | |
2337 | } | |
1da177e4 | 2338 | |
ca785ec6 | 2339 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2340 | /* As we bypass the pagecache we must now flush all the |
2341 | * dirty data and invalidate caches so that kernel sees | |
2342 | * changes from userspace. It is not enough to just flush | |
2343 | * the quota file since if blocksize < pagesize, invalidation | |
2344 | * of the cache could fail because of other unrelated dirty | |
2345 | * data */ | |
2346 | sync_filesystem(sb); | |
ca785ec6 JK |
2347 | invalidate_bdev(sb->s_bdev); |
2348 | } | |
ca785ec6 JK |
2349 | |
2350 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2351 | /* We don't want quota and atime on quota files (deadlocks | |
2352 | * possible) Also nobody should write to the file - we use | |
2353 | * special IO operations which ignore the immutable bit. */ | |
5955102c | 2354 | inode_lock(inode); |
aad6cde9 | 2355 | inode->i_flags |= S_NOQUOTA; |
5955102c | 2356 | inode_unlock(inode); |
26245c94 JK |
2357 | /* |
2358 | * When S_NOQUOTA is set, remove dquot references as no more | |
2359 | * references can be added | |
2360 | */ | |
9f754758 | 2361 | __dquot_drop(inode); |
ca785ec6 | 2362 | } |
1da177e4 LT |
2363 | |
2364 | error = -EIO; | |
2365 | dqopt->files[type] = igrab(inode); | |
2366 | if (!dqopt->files[type]) | |
c3b00446 | 2367 | goto out_file_flags; |
1da177e4 LT |
2368 | error = -EINVAL; |
2369 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2370 | goto out_file_init; | |
2371 | ||
2372 | dqopt->ops[type] = fmt->qf_ops; | |
2373 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2374 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2375 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
268157ba | 2376 | error = dqopt->ops[type]->read_file_info(sb, type); |
42fdb858 | 2377 | if (error < 0) |
1da177e4 | 2378 | goto out_file_init; |
15512377 JK |
2379 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { |
2380 | spin_lock(&dq_data_lock); | |
46fe44ce | 2381 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; |
15512377 JK |
2382 | spin_unlock(&dq_data_lock); |
2383 | } | |
cc33412f | 2384 | spin_lock(&dq_state_lock); |
f55abc0f | 2385 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2386 | spin_unlock(&dq_state_lock); |
1da177e4 | 2387 | |
1a6152d3 CY |
2388 | error = add_dquot_ref(sb, type); |
2389 | if (error) | |
2390 | dquot_disable(sb, type, flags); | |
1da177e4 | 2391 | |
1a6152d3 | 2392 | return error; |
1da177e4 LT |
2393 | out_file_init: |
2394 | dqopt->files[type] = NULL; | |
2395 | iput(inode); | |
c3b00446 | 2396 | out_file_flags: |
aad6cde9 JK |
2397 | inode_lock(inode); |
2398 | inode->i_flags &= ~S_NOQUOTA; | |
2399 | inode_unlock(inode); | |
1da177e4 LT |
2400 | out_fmt: |
2401 | put_quota_format(fmt); | |
2402 | ||
27942ef5 | 2403 | return error; |
1da177e4 LT |
2404 | } |
2405 | ||
0ff5af83 | 2406 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2407 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2408 | { |
2409 | struct quota_info *dqopt = sb_dqopt(sb); | |
2410 | struct inode *inode; | |
0f0dd62f | 2411 | int ret = 0, cnt; |
f55abc0f | 2412 | unsigned int flags; |
0ff5af83 | 2413 | |
7d6cd73d JK |
2414 | /* s_umount should be held in exclusive mode */ |
2415 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2416 | up_read(&sb->s_umount); | |
2417 | ||
0f0dd62f CH |
2418 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2419 | if (type != -1 && cnt != type) | |
2420 | continue; | |
c3b00446 | 2421 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2422 | continue; |
c3b00446 | 2423 | |
0f0dd62f CH |
2424 | inode = dqopt->files[cnt]; |
2425 | dqopt->files[cnt] = NULL; | |
2426 | spin_lock(&dq_state_lock); | |
2427 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2428 | DQUOT_LIMITS_ENABLED, | |
2429 | cnt); | |
2430 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2431 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2432 | |
0f0dd62f CH |
2433 | flags = dquot_generic_flag(flags, cnt); |
2434 | ret = vfs_load_quota_inode(inode, cnt, | |
2435 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2436 | iput(inode); | |
2437 | } | |
0ff5af83 JK |
2438 | |
2439 | return ret; | |
2440 | } | |
0f0dd62f | 2441 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2442 | |
f00c9e44 | 2443 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2444 | const struct path *path) |
77e69dac AV |
2445 | { |
2446 | int error = security_quota_on(path->dentry); | |
2447 | if (error) | |
2448 | return error; | |
2449 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2450 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2451 | error = -EXDEV; |
2452 | else | |
dea655c2 | 2453 | error = vfs_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2454 | format_id, DQUOT_USAGE_ENABLED | |
2455 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2456 | return error; |
2457 | } | |
287a8095 | 2458 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2459 | |
f55abc0f JK |
2460 | /* |
2461 | * More powerful function for turning on quotas allowing setting | |
2462 | * of individual quota flags | |
2463 | */ | |
287a8095 CH |
2464 | int dquot_enable(struct inode *inode, int type, int format_id, |
2465 | unsigned int flags) | |
f55abc0f | 2466 | { |
f55abc0f | 2467 | struct super_block *sb = inode->i_sb; |
f55abc0f JK |
2468 | |
2469 | /* Just unsuspend quotas? */ | |
0f0dd62f | 2470 | BUG_ON(flags & DQUOT_SUSPENDED); |
7d6cd73d JK |
2471 | /* s_umount should be held in exclusive mode */ |
2472 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2473 | up_read(&sb->s_umount); | |
0f0dd62f | 2474 | |
f55abc0f JK |
2475 | if (!flags) |
2476 | return 0; | |
2477 | /* Just updating flags needed? */ | |
2478 | if (sb_has_quota_loaded(sb, type)) { | |
f55abc0f | 2479 | if (flags & DQUOT_USAGE_ENABLED && |
c3b00446 JK |
2480 | sb_has_quota_usage_enabled(sb, type)) |
2481 | return -EBUSY; | |
f55abc0f | 2482 | if (flags & DQUOT_LIMITS_ENABLED && |
c3b00446 JK |
2483 | sb_has_quota_limits_enabled(sb, type)) |
2484 | return -EBUSY; | |
cc33412f | 2485 | spin_lock(&dq_state_lock); |
f55abc0f | 2486 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2487 | spin_unlock(&dq_state_lock); |
c3b00446 | 2488 | return 0; |
f55abc0f JK |
2489 | } |
2490 | ||
f55abc0f JK |
2491 | return vfs_load_quota_inode(inode, type, format_id, flags); |
2492 | } | |
287a8095 | 2493 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2494 | |
1da177e4 LT |
2495 | /* |
2496 | * This function is used when filesystem needs to initialize quotas | |
2497 | * during mount time. | |
2498 | */ | |
287a8095 | 2499 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2500 | int format_id, int type) |
1da177e4 | 2501 | { |
84de856e | 2502 | struct dentry *dentry; |
1da177e4 LT |
2503 | int error; |
2504 | ||
e12a4e8a | 2505 | dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2506 | if (IS_ERR(dentry)) |
2507 | return PTR_ERR(dentry); | |
2508 | ||
dea655c2 | 2509 | if (d_really_is_negative(dentry)) { |
154f484b JK |
2510 | error = -ENOENT; |
2511 | goto out; | |
2512 | } | |
2513 | ||
1da177e4 | 2514 | error = security_quota_on(dentry); |
84de856e | 2515 | if (!error) |
dea655c2 | 2516 | error = vfs_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2517 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2518 | |
154f484b | 2519 | out: |
84de856e CH |
2520 | dput(dentry); |
2521 | return error; | |
1da177e4 | 2522 | } |
287a8095 | 2523 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2524 | |
3e2af67e JK |
2525 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2526 | { | |
2527 | int ret; | |
2528 | int type; | |
2529 | struct quota_info *dqopt = sb_dqopt(sb); | |
2530 | ||
2531 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2532 | return -ENOSYS; | |
2533 | /* Accounting cannot be turned on while fs is mounted */ | |
2534 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2535 | if (!flags) | |
2536 | return -EINVAL; | |
2537 | for (type = 0; type < MAXQUOTAS; type++) { | |
2538 | if (!(flags & qtype_enforce_flag(type))) | |
2539 | continue; | |
2540 | /* Can't enforce without accounting */ | |
2541 | if (!sb_has_quota_usage_enabled(sb, type)) | |
2542 | return -EINVAL; | |
2543 | ret = dquot_enable(dqopt->files[type], type, | |
2544 | dqopt->info[type].dqi_fmt_id, | |
2545 | DQUOT_LIMITS_ENABLED); | |
2546 | if (ret < 0) | |
2547 | goto out_err; | |
2548 | } | |
2549 | return 0; | |
2550 | out_err: | |
2551 | /* Backout enforcement enablement we already did */ | |
2552 | for (type--; type >= 0; type--) { | |
2553 | if (flags & qtype_enforce_flag(type)) | |
2554 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2555 | } | |
2556 | /* Error code translation for better compatibility with XFS */ | |
2557 | if (ret == -EBUSY) | |
2558 | ret = -EEXIST; | |
2559 | return ret; | |
2560 | } | |
2561 | ||
2562 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2563 | { | |
2564 | int ret; | |
2565 | int type; | |
2566 | struct quota_info *dqopt = sb_dqopt(sb); | |
2567 | ||
2568 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2569 | return -ENOSYS; | |
2570 | /* | |
2571 | * We don't support turning off accounting via quotactl. In principle | |
2572 | * quota infrastructure can do this but filesystems don't expect | |
2573 | * userspace to be able to do it. | |
2574 | */ | |
2575 | if (flags & | |
2576 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2577 | return -EOPNOTSUPP; | |
2578 | ||
2579 | /* Filter out limits not enabled */ | |
2580 | for (type = 0; type < MAXQUOTAS; type++) | |
2581 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2582 | flags &= ~qtype_enforce_flag(type); | |
2583 | /* Nothing left? */ | |
2584 | if (!flags) | |
2585 | return -EEXIST; | |
2586 | for (type = 0; type < MAXQUOTAS; type++) { | |
2587 | if (flags & qtype_enforce_flag(type)) { | |
2588 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2589 | if (ret < 0) | |
2590 | goto out_err; | |
2591 | } | |
2592 | } | |
2593 | return 0; | |
2594 | out_err: | |
2595 | /* Backout enforcement disabling we already did */ | |
2596 | for (type--; type >= 0; type--) { | |
2597 | if (flags & qtype_enforce_flag(type)) | |
2598 | dquot_enable(dqopt->files[type], type, | |
2599 | dqopt->info[type].dqi_fmt_id, | |
2600 | DQUOT_LIMITS_ENABLED); | |
2601 | } | |
2602 | return ret; | |
2603 | } | |
2604 | ||
1da177e4 | 2605 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2606 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2607 | { |
2608 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2609 | ||
b9b2dd36 | 2610 | memset(di, 0, sizeof(*di)); |
7b9ca4c6 | 2611 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2612 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2613 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2614 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2615 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2616 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2617 | di->d_ino_count = dm->dqb_curinodes; | |
2618 | di->d_spc_timer = dm->dqb_btime; | |
2619 | di->d_ino_timer = dm->dqb_itime; | |
7b9ca4c6 | 2620 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 LT |
2621 | } |
2622 | ||
74a8a103 | 2623 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2624 | struct qc_dqblk *di) |
1da177e4 LT |
2625 | { |
2626 | struct dquot *dquot; | |
2627 | ||
aca645a6 | 2628 | dquot = dqget(sb, qid); |
6184fc0b JK |
2629 | if (IS_ERR(dquot)) |
2630 | return PTR_ERR(dquot); | |
1da177e4 LT |
2631 | do_get_dqblk(dquot, di); |
2632 | dqput(dquot); | |
cc33412f | 2633 | |
1da177e4 LT |
2634 | return 0; |
2635 | } | |
287a8095 | 2636 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2637 | |
be6257b2 JK |
2638 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2639 | struct qc_dqblk *di) | |
2640 | { | |
2641 | struct dquot *dquot; | |
2642 | int err; | |
2643 | ||
2644 | if (!sb->dq_op->get_next_id) | |
2645 | return -ENOSYS; | |
2646 | err = sb->dq_op->get_next_id(sb, qid); | |
2647 | if (err < 0) | |
2648 | return err; | |
2649 | dquot = dqget(sb, *qid); | |
2650 | if (IS_ERR(dquot)) | |
2651 | return PTR_ERR(dquot); | |
2652 | do_get_dqblk(dquot, di); | |
2653 | dqput(dquot); | |
2654 | ||
2655 | return 0; | |
2656 | } | |
2657 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2658 | ||
14bf61ff JK |
2659 | #define VFS_QC_MASK \ |
2660 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2661 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2662 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2663 | |
1da177e4 | 2664 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2665 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2666 | { |
2667 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2668 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2669 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2670 | |
14bf61ff | 2671 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2672 | return -EINVAL; |
2673 | ||
14bf61ff | 2674 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2675 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2676 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2677 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2678 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2679 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2680 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2681 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2682 | return -ERANGE; |
1da177e4 | 2683 | |
7b9ca4c6 | 2684 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2685 | if (di->d_fieldmask & QC_SPACE) { |
2686 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2687 | check_blim = 1; |
08261673 | 2688 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2689 | } |
c472b432 | 2690 | |
14bf61ff JK |
2691 | if (di->d_fieldmask & QC_SPC_SOFT) |
2692 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2693 | if (di->d_fieldmask & QC_SPC_HARD) | |
2694 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2695 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2696 | check_blim = 1; |
08261673 | 2697 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2698 | } |
c472b432 | 2699 | |
14bf61ff JK |
2700 | if (di->d_fieldmask & QC_INO_COUNT) { |
2701 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2702 | check_ilim = 1; |
08261673 | 2703 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2704 | } |
c472b432 | 2705 | |
14bf61ff | 2706 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2707 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2708 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2709 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2710 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2711 | check_ilim = 1; |
08261673 | 2712 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2713 | } |
c472b432 | 2714 | |
14bf61ff JK |
2715 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2716 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2717 | check_blim = 1; |
08261673 | 2718 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2719 | } |
c472b432 | 2720 | |
14bf61ff JK |
2721 | if (di->d_fieldmask & QC_INO_TIMER) { |
2722 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2723 | check_ilim = 1; |
08261673 | 2724 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2725 | } |
1da177e4 LT |
2726 | |
2727 | if (check_blim) { | |
268157ba | 2728 | if (!dm->dqb_bsoftlimit || |
41e327b5 | 2729 | dm->dqb_curspace + dm->dqb_rsvspace < dm->dqb_bsoftlimit) { |
1da177e4 LT |
2730 | dm->dqb_btime = 0; |
2731 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2732 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2733 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2734 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2735 | } |
2736 | if (check_ilim) { | |
268157ba JK |
2737 | if (!dm->dqb_isoftlimit || |
2738 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2739 | dm->dqb_itime = 0; |
2740 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2741 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2742 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2743 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2744 | } |
268157ba JK |
2745 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2746 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2747 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2748 | else | |
2749 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
7b9ca4c6 | 2750 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 | 2751 | mark_dquot_dirty(dquot); |
338bf9af AP |
2752 | |
2753 | return 0; | |
1da177e4 LT |
2754 | } |
2755 | ||
74a8a103 | 2756 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2757 | struct qc_dqblk *di) |
1da177e4 LT |
2758 | { |
2759 | struct dquot *dquot; | |
338bf9af | 2760 | int rc; |
1da177e4 | 2761 | |
aca645a6 | 2762 | dquot = dqget(sb, qid); |
6184fc0b JK |
2763 | if (IS_ERR(dquot)) { |
2764 | rc = PTR_ERR(dquot); | |
f55abc0f | 2765 | goto out; |
1da177e4 | 2766 | } |
338bf9af | 2767 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2768 | dqput(dquot); |
f55abc0f | 2769 | out: |
338bf9af | 2770 | return rc; |
1da177e4 | 2771 | } |
287a8095 | 2772 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2773 | |
2774 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2775 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2776 | { |
2777 | struct mem_dqinfo *mi; | |
0a240339 JK |
2778 | struct qc_type_state *tstate; |
2779 | struct quota_info *dqopt = sb_dqopt(sb); | |
2780 | int type; | |
27942ef5 | 2781 | |
0a240339 JK |
2782 | memset(state, 0, sizeof(*state)); |
2783 | for (type = 0; type < MAXQUOTAS; type++) { | |
2784 | if (!sb_has_quota_active(sb, type)) | |
2785 | continue; | |
2786 | tstate = state->s_state + type; | |
2787 | mi = sb_dqopt(sb)->info + type; | |
2788 | tstate->flags = QCI_ACCT_ENABLED; | |
2789 | spin_lock(&dq_data_lock); | |
2790 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2791 | tstate->flags |= QCI_SYSFILE; | |
2792 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2793 | tstate->flags |= QCI_ROOT_SQUASH; | |
2794 | if (sb_has_quota_limits_enabled(sb, type)) | |
2795 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2796 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2797 | tstate->ino_timelimit = mi->dqi_igrace; | |
2798 | tstate->ino = dqopt->files[type]->i_ino; | |
2799 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2800 | tstate->nextents = 1; /* We don't know... */ | |
2801 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2802 | } |
1da177e4 LT |
2803 | return 0; |
2804 | } | |
0a240339 | 2805 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2806 | |
2807 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2808 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2809 | { |
2810 | struct mem_dqinfo *mi; | |
f55abc0f | 2811 | int err = 0; |
1da177e4 | 2812 | |
5eacb2ac JK |
2813 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2814 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2815 | return -EINVAL; | |
9d1ccbe7 JK |
2816 | if (!sb_has_quota_active(sb, type)) |
2817 | return -ESRCH; | |
1da177e4 | 2818 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2819 | if (ii->i_fieldmask & QC_FLAGS) { |
2820 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2821 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2822 | return -EINVAL; | |
ca6cb091 | 2823 | } |
1da177e4 | 2824 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2825 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2826 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2827 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2828 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2829 | if (ii->i_fieldmask & QC_FLAGS) { | |
2830 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2831 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2832 | else | |
2833 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2834 | } | |
1da177e4 LT |
2835 | spin_unlock(&dq_data_lock); |
2836 | mark_info_dirty(sb, type); | |
2837 | /* Force write to disk */ | |
2838 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2839 | return err; |
1da177e4 | 2840 | } |
287a8095 | 2841 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2842 | |
3e2af67e JK |
2843 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2844 | .quota_enable = dquot_quota_enable, | |
2845 | .quota_disable = dquot_quota_disable, | |
2846 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2847 | .get_state = dquot_get_state, |
3e2af67e JK |
2848 | .set_info = dquot_set_dqinfo, |
2849 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2850 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2851 | .set_dqblk = dquot_set_dqblk |
2852 | }; | |
2853 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2854 | ||
dde95888 DM |
2855 | static int do_proc_dqstats(struct ctl_table *table, int write, |
2856 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2857 | { | |
dde95888 | 2858 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2859 | |
2860 | /* Update global table */ | |
2861 | dqstats.stat[type] = | |
2862 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2863 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2864 | } | |
2865 | ||
e628753b | 2866 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2867 | { |
1da177e4 | 2868 | .procname = "lookups", |
dde95888 | 2869 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2870 | .maxlen = sizeof(int), |
2871 | .mode = 0444, | |
dde95888 | 2872 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2873 | }, |
2874 | { | |
1da177e4 | 2875 | .procname = "drops", |
dde95888 | 2876 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2877 | .maxlen = sizeof(int), |
2878 | .mode = 0444, | |
dde95888 | 2879 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2880 | }, |
2881 | { | |
1da177e4 | 2882 | .procname = "reads", |
dde95888 | 2883 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2884 | .maxlen = sizeof(int), |
2885 | .mode = 0444, | |
dde95888 | 2886 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2887 | }, |
2888 | { | |
1da177e4 | 2889 | .procname = "writes", |
dde95888 | 2890 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2891 | .maxlen = sizeof(int), |
2892 | .mode = 0444, | |
dde95888 | 2893 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2894 | }, |
2895 | { | |
1da177e4 | 2896 | .procname = "cache_hits", |
dde95888 | 2897 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2898 | .maxlen = sizeof(int), |
2899 | .mode = 0444, | |
dde95888 | 2900 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2901 | }, |
2902 | { | |
1da177e4 | 2903 | .procname = "allocated_dquots", |
dde95888 | 2904 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2905 | .maxlen = sizeof(int), |
2906 | .mode = 0444, | |
dde95888 | 2907 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2908 | }, |
2909 | { | |
1da177e4 | 2910 | .procname = "free_dquots", |
dde95888 | 2911 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2912 | .maxlen = sizeof(int), |
2913 | .mode = 0444, | |
dde95888 | 2914 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2915 | }, |
2916 | { | |
1da177e4 | 2917 | .procname = "syncs", |
dde95888 | 2918 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2919 | .maxlen = sizeof(int), |
2920 | .mode = 0444, | |
dde95888 | 2921 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2922 | }, |
8e893469 | 2923 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2924 | { |
1da177e4 LT |
2925 | .procname = "warnings", |
2926 | .data = &flag_print_warnings, | |
2927 | .maxlen = sizeof(int), | |
2928 | .mode = 0644, | |
6d456111 | 2929 | .proc_handler = proc_dointvec, |
1da177e4 | 2930 | }, |
8e893469 | 2931 | #endif |
ab09203e | 2932 | { }, |
1da177e4 LT |
2933 | }; |
2934 | ||
e628753b | 2935 | static struct ctl_table fs_table[] = { |
1da177e4 | 2936 | { |
1da177e4 LT |
2937 | .procname = "quota", |
2938 | .mode = 0555, | |
2939 | .child = fs_dqstats_table, | |
2940 | }, | |
ab09203e | 2941 | { }, |
1da177e4 LT |
2942 | }; |
2943 | ||
e628753b | 2944 | static struct ctl_table sys_table[] = { |
1da177e4 | 2945 | { |
1da177e4 LT |
2946 | .procname = "fs", |
2947 | .mode = 0555, | |
2948 | .child = fs_table, | |
2949 | }, | |
ab09203e | 2950 | { }, |
1da177e4 LT |
2951 | }; |
2952 | ||
2953 | static int __init dquot_init(void) | |
2954 | { | |
f32764bd | 2955 | int i, ret; |
1da177e4 LT |
2956 | unsigned long nr_hash, order; |
2957 | ||
2958 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2959 | ||
0b4d4147 | 2960 | register_sysctl_table(sys_table); |
1da177e4 | 2961 | |
20c2df83 | 2962 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2963 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2964 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2965 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2966 | NULL); |
1da177e4 LT |
2967 | |
2968 | order = 0; | |
1aa3b3e0 | 2969 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); |
1da177e4 LT |
2970 | if (!dquot_hash) |
2971 | panic("Cannot create dquot hash table"); | |
2972 | ||
f32764bd | 2973 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2974 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2975 | if (ret) |
2976 | panic("Cannot create dquot stat counters"); | |
2977 | } | |
dde95888 | 2978 | |
1da177e4 LT |
2979 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2980 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2981 | dq_hash_bits = 0; | |
2982 | do { | |
2983 | dq_hash_bits++; | |
2984 | } while (nr_hash >> dq_hash_bits); | |
2985 | dq_hash_bits--; | |
2986 | ||
2987 | nr_hash = 1UL << dq_hash_bits; | |
2988 | dq_hash_mask = nr_hash - 1; | |
2989 | for (i = 0; i < nr_hash; i++) | |
2990 | INIT_HLIST_HEAD(dquot_hash + i); | |
2991 | ||
19858e7b AB |
2992 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2993 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2994 | |
88bc0ede TH |
2995 | if (register_shrinker(&dqcache_shrinker)) |
2996 | panic("Cannot register dquot shrinker"); | |
1da177e4 LT |
2997 | |
2998 | return 0; | |
2999 | } | |
331221fa | 3000 | fs_initcall(dquot_init); |