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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. | |
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 | * | |
54 | * (C) Copyright 1994 - 1997 Marco van Wieringen | |
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); | |
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); |
1da177e4 | 427 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) |
4c376dca | 428 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
1da177e4 LT |
429 | if (ret < 0) |
430 | goto out_iolock; | |
044c9b67 JK |
431 | /* Make sure flags update is visible after dquot has been filled */ |
432 | smp_mb__before_atomic(); | |
1da177e4 LT |
433 | set_bit(DQ_READ_B, &dquot->dq_flags); |
434 | /* Instantiate dquot if needed */ | |
435 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 436 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 437 | /* Write the info if needed */ |
4c376dca EB |
438 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
439 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
440 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 441 | } |
1da177e4 LT |
442 | if (ret < 0) |
443 | goto out_iolock; | |
444 | if (ret2 < 0) { | |
445 | ret = ret2; | |
446 | goto out_iolock; | |
447 | } | |
448 | } | |
044c9b67 JK |
449 | /* |
450 | * Make sure flags update is visible after on-disk struct has been | |
451 | * allocated. Paired with smp_rmb() in dqget(). | |
452 | */ | |
453 | smp_mb__before_atomic(); | |
1da177e4 LT |
454 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
455 | out_iolock: | |
d3be915f | 456 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
457 | return ret; |
458 | } | |
08d0350c | 459 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
460 | |
461 | /* | |
462 | * Write dquot to disk | |
463 | */ | |
464 | int dquot_commit(struct dquot *dquot) | |
465 | { | |
b03f2456 | 466 | int ret = 0; |
1da177e4 LT |
467 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
468 | ||
5e8cb9b6 | 469 | mutex_lock(&dquot->dq_lock); |
1e0b7cb0 | 470 | if (!clear_dquot_dirty(dquot)) |
5e8cb9b6 | 471 | goto out_lock; |
1da177e4 LT |
472 | /* Inactive dquot can be only if there was error during read/init |
473 | * => we have better not writing it */ | |
b03f2456 | 474 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 475 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
476 | else |
477 | ret = -EIO; | |
5e8cb9b6 JK |
478 | out_lock: |
479 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
480 | return ret; |
481 | } | |
08d0350c | 482 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
483 | |
484 | /* | |
485 | * Release dquot | |
486 | */ | |
487 | int dquot_release(struct dquot *dquot) | |
488 | { | |
489 | int ret = 0, ret2 = 0; | |
490 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
491 | ||
d3be915f | 492 | mutex_lock(&dquot->dq_lock); |
1da177e4 | 493 | /* Check whether we are not racing with some other dqget() */ |
0dad3b52 | 494 | if (dquot_is_busy(dquot)) |
1da177e4 | 495 | goto out_dqlock; |
4c376dca EB |
496 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
497 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 498 | /* Write the info */ |
4c376dca EB |
499 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
500 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
501 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 502 | } |
1da177e4 LT |
503 | if (ret >= 0) |
504 | ret = ret2; | |
505 | } | |
506 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
1da177e4 | 507 | out_dqlock: |
d3be915f | 508 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
509 | return ret; |
510 | } | |
08d0350c | 511 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 512 | |
7d9056ba | 513 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
514 | { |
515 | kmem_cache_free(dquot_cachep, dquot); | |
516 | } | |
7d9056ba | 517 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
518 | |
519 | static inline void do_destroy_dquot(struct dquot *dquot) | |
520 | { | |
521 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* Invalidate all dquots on the list. Note that this function is called after |
525 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
526 | * quota users. There can still be some users of quotas due to inodes being |
527 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 528 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 529 | */ |
1da177e4 LT |
530 | static void invalidate_dquots(struct super_block *sb, int type) |
531 | { | |
c33ed271 | 532 | struct dquot *dquot, *tmp; |
1da177e4 | 533 | |
6362e4d4 | 534 | restart: |
1da177e4 | 535 | spin_lock(&dq_list_lock); |
c33ed271 | 536 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
537 | if (dquot->dq_sb != sb) |
538 | continue; | |
4c376dca | 539 | if (dquot->dq_id.type != type) |
1da177e4 | 540 | continue; |
6362e4d4 JK |
541 | /* Wait for dquot users */ |
542 | if (atomic_read(&dquot->dq_count)) { | |
9f985cb6 | 543 | dqgrab(dquot); |
6362e4d4 | 544 | spin_unlock(&dq_list_lock); |
503330f3 JK |
545 | /* |
546 | * Once dqput() wakes us up, we know it's time to free | |
6362e4d4 JK |
547 | * the dquot. |
548 | * IMPORTANT: we rely on the fact that there is always | |
549 | * at most one process waiting for dquot to free. | |
550 | * Otherwise dq_count would be > 1 and we would never | |
551 | * wake up. | |
552 | */ | |
503330f3 JK |
553 | wait_event(dquot_ref_wq, |
554 | atomic_read(&dquot->dq_count) == 1); | |
6362e4d4 JK |
555 | dqput(dquot); |
556 | /* At this moment dquot() need not exist (it could be | |
557 | * reclaimed by prune_dqcache(). Hence we must | |
558 | * restart. */ | |
559 | goto restart; | |
560 | } | |
561 | /* | |
562 | * Quota now has no users and it has been written on last | |
563 | * dqput() | |
564 | */ | |
1da177e4 LT |
565 | remove_dquot_hash(dquot); |
566 | remove_free_dquot(dquot); | |
567 | remove_inuse(dquot); | |
74f783af | 568 | do_destroy_dquot(dquot); |
1da177e4 LT |
569 | } |
570 | spin_unlock(&dq_list_lock); | |
571 | } | |
572 | ||
12c77527 JK |
573 | /* Call callback for every active dquot on given filesystem */ |
574 | int dquot_scan_active(struct super_block *sb, | |
575 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
576 | unsigned long priv) | |
577 | { | |
578 | struct dquot *dquot, *old_dquot = NULL; | |
579 | int ret = 0; | |
580 | ||
ee1ac541 JK |
581 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
582 | ||
12c77527 JK |
583 | spin_lock(&dq_list_lock); |
584 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
585 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
586 | continue; | |
587 | if (dquot->dq_sb != sb) | |
588 | continue; | |
589 | /* Now we have active dquot so we can just increase use count */ | |
590 | atomic_inc(&dquot->dq_count); | |
12c77527 | 591 | spin_unlock(&dq_list_lock); |
dde95888 | 592 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
593 | dqput(old_dquot); |
594 | old_dquot = dquot; | |
1362f4ea JK |
595 | /* |
596 | * ->release_dquot() can be racing with us. Our reference | |
597 | * protects us from new calls to it so just wait for any | |
598 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
599 | */ | |
600 | wait_on_dquot(dquot); | |
601 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
602 | ret = fn(dquot, priv); | |
603 | if (ret < 0) | |
604 | goto out; | |
605 | } | |
12c77527 JK |
606 | spin_lock(&dq_list_lock); |
607 | /* We are safe to continue now because our dquot could not | |
608 | * be moved out of the inuse list while we hold the reference */ | |
609 | } | |
610 | spin_unlock(&dq_list_lock); | |
611 | out: | |
612 | dqput(old_dquot); | |
12c77527 JK |
613 | return ret; |
614 | } | |
08d0350c | 615 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 616 | |
ceed1723 JK |
617 | /* Write all dquot structures to quota files */ |
618 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 | 619 | { |
87b7935d | 620 | struct list_head dirty; |
1da177e4 LT |
621 | struct dquot *dquot; |
622 | struct quota_info *dqopt = sb_dqopt(sb); | |
623 | int cnt; | |
ceed1723 | 624 | int err, ret = 0; |
1da177e4 | 625 | |
9d1ccbe7 JK |
626 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
627 | ||
1da177e4 LT |
628 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
629 | if (type != -1 && cnt != type) | |
630 | continue; | |
f55abc0f | 631 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
632 | continue; |
633 | spin_lock(&dq_list_lock); | |
87b7935d DM |
634 | /* Move list away to avoid livelock. */ |
635 | list_replace_init(&dqopt->info[cnt].dqi_dirty_list, &dirty); | |
636 | while (!list_empty(&dirty)) { | |
637 | dquot = list_first_entry(&dirty, struct dquot, | |
268157ba | 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 LT |
714 | { |
715 | struct list_head *head; | |
716 | struct dquot *dquot; | |
1ab6c499 | 717 | unsigned long freed = 0; |
1da177e4 | 718 | |
d68aab6b | 719 | spin_lock(&dq_list_lock); |
1da177e4 | 720 | head = free_dquots.prev; |
1ab6c499 | 721 | while (head != &free_dquots && sc->nr_to_scan) { |
1da177e4 LT |
722 | dquot = list_entry(head, struct dquot, dq_free); |
723 | remove_dquot_hash(dquot); | |
724 | remove_free_dquot(dquot); | |
725 | remove_inuse(dquot); | |
74f783af | 726 | do_destroy_dquot(dquot); |
1ab6c499 DC |
727 | sc->nr_to_scan--; |
728 | freed++; | |
1da177e4 LT |
729 | head = free_dquots.prev; |
730 | } | |
d68aab6b | 731 | spin_unlock(&dq_list_lock); |
1ab6c499 | 732 | return freed; |
1da177e4 LT |
733 | } |
734 | ||
1ab6c499 DC |
735 | static unsigned long |
736 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 737 | { |
55f841ce GC |
738 | return vfs_pressure_ratio( |
739 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
740 | } |
741 | ||
8e1f936b | 742 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
743 | .count_objects = dqcache_shrink_count, |
744 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
745 | .seeks = DEFAULT_SEEKS, |
746 | }; | |
747 | ||
1da177e4 LT |
748 | /* |
749 | * Put reference to dquot | |
1da177e4 | 750 | */ |
3d9ea253 | 751 | void dqput(struct dquot *dquot) |
1da177e4 | 752 | { |
b48d3805 JK |
753 | int ret; |
754 | ||
1da177e4 LT |
755 | if (!dquot) |
756 | return; | |
62af9b52 | 757 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 758 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 759 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
760 | quotatypes[dquot->dq_id.type], |
761 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
762 | BUG(); |
763 | } | |
764 | #endif | |
dde95888 | 765 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
766 | we_slept: |
767 | spin_lock(&dq_list_lock); | |
768 | if (atomic_read(&dquot->dq_count) > 1) { | |
769 | /* We have more than one user... nothing to do */ | |
770 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 771 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 772 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 | 773 | atomic_read(&dquot->dq_count) == 1) |
503330f3 | 774 | wake_up(&dquot_ref_wq); |
1da177e4 LT |
775 | spin_unlock(&dq_list_lock); |
776 | return; | |
777 | } | |
778 | /* Need to release dquot? */ | |
4580b30e | 779 | if (dquot_dirty(dquot)) { |
1da177e4 LT |
780 | spin_unlock(&dq_list_lock); |
781 | /* Commit dquot before releasing */ | |
b48d3805 JK |
782 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
783 | if (ret < 0) { | |
fb5ffb0e JZ |
784 | quota_error(dquot->dq_sb, "Can't write quota structure" |
785 | " (error %d). Quota may get out of sync!", | |
786 | ret); | |
b48d3805 JK |
787 | /* |
788 | * We clear dirty bit anyway, so that we avoid | |
789 | * infinite loop here | |
790 | */ | |
b48d3805 | 791 | clear_dquot_dirty(dquot); |
b48d3805 | 792 | } |
1da177e4 LT |
793 | goto we_slept; |
794 | } | |
1da177e4 LT |
795 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
796 | spin_unlock(&dq_list_lock); | |
797 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
798 | goto we_slept; | |
799 | } | |
800 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 801 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 802 | /* sanity check */ |
8abf6a47 | 803 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
804 | #endif |
805 | put_dquot_last(dquot); | |
806 | spin_unlock(&dq_list_lock); | |
807 | } | |
08d0350c | 808 | EXPORT_SYMBOL(dqput); |
1da177e4 | 809 | |
7d9056ba | 810 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
811 | { |
812 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
813 | } | |
7d9056ba | 814 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 815 | |
1da177e4 LT |
816 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
817 | { | |
818 | struct dquot *dquot; | |
819 | ||
74f783af | 820 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 821 | if(!dquot) |
dd6f3c6d | 822 | return NULL; |
1da177e4 | 823 | |
d3be915f | 824 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
825 | INIT_LIST_HEAD(&dquot->dq_free); |
826 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
827 | INIT_HLIST_NODE(&dquot->dq_hash); | |
828 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
829 | dquot->dq_sb = sb; | |
1a06d420 | 830 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 | 831 | atomic_set(&dquot->dq_count, 1); |
7b9ca4c6 | 832 | spin_lock_init(&dquot->dq_dqb_lock); |
1da177e4 LT |
833 | |
834 | return dquot; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Get reference to dquot | |
cc33412f JK |
839 | * |
840 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
841 | * destroying our dquot by: | |
842 | * a) checking for quota flags under dq_list_lock and | |
843 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 844 | */ |
aca645a6 | 845 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 846 | { |
1a06d420 | 847 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 848 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 849 | |
d49d3762 EB |
850 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
851 | return ERR_PTR(-EINVAL); | |
852 | ||
1a06d420 | 853 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 854 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
855 | we_slept: |
856 | spin_lock(&dq_list_lock); | |
cc33412f | 857 | spin_lock(&dq_state_lock); |
1a06d420 | 858 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
859 | spin_unlock(&dq_state_lock); |
860 | spin_unlock(&dq_list_lock); | |
6184fc0b | 861 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
862 | goto out; |
863 | } | |
864 | spin_unlock(&dq_state_lock); | |
865 | ||
1a06d420 | 866 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
867 | if (!dquot) { |
868 | if (!empty) { | |
1da177e4 | 869 | spin_unlock(&dq_list_lock); |
1a06d420 | 870 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 871 | if (!empty) |
1da177e4 LT |
872 | schedule(); /* Try to wait for a moment... */ |
873 | goto we_slept; | |
874 | } | |
875 | dquot = empty; | |
dd6f3c6d | 876 | empty = NULL; |
4c376dca | 877 | dquot->dq_id = qid; |
1da177e4 LT |
878 | /* all dquots go on the inuse_list */ |
879 | put_inuse(dquot); | |
880 | /* hash it first so it can be found */ | |
881 | insert_dquot_hash(dquot); | |
1da177e4 | 882 | spin_unlock(&dq_list_lock); |
dde95888 | 883 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
884 | } else { |
885 | if (!atomic_read(&dquot->dq_count)) | |
886 | remove_free_dquot(dquot); | |
887 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 888 | spin_unlock(&dq_list_lock); |
dde95888 DM |
889 | dqstats_inc(DQST_CACHE_HITS); |
890 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 891 | } |
268157ba JK |
892 | /* Wait for dq_lock - after this we know that either dquot_release() is |
893 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 894 | wait_on_dquot(dquot); |
268157ba | 895 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
896 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
897 | int err; | |
898 | ||
899 | err = sb->dq_op->acquire_dquot(dquot); | |
900 | if (err < 0) { | |
901 | dqput(dquot); | |
902 | dquot = ERR_PTR(err); | |
903 | goto out; | |
904 | } | |
1da177e4 | 905 | } |
044c9b67 JK |
906 | /* |
907 | * Make sure following reads see filled structure - paired with | |
908 | * smp_mb__before_atomic() in dquot_acquire(). | |
909 | */ | |
910 | smp_rmb(); | |
62af9b52 | 911 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 912 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 913 | #endif |
cc33412f JK |
914 | out: |
915 | if (empty) | |
916 | do_destroy_dquot(empty); | |
1da177e4 LT |
917 | |
918 | return dquot; | |
919 | } | |
08d0350c | 920 | EXPORT_SYMBOL(dqget); |
1da177e4 | 921 | |
2d0fa467 JK |
922 | static inline struct dquot **i_dquot(struct inode *inode) |
923 | { | |
2d0fa467 JK |
924 | return inode->i_sb->s_op->get_dquots(inode); |
925 | } | |
926 | ||
1da177e4 LT |
927 | static int dqinit_needed(struct inode *inode, int type) |
928 | { | |
5bcd3b6f | 929 | struct dquot * const *dquots; |
1da177e4 LT |
930 | int cnt; |
931 | ||
932 | if (IS_NOQUOTA(inode)) | |
933 | return 0; | |
5bcd3b6f KK |
934 | |
935 | dquots = i_dquot(inode); | |
1da177e4 | 936 | if (type != -1) |
5bcd3b6f | 937 | return !dquots[type]; |
1da177e4 | 938 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 939 | if (!dquots[cnt]) |
1da177e4 LT |
940 | return 1; |
941 | return 0; | |
942 | } | |
943 | ||
c3b00446 | 944 | /* This routine is guarded by s_umount semaphore */ |
1a6152d3 | 945 | static int add_dquot_ref(struct super_block *sb, int type) |
1da177e4 | 946 | { |
941d2380 | 947 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 948 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 949 | int reserved = 0; |
4c5e6c0e | 950 | #endif |
1a6152d3 | 951 | int err = 0; |
1da177e4 | 952 | |
74278da9 | 953 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 954 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
955 | spin_lock(&inode->i_lock); |
956 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
957 | !atomic_read(&inode->i_writecount) || | |
958 | !dqinit_needed(inode, type)) { | |
959 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 960 | continue; |
250df6ed | 961 | } |
d003fb70 | 962 | __iget(inode); |
250df6ed | 963 | spin_unlock(&inode->i_lock); |
74278da9 | 964 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 965 | |
d7e97117 JK |
966 | #ifdef CONFIG_QUOTA_DEBUG |
967 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
968 | reserved = 1; | |
969 | #endif | |
941d2380 | 970 | iput(old_inode); |
1a6152d3 CY |
971 | err = __dquot_initialize(inode, type); |
972 | if (err) { | |
973 | iput(inode); | |
974 | goto out; | |
975 | } | |
55fa6091 DC |
976 | |
977 | /* | |
978 | * We hold a reference to 'inode' so it couldn't have been | |
979 | * removed from s_inodes list while we dropped the | |
74278da9 | 980 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 981 | * holding the last reference and we cannot iput it under |
74278da9 | 982 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
983 | * later. |
984 | */ | |
941d2380 | 985 | old_inode = inode; |
74278da9 | 986 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 987 | } |
74278da9 | 988 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 989 | iput(old_inode); |
1a6152d3 | 990 | out: |
62af9b52 | 991 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 992 | if (reserved) { |
fb5ffb0e JZ |
993 | quota_error(sb, "Writes happened before quota was turned on " |
994 | "thus quota information is probably inconsistent. " | |
995 | "Please run quotacheck(8)"); | |
0a5a9c72 | 996 | } |
4c5e6c0e | 997 | #endif |
1a6152d3 | 998 | return err; |
1da177e4 LT |
999 | } |
1000 | ||
268157ba JK |
1001 | /* |
1002 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 1003 | * if we have the last reference to dquot |
268157ba | 1004 | */ |
9eb6463f NY |
1005 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
1006 | struct list_head *tofree_head) | |
1da177e4 | 1007 | { |
5bcd3b6f KK |
1008 | struct dquot **dquots = i_dquot(inode); |
1009 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 1010 | |
9eb6463f NY |
1011 | if (!dquot) |
1012 | return; | |
1013 | ||
5bcd3b6f | 1014 | dquots[type] = NULL; |
9eb6463f NY |
1015 | if (list_empty(&dquot->dq_free)) { |
1016 | /* | |
1017 | * The inode still has reference to dquot so it can't be in the | |
1018 | * free list | |
1019 | */ | |
1020 | spin_lock(&dq_list_lock); | |
1021 | list_add(&dquot->dq_free, tofree_head); | |
1022 | spin_unlock(&dq_list_lock); | |
1023 | } else { | |
1024 | /* | |
1025 | * Dquot is already in a list to put so we won't drop the last | |
1026 | * reference here. | |
1027 | */ | |
1028 | dqput(dquot); | |
1da177e4 | 1029 | } |
1da177e4 LT |
1030 | } |
1031 | ||
268157ba JK |
1032 | /* |
1033 | * Free list of dquots | |
1034 | * Dquots are removed from inodes and no new references can be got so we are | |
1035 | * the only ones holding reference | |
1036 | */ | |
1da177e4 LT |
1037 | static void put_dquot_list(struct list_head *tofree_head) |
1038 | { | |
1039 | struct list_head *act_head; | |
1040 | struct dquot *dquot; | |
1041 | ||
1042 | act_head = tofree_head->next; | |
1da177e4 LT |
1043 | while (act_head != tofree_head) { |
1044 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1045 | act_head = act_head->next; | |
268157ba JK |
1046 | /* Remove dquot from the list so we won't have problems... */ |
1047 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1048 | dqput(dquot); |
1049 | } | |
1050 | } | |
1051 | ||
fb58b731 CH |
1052 | static void remove_dquot_ref(struct super_block *sb, int type, |
1053 | struct list_head *tofree_head) | |
1054 | { | |
1055 | struct inode *inode; | |
7af9cce8 | 1056 | int reserved = 0; |
fb58b731 | 1057 | |
74278da9 | 1058 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1059 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1060 | /* |
1061 | * We have to scan also I_NEW inodes because they can already | |
1062 | * have quota pointer initialized. Luckily, we need to touch | |
1063 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1064 | * (dq_data_lock). |
aabb8fdb | 1065 | */ |
b9ba6f94 | 1066 | spin_lock(&dq_data_lock); |
7af9cce8 DM |
1067 | if (!IS_NOQUOTA(inode)) { |
1068 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
1069 | reserved = 1; | |
fb58b731 | 1070 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1071 | } |
b9ba6f94 | 1072 | spin_unlock(&dq_data_lock); |
fb58b731 | 1073 | } |
74278da9 | 1074 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1075 | #ifdef CONFIG_QUOTA_DEBUG |
1076 | if (reserved) { | |
1077 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1078 | " was disabled thus quota information is probably " | |
1079 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1080 | } | |
1081 | #endif | |
fb58b731 CH |
1082 | } |
1083 | ||
1da177e4 LT |
1084 | /* Gather all references from inodes and drop them */ |
1085 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1086 | { | |
1087 | LIST_HEAD(tofree_head); | |
1088 | ||
fb58b731 | 1089 | if (sb->dq_op) { |
fb58b731 | 1090 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1091 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1092 | put_dquot_list(&tofree_head); |
1093 | } | |
1da177e4 LT |
1094 | } |
1095 | ||
740d9dcd MC |
1096 | static inline |
1097 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1098 | { | |
0a5a9c72 JK |
1099 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1100 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1101 | else { | |
1102 | WARN_ON_ONCE(1); | |
1103 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1104 | } | |
41e327b5 | 1105 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1106 | dquot->dq_dqb.dqb_bsoftlimit) | |
1107 | dquot->dq_dqb.dqb_btime = (time64_t) 0; | |
1108 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
740d9dcd MC |
1109 | } |
1110 | ||
7a2435d8 | 1111 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1112 | { |
db49d2df JK |
1113 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1114 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1115 | dquot->dq_dqb.dqb_curinodes -= number; |
1116 | else | |
1117 | dquot->dq_dqb.dqb_curinodes = 0; | |
1118 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1119 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1120 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1121 | } | |
1122 | ||
7a2435d8 | 1123 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1124 | { |
db49d2df JK |
1125 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1126 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1127 | dquot->dq_dqb.dqb_curspace -= number; |
1128 | else | |
1129 | dquot->dq_dqb.dqb_curspace = 0; | |
41e327b5 | 1130 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1131 | dquot->dq_dqb.dqb_bsoftlimit) | |
e008bb61 | 1132 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1133 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1134 | } | |
1135 | ||
bf097aaf JK |
1136 | struct dquot_warn { |
1137 | struct super_block *w_sb; | |
7b9c7321 | 1138 | struct kqid w_dq_id; |
bf097aaf JK |
1139 | short w_type; |
1140 | }; | |
1141 | ||
c525460e JK |
1142 | static int warning_issued(struct dquot *dquot, const int warntype) |
1143 | { | |
1144 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1145 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1146 | ((warntype == QUOTA_NL_IHARDWARN || | |
1147 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1148 | ||
1149 | if (!flag) | |
1150 | return 0; | |
1151 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1152 | } | |
1153 | ||
8e893469 | 1154 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1155 | static int flag_print_warnings = 1; |
1156 | ||
bf097aaf | 1157 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1158 | { |
1159 | if (!flag_print_warnings) | |
1160 | return 0; | |
1161 | ||
7b9c7321 | 1162 | switch (warn->w_dq_id.type) { |
1da177e4 | 1163 | case USRQUOTA: |
1a06d420 | 1164 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1165 | case GRPQUOTA: |
7b9c7321 | 1166 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1167 | case PRJQUOTA: |
1168 | return 1; | |
1da177e4 LT |
1169 | } |
1170 | return 0; | |
1171 | } | |
1172 | ||
1da177e4 | 1173 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1174 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1175 | { |
1176 | char *msg = NULL; | |
24ec839c | 1177 | struct tty_struct *tty; |
bf097aaf | 1178 | int warntype = warn->w_type; |
1da177e4 | 1179 | |
657d3bfa JK |
1180 | if (warntype == QUOTA_NL_IHARDBELOW || |
1181 | warntype == QUOTA_NL_ISOFTBELOW || | |
1182 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1183 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1184 | return; |
1185 | ||
24ec839c PZ |
1186 | tty = get_current_tty(); |
1187 | if (!tty) | |
452a00d2 | 1188 | return; |
bf097aaf | 1189 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1190 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1191 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1192 | else |
24ec839c | 1193 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1194 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1195 | switch (warntype) { |
8e893469 | 1196 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1197 | msg = " file limit reached.\r\n"; |
1198 | break; | |
8e893469 | 1199 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1200 | msg = " file quota exceeded too long.\r\n"; |
1201 | break; | |
8e893469 | 1202 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1203 | msg = " file quota exceeded.\r\n"; |
1204 | break; | |
8e893469 | 1205 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1206 | msg = " block limit reached.\r\n"; |
1207 | break; | |
8e893469 | 1208 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1209 | msg = " block quota exceeded too long.\r\n"; |
1210 | break; | |
8e893469 | 1211 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1212 | msg = " block quota exceeded.\r\n"; |
1213 | break; | |
1214 | } | |
24ec839c | 1215 | tty_write_message(tty, msg); |
452a00d2 | 1216 | tty_kref_put(tty); |
1da177e4 | 1217 | } |
8e893469 JK |
1218 | #endif |
1219 | ||
bf097aaf JK |
1220 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1221 | int warntype) | |
1222 | { | |
1223 | if (warning_issued(dquot, warntype)) | |
1224 | return; | |
1225 | warn->w_type = warntype; | |
1226 | warn->w_sb = dquot->dq_sb; | |
1227 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1228 | } |
1229 | ||
f18df228 MC |
1230 | /* |
1231 | * Write warnings to the console and send warning messages over netlink. | |
1232 | * | |
bf097aaf | 1233 | * Note that this function can call into tty and networking code. |
f18df228 | 1234 | */ |
bf097aaf | 1235 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1236 | { |
1237 | int i; | |
1238 | ||
86e931a3 | 1239 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1240 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1241 | continue; | |
8e893469 | 1242 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1243 | print_warning(&warn[i]); |
8e893469 | 1244 | #endif |
7b9c7321 | 1245 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1246 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1247 | } |
1da177e4 LT |
1248 | } |
1249 | ||
7a2435d8 | 1250 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1251 | { |
4c376dca | 1252 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1253 | |
1254 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1255 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1256 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1257 | } |
1258 | ||
7b9ca4c6 JK |
1259 | static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, |
1260 | struct dquot_warn *warn) | |
1da177e4 | 1261 | { |
7b9ca4c6 JK |
1262 | qsize_t newinodes; |
1263 | int ret = 0; | |
268157ba | 1264 | |
7b9ca4c6 JK |
1265 | spin_lock(&dquot->dq_dqb_lock); |
1266 | newinodes = dquot->dq_dqb.dqb_curinodes + inodes; | |
4c376dca | 1267 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1268 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
7b9ca4c6 | 1269 | goto add; |
1da177e4 LT |
1270 | |
1271 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1272 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1273 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1274 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
7b9ca4c6 JK |
1275 | ret = -EDQUOT; |
1276 | goto out; | |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1280 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1281 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1282 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1283 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1284 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
7b9ca4c6 JK |
1285 | ret = -EDQUOT; |
1286 | goto out; | |
1da177e4 LT |
1287 | } |
1288 | ||
1289 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1290 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1291 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1292 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1293 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1294 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 | 1295 | } |
7b9ca4c6 JK |
1296 | add: |
1297 | dquot->dq_dqb.dqb_curinodes = newinodes; | |
1da177e4 | 1298 | |
7b9ca4c6 JK |
1299 | out: |
1300 | spin_unlock(&dquot->dq_dqb_lock); | |
1301 | return ret; | |
1da177e4 LT |
1302 | } |
1303 | ||
7b9ca4c6 JK |
1304 | static int dquot_add_space(struct dquot *dquot, qsize_t space, |
1305 | qsize_t rsv_space, unsigned int flags, | |
1306 | struct dquot_warn *warn) | |
1da177e4 | 1307 | { |
f18df228 | 1308 | qsize_t tspace; |
268157ba | 1309 | struct super_block *sb = dquot->dq_sb; |
7b9ca4c6 | 1310 | int ret = 0; |
f18df228 | 1311 | |
7b9ca4c6 | 1312 | spin_lock(&dquot->dq_dqb_lock); |
4c376dca | 1313 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1314 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
ac3d7939 | 1315 | goto finish; |
1da177e4 | 1316 | |
f18df228 | 1317 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
7b9ca4c6 JK |
1318 | + space + rsv_space; |
1319 | ||
1da177e4 | 1320 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1321 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 | 1322 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1323 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1324 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
7b9ca4c6 | 1325 | ret = -EDQUOT; |
ac3d7939 | 1326 | goto finish; |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1330 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1331 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1332 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 | 1333 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1334 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1335 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
7b9ca4c6 | 1336 | ret = -EDQUOT; |
ac3d7939 | 1337 | goto finish; |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1341 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 | 1342 | dquot->dq_dqb.dqb_btime == 0) { |
7b9ca4c6 | 1343 | if (flags & DQUOT_SPACE_WARN) { |
bf097aaf | 1344 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1345 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1346 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
7b9ca4c6 | 1347 | } else { |
1da177e4 LT |
1348 | /* |
1349 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1350 | * be always printed | |
1351 | */ | |
7b9ca4c6 | 1352 | ret = -EDQUOT; |
ac3d7939 | 1353 | goto finish; |
7b9ca4c6 | 1354 | } |
1da177e4 | 1355 | } |
ac3d7939 JK |
1356 | finish: |
1357 | /* | |
1358 | * We have to be careful and go through warning generation & grace time | |
1359 | * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it | |
1360 | * only here... | |
1361 | */ | |
1362 | if (flags & DQUOT_SPACE_NOFAIL) | |
1363 | ret = 0; | |
1364 | if (!ret) { | |
1365 | dquot->dq_dqb.dqb_rsvspace += rsv_space; | |
1366 | dquot->dq_dqb.dqb_curspace += space; | |
1367 | } | |
7b9ca4c6 JK |
1368 | spin_unlock(&dquot->dq_dqb_lock); |
1369 | return ret; | |
1da177e4 LT |
1370 | } |
1371 | ||
12095460 | 1372 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1373 | { |
268157ba JK |
1374 | qsize_t newinodes; |
1375 | ||
657d3bfa | 1376 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1377 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1378 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1379 | return QUOTA_NL_NOWARN; |
1380 | ||
268157ba JK |
1381 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1382 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1383 | return QUOTA_NL_ISOFTBELOW; |
1384 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1385 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1386 | return QUOTA_NL_IHARDBELOW; |
1387 | return QUOTA_NL_NOWARN; | |
1388 | } | |
1389 | ||
1390 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1391 | { | |
41e327b5 | 1392 | qsize_t tspace; |
1393 | ||
1394 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; | |
1395 | ||
657d3bfa | 1396 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
41e327b5 | 1397 | tspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1398 | return QUOTA_NL_NOWARN; |
1399 | ||
41e327b5 | 1400 | if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1401 | return QUOTA_NL_BSOFTBELOW; |
41e327b5 | 1402 | if (tspace >= dquot->dq_dqb.dqb_bhardlimit && |
1403 | tspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1404 | return QUOTA_NL_BHARDBELOW; |
1405 | return QUOTA_NL_NOWARN; | |
1406 | } | |
0a5a9c72 | 1407 | |
189eef59 CH |
1408 | static int dquot_active(const struct inode *inode) |
1409 | { | |
1410 | struct super_block *sb = inode->i_sb; | |
1411 | ||
1412 | if (IS_NOQUOTA(inode)) | |
1413 | return 0; | |
1414 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1415 | } | |
1416 | ||
1da177e4 | 1417 | /* |
871a2931 CH |
1418 | * Initialize quota pointers in inode |
1419 | * | |
871a2931 CH |
1420 | * It is better to call this function outside of any transaction as it |
1421 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1422 | */ |
6184fc0b | 1423 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1424 | { |
1ea06bec | 1425 | int cnt, init_needed = 0; |
ab73ef46 | 1426 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1427 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1428 | qsize_t rsv; |
6184fc0b | 1429 | int ret = 0; |
1da177e4 | 1430 | |
189eef59 | 1431 | if (!dquot_active(inode)) |
6184fc0b | 1432 | return 0; |
cc33412f | 1433 | |
5bcd3b6f KK |
1434 | dquots = i_dquot(inode); |
1435 | ||
cc33412f JK |
1436 | /* First get references to structures we might need. */ |
1437 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1438 | struct kqid qid; |
847aac64 LX |
1439 | kprojid_t projid; |
1440 | int rc; | |
6184fc0b | 1441 | struct dquot *dquot; |
847aac64 | 1442 | |
cc33412f JK |
1443 | if (type != -1 && cnt != type) |
1444 | continue; | |
1ea06bec NY |
1445 | /* |
1446 | * The i_dquot should have been initialized in most cases, | |
1447 | * we check it without locking here to avoid unnecessary | |
1448 | * dqget()/dqput() calls. | |
1449 | */ | |
5bcd3b6f | 1450 | if (dquots[cnt]) |
1ea06bec | 1451 | continue; |
847aac64 LX |
1452 | |
1453 | if (!sb_has_quota_active(sb, cnt)) | |
1454 | continue; | |
1455 | ||
1ea06bec NY |
1456 | init_needed = 1; |
1457 | ||
cc33412f JK |
1458 | switch (cnt) { |
1459 | case USRQUOTA: | |
aca645a6 | 1460 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1461 | break; |
1462 | case GRPQUOTA: | |
aca645a6 | 1463 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1464 | break; |
847aac64 LX |
1465 | case PRJQUOTA: |
1466 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1467 | if (rc) | |
1468 | continue; | |
1469 | qid = make_kqid_projid(projid); | |
1470 | break; | |
cc33412f | 1471 | } |
6184fc0b JK |
1472 | dquot = dqget(sb, qid); |
1473 | if (IS_ERR(dquot)) { | |
1474 | /* We raced with somebody turning quotas off... */ | |
1475 | if (PTR_ERR(dquot) != -ESRCH) { | |
1476 | ret = PTR_ERR(dquot); | |
1477 | goto out_put; | |
1478 | } | |
1479 | dquot = NULL; | |
1480 | } | |
1481 | got[cnt] = dquot; | |
cc33412f JK |
1482 | } |
1483 | ||
1ea06bec NY |
1484 | /* All required i_dquot has been initialized */ |
1485 | if (!init_needed) | |
6184fc0b | 1486 | return 0; |
1ea06bec | 1487 | |
b9ba6f94 | 1488 | spin_lock(&dq_data_lock); |
1da177e4 | 1489 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1490 | goto out_lock; |
1da177e4 LT |
1491 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1492 | if (type != -1 && cnt != type) | |
1493 | continue; | |
cc33412f JK |
1494 | /* Avoid races with quotaoff() */ |
1495 | if (!sb_has_quota_active(sb, cnt)) | |
1496 | continue; | |
4408ea41 JK |
1497 | /* We could race with quotaon or dqget() could have failed */ |
1498 | if (!got[cnt]) | |
1499 | continue; | |
5bcd3b6f KK |
1500 | if (!dquots[cnt]) { |
1501 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1502 | got[cnt] = NULL; |
0a5a9c72 JK |
1503 | /* |
1504 | * Make quota reservation system happy if someone | |
1505 | * did a write before quota was turned on | |
1506 | */ | |
1507 | rsv = inode_get_rsv_space(inode); | |
7b9ca4c6 JK |
1508 | if (unlikely(rsv)) { |
1509 | spin_lock(&inode->i_lock); | |
1510 | /* Get reservation again under proper lock */ | |
1511 | rsv = __inode_get_rsv_space(inode); | |
1512 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1513 | dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; | |
1514 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1515 | spin_unlock(&inode->i_lock); | |
1516 | } | |
1da177e4 LT |
1517 | } |
1518 | } | |
6184fc0b | 1519 | out_lock: |
b9ba6f94 | 1520 | spin_unlock(&dq_data_lock); |
6184fc0b | 1521 | out_put: |
cc33412f | 1522 | /* Drop unused references */ |
dc52dd3a | 1523 | dqput_all(got); |
6184fc0b JK |
1524 | |
1525 | return ret; | |
871a2931 CH |
1526 | } |
1527 | ||
6184fc0b | 1528 | int dquot_initialize(struct inode *inode) |
871a2931 | 1529 | { |
6184fc0b | 1530 | return __dquot_initialize(inode, -1); |
1da177e4 | 1531 | } |
08d0350c | 1532 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1533 | |
b8cb5a54 TE |
1534 | bool dquot_initialize_needed(struct inode *inode) |
1535 | { | |
1536 | struct dquot **dquots; | |
1537 | int i; | |
1538 | ||
1539 | if (!dquot_active(inode)) | |
1540 | return false; | |
1541 | ||
1542 | dquots = i_dquot(inode); | |
1543 | for (i = 0; i < MAXQUOTAS; i++) | |
1544 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1545 | return true; | |
1546 | return false; | |
1547 | } | |
1548 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1549 | ||
1da177e4 | 1550 | /* |
b9ba6f94 NY |
1551 | * Release all quotas referenced by inode. |
1552 | * | |
1553 | * This function only be called on inode free or converting | |
1554 | * a file to quota file, no other users for the i_dquot in | |
1555 | * both cases, so we needn't call synchronize_srcu() after | |
1556 | * clearing i_dquot. | |
1da177e4 | 1557 | */ |
9f754758 | 1558 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1559 | { |
1560 | int cnt; | |
5bcd3b6f | 1561 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1562 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1563 | |
b9ba6f94 | 1564 | spin_lock(&dq_data_lock); |
1da177e4 | 1565 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1566 | put[cnt] = dquots[cnt]; |
1567 | dquots[cnt] = NULL; | |
1da177e4 | 1568 | } |
b9ba6f94 | 1569 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1570 | dqput_all(put); |
1da177e4 LT |
1571 | } |
1572 | ||
9f754758 CH |
1573 | void dquot_drop(struct inode *inode) |
1574 | { | |
5bcd3b6f | 1575 | struct dquot * const *dquots; |
9f754758 CH |
1576 | int cnt; |
1577 | ||
1578 | if (IS_NOQUOTA(inode)) | |
1579 | return; | |
1580 | ||
1581 | /* | |
1582 | * Test before calling to rule out calls from proc and such | |
1583 | * where we are not allowed to block. Note that this is | |
1584 | * actually reliable test even without the lock - the caller | |
1585 | * must assure that nobody can come after the DQUOT_DROP and | |
1586 | * add quota pointers back anyway. | |
1587 | */ | |
5bcd3b6f | 1588 | dquots = i_dquot(inode); |
9f754758 | 1589 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1590 | if (dquots[cnt]) |
9f754758 CH |
1591 | break; |
1592 | } | |
1593 | ||
1594 | if (cnt < MAXQUOTAS) | |
1595 | __dquot_drop(inode); | |
1596 | } | |
1597 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1598 | |
fd8fbfc1 DM |
1599 | /* |
1600 | * inode_reserved_space is managed internally by quota, and protected by | |
1601 | * i_lock similar to i_blocks+i_bytes. | |
1602 | */ | |
1603 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1604 | { | |
1605 | /* Filesystem must explicitly define it's own method in order to use | |
1606 | * quota reservation interface */ | |
1607 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1608 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1609 | } | |
1610 | ||
7b9ca4c6 | 1611 | static qsize_t __inode_get_rsv_space(struct inode *inode) |
fd8fbfc1 | 1612 | { |
7b9ca4c6 JK |
1613 | if (!inode->i_sb->dq_op->get_reserved_space) |
1614 | return 0; | |
1615 | return *inode_reserved_space(inode); | |
fd8fbfc1 DM |
1616 | } |
1617 | ||
1618 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1619 | { | |
1620 | qsize_t ret; | |
05b5d898 JK |
1621 | |
1622 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1623 | return 0; | |
fd8fbfc1 | 1624 | spin_lock(&inode->i_lock); |
7b9ca4c6 | 1625 | ret = __inode_get_rsv_space(inode); |
fd8fbfc1 DM |
1626 | spin_unlock(&inode->i_lock); |
1627 | return ret; | |
1628 | } | |
1629 | ||
1da177e4 | 1630 | /* |
5dd4056d CH |
1631 | * This functions updates i_blocks+i_bytes fields and quota information |
1632 | * (together with appropriate checks). | |
1633 | * | |
1634 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1635 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1636 | * the current transaction so that dquot write and inode write go into the | |
1637 | * same transaction. | |
1da177e4 LT |
1638 | */ |
1639 | ||
1640 | /* | |
1641 | * This operation can block, but only after everything is updated | |
1642 | */ | |
56246f9a | 1643 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1644 | { |
b9ba6f94 | 1645 | int cnt, ret = 0, index; |
bf097aaf | 1646 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1647 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1648 | struct dquot **dquots; |
1da177e4 | 1649 | |
189eef59 | 1650 | if (!dquot_active(inode)) { |
a478e522 JK |
1651 | if (reserve) { |
1652 | spin_lock(&inode->i_lock); | |
1653 | *inode_reserved_space(inode) += number; | |
1654 | spin_unlock(&inode->i_lock); | |
1655 | } else { | |
1656 | inode_add_bytes(inode, number); | |
1657 | } | |
fd8fbfc1 DM |
1658 | goto out; |
1659 | } | |
1660 | ||
1da177e4 | 1661 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1662 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1663 | |
5bcd3b6f | 1664 | dquots = i_dquot(inode); |
b9ba6f94 | 1665 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1666 | spin_lock(&inode->i_lock); |
1da177e4 | 1667 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1668 | if (!dquots[cnt]) |
1da177e4 | 1669 | continue; |
7b9ca4c6 JK |
1670 | if (flags & DQUOT_SPACE_RESERVE) { |
1671 | ret = dquot_add_space(dquots[cnt], 0, number, flags, | |
1672 | &warn[cnt]); | |
1673 | } else { | |
1674 | ret = dquot_add_space(dquots[cnt], number, 0, flags, | |
1675 | &warn[cnt]); | |
1676 | } | |
1677 | if (ret) { | |
1678 | /* Back out changes we already did */ | |
1679 | for (cnt--; cnt >= 0; cnt--) { | |
1680 | if (!dquots[cnt]) | |
1681 | continue; | |
1682 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1683 | if (flags & DQUOT_SPACE_RESERVE) { | |
1684 | dquots[cnt]->dq_dqb.dqb_rsvspace -= | |
1685 | number; | |
1686 | } else { | |
1687 | dquots[cnt]->dq_dqb.dqb_curspace -= | |
1688 | number; | |
1689 | } | |
1690 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1691 | } | |
1692 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 | 1693 | goto out_flush_warn; |
f18df228 | 1694 | } |
1da177e4 | 1695 | } |
7b9ca4c6 | 1696 | if (reserve) |
a478e522 | 1697 | *inode_reserved_space(inode) += number; |
7b9ca4c6 JK |
1698 | else |
1699 | __inode_add_bytes(inode, number); | |
1700 | spin_unlock(&inode->i_lock); | |
f18df228 | 1701 | |
fd8fbfc1 DM |
1702 | if (reserve) |
1703 | goto out_flush_warn; | |
bf097aaf | 1704 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1705 | out_flush_warn: |
b9ba6f94 | 1706 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1707 | flush_warnings(warn); |
f18df228 MC |
1708 | out: |
1709 | return ret; | |
1710 | } | |
5dd4056d | 1711 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1712 | |
1713 | /* | |
1714 | * This operation can block, but only after everything is updated | |
1715 | */ | |
6bab3596 | 1716 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1717 | { |
b9ba6f94 | 1718 | int cnt, ret = 0, index; |
bf097aaf | 1719 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1720 | struct dquot * const *dquots; |
1da177e4 | 1721 | |
189eef59 | 1722 | if (!dquot_active(inode)) |
63936dda | 1723 | return 0; |
1da177e4 | 1724 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1725 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1726 | |
5bcd3b6f | 1727 | dquots = i_dquot(inode); |
b9ba6f94 | 1728 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1729 | spin_lock(&inode->i_lock); |
1da177e4 | 1730 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1731 | if (!dquots[cnt]) |
1da177e4 | 1732 | continue; |
7b9ca4c6 JK |
1733 | ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); |
1734 | if (ret) { | |
1735 | for (cnt--; cnt >= 0; cnt--) { | |
1736 | if (!dquots[cnt]) | |
1737 | continue; | |
1738 | /* Back out changes we already did */ | |
1739 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1740 | dquots[cnt]->dq_dqb.dqb_curinodes--; | |
1741 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1742 | } | |
1da177e4 | 1743 | goto warn_put_all; |
7b9ca4c6 | 1744 | } |
1da177e4 | 1745 | } |
efd8f0e6 | 1746 | |
1da177e4 | 1747 | warn_put_all: |
7b9ca4c6 | 1748 | spin_unlock(&inode->i_lock); |
63936dda | 1749 | if (ret == 0) |
bf097aaf | 1750 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1751 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1752 | flush_warnings(warn); |
1da177e4 LT |
1753 | return ret; |
1754 | } | |
08d0350c | 1755 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1756 | |
5dd4056d CH |
1757 | /* |
1758 | * Convert in-memory reserved quotas to real consumed quotas | |
1759 | */ | |
1760 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1761 | { |
5bcd3b6f | 1762 | struct dquot **dquots; |
b9ba6f94 | 1763 | int cnt, index; |
740d9dcd | 1764 | |
189eef59 | 1765 | if (!dquot_active(inode)) { |
0ed60de3 JK |
1766 | spin_lock(&inode->i_lock); |
1767 | *inode_reserved_space(inode) -= number; | |
1768 | __inode_add_bytes(inode, number); | |
1769 | spin_unlock(&inode->i_lock); | |
5dd4056d | 1770 | return 0; |
740d9dcd MC |
1771 | } |
1772 | ||
5bcd3b6f | 1773 | dquots = i_dquot(inode); |
b9ba6f94 | 1774 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1775 | spin_lock(&inode->i_lock); |
740d9dcd MC |
1776 | /* Claim reserved quotas to allocated quotas */ |
1777 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1778 | if (dquots[cnt]) { |
1779 | struct dquot *dquot = dquots[cnt]; | |
1780 | ||
7b9ca4c6 | 1781 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1782 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) |
1783 | number = dquot->dq_dqb.dqb_rsvspace; | |
1784 | dquot->dq_dqb.dqb_curspace += number; | |
1785 | dquot->dq_dqb.dqb_rsvspace -= number; | |
7b9ca4c6 | 1786 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1787 | } |
740d9dcd MC |
1788 | } |
1789 | /* Update inode bytes */ | |
0ed60de3 JK |
1790 | *inode_reserved_space(inode) -= number; |
1791 | __inode_add_bytes(inode, number); | |
1792 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1793 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1794 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1795 | return 0; |
740d9dcd | 1796 | } |
5dd4056d | 1797 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1798 | |
1c8924eb JK |
1799 | /* |
1800 | * Convert allocated space back to in-memory reserved quotas | |
1801 | */ | |
1802 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1803 | { | |
5bcd3b6f | 1804 | struct dquot **dquots; |
b9ba6f94 | 1805 | int cnt, index; |
1c8924eb JK |
1806 | |
1807 | if (!dquot_active(inode)) { | |
0ed60de3 JK |
1808 | spin_lock(&inode->i_lock); |
1809 | *inode_reserved_space(inode) += number; | |
1810 | __inode_sub_bytes(inode, number); | |
1811 | spin_unlock(&inode->i_lock); | |
1c8924eb JK |
1812 | return; |
1813 | } | |
1814 | ||
5bcd3b6f | 1815 | dquots = i_dquot(inode); |
b9ba6f94 | 1816 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1817 | spin_lock(&inode->i_lock); |
1c8924eb JK |
1818 | /* Claim reserved quotas to allocated quotas */ |
1819 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1820 | if (dquots[cnt]) { |
1821 | struct dquot *dquot = dquots[cnt]; | |
1822 | ||
7b9ca4c6 | 1823 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1824 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) |
1825 | number = dquot->dq_dqb.dqb_curspace; | |
1826 | dquot->dq_dqb.dqb_rsvspace += number; | |
1827 | dquot->dq_dqb.dqb_curspace -= number; | |
7b9ca4c6 | 1828 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1829 | } |
1c8924eb JK |
1830 | } |
1831 | /* Update inode bytes */ | |
0ed60de3 JK |
1832 | *inode_reserved_space(inode) += number; |
1833 | __inode_sub_bytes(inode, number); | |
1834 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1835 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1836 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1837 | return; |
1838 | } | |
1839 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1840 | ||
1da177e4 LT |
1841 | /* |
1842 | * This operation can block, but only after everything is updated | |
1843 | */ | |
56246f9a | 1844 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1845 | { |
1846 | unsigned int cnt; | |
bf097aaf | 1847 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1848 | struct dquot **dquots; |
b9ba6f94 | 1849 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1850 | |
189eef59 | 1851 | if (!dquot_active(inode)) { |
a478e522 JK |
1852 | if (reserve) { |
1853 | spin_lock(&inode->i_lock); | |
1854 | *inode_reserved_space(inode) -= number; | |
1855 | spin_unlock(&inode->i_lock); | |
1856 | } else { | |
1857 | inode_sub_bytes(inode, number); | |
1858 | } | |
5dd4056d | 1859 | return; |
1da177e4 | 1860 | } |
657d3bfa | 1861 | |
5bcd3b6f | 1862 | dquots = i_dquot(inode); |
b9ba6f94 | 1863 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1864 | spin_lock(&inode->i_lock); |
1da177e4 | 1865 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1866 | int wtype; |
1867 | ||
1868 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1869 | if (!dquots[cnt]) | |
1da177e4 | 1870 | continue; |
7b9ca4c6 | 1871 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1872 | wtype = info_bdq_free(dquots[cnt], number); |
1873 | if (wtype != QUOTA_NL_NOWARN) | |
1874 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1875 | if (reserve) |
bf097aaf | 1876 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1877 | else |
bf097aaf | 1878 | dquot_decr_space(dquots[cnt], number); |
7b9ca4c6 | 1879 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1880 | } |
7b9ca4c6 | 1881 | if (reserve) |
a478e522 | 1882 | *inode_reserved_space(inode) -= number; |
7b9ca4c6 JK |
1883 | else |
1884 | __inode_sub_bytes(inode, number); | |
1885 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 DM |
1886 | |
1887 | if (reserve) | |
1888 | goto out_unlock; | |
bf097aaf | 1889 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1890 | out_unlock: |
b9ba6f94 | 1891 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1892 | flush_warnings(warn); |
fd8fbfc1 | 1893 | } |
5dd4056d | 1894 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1895 | |
1da177e4 LT |
1896 | /* |
1897 | * This operation can block, but only after everything is updated | |
1898 | */ | |
6bab3596 | 1899 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1900 | { |
1901 | unsigned int cnt; | |
bf097aaf | 1902 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1903 | struct dquot * const *dquots; |
b9ba6f94 | 1904 | int index; |
1da177e4 | 1905 | |
189eef59 | 1906 | if (!dquot_active(inode)) |
63936dda | 1907 | return; |
657d3bfa | 1908 | |
5bcd3b6f | 1909 | dquots = i_dquot(inode); |
b9ba6f94 | 1910 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1911 | spin_lock(&inode->i_lock); |
1da177e4 | 1912 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1913 | int wtype; |
1914 | ||
1915 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1916 | if (!dquots[cnt]) | |
1da177e4 | 1917 | continue; |
7b9ca4c6 | 1918 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1919 | wtype = info_idq_free(dquots[cnt], 1); |
1920 | if (wtype != QUOTA_NL_NOWARN) | |
1921 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1922 | dquot_decr_inodes(dquots[cnt], 1); | |
7b9ca4c6 | 1923 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1924 | } |
7b9ca4c6 | 1925 | spin_unlock(&inode->i_lock); |
bf097aaf | 1926 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1927 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1928 | flush_warnings(warn); |
1da177e4 | 1929 | } |
08d0350c | 1930 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1931 | |
1932 | /* | |
1933 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1934 | * On success, dquot references in transfer_to are consumed and references |
1935 | * to original dquots that need to be released are placed there. On failure, | |
1936 | * references are kept untouched. | |
1da177e4 LT |
1937 | * |
1938 | * This operation can block, but only after everything is updated | |
1939 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1940 | * |
b9ba6f94 NY |
1941 | * We are holding reference on transfer_from & transfer_to, no need to |
1942 | * protect them by srcu_read_lock(). | |
1da177e4 | 1943 | */ |
bc8e5f07 | 1944 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1945 | { |
7b9ca4c6 | 1946 | qsize_t cur_space; |
740d9dcd | 1947 | qsize_t rsv_space = 0; |
7a9ca53a | 1948 | qsize_t inode_usage = 1; |
bc8e5f07 | 1949 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1950 | int cnt, ret = 0; |
9e32784b | 1951 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1952 | struct dquot_warn warn_to[MAXQUOTAS]; |
1953 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1954 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1955 | |
1da177e4 | 1956 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1957 | return 0; |
7a9ca53a TE |
1958 | |
1959 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1960 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1961 | if (ret) | |
1962 | return ret; | |
1963 | } | |
1964 | ||
cc33412f | 1965 | /* Initialize the arrays */ |
bf097aaf JK |
1966 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1967 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1968 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1969 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1970 | } | |
b9ba6f94 NY |
1971 | |
1972 | spin_lock(&dq_data_lock); | |
7b9ca4c6 | 1973 | spin_lock(&inode->i_lock); |
cc33412f | 1974 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
7b9ca4c6 | 1975 | spin_unlock(&inode->i_lock); |
b9ba6f94 | 1976 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1977 | return 0; |
cc33412f | 1978 | } |
7b9ca4c6 JK |
1979 | cur_space = __inode_get_bytes(inode); |
1980 | rsv_space = __inode_get_rsv_space(inode); | |
1981 | /* | |
1982 | * Build the transfer_from list, check limits, and update usage in | |
1983 | * the target structures. | |
1984 | */ | |
1da177e4 | 1985 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b D |
1986 | /* |
1987 | * Skip changes for same uid or gid or for turned off quota-type. | |
1988 | */ | |
dd6f3c6d | 1989 | if (!transfer_to[cnt]) |
1da177e4 | 1990 | continue; |
9e32784b D |
1991 | /* Avoid races with quotaoff() */ |
1992 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1993 | continue; | |
1994 | is_valid[cnt] = 1; | |
2d0fa467 | 1995 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7b9ca4c6 JK |
1996 | ret = dquot_add_inodes(transfer_to[cnt], inode_usage, |
1997 | &warn_to[cnt]); | |
efd8f0e6 CH |
1998 | if (ret) |
1999 | goto over_quota; | |
970ba546 | 2000 | ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, |
2001 | DQUOT_SPACE_WARN, &warn_to[cnt]); | |
7b9ca4c6 | 2002 | if (ret) { |
0a51fb71 | 2003 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); |
7b9ca4c6 | 2004 | dquot_decr_inodes(transfer_to[cnt], inode_usage); |
0a51fb71 | 2005 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); |
cc33412f | 2006 | goto over_quota; |
7b9ca4c6 | 2007 | } |
1da177e4 LT |
2008 | } |
2009 | ||
7b9ca4c6 | 2010 | /* Decrease usage for source structures and update quota pointers */ |
1da177e4 | 2011 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b | 2012 | if (!is_valid[cnt]) |
1da177e4 | 2013 | continue; |
1da177e4 LT |
2014 | /* Due to IO error we might not have transfer_from[] structure */ |
2015 | if (transfer_from[cnt]) { | |
bf097aaf | 2016 | int wtype; |
7b9ca4c6 JK |
2017 | |
2018 | spin_lock(&transfer_from[cnt]->dq_dqb_lock); | |
7a9ca53a | 2019 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
2020 | if (wtype != QUOTA_NL_NOWARN) |
2021 | prepare_warning(&warn_from_inodes[cnt], | |
2022 | transfer_from[cnt], wtype); | |
7b9ca4c6 JK |
2023 | wtype = info_bdq_free(transfer_from[cnt], |
2024 | cur_space + rsv_space); | |
bf097aaf JK |
2025 | if (wtype != QUOTA_NL_NOWARN) |
2026 | prepare_warning(&warn_from_space[cnt], | |
2027 | transfer_from[cnt], wtype); | |
7a9ca53a | 2028 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
2029 | dquot_decr_space(transfer_from[cnt], cur_space); |
2030 | dquot_free_reserved_space(transfer_from[cnt], | |
2031 | rsv_space); | |
7b9ca4c6 | 2032 | spin_unlock(&transfer_from[cnt]->dq_dqb_lock); |
1da177e4 | 2033 | } |
2d0fa467 | 2034 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 2035 | } |
7b9ca4c6 | 2036 | spin_unlock(&inode->i_lock); |
1da177e4 | 2037 | spin_unlock(&dq_data_lock); |
cc33412f | 2038 | |
dc52dd3a DM |
2039 | mark_all_dquot_dirty(transfer_from); |
2040 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
2041 | flush_warnings(warn_to); |
2042 | flush_warnings(warn_from_inodes); | |
2043 | flush_warnings(warn_from_space); | |
bc8e5f07 | 2044 | /* Pass back references to put */ |
dc52dd3a | 2045 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
2046 | if (is_valid[cnt]) |
2047 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 2048 | return 0; |
cc33412f | 2049 | over_quota: |
7b9ca4c6 JK |
2050 | /* Back out changes we already did */ |
2051 | for (cnt--; cnt >= 0; cnt--) { | |
2052 | if (!is_valid[cnt]) | |
2053 | continue; | |
2054 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); | |
2055 | dquot_decr_inodes(transfer_to[cnt], inode_usage); | |
2056 | dquot_decr_space(transfer_to[cnt], cur_space); | |
2057 | dquot_free_reserved_space(transfer_to[cnt], rsv_space); | |
2058 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); | |
2059 | } | |
2060 | spin_unlock(&inode->i_lock); | |
cc33412f | 2061 | spin_unlock(&dq_data_lock); |
bf097aaf | 2062 | flush_warnings(warn_to); |
86f3cbec | 2063 | return ret; |
1da177e4 | 2064 | } |
bc8e5f07 | 2065 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2066 | |
8ddd69d6 DM |
2067 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2068 | * Called from FSXXX_setattr() | |
2069 | */ | |
b43fa828 | 2070 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2071 | { |
bc8e5f07 | 2072 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2073 | struct dquot *dquot; |
bc8e5f07 JK |
2074 | struct super_block *sb = inode->i_sb; |
2075 | int ret; | |
8ddd69d6 | 2076 | |
189eef59 | 2077 | if (!dquot_active(inode)) |
bc8e5f07 | 2078 | return 0; |
12755627 | 2079 | |
6184fc0b JK |
2080 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2081 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2082 | if (IS_ERR(dquot)) { | |
2083 | if (PTR_ERR(dquot) != -ESRCH) { | |
2084 | ret = PTR_ERR(dquot); | |
2085 | goto out_put; | |
2086 | } | |
2087 | dquot = NULL; | |
2088 | } | |
2089 | transfer_to[USRQUOTA] = dquot; | |
2090 | } | |
2091 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2092 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2093 | if (IS_ERR(dquot)) { | |
2094 | if (PTR_ERR(dquot) != -ESRCH) { | |
2095 | ret = PTR_ERR(dquot); | |
2096 | goto out_put; | |
2097 | } | |
2098 | dquot = NULL; | |
2099 | } | |
2100 | transfer_to[GRPQUOTA] = dquot; | |
2101 | } | |
bc8e5f07 | 2102 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2103 | out_put: |
bc8e5f07 JK |
2104 | dqput_all(transfer_to); |
2105 | return ret; | |
b85f4b87 | 2106 | } |
b43fa828 | 2107 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2108 | |
1da177e4 LT |
2109 | /* |
2110 | * Write info of quota file to disk | |
2111 | */ | |
2112 | int dquot_commit_info(struct super_block *sb, int type) | |
2113 | { | |
1da177e4 LT |
2114 | struct quota_info *dqopt = sb_dqopt(sb); |
2115 | ||
9a8ae30e | 2116 | return dqopt->ops[type]->write_file_info(sb, type); |
1da177e4 | 2117 | } |
08d0350c | 2118 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2119 | |
be6257b2 JK |
2120 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2121 | { | |
2122 | struct quota_info *dqopt = sb_dqopt(sb); | |
be6257b2 | 2123 | |
9d1ccbe7 JK |
2124 | if (!sb_has_quota_active(sb, qid->type)) |
2125 | return -ESRCH; | |
2126 | if (!dqopt->ops[qid->type]->get_next_id) | |
2127 | return -ENOSYS; | |
f14618c6 | 2128 | return dqopt->ops[qid->type]->get_next_id(sb, qid); |
be6257b2 JK |
2129 | } |
2130 | EXPORT_SYMBOL(dquot_get_next_id); | |
2131 | ||
1da177e4 LT |
2132 | /* |
2133 | * Definitions of diskquota operations. | |
2134 | */ | |
61e225dc | 2135 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2136 | .write_dquot = dquot_commit, |
2137 | .acquire_dquot = dquot_acquire, | |
2138 | .release_dquot = dquot_release, | |
2139 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2140 | .write_info = dquot_commit_info, |
2141 | .alloc_dquot = dquot_alloc, | |
2142 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2143 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2144 | }; |
123e9caf | 2145 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2146 | |
907f4554 CH |
2147 | /* |
2148 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2149 | */ | |
2150 | int dquot_file_open(struct inode *inode, struct file *file) | |
2151 | { | |
2152 | int error; | |
2153 | ||
2154 | error = generic_file_open(inode, file); | |
2155 | if (!error && (file->f_mode & FMODE_WRITE)) | |
88d8ff97 | 2156 | error = dquot_initialize(inode); |
907f4554 CH |
2157 | return error; |
2158 | } | |
2159 | EXPORT_SYMBOL(dquot_file_open); | |
2160 | ||
1da177e4 LT |
2161 | /* |
2162 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2163 | */ | |
0f0dd62f | 2164 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2165 | { |
0ff5af83 | 2166 | int cnt, ret = 0; |
1da177e4 LT |
2167 | struct quota_info *dqopt = sb_dqopt(sb); |
2168 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2169 | |
7d6cd73d JK |
2170 | /* s_umount should be held in exclusive mode */ |
2171 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2172 | up_read(&sb->s_umount); | |
2173 | ||
f55abc0f JK |
2174 | /* Cannot turn off usage accounting without turning off limits, or |
2175 | * suspend quotas and simultaneously turn quotas off. */ | |
2176 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2177 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2178 | DQUOT_USAGE_ENABLED))) | |
2179 | return -EINVAL; | |
2180 | ||
9377abd0 JK |
2181 | /* |
2182 | * Skip everything if there's nothing to do. We have to do this because | |
2183 | * sometimes we are called when fill_super() failed and calling | |
2184 | * sync_fs() in such cases does no good. | |
2185 | */ | |
c3b00446 | 2186 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2187 | return 0; |
c3b00446 | 2188 | |
1da177e4 LT |
2189 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2190 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2191 | if (type != -1 && cnt != type) |
2192 | continue; | |
f55abc0f | 2193 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2194 | continue; |
f55abc0f JK |
2195 | |
2196 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2197 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2198 | dqopt->flags |= |
2199 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2200 | spin_unlock(&dq_state_lock); |
f55abc0f | 2201 | } else { |
cc33412f | 2202 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2203 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2204 | /* Turning off suspended quotas? */ | |
2205 | if (!sb_has_quota_loaded(sb, cnt) && | |
2206 | sb_has_quota_suspended(sb, cnt)) { | |
2207 | dqopt->flags &= ~dquot_state_flag( | |
2208 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2209 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2210 | iput(dqopt->files[cnt]); |
2211 | dqopt->files[cnt] = NULL; | |
2212 | continue; | |
2213 | } | |
cc33412f | 2214 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2215 | } |
f55abc0f JK |
2216 | |
2217 | /* We still have to keep quota loaded? */ | |
2218 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2219 | continue; |
1da177e4 LT |
2220 | |
2221 | /* Note: these are blocking operations */ | |
2222 | drop_dquot_ref(sb, cnt); | |
2223 | invalidate_dquots(sb, cnt); | |
2224 | /* | |
268157ba JK |
2225 | * Now all dquots should be invalidated, all writes done so we |
2226 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2227 | */ |
2228 | if (info_dirty(&dqopt->info[cnt])) | |
2229 | sb->dq_op->write_info(sb, cnt); | |
2230 | if (dqopt->ops[cnt]->free_file_info) | |
2231 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2232 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2233 | ||
2234 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2235 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2236 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2237 | dqopt->info[cnt].dqi_flags = 0; |
2238 | dqopt->info[cnt].dqi_igrace = 0; | |
2239 | dqopt->info[cnt].dqi_bgrace = 0; | |
2240 | dqopt->ops[cnt] = NULL; | |
2241 | } | |
ca785ec6 JK |
2242 | |
2243 | /* Skip syncing and setting flags if quota files are hidden */ | |
2244 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2245 | goto put_inodes; | |
2246 | ||
1da177e4 | 2247 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2248 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2249 | if (sb->s_op->sync_fs) |
2250 | sb->s_op->sync_fs(sb, 1); | |
2251 | sync_blockdev(sb->s_bdev); | |
2252 | /* Now the quota files are just ordinary files and we can set the | |
2253 | * inode flags back. Moreover we discard the pagecache so that | |
2254 | * userspace sees the writes we did bypassing the pagecache. We | |
2255 | * must also discard the blockdev buffers so that we see the | |
2256 | * changes done by userspace on the next quotaon() */ | |
2257 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2700e606 JK |
2258 | /* This can happen when suspending quotas on remount-ro... */ |
2259 | if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { | |
c3b00446 | 2260 | inode_lock(toputinode[cnt]); |
aad6cde9 | 2261 | toputinode[cnt]->i_flags &= ~S_NOQUOTA; |
c3b00446 JK |
2262 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); |
2263 | inode_unlock(toputinode[cnt]); | |
2264 | mark_inode_dirty_sync(toputinode[cnt]); | |
ca785ec6 JK |
2265 | } |
2266 | if (sb->s_bdev) | |
2267 | invalidate_bdev(sb->s_bdev); | |
2268 | put_inodes: | |
2269 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2270 | if (toputinode[cnt]) { | |
0ff5af83 | 2271 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2272 | * can reenable quota on the subsequent remount RW. We |
2273 | * have to check 'flags' variable and not use sb_has_ | |
2274 | * function because another quotaon / quotaoff could | |
2275 | * change global state before we got here. We refuse | |
2276 | * to suspend quotas when there is pending delete on | |
2277 | * the quota file... */ | |
2278 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2279 | iput(toputinode[cnt]); |
2280 | else if (!toputinode[cnt]->i_nlink) | |
2281 | ret = -EBUSY; | |
1da177e4 | 2282 | } |
0ff5af83 | 2283 | return ret; |
1da177e4 | 2284 | } |
0f0dd62f | 2285 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2286 | |
287a8095 | 2287 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2288 | { |
0f0dd62f CH |
2289 | return dquot_disable(sb, type, |
2290 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2291 | } |
287a8095 | 2292 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2293 | |
1da177e4 LT |
2294 | /* |
2295 | * Turn quotas on on a device | |
2296 | */ | |
2297 | ||
f55abc0f JK |
2298 | /* |
2299 | * Helper function to turn quotas on when we already have the inode of | |
2300 | * quota file and no quota information is loaded. | |
2301 | */ | |
2302 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2303 | unsigned int flags) | |
1da177e4 LT |
2304 | { |
2305 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2306 | struct super_block *sb = inode->i_sb; | |
2307 | struct quota_info *dqopt = sb_dqopt(sb); | |
2308 | int error; | |
1da177e4 LT |
2309 | |
2310 | if (!fmt) | |
2311 | return -ESRCH; | |
2312 | if (!S_ISREG(inode->i_mode)) { | |
2313 | error = -EACCES; | |
2314 | goto out_fmt; | |
2315 | } | |
2316 | if (IS_RDONLY(inode)) { | |
2317 | error = -EROFS; | |
2318 | goto out_fmt; | |
2319 | } | |
847aac64 LX |
2320 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2321 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2322 | error = -EINVAL; |
2323 | goto out_fmt; | |
2324 | } | |
5c004828 EB |
2325 | /* Filesystems outside of init_user_ns not yet supported */ |
2326 | if (sb->s_user_ns != &init_user_ns) { | |
2327 | error = -EINVAL; | |
2328 | goto out_fmt; | |
2329 | } | |
f55abc0f JK |
2330 | /* Usage always has to be set... */ |
2331 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2332 | error = -EINVAL; | |
2333 | goto out_fmt; | |
2334 | } | |
c3b00446 JK |
2335 | if (sb_has_quota_loaded(sb, type)) { |
2336 | error = -EBUSY; | |
2337 | goto out_fmt; | |
2338 | } | |
1da177e4 | 2339 | |
ca785ec6 | 2340 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2341 | /* As we bypass the pagecache we must now flush all the |
2342 | * dirty data and invalidate caches so that kernel sees | |
2343 | * changes from userspace. It is not enough to just flush | |
2344 | * the quota file since if blocksize < pagesize, invalidation | |
2345 | * of the cache could fail because of other unrelated dirty | |
2346 | * data */ | |
2347 | sync_filesystem(sb); | |
ca785ec6 JK |
2348 | invalidate_bdev(sb->s_bdev); |
2349 | } | |
ca785ec6 JK |
2350 | |
2351 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2352 | /* We don't want quota and atime on quota files (deadlocks | |
2353 | * possible) Also nobody should write to the file - we use | |
2354 | * special IO operations which ignore the immutable bit. */ | |
5955102c | 2355 | inode_lock(inode); |
aad6cde9 | 2356 | inode->i_flags |= S_NOQUOTA; |
5955102c | 2357 | inode_unlock(inode); |
26245c94 JK |
2358 | /* |
2359 | * When S_NOQUOTA is set, remove dquot references as no more | |
2360 | * references can be added | |
2361 | */ | |
9f754758 | 2362 | __dquot_drop(inode); |
ca785ec6 | 2363 | } |
1da177e4 LT |
2364 | |
2365 | error = -EIO; | |
2366 | dqopt->files[type] = igrab(inode); | |
2367 | if (!dqopt->files[type]) | |
c3b00446 | 2368 | goto out_file_flags; |
1da177e4 LT |
2369 | error = -EINVAL; |
2370 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2371 | goto out_file_init; | |
2372 | ||
2373 | dqopt->ops[type] = fmt->qf_ops; | |
2374 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2375 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2376 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
268157ba | 2377 | error = dqopt->ops[type]->read_file_info(sb, type); |
42fdb858 | 2378 | if (error < 0) |
1da177e4 | 2379 | goto out_file_init; |
15512377 JK |
2380 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { |
2381 | spin_lock(&dq_data_lock); | |
46fe44ce | 2382 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; |
15512377 JK |
2383 | spin_unlock(&dq_data_lock); |
2384 | } | |
cc33412f | 2385 | spin_lock(&dq_state_lock); |
f55abc0f | 2386 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2387 | spin_unlock(&dq_state_lock); |
1da177e4 | 2388 | |
1a6152d3 CY |
2389 | error = add_dquot_ref(sb, type); |
2390 | if (error) | |
2391 | dquot_disable(sb, type, flags); | |
1da177e4 | 2392 | |
1a6152d3 | 2393 | return error; |
1da177e4 LT |
2394 | out_file_init: |
2395 | dqopt->files[type] = NULL; | |
2396 | iput(inode); | |
c3b00446 | 2397 | out_file_flags: |
aad6cde9 JK |
2398 | inode_lock(inode); |
2399 | inode->i_flags &= ~S_NOQUOTA; | |
2400 | inode_unlock(inode); | |
1da177e4 LT |
2401 | out_fmt: |
2402 | put_quota_format(fmt); | |
2403 | ||
2404 | return error; | |
2405 | } | |
2406 | ||
0ff5af83 | 2407 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2408 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2409 | { |
2410 | struct quota_info *dqopt = sb_dqopt(sb); | |
2411 | struct inode *inode; | |
0f0dd62f | 2412 | int ret = 0, cnt; |
f55abc0f | 2413 | unsigned int flags; |
0ff5af83 | 2414 | |
7d6cd73d JK |
2415 | /* s_umount should be held in exclusive mode */ |
2416 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2417 | up_read(&sb->s_umount); | |
2418 | ||
0f0dd62f CH |
2419 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2420 | if (type != -1 && cnt != type) | |
2421 | continue; | |
c3b00446 | 2422 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2423 | continue; |
c3b00446 | 2424 | |
0f0dd62f CH |
2425 | inode = dqopt->files[cnt]; |
2426 | dqopt->files[cnt] = NULL; | |
2427 | spin_lock(&dq_state_lock); | |
2428 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2429 | DQUOT_LIMITS_ENABLED, | |
2430 | cnt); | |
2431 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2432 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2433 | |
0f0dd62f CH |
2434 | flags = dquot_generic_flag(flags, cnt); |
2435 | ret = vfs_load_quota_inode(inode, cnt, | |
2436 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2437 | iput(inode); | |
2438 | } | |
0ff5af83 JK |
2439 | |
2440 | return ret; | |
2441 | } | |
0f0dd62f | 2442 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2443 | |
f00c9e44 | 2444 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2445 | const struct path *path) |
77e69dac AV |
2446 | { |
2447 | int error = security_quota_on(path->dentry); | |
2448 | if (error) | |
2449 | return error; | |
2450 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2451 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2452 | error = -EXDEV; |
2453 | else | |
dea655c2 | 2454 | error = vfs_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2455 | format_id, DQUOT_USAGE_ENABLED | |
2456 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2457 | return error; |
2458 | } | |
287a8095 | 2459 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2460 | |
f55abc0f JK |
2461 | /* |
2462 | * More powerful function for turning on quotas allowing setting | |
2463 | * of individual quota flags | |
2464 | */ | |
287a8095 CH |
2465 | int dquot_enable(struct inode *inode, int type, int format_id, |
2466 | unsigned int flags) | |
f55abc0f | 2467 | { |
f55abc0f | 2468 | struct super_block *sb = inode->i_sb; |
f55abc0f JK |
2469 | |
2470 | /* Just unsuspend quotas? */ | |
0f0dd62f | 2471 | BUG_ON(flags & DQUOT_SUSPENDED); |
7d6cd73d JK |
2472 | /* s_umount should be held in exclusive mode */ |
2473 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2474 | up_read(&sb->s_umount); | |
0f0dd62f | 2475 | |
f55abc0f JK |
2476 | if (!flags) |
2477 | return 0; | |
2478 | /* Just updating flags needed? */ | |
2479 | if (sb_has_quota_loaded(sb, type)) { | |
f55abc0f | 2480 | if (flags & DQUOT_USAGE_ENABLED && |
c3b00446 JK |
2481 | sb_has_quota_usage_enabled(sb, type)) |
2482 | return -EBUSY; | |
f55abc0f | 2483 | if (flags & DQUOT_LIMITS_ENABLED && |
c3b00446 JK |
2484 | sb_has_quota_limits_enabled(sb, type)) |
2485 | return -EBUSY; | |
cc33412f | 2486 | spin_lock(&dq_state_lock); |
f55abc0f | 2487 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2488 | spin_unlock(&dq_state_lock); |
c3b00446 | 2489 | return 0; |
f55abc0f JK |
2490 | } |
2491 | ||
f55abc0f JK |
2492 | return vfs_load_quota_inode(inode, type, format_id, flags); |
2493 | } | |
287a8095 | 2494 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2495 | |
1da177e4 LT |
2496 | /* |
2497 | * This function is used when filesystem needs to initialize quotas | |
2498 | * during mount time. | |
2499 | */ | |
287a8095 | 2500 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2501 | int format_id, int type) |
1da177e4 | 2502 | { |
84de856e | 2503 | struct dentry *dentry; |
1da177e4 LT |
2504 | int error; |
2505 | ||
e12a4e8a | 2506 | dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2507 | if (IS_ERR(dentry)) |
2508 | return PTR_ERR(dentry); | |
2509 | ||
dea655c2 | 2510 | if (d_really_is_negative(dentry)) { |
154f484b JK |
2511 | error = -ENOENT; |
2512 | goto out; | |
2513 | } | |
2514 | ||
1da177e4 | 2515 | error = security_quota_on(dentry); |
84de856e | 2516 | if (!error) |
dea655c2 | 2517 | error = vfs_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2518 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2519 | |
154f484b | 2520 | out: |
84de856e CH |
2521 | dput(dentry); |
2522 | return error; | |
1da177e4 | 2523 | } |
287a8095 | 2524 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2525 | |
3e2af67e JK |
2526 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2527 | { | |
2528 | int ret; | |
2529 | int type; | |
2530 | struct quota_info *dqopt = sb_dqopt(sb); | |
2531 | ||
2532 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2533 | return -ENOSYS; | |
2534 | /* Accounting cannot be turned on while fs is mounted */ | |
2535 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2536 | if (!flags) | |
2537 | return -EINVAL; | |
2538 | for (type = 0; type < MAXQUOTAS; type++) { | |
2539 | if (!(flags & qtype_enforce_flag(type))) | |
2540 | continue; | |
2541 | /* Can't enforce without accounting */ | |
2542 | if (!sb_has_quota_usage_enabled(sb, type)) | |
2543 | return -EINVAL; | |
2544 | ret = dquot_enable(dqopt->files[type], type, | |
2545 | dqopt->info[type].dqi_fmt_id, | |
2546 | DQUOT_LIMITS_ENABLED); | |
2547 | if (ret < 0) | |
2548 | goto out_err; | |
2549 | } | |
2550 | return 0; | |
2551 | out_err: | |
2552 | /* Backout enforcement enablement we already did */ | |
2553 | for (type--; type >= 0; type--) { | |
2554 | if (flags & qtype_enforce_flag(type)) | |
2555 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2556 | } | |
2557 | /* Error code translation for better compatibility with XFS */ | |
2558 | if (ret == -EBUSY) | |
2559 | ret = -EEXIST; | |
2560 | return ret; | |
2561 | } | |
2562 | ||
2563 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2564 | { | |
2565 | int ret; | |
2566 | int type; | |
2567 | struct quota_info *dqopt = sb_dqopt(sb); | |
2568 | ||
2569 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2570 | return -ENOSYS; | |
2571 | /* | |
2572 | * We don't support turning off accounting via quotactl. In principle | |
2573 | * quota infrastructure can do this but filesystems don't expect | |
2574 | * userspace to be able to do it. | |
2575 | */ | |
2576 | if (flags & | |
2577 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2578 | return -EOPNOTSUPP; | |
2579 | ||
2580 | /* Filter out limits not enabled */ | |
2581 | for (type = 0; type < MAXQUOTAS; type++) | |
2582 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2583 | flags &= ~qtype_enforce_flag(type); | |
2584 | /* Nothing left? */ | |
2585 | if (!flags) | |
2586 | return -EEXIST; | |
2587 | for (type = 0; type < MAXQUOTAS; type++) { | |
2588 | if (flags & qtype_enforce_flag(type)) { | |
2589 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2590 | if (ret < 0) | |
2591 | goto out_err; | |
2592 | } | |
2593 | } | |
2594 | return 0; | |
2595 | out_err: | |
2596 | /* Backout enforcement disabling we already did */ | |
2597 | for (type--; type >= 0; type--) { | |
2598 | if (flags & qtype_enforce_flag(type)) | |
2599 | dquot_enable(dqopt->files[type], type, | |
2600 | dqopt->info[type].dqi_fmt_id, | |
2601 | DQUOT_LIMITS_ENABLED); | |
2602 | } | |
2603 | return ret; | |
2604 | } | |
2605 | ||
1da177e4 | 2606 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2607 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2608 | { |
2609 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2610 | ||
b9b2dd36 | 2611 | memset(di, 0, sizeof(*di)); |
7b9ca4c6 | 2612 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2613 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2614 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2615 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2616 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2617 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2618 | di->d_ino_count = dm->dqb_curinodes; | |
2619 | di->d_spc_timer = dm->dqb_btime; | |
2620 | di->d_ino_timer = dm->dqb_itime; | |
7b9ca4c6 | 2621 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 LT |
2622 | } |
2623 | ||
74a8a103 | 2624 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2625 | struct qc_dqblk *di) |
1da177e4 LT |
2626 | { |
2627 | struct dquot *dquot; | |
2628 | ||
aca645a6 | 2629 | dquot = dqget(sb, qid); |
6184fc0b JK |
2630 | if (IS_ERR(dquot)) |
2631 | return PTR_ERR(dquot); | |
1da177e4 LT |
2632 | do_get_dqblk(dquot, di); |
2633 | dqput(dquot); | |
cc33412f | 2634 | |
1da177e4 LT |
2635 | return 0; |
2636 | } | |
287a8095 | 2637 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2638 | |
be6257b2 JK |
2639 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2640 | struct qc_dqblk *di) | |
2641 | { | |
2642 | struct dquot *dquot; | |
2643 | int err; | |
2644 | ||
2645 | if (!sb->dq_op->get_next_id) | |
2646 | return -ENOSYS; | |
2647 | err = sb->dq_op->get_next_id(sb, qid); | |
2648 | if (err < 0) | |
2649 | return err; | |
2650 | dquot = dqget(sb, *qid); | |
2651 | if (IS_ERR(dquot)) | |
2652 | return PTR_ERR(dquot); | |
2653 | do_get_dqblk(dquot, di); | |
2654 | dqput(dquot); | |
2655 | ||
2656 | return 0; | |
2657 | } | |
2658 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2659 | ||
14bf61ff JK |
2660 | #define VFS_QC_MASK \ |
2661 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2662 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2663 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2664 | |
1da177e4 | 2665 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2666 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2667 | { |
2668 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2669 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2670 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2671 | |
14bf61ff | 2672 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2673 | return -EINVAL; |
2674 | ||
14bf61ff | 2675 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2676 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2677 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2678 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2679 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2680 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2681 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2682 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2683 | return -ERANGE; |
1da177e4 | 2684 | |
7b9ca4c6 | 2685 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2686 | if (di->d_fieldmask & QC_SPACE) { |
2687 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2688 | check_blim = 1; |
08261673 | 2689 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2690 | } |
c472b432 | 2691 | |
14bf61ff JK |
2692 | if (di->d_fieldmask & QC_SPC_SOFT) |
2693 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2694 | if (di->d_fieldmask & QC_SPC_HARD) | |
2695 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2696 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2697 | check_blim = 1; |
08261673 | 2698 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2699 | } |
c472b432 | 2700 | |
14bf61ff JK |
2701 | if (di->d_fieldmask & QC_INO_COUNT) { |
2702 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2703 | check_ilim = 1; |
08261673 | 2704 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2705 | } |
c472b432 | 2706 | |
14bf61ff | 2707 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2708 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2709 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2710 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2711 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2712 | check_ilim = 1; |
08261673 | 2713 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2714 | } |
c472b432 | 2715 | |
14bf61ff JK |
2716 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2717 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2718 | check_blim = 1; |
08261673 | 2719 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2720 | } |
c472b432 | 2721 | |
14bf61ff JK |
2722 | if (di->d_fieldmask & QC_INO_TIMER) { |
2723 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2724 | check_ilim = 1; |
08261673 | 2725 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2726 | } |
1da177e4 LT |
2727 | |
2728 | if (check_blim) { | |
268157ba | 2729 | if (!dm->dqb_bsoftlimit || |
41e327b5 | 2730 | dm->dqb_curspace + dm->dqb_rsvspace < dm->dqb_bsoftlimit) { |
1da177e4 LT |
2731 | dm->dqb_btime = 0; |
2732 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2733 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2734 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2735 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2736 | } |
2737 | if (check_ilim) { | |
268157ba JK |
2738 | if (!dm->dqb_isoftlimit || |
2739 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2740 | dm->dqb_itime = 0; |
2741 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2742 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2743 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2744 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2745 | } |
268157ba JK |
2746 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2747 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2748 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2749 | else | |
2750 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
7b9ca4c6 | 2751 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 | 2752 | mark_dquot_dirty(dquot); |
338bf9af AP |
2753 | |
2754 | return 0; | |
1da177e4 LT |
2755 | } |
2756 | ||
74a8a103 | 2757 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2758 | struct qc_dqblk *di) |
1da177e4 LT |
2759 | { |
2760 | struct dquot *dquot; | |
338bf9af | 2761 | int rc; |
1da177e4 | 2762 | |
aca645a6 | 2763 | dquot = dqget(sb, qid); |
6184fc0b JK |
2764 | if (IS_ERR(dquot)) { |
2765 | rc = PTR_ERR(dquot); | |
f55abc0f | 2766 | goto out; |
1da177e4 | 2767 | } |
338bf9af | 2768 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2769 | dqput(dquot); |
f55abc0f | 2770 | out: |
338bf9af | 2771 | return rc; |
1da177e4 | 2772 | } |
287a8095 | 2773 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2774 | |
2775 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2776 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2777 | { |
2778 | struct mem_dqinfo *mi; | |
0a240339 JK |
2779 | struct qc_type_state *tstate; |
2780 | struct quota_info *dqopt = sb_dqopt(sb); | |
2781 | int type; | |
1da177e4 | 2782 | |
0a240339 JK |
2783 | memset(state, 0, sizeof(*state)); |
2784 | for (type = 0; type < MAXQUOTAS; type++) { | |
2785 | if (!sb_has_quota_active(sb, type)) | |
2786 | continue; | |
2787 | tstate = state->s_state + type; | |
2788 | mi = sb_dqopt(sb)->info + type; | |
2789 | tstate->flags = QCI_ACCT_ENABLED; | |
2790 | spin_lock(&dq_data_lock); | |
2791 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2792 | tstate->flags |= QCI_SYSFILE; | |
2793 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2794 | tstate->flags |= QCI_ROOT_SQUASH; | |
2795 | if (sb_has_quota_limits_enabled(sb, type)) | |
2796 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2797 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2798 | tstate->ino_timelimit = mi->dqi_igrace; | |
2799 | tstate->ino = dqopt->files[type]->i_ino; | |
2800 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2801 | tstate->nextents = 1; /* We don't know... */ | |
2802 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2803 | } |
1da177e4 LT |
2804 | return 0; |
2805 | } | |
0a240339 | 2806 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2807 | |
2808 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2809 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2810 | { |
2811 | struct mem_dqinfo *mi; | |
f55abc0f | 2812 | int err = 0; |
1da177e4 | 2813 | |
5eacb2ac JK |
2814 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2815 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2816 | return -EINVAL; | |
9d1ccbe7 JK |
2817 | if (!sb_has_quota_active(sb, type)) |
2818 | return -ESRCH; | |
1da177e4 | 2819 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2820 | if (ii->i_fieldmask & QC_FLAGS) { |
2821 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2822 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2823 | return -EINVAL; | |
ca6cb091 | 2824 | } |
1da177e4 | 2825 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2826 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2827 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2828 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2829 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2830 | if (ii->i_fieldmask & QC_FLAGS) { | |
2831 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2832 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2833 | else | |
2834 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2835 | } | |
1da177e4 LT |
2836 | spin_unlock(&dq_data_lock); |
2837 | mark_info_dirty(sb, type); | |
2838 | /* Force write to disk */ | |
2839 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2840 | return err; |
1da177e4 | 2841 | } |
287a8095 | 2842 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2843 | |
3e2af67e JK |
2844 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2845 | .quota_enable = dquot_quota_enable, | |
2846 | .quota_disable = dquot_quota_disable, | |
2847 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2848 | .get_state = dquot_get_state, |
3e2af67e JK |
2849 | .set_info = dquot_set_dqinfo, |
2850 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2851 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2852 | .set_dqblk = dquot_set_dqblk |
2853 | }; | |
2854 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2855 | ||
dde95888 DM |
2856 | static int do_proc_dqstats(struct ctl_table *table, int write, |
2857 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2858 | { | |
dde95888 | 2859 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2860 | |
2861 | /* Update global table */ | |
2862 | dqstats.stat[type] = | |
2863 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2864 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2865 | } | |
2866 | ||
e628753b | 2867 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2868 | { |
1da177e4 | 2869 | .procname = "lookups", |
dde95888 | 2870 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2871 | .maxlen = sizeof(int), |
2872 | .mode = 0444, | |
dde95888 | 2873 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2874 | }, |
2875 | { | |
1da177e4 | 2876 | .procname = "drops", |
dde95888 | 2877 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2878 | .maxlen = sizeof(int), |
2879 | .mode = 0444, | |
dde95888 | 2880 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2881 | }, |
2882 | { | |
1da177e4 | 2883 | .procname = "reads", |
dde95888 | 2884 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2885 | .maxlen = sizeof(int), |
2886 | .mode = 0444, | |
dde95888 | 2887 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2888 | }, |
2889 | { | |
1da177e4 | 2890 | .procname = "writes", |
dde95888 | 2891 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2892 | .maxlen = sizeof(int), |
2893 | .mode = 0444, | |
dde95888 | 2894 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2895 | }, |
2896 | { | |
1da177e4 | 2897 | .procname = "cache_hits", |
dde95888 | 2898 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2899 | .maxlen = sizeof(int), |
2900 | .mode = 0444, | |
dde95888 | 2901 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2902 | }, |
2903 | { | |
1da177e4 | 2904 | .procname = "allocated_dquots", |
dde95888 | 2905 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2906 | .maxlen = sizeof(int), |
2907 | .mode = 0444, | |
dde95888 | 2908 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2909 | }, |
2910 | { | |
1da177e4 | 2911 | .procname = "free_dquots", |
dde95888 | 2912 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2913 | .maxlen = sizeof(int), |
2914 | .mode = 0444, | |
dde95888 | 2915 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2916 | }, |
2917 | { | |
1da177e4 | 2918 | .procname = "syncs", |
dde95888 | 2919 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2920 | .maxlen = sizeof(int), |
2921 | .mode = 0444, | |
dde95888 | 2922 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2923 | }, |
8e893469 | 2924 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2925 | { |
1da177e4 LT |
2926 | .procname = "warnings", |
2927 | .data = &flag_print_warnings, | |
2928 | .maxlen = sizeof(int), | |
2929 | .mode = 0644, | |
6d456111 | 2930 | .proc_handler = proc_dointvec, |
1da177e4 | 2931 | }, |
8e893469 | 2932 | #endif |
ab09203e | 2933 | { }, |
1da177e4 LT |
2934 | }; |
2935 | ||
e628753b | 2936 | static struct ctl_table fs_table[] = { |
1da177e4 | 2937 | { |
1da177e4 LT |
2938 | .procname = "quota", |
2939 | .mode = 0555, | |
2940 | .child = fs_dqstats_table, | |
2941 | }, | |
ab09203e | 2942 | { }, |
1da177e4 LT |
2943 | }; |
2944 | ||
e628753b | 2945 | static struct ctl_table sys_table[] = { |
1da177e4 | 2946 | { |
1da177e4 LT |
2947 | .procname = "fs", |
2948 | .mode = 0555, | |
2949 | .child = fs_table, | |
2950 | }, | |
ab09203e | 2951 | { }, |
1da177e4 LT |
2952 | }; |
2953 | ||
2954 | static int __init dquot_init(void) | |
2955 | { | |
f32764bd | 2956 | int i, ret; |
1da177e4 LT |
2957 | unsigned long nr_hash, order; |
2958 | ||
2959 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2960 | ||
0b4d4147 | 2961 | register_sysctl_table(sys_table); |
1da177e4 | 2962 | |
20c2df83 | 2963 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2964 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2965 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2966 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2967 | NULL); |
1da177e4 LT |
2968 | |
2969 | order = 0; | |
2970 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); | |
2971 | if (!dquot_hash) | |
2972 | panic("Cannot create dquot hash table"); | |
2973 | ||
f32764bd | 2974 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2975 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2976 | if (ret) |
2977 | panic("Cannot create dquot stat counters"); | |
2978 | } | |
dde95888 | 2979 | |
1da177e4 LT |
2980 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2981 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2982 | dq_hash_bits = 0; | |
2983 | do { | |
2984 | dq_hash_bits++; | |
2985 | } while (nr_hash >> dq_hash_bits); | |
2986 | dq_hash_bits--; | |
2987 | ||
2988 | nr_hash = 1UL << dq_hash_bits; | |
2989 | dq_hash_mask = nr_hash - 1; | |
2990 | for (i = 0; i < nr_hash; i++) | |
2991 | INIT_HLIST_HEAD(dquot_hash + i); | |
2992 | ||
19858e7b AB |
2993 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2994 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2995 | |
88bc0ede TH |
2996 | if (register_shrinker(&dqcache_shrinker)) |
2997 | panic("Cannot register dquot shrinker"); | |
1da177e4 LT |
2998 | |
2999 | return 0; | |
3000 | } | |
331221fa | 3001 | fs_initcall(dquot_init); |