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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Implementation of the diskquota system for the LINUX operating system. QUOTA | |
4 | * is implemented using the BSD system call interface as the means of | |
5 | * communication with the user level. This file contains the generic routines | |
6 | * called by the different filesystems on allocation of an inode or block. | |
7 | * These routines take care of the administration needed to have a consistent | |
8 | * diskquota tracking system. The ideas of both user and group quotas are based | |
9 | * on the Melbourne quota system as used on BSD derived systems. The internal | |
10 | * implementation is based on one of the several variants of the LINUX | |
11 | * inode-subsystem with added complexity of the diskquota system. | |
27942ef5 | 12 | * |
1da177e4 LT |
13 | * Author: Marco van Wieringen <mvw@planets.elm.net> |
14 | * | |
15 | * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 | |
16 | * | |
17 | * Revised list management to avoid races | |
18 | * -- Bill Hawes, <whawes@star.net>, 9/98 | |
19 | * | |
20 | * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). | |
21 | * As the consequence the locking was moved from dquot_decr_...(), | |
22 | * dquot_incr_...() to calling functions. | |
23 | * invalidate_dquots() now writes modified dquots. | |
24 | * Serialized quota_off() and quota_on() for mount point. | |
25 | * Fixed a few bugs in grow_dquots(). | |
26 | * Fixed deadlock in write_dquot() - we no longer account quotas on | |
27 | * quota files | |
28 | * remove_dquot_ref() moved to inode.c - it now traverses through inodes | |
29 | * add_dquot_ref() restarts after blocking | |
30 | * Added check for bogus uid and fixed check for group in quotactl. | |
31 | * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 | |
32 | * | |
33 | * Used struct list_head instead of own list struct | |
34 | * Invalidation of referenced dquots is no longer possible | |
35 | * Improved free_dquots list management | |
36 | * Quota and i_blocks are now updated in one place to avoid races | |
37 | * Warnings are now delayed so we won't block in critical section | |
38 | * Write updated not to require dquot lock | |
39 | * Jan Kara, <jack@suse.cz>, 9/2000 | |
40 | * | |
41 | * Added dynamic quota structure allocation | |
42 | * Jan Kara <jack@suse.cz> 12/2000 | |
43 | * | |
44 | * Rewritten quota interface. Implemented new quota format and | |
45 | * formats registering. | |
46 | * Jan Kara, <jack@suse.cz>, 2001,2002 | |
47 | * | |
48 | * New SMP locking. | |
49 | * Jan Kara, <jack@suse.cz>, 10/2002 | |
50 | * | |
51 | * Added journalled quota support, fix lock inversion problems | |
52 | * Jan Kara, <jack@suse.cz>, 2003,2004 | |
53 | * | |
27942ef5 | 54 | * (C) Copyright 1994 - 1997 Marco van Wieringen |
1da177e4 LT |
55 | */ |
56 | ||
57 | #include <linux/errno.h> | |
58 | #include <linux/kernel.h> | |
59 | #include <linux/fs.h> | |
60 | #include <linux/mount.h> | |
61 | #include <linux/mm.h> | |
62 | #include <linux/time.h> | |
63 | #include <linux/types.h> | |
64 | #include <linux/string.h> | |
65 | #include <linux/fcntl.h> | |
66 | #include <linux/stat.h> | |
67 | #include <linux/tty.h> | |
68 | #include <linux/file.h> | |
69 | #include <linux/slab.h> | |
70 | #include <linux/sysctl.h> | |
1da177e4 LT |
71 | #include <linux/init.h> |
72 | #include <linux/module.h> | |
73 | #include <linux/proc_fs.h> | |
74 | #include <linux/security.h> | |
40401530 | 75 | #include <linux/sched.h> |
5b825c3a | 76 | #include <linux/cred.h> |
1da177e4 LT |
77 | #include <linux/kmod.h> |
78 | #include <linux/namei.h> | |
16f7e0fe | 79 | #include <linux/capability.h> |
be586bab | 80 | #include <linux/quotaops.h> |
55fa6091 | 81 | #include "../internal.h" /* ugh */ |
1da177e4 | 82 | |
f3da9310 | 83 | #include <linux/uaccess.h> |
1da177e4 | 84 | |
1da177e4 | 85 | /* |
7b9ca4c6 JK |
86 | * There are five quota SMP locks: |
87 | * * dq_list_lock protects all lists with quotas and quota formats. | |
88 | * * dquot->dq_dqb_lock protects data from dq_dqb | |
89 | * * inode->i_lock protects inode->i_blocks, i_bytes and also guards | |
90 | * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that | |
91 | * dquot_transfer() can stabilize amount it transfers | |
92 | * * dq_data_lock protects mem_dqinfo structures and modifications of dquot | |
93 | * pointers in the inode | |
94 | * * dq_state_lock protects modifications of quota state (on quotaon and | |
95 | * quotaoff) and readers who care about latest values take it as well. | |
1da177e4 | 96 | * |
7b9ca4c6 JK |
97 | * The spinlock ordering is hence: |
98 | * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock, | |
cc33412f | 99 | * dq_list_lock > dq_state_lock |
1da177e4 LT |
100 | * |
101 | * Note that some things (eg. sb pointer, type, id) doesn't change during | |
102 | * the life of the dquot structure and so needn't to be protected by a lock | |
103 | * | |
b9ba6f94 NY |
104 | * Operation accessing dquots via inode pointers are protected by dquot_srcu. |
105 | * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and | |
106 | * synchronize_srcu(&dquot_srcu) is called after clearing pointers from | |
107 | * inode and before dropping dquot references to avoid use of dquots after | |
108 | * they are freed. dq_data_lock is used to serialize the pointer setting and | |
109 | * clearing operations. | |
26245c94 JK |
110 | * Special care needs to be taken about S_NOQUOTA inode flag (marking that |
111 | * inode is a quota file). Functions adding pointers from inode to dquots have | |
b9ba6f94 NY |
112 | * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they |
113 | * have to do all pointer modifications before dropping dq_data_lock. This makes | |
26245c94 JK |
114 | * sure they cannot race with quotaon which first sets S_NOQUOTA flag and |
115 | * then drops all pointers to dquots from an inode. | |
1da177e4 | 116 | * |
5e8cb9b6 JK |
117 | * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to |
118 | * memory (or space for it is being allocated) on the first dqget(), when it is | |
119 | * being written out, and when it is being released on the last dqput(). The | |
120 | * allocation and release operations are serialized by the dq_lock and by | |
121 | * checking the use count in dquot_release(). | |
1da177e4 LT |
122 | * |
123 | * Lock ordering (including related VFS locks) is the following: | |
bc8230ee | 124 | * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem |
1da177e4 LT |
125 | */ |
126 | ||
c516610c JK |
127 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); |
128 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); | |
129 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); | |
08d0350c | 130 | EXPORT_SYMBOL(dq_data_lock); |
b9ba6f94 | 131 | DEFINE_STATIC_SRCU(dquot_srcu); |
1da177e4 | 132 | |
503330f3 JK |
133 | static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); |
134 | ||
fb5ffb0e | 135 | void __quota_error(struct super_block *sb, const char *func, |
055adcbd | 136 | const char *fmt, ...) |
fb5ffb0e | 137 | { |
fb5ffb0e | 138 | if (printk_ratelimit()) { |
055adcbd JP |
139 | va_list args; |
140 | struct va_format vaf; | |
141 | ||
fb5ffb0e | 142 | va_start(args, fmt); |
055adcbd JP |
143 | |
144 | vaf.fmt = fmt; | |
145 | vaf.va = &args; | |
146 | ||
147 | printk(KERN_ERR "Quota error (device %s): %s: %pV\n", | |
148 | sb->s_id, func, &vaf); | |
149 | ||
fb5ffb0e JZ |
150 | va_end(args); |
151 | } | |
152 | } | |
153 | EXPORT_SYMBOL(__quota_error); | |
154 | ||
da8d1ba2 | 155 | #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) |
1da177e4 | 156 | static char *quotatypes[] = INITQFNAMES; |
da8d1ba2 | 157 | #endif |
1da177e4 LT |
158 | static struct quota_format_type *quota_formats; /* List of registered formats */ |
159 | static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; | |
160 | ||
161 | /* SLAB cache for dquot structures */ | |
e18b890b | 162 | static struct kmem_cache *dquot_cachep; |
1da177e4 LT |
163 | |
164 | int register_quota_format(struct quota_format_type *fmt) | |
165 | { | |
166 | spin_lock(&dq_list_lock); | |
167 | fmt->qf_next = quota_formats; | |
168 | quota_formats = fmt; | |
169 | spin_unlock(&dq_list_lock); | |
170 | return 0; | |
171 | } | |
08d0350c | 172 | EXPORT_SYMBOL(register_quota_format); |
1da177e4 LT |
173 | |
174 | void unregister_quota_format(struct quota_format_type *fmt) | |
175 | { | |
176 | struct quota_format_type **actqf; | |
177 | ||
178 | spin_lock(&dq_list_lock); | |
268157ba JK |
179 | for (actqf = "a_formats; *actqf && *actqf != fmt; |
180 | actqf = &(*actqf)->qf_next) | |
181 | ; | |
1da177e4 LT |
182 | if (*actqf) |
183 | *actqf = (*actqf)->qf_next; | |
184 | spin_unlock(&dq_list_lock); | |
185 | } | |
08d0350c | 186 | EXPORT_SYMBOL(unregister_quota_format); |
1da177e4 LT |
187 | |
188 | static struct quota_format_type *find_quota_format(int id) | |
189 | { | |
190 | struct quota_format_type *actqf; | |
191 | ||
192 | spin_lock(&dq_list_lock); | |
268157ba JK |
193 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
194 | actqf = actqf->qf_next) | |
195 | ; | |
1da177e4 LT |
196 | if (!actqf || !try_module_get(actqf->qf_owner)) { |
197 | int qm; | |
198 | ||
199 | spin_unlock(&dq_list_lock); | |
27942ef5 | 200 | |
268157ba JK |
201 | for (qm = 0; module_names[qm].qm_fmt_id && |
202 | module_names[qm].qm_fmt_id != id; qm++) | |
203 | ; | |
204 | if (!module_names[qm].qm_fmt_id || | |
205 | request_module(module_names[qm].qm_mod_name)) | |
1da177e4 LT |
206 | return NULL; |
207 | ||
208 | spin_lock(&dq_list_lock); | |
268157ba JK |
209 | for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; |
210 | actqf = actqf->qf_next) | |
211 | ; | |
1da177e4 LT |
212 | if (actqf && !try_module_get(actqf->qf_owner)) |
213 | actqf = NULL; | |
214 | } | |
215 | spin_unlock(&dq_list_lock); | |
216 | return actqf; | |
217 | } | |
218 | ||
219 | static void put_quota_format(struct quota_format_type *fmt) | |
220 | { | |
221 | module_put(fmt->qf_owner); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Dquot List Management: | |
f44840ad CX |
226 | * The quota code uses four lists for dquot management: the inuse_list, |
227 | * free_dquots, dqi_dirty_list, and dquot_hash[] array. A single dquot | |
228 | * structure may be on some of those lists, depending on its current state. | |
1da177e4 LT |
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 | * | |
f44840ad CX |
239 | * Dirty dquots are added to the dqi_dirty_list of quota_info when mark |
240 | * dirtied, and this list is searched when writing dirty dquots back to | |
241 | * quota file. Note that some filesystems do dirty dquot tracking on their | |
242 | * own (e.g. in a journal) and thus don't use dqi_dirty_list. | |
243 | * | |
1da177e4 LT |
244 | * Dquots with a specific identity (device, type and id) are placed on |
245 | * one of the dquot_hash[] hash chains. The provides an efficient search | |
246 | * mechanism to locate a specific dquot. | |
247 | */ | |
248 | ||
249 | static LIST_HEAD(inuse_list); | |
250 | static LIST_HEAD(free_dquots); | |
251 | static unsigned int dq_hash_bits, dq_hash_mask; | |
252 | static struct hlist_head *dquot_hash; | |
253 | ||
254 | struct dqstats dqstats; | |
08d0350c | 255 | EXPORT_SYMBOL(dqstats); |
1da177e4 | 256 | |
0a5a9c72 | 257 | static qsize_t inode_get_rsv_space(struct inode *inode); |
7b9ca4c6 | 258 | static qsize_t __inode_get_rsv_space(struct inode *inode); |
6184fc0b | 259 | static int __dquot_initialize(struct inode *inode, int type); |
0a5a9c72 | 260 | |
1da177e4 | 261 | static inline unsigned int |
1a06d420 | 262 | hashfn(const struct super_block *sb, struct kqid qid) |
1da177e4 | 263 | { |
1a06d420 EB |
264 | unsigned int id = from_kqid(&init_user_ns, qid); |
265 | int type = qid.type; | |
1da177e4 LT |
266 | unsigned long tmp; |
267 | ||
268 | tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); | |
269 | return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Following list functions expect dq_list_lock to be held | |
274 | */ | |
275 | static inline void insert_dquot_hash(struct dquot *dquot) | |
276 | { | |
268157ba | 277 | struct hlist_head *head; |
1a06d420 | 278 | head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); |
1da177e4 LT |
279 | hlist_add_head(&dquot->dq_hash, head); |
280 | } | |
281 | ||
282 | static inline void remove_dquot_hash(struct dquot *dquot) | |
283 | { | |
284 | hlist_del_init(&dquot->dq_hash); | |
285 | } | |
286 | ||
7a2435d8 | 287 | static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, |
1a06d420 | 288 | struct kqid qid) |
1da177e4 LT |
289 | { |
290 | struct hlist_node *node; | |
291 | struct dquot *dquot; | |
292 | ||
293 | hlist_for_each (node, dquot_hash+hashent) { | |
294 | dquot = hlist_entry(node, struct dquot, dq_hash); | |
4c376dca | 295 | if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) |
1da177e4 LT |
296 | return dquot; |
297 | } | |
dd6f3c6d | 298 | return NULL; |
1da177e4 LT |
299 | } |
300 | ||
301 | /* Add a dquot to the tail of the free list */ | |
302 | static inline void put_dquot_last(struct dquot *dquot) | |
303 | { | |
8e13059a | 304 | list_add_tail(&dquot->dq_free, &free_dquots); |
dde95888 | 305 | dqstats_inc(DQST_FREE_DQUOTS); |
1da177e4 LT |
306 | } |
307 | ||
308 | static inline void remove_free_dquot(struct dquot *dquot) | |
309 | { | |
310 | if (list_empty(&dquot->dq_free)) | |
311 | return; | |
312 | list_del_init(&dquot->dq_free); | |
dde95888 | 313 | dqstats_dec(DQST_FREE_DQUOTS); |
1da177e4 LT |
314 | } |
315 | ||
316 | static inline void put_inuse(struct dquot *dquot) | |
317 | { | |
318 | /* We add to the back of inuse list so we don't have to restart | |
319 | * when traversing this list and we block */ | |
8e13059a | 320 | list_add_tail(&dquot->dq_inuse, &inuse_list); |
dde95888 | 321 | dqstats_inc(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
322 | } |
323 | ||
324 | static inline void remove_inuse(struct dquot *dquot) | |
325 | { | |
dde95888 | 326 | dqstats_dec(DQST_ALLOC_DQUOTS); |
1da177e4 LT |
327 | list_del(&dquot->dq_inuse); |
328 | } | |
329 | /* | |
330 | * End of list functions needing dq_list_lock | |
331 | */ | |
332 | ||
333 | static void wait_on_dquot(struct dquot *dquot) | |
334 | { | |
d3be915f IM |
335 | mutex_lock(&dquot->dq_lock); |
336 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
337 | } |
338 | ||
03f6e92b JK |
339 | static inline int dquot_dirty(struct dquot *dquot) |
340 | { | |
341 | return test_bit(DQ_MOD_B, &dquot->dq_flags); | |
342 | } | |
343 | ||
344 | static inline int mark_dquot_dirty(struct dquot *dquot) | |
345 | { | |
346 | return dquot->dq_sb->dq_op->mark_dirty(dquot); | |
347 | } | |
1da177e4 | 348 | |
eabf290d | 349 | /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ |
1da177e4 LT |
350 | int dquot_mark_dquot_dirty(struct dquot *dquot) |
351 | { | |
eabf290d DM |
352 | int ret = 1; |
353 | ||
4580b30e JK |
354 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
355 | return 0; | |
356 | ||
834057bf JK |
357 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
358 | return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); | |
359 | ||
eabf290d DM |
360 | /* If quota is dirty already, we don't have to acquire dq_list_lock */ |
361 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) | |
362 | return 1; | |
363 | ||
1da177e4 | 364 | spin_lock(&dq_list_lock); |
eabf290d | 365 | if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { |
1da177e4 | 366 | list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> |
4c376dca | 367 | info[dquot->dq_id.type].dqi_dirty_list); |
eabf290d DM |
368 | ret = 0; |
369 | } | |
1da177e4 | 370 | spin_unlock(&dq_list_lock); |
eabf290d | 371 | return ret; |
1da177e4 | 372 | } |
08d0350c | 373 | EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
1da177e4 | 374 | |
dc52dd3a DM |
375 | /* Dirtify all the dquots - this can block when journalling */ |
376 | static inline int mark_all_dquot_dirty(struct dquot * const *dquot) | |
377 | { | |
378 | int ret, err, cnt; | |
379 | ||
380 | ret = err = 0; | |
381 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
382 | if (dquot[cnt]) | |
383 | /* Even in case of error we have to continue */ | |
384 | ret = mark_dquot_dirty(dquot[cnt]); | |
385 | if (!err) | |
386 | err = ret; | |
387 | } | |
388 | return err; | |
389 | } | |
390 | ||
391 | static inline void dqput_all(struct dquot **dquot) | |
392 | { | |
393 | unsigned int cnt; | |
394 | ||
395 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
396 | dqput(dquot[cnt]); | |
397 | } | |
398 | ||
1da177e4 LT |
399 | static inline int clear_dquot_dirty(struct dquot *dquot) |
400 | { | |
834057bf JK |
401 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) |
402 | return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); | |
403 | ||
1e0b7cb0 JK |
404 | spin_lock(&dq_list_lock); |
405 | if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { | |
406 | spin_unlock(&dq_list_lock); | |
1da177e4 | 407 | return 0; |
1e0b7cb0 | 408 | } |
1da177e4 | 409 | list_del_init(&dquot->dq_dirty); |
1e0b7cb0 | 410 | spin_unlock(&dq_list_lock); |
1da177e4 LT |
411 | return 1; |
412 | } | |
413 | ||
414 | void mark_info_dirty(struct super_block *sb, int type) | |
415 | { | |
15512377 JK |
416 | spin_lock(&dq_data_lock); |
417 | sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; | |
418 | spin_unlock(&dq_data_lock); | |
1da177e4 LT |
419 | } |
420 | EXPORT_SYMBOL(mark_info_dirty); | |
421 | ||
422 | /* | |
423 | * Read dquot from disk and alloc space for it | |
424 | */ | |
425 | ||
426 | int dquot_acquire(struct dquot *dquot) | |
427 | { | |
428 | int ret = 0, ret2 = 0; | |
429 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
430 | ||
d3be915f | 431 | mutex_lock(&dquot->dq_lock); |
3ef177ec | 432 | if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { |
4c376dca | 433 | ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); |
3ef177ec CX |
434 | if (ret < 0) |
435 | goto out_iolock; | |
436 | } | |
044c9b67 JK |
437 | /* Make sure flags update is visible after dquot has been filled */ |
438 | smp_mb__before_atomic(); | |
1da177e4 LT |
439 | set_bit(DQ_READ_B, &dquot->dq_flags); |
440 | /* Instantiate dquot if needed */ | |
441 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { | |
4c376dca | 442 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
1da177e4 | 443 | /* Write the info if needed */ |
4c376dca EB |
444 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
445 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
446 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 447 | } |
1da177e4 LT |
448 | if (ret < 0) |
449 | goto out_iolock; | |
450 | if (ret2 < 0) { | |
451 | ret = ret2; | |
452 | goto out_iolock; | |
453 | } | |
454 | } | |
044c9b67 JK |
455 | /* |
456 | * Make sure flags update is visible after on-disk struct has been | |
457 | * allocated. Paired with smp_rmb() in dqget(). | |
458 | */ | |
459 | smp_mb__before_atomic(); | |
1da177e4 LT |
460 | set_bit(DQ_ACTIVE_B, &dquot->dq_flags); |
461 | out_iolock: | |
d3be915f | 462 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
463 | return ret; |
464 | } | |
08d0350c | 465 | EXPORT_SYMBOL(dquot_acquire); |
1da177e4 LT |
466 | |
467 | /* | |
468 | * Write dquot to disk | |
469 | */ | |
470 | int dquot_commit(struct dquot *dquot) | |
471 | { | |
b03f2456 | 472 | int ret = 0; |
1da177e4 LT |
473 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
474 | ||
5e8cb9b6 | 475 | mutex_lock(&dquot->dq_lock); |
1e0b7cb0 | 476 | if (!clear_dquot_dirty(dquot)) |
5e8cb9b6 | 477 | goto out_lock; |
1da177e4 LT |
478 | /* Inactive dquot can be only if there was error during read/init |
479 | * => we have better not writing it */ | |
b03f2456 | 480 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) |
4c376dca | 481 | ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); |
b03f2456 JK |
482 | else |
483 | ret = -EIO; | |
5e8cb9b6 JK |
484 | out_lock: |
485 | mutex_unlock(&dquot->dq_lock); | |
1da177e4 LT |
486 | return ret; |
487 | } | |
08d0350c | 488 | EXPORT_SYMBOL(dquot_commit); |
1da177e4 LT |
489 | |
490 | /* | |
491 | * Release dquot | |
492 | */ | |
493 | int dquot_release(struct dquot *dquot) | |
494 | { | |
495 | int ret = 0, ret2 = 0; | |
496 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); | |
497 | ||
d3be915f | 498 | mutex_lock(&dquot->dq_lock); |
1da177e4 LT |
499 | /* Check whether we are not racing with some other dqget() */ |
500 | if (atomic_read(&dquot->dq_count) > 1) | |
501 | goto out_dqlock; | |
4c376dca EB |
502 | if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { |
503 | ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); | |
1da177e4 | 504 | /* Write the info */ |
4c376dca EB |
505 | if (info_dirty(&dqopt->info[dquot->dq_id.type])) { |
506 | ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( | |
507 | dquot->dq_sb, dquot->dq_id.type); | |
268157ba | 508 | } |
1da177e4 LT |
509 | if (ret >= 0) |
510 | ret = ret2; | |
511 | } | |
512 | clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); | |
1da177e4 | 513 | out_dqlock: |
d3be915f | 514 | mutex_unlock(&dquot->dq_lock); |
1da177e4 LT |
515 | return ret; |
516 | } | |
08d0350c | 517 | EXPORT_SYMBOL(dquot_release); |
1da177e4 | 518 | |
7d9056ba | 519 | void dquot_destroy(struct dquot *dquot) |
74f783af JK |
520 | { |
521 | kmem_cache_free(dquot_cachep, dquot); | |
522 | } | |
7d9056ba | 523 | EXPORT_SYMBOL(dquot_destroy); |
74f783af JK |
524 | |
525 | static inline void do_destroy_dquot(struct dquot *dquot) | |
526 | { | |
527 | dquot->dq_sb->dq_op->destroy_dquot(dquot); | |
528 | } | |
529 | ||
1da177e4 LT |
530 | /* Invalidate all dquots on the list. Note that this function is called after |
531 | * quota is disabled and pointers from inodes removed so there cannot be new | |
6362e4d4 JK |
532 | * quota users. There can still be some users of quotas due to inodes being |
533 | * just deleted or pruned by prune_icache() (those are not attached to any | |
cc33412f | 534 | * list) or parallel quotactl call. We have to wait for such users. |
6362e4d4 | 535 | */ |
1da177e4 LT |
536 | static void invalidate_dquots(struct super_block *sb, int type) |
537 | { | |
c33ed271 | 538 | struct dquot *dquot, *tmp; |
1da177e4 | 539 | |
6362e4d4 | 540 | restart: |
1da177e4 | 541 | spin_lock(&dq_list_lock); |
c33ed271 | 542 | list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { |
1da177e4 LT |
543 | if (dquot->dq_sb != sb) |
544 | continue; | |
4c376dca | 545 | if (dquot->dq_id.type != type) |
1da177e4 | 546 | continue; |
6362e4d4 JK |
547 | /* Wait for dquot users */ |
548 | if (atomic_read(&dquot->dq_count)) { | |
9f985cb6 | 549 | dqgrab(dquot); |
6362e4d4 | 550 | spin_unlock(&dq_list_lock); |
503330f3 JK |
551 | /* |
552 | * Once dqput() wakes us up, we know it's time to free | |
6362e4d4 JK |
553 | * the dquot. |
554 | * IMPORTANT: we rely on the fact that there is always | |
555 | * at most one process waiting for dquot to free. | |
556 | * Otherwise dq_count would be > 1 and we would never | |
557 | * wake up. | |
558 | */ | |
503330f3 JK |
559 | wait_event(dquot_ref_wq, |
560 | atomic_read(&dquot->dq_count) == 1); | |
6362e4d4 JK |
561 | dqput(dquot); |
562 | /* At this moment dquot() need not exist (it could be | |
563 | * reclaimed by prune_dqcache(). Hence we must | |
564 | * restart. */ | |
565 | goto restart; | |
566 | } | |
567 | /* | |
568 | * Quota now has no users and it has been written on last | |
569 | * dqput() | |
570 | */ | |
1da177e4 LT |
571 | remove_dquot_hash(dquot); |
572 | remove_free_dquot(dquot); | |
573 | remove_inuse(dquot); | |
74f783af | 574 | do_destroy_dquot(dquot); |
1da177e4 LT |
575 | } |
576 | spin_unlock(&dq_list_lock); | |
577 | } | |
578 | ||
12c77527 JK |
579 | /* Call callback for every active dquot on given filesystem */ |
580 | int dquot_scan_active(struct super_block *sb, | |
581 | int (*fn)(struct dquot *dquot, unsigned long priv), | |
582 | unsigned long priv) | |
583 | { | |
584 | struct dquot *dquot, *old_dquot = NULL; | |
585 | int ret = 0; | |
586 | ||
ee1ac541 JK |
587 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
588 | ||
12c77527 JK |
589 | spin_lock(&dq_list_lock); |
590 | list_for_each_entry(dquot, &inuse_list, dq_inuse) { | |
591 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) | |
592 | continue; | |
593 | if (dquot->dq_sb != sb) | |
594 | continue; | |
595 | /* Now we have active dquot so we can just increase use count */ | |
596 | atomic_inc(&dquot->dq_count); | |
12c77527 | 597 | spin_unlock(&dq_list_lock); |
dde95888 | 598 | dqstats_inc(DQST_LOOKUPS); |
12c77527 JK |
599 | dqput(old_dquot); |
600 | old_dquot = dquot; | |
1362f4ea JK |
601 | /* |
602 | * ->release_dquot() can be racing with us. Our reference | |
603 | * protects us from new calls to it so just wait for any | |
604 | * outstanding call and recheck the DQ_ACTIVE_B after that. | |
605 | */ | |
606 | wait_on_dquot(dquot); | |
607 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { | |
608 | ret = fn(dquot, priv); | |
609 | if (ret < 0) | |
610 | goto out; | |
611 | } | |
12c77527 JK |
612 | spin_lock(&dq_list_lock); |
613 | /* We are safe to continue now because our dquot could not | |
614 | * be moved out of the inuse list while we hold the reference */ | |
615 | } | |
616 | spin_unlock(&dq_list_lock); | |
617 | out: | |
618 | dqput(old_dquot); | |
12c77527 JK |
619 | return ret; |
620 | } | |
08d0350c | 621 | EXPORT_SYMBOL(dquot_scan_active); |
12c77527 | 622 | |
ceed1723 JK |
623 | /* Write all dquot structures to quota files */ |
624 | int dquot_writeback_dquots(struct super_block *sb, int type) | |
1da177e4 LT |
625 | { |
626 | struct list_head *dirty; | |
627 | struct dquot *dquot; | |
628 | struct quota_info *dqopt = sb_dqopt(sb); | |
629 | int cnt; | |
ceed1723 | 630 | int err, ret = 0; |
1da177e4 | 631 | |
9d1ccbe7 JK |
632 | WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); |
633 | ||
1da177e4 LT |
634 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
635 | if (type != -1 && cnt != type) | |
636 | continue; | |
f55abc0f | 637 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 LT |
638 | continue; |
639 | spin_lock(&dq_list_lock); | |
640 | dirty = &dqopt->info[cnt].dqi_dirty_list; | |
641 | while (!list_empty(dirty)) { | |
268157ba JK |
642 | dquot = list_first_entry(dirty, struct dquot, |
643 | dq_dirty); | |
4580b30e JK |
644 | |
645 | WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); | |
646 | ||
1da177e4 LT |
647 | /* Now we have active dquot from which someone is |
648 | * holding reference so we can safely just increase | |
649 | * use count */ | |
9f985cb6 | 650 | dqgrab(dquot); |
1da177e4 | 651 | spin_unlock(&dq_list_lock); |
dde95888 | 652 | dqstats_inc(DQST_LOOKUPS); |
ceed1723 | 653 | err = sb->dq_op->write_dquot(dquot); |
dd5f6279 | 654 | if (err) { |
655 | /* | |
656 | * Clear dirty bit anyway to avoid infinite | |
657 | * loop here. | |
658 | */ | |
659 | clear_dquot_dirty(dquot); | |
660 | if (!ret) | |
661 | ret = err; | |
662 | } | |
1da177e4 LT |
663 | dqput(dquot); |
664 | spin_lock(&dq_list_lock); | |
665 | } | |
666 | spin_unlock(&dq_list_lock); | |
667 | } | |
668 | ||
669 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
f55abc0f JK |
670 | if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) |
671 | && info_dirty(&dqopt->info[cnt])) | |
1da177e4 | 672 | sb->dq_op->write_info(sb, cnt); |
dde95888 | 673 | dqstats_inc(DQST_SYNCS); |
1da177e4 | 674 | |
ceed1723 JK |
675 | return ret; |
676 | } | |
677 | EXPORT_SYMBOL(dquot_writeback_dquots); | |
678 | ||
679 | /* Write all dquot structures to disk and make them visible from userspace */ | |
680 | int dquot_quota_sync(struct super_block *sb, int type) | |
681 | { | |
682 | struct quota_info *dqopt = sb_dqopt(sb); | |
683 | int cnt; | |
684 | int ret; | |
685 | ||
686 | ret = dquot_writeback_dquots(sb, type); | |
687 | if (ret) | |
688 | return ret; | |
689 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
5fb324ad CH |
690 | return 0; |
691 | ||
692 | /* This is not very clever (and fast) but currently I don't know about | |
693 | * any other simple way of getting quota data to disk and we must get | |
694 | * them there for userspace to be visible... */ | |
695 | if (sb->s_op->sync_fs) | |
696 | sb->s_op->sync_fs(sb, 1); | |
697 | sync_blockdev(sb->s_bdev); | |
698 | ||
699 | /* | |
700 | * Now when everything is written we can discard the pagecache so | |
701 | * that userspace sees the changes. | |
702 | */ | |
5fb324ad CH |
703 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
704 | if (type != -1 && cnt != type) | |
705 | continue; | |
706 | if (!sb_has_quota_active(sb, cnt)) | |
707 | continue; | |
5955102c | 708 | inode_lock(dqopt->files[cnt]); |
f9ef1784 | 709 | truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); |
5955102c | 710 | inode_unlock(dqopt->files[cnt]); |
5fb324ad | 711 | } |
5fb324ad | 712 | |
1da177e4 LT |
713 | return 0; |
714 | } | |
287a8095 | 715 | EXPORT_SYMBOL(dquot_quota_sync); |
1da177e4 | 716 | |
1ab6c499 DC |
717 | static unsigned long |
718 | dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 719 | { |
1da177e4 | 720 | struct dquot *dquot; |
1ab6c499 | 721 | unsigned long freed = 0; |
1da177e4 | 722 | |
d68aab6b | 723 | spin_lock(&dq_list_lock); |
1822193b JK |
724 | while (!list_empty(&free_dquots) && sc->nr_to_scan) { |
725 | dquot = list_first_entry(&free_dquots, struct dquot, dq_free); | |
1da177e4 LT |
726 | remove_dquot_hash(dquot); |
727 | remove_free_dquot(dquot); | |
728 | remove_inuse(dquot); | |
74f783af | 729 | do_destroy_dquot(dquot); |
1ab6c499 DC |
730 | sc->nr_to_scan--; |
731 | freed++; | |
1da177e4 | 732 | } |
d68aab6b | 733 | spin_unlock(&dq_list_lock); |
1ab6c499 | 734 | return freed; |
1da177e4 LT |
735 | } |
736 | ||
1ab6c499 DC |
737 | static unsigned long |
738 | dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) | |
1da177e4 | 739 | { |
55f841ce GC |
740 | return vfs_pressure_ratio( |
741 | percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); | |
1da177e4 LT |
742 | } |
743 | ||
8e1f936b | 744 | static struct shrinker dqcache_shrinker = { |
1ab6c499 DC |
745 | .count_objects = dqcache_shrink_count, |
746 | .scan_objects = dqcache_shrink_scan, | |
8e1f936b RR |
747 | .seeks = DEFAULT_SEEKS, |
748 | }; | |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Put reference to dquot | |
1da177e4 | 752 | */ |
3d9ea253 | 753 | void dqput(struct dquot *dquot) |
1da177e4 | 754 | { |
b48d3805 JK |
755 | int ret; |
756 | ||
1da177e4 LT |
757 | if (!dquot) |
758 | return; | |
62af9b52 | 759 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 760 | if (!atomic_read(&dquot->dq_count)) { |
fb5ffb0e | 761 | quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", |
4c376dca EB |
762 | quotatypes[dquot->dq_id.type], |
763 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1da177e4 LT |
764 | BUG(); |
765 | } | |
766 | #endif | |
dde95888 | 767 | dqstats_inc(DQST_DROPS); |
1da177e4 LT |
768 | we_slept: |
769 | spin_lock(&dq_list_lock); | |
770 | if (atomic_read(&dquot->dq_count) > 1) { | |
771 | /* We have more than one user... nothing to do */ | |
772 | atomic_dec(&dquot->dq_count); | |
6362e4d4 | 773 | /* Releasing dquot during quotaoff phase? */ |
4c376dca | 774 | if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && |
6362e4d4 | 775 | atomic_read(&dquot->dq_count) == 1) |
503330f3 | 776 | wake_up(&dquot_ref_wq); |
1da177e4 LT |
777 | spin_unlock(&dq_list_lock); |
778 | return; | |
779 | } | |
780 | /* Need to release dquot? */ | |
4580b30e | 781 | if (dquot_dirty(dquot)) { |
1da177e4 LT |
782 | spin_unlock(&dq_list_lock); |
783 | /* Commit dquot before releasing */ | |
b48d3805 JK |
784 | ret = dquot->dq_sb->dq_op->write_dquot(dquot); |
785 | if (ret < 0) { | |
fb5ffb0e JZ |
786 | quota_error(dquot->dq_sb, "Can't write quota structure" |
787 | " (error %d). Quota may get out of sync!", | |
788 | ret); | |
b48d3805 JK |
789 | /* |
790 | * We clear dirty bit anyway, so that we avoid | |
791 | * infinite loop here | |
792 | */ | |
b48d3805 | 793 | clear_dquot_dirty(dquot); |
b48d3805 | 794 | } |
1da177e4 LT |
795 | goto we_slept; |
796 | } | |
1da177e4 LT |
797 | if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
798 | spin_unlock(&dq_list_lock); | |
799 | dquot->dq_sb->dq_op->release_dquot(dquot); | |
800 | goto we_slept; | |
801 | } | |
802 | atomic_dec(&dquot->dq_count); | |
62af9b52 | 803 | #ifdef CONFIG_QUOTA_DEBUG |
1da177e4 | 804 | /* sanity check */ |
8abf6a47 | 805 | BUG_ON(!list_empty(&dquot->dq_free)); |
1da177e4 LT |
806 | #endif |
807 | put_dquot_last(dquot); | |
808 | spin_unlock(&dq_list_lock); | |
809 | } | |
08d0350c | 810 | EXPORT_SYMBOL(dqput); |
1da177e4 | 811 | |
7d9056ba | 812 | struct dquot *dquot_alloc(struct super_block *sb, int type) |
74f783af JK |
813 | { |
814 | return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); | |
815 | } | |
7d9056ba | 816 | EXPORT_SYMBOL(dquot_alloc); |
74f783af | 817 | |
1da177e4 LT |
818 | static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
819 | { | |
820 | struct dquot *dquot; | |
821 | ||
74f783af | 822 | dquot = sb->dq_op->alloc_dquot(sb, type); |
1da177e4 | 823 | if(!dquot) |
dd6f3c6d | 824 | return NULL; |
1da177e4 | 825 | |
d3be915f | 826 | mutex_init(&dquot->dq_lock); |
1da177e4 LT |
827 | INIT_LIST_HEAD(&dquot->dq_free); |
828 | INIT_LIST_HEAD(&dquot->dq_inuse); | |
829 | INIT_HLIST_NODE(&dquot->dq_hash); | |
830 | INIT_LIST_HEAD(&dquot->dq_dirty); | |
831 | dquot->dq_sb = sb; | |
1a06d420 | 832 | dquot->dq_id = make_kqid_invalid(type); |
1da177e4 | 833 | atomic_set(&dquot->dq_count, 1); |
7b9ca4c6 | 834 | spin_lock_init(&dquot->dq_dqb_lock); |
1da177e4 LT |
835 | |
836 | return dquot; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Get reference to dquot | |
cc33412f JK |
841 | * |
842 | * Locking is slightly tricky here. We are guarded from parallel quotaoff() | |
843 | * destroying our dquot by: | |
844 | * a) checking for quota flags under dq_list_lock and | |
845 | * b) getting a reference to dquot before we release dq_list_lock | |
1da177e4 | 846 | */ |
aca645a6 | 847 | struct dquot *dqget(struct super_block *sb, struct kqid qid) |
1da177e4 | 848 | { |
1a06d420 | 849 | unsigned int hashent = hashfn(sb, qid); |
6184fc0b | 850 | struct dquot *dquot, *empty = NULL; |
1da177e4 | 851 | |
d49d3762 EB |
852 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
853 | return ERR_PTR(-EINVAL); | |
854 | ||
1a06d420 | 855 | if (!sb_has_quota_active(sb, qid.type)) |
6184fc0b | 856 | return ERR_PTR(-ESRCH); |
1da177e4 LT |
857 | we_slept: |
858 | spin_lock(&dq_list_lock); | |
cc33412f | 859 | spin_lock(&dq_state_lock); |
1a06d420 | 860 | if (!sb_has_quota_active(sb, qid.type)) { |
cc33412f JK |
861 | spin_unlock(&dq_state_lock); |
862 | spin_unlock(&dq_list_lock); | |
6184fc0b | 863 | dquot = ERR_PTR(-ESRCH); |
cc33412f JK |
864 | goto out; |
865 | } | |
866 | spin_unlock(&dq_state_lock); | |
867 | ||
1a06d420 | 868 | dquot = find_dquot(hashent, sb, qid); |
dd6f3c6d JK |
869 | if (!dquot) { |
870 | if (!empty) { | |
1da177e4 | 871 | spin_unlock(&dq_list_lock); |
1a06d420 | 872 | empty = get_empty_dquot(sb, qid.type); |
dd6f3c6d | 873 | if (!empty) |
1da177e4 LT |
874 | schedule(); /* Try to wait for a moment... */ |
875 | goto we_slept; | |
876 | } | |
877 | dquot = empty; | |
dd6f3c6d | 878 | empty = NULL; |
4c376dca | 879 | dquot->dq_id = qid; |
1da177e4 LT |
880 | /* all dquots go on the inuse_list */ |
881 | put_inuse(dquot); | |
882 | /* hash it first so it can be found */ | |
883 | insert_dquot_hash(dquot); | |
1da177e4 | 884 | spin_unlock(&dq_list_lock); |
dde95888 | 885 | dqstats_inc(DQST_LOOKUPS); |
1da177e4 LT |
886 | } else { |
887 | if (!atomic_read(&dquot->dq_count)) | |
888 | remove_free_dquot(dquot); | |
889 | atomic_inc(&dquot->dq_count); | |
1da177e4 | 890 | spin_unlock(&dq_list_lock); |
dde95888 DM |
891 | dqstats_inc(DQST_CACHE_HITS); |
892 | dqstats_inc(DQST_LOOKUPS); | |
1da177e4 | 893 | } |
268157ba JK |
894 | /* Wait for dq_lock - after this we know that either dquot_release() is |
895 | * already finished or it will be canceled due to dq_count > 1 test */ | |
1da177e4 | 896 | wait_on_dquot(dquot); |
268157ba | 897 | /* Read the dquot / allocate space in quota file */ |
6184fc0b JK |
898 | if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { |
899 | int err; | |
900 | ||
901 | err = sb->dq_op->acquire_dquot(dquot); | |
902 | if (err < 0) { | |
903 | dqput(dquot); | |
904 | dquot = ERR_PTR(err); | |
905 | goto out; | |
906 | } | |
1da177e4 | 907 | } |
044c9b67 JK |
908 | /* |
909 | * Make sure following reads see filled structure - paired with | |
910 | * smp_mb__before_atomic() in dquot_acquire(). | |
911 | */ | |
912 | smp_rmb(); | |
62af9b52 | 913 | #ifdef CONFIG_QUOTA_DEBUG |
8abf6a47 | 914 | BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
1da177e4 | 915 | #endif |
cc33412f JK |
916 | out: |
917 | if (empty) | |
918 | do_destroy_dquot(empty); | |
1da177e4 LT |
919 | |
920 | return dquot; | |
921 | } | |
08d0350c | 922 | EXPORT_SYMBOL(dqget); |
1da177e4 | 923 | |
2d0fa467 JK |
924 | static inline struct dquot **i_dquot(struct inode *inode) |
925 | { | |
2d0fa467 JK |
926 | return inode->i_sb->s_op->get_dquots(inode); |
927 | } | |
928 | ||
1da177e4 LT |
929 | static int dqinit_needed(struct inode *inode, int type) |
930 | { | |
5bcd3b6f | 931 | struct dquot * const *dquots; |
1da177e4 LT |
932 | int cnt; |
933 | ||
934 | if (IS_NOQUOTA(inode)) | |
935 | return 0; | |
5bcd3b6f KK |
936 | |
937 | dquots = i_dquot(inode); | |
1da177e4 | 938 | if (type != -1) |
5bcd3b6f | 939 | return !dquots[type]; |
1da177e4 | 940 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
5bcd3b6f | 941 | if (!dquots[cnt]) |
1da177e4 LT |
942 | return 1; |
943 | return 0; | |
944 | } | |
945 | ||
c3b00446 | 946 | /* This routine is guarded by s_umount semaphore */ |
1a6152d3 | 947 | static int add_dquot_ref(struct super_block *sb, int type) |
1da177e4 | 948 | { |
941d2380 | 949 | struct inode *inode, *old_inode = NULL; |
62af9b52 | 950 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 951 | int reserved = 0; |
4c5e6c0e | 952 | #endif |
1a6152d3 | 953 | int err = 0; |
1da177e4 | 954 | |
74278da9 | 955 | spin_lock(&sb->s_inode_list_lock); |
d003fb70 | 956 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed DC |
957 | spin_lock(&inode->i_lock); |
958 | if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || | |
959 | !atomic_read(&inode->i_writecount) || | |
960 | !dqinit_needed(inode, type)) { | |
961 | spin_unlock(&inode->i_lock); | |
aabb8fdb | 962 | continue; |
250df6ed | 963 | } |
d003fb70 | 964 | __iget(inode); |
250df6ed | 965 | spin_unlock(&inode->i_lock); |
74278da9 | 966 | spin_unlock(&sb->s_inode_list_lock); |
d003fb70 | 967 | |
d7e97117 JK |
968 | #ifdef CONFIG_QUOTA_DEBUG |
969 | if (unlikely(inode_get_rsv_space(inode) > 0)) | |
970 | reserved = 1; | |
971 | #endif | |
941d2380 | 972 | iput(old_inode); |
1a6152d3 CY |
973 | err = __dquot_initialize(inode, type); |
974 | if (err) { | |
975 | iput(inode); | |
976 | goto out; | |
977 | } | |
55fa6091 DC |
978 | |
979 | /* | |
980 | * We hold a reference to 'inode' so it couldn't have been | |
981 | * removed from s_inodes list while we dropped the | |
74278da9 | 982 | * s_inode_list_lock. We cannot iput the inode now as we can be |
55fa6091 | 983 | * holding the last reference and we cannot iput it under |
74278da9 | 984 | * s_inode_list_lock. So we keep the reference and iput it |
55fa6091 DC |
985 | * later. |
986 | */ | |
941d2380 | 987 | old_inode = inode; |
74278da9 | 988 | spin_lock(&sb->s_inode_list_lock); |
1da177e4 | 989 | } |
74278da9 | 990 | spin_unlock(&sb->s_inode_list_lock); |
941d2380 | 991 | iput(old_inode); |
1a6152d3 | 992 | out: |
62af9b52 | 993 | #ifdef CONFIG_QUOTA_DEBUG |
0a5a9c72 | 994 | if (reserved) { |
fb5ffb0e JZ |
995 | quota_error(sb, "Writes happened before quota was turned on " |
996 | "thus quota information is probably inconsistent. " | |
997 | "Please run quotacheck(8)"); | |
0a5a9c72 | 998 | } |
4c5e6c0e | 999 | #endif |
1a6152d3 | 1000 | return err; |
1da177e4 LT |
1001 | } |
1002 | ||
268157ba JK |
1003 | /* |
1004 | * Remove references to dquots from inode and add dquot to list for freeing | |
25985edc | 1005 | * if we have the last reference to dquot |
268157ba | 1006 | */ |
9eb6463f NY |
1007 | static void remove_inode_dquot_ref(struct inode *inode, int type, |
1008 | struct list_head *tofree_head) | |
1da177e4 | 1009 | { |
5bcd3b6f KK |
1010 | struct dquot **dquots = i_dquot(inode); |
1011 | struct dquot *dquot = dquots[type]; | |
1da177e4 | 1012 | |
9eb6463f NY |
1013 | if (!dquot) |
1014 | return; | |
1015 | ||
5bcd3b6f | 1016 | dquots[type] = NULL; |
9eb6463f NY |
1017 | if (list_empty(&dquot->dq_free)) { |
1018 | /* | |
1019 | * The inode still has reference to dquot so it can't be in the | |
1020 | * free list | |
1021 | */ | |
1022 | spin_lock(&dq_list_lock); | |
1023 | list_add(&dquot->dq_free, tofree_head); | |
1024 | spin_unlock(&dq_list_lock); | |
1025 | } else { | |
1026 | /* | |
1027 | * Dquot is already in a list to put so we won't drop the last | |
1028 | * reference here. | |
1029 | */ | |
1030 | dqput(dquot); | |
1da177e4 | 1031 | } |
1da177e4 LT |
1032 | } |
1033 | ||
268157ba JK |
1034 | /* |
1035 | * Free list of dquots | |
1036 | * Dquots are removed from inodes and no new references can be got so we are | |
1037 | * the only ones holding reference | |
1038 | */ | |
1da177e4 LT |
1039 | static void put_dquot_list(struct list_head *tofree_head) |
1040 | { | |
1041 | struct list_head *act_head; | |
1042 | struct dquot *dquot; | |
1043 | ||
1044 | act_head = tofree_head->next; | |
1da177e4 LT |
1045 | while (act_head != tofree_head) { |
1046 | dquot = list_entry(act_head, struct dquot, dq_free); | |
1047 | act_head = act_head->next; | |
268157ba JK |
1048 | /* Remove dquot from the list so we won't have problems... */ |
1049 | list_del_init(&dquot->dq_free); | |
1da177e4 LT |
1050 | dqput(dquot); |
1051 | } | |
1052 | } | |
1053 | ||
fb58b731 CH |
1054 | static void remove_dquot_ref(struct super_block *sb, int type, |
1055 | struct list_head *tofree_head) | |
1056 | { | |
1057 | struct inode *inode; | |
78bc3334 | 1058 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 | 1059 | int reserved = 0; |
78bc3334 | 1060 | #endif |
fb58b731 | 1061 | |
74278da9 | 1062 | spin_lock(&sb->s_inode_list_lock); |
fb58b731 | 1063 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
aabb8fdb NP |
1064 | /* |
1065 | * We have to scan also I_NEW inodes because they can already | |
1066 | * have quota pointer initialized. Luckily, we need to touch | |
1067 | * only quota pointers and these have separate locking | |
b9ba6f94 | 1068 | * (dq_data_lock). |
aabb8fdb | 1069 | */ |
b9ba6f94 | 1070 | spin_lock(&dq_data_lock); |
7af9cce8 | 1071 | if (!IS_NOQUOTA(inode)) { |
78bc3334 | 1072 | #ifdef CONFIG_QUOTA_DEBUG |
7af9cce8 DM |
1073 | if (unlikely(inode_get_rsv_space(inode) > 0)) |
1074 | reserved = 1; | |
78bc3334 | 1075 | #endif |
fb58b731 | 1076 | remove_inode_dquot_ref(inode, type, tofree_head); |
7af9cce8 | 1077 | } |
b9ba6f94 | 1078 | spin_unlock(&dq_data_lock); |
fb58b731 | 1079 | } |
74278da9 | 1080 | spin_unlock(&sb->s_inode_list_lock); |
7af9cce8 DM |
1081 | #ifdef CONFIG_QUOTA_DEBUG |
1082 | if (reserved) { | |
1083 | printk(KERN_WARNING "VFS (%s): Writes happened after quota" | |
1084 | " was disabled thus quota information is probably " | |
1085 | "inconsistent. Please run quotacheck(8).\n", sb->s_id); | |
1086 | } | |
1087 | #endif | |
fb58b731 CH |
1088 | } |
1089 | ||
1da177e4 LT |
1090 | /* Gather all references from inodes and drop them */ |
1091 | static void drop_dquot_ref(struct super_block *sb, int type) | |
1092 | { | |
1093 | LIST_HEAD(tofree_head); | |
1094 | ||
fb58b731 | 1095 | if (sb->dq_op) { |
fb58b731 | 1096 | remove_dquot_ref(sb, type, &tofree_head); |
b9ba6f94 | 1097 | synchronize_srcu(&dquot_srcu); |
fb58b731 CH |
1098 | put_dquot_list(&tofree_head); |
1099 | } | |
1da177e4 LT |
1100 | } |
1101 | ||
740d9dcd MC |
1102 | static inline |
1103 | void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) | |
1104 | { | |
0a5a9c72 JK |
1105 | if (dquot->dq_dqb.dqb_rsvspace >= number) |
1106 | dquot->dq_dqb.dqb_rsvspace -= number; | |
1107 | else { | |
1108 | WARN_ON_ONCE(1); | |
1109 | dquot->dq_dqb.dqb_rsvspace = 0; | |
1110 | } | |
41e327b5 | 1111 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1112 | dquot->dq_dqb.dqb_bsoftlimit) | |
1113 | dquot->dq_dqb.dqb_btime = (time64_t) 0; | |
1114 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
740d9dcd MC |
1115 | } |
1116 | ||
7a2435d8 | 1117 | static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) |
1da177e4 | 1118 | { |
db49d2df JK |
1119 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1120 | dquot->dq_dqb.dqb_curinodes >= number) | |
1da177e4 LT |
1121 | dquot->dq_dqb.dqb_curinodes -= number; |
1122 | else | |
1123 | dquot->dq_dqb.dqb_curinodes = 0; | |
1124 | if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
e008bb61 | 1125 | dquot->dq_dqb.dqb_itime = (time64_t) 0; |
1da177e4 LT |
1126 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
1127 | } | |
1128 | ||
7a2435d8 | 1129 | static void dquot_decr_space(struct dquot *dquot, qsize_t number) |
1da177e4 | 1130 | { |
db49d2df JK |
1131 | if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || |
1132 | dquot->dq_dqb.dqb_curspace >= number) | |
1da177e4 LT |
1133 | dquot->dq_dqb.dqb_curspace -= number; |
1134 | else | |
1135 | dquot->dq_dqb.dqb_curspace = 0; | |
41e327b5 | 1136 | if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= |
1137 | dquot->dq_dqb.dqb_bsoftlimit) | |
e008bb61 | 1138 | dquot->dq_dqb.dqb_btime = (time64_t) 0; |
1da177e4 LT |
1139 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
1140 | } | |
1141 | ||
bf097aaf JK |
1142 | struct dquot_warn { |
1143 | struct super_block *w_sb; | |
7b9c7321 | 1144 | struct kqid w_dq_id; |
bf097aaf JK |
1145 | short w_type; |
1146 | }; | |
1147 | ||
c525460e JK |
1148 | static int warning_issued(struct dquot *dquot, const int warntype) |
1149 | { | |
1150 | int flag = (warntype == QUOTA_NL_BHARDWARN || | |
1151 | warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : | |
1152 | ((warntype == QUOTA_NL_IHARDWARN || | |
1153 | warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); | |
1154 | ||
1155 | if (!flag) | |
1156 | return 0; | |
1157 | return test_and_set_bit(flag, &dquot->dq_flags); | |
1158 | } | |
1159 | ||
8e893469 | 1160 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 LT |
1161 | static int flag_print_warnings = 1; |
1162 | ||
bf097aaf | 1163 | static int need_print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1164 | { |
1165 | if (!flag_print_warnings) | |
1166 | return 0; | |
1167 | ||
7b9c7321 | 1168 | switch (warn->w_dq_id.type) { |
1da177e4 | 1169 | case USRQUOTA: |
1a06d420 | 1170 | return uid_eq(current_fsuid(), warn->w_dq_id.uid); |
1da177e4 | 1171 | case GRPQUOTA: |
7b9c7321 | 1172 | return in_group_p(warn->w_dq_id.gid); |
847aac64 LX |
1173 | case PRJQUOTA: |
1174 | return 1; | |
1da177e4 LT |
1175 | } |
1176 | return 0; | |
1177 | } | |
1178 | ||
1da177e4 | 1179 | /* Print warning to user which exceeded quota */ |
bf097aaf | 1180 | static void print_warning(struct dquot_warn *warn) |
1da177e4 LT |
1181 | { |
1182 | char *msg = NULL; | |
24ec839c | 1183 | struct tty_struct *tty; |
bf097aaf | 1184 | int warntype = warn->w_type; |
1da177e4 | 1185 | |
657d3bfa JK |
1186 | if (warntype == QUOTA_NL_IHARDBELOW || |
1187 | warntype == QUOTA_NL_ISOFTBELOW || | |
1188 | warntype == QUOTA_NL_BHARDBELOW || | |
bf097aaf | 1189 | warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) |
1da177e4 LT |
1190 | return; |
1191 | ||
24ec839c PZ |
1192 | tty = get_current_tty(); |
1193 | if (!tty) | |
452a00d2 | 1194 | return; |
bf097aaf | 1195 | tty_write_message(tty, warn->w_sb->s_id); |
8e893469 | 1196 | if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) |
24ec839c | 1197 | tty_write_message(tty, ": warning, "); |
1da177e4 | 1198 | else |
24ec839c | 1199 | tty_write_message(tty, ": write failed, "); |
7b9c7321 | 1200 | tty_write_message(tty, quotatypes[warn->w_dq_id.type]); |
1da177e4 | 1201 | switch (warntype) { |
8e893469 | 1202 | case QUOTA_NL_IHARDWARN: |
1da177e4 LT |
1203 | msg = " file limit reached.\r\n"; |
1204 | break; | |
8e893469 | 1205 | case QUOTA_NL_ISOFTLONGWARN: |
1da177e4 LT |
1206 | msg = " file quota exceeded too long.\r\n"; |
1207 | break; | |
8e893469 | 1208 | case QUOTA_NL_ISOFTWARN: |
1da177e4 LT |
1209 | msg = " file quota exceeded.\r\n"; |
1210 | break; | |
8e893469 | 1211 | case QUOTA_NL_BHARDWARN: |
1da177e4 LT |
1212 | msg = " block limit reached.\r\n"; |
1213 | break; | |
8e893469 | 1214 | case QUOTA_NL_BSOFTLONGWARN: |
1da177e4 LT |
1215 | msg = " block quota exceeded too long.\r\n"; |
1216 | break; | |
8e893469 | 1217 | case QUOTA_NL_BSOFTWARN: |
1da177e4 LT |
1218 | msg = " block quota exceeded.\r\n"; |
1219 | break; | |
1220 | } | |
24ec839c | 1221 | tty_write_message(tty, msg); |
452a00d2 | 1222 | tty_kref_put(tty); |
1da177e4 | 1223 | } |
8e893469 JK |
1224 | #endif |
1225 | ||
bf097aaf JK |
1226 | static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, |
1227 | int warntype) | |
1228 | { | |
1229 | if (warning_issued(dquot, warntype)) | |
1230 | return; | |
1231 | warn->w_type = warntype; | |
1232 | warn->w_sb = dquot->dq_sb; | |
1233 | warn->w_dq_id = dquot->dq_id; | |
bf097aaf JK |
1234 | } |
1235 | ||
f18df228 MC |
1236 | /* |
1237 | * Write warnings to the console and send warning messages over netlink. | |
1238 | * | |
bf097aaf | 1239 | * Note that this function can call into tty and networking code. |
f18df228 | 1240 | */ |
bf097aaf | 1241 | static void flush_warnings(struct dquot_warn *warn) |
1da177e4 LT |
1242 | { |
1243 | int i; | |
1244 | ||
86e931a3 | 1245 | for (i = 0; i < MAXQUOTAS; i++) { |
bf097aaf JK |
1246 | if (warn[i].w_type == QUOTA_NL_NOWARN) |
1247 | continue; | |
8e893469 | 1248 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
bf097aaf | 1249 | print_warning(&warn[i]); |
8e893469 | 1250 | #endif |
7b9c7321 | 1251 | quota_send_warning(warn[i].w_dq_id, |
bf097aaf | 1252 | warn[i].w_sb->s_dev, warn[i].w_type); |
86e931a3 | 1253 | } |
1da177e4 LT |
1254 | } |
1255 | ||
7a2435d8 | 1256 | static int ignore_hardlimit(struct dquot *dquot) |
1da177e4 | 1257 | { |
4c376dca | 1258 | struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
1da177e4 LT |
1259 | |
1260 | return capable(CAP_SYS_RESOURCE) && | |
268157ba | 1261 | (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || |
9c45101e | 1262 | !(info->dqi_flags & DQF_ROOT_SQUASH)); |
1da177e4 LT |
1263 | } |
1264 | ||
7b9ca4c6 JK |
1265 | static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, |
1266 | struct dquot_warn *warn) | |
1da177e4 | 1267 | { |
7b9ca4c6 JK |
1268 | qsize_t newinodes; |
1269 | int ret = 0; | |
268157ba | 1270 | |
7b9ca4c6 JK |
1271 | spin_lock(&dquot->dq_dqb_lock); |
1272 | newinodes = dquot->dq_dqb.dqb_curinodes + inodes; | |
4c376dca | 1273 | if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || |
f55abc0f | 1274 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
7b9ca4c6 | 1275 | goto add; |
1da177e4 LT |
1276 | |
1277 | if (dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1278 | newinodes > dquot->dq_dqb.dqb_ihardlimit && |
1da177e4 | 1279 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1280 | prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); |
7b9ca4c6 JK |
1281 | ret = -EDQUOT; |
1282 | goto out; | |
1da177e4 LT |
1283 | } |
1284 | ||
1285 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba JK |
1286 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1287 | dquot->dq_dqb.dqb_itime && | |
e008bb61 | 1288 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && |
1da177e4 | 1289 | !ignore_hardlimit(dquot)) { |
bf097aaf | 1290 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); |
7b9ca4c6 JK |
1291 | ret = -EDQUOT; |
1292 | goto out; | |
1da177e4 LT |
1293 | } |
1294 | ||
1295 | if (dquot->dq_dqb.dqb_isoftlimit && | |
268157ba | 1296 | newinodes > dquot->dq_dqb.dqb_isoftlimit && |
1da177e4 | 1297 | dquot->dq_dqb.dqb_itime == 0) { |
bf097aaf | 1298 | prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); |
e008bb61 | 1299 | dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + |
4c376dca | 1300 | sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; |
1da177e4 | 1301 | } |
7b9ca4c6 JK |
1302 | add: |
1303 | dquot->dq_dqb.dqb_curinodes = newinodes; | |
1da177e4 | 1304 | |
7b9ca4c6 JK |
1305 | out: |
1306 | spin_unlock(&dquot->dq_dqb_lock); | |
1307 | return ret; | |
1da177e4 LT |
1308 | } |
1309 | ||
7b9ca4c6 JK |
1310 | static int dquot_add_space(struct dquot *dquot, qsize_t space, |
1311 | qsize_t rsv_space, unsigned int flags, | |
1312 | struct dquot_warn *warn) | |
1da177e4 | 1313 | { |
f18df228 | 1314 | qsize_t tspace; |
268157ba | 1315 | struct super_block *sb = dquot->dq_sb; |
7b9ca4c6 | 1316 | int ret = 0; |
f18df228 | 1317 | |
7b9ca4c6 | 1318 | spin_lock(&dquot->dq_dqb_lock); |
4c376dca | 1319 | if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || |
f55abc0f | 1320 | test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
ac3d7939 | 1321 | goto finish; |
1da177e4 | 1322 | |
f18df228 | 1323 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace |
7b9ca4c6 JK |
1324 | + space + rsv_space; |
1325 | ||
1da177e4 | 1326 | if (dquot->dq_dqb.dqb_bhardlimit && |
f18df228 | 1327 | tspace > dquot->dq_dqb.dqb_bhardlimit && |
1da177e4 | 1328 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1329 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1330 | prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); |
7b9ca4c6 | 1331 | ret = -EDQUOT; |
ac3d7939 | 1332 | goto finish; |
1da177e4 LT |
1333 | } |
1334 | ||
1335 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1336 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
268157ba | 1337 | dquot->dq_dqb.dqb_btime && |
e008bb61 | 1338 | ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && |
1da177e4 | 1339 | !ignore_hardlimit(dquot)) { |
7b9ca4c6 | 1340 | if (flags & DQUOT_SPACE_WARN) |
bf097aaf | 1341 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); |
7b9ca4c6 | 1342 | ret = -EDQUOT; |
ac3d7939 | 1343 | goto finish; |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | if (dquot->dq_dqb.dqb_bsoftlimit && | |
f18df228 | 1347 | tspace > dquot->dq_dqb.dqb_bsoftlimit && |
1da177e4 | 1348 | dquot->dq_dqb.dqb_btime == 0) { |
7b9ca4c6 | 1349 | if (flags & DQUOT_SPACE_WARN) { |
bf097aaf | 1350 | prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); |
e008bb61 | 1351 | dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + |
4c376dca | 1352 | sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; |
7b9ca4c6 | 1353 | } else { |
1da177e4 LT |
1354 | /* |
1355 | * We don't allow preallocation to exceed softlimit so exceeding will | |
1356 | * be always printed | |
1357 | */ | |
7b9ca4c6 | 1358 | ret = -EDQUOT; |
ac3d7939 | 1359 | goto finish; |
7b9ca4c6 | 1360 | } |
1da177e4 | 1361 | } |
ac3d7939 JK |
1362 | finish: |
1363 | /* | |
1364 | * We have to be careful and go through warning generation & grace time | |
1365 | * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it | |
1366 | * only here... | |
1367 | */ | |
1368 | if (flags & DQUOT_SPACE_NOFAIL) | |
1369 | ret = 0; | |
1370 | if (!ret) { | |
1371 | dquot->dq_dqb.dqb_rsvspace += rsv_space; | |
1372 | dquot->dq_dqb.dqb_curspace += space; | |
1373 | } | |
7b9ca4c6 JK |
1374 | spin_unlock(&dquot->dq_dqb_lock); |
1375 | return ret; | |
1da177e4 LT |
1376 | } |
1377 | ||
12095460 | 1378 | static int info_idq_free(struct dquot *dquot, qsize_t inodes) |
657d3bfa | 1379 | { |
268157ba JK |
1380 | qsize_t newinodes; |
1381 | ||
657d3bfa | 1382 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
f55abc0f | 1383 | dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || |
4c376dca | 1384 | !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) |
657d3bfa JK |
1385 | return QUOTA_NL_NOWARN; |
1386 | ||
268157ba JK |
1387 | newinodes = dquot->dq_dqb.dqb_curinodes - inodes; |
1388 | if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) | |
657d3bfa JK |
1389 | return QUOTA_NL_ISOFTBELOW; |
1390 | if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && | |
268157ba | 1391 | newinodes < dquot->dq_dqb.dqb_ihardlimit) |
657d3bfa JK |
1392 | return QUOTA_NL_IHARDBELOW; |
1393 | return QUOTA_NL_NOWARN; | |
1394 | } | |
1395 | ||
1396 | static int info_bdq_free(struct dquot *dquot, qsize_t space) | |
1397 | { | |
41e327b5 | 1398 | qsize_t tspace; |
1399 | ||
1400 | tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; | |
1401 | ||
657d3bfa | 1402 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || |
41e327b5 | 1403 | tspace <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa JK |
1404 | return QUOTA_NL_NOWARN; |
1405 | ||
41e327b5 | 1406 | if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) |
657d3bfa | 1407 | return QUOTA_NL_BSOFTBELOW; |
41e327b5 | 1408 | if (tspace >= dquot->dq_dqb.dqb_bhardlimit && |
1409 | tspace - space < dquot->dq_dqb.dqb_bhardlimit) | |
657d3bfa JK |
1410 | return QUOTA_NL_BHARDBELOW; |
1411 | return QUOTA_NL_NOWARN; | |
1412 | } | |
0a5a9c72 | 1413 | |
189eef59 CH |
1414 | static int dquot_active(const struct inode *inode) |
1415 | { | |
1416 | struct super_block *sb = inode->i_sb; | |
1417 | ||
1418 | if (IS_NOQUOTA(inode)) | |
1419 | return 0; | |
1420 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); | |
1421 | } | |
1422 | ||
1da177e4 | 1423 | /* |
871a2931 CH |
1424 | * Initialize quota pointers in inode |
1425 | * | |
871a2931 CH |
1426 | * It is better to call this function outside of any transaction as it |
1427 | * might need a lot of space in journal for dquot structure allocation. | |
1da177e4 | 1428 | */ |
6184fc0b | 1429 | static int __dquot_initialize(struct inode *inode, int type) |
1da177e4 | 1430 | { |
1ea06bec | 1431 | int cnt, init_needed = 0; |
ab73ef46 | 1432 | struct dquot **dquots, *got[MAXQUOTAS] = {}; |
cc33412f | 1433 | struct super_block *sb = inode->i_sb; |
0a5a9c72 | 1434 | qsize_t rsv; |
6184fc0b | 1435 | int ret = 0; |
1da177e4 | 1436 | |
189eef59 | 1437 | if (!dquot_active(inode)) |
6184fc0b | 1438 | return 0; |
cc33412f | 1439 | |
5bcd3b6f KK |
1440 | dquots = i_dquot(inode); |
1441 | ||
cc33412f JK |
1442 | /* First get references to structures we might need. */ |
1443 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
aca645a6 | 1444 | struct kqid qid; |
847aac64 LX |
1445 | kprojid_t projid; |
1446 | int rc; | |
6184fc0b | 1447 | struct dquot *dquot; |
847aac64 | 1448 | |
cc33412f JK |
1449 | if (type != -1 && cnt != type) |
1450 | continue; | |
1ea06bec NY |
1451 | /* |
1452 | * The i_dquot should have been initialized in most cases, | |
1453 | * we check it without locking here to avoid unnecessary | |
1454 | * dqget()/dqput() calls. | |
1455 | */ | |
5bcd3b6f | 1456 | if (dquots[cnt]) |
1ea06bec | 1457 | continue; |
847aac64 LX |
1458 | |
1459 | if (!sb_has_quota_active(sb, cnt)) | |
1460 | continue; | |
1461 | ||
1ea06bec NY |
1462 | init_needed = 1; |
1463 | ||
cc33412f JK |
1464 | switch (cnt) { |
1465 | case USRQUOTA: | |
aca645a6 | 1466 | qid = make_kqid_uid(inode->i_uid); |
cc33412f JK |
1467 | break; |
1468 | case GRPQUOTA: | |
aca645a6 | 1469 | qid = make_kqid_gid(inode->i_gid); |
cc33412f | 1470 | break; |
847aac64 LX |
1471 | case PRJQUOTA: |
1472 | rc = inode->i_sb->dq_op->get_projid(inode, &projid); | |
1473 | if (rc) | |
1474 | continue; | |
1475 | qid = make_kqid_projid(projid); | |
1476 | break; | |
cc33412f | 1477 | } |
6184fc0b JK |
1478 | dquot = dqget(sb, qid); |
1479 | if (IS_ERR(dquot)) { | |
1480 | /* We raced with somebody turning quotas off... */ | |
1481 | if (PTR_ERR(dquot) != -ESRCH) { | |
1482 | ret = PTR_ERR(dquot); | |
1483 | goto out_put; | |
1484 | } | |
1485 | dquot = NULL; | |
1486 | } | |
1487 | got[cnt] = dquot; | |
cc33412f JK |
1488 | } |
1489 | ||
1ea06bec NY |
1490 | /* All required i_dquot has been initialized */ |
1491 | if (!init_needed) | |
6184fc0b | 1492 | return 0; |
1ea06bec | 1493 | |
b9ba6f94 | 1494 | spin_lock(&dq_data_lock); |
1da177e4 | 1495 | if (IS_NOQUOTA(inode)) |
6184fc0b | 1496 | goto out_lock; |
1da177e4 LT |
1497 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1498 | if (type != -1 && cnt != type) | |
1499 | continue; | |
cc33412f JK |
1500 | /* Avoid races with quotaoff() */ |
1501 | if (!sb_has_quota_active(sb, cnt)) | |
1502 | continue; | |
4408ea41 JK |
1503 | /* We could race with quotaon or dqget() could have failed */ |
1504 | if (!got[cnt]) | |
1505 | continue; | |
5bcd3b6f KK |
1506 | if (!dquots[cnt]) { |
1507 | dquots[cnt] = got[cnt]; | |
dd6f3c6d | 1508 | got[cnt] = NULL; |
0a5a9c72 JK |
1509 | /* |
1510 | * Make quota reservation system happy if someone | |
1511 | * did a write before quota was turned on | |
1512 | */ | |
1513 | rsv = inode_get_rsv_space(inode); | |
7b9ca4c6 JK |
1514 | if (unlikely(rsv)) { |
1515 | spin_lock(&inode->i_lock); | |
1516 | /* Get reservation again under proper lock */ | |
1517 | rsv = __inode_get_rsv_space(inode); | |
1518 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
1519 | dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; | |
1520 | spin_unlock(&dquots[cnt]->dq_dqb_lock); | |
1521 | spin_unlock(&inode->i_lock); | |
1522 | } | |
1da177e4 LT |
1523 | } |
1524 | } | |
6184fc0b | 1525 | out_lock: |
b9ba6f94 | 1526 | spin_unlock(&dq_data_lock); |
6184fc0b | 1527 | out_put: |
cc33412f | 1528 | /* Drop unused references */ |
dc52dd3a | 1529 | dqput_all(got); |
6184fc0b JK |
1530 | |
1531 | return ret; | |
871a2931 CH |
1532 | } |
1533 | ||
6184fc0b | 1534 | int dquot_initialize(struct inode *inode) |
871a2931 | 1535 | { |
6184fc0b | 1536 | return __dquot_initialize(inode, -1); |
1da177e4 | 1537 | } |
08d0350c | 1538 | EXPORT_SYMBOL(dquot_initialize); |
1da177e4 | 1539 | |
b8cb5a54 TE |
1540 | bool dquot_initialize_needed(struct inode *inode) |
1541 | { | |
1542 | struct dquot **dquots; | |
1543 | int i; | |
1544 | ||
1545 | if (!dquot_active(inode)) | |
1546 | return false; | |
1547 | ||
1548 | dquots = i_dquot(inode); | |
1549 | for (i = 0; i < MAXQUOTAS; i++) | |
1550 | if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) | |
1551 | return true; | |
1552 | return false; | |
1553 | } | |
1554 | EXPORT_SYMBOL(dquot_initialize_needed); | |
1555 | ||
1da177e4 | 1556 | /* |
b9ba6f94 NY |
1557 | * Release all quotas referenced by inode. |
1558 | * | |
1559 | * This function only be called on inode free or converting | |
1560 | * a file to quota file, no other users for the i_dquot in | |
1561 | * both cases, so we needn't call synchronize_srcu() after | |
1562 | * clearing i_dquot. | |
1da177e4 | 1563 | */ |
9f754758 | 1564 | static void __dquot_drop(struct inode *inode) |
1da177e4 LT |
1565 | { |
1566 | int cnt; | |
5bcd3b6f | 1567 | struct dquot **dquots = i_dquot(inode); |
cc33412f | 1568 | struct dquot *put[MAXQUOTAS]; |
1da177e4 | 1569 | |
b9ba6f94 | 1570 | spin_lock(&dq_data_lock); |
1da177e4 | 1571 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f KK |
1572 | put[cnt] = dquots[cnt]; |
1573 | dquots[cnt] = NULL; | |
1da177e4 | 1574 | } |
b9ba6f94 | 1575 | spin_unlock(&dq_data_lock); |
dc52dd3a | 1576 | dqput_all(put); |
1da177e4 LT |
1577 | } |
1578 | ||
9f754758 CH |
1579 | void dquot_drop(struct inode *inode) |
1580 | { | |
5bcd3b6f | 1581 | struct dquot * const *dquots; |
9f754758 CH |
1582 | int cnt; |
1583 | ||
1584 | if (IS_NOQUOTA(inode)) | |
1585 | return; | |
1586 | ||
1587 | /* | |
1588 | * Test before calling to rule out calls from proc and such | |
1589 | * where we are not allowed to block. Note that this is | |
1590 | * actually reliable test even without the lock - the caller | |
1591 | * must assure that nobody can come after the DQUOT_DROP and | |
1592 | * add quota pointers back anyway. | |
1593 | */ | |
5bcd3b6f | 1594 | dquots = i_dquot(inode); |
9f754758 | 1595 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
5bcd3b6f | 1596 | if (dquots[cnt]) |
9f754758 CH |
1597 | break; |
1598 | } | |
1599 | ||
1600 | if (cnt < MAXQUOTAS) | |
1601 | __dquot_drop(inode); | |
1602 | } | |
1603 | EXPORT_SYMBOL(dquot_drop); | |
b85f4b87 | 1604 | |
fd8fbfc1 DM |
1605 | /* |
1606 | * inode_reserved_space is managed internally by quota, and protected by | |
1607 | * i_lock similar to i_blocks+i_bytes. | |
1608 | */ | |
1609 | static qsize_t *inode_reserved_space(struct inode * inode) | |
1610 | { | |
1611 | /* Filesystem must explicitly define it's own method in order to use | |
1612 | * quota reservation interface */ | |
1613 | BUG_ON(!inode->i_sb->dq_op->get_reserved_space); | |
1614 | return inode->i_sb->dq_op->get_reserved_space(inode); | |
1615 | } | |
1616 | ||
7b9ca4c6 | 1617 | static qsize_t __inode_get_rsv_space(struct inode *inode) |
fd8fbfc1 | 1618 | { |
7b9ca4c6 JK |
1619 | if (!inode->i_sb->dq_op->get_reserved_space) |
1620 | return 0; | |
1621 | return *inode_reserved_space(inode); | |
fd8fbfc1 DM |
1622 | } |
1623 | ||
1624 | static qsize_t inode_get_rsv_space(struct inode *inode) | |
1625 | { | |
1626 | qsize_t ret; | |
05b5d898 JK |
1627 | |
1628 | if (!inode->i_sb->dq_op->get_reserved_space) | |
1629 | return 0; | |
fd8fbfc1 | 1630 | spin_lock(&inode->i_lock); |
7b9ca4c6 | 1631 | ret = __inode_get_rsv_space(inode); |
fd8fbfc1 DM |
1632 | spin_unlock(&inode->i_lock); |
1633 | return ret; | |
1634 | } | |
1635 | ||
1da177e4 | 1636 | /* |
5dd4056d CH |
1637 | * This functions updates i_blocks+i_bytes fields and quota information |
1638 | * (together with appropriate checks). | |
1639 | * | |
1640 | * NOTE: We absolutely rely on the fact that caller dirties the inode | |
1641 | * (usually helpers in quotaops.h care about this) and holds a handle for | |
1642 | * the current transaction so that dquot write and inode write go into the | |
1643 | * same transaction. | |
1da177e4 LT |
1644 | */ |
1645 | ||
1646 | /* | |
1647 | * This operation can block, but only after everything is updated | |
1648 | */ | |
56246f9a | 1649 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 | 1650 | { |
b9ba6f94 | 1651 | int cnt, ret = 0, index; |
bf097aaf | 1652 | struct dquot_warn warn[MAXQUOTAS]; |
56246f9a | 1653 | int reserve = flags & DQUOT_SPACE_RESERVE; |
5bcd3b6f | 1654 | struct dquot **dquots; |
1da177e4 | 1655 | |
189eef59 | 1656 | if (!dquot_active(inode)) { |
a478e522 JK |
1657 | if (reserve) { |
1658 | spin_lock(&inode->i_lock); | |
1659 | *inode_reserved_space(inode) += number; | |
1660 | spin_unlock(&inode->i_lock); | |
1661 | } else { | |
1662 | inode_add_bytes(inode, number); | |
1663 | } | |
fd8fbfc1 DM |
1664 | goto out; |
1665 | } | |
1666 | ||
1da177e4 | 1667 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1668 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
1da177e4 | 1669 | |
5bcd3b6f | 1670 | dquots = i_dquot(inode); |
b9ba6f94 | 1671 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1672 | spin_lock(&inode->i_lock); |
1da177e4 | 1673 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1674 | if (!dquots[cnt]) |
1da177e4 | 1675 | continue; |
df15a2a5 | 1676 | if (reserve) { |
7b9ca4c6 JK |
1677 | ret = dquot_add_space(dquots[cnt], 0, number, flags, |
1678 | &warn[cnt]); | |
1679 | } else { | |
1680 | ret = dquot_add_space(dquots[cnt], number, 0, flags, | |
1681 | &warn[cnt]); | |
1682 | } | |
1683 | if (ret) { | |
1684 | /* Back out changes we already did */ | |
1685 | for (cnt--; cnt >= 0; cnt--) { | |
1686 | if (!dquots[cnt]) | |
1687 | continue; | |
1688 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a CX |
1689 | if (reserve) |
1690 | dquot_free_reserved_space(dquots[cnt], | |
1691 | number); | |
1692 | else | |
1693 | dquot_decr_space(dquots[cnt], number); | |
7b9ca4c6 JK |
1694 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1695 | } | |
1696 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 | 1697 | goto out_flush_warn; |
f18df228 | 1698 | } |
1da177e4 | 1699 | } |
7b9ca4c6 | 1700 | if (reserve) |
a478e522 | 1701 | *inode_reserved_space(inode) += number; |
7b9ca4c6 JK |
1702 | else |
1703 | __inode_add_bytes(inode, number); | |
1704 | spin_unlock(&inode->i_lock); | |
f18df228 | 1705 | |
fd8fbfc1 DM |
1706 | if (reserve) |
1707 | goto out_flush_warn; | |
bf097aaf | 1708 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1709 | out_flush_warn: |
b9ba6f94 | 1710 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1711 | flush_warnings(warn); |
f18df228 MC |
1712 | out: |
1713 | return ret; | |
1714 | } | |
5dd4056d | 1715 | EXPORT_SYMBOL(__dquot_alloc_space); |
1da177e4 LT |
1716 | |
1717 | /* | |
1718 | * This operation can block, but only after everything is updated | |
1719 | */ | |
6bab3596 | 1720 | int dquot_alloc_inode(struct inode *inode) |
1da177e4 | 1721 | { |
b9ba6f94 | 1722 | int cnt, ret = 0, index; |
bf097aaf | 1723 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1724 | struct dquot * const *dquots; |
1da177e4 | 1725 | |
189eef59 | 1726 | if (!dquot_active(inode)) |
63936dda | 1727 | return 0; |
1da177e4 | 1728 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
bf097aaf | 1729 | warn[cnt].w_type = QUOTA_NL_NOWARN; |
b9ba6f94 | 1730 | |
5bcd3b6f | 1731 | dquots = i_dquot(inode); |
b9ba6f94 | 1732 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1733 | spin_lock(&inode->i_lock); |
1da177e4 | 1734 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf | 1735 | if (!dquots[cnt]) |
1da177e4 | 1736 | continue; |
7b9ca4c6 JK |
1737 | ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); |
1738 | if (ret) { | |
1739 | for (cnt--; cnt >= 0; cnt--) { | |
1740 | if (!dquots[cnt]) | |
1741 | continue; | |
1742 | /* Back out changes we already did */ | |
1743 | spin_lock(&dquots[cnt]->dq_dqb_lock); | |
632a9f3a | 1744 | dquot_decr_inodes(dquots[cnt], 1); |
7b9ca4c6 JK |
1745 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1746 | } | |
1da177e4 | 1747 | goto warn_put_all; |
7b9ca4c6 | 1748 | } |
1da177e4 | 1749 | } |
efd8f0e6 | 1750 | |
1da177e4 | 1751 | warn_put_all: |
7b9ca4c6 | 1752 | spin_unlock(&inode->i_lock); |
63936dda | 1753 | if (ret == 0) |
bf097aaf | 1754 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1755 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1756 | flush_warnings(warn); |
1da177e4 LT |
1757 | return ret; |
1758 | } | |
08d0350c | 1759 | EXPORT_SYMBOL(dquot_alloc_inode); |
1da177e4 | 1760 | |
5dd4056d CH |
1761 | /* |
1762 | * Convert in-memory reserved quotas to real consumed quotas | |
1763 | */ | |
1764 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
740d9dcd | 1765 | { |
5bcd3b6f | 1766 | struct dquot **dquots; |
b9ba6f94 | 1767 | int cnt, index; |
740d9dcd | 1768 | |
189eef59 | 1769 | if (!dquot_active(inode)) { |
0ed60de3 JK |
1770 | spin_lock(&inode->i_lock); |
1771 | *inode_reserved_space(inode) -= number; | |
1772 | __inode_add_bytes(inode, number); | |
1773 | spin_unlock(&inode->i_lock); | |
5dd4056d | 1774 | return 0; |
740d9dcd MC |
1775 | } |
1776 | ||
5bcd3b6f | 1777 | dquots = i_dquot(inode); |
b9ba6f94 | 1778 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1779 | spin_lock(&inode->i_lock); |
740d9dcd MC |
1780 | /* Claim reserved quotas to allocated quotas */ |
1781 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1782 | if (dquots[cnt]) { |
1783 | struct dquot *dquot = dquots[cnt]; | |
1784 | ||
7b9ca4c6 | 1785 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1786 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) |
1787 | number = dquot->dq_dqb.dqb_rsvspace; | |
1788 | dquot->dq_dqb.dqb_curspace += number; | |
1789 | dquot->dq_dqb.dqb_rsvspace -= number; | |
7b9ca4c6 | 1790 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1791 | } |
740d9dcd MC |
1792 | } |
1793 | /* Update inode bytes */ | |
0ed60de3 JK |
1794 | *inode_reserved_space(inode) -= number; |
1795 | __inode_add_bytes(inode, number); | |
1796 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1797 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1798 | srcu_read_unlock(&dquot_srcu, index); |
5dd4056d | 1799 | return 0; |
740d9dcd | 1800 | } |
5dd4056d | 1801 | EXPORT_SYMBOL(dquot_claim_space_nodirty); |
740d9dcd | 1802 | |
1c8924eb JK |
1803 | /* |
1804 | * Convert allocated space back to in-memory reserved quotas | |
1805 | */ | |
1806 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) | |
1807 | { | |
5bcd3b6f | 1808 | struct dquot **dquots; |
b9ba6f94 | 1809 | int cnt, index; |
1c8924eb JK |
1810 | |
1811 | if (!dquot_active(inode)) { | |
0ed60de3 JK |
1812 | spin_lock(&inode->i_lock); |
1813 | *inode_reserved_space(inode) += number; | |
1814 | __inode_sub_bytes(inode, number); | |
1815 | spin_unlock(&inode->i_lock); | |
1c8924eb JK |
1816 | return; |
1817 | } | |
1818 | ||
5bcd3b6f | 1819 | dquots = i_dquot(inode); |
b9ba6f94 | 1820 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1821 | spin_lock(&inode->i_lock); |
1c8924eb JK |
1822 | /* Claim reserved quotas to allocated quotas */ |
1823 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { | |
3ab167d2 JK |
1824 | if (dquots[cnt]) { |
1825 | struct dquot *dquot = dquots[cnt]; | |
1826 | ||
7b9ca4c6 | 1827 | spin_lock(&dquot->dq_dqb_lock); |
3ab167d2 JK |
1828 | if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) |
1829 | number = dquot->dq_dqb.dqb_curspace; | |
1830 | dquot->dq_dqb.dqb_rsvspace += number; | |
1831 | dquot->dq_dqb.dqb_curspace -= number; | |
7b9ca4c6 | 1832 | spin_unlock(&dquot->dq_dqb_lock); |
3ab167d2 | 1833 | } |
1c8924eb JK |
1834 | } |
1835 | /* Update inode bytes */ | |
0ed60de3 JK |
1836 | *inode_reserved_space(inode) += number; |
1837 | __inode_sub_bytes(inode, number); | |
1838 | spin_unlock(&inode->i_lock); | |
5bcd3b6f | 1839 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1840 | srcu_read_unlock(&dquot_srcu, index); |
1c8924eb JK |
1841 | return; |
1842 | } | |
1843 | EXPORT_SYMBOL(dquot_reclaim_space_nodirty); | |
1844 | ||
1da177e4 LT |
1845 | /* |
1846 | * This operation can block, but only after everything is updated | |
1847 | */ | |
56246f9a | 1848 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags) |
1da177e4 LT |
1849 | { |
1850 | unsigned int cnt; | |
bf097aaf | 1851 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1852 | struct dquot **dquots; |
b9ba6f94 | 1853 | int reserve = flags & DQUOT_SPACE_RESERVE, index; |
1da177e4 | 1854 | |
189eef59 | 1855 | if (!dquot_active(inode)) { |
a478e522 JK |
1856 | if (reserve) { |
1857 | spin_lock(&inode->i_lock); | |
1858 | *inode_reserved_space(inode) -= number; | |
1859 | spin_unlock(&inode->i_lock); | |
1860 | } else { | |
1861 | inode_sub_bytes(inode, number); | |
1862 | } | |
5dd4056d | 1863 | return; |
1da177e4 | 1864 | } |
657d3bfa | 1865 | |
5bcd3b6f | 1866 | dquots = i_dquot(inode); |
b9ba6f94 | 1867 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1868 | spin_lock(&inode->i_lock); |
1da177e4 | 1869 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1870 | int wtype; |
1871 | ||
1872 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1873 | if (!dquots[cnt]) | |
1da177e4 | 1874 | continue; |
7b9ca4c6 | 1875 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1876 | wtype = info_bdq_free(dquots[cnt], number); |
1877 | if (wtype != QUOTA_NL_NOWARN) | |
1878 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
fd8fbfc1 | 1879 | if (reserve) |
bf097aaf | 1880 | dquot_free_reserved_space(dquots[cnt], number); |
fd8fbfc1 | 1881 | else |
bf097aaf | 1882 | dquot_decr_space(dquots[cnt], number); |
7b9ca4c6 | 1883 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1884 | } |
7b9ca4c6 | 1885 | if (reserve) |
a478e522 | 1886 | *inode_reserved_space(inode) -= number; |
7b9ca4c6 JK |
1887 | else |
1888 | __inode_sub_bytes(inode, number); | |
1889 | spin_unlock(&inode->i_lock); | |
fd8fbfc1 DM |
1890 | |
1891 | if (reserve) | |
1892 | goto out_unlock; | |
bf097aaf | 1893 | mark_all_dquot_dirty(dquots); |
fd8fbfc1 | 1894 | out_unlock: |
b9ba6f94 | 1895 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1896 | flush_warnings(warn); |
fd8fbfc1 | 1897 | } |
5dd4056d | 1898 | EXPORT_SYMBOL(__dquot_free_space); |
fd8fbfc1 | 1899 | |
1da177e4 LT |
1900 | /* |
1901 | * This operation can block, but only after everything is updated | |
1902 | */ | |
6bab3596 | 1903 | void dquot_free_inode(struct inode *inode) |
1da177e4 LT |
1904 | { |
1905 | unsigned int cnt; | |
bf097aaf | 1906 | struct dquot_warn warn[MAXQUOTAS]; |
5bcd3b6f | 1907 | struct dquot * const *dquots; |
b9ba6f94 | 1908 | int index; |
1da177e4 | 1909 | |
189eef59 | 1910 | if (!dquot_active(inode)) |
63936dda | 1911 | return; |
657d3bfa | 1912 | |
5bcd3b6f | 1913 | dquots = i_dquot(inode); |
b9ba6f94 | 1914 | index = srcu_read_lock(&dquot_srcu); |
7b9ca4c6 | 1915 | spin_lock(&inode->i_lock); |
1da177e4 | 1916 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
bf097aaf JK |
1917 | int wtype; |
1918 | ||
1919 | warn[cnt].w_type = QUOTA_NL_NOWARN; | |
1920 | if (!dquots[cnt]) | |
1da177e4 | 1921 | continue; |
7b9ca4c6 | 1922 | spin_lock(&dquots[cnt]->dq_dqb_lock); |
bf097aaf JK |
1923 | wtype = info_idq_free(dquots[cnt], 1); |
1924 | if (wtype != QUOTA_NL_NOWARN) | |
1925 | prepare_warning(&warn[cnt], dquots[cnt], wtype); | |
1926 | dquot_decr_inodes(dquots[cnt], 1); | |
7b9ca4c6 | 1927 | spin_unlock(&dquots[cnt]->dq_dqb_lock); |
1da177e4 | 1928 | } |
7b9ca4c6 | 1929 | spin_unlock(&inode->i_lock); |
bf097aaf | 1930 | mark_all_dquot_dirty(dquots); |
b9ba6f94 | 1931 | srcu_read_unlock(&dquot_srcu, index); |
bf097aaf | 1932 | flush_warnings(warn); |
1da177e4 | 1933 | } |
08d0350c | 1934 | EXPORT_SYMBOL(dquot_free_inode); |
1da177e4 LT |
1935 | |
1936 | /* | |
1937 | * Transfer the number of inode and blocks from one diskquota to an other. | |
bc8e5f07 JK |
1938 | * On success, dquot references in transfer_to are consumed and references |
1939 | * to original dquots that need to be released are placed there. On failure, | |
1940 | * references are kept untouched. | |
1da177e4 LT |
1941 | * |
1942 | * This operation can block, but only after everything is updated | |
1943 | * A transaction must be started when entering this function. | |
bc8e5f07 | 1944 | * |
b9ba6f94 NY |
1945 | * We are holding reference on transfer_from & transfer_to, no need to |
1946 | * protect them by srcu_read_lock(). | |
1da177e4 | 1947 | */ |
bc8e5f07 | 1948 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) |
1da177e4 | 1949 | { |
7b9ca4c6 | 1950 | qsize_t cur_space; |
740d9dcd | 1951 | qsize_t rsv_space = 0; |
7a9ca53a | 1952 | qsize_t inode_usage = 1; |
bc8e5f07 | 1953 | struct dquot *transfer_from[MAXQUOTAS] = {}; |
efd8f0e6 | 1954 | int cnt, ret = 0; |
9e32784b | 1955 | char is_valid[MAXQUOTAS] = {}; |
bf097aaf JK |
1956 | struct dquot_warn warn_to[MAXQUOTAS]; |
1957 | struct dquot_warn warn_from_inodes[MAXQUOTAS]; | |
1958 | struct dquot_warn warn_from_space[MAXQUOTAS]; | |
1da177e4 | 1959 | |
1da177e4 | 1960 | if (IS_NOQUOTA(inode)) |
efd8f0e6 | 1961 | return 0; |
7a9ca53a TE |
1962 | |
1963 | if (inode->i_sb->dq_op->get_inode_usage) { | |
1964 | ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); | |
1965 | if (ret) | |
1966 | return ret; | |
1967 | } | |
1968 | ||
cc33412f | 1969 | /* Initialize the arrays */ |
bf097aaf JK |
1970 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1971 | warn_to[cnt].w_type = QUOTA_NL_NOWARN; | |
1972 | warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; | |
1973 | warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; | |
1974 | } | |
b9ba6f94 NY |
1975 | |
1976 | spin_lock(&dq_data_lock); | |
7b9ca4c6 | 1977 | spin_lock(&inode->i_lock); |
cc33412f | 1978 | if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ |
7b9ca4c6 | 1979 | spin_unlock(&inode->i_lock); |
b9ba6f94 | 1980 | spin_unlock(&dq_data_lock); |
bc8e5f07 | 1981 | return 0; |
cc33412f | 1982 | } |
7b9ca4c6 JK |
1983 | cur_space = __inode_get_bytes(inode); |
1984 | rsv_space = __inode_get_rsv_space(inode); | |
1985 | /* | |
1986 | * Build the transfer_from list, check limits, and update usage in | |
1987 | * the target structures. | |
1988 | */ | |
1da177e4 | 1989 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b D |
1990 | /* |
1991 | * Skip changes for same uid or gid or for turned off quota-type. | |
1992 | */ | |
dd6f3c6d | 1993 | if (!transfer_to[cnt]) |
1da177e4 | 1994 | continue; |
9e32784b D |
1995 | /* Avoid races with quotaoff() */ |
1996 | if (!sb_has_quota_active(inode->i_sb, cnt)) | |
1997 | continue; | |
1998 | is_valid[cnt] = 1; | |
2d0fa467 | 1999 | transfer_from[cnt] = i_dquot(inode)[cnt]; |
7b9ca4c6 JK |
2000 | ret = dquot_add_inodes(transfer_to[cnt], inode_usage, |
2001 | &warn_to[cnt]); | |
efd8f0e6 CH |
2002 | if (ret) |
2003 | goto over_quota; | |
c6d9c35d | 2004 | ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, |
2005 | DQUOT_SPACE_WARN, &warn_to[cnt]); | |
7b9ca4c6 | 2006 | if (ret) { |
0a51fb71 | 2007 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); |
7b9ca4c6 | 2008 | dquot_decr_inodes(transfer_to[cnt], inode_usage); |
0a51fb71 | 2009 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); |
cc33412f | 2010 | goto over_quota; |
7b9ca4c6 | 2011 | } |
1da177e4 LT |
2012 | } |
2013 | ||
7b9ca4c6 | 2014 | /* Decrease usage for source structures and update quota pointers */ |
1da177e4 | 2015 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
9e32784b | 2016 | if (!is_valid[cnt]) |
1da177e4 | 2017 | continue; |
1da177e4 LT |
2018 | /* Due to IO error we might not have transfer_from[] structure */ |
2019 | if (transfer_from[cnt]) { | |
bf097aaf | 2020 | int wtype; |
7b9ca4c6 JK |
2021 | |
2022 | spin_lock(&transfer_from[cnt]->dq_dqb_lock); | |
7a9ca53a | 2023 | wtype = info_idq_free(transfer_from[cnt], inode_usage); |
bf097aaf JK |
2024 | if (wtype != QUOTA_NL_NOWARN) |
2025 | prepare_warning(&warn_from_inodes[cnt], | |
2026 | transfer_from[cnt], wtype); | |
7b9ca4c6 JK |
2027 | wtype = info_bdq_free(transfer_from[cnt], |
2028 | cur_space + rsv_space); | |
bf097aaf JK |
2029 | if (wtype != QUOTA_NL_NOWARN) |
2030 | prepare_warning(&warn_from_space[cnt], | |
2031 | transfer_from[cnt], wtype); | |
7a9ca53a | 2032 | dquot_decr_inodes(transfer_from[cnt], inode_usage); |
740d9dcd MC |
2033 | dquot_decr_space(transfer_from[cnt], cur_space); |
2034 | dquot_free_reserved_space(transfer_from[cnt], | |
2035 | rsv_space); | |
7b9ca4c6 | 2036 | spin_unlock(&transfer_from[cnt]->dq_dqb_lock); |
1da177e4 | 2037 | } |
2d0fa467 | 2038 | i_dquot(inode)[cnt] = transfer_to[cnt]; |
1da177e4 | 2039 | } |
7b9ca4c6 | 2040 | spin_unlock(&inode->i_lock); |
1da177e4 | 2041 | spin_unlock(&dq_data_lock); |
cc33412f | 2042 | |
dc52dd3a DM |
2043 | mark_all_dquot_dirty(transfer_from); |
2044 | mark_all_dquot_dirty(transfer_to); | |
bf097aaf JK |
2045 | flush_warnings(warn_to); |
2046 | flush_warnings(warn_from_inodes); | |
2047 | flush_warnings(warn_from_space); | |
bc8e5f07 | 2048 | /* Pass back references to put */ |
dc52dd3a | 2049 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
9e32784b D |
2050 | if (is_valid[cnt]) |
2051 | transfer_to[cnt] = transfer_from[cnt]; | |
86f3cbec | 2052 | return 0; |
cc33412f | 2053 | over_quota: |
7b9ca4c6 JK |
2054 | /* Back out changes we already did */ |
2055 | for (cnt--; cnt >= 0; cnt--) { | |
2056 | if (!is_valid[cnt]) | |
2057 | continue; | |
2058 | spin_lock(&transfer_to[cnt]->dq_dqb_lock); | |
2059 | dquot_decr_inodes(transfer_to[cnt], inode_usage); | |
2060 | dquot_decr_space(transfer_to[cnt], cur_space); | |
2061 | dquot_free_reserved_space(transfer_to[cnt], rsv_space); | |
2062 | spin_unlock(&transfer_to[cnt]->dq_dqb_lock); | |
2063 | } | |
2064 | spin_unlock(&inode->i_lock); | |
cc33412f | 2065 | spin_unlock(&dq_data_lock); |
bf097aaf | 2066 | flush_warnings(warn_to); |
86f3cbec | 2067 | return ret; |
1da177e4 | 2068 | } |
bc8e5f07 | 2069 | EXPORT_SYMBOL(__dquot_transfer); |
1da177e4 | 2070 | |
8ddd69d6 DM |
2071 | /* Wrapper for transferring ownership of an inode for uid/gid only |
2072 | * Called from FSXXX_setattr() | |
2073 | */ | |
b43fa828 | 2074 | int dquot_transfer(struct inode *inode, struct iattr *iattr) |
b85f4b87 | 2075 | { |
bc8e5f07 | 2076 | struct dquot *transfer_to[MAXQUOTAS] = {}; |
6184fc0b | 2077 | struct dquot *dquot; |
bc8e5f07 JK |
2078 | struct super_block *sb = inode->i_sb; |
2079 | int ret; | |
8ddd69d6 | 2080 | |
189eef59 | 2081 | if (!dquot_active(inode)) |
bc8e5f07 | 2082 | return 0; |
12755627 | 2083 | |
6184fc0b JK |
2084 | if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ |
2085 | dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); | |
2086 | if (IS_ERR(dquot)) { | |
2087 | if (PTR_ERR(dquot) != -ESRCH) { | |
2088 | ret = PTR_ERR(dquot); | |
2089 | goto out_put; | |
2090 | } | |
2091 | dquot = NULL; | |
2092 | } | |
2093 | transfer_to[USRQUOTA] = dquot; | |
2094 | } | |
2095 | if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ | |
2096 | dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); | |
2097 | if (IS_ERR(dquot)) { | |
2098 | if (PTR_ERR(dquot) != -ESRCH) { | |
2099 | ret = PTR_ERR(dquot); | |
2100 | goto out_put; | |
2101 | } | |
2102 | dquot = NULL; | |
2103 | } | |
2104 | transfer_to[GRPQUOTA] = dquot; | |
2105 | } | |
bc8e5f07 | 2106 | ret = __dquot_transfer(inode, transfer_to); |
6184fc0b | 2107 | out_put: |
bc8e5f07 JK |
2108 | dqput_all(transfer_to); |
2109 | return ret; | |
b85f4b87 | 2110 | } |
b43fa828 | 2111 | EXPORT_SYMBOL(dquot_transfer); |
b85f4b87 | 2112 | |
1da177e4 LT |
2113 | /* |
2114 | * Write info of quota file to disk | |
2115 | */ | |
2116 | int dquot_commit_info(struct super_block *sb, int type) | |
2117 | { | |
1da177e4 LT |
2118 | struct quota_info *dqopt = sb_dqopt(sb); |
2119 | ||
9a8ae30e | 2120 | return dqopt->ops[type]->write_file_info(sb, type); |
1da177e4 | 2121 | } |
08d0350c | 2122 | EXPORT_SYMBOL(dquot_commit_info); |
1da177e4 | 2123 | |
be6257b2 JK |
2124 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid) |
2125 | { | |
2126 | struct quota_info *dqopt = sb_dqopt(sb); | |
be6257b2 | 2127 | |
9d1ccbe7 JK |
2128 | if (!sb_has_quota_active(sb, qid->type)) |
2129 | return -ESRCH; | |
2130 | if (!dqopt->ops[qid->type]->get_next_id) | |
2131 | return -ENOSYS; | |
f14618c6 | 2132 | return dqopt->ops[qid->type]->get_next_id(sb, qid); |
be6257b2 JK |
2133 | } |
2134 | EXPORT_SYMBOL(dquot_get_next_id); | |
2135 | ||
1da177e4 LT |
2136 | /* |
2137 | * Definitions of diskquota operations. | |
2138 | */ | |
61e225dc | 2139 | const struct dquot_operations dquot_operations = { |
1da177e4 LT |
2140 | .write_dquot = dquot_commit, |
2141 | .acquire_dquot = dquot_acquire, | |
2142 | .release_dquot = dquot_release, | |
2143 | .mark_dirty = dquot_mark_dquot_dirty, | |
74f783af JK |
2144 | .write_info = dquot_commit_info, |
2145 | .alloc_dquot = dquot_alloc, | |
2146 | .destroy_dquot = dquot_destroy, | |
be6257b2 | 2147 | .get_next_id = dquot_get_next_id, |
1da177e4 | 2148 | }; |
123e9caf | 2149 | EXPORT_SYMBOL(dquot_operations); |
1da177e4 | 2150 | |
907f4554 CH |
2151 | /* |
2152 | * Generic helper for ->open on filesystems supporting disk quotas. | |
2153 | */ | |
2154 | int dquot_file_open(struct inode *inode, struct file *file) | |
2155 | { | |
2156 | int error; | |
2157 | ||
2158 | error = generic_file_open(inode, file); | |
2159 | if (!error && (file->f_mode & FMODE_WRITE)) | |
88d8ff97 | 2160 | error = dquot_initialize(inode); |
907f4554 CH |
2161 | return error; |
2162 | } | |
2163 | EXPORT_SYMBOL(dquot_file_open); | |
2164 | ||
1da177e4 LT |
2165 | /* |
2166 | * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) | |
2167 | */ | |
0f0dd62f | 2168 | int dquot_disable(struct super_block *sb, int type, unsigned int flags) |
1da177e4 | 2169 | { |
0ff5af83 | 2170 | int cnt, ret = 0; |
1da177e4 LT |
2171 | struct quota_info *dqopt = sb_dqopt(sb); |
2172 | struct inode *toputinode[MAXQUOTAS]; | |
1da177e4 | 2173 | |
7d6cd73d JK |
2174 | /* s_umount should be held in exclusive mode */ |
2175 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2176 | up_read(&sb->s_umount); | |
2177 | ||
f55abc0f JK |
2178 | /* Cannot turn off usage accounting without turning off limits, or |
2179 | * suspend quotas and simultaneously turn quotas off. */ | |
2180 | if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) | |
2181 | || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | | |
2182 | DQUOT_USAGE_ENABLED))) | |
2183 | return -EINVAL; | |
2184 | ||
9377abd0 JK |
2185 | /* |
2186 | * Skip everything if there's nothing to do. We have to do this because | |
2187 | * sometimes we are called when fill_super() failed and calling | |
2188 | * sync_fs() in such cases does no good. | |
2189 | */ | |
c3b00446 | 2190 | if (!sb_any_quota_loaded(sb)) |
9377abd0 | 2191 | return 0; |
c3b00446 | 2192 | |
1da177e4 LT |
2193 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2194 | toputinode[cnt] = NULL; | |
1da177e4 LT |
2195 | if (type != -1 && cnt != type) |
2196 | continue; | |
f55abc0f | 2197 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2198 | continue; |
f55abc0f JK |
2199 | |
2200 | if (flags & DQUOT_SUSPENDED) { | |
cc33412f | 2201 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2202 | dqopt->flags |= |
2203 | dquot_state_flag(DQUOT_SUSPENDED, cnt); | |
cc33412f | 2204 | spin_unlock(&dq_state_lock); |
f55abc0f | 2205 | } else { |
cc33412f | 2206 | spin_lock(&dq_state_lock); |
f55abc0f JK |
2207 | dqopt->flags &= ~dquot_state_flag(flags, cnt); |
2208 | /* Turning off suspended quotas? */ | |
2209 | if (!sb_has_quota_loaded(sb, cnt) && | |
2210 | sb_has_quota_suspended(sb, cnt)) { | |
2211 | dqopt->flags &= ~dquot_state_flag( | |
2212 | DQUOT_SUSPENDED, cnt); | |
cc33412f | 2213 | spin_unlock(&dq_state_lock); |
f55abc0f JK |
2214 | iput(dqopt->files[cnt]); |
2215 | dqopt->files[cnt] = NULL; | |
2216 | continue; | |
2217 | } | |
cc33412f | 2218 | spin_unlock(&dq_state_lock); |
0ff5af83 | 2219 | } |
f55abc0f JK |
2220 | |
2221 | /* We still have to keep quota loaded? */ | |
2222 | if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) | |
1da177e4 | 2223 | continue; |
1da177e4 LT |
2224 | |
2225 | /* Note: these are blocking operations */ | |
2226 | drop_dquot_ref(sb, cnt); | |
2227 | invalidate_dquots(sb, cnt); | |
2228 | /* | |
268157ba JK |
2229 | * Now all dquots should be invalidated, all writes done so we |
2230 | * should be only users of the info. No locks needed. | |
1da177e4 LT |
2231 | */ |
2232 | if (info_dirty(&dqopt->info[cnt])) | |
2233 | sb->dq_op->write_info(sb, cnt); | |
2234 | if (dqopt->ops[cnt]->free_file_info) | |
2235 | dqopt->ops[cnt]->free_file_info(sb, cnt); | |
2236 | put_quota_format(dqopt->info[cnt].dqi_format); | |
2237 | ||
2238 | toputinode[cnt] = dqopt->files[cnt]; | |
f55abc0f | 2239 | if (!sb_has_quota_loaded(sb, cnt)) |
0ff5af83 | 2240 | dqopt->files[cnt] = NULL; |
1da177e4 LT |
2241 | dqopt->info[cnt].dqi_flags = 0; |
2242 | dqopt->info[cnt].dqi_igrace = 0; | |
2243 | dqopt->info[cnt].dqi_bgrace = 0; | |
2244 | dqopt->ops[cnt] = NULL; | |
2245 | } | |
ca785ec6 JK |
2246 | |
2247 | /* Skip syncing and setting flags if quota files are hidden */ | |
2248 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) | |
2249 | goto put_inodes; | |
2250 | ||
1da177e4 | 2251 | /* Sync the superblock so that buffers with quota data are written to |
7b7b1ace | 2252 | * disk (and so userspace sees correct data afterwards). */ |
1da177e4 LT |
2253 | if (sb->s_op->sync_fs) |
2254 | sb->s_op->sync_fs(sb, 1); | |
2255 | sync_blockdev(sb->s_bdev); | |
2256 | /* Now the quota files are just ordinary files and we can set the | |
2257 | * inode flags back. Moreover we discard the pagecache so that | |
2258 | * userspace sees the writes we did bypassing the pagecache. We | |
2259 | * must also discard the blockdev buffers so that we see the | |
2260 | * changes done by userspace on the next quotaon() */ | |
2261 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2700e606 JK |
2262 | /* This can happen when suspending quotas on remount-ro... */ |
2263 | if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { | |
c3b00446 | 2264 | inode_lock(toputinode[cnt]); |
aad6cde9 | 2265 | toputinode[cnt]->i_flags &= ~S_NOQUOTA; |
c3b00446 JK |
2266 | truncate_inode_pages(&toputinode[cnt]->i_data, 0); |
2267 | inode_unlock(toputinode[cnt]); | |
2268 | mark_inode_dirty_sync(toputinode[cnt]); | |
ca785ec6 JK |
2269 | } |
2270 | if (sb->s_bdev) | |
2271 | invalidate_bdev(sb->s_bdev); | |
2272 | put_inodes: | |
2273 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) | |
2274 | if (toputinode[cnt]) { | |
0ff5af83 | 2275 | /* On remount RO, we keep the inode pointer so that we |
f55abc0f JK |
2276 | * can reenable quota on the subsequent remount RW. We |
2277 | * have to check 'flags' variable and not use sb_has_ | |
2278 | * function because another quotaon / quotaoff could | |
2279 | * change global state before we got here. We refuse | |
2280 | * to suspend quotas when there is pending delete on | |
2281 | * the quota file... */ | |
2282 | if (!(flags & DQUOT_SUSPENDED)) | |
0ff5af83 JK |
2283 | iput(toputinode[cnt]); |
2284 | else if (!toputinode[cnt]->i_nlink) | |
2285 | ret = -EBUSY; | |
1da177e4 | 2286 | } |
0ff5af83 | 2287 | return ret; |
1da177e4 | 2288 | } |
0f0dd62f | 2289 | EXPORT_SYMBOL(dquot_disable); |
1da177e4 | 2290 | |
287a8095 | 2291 | int dquot_quota_off(struct super_block *sb, int type) |
f55abc0f | 2292 | { |
0f0dd62f CH |
2293 | return dquot_disable(sb, type, |
2294 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
f55abc0f | 2295 | } |
287a8095 | 2296 | EXPORT_SYMBOL(dquot_quota_off); |
0f0dd62f | 2297 | |
1da177e4 LT |
2298 | /* |
2299 | * Turn quotas on on a device | |
2300 | */ | |
2301 | ||
f55abc0f JK |
2302 | /* |
2303 | * Helper function to turn quotas on when we already have the inode of | |
2304 | * quota file and no quota information is loaded. | |
2305 | */ | |
2306 | static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, | |
2307 | unsigned int flags) | |
1da177e4 LT |
2308 | { |
2309 | struct quota_format_type *fmt = find_quota_format(format_id); | |
2310 | struct super_block *sb = inode->i_sb; | |
2311 | struct quota_info *dqopt = sb_dqopt(sb); | |
2312 | int error; | |
1da177e4 LT |
2313 | |
2314 | if (!fmt) | |
2315 | return -ESRCH; | |
2316 | if (!S_ISREG(inode->i_mode)) { | |
2317 | error = -EACCES; | |
2318 | goto out_fmt; | |
2319 | } | |
2320 | if (IS_RDONLY(inode)) { | |
2321 | error = -EROFS; | |
2322 | goto out_fmt; | |
2323 | } | |
847aac64 LX |
2324 | if (!sb->s_op->quota_write || !sb->s_op->quota_read || |
2325 | (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { | |
1da177e4 LT |
2326 | error = -EINVAL; |
2327 | goto out_fmt; | |
2328 | } | |
5c004828 EB |
2329 | /* Filesystems outside of init_user_ns not yet supported */ |
2330 | if (sb->s_user_ns != &init_user_ns) { | |
2331 | error = -EINVAL; | |
2332 | goto out_fmt; | |
2333 | } | |
f55abc0f JK |
2334 | /* Usage always has to be set... */ |
2335 | if (!(flags & DQUOT_USAGE_ENABLED)) { | |
2336 | error = -EINVAL; | |
2337 | goto out_fmt; | |
2338 | } | |
c3b00446 JK |
2339 | if (sb_has_quota_loaded(sb, type)) { |
2340 | error = -EBUSY; | |
2341 | goto out_fmt; | |
2342 | } | |
1da177e4 | 2343 | |
ca785ec6 | 2344 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { |
ab94c39b JK |
2345 | /* As we bypass the pagecache we must now flush all the |
2346 | * dirty data and invalidate caches so that kernel sees | |
2347 | * changes from userspace. It is not enough to just flush | |
2348 | * the quota file since if blocksize < pagesize, invalidation | |
2349 | * of the cache could fail because of other unrelated dirty | |
2350 | * data */ | |
2351 | sync_filesystem(sb); | |
ca785ec6 JK |
2352 | invalidate_bdev(sb->s_bdev); |
2353 | } | |
ca785ec6 JK |
2354 | |
2355 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { | |
2356 | /* We don't want quota and atime on quota files (deadlocks | |
2357 | * possible) Also nobody should write to the file - we use | |
2358 | * special IO operations which ignore the immutable bit. */ | |
5955102c | 2359 | inode_lock(inode); |
aad6cde9 | 2360 | inode->i_flags |= S_NOQUOTA; |
5955102c | 2361 | inode_unlock(inode); |
26245c94 JK |
2362 | /* |
2363 | * When S_NOQUOTA is set, remove dquot references as no more | |
2364 | * references can be added | |
2365 | */ | |
9f754758 | 2366 | __dquot_drop(inode); |
ca785ec6 | 2367 | } |
1da177e4 LT |
2368 | |
2369 | error = -EIO; | |
2370 | dqopt->files[type] = igrab(inode); | |
2371 | if (!dqopt->files[type]) | |
c3b00446 | 2372 | goto out_file_flags; |
1da177e4 LT |
2373 | error = -EINVAL; |
2374 | if (!fmt->qf_ops->check_quota_file(sb, type)) | |
2375 | goto out_file_init; | |
2376 | ||
2377 | dqopt->ops[type] = fmt->qf_ops; | |
2378 | dqopt->info[type].dqi_format = fmt; | |
0ff5af83 | 2379 | dqopt->info[type].dqi_fmt_id = format_id; |
1da177e4 | 2380 | INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); |
268157ba | 2381 | error = dqopt->ops[type]->read_file_info(sb, type); |
42fdb858 | 2382 | if (error < 0) |
1da177e4 | 2383 | goto out_file_init; |
15512377 JK |
2384 | if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { |
2385 | spin_lock(&dq_data_lock); | |
46fe44ce | 2386 | dqopt->info[type].dqi_flags |= DQF_SYS_FILE; |
15512377 JK |
2387 | spin_unlock(&dq_data_lock); |
2388 | } | |
cc33412f | 2389 | spin_lock(&dq_state_lock); |
f55abc0f | 2390 | dqopt->flags |= dquot_state_flag(flags, type); |
cc33412f | 2391 | spin_unlock(&dq_state_lock); |
1da177e4 | 2392 | |
1a6152d3 CY |
2393 | error = add_dquot_ref(sb, type); |
2394 | if (error) | |
2395 | dquot_disable(sb, type, flags); | |
1da177e4 | 2396 | |
1a6152d3 | 2397 | return error; |
1da177e4 LT |
2398 | out_file_init: |
2399 | dqopt->files[type] = NULL; | |
2400 | iput(inode); | |
c3b00446 | 2401 | out_file_flags: |
aad6cde9 JK |
2402 | inode_lock(inode); |
2403 | inode->i_flags &= ~S_NOQUOTA; | |
2404 | inode_unlock(inode); | |
1da177e4 LT |
2405 | out_fmt: |
2406 | put_quota_format(fmt); | |
2407 | ||
27942ef5 | 2408 | return error; |
1da177e4 LT |
2409 | } |
2410 | ||
0ff5af83 | 2411 | /* Reenable quotas on remount RW */ |
0f0dd62f | 2412 | int dquot_resume(struct super_block *sb, int type) |
0ff5af83 JK |
2413 | { |
2414 | struct quota_info *dqopt = sb_dqopt(sb); | |
2415 | struct inode *inode; | |
0f0dd62f | 2416 | int ret = 0, cnt; |
f55abc0f | 2417 | unsigned int flags; |
0ff5af83 | 2418 | |
7d6cd73d JK |
2419 | /* s_umount should be held in exclusive mode */ |
2420 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2421 | up_read(&sb->s_umount); | |
2422 | ||
0f0dd62f CH |
2423 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
2424 | if (type != -1 && cnt != type) | |
2425 | continue; | |
c3b00446 | 2426 | if (!sb_has_quota_suspended(sb, cnt)) |
0f0dd62f | 2427 | continue; |
c3b00446 | 2428 | |
0f0dd62f CH |
2429 | inode = dqopt->files[cnt]; |
2430 | dqopt->files[cnt] = NULL; | |
2431 | spin_lock(&dq_state_lock); | |
2432 | flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | | |
2433 | DQUOT_LIMITS_ENABLED, | |
2434 | cnt); | |
2435 | dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); | |
2436 | spin_unlock(&dq_state_lock); | |
0ff5af83 | 2437 | |
0f0dd62f CH |
2438 | flags = dquot_generic_flag(flags, cnt); |
2439 | ret = vfs_load_quota_inode(inode, cnt, | |
2440 | dqopt->info[cnt].dqi_fmt_id, flags); | |
2441 | iput(inode); | |
2442 | } | |
0ff5af83 JK |
2443 | |
2444 | return ret; | |
2445 | } | |
0f0dd62f | 2446 | EXPORT_SYMBOL(dquot_resume); |
0ff5af83 | 2447 | |
f00c9e44 | 2448 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
8c54ca9c | 2449 | const struct path *path) |
77e69dac AV |
2450 | { |
2451 | int error = security_quota_on(path->dentry); | |
2452 | if (error) | |
2453 | return error; | |
2454 | /* Quota file not on the same filesystem? */ | |
d8c9584e | 2455 | if (path->dentry->d_sb != sb) |
77e69dac AV |
2456 | error = -EXDEV; |
2457 | else | |
dea655c2 | 2458 | error = vfs_load_quota_inode(d_inode(path->dentry), type, |
f55abc0f JK |
2459 | format_id, DQUOT_USAGE_ENABLED | |
2460 | DQUOT_LIMITS_ENABLED); | |
77e69dac AV |
2461 | return error; |
2462 | } | |
287a8095 | 2463 | EXPORT_SYMBOL(dquot_quota_on); |
1da177e4 | 2464 | |
f55abc0f JK |
2465 | /* |
2466 | * More powerful function for turning on quotas allowing setting | |
2467 | * of individual quota flags | |
2468 | */ | |
287a8095 CH |
2469 | int dquot_enable(struct inode *inode, int type, int format_id, |
2470 | unsigned int flags) | |
f55abc0f | 2471 | { |
f55abc0f | 2472 | struct super_block *sb = inode->i_sb; |
f55abc0f JK |
2473 | |
2474 | /* Just unsuspend quotas? */ | |
0f0dd62f | 2475 | BUG_ON(flags & DQUOT_SUSPENDED); |
7d6cd73d JK |
2476 | /* s_umount should be held in exclusive mode */ |
2477 | if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) | |
2478 | up_read(&sb->s_umount); | |
0f0dd62f | 2479 | |
f55abc0f JK |
2480 | if (!flags) |
2481 | return 0; | |
2482 | /* Just updating flags needed? */ | |
2483 | if (sb_has_quota_loaded(sb, type)) { | |
f55abc0f | 2484 | if (flags & DQUOT_USAGE_ENABLED && |
c3b00446 JK |
2485 | sb_has_quota_usage_enabled(sb, type)) |
2486 | return -EBUSY; | |
f55abc0f | 2487 | if (flags & DQUOT_LIMITS_ENABLED && |
c3b00446 JK |
2488 | sb_has_quota_limits_enabled(sb, type)) |
2489 | return -EBUSY; | |
cc33412f | 2490 | spin_lock(&dq_state_lock); |
f55abc0f | 2491 | sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); |
cc33412f | 2492 | spin_unlock(&dq_state_lock); |
c3b00446 | 2493 | return 0; |
f55abc0f JK |
2494 | } |
2495 | ||
f55abc0f JK |
2496 | return vfs_load_quota_inode(inode, type, format_id, flags); |
2497 | } | |
287a8095 | 2498 | EXPORT_SYMBOL(dquot_enable); |
f55abc0f | 2499 | |
1da177e4 LT |
2500 | /* |
2501 | * This function is used when filesystem needs to initialize quotas | |
2502 | * during mount time. | |
2503 | */ | |
287a8095 | 2504 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
84de856e | 2505 | int format_id, int type) |
1da177e4 | 2506 | { |
84de856e | 2507 | struct dentry *dentry; |
1da177e4 LT |
2508 | int error; |
2509 | ||
e12a4e8a | 2510 | dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); |
84de856e CH |
2511 | if (IS_ERR(dentry)) |
2512 | return PTR_ERR(dentry); | |
2513 | ||
dea655c2 | 2514 | if (d_really_is_negative(dentry)) { |
154f484b JK |
2515 | error = -ENOENT; |
2516 | goto out; | |
2517 | } | |
2518 | ||
1da177e4 | 2519 | error = security_quota_on(dentry); |
84de856e | 2520 | if (!error) |
dea655c2 | 2521 | error = vfs_load_quota_inode(d_inode(dentry), type, format_id, |
f55abc0f | 2522 | DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
84de856e | 2523 | |
154f484b | 2524 | out: |
84de856e CH |
2525 | dput(dentry); |
2526 | return error; | |
1da177e4 | 2527 | } |
287a8095 | 2528 | EXPORT_SYMBOL(dquot_quota_on_mount); |
b85f4b87 | 2529 | |
3e2af67e JK |
2530 | static int dquot_quota_enable(struct super_block *sb, unsigned int flags) |
2531 | { | |
2532 | int ret; | |
2533 | int type; | |
2534 | struct quota_info *dqopt = sb_dqopt(sb); | |
2535 | ||
2536 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2537 | return -ENOSYS; | |
2538 | /* Accounting cannot be turned on while fs is mounted */ | |
2539 | flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); | |
2540 | if (!flags) | |
2541 | return -EINVAL; | |
2542 | for (type = 0; type < MAXQUOTAS; type++) { | |
2543 | if (!(flags & qtype_enforce_flag(type))) | |
2544 | continue; | |
2545 | /* Can't enforce without accounting */ | |
2546 | if (!sb_has_quota_usage_enabled(sb, type)) | |
2547 | return -EINVAL; | |
2548 | ret = dquot_enable(dqopt->files[type], type, | |
2549 | dqopt->info[type].dqi_fmt_id, | |
2550 | DQUOT_LIMITS_ENABLED); | |
2551 | if (ret < 0) | |
2552 | goto out_err; | |
2553 | } | |
2554 | return 0; | |
2555 | out_err: | |
2556 | /* Backout enforcement enablement we already did */ | |
2557 | for (type--; type >= 0; type--) { | |
2558 | if (flags & qtype_enforce_flag(type)) | |
2559 | dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2560 | } | |
2561 | /* Error code translation for better compatibility with XFS */ | |
2562 | if (ret == -EBUSY) | |
2563 | ret = -EEXIST; | |
2564 | return ret; | |
2565 | } | |
2566 | ||
2567 | static int dquot_quota_disable(struct super_block *sb, unsigned int flags) | |
2568 | { | |
2569 | int ret; | |
2570 | int type; | |
2571 | struct quota_info *dqopt = sb_dqopt(sb); | |
2572 | ||
2573 | if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) | |
2574 | return -ENOSYS; | |
2575 | /* | |
2576 | * We don't support turning off accounting via quotactl. In principle | |
2577 | * quota infrastructure can do this but filesystems don't expect | |
2578 | * userspace to be able to do it. | |
2579 | */ | |
2580 | if (flags & | |
2581 | (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) | |
2582 | return -EOPNOTSUPP; | |
2583 | ||
2584 | /* Filter out limits not enabled */ | |
2585 | for (type = 0; type < MAXQUOTAS; type++) | |
2586 | if (!sb_has_quota_limits_enabled(sb, type)) | |
2587 | flags &= ~qtype_enforce_flag(type); | |
2588 | /* Nothing left? */ | |
2589 | if (!flags) | |
2590 | return -EEXIST; | |
2591 | for (type = 0; type < MAXQUOTAS; type++) { | |
2592 | if (flags & qtype_enforce_flag(type)) { | |
2593 | ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); | |
2594 | if (ret < 0) | |
2595 | goto out_err; | |
2596 | } | |
2597 | } | |
2598 | return 0; | |
2599 | out_err: | |
2600 | /* Backout enforcement disabling we already did */ | |
2601 | for (type--; type >= 0; type--) { | |
2602 | if (flags & qtype_enforce_flag(type)) | |
2603 | dquot_enable(dqopt->files[type], type, | |
2604 | dqopt->info[type].dqi_fmt_id, | |
2605 | DQUOT_LIMITS_ENABLED); | |
2606 | } | |
2607 | return ret; | |
2608 | } | |
2609 | ||
1da177e4 | 2610 | /* Generic routine for getting common part of quota structure */ |
14bf61ff | 2611 | static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2612 | { |
2613 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2614 | ||
b9b2dd36 | 2615 | memset(di, 0, sizeof(*di)); |
7b9ca4c6 | 2616 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2617 | di->d_spc_hardlimit = dm->dqb_bhardlimit; |
2618 | di->d_spc_softlimit = dm->dqb_bsoftlimit; | |
b9b2dd36 CH |
2619 | di->d_ino_hardlimit = dm->dqb_ihardlimit; |
2620 | di->d_ino_softlimit = dm->dqb_isoftlimit; | |
14bf61ff JK |
2621 | di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; |
2622 | di->d_ino_count = dm->dqb_curinodes; | |
2623 | di->d_spc_timer = dm->dqb_btime; | |
2624 | di->d_ino_timer = dm->dqb_itime; | |
7b9ca4c6 | 2625 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 LT |
2626 | } |
2627 | ||
74a8a103 | 2628 | int dquot_get_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2629 | struct qc_dqblk *di) |
1da177e4 LT |
2630 | { |
2631 | struct dquot *dquot; | |
2632 | ||
aca645a6 | 2633 | dquot = dqget(sb, qid); |
6184fc0b JK |
2634 | if (IS_ERR(dquot)) |
2635 | return PTR_ERR(dquot); | |
1da177e4 LT |
2636 | do_get_dqblk(dquot, di); |
2637 | dqput(dquot); | |
cc33412f | 2638 | |
1da177e4 LT |
2639 | return 0; |
2640 | } | |
287a8095 | 2641 | EXPORT_SYMBOL(dquot_get_dqblk); |
1da177e4 | 2642 | |
be6257b2 JK |
2643 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, |
2644 | struct qc_dqblk *di) | |
2645 | { | |
2646 | struct dquot *dquot; | |
2647 | int err; | |
2648 | ||
2649 | if (!sb->dq_op->get_next_id) | |
2650 | return -ENOSYS; | |
2651 | err = sb->dq_op->get_next_id(sb, qid); | |
2652 | if (err < 0) | |
2653 | return err; | |
2654 | dquot = dqget(sb, *qid); | |
2655 | if (IS_ERR(dquot)) | |
2656 | return PTR_ERR(dquot); | |
2657 | do_get_dqblk(dquot, di); | |
2658 | dqput(dquot); | |
2659 | ||
2660 | return 0; | |
2661 | } | |
2662 | EXPORT_SYMBOL(dquot_get_next_dqblk); | |
2663 | ||
14bf61ff JK |
2664 | #define VFS_QC_MASK \ |
2665 | (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ | |
2666 | QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ | |
2667 | QC_SPC_TIMER | QC_INO_TIMER) | |
c472b432 | 2668 | |
1da177e4 | 2669 | /* Generic routine for setting common part of quota structure */ |
14bf61ff | 2670 | static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) |
1da177e4 LT |
2671 | { |
2672 | struct mem_dqblk *dm = &dquot->dq_dqb; | |
2673 | int check_blim = 0, check_ilim = 0; | |
4c376dca | 2674 | struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; |
338bf9af | 2675 | |
14bf61ff | 2676 | if (di->d_fieldmask & ~VFS_QC_MASK) |
c472b432 CH |
2677 | return -EINVAL; |
2678 | ||
14bf61ff | 2679 | if (((di->d_fieldmask & QC_SPC_SOFT) && |
b10a0819 | 2680 | di->d_spc_softlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2681 | ((di->d_fieldmask & QC_SPC_HARD) && |
b10a0819 | 2682 | di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || |
14bf61ff | 2683 | ((di->d_fieldmask & QC_INO_SOFT) && |
b10a0819 | 2684 | (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || |
14bf61ff | 2685 | ((di->d_fieldmask & QC_INO_HARD) && |
b10a0819 | 2686 | (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) |
338bf9af | 2687 | return -ERANGE; |
1da177e4 | 2688 | |
7b9ca4c6 | 2689 | spin_lock(&dquot->dq_dqb_lock); |
14bf61ff JK |
2690 | if (di->d_fieldmask & QC_SPACE) { |
2691 | dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; | |
1da177e4 | 2692 | check_blim = 1; |
08261673 | 2693 | set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
1da177e4 | 2694 | } |
c472b432 | 2695 | |
14bf61ff JK |
2696 | if (di->d_fieldmask & QC_SPC_SOFT) |
2697 | dm->dqb_bsoftlimit = di->d_spc_softlimit; | |
2698 | if (di->d_fieldmask & QC_SPC_HARD) | |
2699 | dm->dqb_bhardlimit = di->d_spc_hardlimit; | |
2700 | if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { | |
1da177e4 | 2701 | check_blim = 1; |
08261673 | 2702 | set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
1da177e4 | 2703 | } |
c472b432 | 2704 | |
14bf61ff JK |
2705 | if (di->d_fieldmask & QC_INO_COUNT) { |
2706 | dm->dqb_curinodes = di->d_ino_count; | |
1da177e4 | 2707 | check_ilim = 1; |
08261673 | 2708 | set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
1da177e4 | 2709 | } |
c472b432 | 2710 | |
14bf61ff | 2711 | if (di->d_fieldmask & QC_INO_SOFT) |
c472b432 | 2712 | dm->dqb_isoftlimit = di->d_ino_softlimit; |
14bf61ff | 2713 | if (di->d_fieldmask & QC_INO_HARD) |
c472b432 | 2714 | dm->dqb_ihardlimit = di->d_ino_hardlimit; |
14bf61ff | 2715 | if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { |
1da177e4 | 2716 | check_ilim = 1; |
08261673 | 2717 | set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
1da177e4 | 2718 | } |
c472b432 | 2719 | |
14bf61ff JK |
2720 | if (di->d_fieldmask & QC_SPC_TIMER) { |
2721 | dm->dqb_btime = di->d_spc_timer; | |
e04a88a9 | 2722 | check_blim = 1; |
08261673 | 2723 | set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
4d59bce4 | 2724 | } |
c472b432 | 2725 | |
14bf61ff JK |
2726 | if (di->d_fieldmask & QC_INO_TIMER) { |
2727 | dm->dqb_itime = di->d_ino_timer; | |
e04a88a9 | 2728 | check_ilim = 1; |
08261673 | 2729 | set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
4d59bce4 | 2730 | } |
1da177e4 LT |
2731 | |
2732 | if (check_blim) { | |
268157ba | 2733 | if (!dm->dqb_bsoftlimit || |
41e327b5 | 2734 | dm->dqb_curspace + dm->dqb_rsvspace < dm->dqb_bsoftlimit) { |
1da177e4 LT |
2735 | dm->dqb_btime = 0; |
2736 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); | |
14bf61ff | 2737 | } else if (!(di->d_fieldmask & QC_SPC_TIMER)) |
268157ba | 2738 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2739 | dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; |
1da177e4 LT |
2740 | } |
2741 | if (check_ilim) { | |
268157ba JK |
2742 | if (!dm->dqb_isoftlimit || |
2743 | dm->dqb_curinodes < dm->dqb_isoftlimit) { | |
1da177e4 LT |
2744 | dm->dqb_itime = 0; |
2745 | clear_bit(DQ_INODES_B, &dquot->dq_flags); | |
14bf61ff | 2746 | } else if (!(di->d_fieldmask & QC_INO_TIMER)) |
268157ba | 2747 | /* Set grace only if user hasn't provided his own... */ |
e008bb61 | 2748 | dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; |
1da177e4 | 2749 | } |
268157ba JK |
2750 | if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || |
2751 | dm->dqb_isoftlimit) | |
1da177e4 LT |
2752 | clear_bit(DQ_FAKE_B, &dquot->dq_flags); |
2753 | else | |
2754 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
7b9ca4c6 | 2755 | spin_unlock(&dquot->dq_dqb_lock); |
1da177e4 | 2756 | mark_dquot_dirty(dquot); |
338bf9af AP |
2757 | |
2758 | return 0; | |
1da177e4 LT |
2759 | } |
2760 | ||
74a8a103 | 2761 | int dquot_set_dqblk(struct super_block *sb, struct kqid qid, |
14bf61ff | 2762 | struct qc_dqblk *di) |
1da177e4 LT |
2763 | { |
2764 | struct dquot *dquot; | |
338bf9af | 2765 | int rc; |
1da177e4 | 2766 | |
aca645a6 | 2767 | dquot = dqget(sb, qid); |
6184fc0b JK |
2768 | if (IS_ERR(dquot)) { |
2769 | rc = PTR_ERR(dquot); | |
f55abc0f | 2770 | goto out; |
1da177e4 | 2771 | } |
338bf9af | 2772 | rc = do_set_dqblk(dquot, di); |
1da177e4 | 2773 | dqput(dquot); |
f55abc0f | 2774 | out: |
338bf9af | 2775 | return rc; |
1da177e4 | 2776 | } |
287a8095 | 2777 | EXPORT_SYMBOL(dquot_set_dqblk); |
1da177e4 LT |
2778 | |
2779 | /* Generic routine for getting common part of quota file information */ | |
0a240339 | 2780 | int dquot_get_state(struct super_block *sb, struct qc_state *state) |
1da177e4 LT |
2781 | { |
2782 | struct mem_dqinfo *mi; | |
0a240339 JK |
2783 | struct qc_type_state *tstate; |
2784 | struct quota_info *dqopt = sb_dqopt(sb); | |
2785 | int type; | |
27942ef5 | 2786 | |
0a240339 JK |
2787 | memset(state, 0, sizeof(*state)); |
2788 | for (type = 0; type < MAXQUOTAS; type++) { | |
2789 | if (!sb_has_quota_active(sb, type)) | |
2790 | continue; | |
2791 | tstate = state->s_state + type; | |
2792 | mi = sb_dqopt(sb)->info + type; | |
2793 | tstate->flags = QCI_ACCT_ENABLED; | |
2794 | spin_lock(&dq_data_lock); | |
2795 | if (mi->dqi_flags & DQF_SYS_FILE) | |
2796 | tstate->flags |= QCI_SYSFILE; | |
2797 | if (mi->dqi_flags & DQF_ROOT_SQUASH) | |
2798 | tstate->flags |= QCI_ROOT_SQUASH; | |
2799 | if (sb_has_quota_limits_enabled(sb, type)) | |
2800 | tstate->flags |= QCI_LIMITS_ENFORCED; | |
2801 | tstate->spc_timelimit = mi->dqi_bgrace; | |
2802 | tstate->ino_timelimit = mi->dqi_igrace; | |
2803 | tstate->ino = dqopt->files[type]->i_ino; | |
2804 | tstate->blocks = dqopt->files[type]->i_blocks; | |
2805 | tstate->nextents = 1; /* We don't know... */ | |
2806 | spin_unlock(&dq_data_lock); | |
1da177e4 | 2807 | } |
1da177e4 LT |
2808 | return 0; |
2809 | } | |
0a240339 | 2810 | EXPORT_SYMBOL(dquot_get_state); |
1da177e4 LT |
2811 | |
2812 | /* Generic routine for setting common part of quota file information */ | |
5eacb2ac | 2813 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) |
1da177e4 LT |
2814 | { |
2815 | struct mem_dqinfo *mi; | |
f55abc0f | 2816 | int err = 0; |
1da177e4 | 2817 | |
5eacb2ac JK |
2818 | if ((ii->i_fieldmask & QC_WARNS_MASK) || |
2819 | (ii->i_fieldmask & QC_RT_SPC_TIMER)) | |
2820 | return -EINVAL; | |
9d1ccbe7 JK |
2821 | if (!sb_has_quota_active(sb, type)) |
2822 | return -ESRCH; | |
1da177e4 | 2823 | mi = sb_dqopt(sb)->info + type; |
5eacb2ac JK |
2824 | if (ii->i_fieldmask & QC_FLAGS) { |
2825 | if ((ii->i_flags & QCI_ROOT_SQUASH && | |
9d1ccbe7 JK |
2826 | mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) |
2827 | return -EINVAL; | |
ca6cb091 | 2828 | } |
1da177e4 | 2829 | spin_lock(&dq_data_lock); |
5eacb2ac JK |
2830 | if (ii->i_fieldmask & QC_SPC_TIMER) |
2831 | mi->dqi_bgrace = ii->i_spc_timelimit; | |
2832 | if (ii->i_fieldmask & QC_INO_TIMER) | |
2833 | mi->dqi_igrace = ii->i_ino_timelimit; | |
2834 | if (ii->i_fieldmask & QC_FLAGS) { | |
2835 | if (ii->i_flags & QCI_ROOT_SQUASH) | |
2836 | mi->dqi_flags |= DQF_ROOT_SQUASH; | |
2837 | else | |
2838 | mi->dqi_flags &= ~DQF_ROOT_SQUASH; | |
2839 | } | |
1da177e4 LT |
2840 | spin_unlock(&dq_data_lock); |
2841 | mark_info_dirty(sb, type); | |
2842 | /* Force write to disk */ | |
2843 | sb->dq_op->write_info(sb, type); | |
f55abc0f | 2844 | return err; |
1da177e4 | 2845 | } |
287a8095 | 2846 | EXPORT_SYMBOL(dquot_set_dqinfo); |
1da177e4 | 2847 | |
3e2af67e JK |
2848 | const struct quotactl_ops dquot_quotactl_sysfile_ops = { |
2849 | .quota_enable = dquot_quota_enable, | |
2850 | .quota_disable = dquot_quota_disable, | |
2851 | .quota_sync = dquot_quota_sync, | |
0a240339 | 2852 | .get_state = dquot_get_state, |
3e2af67e JK |
2853 | .set_info = dquot_set_dqinfo, |
2854 | .get_dqblk = dquot_get_dqblk, | |
be6257b2 | 2855 | .get_nextdqblk = dquot_get_next_dqblk, |
3e2af67e JK |
2856 | .set_dqblk = dquot_set_dqblk |
2857 | }; | |
2858 | EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); | |
2859 | ||
dde95888 DM |
2860 | static int do_proc_dqstats(struct ctl_table *table, int write, |
2861 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2862 | { | |
dde95888 | 2863 | unsigned int type = (int *)table->data - dqstats.stat; |
f32764bd DM |
2864 | |
2865 | /* Update global table */ | |
2866 | dqstats.stat[type] = | |
2867 | percpu_counter_sum_positive(&dqstats.counter[type]); | |
dde95888 DM |
2868 | return proc_dointvec(table, write, buffer, lenp, ppos); |
2869 | } | |
2870 | ||
e628753b | 2871 | static struct ctl_table fs_dqstats_table[] = { |
1da177e4 | 2872 | { |
1da177e4 | 2873 | .procname = "lookups", |
dde95888 | 2874 | .data = &dqstats.stat[DQST_LOOKUPS], |
1da177e4 LT |
2875 | .maxlen = sizeof(int), |
2876 | .mode = 0444, | |
dde95888 | 2877 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2878 | }, |
2879 | { | |
1da177e4 | 2880 | .procname = "drops", |
dde95888 | 2881 | .data = &dqstats.stat[DQST_DROPS], |
1da177e4 LT |
2882 | .maxlen = sizeof(int), |
2883 | .mode = 0444, | |
dde95888 | 2884 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2885 | }, |
2886 | { | |
1da177e4 | 2887 | .procname = "reads", |
dde95888 | 2888 | .data = &dqstats.stat[DQST_READS], |
1da177e4 LT |
2889 | .maxlen = sizeof(int), |
2890 | .mode = 0444, | |
dde95888 | 2891 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2892 | }, |
2893 | { | |
1da177e4 | 2894 | .procname = "writes", |
dde95888 | 2895 | .data = &dqstats.stat[DQST_WRITES], |
1da177e4 LT |
2896 | .maxlen = sizeof(int), |
2897 | .mode = 0444, | |
dde95888 | 2898 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2899 | }, |
2900 | { | |
1da177e4 | 2901 | .procname = "cache_hits", |
dde95888 | 2902 | .data = &dqstats.stat[DQST_CACHE_HITS], |
1da177e4 LT |
2903 | .maxlen = sizeof(int), |
2904 | .mode = 0444, | |
dde95888 | 2905 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2906 | }, |
2907 | { | |
1da177e4 | 2908 | .procname = "allocated_dquots", |
dde95888 | 2909 | .data = &dqstats.stat[DQST_ALLOC_DQUOTS], |
1da177e4 LT |
2910 | .maxlen = sizeof(int), |
2911 | .mode = 0444, | |
dde95888 | 2912 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2913 | }, |
2914 | { | |
1da177e4 | 2915 | .procname = "free_dquots", |
dde95888 | 2916 | .data = &dqstats.stat[DQST_FREE_DQUOTS], |
1da177e4 LT |
2917 | .maxlen = sizeof(int), |
2918 | .mode = 0444, | |
dde95888 | 2919 | .proc_handler = do_proc_dqstats, |
1da177e4 LT |
2920 | }, |
2921 | { | |
1da177e4 | 2922 | .procname = "syncs", |
dde95888 | 2923 | .data = &dqstats.stat[DQST_SYNCS], |
1da177e4 LT |
2924 | .maxlen = sizeof(int), |
2925 | .mode = 0444, | |
dde95888 | 2926 | .proc_handler = do_proc_dqstats, |
1da177e4 | 2927 | }, |
8e893469 | 2928 | #ifdef CONFIG_PRINT_QUOTA_WARNING |
1da177e4 | 2929 | { |
1da177e4 LT |
2930 | .procname = "warnings", |
2931 | .data = &flag_print_warnings, | |
2932 | .maxlen = sizeof(int), | |
2933 | .mode = 0644, | |
6d456111 | 2934 | .proc_handler = proc_dointvec, |
1da177e4 | 2935 | }, |
8e893469 | 2936 | #endif |
ab09203e | 2937 | { }, |
1da177e4 LT |
2938 | }; |
2939 | ||
e628753b | 2940 | static struct ctl_table fs_table[] = { |
1da177e4 | 2941 | { |
1da177e4 LT |
2942 | .procname = "quota", |
2943 | .mode = 0555, | |
2944 | .child = fs_dqstats_table, | |
2945 | }, | |
ab09203e | 2946 | { }, |
1da177e4 LT |
2947 | }; |
2948 | ||
e628753b | 2949 | static struct ctl_table sys_table[] = { |
1da177e4 | 2950 | { |
1da177e4 LT |
2951 | .procname = "fs", |
2952 | .mode = 0555, | |
2953 | .child = fs_table, | |
2954 | }, | |
ab09203e | 2955 | { }, |
1da177e4 LT |
2956 | }; |
2957 | ||
2958 | static int __init dquot_init(void) | |
2959 | { | |
f32764bd | 2960 | int i, ret; |
1da177e4 LT |
2961 | unsigned long nr_hash, order; |
2962 | ||
2963 | printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); | |
2964 | ||
0b4d4147 | 2965 | register_sysctl_table(sys_table); |
1da177e4 | 2966 | |
20c2df83 | 2967 | dquot_cachep = kmem_cache_create("dquot", |
1da177e4 | 2968 | sizeof(struct dquot), sizeof(unsigned long) * 4, |
fffb60f9 PJ |
2969 | (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
2970 | SLAB_MEM_SPREAD|SLAB_PANIC), | |
20c2df83 | 2971 | NULL); |
1da177e4 LT |
2972 | |
2973 | order = 0; | |
1aa3b3e0 | 2974 | dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); |
1da177e4 LT |
2975 | if (!dquot_hash) |
2976 | panic("Cannot create dquot hash table"); | |
2977 | ||
f32764bd | 2978 | for (i = 0; i < _DQST_DQSTAT_LAST; i++) { |
908c7f19 | 2979 | ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); |
f32764bd DM |
2980 | if (ret) |
2981 | panic("Cannot create dquot stat counters"); | |
2982 | } | |
dde95888 | 2983 | |
1da177e4 LT |
2984 | /* Find power-of-two hlist_heads which can fit into allocation */ |
2985 | nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); | |
2986 | dq_hash_bits = 0; | |
2987 | do { | |
2988 | dq_hash_bits++; | |
2989 | } while (nr_hash >> dq_hash_bits); | |
2990 | dq_hash_bits--; | |
2991 | ||
2992 | nr_hash = 1UL << dq_hash_bits; | |
2993 | dq_hash_mask = nr_hash - 1; | |
2994 | for (i = 0; i < nr_hash; i++) | |
2995 | INIT_HLIST_HEAD(dquot_hash + i); | |
2996 | ||
19858e7b AB |
2997 | pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," |
2998 | " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); | |
1da177e4 | 2999 | |
88bc0ede TH |
3000 | if (register_shrinker(&dqcache_shrinker)) |
3001 | panic("Cannot register dquot shrinker"); | |
1da177e4 LT |
3002 | |
3003 | return 0; | |
3004 | } | |
331221fa | 3005 | fs_initcall(dquot_init); |