Commit | Line | Data |
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1da177e4 | 1 | /* |
4ce3121f NS |
2 | * Copyright (c) 2000-2003 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
4ce3121f NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
4ce3121f NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
4ce3121f NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 LT |
18 | #include "xfs.h" |
19 | #include "xfs_fs.h" | |
a844f451 | 20 | #include "xfs_bit.h" |
1da177e4 | 21 | #include "xfs_log.h" |
a844f451 | 22 | #include "xfs_inum.h" |
1da177e4 LT |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" | |
25 | #include "xfs_ag.h" | |
1da177e4 | 26 | #include "xfs_alloc.h" |
1da177e4 LT |
27 | #include "xfs_quota.h" |
28 | #include "xfs_mount.h" | |
1da177e4 | 29 | #include "xfs_bmap_btree.h" |
1da177e4 LT |
30 | #include "xfs_inode.h" |
31 | #include "xfs_bmap.h" | |
1da177e4 LT |
32 | #include "xfs_rtalloc.h" |
33 | #include "xfs_error.h" | |
34 | #include "xfs_itable.h" | |
1da177e4 LT |
35 | #include "xfs_attr.h" |
36 | #include "xfs_buf_item.h" | |
37 | #include "xfs_trans_space.h" | |
38 | #include "xfs_trans_priv.h" | |
1da177e4 | 39 | #include "xfs_qm.h" |
0b1b213f | 40 | #include "xfs_trace.h" |
1da177e4 LT |
41 | |
42 | ||
43 | /* | |
44 | LOCK ORDER | |
45 | ||
46 | inode lock (ilock) | |
47 | dquot hash-chain lock (hashlock) | |
48 | xqm dquot freelist lock (freelistlock | |
49 | mount's dquot list lock (mplistlock) | |
50 | user dquot lock - lock ordering among dquots is based on the uid or gid | |
51 | group dquot lock - similar to udquots. Between the two dquots, the udquot | |
52 | has to be locked first. | |
53 | pin lock - the dquot lock must be held to take this lock. | |
54 | flush lock - ditto. | |
55 | */ | |
56 | ||
1da177e4 LT |
57 | #ifdef DEBUG |
58 | xfs_buftarg_t *xfs_dqerror_target; | |
59 | int xfs_do_dqerror; | |
60 | int xfs_dqreq_num; | |
61 | int xfs_dqerror_mod = 33; | |
62 | #endif | |
63 | ||
98b8c7a0 CH |
64 | static struct lock_class_key xfs_dquot_other_class; |
65 | ||
1da177e4 LT |
66 | /* |
67 | * Allocate and initialize a dquot. We don't always allocate fresh memory; | |
68 | * we try to reclaim a free dquot if the number of incore dquots are above | |
69 | * a threshold. | |
70 | * The only field inside the core that gets initialized at this point | |
71 | * is the d_id field. The idea is to fill in the entire q_core | |
72 | * when we read in the on disk dquot. | |
73 | */ | |
ba0f32d4 | 74 | STATIC xfs_dquot_t * |
1da177e4 LT |
75 | xfs_qm_dqinit( |
76 | xfs_mount_t *mp, | |
77 | xfs_dqid_t id, | |
78 | uint type) | |
79 | { | |
80 | xfs_dquot_t *dqp; | |
81 | boolean_t brandnewdquot; | |
82 | ||
83 | brandnewdquot = xfs_qm_dqalloc_incore(&dqp); | |
84 | dqp->dq_flags = type; | |
1149d96a | 85 | dqp->q_core.d_id = cpu_to_be32(id); |
1da177e4 LT |
86 | dqp->q_mount = mp; |
87 | ||
88 | /* | |
89 | * No need to re-initialize these if this is a reclaimed dquot. | |
90 | */ | |
91 | if (brandnewdquot) { | |
3a8406f6 | 92 | INIT_LIST_HEAD(&dqp->q_freelist); |
794ee1ba | 93 | mutex_init(&dqp->q_qlock); |
bc3048e3 | 94 | init_waitqueue_head(&dqp->q_pinwait); |
1da177e4 | 95 | |
e1f49cf2 DC |
96 | /* |
97 | * Because we want to use a counting completion, complete | |
98 | * the flush completion once to allow a single access to | |
99 | * the flush completion without blocking. | |
100 | */ | |
101 | init_completion(&dqp->q_flush); | |
102 | complete(&dqp->q_flush); | |
103 | ||
0b1b213f | 104 | trace_xfs_dqinit(dqp); |
1da177e4 LT |
105 | } else { |
106 | /* | |
107 | * Only the q_core portion was zeroed in dqreclaim_one(). | |
108 | * So, we need to reset others. | |
109 | */ | |
3a8406f6 DC |
110 | dqp->q_nrefs = 0; |
111 | dqp->q_blkno = 0; | |
112 | INIT_LIST_HEAD(&dqp->q_mplist); | |
113 | INIT_LIST_HEAD(&dqp->q_hashlist); | |
114 | dqp->q_bufoffset = 0; | |
115 | dqp->q_fileoffset = 0; | |
116 | dqp->q_transp = NULL; | |
117 | dqp->q_gdquot = NULL; | |
118 | dqp->q_res_bcount = 0; | |
119 | dqp->q_res_icount = 0; | |
120 | dqp->q_res_rtbcount = 0; | |
121 | atomic_set(&dqp->q_pincount, 0); | |
122 | dqp->q_hash = NULL; | |
123 | ASSERT(list_empty(&dqp->q_freelist)); | |
1da177e4 | 124 | |
0b1b213f | 125 | trace_xfs_dqreuse(dqp); |
98b8c7a0 CH |
126 | } |
127 | ||
128 | /* | |
129 | * In either case we need to make sure group quotas have a different | |
130 | * lock class than user quotas, to make sure lockdep knows we can | |
131 | * locks of one of each at the same time. | |
132 | */ | |
133 | if (!(type & XFS_DQ_USER)) | |
134 | lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class); | |
1da177e4 LT |
135 | |
136 | /* | |
137 | * log item gets initialized later | |
138 | */ | |
139 | return (dqp); | |
140 | } | |
141 | ||
142 | /* | |
143 | * This is called to free all the memory associated with a dquot | |
144 | */ | |
145 | void | |
146 | xfs_qm_dqdestroy( | |
147 | xfs_dquot_t *dqp) | |
148 | { | |
3a8406f6 | 149 | ASSERT(list_empty(&dqp->q_freelist)); |
1da177e4 LT |
150 | |
151 | mutex_destroy(&dqp->q_qlock); | |
1da177e4 | 152 | kmem_zone_free(xfs_Gqm->qm_dqzone, dqp); |
0b1b213f | 153 | |
1da177e4 LT |
154 | atomic_dec(&xfs_Gqm->qm_totaldquots); |
155 | } | |
156 | ||
157 | /* | |
158 | * This is what a 'fresh' dquot inside a dquot chunk looks like on disk. | |
159 | */ | |
160 | STATIC void | |
161 | xfs_qm_dqinit_core( | |
162 | xfs_dqid_t id, | |
163 | uint type, | |
164 | xfs_dqblk_t *d) | |
165 | { | |
166 | /* | |
167 | * Caller has zero'd the entire dquot 'chunk' already. | |
168 | */ | |
1149d96a CH |
169 | d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); |
170 | d->dd_diskdq.d_version = XFS_DQUOT_VERSION; | |
171 | d->dd_diskdq.d_id = cpu_to_be32(id); | |
172 | d->dd_diskdq.d_flags = type; | |
1da177e4 LT |
173 | } |
174 | ||
1da177e4 LT |
175 | /* |
176 | * If default limits are in force, push them into the dquot now. | |
177 | * We overwrite the dquot limits only if they are zero and this | |
178 | * is not the root dquot. | |
179 | */ | |
180 | void | |
181 | xfs_qm_adjust_dqlimits( | |
182 | xfs_mount_t *mp, | |
183 | xfs_disk_dquot_t *d) | |
184 | { | |
185 | xfs_quotainfo_t *q = mp->m_quotainfo; | |
186 | ||
187 | ASSERT(d->d_id); | |
188 | ||
189 | if (q->qi_bsoftlimit && !d->d_blk_softlimit) | |
1149d96a | 190 | d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit); |
1da177e4 | 191 | if (q->qi_bhardlimit && !d->d_blk_hardlimit) |
1149d96a | 192 | d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit); |
1da177e4 | 193 | if (q->qi_isoftlimit && !d->d_ino_softlimit) |
1149d96a | 194 | d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit); |
1da177e4 | 195 | if (q->qi_ihardlimit && !d->d_ino_hardlimit) |
1149d96a | 196 | d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit); |
1da177e4 | 197 | if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit) |
1149d96a | 198 | d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit); |
1da177e4 | 199 | if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit) |
1149d96a | 200 | d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit); |
1da177e4 LT |
201 | } |
202 | ||
203 | /* | |
204 | * Check the limits and timers of a dquot and start or reset timers | |
205 | * if necessary. | |
206 | * This gets called even when quota enforcement is OFF, which makes our | |
207 | * life a little less complicated. (We just don't reject any quota | |
208 | * reservations in that case, when enforcement is off). | |
209 | * We also return 0 as the values of the timers in Q_GETQUOTA calls, when | |
210 | * enforcement's off. | |
211 | * In contrast, warnings are a little different in that they don't | |
754002b4 NS |
212 | * 'automatically' get started when limits get exceeded. They do |
213 | * get reset to zero, however, when we find the count to be under | |
214 | * the soft limit (they are only ever set non-zero via userspace). | |
1da177e4 LT |
215 | */ |
216 | void | |
217 | xfs_qm_adjust_dqtimers( | |
218 | xfs_mount_t *mp, | |
219 | xfs_disk_dquot_t *d) | |
220 | { | |
221 | ASSERT(d->d_id); | |
222 | ||
ea15ab3c | 223 | #ifdef DEBUG |
1149d96a CH |
224 | if (d->d_blk_hardlimit) |
225 | ASSERT(be64_to_cpu(d->d_blk_softlimit) <= | |
226 | be64_to_cpu(d->d_blk_hardlimit)); | |
227 | if (d->d_ino_hardlimit) | |
228 | ASSERT(be64_to_cpu(d->d_ino_softlimit) <= | |
229 | be64_to_cpu(d->d_ino_hardlimit)); | |
230 | if (d->d_rtb_hardlimit) | |
231 | ASSERT(be64_to_cpu(d->d_rtb_softlimit) <= | |
232 | be64_to_cpu(d->d_rtb_hardlimit)); | |
1da177e4 | 233 | #endif |
ea15ab3c | 234 | |
1da177e4 | 235 | if (!d->d_btimer) { |
1149d96a CH |
236 | if ((d->d_blk_softlimit && |
237 | (be64_to_cpu(d->d_bcount) >= | |
238 | be64_to_cpu(d->d_blk_softlimit))) || | |
239 | (d->d_blk_hardlimit && | |
240 | (be64_to_cpu(d->d_bcount) >= | |
241 | be64_to_cpu(d->d_blk_hardlimit)))) { | |
242 | d->d_btimer = cpu_to_be32(get_seconds() + | |
8a7b8a89 | 243 | mp->m_quotainfo->qi_btimelimit); |
754002b4 NS |
244 | } else { |
245 | d->d_bwarns = 0; | |
1da177e4 LT |
246 | } |
247 | } else { | |
248 | if ((!d->d_blk_softlimit || | |
1149d96a CH |
249 | (be64_to_cpu(d->d_bcount) < |
250 | be64_to_cpu(d->d_blk_softlimit))) && | |
1da177e4 | 251 | (!d->d_blk_hardlimit || |
1149d96a CH |
252 | (be64_to_cpu(d->d_bcount) < |
253 | be64_to_cpu(d->d_blk_hardlimit)))) { | |
1da177e4 LT |
254 | d->d_btimer = 0; |
255 | } | |
256 | } | |
257 | ||
258 | if (!d->d_itimer) { | |
1149d96a CH |
259 | if ((d->d_ino_softlimit && |
260 | (be64_to_cpu(d->d_icount) >= | |
261 | be64_to_cpu(d->d_ino_softlimit))) || | |
262 | (d->d_ino_hardlimit && | |
263 | (be64_to_cpu(d->d_icount) >= | |
264 | be64_to_cpu(d->d_ino_hardlimit)))) { | |
265 | d->d_itimer = cpu_to_be32(get_seconds() + | |
8a7b8a89 | 266 | mp->m_quotainfo->qi_itimelimit); |
754002b4 NS |
267 | } else { |
268 | d->d_iwarns = 0; | |
1da177e4 LT |
269 | } |
270 | } else { | |
271 | if ((!d->d_ino_softlimit || | |
1149d96a CH |
272 | (be64_to_cpu(d->d_icount) < |
273 | be64_to_cpu(d->d_ino_softlimit))) && | |
1da177e4 | 274 | (!d->d_ino_hardlimit || |
1149d96a CH |
275 | (be64_to_cpu(d->d_icount) < |
276 | be64_to_cpu(d->d_ino_hardlimit)))) { | |
1da177e4 LT |
277 | d->d_itimer = 0; |
278 | } | |
279 | } | |
280 | ||
281 | if (!d->d_rtbtimer) { | |
1149d96a CH |
282 | if ((d->d_rtb_softlimit && |
283 | (be64_to_cpu(d->d_rtbcount) >= | |
284 | be64_to_cpu(d->d_rtb_softlimit))) || | |
285 | (d->d_rtb_hardlimit && | |
286 | (be64_to_cpu(d->d_rtbcount) >= | |
287 | be64_to_cpu(d->d_rtb_hardlimit)))) { | |
288 | d->d_rtbtimer = cpu_to_be32(get_seconds() + | |
8a7b8a89 | 289 | mp->m_quotainfo->qi_rtbtimelimit); |
754002b4 NS |
290 | } else { |
291 | d->d_rtbwarns = 0; | |
1da177e4 LT |
292 | } |
293 | } else { | |
294 | if ((!d->d_rtb_softlimit || | |
1149d96a CH |
295 | (be64_to_cpu(d->d_rtbcount) < |
296 | be64_to_cpu(d->d_rtb_softlimit))) && | |
1da177e4 | 297 | (!d->d_rtb_hardlimit || |
1149d96a CH |
298 | (be64_to_cpu(d->d_rtbcount) < |
299 | be64_to_cpu(d->d_rtb_hardlimit)))) { | |
1da177e4 LT |
300 | d->d_rtbtimer = 0; |
301 | } | |
302 | } | |
303 | } | |
304 | ||
1da177e4 LT |
305 | /* |
306 | * initialize a buffer full of dquots and log the whole thing | |
307 | */ | |
308 | STATIC void | |
309 | xfs_qm_init_dquot_blk( | |
310 | xfs_trans_t *tp, | |
311 | xfs_mount_t *mp, | |
312 | xfs_dqid_t id, | |
313 | uint type, | |
314 | xfs_buf_t *bp) | |
315 | { | |
8a7b8a89 | 316 | struct xfs_quotainfo *q = mp->m_quotainfo; |
1da177e4 LT |
317 | xfs_dqblk_t *d; |
318 | int curid, i; | |
319 | ||
320 | ASSERT(tp); | |
0c842ad4 | 321 | ASSERT(xfs_buf_islocked(bp)); |
1da177e4 | 322 | |
62926044 | 323 | d = bp->b_addr; |
1da177e4 LT |
324 | |
325 | /* | |
326 | * ID of the first dquot in the block - id's are zero based. | |
327 | */ | |
8a7b8a89 | 328 | curid = id - (id % q->qi_dqperchunk); |
1da177e4 | 329 | ASSERT(curid >= 0); |
8a7b8a89 CH |
330 | memset(d, 0, BBTOB(q->qi_dqchunklen)); |
331 | for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) | |
1da177e4 LT |
332 | xfs_qm_dqinit_core(curid, type, d); |
333 | xfs_trans_dquot_buf(tp, bp, | |
c1155410 DC |
334 | (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF : |
335 | ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF : | |
336 | XFS_BLF_GDQUOT_BUF))); | |
8a7b8a89 | 337 | xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1); |
1da177e4 LT |
338 | } |
339 | ||
340 | ||
341 | ||
342 | /* | |
343 | * Allocate a block and fill it with dquots. | |
344 | * This is called when the bmapi finds a hole. | |
345 | */ | |
346 | STATIC int | |
347 | xfs_qm_dqalloc( | |
efa092f3 | 348 | xfs_trans_t **tpp, |
1da177e4 LT |
349 | xfs_mount_t *mp, |
350 | xfs_dquot_t *dqp, | |
351 | xfs_inode_t *quotip, | |
352 | xfs_fileoff_t offset_fsb, | |
353 | xfs_buf_t **O_bpp) | |
354 | { | |
355 | xfs_fsblock_t firstblock; | |
356 | xfs_bmap_free_t flist; | |
357 | xfs_bmbt_irec_t map; | |
358 | int nmaps, error, committed; | |
359 | xfs_buf_t *bp; | |
efa092f3 | 360 | xfs_trans_t *tp = *tpp; |
1da177e4 LT |
361 | |
362 | ASSERT(tp != NULL); | |
0b1b213f CH |
363 | |
364 | trace_xfs_dqalloc(dqp); | |
1da177e4 LT |
365 | |
366 | /* | |
367 | * Initialize the bmap freelist prior to calling bmapi code. | |
368 | */ | |
9d87c319 | 369 | xfs_bmap_init(&flist, &firstblock); |
1da177e4 LT |
370 | xfs_ilock(quotip, XFS_ILOCK_EXCL); |
371 | /* | |
372 | * Return if this type of quotas is turned off while we didn't | |
373 | * have an inode lock | |
374 | */ | |
375 | if (XFS_IS_THIS_QUOTA_OFF(dqp)) { | |
376 | xfs_iunlock(quotip, XFS_ILOCK_EXCL); | |
377 | return (ESRCH); | |
378 | } | |
379 | ||
898621d5 | 380 | xfs_trans_ijoin_ref(tp, quotip, XFS_ILOCK_EXCL); |
1da177e4 LT |
381 | nmaps = 1; |
382 | if ((error = xfs_bmapi(tp, quotip, | |
383 | offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB, | |
384 | XFS_BMAPI_METADATA | XFS_BMAPI_WRITE, | |
385 | &firstblock, | |
386 | XFS_QM_DQALLOC_SPACE_RES(mp), | |
b4e9181e | 387 | &map, &nmaps, &flist))) { |
1da177e4 LT |
388 | goto error0; |
389 | } | |
390 | ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB); | |
391 | ASSERT(nmaps == 1); | |
392 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
393 | (map.br_startblock != HOLESTARTBLOCK)); | |
394 | ||
395 | /* | |
396 | * Keep track of the blkno to save a lookup later | |
397 | */ | |
398 | dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); | |
399 | ||
400 | /* now we can just get the buffer (there's nothing to read yet) */ | |
401 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, | |
402 | dqp->q_blkno, | |
8a7b8a89 | 403 | mp->m_quotainfo->qi_dqchunklen, |
1da177e4 | 404 | 0); |
2a30f36d CS |
405 | |
406 | error = xfs_buf_geterror(bp); | |
407 | if (error) | |
1da177e4 | 408 | goto error1; |
2a30f36d | 409 | |
1da177e4 LT |
410 | /* |
411 | * Make a chunk of dquots out of this buffer and log | |
412 | * the entire thing. | |
413 | */ | |
1149d96a | 414 | xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id), |
c8ad20ff | 415 | dqp->dq_flags & XFS_DQ_ALLTYPES, bp); |
1da177e4 | 416 | |
efa092f3 TS |
417 | /* |
418 | * xfs_bmap_finish() may commit the current transaction and | |
419 | * start a second transaction if the freelist is not empty. | |
420 | * | |
421 | * Since we still want to modify this buffer, we need to | |
422 | * ensure that the buffer is not released on commit of | |
423 | * the first transaction and ensure the buffer is added to the | |
424 | * second transaction. | |
425 | * | |
426 | * If there is only one transaction then don't stop the buffer | |
427 | * from being released when it commits later on. | |
428 | */ | |
429 | ||
430 | xfs_trans_bhold(tp, bp); | |
431 | ||
f7c99b6f | 432 | if ((error = xfs_bmap_finish(tpp, &flist, &committed))) { |
1da177e4 LT |
433 | goto error1; |
434 | } | |
435 | ||
efa092f3 TS |
436 | if (committed) { |
437 | tp = *tpp; | |
438 | xfs_trans_bjoin(tp, bp); | |
439 | } else { | |
440 | xfs_trans_bhold_release(tp, bp); | |
441 | } | |
442 | ||
1da177e4 LT |
443 | *O_bpp = bp; |
444 | return 0; | |
445 | ||
446 | error1: | |
447 | xfs_bmap_cancel(&flist); | |
448 | error0: | |
449 | xfs_iunlock(quotip, XFS_ILOCK_EXCL); | |
450 | ||
451 | return (error); | |
452 | } | |
453 | ||
454 | /* | |
455 | * Maps a dquot to the buffer containing its on-disk version. | |
456 | * This returns a ptr to the buffer containing the on-disk dquot | |
457 | * in the bpp param, and a ptr to the on-disk dquot within that buffer | |
458 | */ | |
459 | STATIC int | |
460 | xfs_qm_dqtobp( | |
efa092f3 | 461 | xfs_trans_t **tpp, |
1da177e4 LT |
462 | xfs_dquot_t *dqp, |
463 | xfs_disk_dquot_t **O_ddpp, | |
464 | xfs_buf_t **O_bpp, | |
465 | uint flags) | |
466 | { | |
467 | xfs_bmbt_irec_t map; | |
acecf1b5 | 468 | int nmaps = 1, error; |
1da177e4 | 469 | xfs_buf_t *bp; |
acecf1b5 CH |
470 | xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp); |
471 | xfs_mount_t *mp = dqp->q_mount; | |
1da177e4 | 472 | xfs_disk_dquot_t *ddq; |
acecf1b5 | 473 | xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); |
efa092f3 | 474 | xfs_trans_t *tp = (tpp ? *tpp : NULL); |
1da177e4 | 475 | |
acecf1b5 | 476 | dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; |
1da177e4 | 477 | |
acecf1b5 CH |
478 | xfs_ilock(quotip, XFS_ILOCK_SHARED); |
479 | if (XFS_IS_THIS_QUOTA_OFF(dqp)) { | |
1da177e4 | 480 | /* |
acecf1b5 CH |
481 | * Return if this type of quotas is turned off while we |
482 | * didn't have the quota inode lock. | |
1da177e4 | 483 | */ |
acecf1b5 CH |
484 | xfs_iunlock(quotip, XFS_ILOCK_SHARED); |
485 | return ESRCH; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Find the block map; no allocations yet | |
490 | */ | |
5c8ed202 DC |
491 | error = xfs_bmapi_read(quotip, dqp->q_fileoffset, |
492 | XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); | |
acecf1b5 CH |
493 | |
494 | xfs_iunlock(quotip, XFS_ILOCK_SHARED); | |
495 | if (error) | |
496 | return error; | |
497 | ||
498 | ASSERT(nmaps == 1); | |
499 | ASSERT(map.br_blockcount == 1); | |
500 | ||
501 | /* | |
502 | * Offset of dquot in the (fixed sized) dquot chunk. | |
503 | */ | |
504 | dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * | |
505 | sizeof(xfs_dqblk_t); | |
506 | ||
507 | ASSERT(map.br_startblock != DELAYSTARTBLOCK); | |
508 | if (map.br_startblock == HOLESTARTBLOCK) { | |
1da177e4 | 509 | /* |
acecf1b5 | 510 | * We don't allocate unless we're asked to |
1da177e4 | 511 | */ |
acecf1b5 CH |
512 | if (!(flags & XFS_QMOPT_DQALLOC)) |
513 | return ENOENT; | |
1da177e4 | 514 | |
acecf1b5 CH |
515 | ASSERT(tp); |
516 | error = xfs_qm_dqalloc(tpp, mp, dqp, quotip, | |
517 | dqp->q_fileoffset, &bp); | |
1da177e4 | 518 | if (error) |
acecf1b5 CH |
519 | return error; |
520 | tp = *tpp; | |
521 | } else { | |
522 | trace_xfs_dqtobp_read(dqp); | |
1da177e4 LT |
523 | |
524 | /* | |
acecf1b5 CH |
525 | * store the blkno etc so that we don't have to do the |
526 | * mapping all the time | |
1da177e4 | 527 | */ |
acecf1b5 | 528 | dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); |
0b1b213f | 529 | |
8a7b8a89 CH |
530 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, |
531 | dqp->q_blkno, | |
532 | mp->m_quotainfo->qi_dqchunklen, | |
533 | 0, &bp); | |
1da177e4 LT |
534 | if (error || !bp) |
535 | return XFS_ERROR(error); | |
536 | } | |
acecf1b5 | 537 | |
0c842ad4 | 538 | ASSERT(xfs_buf_islocked(bp)); |
1da177e4 LT |
539 | |
540 | /* | |
541 | * calculate the location of the dquot inside the buffer. | |
542 | */ | |
62926044 | 543 | ddq = bp->b_addr + dqp->q_bufoffset; |
1da177e4 LT |
544 | |
545 | /* | |
546 | * A simple sanity check in case we got a corrupted dquot... | |
547 | */ | |
a0fa2b67 | 548 | error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES, |
1da177e4 | 549 | flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN), |
a0fa2b67 DC |
550 | "dqtobp"); |
551 | if (error) { | |
1da177e4 LT |
552 | if (!(flags & XFS_QMOPT_DQREPAIR)) { |
553 | xfs_trans_brelse(tp, bp); | |
554 | return XFS_ERROR(EIO); | |
555 | } | |
1da177e4 LT |
556 | } |
557 | ||
558 | *O_bpp = bp; | |
559 | *O_ddpp = ddq; | |
560 | ||
561 | return (0); | |
562 | } | |
563 | ||
564 | ||
565 | /* | |
566 | * Read in the ondisk dquot using dqtobp() then copy it to an incore version, | |
567 | * and release the buffer immediately. | |
568 | * | |
569 | */ | |
570 | /* ARGSUSED */ | |
571 | STATIC int | |
572 | xfs_qm_dqread( | |
efa092f3 | 573 | xfs_trans_t **tpp, |
1da177e4 LT |
574 | xfs_dqid_t id, |
575 | xfs_dquot_t *dqp, /* dquot to get filled in */ | |
576 | uint flags) | |
577 | { | |
578 | xfs_disk_dquot_t *ddqp; | |
579 | xfs_buf_t *bp; | |
580 | int error; | |
efa092f3 TS |
581 | xfs_trans_t *tp; |
582 | ||
583 | ASSERT(tpp); | |
1da177e4 | 584 | |
0b1b213f CH |
585 | trace_xfs_dqread(dqp); |
586 | ||
1da177e4 LT |
587 | /* |
588 | * get a pointer to the on-disk dquot and the buffer containing it | |
589 | * dqp already knows its own type (GROUP/USER). | |
590 | */ | |
efa092f3 | 591 | if ((error = xfs_qm_dqtobp(tpp, dqp, &ddqp, &bp, flags))) { |
1da177e4 LT |
592 | return (error); |
593 | } | |
efa092f3 | 594 | tp = *tpp; |
1da177e4 LT |
595 | |
596 | /* copy everything from disk dquot to the incore dquot */ | |
597 | memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t)); | |
1149d96a | 598 | ASSERT(be32_to_cpu(dqp->q_core.d_id) == id); |
1da177e4 LT |
599 | xfs_qm_dquot_logitem_init(dqp); |
600 | ||
601 | /* | |
602 | * Reservation counters are defined as reservation plus current usage | |
25985edc | 603 | * to avoid having to add every time. |
1da177e4 | 604 | */ |
1149d96a CH |
605 | dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount); |
606 | dqp->q_res_icount = be64_to_cpu(ddqp->d_icount); | |
607 | dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount); | |
1da177e4 LT |
608 | |
609 | /* Mark the buf so that this will stay incore a little longer */ | |
610 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF); | |
611 | ||
612 | /* | |
613 | * We got the buffer with a xfs_trans_read_buf() (in dqtobp()) | |
614 | * So we need to release with xfs_trans_brelse(). | |
615 | * The strategy here is identical to that of inodes; we lock | |
616 | * the dquot in xfs_qm_dqget() before making it accessible to | |
617 | * others. This is because dquots, like inodes, need a good level of | |
618 | * concurrency, and we don't want to take locks on the entire buffers | |
619 | * for dquot accesses. | |
620 | * Note also that the dquot buffer may even be dirty at this point, if | |
621 | * this particular dquot was repaired. We still aren't afraid to | |
622 | * brelse it because we have the changes incore. | |
623 | */ | |
0c842ad4 | 624 | ASSERT(xfs_buf_islocked(bp)); |
1da177e4 LT |
625 | xfs_trans_brelse(tp, bp); |
626 | ||
627 | return (error); | |
628 | } | |
629 | ||
630 | ||
631 | /* | |
632 | * allocate an incore dquot from the kernel heap, | |
633 | * and fill its core with quota information kept on disk. | |
634 | * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk | |
635 | * if it wasn't already allocated. | |
636 | */ | |
637 | STATIC int | |
638 | xfs_qm_idtodq( | |
639 | xfs_mount_t *mp, | |
640 | xfs_dqid_t id, /* gid or uid, depending on type */ | |
641 | uint type, /* UDQUOT or GDQUOT */ | |
642 | uint flags, /* DQALLOC, DQREPAIR */ | |
643 | xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */ | |
644 | { | |
645 | xfs_dquot_t *dqp; | |
646 | int error; | |
647 | xfs_trans_t *tp; | |
648 | int cancelflags=0; | |
649 | ||
650 | dqp = xfs_qm_dqinit(mp, id, type); | |
651 | tp = NULL; | |
652 | if (flags & XFS_QMOPT_DQALLOC) { | |
653 | tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC); | |
8a7b8a89 CH |
654 | error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp), |
655 | XFS_WRITE_LOG_RES(mp) + | |
656 | BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 + | |
657 | 128, | |
658 | 0, | |
659 | XFS_TRANS_PERM_LOG_RES, | |
660 | XFS_WRITE_LOG_COUNT); | |
661 | if (error) { | |
1da177e4 LT |
662 | cancelflags = 0; |
663 | goto error0; | |
664 | } | |
665 | cancelflags = XFS_TRANS_RELEASE_LOG_RES; | |
666 | } | |
667 | ||
668 | /* | |
669 | * Read it from disk; xfs_dqread() takes care of | |
670 | * all the necessary initialization of dquot's fields (locks, etc) | |
671 | */ | |
efa092f3 | 672 | if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) { |
1da177e4 LT |
673 | /* |
674 | * This can happen if quotas got turned off (ESRCH), | |
675 | * or if the dquot didn't exist on disk and we ask to | |
676 | * allocate (ENOENT). | |
677 | */ | |
0b1b213f | 678 | trace_xfs_dqread_fail(dqp); |
1da177e4 LT |
679 | cancelflags |= XFS_TRANS_ABORT; |
680 | goto error0; | |
681 | } | |
682 | if (tp) { | |
1c72bf90 | 683 | if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) |
1da177e4 LT |
684 | goto error1; |
685 | } | |
686 | ||
687 | *O_dqpp = dqp; | |
688 | return (0); | |
689 | ||
690 | error0: | |
691 | ASSERT(error); | |
692 | if (tp) | |
693 | xfs_trans_cancel(tp, cancelflags); | |
694 | error1: | |
695 | xfs_qm_dqdestroy(dqp); | |
696 | *O_dqpp = NULL; | |
697 | return (error); | |
698 | } | |
699 | ||
700 | /* | |
701 | * Lookup a dquot in the incore dquot hashtable. We keep two separate | |
702 | * hashtables for user and group dquots; and, these are global tables | |
703 | * inside the XQM, not per-filesystem tables. | |
704 | * The hash chain must be locked by caller, and it is left locked | |
705 | * on return. Returning dquot is locked. | |
706 | */ | |
707 | STATIC int | |
708 | xfs_qm_dqlookup( | |
709 | xfs_mount_t *mp, | |
710 | xfs_dqid_t id, | |
711 | xfs_dqhash_t *qh, | |
712 | xfs_dquot_t **O_dqpp) | |
713 | { | |
714 | xfs_dquot_t *dqp; | |
715 | uint flist_locked; | |
1da177e4 | 716 | |
c9a192dc | 717 | ASSERT(mutex_is_locked(&qh->qh_lock)); |
1da177e4 LT |
718 | |
719 | flist_locked = B_FALSE; | |
720 | ||
721 | /* | |
722 | * Traverse the hashchain looking for a match | |
723 | */ | |
e6a81f13 | 724 | list_for_each_entry(dqp, &qh->qh_list, q_hashlist) { |
1da177e4 LT |
725 | /* |
726 | * We already have the hashlock. We don't need the | |
727 | * dqlock to look at the id field of the dquot, since the | |
728 | * id can't be modified without the hashlock anyway. | |
729 | */ | |
1149d96a | 730 | if (be32_to_cpu(dqp->q_core.d_id) == id && dqp->q_mount == mp) { |
0b1b213f CH |
731 | trace_xfs_dqlookup_found(dqp); |
732 | ||
1da177e4 LT |
733 | /* |
734 | * All in core dquots must be on the dqlist of mp | |
735 | */ | |
3a25404b | 736 | ASSERT(!list_empty(&dqp->q_mplist)); |
1da177e4 LT |
737 | |
738 | xfs_dqlock(dqp); | |
739 | if (dqp->q_nrefs == 0) { | |
3a8406f6 DC |
740 | ASSERT(!list_empty(&dqp->q_freelist)); |
741 | if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) { | |
0b1b213f | 742 | trace_xfs_dqlookup_want(dqp); |
1da177e4 LT |
743 | |
744 | /* | |
745 | * We may have raced with dqreclaim_one() | |
746 | * (and lost). So, flag that we don't | |
747 | * want the dquot to be reclaimed. | |
748 | */ | |
749 | dqp->dq_flags |= XFS_DQ_WANT; | |
750 | xfs_dqunlock(dqp); | |
3a8406f6 | 751 | mutex_lock(&xfs_Gqm->qm_dqfrlist_lock); |
1da177e4 LT |
752 | xfs_dqlock(dqp); |
753 | dqp->dq_flags &= ~(XFS_DQ_WANT); | |
754 | } | |
755 | flist_locked = B_TRUE; | |
756 | } | |
757 | ||
758 | /* | |
759 | * id couldn't have changed; we had the hashlock all | |
760 | * along | |
761 | */ | |
1149d96a | 762 | ASSERT(be32_to_cpu(dqp->q_core.d_id) == id); |
1da177e4 LT |
763 | |
764 | if (flist_locked) { | |
765 | if (dqp->q_nrefs != 0) { | |
3a8406f6 | 766 | mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock); |
1da177e4 LT |
767 | flist_locked = B_FALSE; |
768 | } else { | |
3a8406f6 | 769 | /* take it off the freelist */ |
0b1b213f | 770 | trace_xfs_dqlookup_freelist(dqp); |
3a8406f6 DC |
771 | list_del_init(&dqp->q_freelist); |
772 | xfs_Gqm->qm_dqfrlist_cnt--; | |
1da177e4 LT |
773 | } |
774 | } | |
775 | ||
1da177e4 LT |
776 | XFS_DQHOLD(dqp); |
777 | ||
778 | if (flist_locked) | |
3a8406f6 | 779 | mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock); |
1da177e4 LT |
780 | /* |
781 | * move the dquot to the front of the hashchain | |
782 | */ | |
c9a192dc | 783 | ASSERT(mutex_is_locked(&qh->qh_lock)); |
e6a81f13 | 784 | list_move(&dqp->q_hashlist, &qh->qh_list); |
0b1b213f | 785 | trace_xfs_dqlookup_done(dqp); |
1da177e4 | 786 | *O_dqpp = dqp; |
e6a81f13 | 787 | return 0; |
1da177e4 LT |
788 | } |
789 | } | |
790 | ||
791 | *O_dqpp = NULL; | |
c9a192dc | 792 | ASSERT(mutex_is_locked(&qh->qh_lock)); |
1da177e4 LT |
793 | return (1); |
794 | } | |
795 | ||
796 | /* | |
797 | * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a | |
798 | * a locked dquot, doing an allocation (if requested) as needed. | |
799 | * When both an inode and an id are given, the inode's id takes precedence. | |
800 | * That is, if the id changes while we don't hold the ilock inside this | |
801 | * function, the new dquot is returned, not necessarily the one requested | |
802 | * in the id argument. | |
803 | */ | |
804 | int | |
805 | xfs_qm_dqget( | |
806 | xfs_mount_t *mp, | |
807 | xfs_inode_t *ip, /* locked inode (optional) */ | |
c8ad20ff NS |
808 | xfs_dqid_t id, /* uid/projid/gid depending on type */ |
809 | uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */ | |
1da177e4 LT |
810 | uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */ |
811 | xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */ | |
812 | { | |
813 | xfs_dquot_t *dqp; | |
814 | xfs_dqhash_t *h; | |
815 | uint version; | |
816 | int error; | |
817 | ||
818 | ASSERT(XFS_IS_QUOTA_RUNNING(mp)); | |
819 | if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) || | |
c8ad20ff | 820 | (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) || |
1da177e4 LT |
821 | (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) { |
822 | return (ESRCH); | |
823 | } | |
824 | h = XFS_DQ_HASH(mp, id, type); | |
825 | ||
826 | #ifdef DEBUG | |
827 | if (xfs_do_dqerror) { | |
828 | if ((xfs_dqerror_target == mp->m_ddev_targp) && | |
829 | (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) { | |
0b932ccc | 830 | xfs_debug(mp, "Returning error in dqget"); |
1da177e4 LT |
831 | return (EIO); |
832 | } | |
833 | } | |
834 | #endif | |
835 | ||
836 | again: | |
837 | ||
838 | #ifdef DEBUG | |
c8ad20ff NS |
839 | ASSERT(type == XFS_DQ_USER || |
840 | type == XFS_DQ_PROJ || | |
841 | type == XFS_DQ_GROUP); | |
1da177e4 | 842 | if (ip) { |
579aa9ca | 843 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
844 | if (type == XFS_DQ_USER) |
845 | ASSERT(ip->i_udquot == NULL); | |
846 | else | |
847 | ASSERT(ip->i_gdquot == NULL); | |
848 | } | |
849 | #endif | |
c9a192dc | 850 | mutex_lock(&h->qh_lock); |
1da177e4 LT |
851 | |
852 | /* | |
853 | * Look in the cache (hashtable). | |
854 | * The chain is kept locked during lookup. | |
855 | */ | |
856 | if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) { | |
857 | XQM_STATS_INC(xqmstats.xs_qm_dqcachehits); | |
858 | /* | |
859 | * The dquot was found, moved to the front of the chain, | |
860 | * taken off the freelist if it was on it, and locked | |
861 | * at this point. Just unlock the hashchain and return. | |
862 | */ | |
863 | ASSERT(*O_dqpp); | |
864 | ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp)); | |
c9a192dc | 865 | mutex_unlock(&h->qh_lock); |
0b1b213f | 866 | trace_xfs_dqget_hit(*O_dqpp); |
1da177e4 LT |
867 | return (0); /* success */ |
868 | } | |
869 | XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses); | |
870 | ||
871 | /* | |
872 | * Dquot cache miss. We don't want to keep the inode lock across | |
873 | * a (potential) disk read. Also we don't want to deal with the lock | |
874 | * ordering between quotainode and this inode. OTOH, dropping the inode | |
875 | * lock here means dealing with a chown that can happen before | |
876 | * we re-acquire the lock. | |
877 | */ | |
878 | if (ip) | |
879 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
880 | /* | |
881 | * Save the hashchain version stamp, and unlock the chain, so that | |
882 | * we don't keep the lock across a disk read | |
883 | */ | |
884 | version = h->qh_version; | |
c9a192dc | 885 | mutex_unlock(&h->qh_lock); |
1da177e4 LT |
886 | |
887 | /* | |
888 | * Allocate the dquot on the kernel heap, and read the ondisk | |
889 | * portion off the disk. Also, do all the necessary initialization | |
890 | * This can return ENOENT if dquot didn't exist on disk and we didn't | |
891 | * ask it to allocate; ESRCH if quotas got turned off suddenly. | |
892 | */ | |
893 | if ((error = xfs_qm_idtodq(mp, id, type, | |
894 | flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR| | |
895 | XFS_QMOPT_DOWARN), | |
896 | &dqp))) { | |
897 | if (ip) | |
898 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
899 | return (error); | |
900 | } | |
901 | ||
902 | /* | |
903 | * See if this is mount code calling to look at the overall quota limits | |
904 | * which are stored in the id == 0 user or group's dquot. | |
905 | * Since we may not have done a quotacheck by this point, just return | |
906 | * the dquot without attaching it to any hashtables, lists, etc, or even | |
907 | * taking a reference. | |
908 | * The caller must dqdestroy this once done. | |
909 | */ | |
910 | if (flags & XFS_QMOPT_DQSUSER) { | |
911 | ASSERT(id == 0); | |
912 | ASSERT(! ip); | |
913 | goto dqret; | |
914 | } | |
915 | ||
916 | /* | |
917 | * Dquot lock comes after hashlock in the lock ordering | |
918 | */ | |
919 | if (ip) { | |
920 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
191f8488 | 921 | |
1da177e4 LT |
922 | /* |
923 | * A dquot could be attached to this inode by now, since | |
924 | * we had dropped the ilock. | |
925 | */ | |
926 | if (type == XFS_DQ_USER) { | |
191f8488 CH |
927 | if (!XFS_IS_UQUOTA_ON(mp)) { |
928 | /* inode stays locked on return */ | |
929 | xfs_qm_dqdestroy(dqp); | |
930 | return XFS_ERROR(ESRCH); | |
931 | } | |
1da177e4 LT |
932 | if (ip->i_udquot) { |
933 | xfs_qm_dqdestroy(dqp); | |
934 | dqp = ip->i_udquot; | |
935 | xfs_dqlock(dqp); | |
936 | goto dqret; | |
937 | } | |
938 | } else { | |
191f8488 CH |
939 | if (!XFS_IS_OQUOTA_ON(mp)) { |
940 | /* inode stays locked on return */ | |
941 | xfs_qm_dqdestroy(dqp); | |
942 | return XFS_ERROR(ESRCH); | |
943 | } | |
1da177e4 LT |
944 | if (ip->i_gdquot) { |
945 | xfs_qm_dqdestroy(dqp); | |
946 | dqp = ip->i_gdquot; | |
947 | xfs_dqlock(dqp); | |
948 | goto dqret; | |
949 | } | |
950 | } | |
951 | } | |
952 | ||
953 | /* | |
954 | * Hashlock comes after ilock in lock order | |
955 | */ | |
c9a192dc | 956 | mutex_lock(&h->qh_lock); |
1da177e4 LT |
957 | if (version != h->qh_version) { |
958 | xfs_dquot_t *tmpdqp; | |
959 | /* | |
960 | * Now, see if somebody else put the dquot in the | |
961 | * hashtable before us. This can happen because we didn't | |
962 | * keep the hashchain lock. We don't have to worry about | |
963 | * lock order between the two dquots here since dqp isn't | |
964 | * on any findable lists yet. | |
965 | */ | |
966 | if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) { | |
967 | /* | |
968 | * Duplicate found. Just throw away the new dquot | |
969 | * and start over. | |
970 | */ | |
971 | xfs_qm_dqput(tmpdqp); | |
c9a192dc | 972 | mutex_unlock(&h->qh_lock); |
1da177e4 LT |
973 | xfs_qm_dqdestroy(dqp); |
974 | XQM_STATS_INC(xqmstats.xs_qm_dquot_dups); | |
975 | goto again; | |
976 | } | |
977 | } | |
978 | ||
979 | /* | |
980 | * Put the dquot at the beginning of the hash-chain and mp's list | |
981 | * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock .. | |
982 | */ | |
c9a192dc | 983 | ASSERT(mutex_is_locked(&h->qh_lock)); |
1da177e4 | 984 | dqp->q_hash = h; |
e6a81f13 DC |
985 | list_add(&dqp->q_hashlist, &h->qh_list); |
986 | h->qh_version++; | |
1da177e4 LT |
987 | |
988 | /* | |
989 | * Attach this dquot to this filesystem's list of all dquots, | |
990 | * kept inside the mount structure in m_quotainfo field | |
991 | */ | |
3a25404b | 992 | mutex_lock(&mp->m_quotainfo->qi_dqlist_lock); |
1da177e4 LT |
993 | |
994 | /* | |
995 | * We return a locked dquot to the caller, with a reference taken | |
996 | */ | |
997 | xfs_dqlock(dqp); | |
998 | dqp->q_nrefs = 1; | |
999 | ||
3a25404b DC |
1000 | list_add(&dqp->q_mplist, &mp->m_quotainfo->qi_dqlist); |
1001 | mp->m_quotainfo->qi_dquots++; | |
1002 | mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock); | |
c9a192dc | 1003 | mutex_unlock(&h->qh_lock); |
1da177e4 | 1004 | dqret: |
579aa9ca | 1005 | ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
0b1b213f | 1006 | trace_xfs_dqget_miss(dqp); |
1da177e4 LT |
1007 | *O_dqpp = dqp; |
1008 | return (0); | |
1009 | } | |
1010 | ||
1011 | ||
1012 | /* | |
1013 | * Release a reference to the dquot (decrement ref-count) | |
1014 | * and unlock it. If there is a group quota attached to this | |
1015 | * dquot, carefully release that too without tripping over | |
1016 | * deadlocks'n'stuff. | |
1017 | */ | |
1018 | void | |
1019 | xfs_qm_dqput( | |
1020 | xfs_dquot_t *dqp) | |
1021 | { | |
1022 | xfs_dquot_t *gdqp; | |
1023 | ||
1024 | ASSERT(dqp->q_nrefs > 0); | |
1025 | ASSERT(XFS_DQ_IS_LOCKED(dqp)); | |
0b1b213f CH |
1026 | |
1027 | trace_xfs_dqput(dqp); | |
1da177e4 LT |
1028 | |
1029 | if (dqp->q_nrefs != 1) { | |
1030 | dqp->q_nrefs--; | |
1031 | xfs_dqunlock(dqp); | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * drop the dqlock and acquire the freelist and dqlock | |
1037 | * in the right order; but try to get it out-of-order first | |
1038 | */ | |
3a8406f6 | 1039 | if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) { |
0b1b213f | 1040 | trace_xfs_dqput_wait(dqp); |
1da177e4 | 1041 | xfs_dqunlock(dqp); |
3a8406f6 | 1042 | mutex_lock(&xfs_Gqm->qm_dqfrlist_lock); |
1da177e4 LT |
1043 | xfs_dqlock(dqp); |
1044 | } | |
1045 | ||
1046 | while (1) { | |
1047 | gdqp = NULL; | |
1048 | ||
1049 | /* We can't depend on nrefs being == 1 here */ | |
1050 | if (--dqp->q_nrefs == 0) { | |
0b1b213f CH |
1051 | trace_xfs_dqput_free(dqp); |
1052 | ||
3a8406f6 DC |
1053 | list_add_tail(&dqp->q_freelist, &xfs_Gqm->qm_dqfrlist); |
1054 | xfs_Gqm->qm_dqfrlist_cnt++; | |
1da177e4 LT |
1055 | |
1056 | /* | |
1057 | * If we just added a udquot to the freelist, then | |
1058 | * we want to release the gdquot reference that | |
1059 | * it (probably) has. Otherwise it'll keep the | |
1060 | * gdquot from getting reclaimed. | |
1061 | */ | |
1062 | if ((gdqp = dqp->q_gdquot)) { | |
1063 | /* | |
1064 | * Avoid a recursive dqput call | |
1065 | */ | |
1066 | xfs_dqlock(gdqp); | |
1067 | dqp->q_gdquot = NULL; | |
1068 | } | |
1da177e4 LT |
1069 | } |
1070 | xfs_dqunlock(dqp); | |
1071 | ||
1072 | /* | |
1073 | * If we had a group quota inside the user quota as a hint, | |
1074 | * release it now. | |
1075 | */ | |
1076 | if (! gdqp) | |
1077 | break; | |
1078 | dqp = gdqp; | |
1079 | } | |
3a8406f6 | 1080 | mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock); |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | /* | |
1084 | * Release a dquot. Flush it if dirty, then dqput() it. | |
1085 | * dquot must not be locked. | |
1086 | */ | |
1087 | void | |
1088 | xfs_qm_dqrele( | |
1089 | xfs_dquot_t *dqp) | |
1090 | { | |
7d095257 CH |
1091 | if (!dqp) |
1092 | return; | |
1093 | ||
0b1b213f | 1094 | trace_xfs_dqrele(dqp); |
1da177e4 LT |
1095 | |
1096 | xfs_dqlock(dqp); | |
1097 | /* | |
1098 | * We don't care to flush it if the dquot is dirty here. | |
1099 | * That will create stutters that we want to avoid. | |
1100 | * Instead we do a delayed write when we try to reclaim | |
1101 | * a dirty dquot. Also xfs_sync will take part of the burden... | |
1102 | */ | |
1103 | xfs_qm_dqput(dqp); | |
1104 | } | |
1105 | ||
ca30b2a7 CH |
1106 | /* |
1107 | * This is the dquot flushing I/O completion routine. It is called | |
1108 | * from interrupt level when the buffer containing the dquot is | |
1109 | * flushed to disk. It is responsible for removing the dquot logitem | |
1110 | * from the AIL if it has not been re-logged, and unlocking the dquot's | |
1111 | * flush lock. This behavior is very similar to that of inodes.. | |
1112 | */ | |
1113 | STATIC void | |
1114 | xfs_qm_dqflush_done( | |
1115 | struct xfs_buf *bp, | |
1116 | struct xfs_log_item *lip) | |
1117 | { | |
1118 | xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip; | |
1119 | xfs_dquot_t *dqp = qip->qli_dquot; | |
1120 | struct xfs_ail *ailp = lip->li_ailp; | |
1121 | ||
1122 | /* | |
1123 | * We only want to pull the item from the AIL if its | |
1124 | * location in the log has not changed since we started the flush. | |
1125 | * Thus, we only bother if the dquot's lsn has | |
1126 | * not changed. First we check the lsn outside the lock | |
1127 | * since it's cheaper, and then we recheck while | |
1128 | * holding the lock before removing the dquot from the AIL. | |
1129 | */ | |
1130 | if ((lip->li_flags & XFS_LI_IN_AIL) && | |
1131 | lip->li_lsn == qip->qli_flush_lsn) { | |
1132 | ||
1133 | /* xfs_trans_ail_delete() drops the AIL lock. */ | |
1134 | spin_lock(&ailp->xa_lock); | |
1135 | if (lip->li_lsn == qip->qli_flush_lsn) | |
1136 | xfs_trans_ail_delete(ailp, lip); | |
1137 | else | |
1138 | spin_unlock(&ailp->xa_lock); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Release the dq's flush lock since we're done with it. | |
1143 | */ | |
1144 | xfs_dqfunlock(dqp); | |
1145 | } | |
1da177e4 LT |
1146 | |
1147 | /* | |
1148 | * Write a modified dquot to disk. | |
1149 | * The dquot must be locked and the flush lock too taken by caller. | |
1150 | * The flush lock will not be unlocked until the dquot reaches the disk, | |
1151 | * but the dquot is free to be unlocked and modified by the caller | |
1152 | * in the interim. Dquot is still locked on return. This behavior is | |
1153 | * identical to that of inodes. | |
1154 | */ | |
1155 | int | |
1156 | xfs_qm_dqflush( | |
1157 | xfs_dquot_t *dqp, | |
1158 | uint flags) | |
1159 | { | |
acecf1b5 CH |
1160 | struct xfs_mount *mp = dqp->q_mount; |
1161 | struct xfs_buf *bp; | |
1162 | struct xfs_disk_dquot *ddqp; | |
1da177e4 | 1163 | int error; |
1da177e4 LT |
1164 | |
1165 | ASSERT(XFS_DQ_IS_LOCKED(dqp)); | |
e1f49cf2 | 1166 | ASSERT(!completion_done(&dqp->q_flush)); |
acecf1b5 | 1167 | |
0b1b213f | 1168 | trace_xfs_dqflush(dqp); |
1da177e4 LT |
1169 | |
1170 | /* | |
acecf1b5 | 1171 | * If not dirty, or it's pinned and we are not supposed to block, nada. |
1da177e4 | 1172 | */ |
2f8a3ce1 | 1173 | if (!XFS_DQ_IS_DIRTY(dqp) || |
20026d92 | 1174 | (!(flags & SYNC_WAIT) && atomic_read(&dqp->q_pincount) > 0)) { |
1da177e4 | 1175 | xfs_dqfunlock(dqp); |
2f8a3ce1 | 1176 | return 0; |
1da177e4 | 1177 | } |
1da177e4 LT |
1178 | xfs_qm_dqunpin_wait(dqp); |
1179 | ||
1180 | /* | |
1181 | * This may have been unpinned because the filesystem is shutting | |
1182 | * down forcibly. If that's the case we must not write this dquot | |
1183 | * to disk, because the log record didn't make it to disk! | |
1184 | */ | |
acecf1b5 CH |
1185 | if (XFS_FORCED_SHUTDOWN(mp)) { |
1186 | dqp->dq_flags &= ~XFS_DQ_DIRTY; | |
1da177e4 LT |
1187 | xfs_dqfunlock(dqp); |
1188 | return XFS_ERROR(EIO); | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Get the buffer containing the on-disk dquot | |
1da177e4 | 1193 | */ |
acecf1b5 CH |
1194 | error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, |
1195 | mp->m_quotainfo->qi_dqchunklen, 0, &bp); | |
1196 | if (error) { | |
1da177e4 | 1197 | ASSERT(error != ENOENT); |
1da177e4 | 1198 | xfs_dqfunlock(dqp); |
acecf1b5 | 1199 | return error; |
1da177e4 LT |
1200 | } |
1201 | ||
acecf1b5 CH |
1202 | /* |
1203 | * Calculate the location of the dquot inside the buffer. | |
1204 | */ | |
62926044 | 1205 | ddqp = bp->b_addr + dqp->q_bufoffset; |
acecf1b5 CH |
1206 | |
1207 | /* | |
1208 | * A simple sanity check in case we got a corrupted dquot.. | |
1209 | */ | |
a0fa2b67 DC |
1210 | error = xfs_qm_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0, |
1211 | XFS_QMOPT_DOWARN, "dqflush (incore copy)"); | |
1212 | if (error) { | |
acecf1b5 CH |
1213 | xfs_buf_relse(bp); |
1214 | xfs_dqfunlock(dqp); | |
1215 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); | |
1da177e4 LT |
1216 | return XFS_ERROR(EIO); |
1217 | } | |
1218 | ||
1219 | /* This is the only portion of data that needs to persist */ | |
acecf1b5 | 1220 | memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t)); |
1da177e4 LT |
1221 | |
1222 | /* | |
1223 | * Clear the dirty field and remember the flush lsn for later use. | |
1224 | */ | |
acecf1b5 | 1225 | dqp->dq_flags &= ~XFS_DQ_DIRTY; |
1da177e4 | 1226 | |
7b2e2a31 DC |
1227 | xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn, |
1228 | &dqp->q_logitem.qli_item.li_lsn); | |
1da177e4 LT |
1229 | |
1230 | /* | |
1231 | * Attach an iodone routine so that we can remove this dquot from the | |
1232 | * AIL and release the flush lock once the dquot is synced to disk. | |
1233 | */ | |
ca30b2a7 CH |
1234 | xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done, |
1235 | &dqp->q_logitem.qli_item); | |
1236 | ||
1da177e4 LT |
1237 | /* |
1238 | * If the buffer is pinned then push on the log so we won't | |
1239 | * get stuck waiting in the write for too long. | |
1240 | */ | |
811e64c7 | 1241 | if (xfs_buf_ispinned(bp)) { |
0b1b213f | 1242 | trace_xfs_dqflush_force(dqp); |
a14a348b | 1243 | xfs_log_force(mp, 0); |
1da177e4 LT |
1244 | } |
1245 | ||
20026d92 | 1246 | if (flags & SYNC_WAIT) |
c2b006c1 CH |
1247 | error = xfs_bwrite(bp); |
1248 | else | |
61551f1e | 1249 | xfs_buf_delwri_queue(bp); |
c2b006c1 CH |
1250 | |
1251 | xfs_buf_relse(bp); | |
0b1b213f CH |
1252 | |
1253 | trace_xfs_dqflush_done(dqp); | |
1254 | ||
1da177e4 LT |
1255 | /* |
1256 | * dqp is still locked, but caller is free to unlock it now. | |
1257 | */ | |
20026d92 | 1258 | return error; |
1da177e4 LT |
1259 | |
1260 | } | |
1261 | ||
1da177e4 LT |
1262 | int |
1263 | xfs_qm_dqlock_nowait( | |
1264 | xfs_dquot_t *dqp) | |
1265 | { | |
e1f49cf2 | 1266 | return mutex_trylock(&dqp->q_qlock); |
1da177e4 LT |
1267 | } |
1268 | ||
1269 | void | |
1270 | xfs_dqlock( | |
1271 | xfs_dquot_t *dqp) | |
1272 | { | |
e1f49cf2 | 1273 | mutex_lock(&dqp->q_qlock); |
1da177e4 LT |
1274 | } |
1275 | ||
1276 | void | |
1277 | xfs_dqunlock( | |
1278 | xfs_dquot_t *dqp) | |
1279 | { | |
1280 | mutex_unlock(&(dqp->q_qlock)); | |
1281 | if (dqp->q_logitem.qli_dquot == dqp) { | |
1282 | /* Once was dqp->q_mount, but might just have been cleared */ | |
783a2f65 | 1283 | xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp, |
1da177e4 LT |
1284 | (xfs_log_item_t*)&(dqp->q_logitem)); |
1285 | } | |
1286 | } | |
1287 | ||
1288 | ||
1289 | void | |
1290 | xfs_dqunlock_nonotify( | |
1291 | xfs_dquot_t *dqp) | |
1292 | { | |
1293 | mutex_unlock(&(dqp->q_qlock)); | |
1294 | } | |
1295 | ||
5bb87a33 CH |
1296 | /* |
1297 | * Lock two xfs_dquot structures. | |
1298 | * | |
1299 | * To avoid deadlocks we always lock the quota structure with | |
1300 | * the lowerd id first. | |
1301 | */ | |
1da177e4 LT |
1302 | void |
1303 | xfs_dqlock2( | |
1304 | xfs_dquot_t *d1, | |
1305 | xfs_dquot_t *d2) | |
1306 | { | |
1307 | if (d1 && d2) { | |
1308 | ASSERT(d1 != d2); | |
1149d96a CH |
1309 | if (be32_to_cpu(d1->q_core.d_id) > |
1310 | be32_to_cpu(d2->q_core.d_id)) { | |
5bb87a33 CH |
1311 | mutex_lock(&d2->q_qlock); |
1312 | mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED); | |
1da177e4 | 1313 | } else { |
5bb87a33 CH |
1314 | mutex_lock(&d1->q_qlock); |
1315 | mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED); | |
1da177e4 | 1316 | } |
5bb87a33 CH |
1317 | } else if (d1) { |
1318 | mutex_lock(&d1->q_qlock); | |
1319 | } else if (d2) { | |
1320 | mutex_lock(&d2->q_qlock); | |
1da177e4 LT |
1321 | } |
1322 | } | |
1323 | ||
1324 | ||
1325 | /* | |
1326 | * Take a dquot out of the mount's dqlist as well as the hashlist. | |
1327 | * This is called via unmount as well as quotaoff, and the purge | |
1328 | * will always succeed unless there are soft (temp) references | |
1329 | * outstanding. | |
1330 | * | |
1331 | * This returns 0 if it was purged, 1 if it wasn't. It's not an error code | |
1332 | * that we're returning! XXXsup - not cool. | |
1333 | */ | |
1334 | /* ARGSUSED */ | |
1335 | int | |
1336 | xfs_qm_dqpurge( | |
4f0e8a98 | 1337 | xfs_dquot_t *dqp) |
1da177e4 | 1338 | { |
e6a81f13 | 1339 | xfs_dqhash_t *qh = dqp->q_hash; |
3c56836f | 1340 | xfs_mount_t *mp = dqp->q_mount; |
1da177e4 | 1341 | |
3a25404b | 1342 | ASSERT(mutex_is_locked(&mp->m_quotainfo->qi_dqlist_lock)); |
c9a192dc | 1343 | ASSERT(mutex_is_locked(&dqp->q_hash->qh_lock)); |
1da177e4 LT |
1344 | |
1345 | xfs_dqlock(dqp); | |
1346 | /* | |
1347 | * We really can't afford to purge a dquot that is | |
1348 | * referenced, because these are hard refs. | |
1349 | * It shouldn't happen in general because we went thru _all_ inodes in | |
1350 | * dqrele_all_inodes before calling this and didn't let the mountlock go. | |
1351 | * However it is possible that we have dquots with temporary | |
1352 | * references that are not attached to an inode. e.g. see xfs_setattr(). | |
1353 | */ | |
1354 | if (dqp->q_nrefs != 0) { | |
1355 | xfs_dqunlock(dqp); | |
c9a192dc | 1356 | mutex_unlock(&dqp->q_hash->qh_lock); |
1da177e4 LT |
1357 | return (1); |
1358 | } | |
1359 | ||
3a8406f6 | 1360 | ASSERT(!list_empty(&dqp->q_freelist)); |
1da177e4 LT |
1361 | |
1362 | /* | |
1363 | * If we're turning off quotas, we have to make sure that, for | |
1364 | * example, we don't delete quota disk blocks while dquots are | |
1365 | * in the process of getting written to those disk blocks. | |
1366 | * This dquot might well be on AIL, and we can't leave it there | |
1367 | * if we're turning off quotas. Basically, we need this flush | |
1368 | * lock, and are willing to block on it. | |
1369 | */ | |
e1f49cf2 | 1370 | if (!xfs_dqflock_nowait(dqp)) { |
1da177e4 LT |
1371 | /* |
1372 | * Block on the flush lock after nudging dquot buffer, | |
1373 | * if it is incore. | |
1374 | */ | |
1375 | xfs_qm_dqflock_pushbuf_wait(dqp); | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * XXXIf we're turning this type of quotas off, we don't care | |
1380 | * about the dirty metadata sitting in this dquot. OTOH, if | |
1381 | * we're unmounting, we do care, so we flush it and wait. | |
1382 | */ | |
1383 | if (XFS_DQ_IS_DIRTY(dqp)) { | |
3c56836f | 1384 | int error; |
0b1b213f | 1385 | |
1da177e4 LT |
1386 | /* dqflush unlocks dqflock */ |
1387 | /* | |
1388 | * Given that dqpurge is a very rare occurrence, it is OK | |
1389 | * that we're holding the hashlist and mplist locks | |
1390 | * across the disk write. But, ... XXXsup | |
1391 | * | |
1392 | * We don't care about getting disk errors here. We need | |
1393 | * to purge this dquot anyway, so we go ahead regardless. | |
1394 | */ | |
20026d92 | 1395 | error = xfs_qm_dqflush(dqp, SYNC_WAIT); |
3c56836f | 1396 | if (error) |
53487786 DC |
1397 | xfs_warn(mp, "%s: dquot %p flush failed", |
1398 | __func__, dqp); | |
1da177e4 LT |
1399 | xfs_dqflock(dqp); |
1400 | } | |
bc3048e3 | 1401 | ASSERT(atomic_read(&dqp->q_pincount) == 0); |
1da177e4 LT |
1402 | ASSERT(XFS_FORCED_SHUTDOWN(mp) || |
1403 | !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL)); | |
1404 | ||
e6a81f13 DC |
1405 | list_del_init(&dqp->q_hashlist); |
1406 | qh->qh_version++; | |
3a25404b DC |
1407 | list_del_init(&dqp->q_mplist); |
1408 | mp->m_quotainfo->qi_dqreclaims++; | |
1409 | mp->m_quotainfo->qi_dquots--; | |
1da177e4 LT |
1410 | /* |
1411 | * XXX Move this to the front of the freelist, if we can get the | |
1412 | * freelist lock. | |
1413 | */ | |
3a8406f6 | 1414 | ASSERT(!list_empty(&dqp->q_freelist)); |
1da177e4 LT |
1415 | |
1416 | dqp->q_mount = NULL; | |
1417 | dqp->q_hash = NULL; | |
1418 | dqp->dq_flags = XFS_DQ_INACTIVE; | |
1419 | memset(&dqp->q_core, 0, sizeof(dqp->q_core)); | |
1420 | xfs_dqfunlock(dqp); | |
1421 | xfs_dqunlock(dqp); | |
e6a81f13 | 1422 | mutex_unlock(&qh->qh_lock); |
1da177e4 LT |
1423 | return (0); |
1424 | } | |
1425 | ||
1426 | ||
1da177e4 LT |
1427 | /* |
1428 | * Give the buffer a little push if it is incore and | |
1429 | * wait on the flush lock. | |
1430 | */ | |
1431 | void | |
1432 | xfs_qm_dqflock_pushbuf_wait( | |
1433 | xfs_dquot_t *dqp) | |
1434 | { | |
8a7b8a89 | 1435 | xfs_mount_t *mp = dqp->q_mount; |
1da177e4 LT |
1436 | xfs_buf_t *bp; |
1437 | ||
1438 | /* | |
1439 | * Check to see if the dquot has been flushed delayed | |
1440 | * write. If so, grab its buffer and send it | |
1441 | * out immediately. We'll be able to acquire | |
1442 | * the flush lock when the I/O completes. | |
1443 | */ | |
8a7b8a89 CH |
1444 | bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno, |
1445 | mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK); | |
7d6a7bde DC |
1446 | if (!bp) |
1447 | goto out_lock; | |
1448 | ||
1449 | if (XFS_BUF_ISDELAYWRITE(bp)) { | |
811e64c7 | 1450 | if (xfs_buf_ispinned(bp)) |
8a7b8a89 | 1451 | xfs_log_force(mp, 0); |
7d6a7bde DC |
1452 | xfs_buf_delwri_promote(bp); |
1453 | wake_up_process(bp->b_target->bt_task); | |
1da177e4 | 1454 | } |
7d6a7bde DC |
1455 | xfs_buf_relse(bp); |
1456 | out_lock: | |
1da177e4 LT |
1457 | xfs_dqflock(dqp); |
1458 | } |