1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2003 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_format.h" 9 #include "xfs_log_format.h" 10 #include "xfs_shared.h" 11 #include "xfs_trans_resv.h" 12 #include "xfs_bit.h" 13 #include "xfs_mount.h" 14 #include "xfs_defer.h" 15 #include "xfs_inode.h" 16 #include "xfs_bmap.h" 17 #include "xfs_quota.h" 18 #include "xfs_trans.h" 19 #include "xfs_buf_item.h" 20 #include "xfs_trans_space.h" 21 #include "xfs_trans_priv.h" 22 #include "xfs_qm.h" 23 #include "xfs_trace.h" 24 #include "xfs_log.h" 25 #include "xfs_bmap_btree.h" 26 #include "xfs_error.h" 27 28 /* 29 * Lock order: 30 * 31 * ip->i_lock 32 * qi->qi_tree_lock 33 * dquot->q_qlock (xfs_dqlock() and friends) 34 * dquot->q_flush (xfs_dqflock() and friends) 35 * qi->qi_lru_lock 36 * 37 * If two dquots need to be locked the order is user before group/project, 38 * otherwise by the lowest id first, see xfs_dqlock2. 39 */ 40 41 struct kmem_cache *xfs_dqtrx_cache; 42 static struct kmem_cache *xfs_dquot_cache; 43 44 static struct lock_class_key xfs_dquot_group_class; 45 static struct lock_class_key xfs_dquot_project_class; 46 47 /* 48 * This is called to free all the memory associated with a dquot 49 */ 50 void 51 xfs_qm_dqdestroy( 52 struct xfs_dquot *dqp) 53 { 54 ASSERT(list_empty(&dqp->q_lru)); 55 56 kmem_free(dqp->q_logitem.qli_item.li_lv_shadow); 57 mutex_destroy(&dqp->q_qlock); 58 59 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot); 60 kmem_cache_free(xfs_dquot_cache, dqp); 61 } 62 63 /* 64 * If default limits are in force, push them into the dquot now. 65 * We overwrite the dquot limits only if they are zero and this 66 * is not the root dquot. 67 */ 68 void 69 xfs_qm_adjust_dqlimits( 70 struct xfs_dquot *dq) 71 { 72 struct xfs_mount *mp = dq->q_mount; 73 struct xfs_quotainfo *q = mp->m_quotainfo; 74 struct xfs_def_quota *defq; 75 int prealloc = 0; 76 77 ASSERT(dq->q_id); 78 defq = xfs_get_defquota(q, xfs_dquot_type(dq)); 79 80 if (!dq->q_blk.softlimit) { 81 dq->q_blk.softlimit = defq->blk.soft; 82 prealloc = 1; 83 } 84 if (!dq->q_blk.hardlimit) { 85 dq->q_blk.hardlimit = defq->blk.hard; 86 prealloc = 1; 87 } 88 if (!dq->q_ino.softlimit) 89 dq->q_ino.softlimit = defq->ino.soft; 90 if (!dq->q_ino.hardlimit) 91 dq->q_ino.hardlimit = defq->ino.hard; 92 if (!dq->q_rtb.softlimit) 93 dq->q_rtb.softlimit = defq->rtb.soft; 94 if (!dq->q_rtb.hardlimit) 95 dq->q_rtb.hardlimit = defq->rtb.hard; 96 97 if (prealloc) 98 xfs_dquot_set_prealloc_limits(dq); 99 } 100 101 /* Set the expiration time of a quota's grace period. */ 102 time64_t 103 xfs_dquot_set_timeout( 104 struct xfs_mount *mp, 105 time64_t timeout) 106 { 107 struct xfs_quotainfo *qi = mp->m_quotainfo; 108 109 return clamp_t(time64_t, timeout, qi->qi_expiry_min, 110 qi->qi_expiry_max); 111 } 112 113 /* Set the length of the default grace period. */ 114 time64_t 115 xfs_dquot_set_grace_period( 116 time64_t grace) 117 { 118 return clamp_t(time64_t, grace, XFS_DQ_GRACE_MIN, XFS_DQ_GRACE_MAX); 119 } 120 121 /* 122 * Determine if this quota counter is over either limit and set the quota 123 * timers as appropriate. 124 */ 125 static inline void 126 xfs_qm_adjust_res_timer( 127 struct xfs_mount *mp, 128 struct xfs_dquot_res *res, 129 struct xfs_quota_limits *qlim) 130 { 131 ASSERT(res->hardlimit == 0 || res->softlimit <= res->hardlimit); 132 133 if ((res->softlimit && res->count > res->softlimit) || 134 (res->hardlimit && res->count > res->hardlimit)) { 135 if (res->timer == 0) 136 res->timer = xfs_dquot_set_timeout(mp, 137 ktime_get_real_seconds() + qlim->time); 138 } else { 139 if (res->timer == 0) 140 res->warnings = 0; 141 else 142 res->timer = 0; 143 } 144 } 145 146 /* 147 * Check the limits and timers of a dquot and start or reset timers 148 * if necessary. 149 * This gets called even when quota enforcement is OFF, which makes our 150 * life a little less complicated. (We just don't reject any quota 151 * reservations in that case, when enforcement is off). 152 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when 153 * enforcement's off. 154 * In contrast, warnings are a little different in that they don't 155 * 'automatically' get started when limits get exceeded. They do 156 * get reset to zero, however, when we find the count to be under 157 * the soft limit (they are only ever set non-zero via userspace). 158 */ 159 void 160 xfs_qm_adjust_dqtimers( 161 struct xfs_dquot *dq) 162 { 163 struct xfs_mount *mp = dq->q_mount; 164 struct xfs_quotainfo *qi = mp->m_quotainfo; 165 struct xfs_def_quota *defq; 166 167 ASSERT(dq->q_id); 168 defq = xfs_get_defquota(qi, xfs_dquot_type(dq)); 169 170 xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_blk, &defq->blk); 171 xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_ino, &defq->ino); 172 xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_rtb, &defq->rtb); 173 } 174 175 /* 176 * initialize a buffer full of dquots and log the whole thing 177 */ 178 STATIC void 179 xfs_qm_init_dquot_blk( 180 struct xfs_trans *tp, 181 struct xfs_mount *mp, 182 xfs_dqid_t id, 183 xfs_dqtype_t type, 184 struct xfs_buf *bp) 185 { 186 struct xfs_quotainfo *q = mp->m_quotainfo; 187 struct xfs_dqblk *d; 188 xfs_dqid_t curid; 189 unsigned int qflag; 190 unsigned int blftype; 191 int i; 192 193 ASSERT(tp); 194 ASSERT(xfs_buf_islocked(bp)); 195 196 switch (type) { 197 case XFS_DQTYPE_USER: 198 qflag = XFS_UQUOTA_CHKD; 199 blftype = XFS_BLF_UDQUOT_BUF; 200 break; 201 case XFS_DQTYPE_PROJ: 202 qflag = XFS_PQUOTA_CHKD; 203 blftype = XFS_BLF_PDQUOT_BUF; 204 break; 205 case XFS_DQTYPE_GROUP: 206 qflag = XFS_GQUOTA_CHKD; 207 blftype = XFS_BLF_GDQUOT_BUF; 208 break; 209 default: 210 ASSERT(0); 211 return; 212 } 213 214 d = bp->b_addr; 215 216 /* 217 * ID of the first dquot in the block - id's are zero based. 218 */ 219 curid = id - (id % q->qi_dqperchunk); 220 memset(d, 0, BBTOB(q->qi_dqchunklen)); 221 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) { 222 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 223 d->dd_diskdq.d_version = XFS_DQUOT_VERSION; 224 d->dd_diskdq.d_id = cpu_to_be32(curid); 225 d->dd_diskdq.d_type = type; 226 if (curid > 0 && xfs_has_bigtime(mp)) 227 d->dd_diskdq.d_type |= XFS_DQTYPE_BIGTIME; 228 if (xfs_has_crc(mp)) { 229 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid); 230 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), 231 XFS_DQUOT_CRC_OFF); 232 } 233 } 234 235 xfs_trans_dquot_buf(tp, bp, blftype); 236 237 /* 238 * quotacheck uses delayed writes to update all the dquots on disk in an 239 * efficient manner instead of logging the individual dquot changes as 240 * they are made. However if we log the buffer allocated here and crash 241 * after quotacheck while the logged initialisation is still in the 242 * active region of the log, log recovery can replay the dquot buffer 243 * initialisation over the top of the checked dquots and corrupt quota 244 * accounting. 245 * 246 * To avoid this problem, quotacheck cannot log the initialised buffer. 247 * We must still dirty the buffer and write it back before the 248 * allocation transaction clears the log. Therefore, mark the buffer as 249 * ordered instead of logging it directly. This is safe for quotacheck 250 * because it detects and repairs allocated but initialized dquot blocks 251 * in the quota inodes. 252 */ 253 if (!(mp->m_qflags & qflag)) 254 xfs_trans_ordered_buf(tp, bp); 255 else 256 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1); 257 } 258 259 /* 260 * Initialize the dynamic speculative preallocation thresholds. The lo/hi 261 * watermarks correspond to the soft and hard limits by default. If a soft limit 262 * is not specified, we use 95% of the hard limit. 263 */ 264 void 265 xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp) 266 { 267 uint64_t space; 268 269 dqp->q_prealloc_hi_wmark = dqp->q_blk.hardlimit; 270 dqp->q_prealloc_lo_wmark = dqp->q_blk.softlimit; 271 if (!dqp->q_prealloc_lo_wmark) { 272 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark; 273 do_div(dqp->q_prealloc_lo_wmark, 100); 274 dqp->q_prealloc_lo_wmark *= 95; 275 } 276 277 space = dqp->q_prealloc_hi_wmark; 278 279 do_div(space, 100); 280 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space; 281 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3; 282 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5; 283 } 284 285 /* 286 * Ensure that the given in-core dquot has a buffer on disk backing it, and 287 * return the buffer locked and held. This is called when the bmapi finds a 288 * hole. 289 */ 290 STATIC int 291 xfs_dquot_disk_alloc( 292 struct xfs_dquot *dqp, 293 struct xfs_buf **bpp) 294 { 295 struct xfs_bmbt_irec map; 296 struct xfs_trans *tp; 297 struct xfs_mount *mp = dqp->q_mount; 298 struct xfs_buf *bp; 299 xfs_dqtype_t qtype = xfs_dquot_type(dqp); 300 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype); 301 int nmaps = 1; 302 int error; 303 304 trace_xfs_dqalloc(dqp); 305 306 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc, 307 XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp); 308 if (error) 309 return error; 310 311 xfs_ilock(quotip, XFS_ILOCK_EXCL); 312 xfs_trans_ijoin(tp, quotip, 0); 313 314 if (!xfs_this_quota_on(dqp->q_mount, qtype)) { 315 /* 316 * Return if this type of quotas is turned off while we didn't 317 * have an inode lock 318 */ 319 error = -ESRCH; 320 goto err_cancel; 321 } 322 323 error = xfs_iext_count_may_overflow(quotip, XFS_DATA_FORK, 324 XFS_IEXT_ADD_NOSPLIT_CNT); 325 if (error) 326 goto err_cancel; 327 328 /* Create the block mapping. */ 329 error = xfs_bmapi_write(tp, quotip, dqp->q_fileoffset, 330 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA, 0, &map, 331 &nmaps); 332 if (error) 333 goto err_cancel; 334 335 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB); 336 ASSERT(nmaps == 1); 337 ASSERT((map.br_startblock != DELAYSTARTBLOCK) && 338 (map.br_startblock != HOLESTARTBLOCK)); 339 340 /* 341 * Keep track of the blkno to save a lookup later 342 */ 343 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); 344 345 /* now we can just get the buffer (there's nothing to read yet) */ 346 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, dqp->q_blkno, 347 mp->m_quotainfo->qi_dqchunklen, 0, &bp); 348 if (error) 349 goto err_cancel; 350 bp->b_ops = &xfs_dquot_buf_ops; 351 352 /* 353 * Make a chunk of dquots out of this buffer and log 354 * the entire thing. 355 */ 356 xfs_qm_init_dquot_blk(tp, mp, dqp->q_id, qtype, bp); 357 xfs_buf_set_ref(bp, XFS_DQUOT_REF); 358 359 /* 360 * Hold the buffer and join it to the dfops so that we'll still own 361 * the buffer when we return to the caller. The buffer disposal on 362 * error must be paid attention to very carefully, as it has been 363 * broken since commit efa092f3d4c6 "[XFS] Fixes a bug in the quota 364 * code when allocating a new dquot record" in 2005, and the later 365 * conversion to xfs_defer_ops in commit 310a75a3c6c747 failed to keep 366 * the buffer locked across the _defer_finish call. We can now do 367 * this correctly with xfs_defer_bjoin. 368 * 369 * Above, we allocated a disk block for the dquot information and used 370 * get_buf to initialize the dquot. If the _defer_finish fails, the old 371 * transaction is gone but the new buffer is not joined or held to any 372 * transaction, so we must _buf_relse it. 373 * 374 * If everything succeeds, the caller of this function is returned a 375 * buffer that is locked and held to the transaction. The caller 376 * is responsible for unlocking any buffer passed back, either 377 * manually or by committing the transaction. On error, the buffer is 378 * released and not passed back. 379 * 380 * Keep the quota inode ILOCKed until after the transaction commit to 381 * maintain the atomicity of bmap/rmap updates. 382 */ 383 xfs_trans_bhold(tp, bp); 384 error = xfs_trans_commit(tp); 385 xfs_iunlock(quotip, XFS_ILOCK_EXCL); 386 if (error) { 387 xfs_buf_relse(bp); 388 return error; 389 } 390 391 *bpp = bp; 392 return 0; 393 394 err_cancel: 395 xfs_trans_cancel(tp); 396 xfs_iunlock(quotip, XFS_ILOCK_EXCL); 397 return error; 398 } 399 400 /* 401 * Read in the in-core dquot's on-disk metadata and return the buffer. 402 * Returns ENOENT to signal a hole. 403 */ 404 STATIC int 405 xfs_dquot_disk_read( 406 struct xfs_mount *mp, 407 struct xfs_dquot *dqp, 408 struct xfs_buf **bpp) 409 { 410 struct xfs_bmbt_irec map; 411 struct xfs_buf *bp; 412 xfs_dqtype_t qtype = xfs_dquot_type(dqp); 413 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype); 414 uint lock_mode; 415 int nmaps = 1; 416 int error; 417 418 lock_mode = xfs_ilock_data_map_shared(quotip); 419 if (!xfs_this_quota_on(mp, qtype)) { 420 /* 421 * Return if this type of quotas is turned off while we 422 * didn't have the quota inode lock. 423 */ 424 xfs_iunlock(quotip, lock_mode); 425 return -ESRCH; 426 } 427 428 /* 429 * Find the block map; no allocations yet 430 */ 431 error = xfs_bmapi_read(quotip, dqp->q_fileoffset, 432 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); 433 xfs_iunlock(quotip, lock_mode); 434 if (error) 435 return error; 436 437 ASSERT(nmaps == 1); 438 ASSERT(map.br_blockcount >= 1); 439 ASSERT(map.br_startblock != DELAYSTARTBLOCK); 440 if (map.br_startblock == HOLESTARTBLOCK) 441 return -ENOENT; 442 443 trace_xfs_dqtobp_read(dqp); 444 445 /* 446 * store the blkno etc so that we don't have to do the 447 * mapping all the time 448 */ 449 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); 450 451 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, 452 mp->m_quotainfo->qi_dqchunklen, 0, &bp, 453 &xfs_dquot_buf_ops); 454 if (error) { 455 ASSERT(bp == NULL); 456 return error; 457 } 458 459 ASSERT(xfs_buf_islocked(bp)); 460 xfs_buf_set_ref(bp, XFS_DQUOT_REF); 461 *bpp = bp; 462 463 return 0; 464 } 465 466 /* Allocate and initialize everything we need for an incore dquot. */ 467 STATIC struct xfs_dquot * 468 xfs_dquot_alloc( 469 struct xfs_mount *mp, 470 xfs_dqid_t id, 471 xfs_dqtype_t type) 472 { 473 struct xfs_dquot *dqp; 474 475 dqp = kmem_cache_zalloc(xfs_dquot_cache, GFP_KERNEL | __GFP_NOFAIL); 476 477 dqp->q_type = type; 478 dqp->q_id = id; 479 dqp->q_mount = mp; 480 INIT_LIST_HEAD(&dqp->q_lru); 481 mutex_init(&dqp->q_qlock); 482 init_waitqueue_head(&dqp->q_pinwait); 483 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; 484 /* 485 * Offset of dquot in the (fixed sized) dquot chunk. 486 */ 487 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * 488 sizeof(struct xfs_dqblk); 489 490 /* 491 * Because we want to use a counting completion, complete 492 * the flush completion once to allow a single access to 493 * the flush completion without blocking. 494 */ 495 init_completion(&dqp->q_flush); 496 complete(&dqp->q_flush); 497 498 /* 499 * Make sure group quotas have a different lock class than user 500 * quotas. 501 */ 502 switch (type) { 503 case XFS_DQTYPE_USER: 504 /* uses the default lock class */ 505 break; 506 case XFS_DQTYPE_GROUP: 507 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class); 508 break; 509 case XFS_DQTYPE_PROJ: 510 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class); 511 break; 512 default: 513 ASSERT(0); 514 break; 515 } 516 517 xfs_qm_dquot_logitem_init(dqp); 518 519 XFS_STATS_INC(mp, xs_qm_dquot); 520 return dqp; 521 } 522 523 /* Check the ondisk dquot's id and type match what the incore dquot expects. */ 524 static bool 525 xfs_dquot_check_type( 526 struct xfs_dquot *dqp, 527 struct xfs_disk_dquot *ddqp) 528 { 529 uint8_t ddqp_type; 530 uint8_t dqp_type; 531 532 ddqp_type = ddqp->d_type & XFS_DQTYPE_REC_MASK; 533 dqp_type = xfs_dquot_type(dqp); 534 535 if (be32_to_cpu(ddqp->d_id) != dqp->q_id) 536 return false; 537 538 /* 539 * V5 filesystems always expect an exact type match. V4 filesystems 540 * expect an exact match for user dquots and for non-root group and 541 * project dquots. 542 */ 543 if (xfs_has_crc(dqp->q_mount) || 544 dqp_type == XFS_DQTYPE_USER || dqp->q_id != 0) 545 return ddqp_type == dqp_type; 546 547 /* 548 * V4 filesystems support either group or project quotas, but not both 549 * at the same time. The non-user quota file can be switched between 550 * group and project quota uses depending on the mount options, which 551 * means that we can encounter the other type when we try to load quota 552 * defaults. Quotacheck will soon reset the the entire quota file 553 * (including the root dquot) anyway, but don't log scary corruption 554 * reports to dmesg. 555 */ 556 return ddqp_type == XFS_DQTYPE_GROUP || ddqp_type == XFS_DQTYPE_PROJ; 557 } 558 559 /* Copy the in-core quota fields in from the on-disk buffer. */ 560 STATIC int 561 xfs_dquot_from_disk( 562 struct xfs_dquot *dqp, 563 struct xfs_buf *bp) 564 { 565 struct xfs_disk_dquot *ddqp = bp->b_addr + dqp->q_bufoffset; 566 567 /* 568 * Ensure that we got the type and ID we were looking for. 569 * Everything else was checked by the dquot buffer verifier. 570 */ 571 if (!xfs_dquot_check_type(dqp, ddqp)) { 572 xfs_alert_tag(bp->b_mount, XFS_PTAG_VERIFIER_ERROR, 573 "Metadata corruption detected at %pS, quota %u", 574 __this_address, dqp->q_id); 575 xfs_alert(bp->b_mount, "Unmount and run xfs_repair"); 576 return -EFSCORRUPTED; 577 } 578 579 /* copy everything from disk dquot to the incore dquot */ 580 dqp->q_type = ddqp->d_type; 581 dqp->q_blk.hardlimit = be64_to_cpu(ddqp->d_blk_hardlimit); 582 dqp->q_blk.softlimit = be64_to_cpu(ddqp->d_blk_softlimit); 583 dqp->q_ino.hardlimit = be64_to_cpu(ddqp->d_ino_hardlimit); 584 dqp->q_ino.softlimit = be64_to_cpu(ddqp->d_ino_softlimit); 585 dqp->q_rtb.hardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit); 586 dqp->q_rtb.softlimit = be64_to_cpu(ddqp->d_rtb_softlimit); 587 588 dqp->q_blk.count = be64_to_cpu(ddqp->d_bcount); 589 dqp->q_ino.count = be64_to_cpu(ddqp->d_icount); 590 dqp->q_rtb.count = be64_to_cpu(ddqp->d_rtbcount); 591 592 dqp->q_blk.warnings = be16_to_cpu(ddqp->d_bwarns); 593 dqp->q_ino.warnings = be16_to_cpu(ddqp->d_iwarns); 594 dqp->q_rtb.warnings = be16_to_cpu(ddqp->d_rtbwarns); 595 596 dqp->q_blk.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_btimer); 597 dqp->q_ino.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_itimer); 598 dqp->q_rtb.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_rtbtimer); 599 600 /* 601 * Reservation counters are defined as reservation plus current usage 602 * to avoid having to add every time. 603 */ 604 dqp->q_blk.reserved = dqp->q_blk.count; 605 dqp->q_ino.reserved = dqp->q_ino.count; 606 dqp->q_rtb.reserved = dqp->q_rtb.count; 607 608 /* initialize the dquot speculative prealloc thresholds */ 609 xfs_dquot_set_prealloc_limits(dqp); 610 return 0; 611 } 612 613 /* Copy the in-core quota fields into the on-disk buffer. */ 614 void 615 xfs_dquot_to_disk( 616 struct xfs_disk_dquot *ddqp, 617 struct xfs_dquot *dqp) 618 { 619 ddqp->d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 620 ddqp->d_version = XFS_DQUOT_VERSION; 621 ddqp->d_type = dqp->q_type; 622 ddqp->d_id = cpu_to_be32(dqp->q_id); 623 ddqp->d_pad0 = 0; 624 ddqp->d_pad = 0; 625 626 ddqp->d_blk_hardlimit = cpu_to_be64(dqp->q_blk.hardlimit); 627 ddqp->d_blk_softlimit = cpu_to_be64(dqp->q_blk.softlimit); 628 ddqp->d_ino_hardlimit = cpu_to_be64(dqp->q_ino.hardlimit); 629 ddqp->d_ino_softlimit = cpu_to_be64(dqp->q_ino.softlimit); 630 ddqp->d_rtb_hardlimit = cpu_to_be64(dqp->q_rtb.hardlimit); 631 ddqp->d_rtb_softlimit = cpu_to_be64(dqp->q_rtb.softlimit); 632 633 ddqp->d_bcount = cpu_to_be64(dqp->q_blk.count); 634 ddqp->d_icount = cpu_to_be64(dqp->q_ino.count); 635 ddqp->d_rtbcount = cpu_to_be64(dqp->q_rtb.count); 636 637 ddqp->d_bwarns = cpu_to_be16(dqp->q_blk.warnings); 638 ddqp->d_iwarns = cpu_to_be16(dqp->q_ino.warnings); 639 ddqp->d_rtbwarns = cpu_to_be16(dqp->q_rtb.warnings); 640 641 ddqp->d_btimer = xfs_dquot_to_disk_ts(dqp, dqp->q_blk.timer); 642 ddqp->d_itimer = xfs_dquot_to_disk_ts(dqp, dqp->q_ino.timer); 643 ddqp->d_rtbtimer = xfs_dquot_to_disk_ts(dqp, dqp->q_rtb.timer); 644 } 645 646 /* 647 * Read in the ondisk dquot using dqtobp() then copy it to an incore version, 648 * and release the buffer immediately. If @can_alloc is true, fill any 649 * holes in the on-disk metadata. 650 */ 651 static int 652 xfs_qm_dqread( 653 struct xfs_mount *mp, 654 xfs_dqid_t id, 655 xfs_dqtype_t type, 656 bool can_alloc, 657 struct xfs_dquot **dqpp) 658 { 659 struct xfs_dquot *dqp; 660 struct xfs_buf *bp; 661 int error; 662 663 dqp = xfs_dquot_alloc(mp, id, type); 664 trace_xfs_dqread(dqp); 665 666 /* Try to read the buffer, allocating if necessary. */ 667 error = xfs_dquot_disk_read(mp, dqp, &bp); 668 if (error == -ENOENT && can_alloc) 669 error = xfs_dquot_disk_alloc(dqp, &bp); 670 if (error) 671 goto err; 672 673 /* 674 * At this point we should have a clean locked buffer. Copy the data 675 * to the incore dquot and release the buffer since the incore dquot 676 * has its own locking protocol so we needn't tie up the buffer any 677 * further. 678 */ 679 ASSERT(xfs_buf_islocked(bp)); 680 error = xfs_dquot_from_disk(dqp, bp); 681 xfs_buf_relse(bp); 682 if (error) 683 goto err; 684 685 *dqpp = dqp; 686 return error; 687 688 err: 689 trace_xfs_dqread_fail(dqp); 690 xfs_qm_dqdestroy(dqp); 691 *dqpp = NULL; 692 return error; 693 } 694 695 /* 696 * Advance to the next id in the current chunk, or if at the 697 * end of the chunk, skip ahead to first id in next allocated chunk 698 * using the SEEK_DATA interface. 699 */ 700 static int 701 xfs_dq_get_next_id( 702 struct xfs_mount *mp, 703 xfs_dqtype_t type, 704 xfs_dqid_t *id) 705 { 706 struct xfs_inode *quotip = xfs_quota_inode(mp, type); 707 xfs_dqid_t next_id = *id + 1; /* simple advance */ 708 uint lock_flags; 709 struct xfs_bmbt_irec got; 710 struct xfs_iext_cursor cur; 711 xfs_fsblock_t start; 712 int error = 0; 713 714 /* If we'd wrap past the max ID, stop */ 715 if (next_id < *id) 716 return -ENOENT; 717 718 /* If new ID is within the current chunk, advancing it sufficed */ 719 if (next_id % mp->m_quotainfo->qi_dqperchunk) { 720 *id = next_id; 721 return 0; 722 } 723 724 /* Nope, next_id is now past the current chunk, so find the next one */ 725 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk; 726 727 lock_flags = xfs_ilock_data_map_shared(quotip); 728 error = xfs_iread_extents(NULL, quotip, XFS_DATA_FORK); 729 if (error) 730 return error; 731 732 if (xfs_iext_lookup_extent(quotip, "ip->i_df, start, &cur, &got)) { 733 /* contiguous chunk, bump startoff for the id calculation */ 734 if (got.br_startoff < start) 735 got.br_startoff = start; 736 *id = got.br_startoff * mp->m_quotainfo->qi_dqperchunk; 737 } else { 738 error = -ENOENT; 739 } 740 741 xfs_iunlock(quotip, lock_flags); 742 743 return error; 744 } 745 746 /* 747 * Look up the dquot in the in-core cache. If found, the dquot is returned 748 * locked and ready to go. 749 */ 750 static struct xfs_dquot * 751 xfs_qm_dqget_cache_lookup( 752 struct xfs_mount *mp, 753 struct xfs_quotainfo *qi, 754 struct radix_tree_root *tree, 755 xfs_dqid_t id) 756 { 757 struct xfs_dquot *dqp; 758 759 restart: 760 mutex_lock(&qi->qi_tree_lock); 761 dqp = radix_tree_lookup(tree, id); 762 if (!dqp) { 763 mutex_unlock(&qi->qi_tree_lock); 764 XFS_STATS_INC(mp, xs_qm_dqcachemisses); 765 return NULL; 766 } 767 768 xfs_dqlock(dqp); 769 if (dqp->q_flags & XFS_DQFLAG_FREEING) { 770 xfs_dqunlock(dqp); 771 mutex_unlock(&qi->qi_tree_lock); 772 trace_xfs_dqget_freeing(dqp); 773 delay(1); 774 goto restart; 775 } 776 777 dqp->q_nrefs++; 778 mutex_unlock(&qi->qi_tree_lock); 779 780 trace_xfs_dqget_hit(dqp); 781 XFS_STATS_INC(mp, xs_qm_dqcachehits); 782 return dqp; 783 } 784 785 /* 786 * Try to insert a new dquot into the in-core cache. If an error occurs the 787 * caller should throw away the dquot and start over. Otherwise, the dquot 788 * is returned locked (and held by the cache) as if there had been a cache 789 * hit. 790 */ 791 static int 792 xfs_qm_dqget_cache_insert( 793 struct xfs_mount *mp, 794 struct xfs_quotainfo *qi, 795 struct radix_tree_root *tree, 796 xfs_dqid_t id, 797 struct xfs_dquot *dqp) 798 { 799 int error; 800 801 mutex_lock(&qi->qi_tree_lock); 802 error = radix_tree_insert(tree, id, dqp); 803 if (unlikely(error)) { 804 /* Duplicate found! Caller must try again. */ 805 WARN_ON(error != -EEXIST); 806 mutex_unlock(&qi->qi_tree_lock); 807 trace_xfs_dqget_dup(dqp); 808 return error; 809 } 810 811 /* Return a locked dquot to the caller, with a reference taken. */ 812 xfs_dqlock(dqp); 813 dqp->q_nrefs = 1; 814 815 qi->qi_dquots++; 816 mutex_unlock(&qi->qi_tree_lock); 817 818 return 0; 819 } 820 821 /* Check our input parameters. */ 822 static int 823 xfs_qm_dqget_checks( 824 struct xfs_mount *mp, 825 xfs_dqtype_t type) 826 { 827 switch (type) { 828 case XFS_DQTYPE_USER: 829 if (!XFS_IS_UQUOTA_ON(mp)) 830 return -ESRCH; 831 return 0; 832 case XFS_DQTYPE_GROUP: 833 if (!XFS_IS_GQUOTA_ON(mp)) 834 return -ESRCH; 835 return 0; 836 case XFS_DQTYPE_PROJ: 837 if (!XFS_IS_PQUOTA_ON(mp)) 838 return -ESRCH; 839 return 0; 840 default: 841 WARN_ON_ONCE(0); 842 return -EINVAL; 843 } 844 } 845 846 /* 847 * Given the file system, id, and type (UDQUOT/GDQUOT/PDQUOT), return a 848 * locked dquot, doing an allocation (if requested) as needed. 849 */ 850 int 851 xfs_qm_dqget( 852 struct xfs_mount *mp, 853 xfs_dqid_t id, 854 xfs_dqtype_t type, 855 bool can_alloc, 856 struct xfs_dquot **O_dqpp) 857 { 858 struct xfs_quotainfo *qi = mp->m_quotainfo; 859 struct radix_tree_root *tree = xfs_dquot_tree(qi, type); 860 struct xfs_dquot *dqp; 861 int error; 862 863 error = xfs_qm_dqget_checks(mp, type); 864 if (error) 865 return error; 866 867 restart: 868 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id); 869 if (dqp) { 870 *O_dqpp = dqp; 871 return 0; 872 } 873 874 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp); 875 if (error) 876 return error; 877 878 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp); 879 if (error) { 880 /* 881 * Duplicate found. Just throw away the new dquot and start 882 * over. 883 */ 884 xfs_qm_dqdestroy(dqp); 885 XFS_STATS_INC(mp, xs_qm_dquot_dups); 886 goto restart; 887 } 888 889 trace_xfs_dqget_miss(dqp); 890 *O_dqpp = dqp; 891 return 0; 892 } 893 894 /* 895 * Given a dquot id and type, read and initialize a dquot from the on-disk 896 * metadata. This function is only for use during quota initialization so 897 * it ignores the dquot cache assuming that the dquot shrinker isn't set up. 898 * The caller is responsible for _qm_dqdestroy'ing the returned dquot. 899 */ 900 int 901 xfs_qm_dqget_uncached( 902 struct xfs_mount *mp, 903 xfs_dqid_t id, 904 xfs_dqtype_t type, 905 struct xfs_dquot **dqpp) 906 { 907 int error; 908 909 error = xfs_qm_dqget_checks(mp, type); 910 if (error) 911 return error; 912 913 return xfs_qm_dqread(mp, id, type, 0, dqpp); 914 } 915 916 /* Return the quota id for a given inode and type. */ 917 xfs_dqid_t 918 xfs_qm_id_for_quotatype( 919 struct xfs_inode *ip, 920 xfs_dqtype_t type) 921 { 922 switch (type) { 923 case XFS_DQTYPE_USER: 924 return i_uid_read(VFS_I(ip)); 925 case XFS_DQTYPE_GROUP: 926 return i_gid_read(VFS_I(ip)); 927 case XFS_DQTYPE_PROJ: 928 return ip->i_projid; 929 } 930 ASSERT(0); 931 return 0; 932 } 933 934 /* 935 * Return the dquot for a given inode and type. If @can_alloc is true, then 936 * allocate blocks if needed. The inode's ILOCK must be held and it must not 937 * have already had an inode attached. 938 */ 939 int 940 xfs_qm_dqget_inode( 941 struct xfs_inode *ip, 942 xfs_dqtype_t type, 943 bool can_alloc, 944 struct xfs_dquot **O_dqpp) 945 { 946 struct xfs_mount *mp = ip->i_mount; 947 struct xfs_quotainfo *qi = mp->m_quotainfo; 948 struct radix_tree_root *tree = xfs_dquot_tree(qi, type); 949 struct xfs_dquot *dqp; 950 xfs_dqid_t id; 951 int error; 952 953 error = xfs_qm_dqget_checks(mp, type); 954 if (error) 955 return error; 956 957 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 958 ASSERT(xfs_inode_dquot(ip, type) == NULL); 959 960 id = xfs_qm_id_for_quotatype(ip, type); 961 962 restart: 963 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id); 964 if (dqp) { 965 *O_dqpp = dqp; 966 return 0; 967 } 968 969 /* 970 * Dquot cache miss. We don't want to keep the inode lock across 971 * a (potential) disk read. Also we don't want to deal with the lock 972 * ordering between quotainode and this inode. OTOH, dropping the inode 973 * lock here means dealing with a chown that can happen before 974 * we re-acquire the lock. 975 */ 976 xfs_iunlock(ip, XFS_ILOCK_EXCL); 977 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp); 978 xfs_ilock(ip, XFS_ILOCK_EXCL); 979 if (error) 980 return error; 981 982 /* 983 * A dquot could be attached to this inode by now, since we had 984 * dropped the ilock. 985 */ 986 if (xfs_this_quota_on(mp, type)) { 987 struct xfs_dquot *dqp1; 988 989 dqp1 = xfs_inode_dquot(ip, type); 990 if (dqp1) { 991 xfs_qm_dqdestroy(dqp); 992 dqp = dqp1; 993 xfs_dqlock(dqp); 994 goto dqret; 995 } 996 } else { 997 /* inode stays locked on return */ 998 xfs_qm_dqdestroy(dqp); 999 return -ESRCH; 1000 } 1001 1002 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp); 1003 if (error) { 1004 /* 1005 * Duplicate found. Just throw away the new dquot and start 1006 * over. 1007 */ 1008 xfs_qm_dqdestroy(dqp); 1009 XFS_STATS_INC(mp, xs_qm_dquot_dups); 1010 goto restart; 1011 } 1012 1013 dqret: 1014 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 1015 trace_xfs_dqget_miss(dqp); 1016 *O_dqpp = dqp; 1017 return 0; 1018 } 1019 1020 /* 1021 * Starting at @id and progressing upwards, look for an initialized incore 1022 * dquot, lock it, and return it. 1023 */ 1024 int 1025 xfs_qm_dqget_next( 1026 struct xfs_mount *mp, 1027 xfs_dqid_t id, 1028 xfs_dqtype_t type, 1029 struct xfs_dquot **dqpp) 1030 { 1031 struct xfs_dquot *dqp; 1032 int error = 0; 1033 1034 *dqpp = NULL; 1035 for (; !error; error = xfs_dq_get_next_id(mp, type, &id)) { 1036 error = xfs_qm_dqget(mp, id, type, false, &dqp); 1037 if (error == -ENOENT) 1038 continue; 1039 else if (error != 0) 1040 break; 1041 1042 if (!XFS_IS_DQUOT_UNINITIALIZED(dqp)) { 1043 *dqpp = dqp; 1044 return 0; 1045 } 1046 1047 xfs_qm_dqput(dqp); 1048 } 1049 1050 return error; 1051 } 1052 1053 /* 1054 * Release a reference to the dquot (decrement ref-count) and unlock it. 1055 * 1056 * If there is a group quota attached to this dquot, carefully release that 1057 * too without tripping over deadlocks'n'stuff. 1058 */ 1059 void 1060 xfs_qm_dqput( 1061 struct xfs_dquot *dqp) 1062 { 1063 ASSERT(dqp->q_nrefs > 0); 1064 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 1065 1066 trace_xfs_dqput(dqp); 1067 1068 if (--dqp->q_nrefs == 0) { 1069 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo; 1070 trace_xfs_dqput_free(dqp); 1071 1072 if (list_lru_add(&qi->qi_lru, &dqp->q_lru)) 1073 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused); 1074 } 1075 xfs_dqunlock(dqp); 1076 } 1077 1078 /* 1079 * Release a dquot. Flush it if dirty, then dqput() it. 1080 * dquot must not be locked. 1081 */ 1082 void 1083 xfs_qm_dqrele( 1084 struct xfs_dquot *dqp) 1085 { 1086 if (!dqp) 1087 return; 1088 1089 trace_xfs_dqrele(dqp); 1090 1091 xfs_dqlock(dqp); 1092 /* 1093 * We don't care to flush it if the dquot is dirty here. 1094 * That will create stutters that we want to avoid. 1095 * Instead we do a delayed write when we try to reclaim 1096 * a dirty dquot. Also xfs_sync will take part of the burden... 1097 */ 1098 xfs_qm_dqput(dqp); 1099 } 1100 1101 /* 1102 * This is the dquot flushing I/O completion routine. It is called 1103 * from interrupt level when the buffer containing the dquot is 1104 * flushed to disk. It is responsible for removing the dquot logitem 1105 * from the AIL if it has not been re-logged, and unlocking the dquot's 1106 * flush lock. This behavior is very similar to that of inodes.. 1107 */ 1108 static void 1109 xfs_qm_dqflush_done( 1110 struct xfs_log_item *lip) 1111 { 1112 struct xfs_dq_logitem *qip = (struct xfs_dq_logitem *)lip; 1113 struct xfs_dquot *dqp = qip->qli_dquot; 1114 struct xfs_ail *ailp = lip->li_ailp; 1115 xfs_lsn_t tail_lsn; 1116 1117 /* 1118 * We only want to pull the item from the AIL if its 1119 * location in the log has not changed since we started the flush. 1120 * Thus, we only bother if the dquot's lsn has 1121 * not changed. First we check the lsn outside the lock 1122 * since it's cheaper, and then we recheck while 1123 * holding the lock before removing the dquot from the AIL. 1124 */ 1125 if (test_bit(XFS_LI_IN_AIL, &lip->li_flags) && 1126 ((lip->li_lsn == qip->qli_flush_lsn) || 1127 test_bit(XFS_LI_FAILED, &lip->li_flags))) { 1128 1129 spin_lock(&ailp->ail_lock); 1130 xfs_clear_li_failed(lip); 1131 if (lip->li_lsn == qip->qli_flush_lsn) { 1132 /* xfs_ail_update_finish() drops the AIL lock */ 1133 tail_lsn = xfs_ail_delete_one(ailp, lip); 1134 xfs_ail_update_finish(ailp, tail_lsn); 1135 } else { 1136 spin_unlock(&ailp->ail_lock); 1137 } 1138 } 1139 1140 /* 1141 * Release the dq's flush lock since we're done with it. 1142 */ 1143 xfs_dqfunlock(dqp); 1144 } 1145 1146 void 1147 xfs_buf_dquot_iodone( 1148 struct xfs_buf *bp) 1149 { 1150 struct xfs_log_item *lip, *n; 1151 1152 list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) { 1153 list_del_init(&lip->li_bio_list); 1154 xfs_qm_dqflush_done(lip); 1155 } 1156 } 1157 1158 void 1159 xfs_buf_dquot_io_fail( 1160 struct xfs_buf *bp) 1161 { 1162 struct xfs_log_item *lip; 1163 1164 spin_lock(&bp->b_mount->m_ail->ail_lock); 1165 list_for_each_entry(lip, &bp->b_li_list, li_bio_list) 1166 xfs_set_li_failed(lip, bp); 1167 spin_unlock(&bp->b_mount->m_ail->ail_lock); 1168 } 1169 1170 /* Check incore dquot for errors before we flush. */ 1171 static xfs_failaddr_t 1172 xfs_qm_dqflush_check( 1173 struct xfs_dquot *dqp) 1174 { 1175 xfs_dqtype_t type = xfs_dquot_type(dqp); 1176 1177 if (type != XFS_DQTYPE_USER && 1178 type != XFS_DQTYPE_GROUP && 1179 type != XFS_DQTYPE_PROJ) 1180 return __this_address; 1181 1182 if (dqp->q_id == 0) 1183 return NULL; 1184 1185 if (dqp->q_blk.softlimit && dqp->q_blk.count > dqp->q_blk.softlimit && 1186 !dqp->q_blk.timer) 1187 return __this_address; 1188 1189 if (dqp->q_ino.softlimit && dqp->q_ino.count > dqp->q_ino.softlimit && 1190 !dqp->q_ino.timer) 1191 return __this_address; 1192 1193 if (dqp->q_rtb.softlimit && dqp->q_rtb.count > dqp->q_rtb.softlimit && 1194 !dqp->q_rtb.timer) 1195 return __this_address; 1196 1197 /* bigtime flag should never be set on root dquots */ 1198 if (dqp->q_type & XFS_DQTYPE_BIGTIME) { 1199 if (!xfs_has_bigtime(dqp->q_mount)) 1200 return __this_address; 1201 if (dqp->q_id == 0) 1202 return __this_address; 1203 } 1204 1205 return NULL; 1206 } 1207 1208 /* 1209 * Write a modified dquot to disk. 1210 * The dquot must be locked and the flush lock too taken by caller. 1211 * The flush lock will not be unlocked until the dquot reaches the disk, 1212 * but the dquot is free to be unlocked and modified by the caller 1213 * in the interim. Dquot is still locked on return. This behavior is 1214 * identical to that of inodes. 1215 */ 1216 int 1217 xfs_qm_dqflush( 1218 struct xfs_dquot *dqp, 1219 struct xfs_buf **bpp) 1220 { 1221 struct xfs_mount *mp = dqp->q_mount; 1222 struct xfs_log_item *lip = &dqp->q_logitem.qli_item; 1223 struct xfs_buf *bp; 1224 struct xfs_dqblk *dqblk; 1225 xfs_failaddr_t fa; 1226 int error; 1227 1228 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 1229 ASSERT(!completion_done(&dqp->q_flush)); 1230 1231 trace_xfs_dqflush(dqp); 1232 1233 *bpp = NULL; 1234 1235 xfs_qm_dqunpin_wait(dqp); 1236 1237 /* 1238 * Get the buffer containing the on-disk dquot 1239 */ 1240 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, 1241 mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK, 1242 &bp, &xfs_dquot_buf_ops); 1243 if (error == -EAGAIN) 1244 goto out_unlock; 1245 if (error) 1246 goto out_abort; 1247 1248 fa = xfs_qm_dqflush_check(dqp); 1249 if (fa) { 1250 xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS", 1251 dqp->q_id, fa); 1252 xfs_buf_relse(bp); 1253 error = -EFSCORRUPTED; 1254 goto out_abort; 1255 } 1256 1257 /* Flush the incore dquot to the ondisk buffer. */ 1258 dqblk = bp->b_addr + dqp->q_bufoffset; 1259 xfs_dquot_to_disk(&dqblk->dd_diskdq, dqp); 1260 1261 /* 1262 * Clear the dirty field and remember the flush lsn for later use. 1263 */ 1264 dqp->q_flags &= ~XFS_DQFLAG_DIRTY; 1265 1266 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn, 1267 &dqp->q_logitem.qli_item.li_lsn); 1268 1269 /* 1270 * copy the lsn into the on-disk dquot now while we have the in memory 1271 * dquot here. This can't be done later in the write verifier as we 1272 * can't get access to the log item at that point in time. 1273 * 1274 * We also calculate the CRC here so that the on-disk dquot in the 1275 * buffer always has a valid CRC. This ensures there is no possibility 1276 * of a dquot without an up-to-date CRC getting to disk. 1277 */ 1278 if (xfs_has_crc(mp)) { 1279 dqblk->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn); 1280 xfs_update_cksum((char *)dqblk, sizeof(struct xfs_dqblk), 1281 XFS_DQUOT_CRC_OFF); 1282 } 1283 1284 /* 1285 * Attach the dquot to the buffer so that we can remove this dquot from 1286 * the AIL and release the flush lock once the dquot is synced to disk. 1287 */ 1288 bp->b_flags |= _XBF_DQUOTS; 1289 list_add_tail(&dqp->q_logitem.qli_item.li_bio_list, &bp->b_li_list); 1290 1291 /* 1292 * If the buffer is pinned then push on the log so we won't 1293 * get stuck waiting in the write for too long. 1294 */ 1295 if (xfs_buf_ispinned(bp)) { 1296 trace_xfs_dqflush_force(dqp); 1297 xfs_log_force(mp, 0); 1298 } 1299 1300 trace_xfs_dqflush_done(dqp); 1301 *bpp = bp; 1302 return 0; 1303 1304 out_abort: 1305 dqp->q_flags &= ~XFS_DQFLAG_DIRTY; 1306 xfs_trans_ail_delete(lip, 0); 1307 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1308 out_unlock: 1309 xfs_dqfunlock(dqp); 1310 return error; 1311 } 1312 1313 /* 1314 * Lock two xfs_dquot structures. 1315 * 1316 * To avoid deadlocks we always lock the quota structure with 1317 * the lowerd id first. 1318 */ 1319 void 1320 xfs_dqlock2( 1321 struct xfs_dquot *d1, 1322 struct xfs_dquot *d2) 1323 { 1324 if (d1 && d2) { 1325 ASSERT(d1 != d2); 1326 if (d1->q_id > d2->q_id) { 1327 mutex_lock(&d2->q_qlock); 1328 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED); 1329 } else { 1330 mutex_lock(&d1->q_qlock); 1331 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED); 1332 } 1333 } else if (d1) { 1334 mutex_lock(&d1->q_qlock); 1335 } else if (d2) { 1336 mutex_lock(&d2->q_qlock); 1337 } 1338 } 1339 1340 int __init 1341 xfs_qm_init(void) 1342 { 1343 xfs_dquot_cache = kmem_cache_create("xfs_dquot", 1344 sizeof(struct xfs_dquot), 1345 0, 0, NULL); 1346 if (!xfs_dquot_cache) 1347 goto out; 1348 1349 xfs_dqtrx_cache = kmem_cache_create("xfs_dqtrx", 1350 sizeof(struct xfs_dquot_acct), 1351 0, 0, NULL); 1352 if (!xfs_dqtrx_cache) 1353 goto out_free_dquot_cache; 1354 1355 return 0; 1356 1357 out_free_dquot_cache: 1358 kmem_cache_destroy(xfs_dquot_cache); 1359 out: 1360 return -ENOMEM; 1361 } 1362 1363 void 1364 xfs_qm_exit(void) 1365 { 1366 kmem_cache_destroy(xfs_dqtrx_cache); 1367 kmem_cache_destroy(xfs_dquot_cache); 1368 } 1369 1370 /* 1371 * Iterate every dquot of a particular type. The caller must ensure that the 1372 * particular quota type is active. iter_fn can return negative error codes, 1373 * or -ECANCELED to indicate that it wants to stop iterating. 1374 */ 1375 int 1376 xfs_qm_dqiterate( 1377 struct xfs_mount *mp, 1378 xfs_dqtype_t type, 1379 xfs_qm_dqiterate_fn iter_fn, 1380 void *priv) 1381 { 1382 struct xfs_dquot *dq; 1383 xfs_dqid_t id = 0; 1384 int error; 1385 1386 do { 1387 error = xfs_qm_dqget_next(mp, id, type, &dq); 1388 if (error == -ENOENT) 1389 return 0; 1390 if (error) 1391 return error; 1392 1393 error = iter_fn(dq, type, priv); 1394 id = dq->q_id; 1395 xfs_qm_dqput(dq); 1396 } while (error == 0 && id != 0); 1397 1398 return error; 1399 } 1400