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_trans **tpp, 293 struct xfs_dquot *dqp, 294 struct xfs_buf **bpp) 295 { 296 struct xfs_bmbt_irec map; 297 struct xfs_trans *tp = *tpp; 298 struct xfs_mount *mp = tp->t_mountp; 299 struct xfs_buf *bp; 300 xfs_dqtype_t qtype = xfs_dquot_type(dqp); 301 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype); 302 int nmaps = 1; 303 int error; 304 305 trace_xfs_dqalloc(dqp); 306 307 xfs_ilock(quotip, XFS_ILOCK_EXCL); 308 if (!xfs_this_quota_on(dqp->q_mount, qtype)) { 309 /* 310 * Return if this type of quotas is turned off while we didn't 311 * have an inode lock 312 */ 313 xfs_iunlock(quotip, XFS_ILOCK_EXCL); 314 return -ESRCH; 315 } 316 317 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL); 318 319 error = xfs_iext_count_may_overflow(quotip, XFS_DATA_FORK, 320 XFS_IEXT_ADD_NOSPLIT_CNT); 321 if (error) 322 return error; 323 324 /* Create the block mapping. */ 325 error = xfs_bmapi_write(tp, quotip, dqp->q_fileoffset, 326 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA, 0, &map, 327 &nmaps); 328 if (error) 329 return error; 330 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB); 331 ASSERT(nmaps == 1); 332 ASSERT((map.br_startblock != DELAYSTARTBLOCK) && 333 (map.br_startblock != HOLESTARTBLOCK)); 334 335 /* 336 * Keep track of the blkno to save a lookup later 337 */ 338 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); 339 340 /* now we can just get the buffer (there's nothing to read yet) */ 341 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, dqp->q_blkno, 342 mp->m_quotainfo->qi_dqchunklen, 0, &bp); 343 if (error) 344 return error; 345 bp->b_ops = &xfs_dquot_buf_ops; 346 347 /* 348 * Make a chunk of dquots out of this buffer and log 349 * the entire thing. 350 */ 351 xfs_qm_init_dquot_blk(tp, mp, dqp->q_id, qtype, bp); 352 xfs_buf_set_ref(bp, XFS_DQUOT_REF); 353 354 /* 355 * Hold the buffer and join it to the dfops so that we'll still own 356 * the buffer when we return to the caller. The buffer disposal on 357 * error must be paid attention to very carefully, as it has been 358 * broken since commit efa092f3d4c6 "[XFS] Fixes a bug in the quota 359 * code when allocating a new dquot record" in 2005, and the later 360 * conversion to xfs_defer_ops in commit 310a75a3c6c747 failed to keep 361 * the buffer locked across the _defer_finish call. We can now do 362 * this correctly with xfs_defer_bjoin. 363 * 364 * Above, we allocated a disk block for the dquot information and used 365 * get_buf to initialize the dquot. If the _defer_finish fails, the old 366 * transaction is gone but the new buffer is not joined or held to any 367 * transaction, so we must _buf_relse it. 368 * 369 * If everything succeeds, the caller of this function is returned a 370 * buffer that is locked and held to the transaction. The caller 371 * is responsible for unlocking any buffer passed back, either 372 * manually or by committing the transaction. On error, the buffer is 373 * released and not passed back. 374 */ 375 xfs_trans_bhold(tp, bp); 376 error = xfs_defer_finish(tpp); 377 if (error) { 378 xfs_trans_bhold_release(*tpp, bp); 379 xfs_trans_brelse(*tpp, bp); 380 return error; 381 } 382 *bpp = bp; 383 return 0; 384 } 385 386 /* 387 * Read in the in-core dquot's on-disk metadata and return the buffer. 388 * Returns ENOENT to signal a hole. 389 */ 390 STATIC int 391 xfs_dquot_disk_read( 392 struct xfs_mount *mp, 393 struct xfs_dquot *dqp, 394 struct xfs_buf **bpp) 395 { 396 struct xfs_bmbt_irec map; 397 struct xfs_buf *bp; 398 xfs_dqtype_t qtype = xfs_dquot_type(dqp); 399 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype); 400 uint lock_mode; 401 int nmaps = 1; 402 int error; 403 404 lock_mode = xfs_ilock_data_map_shared(quotip); 405 if (!xfs_this_quota_on(mp, qtype)) { 406 /* 407 * Return if this type of quotas is turned off while we 408 * didn't have the quota inode lock. 409 */ 410 xfs_iunlock(quotip, lock_mode); 411 return -ESRCH; 412 } 413 414 /* 415 * Find the block map; no allocations yet 416 */ 417 error = xfs_bmapi_read(quotip, dqp->q_fileoffset, 418 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); 419 xfs_iunlock(quotip, lock_mode); 420 if (error) 421 return error; 422 423 ASSERT(nmaps == 1); 424 ASSERT(map.br_blockcount >= 1); 425 ASSERT(map.br_startblock != DELAYSTARTBLOCK); 426 if (map.br_startblock == HOLESTARTBLOCK) 427 return -ENOENT; 428 429 trace_xfs_dqtobp_read(dqp); 430 431 /* 432 * store the blkno etc so that we don't have to do the 433 * mapping all the time 434 */ 435 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); 436 437 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, 438 mp->m_quotainfo->qi_dqchunklen, 0, &bp, 439 &xfs_dquot_buf_ops); 440 if (error) { 441 ASSERT(bp == NULL); 442 return error; 443 } 444 445 ASSERT(xfs_buf_islocked(bp)); 446 xfs_buf_set_ref(bp, XFS_DQUOT_REF); 447 *bpp = bp; 448 449 return 0; 450 } 451 452 /* Allocate and initialize everything we need for an incore dquot. */ 453 STATIC struct xfs_dquot * 454 xfs_dquot_alloc( 455 struct xfs_mount *mp, 456 xfs_dqid_t id, 457 xfs_dqtype_t type) 458 { 459 struct xfs_dquot *dqp; 460 461 dqp = kmem_cache_zalloc(xfs_dquot_cache, GFP_KERNEL | __GFP_NOFAIL); 462 463 dqp->q_type = type; 464 dqp->q_id = id; 465 dqp->q_mount = mp; 466 INIT_LIST_HEAD(&dqp->q_lru); 467 mutex_init(&dqp->q_qlock); 468 init_waitqueue_head(&dqp->q_pinwait); 469 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; 470 /* 471 * Offset of dquot in the (fixed sized) dquot chunk. 472 */ 473 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * 474 sizeof(struct xfs_dqblk); 475 476 /* 477 * Because we want to use a counting completion, complete 478 * the flush completion once to allow a single access to 479 * the flush completion without blocking. 480 */ 481 init_completion(&dqp->q_flush); 482 complete(&dqp->q_flush); 483 484 /* 485 * Make sure group quotas have a different lock class than user 486 * quotas. 487 */ 488 switch (type) { 489 case XFS_DQTYPE_USER: 490 /* uses the default lock class */ 491 break; 492 case XFS_DQTYPE_GROUP: 493 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class); 494 break; 495 case XFS_DQTYPE_PROJ: 496 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class); 497 break; 498 default: 499 ASSERT(0); 500 break; 501 } 502 503 xfs_qm_dquot_logitem_init(dqp); 504 505 XFS_STATS_INC(mp, xs_qm_dquot); 506 return dqp; 507 } 508 509 /* Check the ondisk dquot's id and type match what the incore dquot expects. */ 510 static bool 511 xfs_dquot_check_type( 512 struct xfs_dquot *dqp, 513 struct xfs_disk_dquot *ddqp) 514 { 515 uint8_t ddqp_type; 516 uint8_t dqp_type; 517 518 ddqp_type = ddqp->d_type & XFS_DQTYPE_REC_MASK; 519 dqp_type = xfs_dquot_type(dqp); 520 521 if (be32_to_cpu(ddqp->d_id) != dqp->q_id) 522 return false; 523 524 /* 525 * V5 filesystems always expect an exact type match. V4 filesystems 526 * expect an exact match for user dquots and for non-root group and 527 * project dquots. 528 */ 529 if (xfs_has_crc(dqp->q_mount) || 530 dqp_type == XFS_DQTYPE_USER || dqp->q_id != 0) 531 return ddqp_type == dqp_type; 532 533 /* 534 * V4 filesystems support either group or project quotas, but not both 535 * at the same time. The non-user quota file can be switched between 536 * group and project quota uses depending on the mount options, which 537 * means that we can encounter the other type when we try to load quota 538 * defaults. Quotacheck will soon reset the the entire quota file 539 * (including the root dquot) anyway, but don't log scary corruption 540 * reports to dmesg. 541 */ 542 return ddqp_type == XFS_DQTYPE_GROUP || ddqp_type == XFS_DQTYPE_PROJ; 543 } 544 545 /* Copy the in-core quota fields in from the on-disk buffer. */ 546 STATIC int 547 xfs_dquot_from_disk( 548 struct xfs_dquot *dqp, 549 struct xfs_buf *bp) 550 { 551 struct xfs_disk_dquot *ddqp = bp->b_addr + dqp->q_bufoffset; 552 553 /* 554 * Ensure that we got the type and ID we were looking for. 555 * Everything else was checked by the dquot buffer verifier. 556 */ 557 if (!xfs_dquot_check_type(dqp, ddqp)) { 558 xfs_alert_tag(bp->b_mount, XFS_PTAG_VERIFIER_ERROR, 559 "Metadata corruption detected at %pS, quota %u", 560 __this_address, dqp->q_id); 561 xfs_alert(bp->b_mount, "Unmount and run xfs_repair"); 562 return -EFSCORRUPTED; 563 } 564 565 /* copy everything from disk dquot to the incore dquot */ 566 dqp->q_type = ddqp->d_type; 567 dqp->q_blk.hardlimit = be64_to_cpu(ddqp->d_blk_hardlimit); 568 dqp->q_blk.softlimit = be64_to_cpu(ddqp->d_blk_softlimit); 569 dqp->q_ino.hardlimit = be64_to_cpu(ddqp->d_ino_hardlimit); 570 dqp->q_ino.softlimit = be64_to_cpu(ddqp->d_ino_softlimit); 571 dqp->q_rtb.hardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit); 572 dqp->q_rtb.softlimit = be64_to_cpu(ddqp->d_rtb_softlimit); 573 574 dqp->q_blk.count = be64_to_cpu(ddqp->d_bcount); 575 dqp->q_ino.count = be64_to_cpu(ddqp->d_icount); 576 dqp->q_rtb.count = be64_to_cpu(ddqp->d_rtbcount); 577 578 dqp->q_blk.warnings = be16_to_cpu(ddqp->d_bwarns); 579 dqp->q_ino.warnings = be16_to_cpu(ddqp->d_iwarns); 580 dqp->q_rtb.warnings = be16_to_cpu(ddqp->d_rtbwarns); 581 582 dqp->q_blk.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_btimer); 583 dqp->q_ino.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_itimer); 584 dqp->q_rtb.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_rtbtimer); 585 586 /* 587 * Reservation counters are defined as reservation plus current usage 588 * to avoid having to add every time. 589 */ 590 dqp->q_blk.reserved = dqp->q_blk.count; 591 dqp->q_ino.reserved = dqp->q_ino.count; 592 dqp->q_rtb.reserved = dqp->q_rtb.count; 593 594 /* initialize the dquot speculative prealloc thresholds */ 595 xfs_dquot_set_prealloc_limits(dqp); 596 return 0; 597 } 598 599 /* Copy the in-core quota fields into the on-disk buffer. */ 600 void 601 xfs_dquot_to_disk( 602 struct xfs_disk_dquot *ddqp, 603 struct xfs_dquot *dqp) 604 { 605 ddqp->d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 606 ddqp->d_version = XFS_DQUOT_VERSION; 607 ddqp->d_type = dqp->q_type; 608 ddqp->d_id = cpu_to_be32(dqp->q_id); 609 ddqp->d_pad0 = 0; 610 ddqp->d_pad = 0; 611 612 ddqp->d_blk_hardlimit = cpu_to_be64(dqp->q_blk.hardlimit); 613 ddqp->d_blk_softlimit = cpu_to_be64(dqp->q_blk.softlimit); 614 ddqp->d_ino_hardlimit = cpu_to_be64(dqp->q_ino.hardlimit); 615 ddqp->d_ino_softlimit = cpu_to_be64(dqp->q_ino.softlimit); 616 ddqp->d_rtb_hardlimit = cpu_to_be64(dqp->q_rtb.hardlimit); 617 ddqp->d_rtb_softlimit = cpu_to_be64(dqp->q_rtb.softlimit); 618 619 ddqp->d_bcount = cpu_to_be64(dqp->q_blk.count); 620 ddqp->d_icount = cpu_to_be64(dqp->q_ino.count); 621 ddqp->d_rtbcount = cpu_to_be64(dqp->q_rtb.count); 622 623 ddqp->d_bwarns = cpu_to_be16(dqp->q_blk.warnings); 624 ddqp->d_iwarns = cpu_to_be16(dqp->q_ino.warnings); 625 ddqp->d_rtbwarns = cpu_to_be16(dqp->q_rtb.warnings); 626 627 ddqp->d_btimer = xfs_dquot_to_disk_ts(dqp, dqp->q_blk.timer); 628 ddqp->d_itimer = xfs_dquot_to_disk_ts(dqp, dqp->q_ino.timer); 629 ddqp->d_rtbtimer = xfs_dquot_to_disk_ts(dqp, dqp->q_rtb.timer); 630 } 631 632 /* Allocate and initialize the dquot buffer for this in-core dquot. */ 633 static int 634 xfs_qm_dqread_alloc( 635 struct xfs_mount *mp, 636 struct xfs_dquot *dqp, 637 struct xfs_buf **bpp) 638 { 639 struct xfs_trans *tp; 640 int error; 641 642 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc, 643 XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp); 644 if (error) 645 goto err; 646 647 error = xfs_dquot_disk_alloc(&tp, dqp, bpp); 648 if (error) 649 goto err_cancel; 650 651 error = xfs_trans_commit(tp); 652 if (error) { 653 /* 654 * Buffer was held to the transaction, so we have to unlock it 655 * manually here because we're not passing it back. 656 */ 657 xfs_buf_relse(*bpp); 658 *bpp = NULL; 659 goto err; 660 } 661 return 0; 662 663 err_cancel: 664 xfs_trans_cancel(tp); 665 err: 666 return error; 667 } 668 669 /* 670 * Read in the ondisk dquot using dqtobp() then copy it to an incore version, 671 * and release the buffer immediately. If @can_alloc is true, fill any 672 * holes in the on-disk metadata. 673 */ 674 static int 675 xfs_qm_dqread( 676 struct xfs_mount *mp, 677 xfs_dqid_t id, 678 xfs_dqtype_t type, 679 bool can_alloc, 680 struct xfs_dquot **dqpp) 681 { 682 struct xfs_dquot *dqp; 683 struct xfs_buf *bp; 684 int error; 685 686 dqp = xfs_dquot_alloc(mp, id, type); 687 trace_xfs_dqread(dqp); 688 689 /* Try to read the buffer, allocating if necessary. */ 690 error = xfs_dquot_disk_read(mp, dqp, &bp); 691 if (error == -ENOENT && can_alloc) 692 error = xfs_qm_dqread_alloc(mp, dqp, &bp); 693 if (error) 694 goto err; 695 696 /* 697 * At this point we should have a clean locked buffer. Copy the data 698 * to the incore dquot and release the buffer since the incore dquot 699 * has its own locking protocol so we needn't tie up the buffer any 700 * further. 701 */ 702 ASSERT(xfs_buf_islocked(bp)); 703 error = xfs_dquot_from_disk(dqp, bp); 704 xfs_buf_relse(bp); 705 if (error) 706 goto err; 707 708 *dqpp = dqp; 709 return error; 710 711 err: 712 trace_xfs_dqread_fail(dqp); 713 xfs_qm_dqdestroy(dqp); 714 *dqpp = NULL; 715 return error; 716 } 717 718 /* 719 * Advance to the next id in the current chunk, or if at the 720 * end of the chunk, skip ahead to first id in next allocated chunk 721 * using the SEEK_DATA interface. 722 */ 723 static int 724 xfs_dq_get_next_id( 725 struct xfs_mount *mp, 726 xfs_dqtype_t type, 727 xfs_dqid_t *id) 728 { 729 struct xfs_inode *quotip = xfs_quota_inode(mp, type); 730 xfs_dqid_t next_id = *id + 1; /* simple advance */ 731 uint lock_flags; 732 struct xfs_bmbt_irec got; 733 struct xfs_iext_cursor cur; 734 xfs_fsblock_t start; 735 int error = 0; 736 737 /* If we'd wrap past the max ID, stop */ 738 if (next_id < *id) 739 return -ENOENT; 740 741 /* If new ID is within the current chunk, advancing it sufficed */ 742 if (next_id % mp->m_quotainfo->qi_dqperchunk) { 743 *id = next_id; 744 return 0; 745 } 746 747 /* Nope, next_id is now past the current chunk, so find the next one */ 748 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk; 749 750 lock_flags = xfs_ilock_data_map_shared(quotip); 751 error = xfs_iread_extents(NULL, quotip, XFS_DATA_FORK); 752 if (error) 753 return error; 754 755 if (xfs_iext_lookup_extent(quotip, "ip->i_df, start, &cur, &got)) { 756 /* contiguous chunk, bump startoff for the id calculation */ 757 if (got.br_startoff < start) 758 got.br_startoff = start; 759 *id = got.br_startoff * mp->m_quotainfo->qi_dqperchunk; 760 } else { 761 error = -ENOENT; 762 } 763 764 xfs_iunlock(quotip, lock_flags); 765 766 return error; 767 } 768 769 /* 770 * Look up the dquot in the in-core cache. If found, the dquot is returned 771 * locked and ready to go. 772 */ 773 static struct xfs_dquot * 774 xfs_qm_dqget_cache_lookup( 775 struct xfs_mount *mp, 776 struct xfs_quotainfo *qi, 777 struct radix_tree_root *tree, 778 xfs_dqid_t id) 779 { 780 struct xfs_dquot *dqp; 781 782 restart: 783 mutex_lock(&qi->qi_tree_lock); 784 dqp = radix_tree_lookup(tree, id); 785 if (!dqp) { 786 mutex_unlock(&qi->qi_tree_lock); 787 XFS_STATS_INC(mp, xs_qm_dqcachemisses); 788 return NULL; 789 } 790 791 xfs_dqlock(dqp); 792 if (dqp->q_flags & XFS_DQFLAG_FREEING) { 793 xfs_dqunlock(dqp); 794 mutex_unlock(&qi->qi_tree_lock); 795 trace_xfs_dqget_freeing(dqp); 796 delay(1); 797 goto restart; 798 } 799 800 dqp->q_nrefs++; 801 mutex_unlock(&qi->qi_tree_lock); 802 803 trace_xfs_dqget_hit(dqp); 804 XFS_STATS_INC(mp, xs_qm_dqcachehits); 805 return dqp; 806 } 807 808 /* 809 * Try to insert a new dquot into the in-core cache. If an error occurs the 810 * caller should throw away the dquot and start over. Otherwise, the dquot 811 * is returned locked (and held by the cache) as if there had been a cache 812 * hit. 813 */ 814 static int 815 xfs_qm_dqget_cache_insert( 816 struct xfs_mount *mp, 817 struct xfs_quotainfo *qi, 818 struct radix_tree_root *tree, 819 xfs_dqid_t id, 820 struct xfs_dquot *dqp) 821 { 822 int error; 823 824 mutex_lock(&qi->qi_tree_lock); 825 error = radix_tree_insert(tree, id, dqp); 826 if (unlikely(error)) { 827 /* Duplicate found! Caller must try again. */ 828 WARN_ON(error != -EEXIST); 829 mutex_unlock(&qi->qi_tree_lock); 830 trace_xfs_dqget_dup(dqp); 831 return error; 832 } 833 834 /* Return a locked dquot to the caller, with a reference taken. */ 835 xfs_dqlock(dqp); 836 dqp->q_nrefs = 1; 837 838 qi->qi_dquots++; 839 mutex_unlock(&qi->qi_tree_lock); 840 841 return 0; 842 } 843 844 /* Check our input parameters. */ 845 static int 846 xfs_qm_dqget_checks( 847 struct xfs_mount *mp, 848 xfs_dqtype_t type) 849 { 850 switch (type) { 851 case XFS_DQTYPE_USER: 852 if (!XFS_IS_UQUOTA_ON(mp)) 853 return -ESRCH; 854 return 0; 855 case XFS_DQTYPE_GROUP: 856 if (!XFS_IS_GQUOTA_ON(mp)) 857 return -ESRCH; 858 return 0; 859 case XFS_DQTYPE_PROJ: 860 if (!XFS_IS_PQUOTA_ON(mp)) 861 return -ESRCH; 862 return 0; 863 default: 864 WARN_ON_ONCE(0); 865 return -EINVAL; 866 } 867 } 868 869 /* 870 * Given the file system, id, and type (UDQUOT/GDQUOT/PDQUOT), return a 871 * locked dquot, doing an allocation (if requested) as needed. 872 */ 873 int 874 xfs_qm_dqget( 875 struct xfs_mount *mp, 876 xfs_dqid_t id, 877 xfs_dqtype_t type, 878 bool can_alloc, 879 struct xfs_dquot **O_dqpp) 880 { 881 struct xfs_quotainfo *qi = mp->m_quotainfo; 882 struct radix_tree_root *tree = xfs_dquot_tree(qi, type); 883 struct xfs_dquot *dqp; 884 int error; 885 886 error = xfs_qm_dqget_checks(mp, type); 887 if (error) 888 return error; 889 890 restart: 891 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id); 892 if (dqp) { 893 *O_dqpp = dqp; 894 return 0; 895 } 896 897 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp); 898 if (error) 899 return error; 900 901 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp); 902 if (error) { 903 /* 904 * Duplicate found. Just throw away the new dquot and start 905 * over. 906 */ 907 xfs_qm_dqdestroy(dqp); 908 XFS_STATS_INC(mp, xs_qm_dquot_dups); 909 goto restart; 910 } 911 912 trace_xfs_dqget_miss(dqp); 913 *O_dqpp = dqp; 914 return 0; 915 } 916 917 /* 918 * Given a dquot id and type, read and initialize a dquot from the on-disk 919 * metadata. This function is only for use during quota initialization so 920 * it ignores the dquot cache assuming that the dquot shrinker isn't set up. 921 * The caller is responsible for _qm_dqdestroy'ing the returned dquot. 922 */ 923 int 924 xfs_qm_dqget_uncached( 925 struct xfs_mount *mp, 926 xfs_dqid_t id, 927 xfs_dqtype_t type, 928 struct xfs_dquot **dqpp) 929 { 930 int error; 931 932 error = xfs_qm_dqget_checks(mp, type); 933 if (error) 934 return error; 935 936 return xfs_qm_dqread(mp, id, type, 0, dqpp); 937 } 938 939 /* Return the quota id for a given inode and type. */ 940 xfs_dqid_t 941 xfs_qm_id_for_quotatype( 942 struct xfs_inode *ip, 943 xfs_dqtype_t type) 944 { 945 switch (type) { 946 case XFS_DQTYPE_USER: 947 return i_uid_read(VFS_I(ip)); 948 case XFS_DQTYPE_GROUP: 949 return i_gid_read(VFS_I(ip)); 950 case XFS_DQTYPE_PROJ: 951 return ip->i_projid; 952 } 953 ASSERT(0); 954 return 0; 955 } 956 957 /* 958 * Return the dquot for a given inode and type. If @can_alloc is true, then 959 * allocate blocks if needed. The inode's ILOCK must be held and it must not 960 * have already had an inode attached. 961 */ 962 int 963 xfs_qm_dqget_inode( 964 struct xfs_inode *ip, 965 xfs_dqtype_t type, 966 bool can_alloc, 967 struct xfs_dquot **O_dqpp) 968 { 969 struct xfs_mount *mp = ip->i_mount; 970 struct xfs_quotainfo *qi = mp->m_quotainfo; 971 struct radix_tree_root *tree = xfs_dquot_tree(qi, type); 972 struct xfs_dquot *dqp; 973 xfs_dqid_t id; 974 int error; 975 976 error = xfs_qm_dqget_checks(mp, type); 977 if (error) 978 return error; 979 980 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 981 ASSERT(xfs_inode_dquot(ip, type) == NULL); 982 983 id = xfs_qm_id_for_quotatype(ip, type); 984 985 restart: 986 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id); 987 if (dqp) { 988 *O_dqpp = dqp; 989 return 0; 990 } 991 992 /* 993 * Dquot cache miss. We don't want to keep the inode lock across 994 * a (potential) disk read. Also we don't want to deal with the lock 995 * ordering between quotainode and this inode. OTOH, dropping the inode 996 * lock here means dealing with a chown that can happen before 997 * we re-acquire the lock. 998 */ 999 xfs_iunlock(ip, XFS_ILOCK_EXCL); 1000 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp); 1001 xfs_ilock(ip, XFS_ILOCK_EXCL); 1002 if (error) 1003 return error; 1004 1005 /* 1006 * A dquot could be attached to this inode by now, since we had 1007 * dropped the ilock. 1008 */ 1009 if (xfs_this_quota_on(mp, type)) { 1010 struct xfs_dquot *dqp1; 1011 1012 dqp1 = xfs_inode_dquot(ip, type); 1013 if (dqp1) { 1014 xfs_qm_dqdestroy(dqp); 1015 dqp = dqp1; 1016 xfs_dqlock(dqp); 1017 goto dqret; 1018 } 1019 } else { 1020 /* inode stays locked on return */ 1021 xfs_qm_dqdestroy(dqp); 1022 return -ESRCH; 1023 } 1024 1025 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp); 1026 if (error) { 1027 /* 1028 * Duplicate found. Just throw away the new dquot and start 1029 * over. 1030 */ 1031 xfs_qm_dqdestroy(dqp); 1032 XFS_STATS_INC(mp, xs_qm_dquot_dups); 1033 goto restart; 1034 } 1035 1036 dqret: 1037 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 1038 trace_xfs_dqget_miss(dqp); 1039 *O_dqpp = dqp; 1040 return 0; 1041 } 1042 1043 /* 1044 * Starting at @id and progressing upwards, look for an initialized incore 1045 * dquot, lock it, and return it. 1046 */ 1047 int 1048 xfs_qm_dqget_next( 1049 struct xfs_mount *mp, 1050 xfs_dqid_t id, 1051 xfs_dqtype_t type, 1052 struct xfs_dquot **dqpp) 1053 { 1054 struct xfs_dquot *dqp; 1055 int error = 0; 1056 1057 *dqpp = NULL; 1058 for (; !error; error = xfs_dq_get_next_id(mp, type, &id)) { 1059 error = xfs_qm_dqget(mp, id, type, false, &dqp); 1060 if (error == -ENOENT) 1061 continue; 1062 else if (error != 0) 1063 break; 1064 1065 if (!XFS_IS_DQUOT_UNINITIALIZED(dqp)) { 1066 *dqpp = dqp; 1067 return 0; 1068 } 1069 1070 xfs_qm_dqput(dqp); 1071 } 1072 1073 return error; 1074 } 1075 1076 /* 1077 * Release a reference to the dquot (decrement ref-count) and unlock it. 1078 * 1079 * If there is a group quota attached to this dquot, carefully release that 1080 * too without tripping over deadlocks'n'stuff. 1081 */ 1082 void 1083 xfs_qm_dqput( 1084 struct xfs_dquot *dqp) 1085 { 1086 ASSERT(dqp->q_nrefs > 0); 1087 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 1088 1089 trace_xfs_dqput(dqp); 1090 1091 if (--dqp->q_nrefs == 0) { 1092 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo; 1093 trace_xfs_dqput_free(dqp); 1094 1095 if (list_lru_add(&qi->qi_lru, &dqp->q_lru)) 1096 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused); 1097 } 1098 xfs_dqunlock(dqp); 1099 } 1100 1101 /* 1102 * Release a dquot. Flush it if dirty, then dqput() it. 1103 * dquot must not be locked. 1104 */ 1105 void 1106 xfs_qm_dqrele( 1107 struct xfs_dquot *dqp) 1108 { 1109 if (!dqp) 1110 return; 1111 1112 trace_xfs_dqrele(dqp); 1113 1114 xfs_dqlock(dqp); 1115 /* 1116 * We don't care to flush it if the dquot is dirty here. 1117 * That will create stutters that we want to avoid. 1118 * Instead we do a delayed write when we try to reclaim 1119 * a dirty dquot. Also xfs_sync will take part of the burden... 1120 */ 1121 xfs_qm_dqput(dqp); 1122 } 1123 1124 /* 1125 * This is the dquot flushing I/O completion routine. It is called 1126 * from interrupt level when the buffer containing the dquot is 1127 * flushed to disk. It is responsible for removing the dquot logitem 1128 * from the AIL if it has not been re-logged, and unlocking the dquot's 1129 * flush lock. This behavior is very similar to that of inodes.. 1130 */ 1131 static void 1132 xfs_qm_dqflush_done( 1133 struct xfs_log_item *lip) 1134 { 1135 struct xfs_dq_logitem *qip = (struct xfs_dq_logitem *)lip; 1136 struct xfs_dquot *dqp = qip->qli_dquot; 1137 struct xfs_ail *ailp = lip->li_ailp; 1138 xfs_lsn_t tail_lsn; 1139 1140 /* 1141 * We only want to pull the item from the AIL if its 1142 * location in the log has not changed since we started the flush. 1143 * Thus, we only bother if the dquot's lsn has 1144 * not changed. First we check the lsn outside the lock 1145 * since it's cheaper, and then we recheck while 1146 * holding the lock before removing the dquot from the AIL. 1147 */ 1148 if (test_bit(XFS_LI_IN_AIL, &lip->li_flags) && 1149 ((lip->li_lsn == qip->qli_flush_lsn) || 1150 test_bit(XFS_LI_FAILED, &lip->li_flags))) { 1151 1152 spin_lock(&ailp->ail_lock); 1153 xfs_clear_li_failed(lip); 1154 if (lip->li_lsn == qip->qli_flush_lsn) { 1155 /* xfs_ail_update_finish() drops the AIL lock */ 1156 tail_lsn = xfs_ail_delete_one(ailp, lip); 1157 xfs_ail_update_finish(ailp, tail_lsn); 1158 } else { 1159 spin_unlock(&ailp->ail_lock); 1160 } 1161 } 1162 1163 /* 1164 * Release the dq's flush lock since we're done with it. 1165 */ 1166 xfs_dqfunlock(dqp); 1167 } 1168 1169 void 1170 xfs_buf_dquot_iodone( 1171 struct xfs_buf *bp) 1172 { 1173 struct xfs_log_item *lip, *n; 1174 1175 list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) { 1176 list_del_init(&lip->li_bio_list); 1177 xfs_qm_dqflush_done(lip); 1178 } 1179 } 1180 1181 void 1182 xfs_buf_dquot_io_fail( 1183 struct xfs_buf *bp) 1184 { 1185 struct xfs_log_item *lip; 1186 1187 spin_lock(&bp->b_mount->m_ail->ail_lock); 1188 list_for_each_entry(lip, &bp->b_li_list, li_bio_list) 1189 xfs_set_li_failed(lip, bp); 1190 spin_unlock(&bp->b_mount->m_ail->ail_lock); 1191 } 1192 1193 /* Check incore dquot for errors before we flush. */ 1194 static xfs_failaddr_t 1195 xfs_qm_dqflush_check( 1196 struct xfs_dquot *dqp) 1197 { 1198 xfs_dqtype_t type = xfs_dquot_type(dqp); 1199 1200 if (type != XFS_DQTYPE_USER && 1201 type != XFS_DQTYPE_GROUP && 1202 type != XFS_DQTYPE_PROJ) 1203 return __this_address; 1204 1205 if (dqp->q_id == 0) 1206 return NULL; 1207 1208 if (dqp->q_blk.softlimit && dqp->q_blk.count > dqp->q_blk.softlimit && 1209 !dqp->q_blk.timer) 1210 return __this_address; 1211 1212 if (dqp->q_ino.softlimit && dqp->q_ino.count > dqp->q_ino.softlimit && 1213 !dqp->q_ino.timer) 1214 return __this_address; 1215 1216 if (dqp->q_rtb.softlimit && dqp->q_rtb.count > dqp->q_rtb.softlimit && 1217 !dqp->q_rtb.timer) 1218 return __this_address; 1219 1220 /* bigtime flag should never be set on root dquots */ 1221 if (dqp->q_type & XFS_DQTYPE_BIGTIME) { 1222 if (!xfs_has_bigtime(dqp->q_mount)) 1223 return __this_address; 1224 if (dqp->q_id == 0) 1225 return __this_address; 1226 } 1227 1228 return NULL; 1229 } 1230 1231 /* 1232 * Write a modified dquot to disk. 1233 * The dquot must be locked and the flush lock too taken by caller. 1234 * The flush lock will not be unlocked until the dquot reaches the disk, 1235 * but the dquot is free to be unlocked and modified by the caller 1236 * in the interim. Dquot is still locked on return. This behavior is 1237 * identical to that of inodes. 1238 */ 1239 int 1240 xfs_qm_dqflush( 1241 struct xfs_dquot *dqp, 1242 struct xfs_buf **bpp) 1243 { 1244 struct xfs_mount *mp = dqp->q_mount; 1245 struct xfs_log_item *lip = &dqp->q_logitem.qli_item; 1246 struct xfs_buf *bp; 1247 struct xfs_dqblk *dqblk; 1248 xfs_failaddr_t fa; 1249 int error; 1250 1251 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 1252 ASSERT(!completion_done(&dqp->q_flush)); 1253 1254 trace_xfs_dqflush(dqp); 1255 1256 *bpp = NULL; 1257 1258 xfs_qm_dqunpin_wait(dqp); 1259 1260 /* 1261 * Get the buffer containing the on-disk dquot 1262 */ 1263 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, 1264 mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK, 1265 &bp, &xfs_dquot_buf_ops); 1266 if (error == -EAGAIN) 1267 goto out_unlock; 1268 if (error) 1269 goto out_abort; 1270 1271 fa = xfs_qm_dqflush_check(dqp); 1272 if (fa) { 1273 xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS", 1274 dqp->q_id, fa); 1275 xfs_buf_relse(bp); 1276 error = -EFSCORRUPTED; 1277 goto out_abort; 1278 } 1279 1280 /* Flush the incore dquot to the ondisk buffer. */ 1281 dqblk = bp->b_addr + dqp->q_bufoffset; 1282 xfs_dquot_to_disk(&dqblk->dd_diskdq, dqp); 1283 1284 /* 1285 * Clear the dirty field and remember the flush lsn for later use. 1286 */ 1287 dqp->q_flags &= ~XFS_DQFLAG_DIRTY; 1288 1289 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn, 1290 &dqp->q_logitem.qli_item.li_lsn); 1291 1292 /* 1293 * copy the lsn into the on-disk dquot now while we have the in memory 1294 * dquot here. This can't be done later in the write verifier as we 1295 * can't get access to the log item at that point in time. 1296 * 1297 * We also calculate the CRC here so that the on-disk dquot in the 1298 * buffer always has a valid CRC. This ensures there is no possibility 1299 * of a dquot without an up-to-date CRC getting to disk. 1300 */ 1301 if (xfs_has_crc(mp)) { 1302 dqblk->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn); 1303 xfs_update_cksum((char *)dqblk, sizeof(struct xfs_dqblk), 1304 XFS_DQUOT_CRC_OFF); 1305 } 1306 1307 /* 1308 * Attach the dquot to the buffer so that we can remove this dquot from 1309 * the AIL and release the flush lock once the dquot is synced to disk. 1310 */ 1311 bp->b_flags |= _XBF_DQUOTS; 1312 list_add_tail(&dqp->q_logitem.qli_item.li_bio_list, &bp->b_li_list); 1313 1314 /* 1315 * If the buffer is pinned then push on the log so we won't 1316 * get stuck waiting in the write for too long. 1317 */ 1318 if (xfs_buf_ispinned(bp)) { 1319 trace_xfs_dqflush_force(dqp); 1320 xfs_log_force(mp, 0); 1321 } 1322 1323 trace_xfs_dqflush_done(dqp); 1324 *bpp = bp; 1325 return 0; 1326 1327 out_abort: 1328 dqp->q_flags &= ~XFS_DQFLAG_DIRTY; 1329 xfs_trans_ail_delete(lip, 0); 1330 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1331 out_unlock: 1332 xfs_dqfunlock(dqp); 1333 return error; 1334 } 1335 1336 /* 1337 * Lock two xfs_dquot structures. 1338 * 1339 * To avoid deadlocks we always lock the quota structure with 1340 * the lowerd id first. 1341 */ 1342 void 1343 xfs_dqlock2( 1344 struct xfs_dquot *d1, 1345 struct xfs_dquot *d2) 1346 { 1347 if (d1 && d2) { 1348 ASSERT(d1 != d2); 1349 if (d1->q_id > d2->q_id) { 1350 mutex_lock(&d2->q_qlock); 1351 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED); 1352 } else { 1353 mutex_lock(&d1->q_qlock); 1354 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED); 1355 } 1356 } else if (d1) { 1357 mutex_lock(&d1->q_qlock); 1358 } else if (d2) { 1359 mutex_lock(&d2->q_qlock); 1360 } 1361 } 1362 1363 int __init 1364 xfs_qm_init(void) 1365 { 1366 xfs_dquot_cache = kmem_cache_create("xfs_dquot", 1367 sizeof(struct xfs_dquot), 1368 0, 0, NULL); 1369 if (!xfs_dquot_cache) 1370 goto out; 1371 1372 xfs_dqtrx_cache = kmem_cache_create("xfs_dqtrx", 1373 sizeof(struct xfs_dquot_acct), 1374 0, 0, NULL); 1375 if (!xfs_dqtrx_cache) 1376 goto out_free_dquot_cache; 1377 1378 return 0; 1379 1380 out_free_dquot_cache: 1381 kmem_cache_destroy(xfs_dquot_cache); 1382 out: 1383 return -ENOMEM; 1384 } 1385 1386 void 1387 xfs_qm_exit(void) 1388 { 1389 kmem_cache_destroy(xfs_dqtrx_cache); 1390 kmem_cache_destroy(xfs_dquot_cache); 1391 } 1392 1393 /* 1394 * Iterate every dquot of a particular type. The caller must ensure that the 1395 * particular quota type is active. iter_fn can return negative error codes, 1396 * or -ECANCELED to indicate that it wants to stop iterating. 1397 */ 1398 int 1399 xfs_qm_dqiterate( 1400 struct xfs_mount *mp, 1401 xfs_dqtype_t type, 1402 xfs_qm_dqiterate_fn iter_fn, 1403 void *priv) 1404 { 1405 struct xfs_dquot *dq; 1406 xfs_dqid_t id = 0; 1407 int error; 1408 1409 do { 1410 error = xfs_qm_dqget_next(mp, id, type, &dq); 1411 if (error == -ENOENT) 1412 return 0; 1413 if (error) 1414 return error; 1415 1416 error = iter_fn(dq, type, priv); 1417 id = dq->q_id; 1418 xfs_qm_dqput(dq); 1419 } while (error == 0 && id != 0); 1420 1421 return error; 1422 } 1423