1 /* 2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 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 7 * published by the Free Software Foundation. 8 * 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. 13 * 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 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_format.h" 21 #include "xfs_log_format.h" 22 #include "xfs_shared.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_bit.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_mount.h" 28 #include "xfs_inode.h" 29 #include "xfs_bmap.h" 30 #include "xfs_bmap_util.h" 31 #include "xfs_alloc.h" 32 #include "xfs_quota.h" 33 #include "xfs_error.h" 34 #include "xfs_trans.h" 35 #include "xfs_buf_item.h" 36 #include "xfs_trans_space.h" 37 #include "xfs_trans_priv.h" 38 #include "xfs_qm.h" 39 #include "xfs_cksum.h" 40 #include "xfs_trace.h" 41 #include "xfs_log.h" 42 #include "xfs_bmap_btree.h" 43 44 /* 45 * Lock order: 46 * 47 * ip->i_lock 48 * qi->qi_tree_lock 49 * dquot->q_qlock (xfs_dqlock() and friends) 50 * dquot->q_flush (xfs_dqflock() and friends) 51 * qi->qi_lru_lock 52 * 53 * If two dquots need to be locked the order is user before group/project, 54 * otherwise by the lowest id first, see xfs_dqlock2. 55 */ 56 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 64 struct kmem_zone *xfs_qm_dqtrxzone; 65 static struct kmem_zone *xfs_qm_dqzone; 66 67 static struct lock_class_key xfs_dquot_group_class; 68 static struct lock_class_key xfs_dquot_project_class; 69 70 /* 71 * This is called to free all the memory associated with a dquot 72 */ 73 void 74 xfs_qm_dqdestroy( 75 xfs_dquot_t *dqp) 76 { 77 ASSERT(list_empty(&dqp->q_lru)); 78 79 mutex_destroy(&dqp->q_qlock); 80 kmem_zone_free(xfs_qm_dqzone, dqp); 81 82 XFS_STATS_DEC(xs_qm_dquot); 83 } 84 85 /* 86 * If default limits are in force, push them into the dquot now. 87 * We overwrite the dquot limits only if they are zero and this 88 * is not the root dquot. 89 */ 90 void 91 xfs_qm_adjust_dqlimits( 92 struct xfs_mount *mp, 93 struct xfs_dquot *dq) 94 { 95 struct xfs_quotainfo *q = mp->m_quotainfo; 96 struct xfs_disk_dquot *d = &dq->q_core; 97 int prealloc = 0; 98 99 ASSERT(d->d_id); 100 101 if (q->qi_bsoftlimit && !d->d_blk_softlimit) { 102 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit); 103 prealloc = 1; 104 } 105 if (q->qi_bhardlimit && !d->d_blk_hardlimit) { 106 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit); 107 prealloc = 1; 108 } 109 if (q->qi_isoftlimit && !d->d_ino_softlimit) 110 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit); 111 if (q->qi_ihardlimit && !d->d_ino_hardlimit) 112 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit); 113 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit) 114 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit); 115 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit) 116 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit); 117 118 if (prealloc) 119 xfs_dquot_set_prealloc_limits(dq); 120 } 121 122 /* 123 * Check the limits and timers of a dquot and start or reset timers 124 * if necessary. 125 * This gets called even when quota enforcement is OFF, which makes our 126 * life a little less complicated. (We just don't reject any quota 127 * reservations in that case, when enforcement is off). 128 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when 129 * enforcement's off. 130 * In contrast, warnings are a little different in that they don't 131 * 'automatically' get started when limits get exceeded. They do 132 * get reset to zero, however, when we find the count to be under 133 * the soft limit (they are only ever set non-zero via userspace). 134 */ 135 void 136 xfs_qm_adjust_dqtimers( 137 xfs_mount_t *mp, 138 xfs_disk_dquot_t *d) 139 { 140 ASSERT(d->d_id); 141 142 #ifdef DEBUG 143 if (d->d_blk_hardlimit) 144 ASSERT(be64_to_cpu(d->d_blk_softlimit) <= 145 be64_to_cpu(d->d_blk_hardlimit)); 146 if (d->d_ino_hardlimit) 147 ASSERT(be64_to_cpu(d->d_ino_softlimit) <= 148 be64_to_cpu(d->d_ino_hardlimit)); 149 if (d->d_rtb_hardlimit) 150 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <= 151 be64_to_cpu(d->d_rtb_hardlimit)); 152 #endif 153 154 if (!d->d_btimer) { 155 if ((d->d_blk_softlimit && 156 (be64_to_cpu(d->d_bcount) > 157 be64_to_cpu(d->d_blk_softlimit))) || 158 (d->d_blk_hardlimit && 159 (be64_to_cpu(d->d_bcount) > 160 be64_to_cpu(d->d_blk_hardlimit)))) { 161 d->d_btimer = cpu_to_be32(get_seconds() + 162 mp->m_quotainfo->qi_btimelimit); 163 } else { 164 d->d_bwarns = 0; 165 } 166 } else { 167 if ((!d->d_blk_softlimit || 168 (be64_to_cpu(d->d_bcount) <= 169 be64_to_cpu(d->d_blk_softlimit))) && 170 (!d->d_blk_hardlimit || 171 (be64_to_cpu(d->d_bcount) <= 172 be64_to_cpu(d->d_blk_hardlimit)))) { 173 d->d_btimer = 0; 174 } 175 } 176 177 if (!d->d_itimer) { 178 if ((d->d_ino_softlimit && 179 (be64_to_cpu(d->d_icount) > 180 be64_to_cpu(d->d_ino_softlimit))) || 181 (d->d_ino_hardlimit && 182 (be64_to_cpu(d->d_icount) > 183 be64_to_cpu(d->d_ino_hardlimit)))) { 184 d->d_itimer = cpu_to_be32(get_seconds() + 185 mp->m_quotainfo->qi_itimelimit); 186 } else { 187 d->d_iwarns = 0; 188 } 189 } else { 190 if ((!d->d_ino_softlimit || 191 (be64_to_cpu(d->d_icount) <= 192 be64_to_cpu(d->d_ino_softlimit))) && 193 (!d->d_ino_hardlimit || 194 (be64_to_cpu(d->d_icount) <= 195 be64_to_cpu(d->d_ino_hardlimit)))) { 196 d->d_itimer = 0; 197 } 198 } 199 200 if (!d->d_rtbtimer) { 201 if ((d->d_rtb_softlimit && 202 (be64_to_cpu(d->d_rtbcount) > 203 be64_to_cpu(d->d_rtb_softlimit))) || 204 (d->d_rtb_hardlimit && 205 (be64_to_cpu(d->d_rtbcount) > 206 be64_to_cpu(d->d_rtb_hardlimit)))) { 207 d->d_rtbtimer = cpu_to_be32(get_seconds() + 208 mp->m_quotainfo->qi_rtbtimelimit); 209 } else { 210 d->d_rtbwarns = 0; 211 } 212 } else { 213 if ((!d->d_rtb_softlimit || 214 (be64_to_cpu(d->d_rtbcount) <= 215 be64_to_cpu(d->d_rtb_softlimit))) && 216 (!d->d_rtb_hardlimit || 217 (be64_to_cpu(d->d_rtbcount) <= 218 be64_to_cpu(d->d_rtb_hardlimit)))) { 219 d->d_rtbtimer = 0; 220 } 221 } 222 } 223 224 /* 225 * initialize a buffer full of dquots and log the whole thing 226 */ 227 STATIC void 228 xfs_qm_init_dquot_blk( 229 xfs_trans_t *tp, 230 xfs_mount_t *mp, 231 xfs_dqid_t id, 232 uint type, 233 xfs_buf_t *bp) 234 { 235 struct xfs_quotainfo *q = mp->m_quotainfo; 236 xfs_dqblk_t *d; 237 int curid, i; 238 239 ASSERT(tp); 240 ASSERT(xfs_buf_islocked(bp)); 241 242 d = bp->b_addr; 243 244 /* 245 * ID of the first dquot in the block - id's are zero based. 246 */ 247 curid = id - (id % q->qi_dqperchunk); 248 ASSERT(curid >= 0); 249 memset(d, 0, BBTOB(q->qi_dqchunklen)); 250 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) { 251 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 252 d->dd_diskdq.d_version = XFS_DQUOT_VERSION; 253 d->dd_diskdq.d_id = cpu_to_be32(curid); 254 d->dd_diskdq.d_flags = type; 255 if (xfs_sb_version_hascrc(&mp->m_sb)) { 256 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid); 257 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), 258 XFS_DQUOT_CRC_OFF); 259 } 260 } 261 262 xfs_trans_dquot_buf(tp, bp, 263 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF : 264 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF : 265 XFS_BLF_GDQUOT_BUF))); 266 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1); 267 } 268 269 /* 270 * Initialize the dynamic speculative preallocation thresholds. The lo/hi 271 * watermarks correspond to the soft and hard limits by default. If a soft limit 272 * is not specified, we use 95% of the hard limit. 273 */ 274 void 275 xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp) 276 { 277 __uint64_t space; 278 279 dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit); 280 dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit); 281 if (!dqp->q_prealloc_lo_wmark) { 282 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark; 283 do_div(dqp->q_prealloc_lo_wmark, 100); 284 dqp->q_prealloc_lo_wmark *= 95; 285 } 286 287 space = dqp->q_prealloc_hi_wmark; 288 289 do_div(space, 100); 290 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space; 291 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3; 292 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5; 293 } 294 295 /* 296 * Allocate a block and fill it with dquots. 297 * This is called when the bmapi finds a hole. 298 */ 299 STATIC int 300 xfs_qm_dqalloc( 301 xfs_trans_t **tpp, 302 xfs_mount_t *mp, 303 xfs_dquot_t *dqp, 304 xfs_inode_t *quotip, 305 xfs_fileoff_t offset_fsb, 306 xfs_buf_t **O_bpp) 307 { 308 xfs_fsblock_t firstblock; 309 xfs_bmap_free_t flist; 310 xfs_bmbt_irec_t map; 311 int nmaps, error, committed; 312 xfs_buf_t *bp; 313 xfs_trans_t *tp = *tpp; 314 315 ASSERT(tp != NULL); 316 317 trace_xfs_dqalloc(dqp); 318 319 /* 320 * Initialize the bmap freelist prior to calling bmapi code. 321 */ 322 xfs_bmap_init(&flist, &firstblock); 323 xfs_ilock(quotip, XFS_ILOCK_EXCL); 324 /* 325 * Return if this type of quotas is turned off while we didn't 326 * have an inode lock 327 */ 328 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) { 329 xfs_iunlock(quotip, XFS_ILOCK_EXCL); 330 return (ESRCH); 331 } 332 333 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL); 334 nmaps = 1; 335 error = xfs_bmapi_write(tp, quotip, offset_fsb, 336 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA, 337 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp), 338 &map, &nmaps, &flist); 339 if (error) 340 goto error0; 341 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB); 342 ASSERT(nmaps == 1); 343 ASSERT((map.br_startblock != DELAYSTARTBLOCK) && 344 (map.br_startblock != HOLESTARTBLOCK)); 345 346 /* 347 * Keep track of the blkno to save a lookup later 348 */ 349 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); 350 351 /* now we can just get the buffer (there's nothing to read yet) */ 352 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, 353 dqp->q_blkno, 354 mp->m_quotainfo->qi_dqchunklen, 355 0); 356 357 error = xfs_buf_geterror(bp); 358 if (error) 359 goto error1; 360 bp->b_ops = &xfs_dquot_buf_ops; 361 362 /* 363 * Make a chunk of dquots out of this buffer and log 364 * the entire thing. 365 */ 366 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id), 367 dqp->dq_flags & XFS_DQ_ALLTYPES, bp); 368 369 /* 370 * xfs_bmap_finish() may commit the current transaction and 371 * start a second transaction if the freelist is not empty. 372 * 373 * Since we still want to modify this buffer, we need to 374 * ensure that the buffer is not released on commit of 375 * the first transaction and ensure the buffer is added to the 376 * second transaction. 377 * 378 * If there is only one transaction then don't stop the buffer 379 * from being released when it commits later on. 380 */ 381 382 xfs_trans_bhold(tp, bp); 383 384 if ((error = xfs_bmap_finish(tpp, &flist, &committed))) { 385 goto error1; 386 } 387 388 if (committed) { 389 tp = *tpp; 390 xfs_trans_bjoin(tp, bp); 391 } else { 392 xfs_trans_bhold_release(tp, bp); 393 } 394 395 *O_bpp = bp; 396 return 0; 397 398 error1: 399 xfs_bmap_cancel(&flist); 400 error0: 401 xfs_iunlock(quotip, XFS_ILOCK_EXCL); 402 403 return (error); 404 } 405 406 STATIC int 407 xfs_qm_dqrepair( 408 struct xfs_mount *mp, 409 struct xfs_trans *tp, 410 struct xfs_dquot *dqp, 411 xfs_dqid_t firstid, 412 struct xfs_buf **bpp) 413 { 414 int error; 415 struct xfs_disk_dquot *ddq; 416 struct xfs_dqblk *d; 417 int i; 418 419 /* 420 * Read the buffer without verification so we get the corrupted 421 * buffer returned to us. make sure we verify it on write, though. 422 */ 423 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno, 424 mp->m_quotainfo->qi_dqchunklen, 425 0, bpp, NULL); 426 427 if (error) { 428 ASSERT(*bpp == NULL); 429 return XFS_ERROR(error); 430 } 431 (*bpp)->b_ops = &xfs_dquot_buf_ops; 432 433 ASSERT(xfs_buf_islocked(*bpp)); 434 d = (struct xfs_dqblk *)(*bpp)->b_addr; 435 436 /* Do the actual repair of dquots in this buffer */ 437 for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) { 438 ddq = &d[i].dd_diskdq; 439 error = xfs_dqcheck(mp, ddq, firstid + i, 440 dqp->dq_flags & XFS_DQ_ALLTYPES, 441 XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair"); 442 if (error) { 443 /* repair failed, we're screwed */ 444 xfs_trans_brelse(tp, *bpp); 445 return XFS_ERROR(EIO); 446 } 447 } 448 449 return 0; 450 } 451 452 /* 453 * Maps a dquot to the buffer containing its on-disk version. 454 * This returns a ptr to the buffer containing the on-disk dquot 455 * in the bpp param, and a ptr to the on-disk dquot within that buffer 456 */ 457 STATIC int 458 xfs_qm_dqtobp( 459 xfs_trans_t **tpp, 460 xfs_dquot_t *dqp, 461 xfs_disk_dquot_t **O_ddpp, 462 xfs_buf_t **O_bpp, 463 uint flags) 464 { 465 struct xfs_bmbt_irec map; 466 int nmaps = 1, error; 467 struct xfs_buf *bp; 468 struct xfs_inode *quotip = xfs_dq_to_quota_inode(dqp); 469 struct xfs_mount *mp = dqp->q_mount; 470 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); 471 struct xfs_trans *tp = (tpp ? *tpp : NULL); 472 473 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; 474 475 xfs_ilock(quotip, XFS_ILOCK_SHARED); 476 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) { 477 /* 478 * Return if this type of quotas is turned off while we 479 * didn't have the quota inode lock. 480 */ 481 xfs_iunlock(quotip, XFS_ILOCK_SHARED); 482 return ESRCH; 483 } 484 485 /* 486 * Find the block map; no allocations yet 487 */ 488 error = xfs_bmapi_read(quotip, dqp->q_fileoffset, 489 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); 490 491 xfs_iunlock(quotip, XFS_ILOCK_SHARED); 492 if (error) 493 return error; 494 495 ASSERT(nmaps == 1); 496 ASSERT(map.br_blockcount == 1); 497 498 /* 499 * Offset of dquot in the (fixed sized) dquot chunk. 500 */ 501 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * 502 sizeof(xfs_dqblk_t); 503 504 ASSERT(map.br_startblock != DELAYSTARTBLOCK); 505 if (map.br_startblock == HOLESTARTBLOCK) { 506 /* 507 * We don't allocate unless we're asked to 508 */ 509 if (!(flags & XFS_QMOPT_DQALLOC)) 510 return ENOENT; 511 512 ASSERT(tp); 513 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip, 514 dqp->q_fileoffset, &bp); 515 if (error) 516 return error; 517 tp = *tpp; 518 } else { 519 trace_xfs_dqtobp_read(dqp); 520 521 /* 522 * store the blkno etc so that we don't have to do the 523 * mapping all the time 524 */ 525 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); 526 527 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, 528 dqp->q_blkno, 529 mp->m_quotainfo->qi_dqchunklen, 530 0, &bp, &xfs_dquot_buf_ops); 531 532 if (error == EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) { 533 xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff * 534 mp->m_quotainfo->qi_dqperchunk; 535 ASSERT(bp == NULL); 536 error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp); 537 } 538 539 if (error) { 540 ASSERT(bp == NULL); 541 return XFS_ERROR(error); 542 } 543 } 544 545 ASSERT(xfs_buf_islocked(bp)); 546 *O_bpp = bp; 547 *O_ddpp = bp->b_addr + dqp->q_bufoffset; 548 549 return (0); 550 } 551 552 553 /* 554 * Read in the ondisk dquot using dqtobp() then copy it to an incore version, 555 * and release the buffer immediately. 556 * 557 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed. 558 */ 559 int 560 xfs_qm_dqread( 561 struct xfs_mount *mp, 562 xfs_dqid_t id, 563 uint type, 564 uint flags, 565 struct xfs_dquot **O_dqpp) 566 { 567 struct xfs_dquot *dqp; 568 struct xfs_disk_dquot *ddqp; 569 struct xfs_buf *bp; 570 struct xfs_trans *tp = NULL; 571 int error; 572 int cancelflags = 0; 573 574 575 dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP); 576 577 dqp->dq_flags = type; 578 dqp->q_core.d_id = cpu_to_be32(id); 579 dqp->q_mount = mp; 580 INIT_LIST_HEAD(&dqp->q_lru); 581 mutex_init(&dqp->q_qlock); 582 init_waitqueue_head(&dqp->q_pinwait); 583 584 /* 585 * Because we want to use a counting completion, complete 586 * the flush completion once to allow a single access to 587 * the flush completion without blocking. 588 */ 589 init_completion(&dqp->q_flush); 590 complete(&dqp->q_flush); 591 592 /* 593 * Make sure group quotas have a different lock class than user 594 * quotas. 595 */ 596 switch (type) { 597 case XFS_DQ_USER: 598 /* uses the default lock class */ 599 break; 600 case XFS_DQ_GROUP: 601 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class); 602 break; 603 case XFS_DQ_PROJ: 604 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class); 605 break; 606 default: 607 ASSERT(0); 608 break; 609 } 610 611 XFS_STATS_INC(xs_qm_dquot); 612 613 trace_xfs_dqread(dqp); 614 615 if (flags & XFS_QMOPT_DQALLOC) { 616 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC); 617 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_attrsetm, 618 XFS_QM_DQALLOC_SPACE_RES(mp), 0); 619 if (error) 620 goto error1; 621 cancelflags = XFS_TRANS_RELEASE_LOG_RES; 622 } 623 624 /* 625 * get a pointer to the on-disk dquot and the buffer containing it 626 * dqp already knows its own type (GROUP/USER). 627 */ 628 error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags); 629 if (error) { 630 /* 631 * This can happen if quotas got turned off (ESRCH), 632 * or if the dquot didn't exist on disk and we ask to 633 * allocate (ENOENT). 634 */ 635 trace_xfs_dqread_fail(dqp); 636 cancelflags |= XFS_TRANS_ABORT; 637 goto error1; 638 } 639 640 /* copy everything from disk dquot to the incore dquot */ 641 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t)); 642 xfs_qm_dquot_logitem_init(dqp); 643 644 /* 645 * Reservation counters are defined as reservation plus current usage 646 * to avoid having to add every time. 647 */ 648 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount); 649 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount); 650 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount); 651 652 /* initialize the dquot speculative prealloc thresholds */ 653 xfs_dquot_set_prealloc_limits(dqp); 654 655 /* Mark the buf so that this will stay incore a little longer */ 656 xfs_buf_set_ref(bp, XFS_DQUOT_REF); 657 658 /* 659 * We got the buffer with a xfs_trans_read_buf() (in dqtobp()) 660 * So we need to release with xfs_trans_brelse(). 661 * The strategy here is identical to that of inodes; we lock 662 * the dquot in xfs_qm_dqget() before making it accessible to 663 * others. This is because dquots, like inodes, need a good level of 664 * concurrency, and we don't want to take locks on the entire buffers 665 * for dquot accesses. 666 * Note also that the dquot buffer may even be dirty at this point, if 667 * this particular dquot was repaired. We still aren't afraid to 668 * brelse it because we have the changes incore. 669 */ 670 ASSERT(xfs_buf_islocked(bp)); 671 xfs_trans_brelse(tp, bp); 672 673 if (tp) { 674 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); 675 if (error) 676 goto error0; 677 } 678 679 *O_dqpp = dqp; 680 return error; 681 682 error1: 683 if (tp) 684 xfs_trans_cancel(tp, cancelflags); 685 error0: 686 xfs_qm_dqdestroy(dqp); 687 *O_dqpp = NULL; 688 return error; 689 } 690 691 /* 692 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a 693 * a locked dquot, doing an allocation (if requested) as needed. 694 * When both an inode and an id are given, the inode's id takes precedence. 695 * That is, if the id changes while we don't hold the ilock inside this 696 * function, the new dquot is returned, not necessarily the one requested 697 * in the id argument. 698 */ 699 int 700 xfs_qm_dqget( 701 xfs_mount_t *mp, 702 xfs_inode_t *ip, /* locked inode (optional) */ 703 xfs_dqid_t id, /* uid/projid/gid depending on type */ 704 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */ 705 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */ 706 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */ 707 { 708 struct xfs_quotainfo *qi = mp->m_quotainfo; 709 struct radix_tree_root *tree = xfs_dquot_tree(qi, type); 710 struct xfs_dquot *dqp; 711 int error; 712 713 ASSERT(XFS_IS_QUOTA_RUNNING(mp)); 714 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) || 715 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) || 716 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) { 717 return (ESRCH); 718 } 719 720 #ifdef DEBUG 721 if (xfs_do_dqerror) { 722 if ((xfs_dqerror_target == mp->m_ddev_targp) && 723 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) { 724 xfs_debug(mp, "Returning error in dqget"); 725 return (EIO); 726 } 727 } 728 729 ASSERT(type == XFS_DQ_USER || 730 type == XFS_DQ_PROJ || 731 type == XFS_DQ_GROUP); 732 if (ip) { 733 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 734 ASSERT(xfs_inode_dquot(ip, type) == NULL); 735 } 736 #endif 737 738 restart: 739 mutex_lock(&qi->qi_tree_lock); 740 dqp = radix_tree_lookup(tree, id); 741 if (dqp) { 742 xfs_dqlock(dqp); 743 if (dqp->dq_flags & XFS_DQ_FREEING) { 744 xfs_dqunlock(dqp); 745 mutex_unlock(&qi->qi_tree_lock); 746 trace_xfs_dqget_freeing(dqp); 747 delay(1); 748 goto restart; 749 } 750 751 dqp->q_nrefs++; 752 mutex_unlock(&qi->qi_tree_lock); 753 754 trace_xfs_dqget_hit(dqp); 755 XFS_STATS_INC(xs_qm_dqcachehits); 756 *O_dqpp = dqp; 757 return 0; 758 } 759 mutex_unlock(&qi->qi_tree_lock); 760 XFS_STATS_INC(xs_qm_dqcachemisses); 761 762 /* 763 * Dquot cache miss. We don't want to keep the inode lock across 764 * a (potential) disk read. Also we don't want to deal with the lock 765 * ordering between quotainode and this inode. OTOH, dropping the inode 766 * lock here means dealing with a chown that can happen before 767 * we re-acquire the lock. 768 */ 769 if (ip) 770 xfs_iunlock(ip, XFS_ILOCK_EXCL); 771 772 error = xfs_qm_dqread(mp, id, type, flags, &dqp); 773 774 if (ip) 775 xfs_ilock(ip, XFS_ILOCK_EXCL); 776 777 if (error) 778 return error; 779 780 if (ip) { 781 /* 782 * A dquot could be attached to this inode by now, since 783 * we had dropped the ilock. 784 */ 785 if (xfs_this_quota_on(mp, type)) { 786 struct xfs_dquot *dqp1; 787 788 dqp1 = xfs_inode_dquot(ip, type); 789 if (dqp1) { 790 xfs_qm_dqdestroy(dqp); 791 dqp = dqp1; 792 xfs_dqlock(dqp); 793 goto dqret; 794 } 795 } else { 796 /* inode stays locked on return */ 797 xfs_qm_dqdestroy(dqp); 798 return XFS_ERROR(ESRCH); 799 } 800 } 801 802 mutex_lock(&qi->qi_tree_lock); 803 error = -radix_tree_insert(tree, id, dqp); 804 if (unlikely(error)) { 805 WARN_ON(error != EEXIST); 806 807 /* 808 * Duplicate found. Just throw away the new dquot and start 809 * over. 810 */ 811 mutex_unlock(&qi->qi_tree_lock); 812 trace_xfs_dqget_dup(dqp); 813 xfs_qm_dqdestroy(dqp); 814 XFS_STATS_INC(xs_qm_dquot_dups); 815 goto restart; 816 } 817 818 /* 819 * We return a locked dquot to the caller, with a reference taken 820 */ 821 xfs_dqlock(dqp); 822 dqp->q_nrefs = 1; 823 824 qi->qi_dquots++; 825 mutex_unlock(&qi->qi_tree_lock); 826 827 dqret: 828 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL)); 829 trace_xfs_dqget_miss(dqp); 830 *O_dqpp = dqp; 831 return (0); 832 } 833 834 835 STATIC void 836 xfs_qm_dqput_final( 837 struct xfs_dquot *dqp) 838 { 839 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo; 840 struct xfs_dquot *gdqp; 841 struct xfs_dquot *pdqp; 842 843 trace_xfs_dqput_free(dqp); 844 845 if (list_lru_add(&qi->qi_lru, &dqp->q_lru)) 846 XFS_STATS_INC(xs_qm_dquot_unused); 847 848 /* 849 * If we just added a udquot to the freelist, then we want to release 850 * the gdquot/pdquot reference that it (probably) has. Otherwise it'll 851 * keep the gdquot/pdquot from getting reclaimed. 852 */ 853 gdqp = dqp->q_gdquot; 854 if (gdqp) { 855 xfs_dqlock(gdqp); 856 dqp->q_gdquot = NULL; 857 } 858 859 pdqp = dqp->q_pdquot; 860 if (pdqp) { 861 xfs_dqlock(pdqp); 862 dqp->q_pdquot = NULL; 863 } 864 xfs_dqunlock(dqp); 865 866 /* 867 * If we had a group/project quota hint, release it now. 868 */ 869 if (gdqp) 870 xfs_qm_dqput(gdqp); 871 if (pdqp) 872 xfs_qm_dqput(pdqp); 873 } 874 875 /* 876 * Release a reference to the dquot (decrement ref-count) and unlock it. 877 * 878 * If there is a group quota attached to this dquot, carefully release that 879 * too without tripping over deadlocks'n'stuff. 880 */ 881 void 882 xfs_qm_dqput( 883 struct xfs_dquot *dqp) 884 { 885 ASSERT(dqp->q_nrefs > 0); 886 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 887 888 trace_xfs_dqput(dqp); 889 890 if (--dqp->q_nrefs > 0) 891 xfs_dqunlock(dqp); 892 else 893 xfs_qm_dqput_final(dqp); 894 } 895 896 /* 897 * Release a dquot. Flush it if dirty, then dqput() it. 898 * dquot must not be locked. 899 */ 900 void 901 xfs_qm_dqrele( 902 xfs_dquot_t *dqp) 903 { 904 if (!dqp) 905 return; 906 907 trace_xfs_dqrele(dqp); 908 909 xfs_dqlock(dqp); 910 /* 911 * We don't care to flush it if the dquot is dirty here. 912 * That will create stutters that we want to avoid. 913 * Instead we do a delayed write when we try to reclaim 914 * a dirty dquot. Also xfs_sync will take part of the burden... 915 */ 916 xfs_qm_dqput(dqp); 917 } 918 919 /* 920 * This is the dquot flushing I/O completion routine. It is called 921 * from interrupt level when the buffer containing the dquot is 922 * flushed to disk. It is responsible for removing the dquot logitem 923 * from the AIL if it has not been re-logged, and unlocking the dquot's 924 * flush lock. This behavior is very similar to that of inodes.. 925 */ 926 STATIC void 927 xfs_qm_dqflush_done( 928 struct xfs_buf *bp, 929 struct xfs_log_item *lip) 930 { 931 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip; 932 xfs_dquot_t *dqp = qip->qli_dquot; 933 struct xfs_ail *ailp = lip->li_ailp; 934 935 /* 936 * We only want to pull the item from the AIL if its 937 * location in the log has not changed since we started the flush. 938 * Thus, we only bother if the dquot's lsn has 939 * not changed. First we check the lsn outside the lock 940 * since it's cheaper, and then we recheck while 941 * holding the lock before removing the dquot from the AIL. 942 */ 943 if ((lip->li_flags & XFS_LI_IN_AIL) && 944 lip->li_lsn == qip->qli_flush_lsn) { 945 946 /* xfs_trans_ail_delete() drops the AIL lock. */ 947 spin_lock(&ailp->xa_lock); 948 if (lip->li_lsn == qip->qli_flush_lsn) 949 xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE); 950 else 951 spin_unlock(&ailp->xa_lock); 952 } 953 954 /* 955 * Release the dq's flush lock since we're done with it. 956 */ 957 xfs_dqfunlock(dqp); 958 } 959 960 /* 961 * Write a modified dquot to disk. 962 * The dquot must be locked and the flush lock too taken by caller. 963 * The flush lock will not be unlocked until the dquot reaches the disk, 964 * but the dquot is free to be unlocked and modified by the caller 965 * in the interim. Dquot is still locked on return. This behavior is 966 * identical to that of inodes. 967 */ 968 int 969 xfs_qm_dqflush( 970 struct xfs_dquot *dqp, 971 struct xfs_buf **bpp) 972 { 973 struct xfs_mount *mp = dqp->q_mount; 974 struct xfs_buf *bp; 975 struct xfs_disk_dquot *ddqp; 976 int error; 977 978 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 979 ASSERT(!completion_done(&dqp->q_flush)); 980 981 trace_xfs_dqflush(dqp); 982 983 *bpp = NULL; 984 985 xfs_qm_dqunpin_wait(dqp); 986 987 /* 988 * This may have been unpinned because the filesystem is shutting 989 * down forcibly. If that's the case we must not write this dquot 990 * to disk, because the log record didn't make it to disk. 991 * 992 * We also have to remove the log item from the AIL in this case, 993 * as we wait for an emptry AIL as part of the unmount process. 994 */ 995 if (XFS_FORCED_SHUTDOWN(mp)) { 996 struct xfs_log_item *lip = &dqp->q_logitem.qli_item; 997 dqp->dq_flags &= ~XFS_DQ_DIRTY; 998 999 spin_lock(&mp->m_ail->xa_lock); 1000 if (lip->li_flags & XFS_LI_IN_AIL) 1001 xfs_trans_ail_delete(mp->m_ail, lip, 1002 SHUTDOWN_CORRUPT_INCORE); 1003 else 1004 spin_unlock(&mp->m_ail->xa_lock); 1005 error = XFS_ERROR(EIO); 1006 goto out_unlock; 1007 } 1008 1009 /* 1010 * Get the buffer containing the on-disk dquot 1011 */ 1012 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, 1013 mp->m_quotainfo->qi_dqchunklen, 0, &bp, NULL); 1014 if (error) 1015 goto out_unlock; 1016 1017 /* 1018 * Calculate the location of the dquot inside the buffer. 1019 */ 1020 ddqp = bp->b_addr + dqp->q_bufoffset; 1021 1022 /* 1023 * A simple sanity check in case we got a corrupted dquot.. 1024 */ 1025 error = xfs_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0, 1026 XFS_QMOPT_DOWARN, "dqflush (incore copy)"); 1027 if (error) { 1028 xfs_buf_relse(bp); 1029 xfs_dqfunlock(dqp); 1030 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1031 return XFS_ERROR(EIO); 1032 } 1033 1034 /* This is the only portion of data that needs to persist */ 1035 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t)); 1036 1037 /* 1038 * Clear the dirty field and remember the flush lsn for later use. 1039 */ 1040 dqp->dq_flags &= ~XFS_DQ_DIRTY; 1041 1042 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn, 1043 &dqp->q_logitem.qli_item.li_lsn); 1044 1045 /* 1046 * copy the lsn into the on-disk dquot now while we have the in memory 1047 * dquot here. This can't be done later in the write verifier as we 1048 * can't get access to the log item at that point in time. 1049 * 1050 * We also calculate the CRC here so that the on-disk dquot in the 1051 * buffer always has a valid CRC. This ensures there is no possibility 1052 * of a dquot without an up-to-date CRC getting to disk. 1053 */ 1054 if (xfs_sb_version_hascrc(&mp->m_sb)) { 1055 struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp; 1056 1057 dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn); 1058 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk), 1059 XFS_DQUOT_CRC_OFF); 1060 } 1061 1062 /* 1063 * Attach an iodone routine so that we can remove this dquot from the 1064 * AIL and release the flush lock once the dquot is synced to disk. 1065 */ 1066 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done, 1067 &dqp->q_logitem.qli_item); 1068 1069 /* 1070 * If the buffer is pinned then push on the log so we won't 1071 * get stuck waiting in the write for too long. 1072 */ 1073 if (xfs_buf_ispinned(bp)) { 1074 trace_xfs_dqflush_force(dqp); 1075 xfs_log_force(mp, 0); 1076 } 1077 1078 trace_xfs_dqflush_done(dqp); 1079 *bpp = bp; 1080 return 0; 1081 1082 out_unlock: 1083 xfs_dqfunlock(dqp); 1084 return XFS_ERROR(EIO); 1085 } 1086 1087 /* 1088 * Lock two xfs_dquot structures. 1089 * 1090 * To avoid deadlocks we always lock the quota structure with 1091 * the lowerd id first. 1092 */ 1093 void 1094 xfs_dqlock2( 1095 xfs_dquot_t *d1, 1096 xfs_dquot_t *d2) 1097 { 1098 if (d1 && d2) { 1099 ASSERT(d1 != d2); 1100 if (be32_to_cpu(d1->q_core.d_id) > 1101 be32_to_cpu(d2->q_core.d_id)) { 1102 mutex_lock(&d2->q_qlock); 1103 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED); 1104 } else { 1105 mutex_lock(&d1->q_qlock); 1106 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED); 1107 } 1108 } else if (d1) { 1109 mutex_lock(&d1->q_qlock); 1110 } else if (d2) { 1111 mutex_lock(&d2->q_qlock); 1112 } 1113 } 1114 1115 int __init 1116 xfs_qm_init(void) 1117 { 1118 xfs_qm_dqzone = 1119 kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot"); 1120 if (!xfs_qm_dqzone) 1121 goto out; 1122 1123 xfs_qm_dqtrxzone = 1124 kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx"); 1125 if (!xfs_qm_dqtrxzone) 1126 goto out_free_dqzone; 1127 1128 return 0; 1129 1130 out_free_dqzone: 1131 kmem_zone_destroy(xfs_qm_dqzone); 1132 out: 1133 return -ENOMEM; 1134 } 1135 1136 void 1137 xfs_qm_exit(void) 1138 { 1139 kmem_zone_destroy(xfs_qm_dqtrxzone); 1140 kmem_zone_destroy(xfs_qm_dqzone); 1141 } 1142