1 /* 2 * Copyright (c) 2000-2005 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_types.h" 21 #include "xfs_log.h" 22 #include "xfs_trans.h" 23 #include "xfs_sb.h" 24 #include "xfs_ag.h" 25 #include "xfs_mount.h" 26 #include "xfs_bmap_btree.h" 27 #include "xfs_alloc_btree.h" 28 #include "xfs_ialloc_btree.h" 29 #include "xfs_dinode.h" 30 #include "xfs_inode.h" 31 #include "xfs_inode_item.h" 32 #include "xfs_btree.h" 33 #include "xfs_error.h" 34 #include "xfs_alloc.h" 35 #include "xfs_ialloc.h" 36 #include "xfs_fsops.h" 37 #include "xfs_itable.h" 38 #include "xfs_trans_space.h" 39 #include "xfs_rtalloc.h" 40 #include "xfs_filestream.h" 41 #include "xfs_trace.h" 42 43 /* 44 * File system operations 45 */ 46 47 int 48 xfs_fs_geometry( 49 xfs_mount_t *mp, 50 xfs_fsop_geom_t *geo, 51 int new_version) 52 { 53 54 memset(geo, 0, sizeof(*geo)); 55 56 geo->blocksize = mp->m_sb.sb_blocksize; 57 geo->rtextsize = mp->m_sb.sb_rextsize; 58 geo->agblocks = mp->m_sb.sb_agblocks; 59 geo->agcount = mp->m_sb.sb_agcount; 60 geo->logblocks = mp->m_sb.sb_logblocks; 61 geo->sectsize = mp->m_sb.sb_sectsize; 62 geo->inodesize = mp->m_sb.sb_inodesize; 63 geo->imaxpct = mp->m_sb.sb_imax_pct; 64 geo->datablocks = mp->m_sb.sb_dblocks; 65 geo->rtblocks = mp->m_sb.sb_rblocks; 66 geo->rtextents = mp->m_sb.sb_rextents; 67 geo->logstart = mp->m_sb.sb_logstart; 68 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 69 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 70 if (new_version >= 2) { 71 geo->sunit = mp->m_sb.sb_unit; 72 geo->swidth = mp->m_sb.sb_width; 73 } 74 if (new_version >= 3) { 75 geo->version = XFS_FSOP_GEOM_VERSION; 76 geo->flags = 77 (xfs_sb_version_hasattr(&mp->m_sb) ? 78 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 79 (xfs_sb_version_hasnlink(&mp->m_sb) ? 80 XFS_FSOP_GEOM_FLAGS_NLINK : 0) | 81 (xfs_sb_version_hasquota(&mp->m_sb) ? 82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 83 (xfs_sb_version_hasalign(&mp->m_sb) ? 84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 85 (xfs_sb_version_hasdalign(&mp->m_sb) ? 86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 87 (xfs_sb_version_hasshared(&mp->m_sb) ? 88 XFS_FSOP_GEOM_FLAGS_SHARED : 0) | 89 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 90 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 91 (xfs_sb_version_hasdirv2(&mp->m_sb) ? 92 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) | 93 (xfs_sb_version_hassector(&mp->m_sb) ? 94 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 95 (xfs_sb_version_hasasciici(&mp->m_sb) ? 96 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 97 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 98 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 99 (xfs_sb_version_hasattr2(&mp->m_sb) ? 100 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0); 101 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 102 mp->m_sb.sb_logsectsize : BBSIZE; 103 geo->rtsectsize = mp->m_sb.sb_blocksize; 104 geo->dirblocksize = mp->m_dirblksize; 105 } 106 if (new_version >= 4) { 107 geo->flags |= 108 (xfs_sb_version_haslogv2(&mp->m_sb) ? 109 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 110 geo->logsunit = mp->m_sb.sb_logsunit; 111 } 112 return 0; 113 } 114 115 static int 116 xfs_growfs_data_private( 117 xfs_mount_t *mp, /* mount point for filesystem */ 118 xfs_growfs_data_t *in) /* growfs data input struct */ 119 { 120 xfs_agf_t *agf; 121 xfs_agi_t *agi; 122 xfs_agnumber_t agno; 123 xfs_extlen_t agsize; 124 xfs_extlen_t tmpsize; 125 xfs_alloc_rec_t *arec; 126 struct xfs_btree_block *block; 127 xfs_buf_t *bp; 128 int bucket; 129 int dpct; 130 int error; 131 xfs_agnumber_t nagcount; 132 xfs_agnumber_t nagimax = 0; 133 xfs_rfsblock_t nb, nb_mod; 134 xfs_rfsblock_t new; 135 xfs_rfsblock_t nfree; 136 xfs_agnumber_t oagcount; 137 int pct; 138 xfs_trans_t *tp; 139 140 nb = in->newblocks; 141 pct = in->imaxpct; 142 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 143 return XFS_ERROR(EINVAL); 144 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 145 return error; 146 dpct = pct - mp->m_sb.sb_imax_pct; 147 bp = xfs_buf_read_uncached(mp->m_ddev_targp, 148 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 149 XFS_FSS_TO_BB(mp, 1), 0); 150 if (!bp) 151 return EIO; 152 xfs_buf_relse(bp); 153 154 new = nb; /* use new as a temporary here */ 155 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 156 nagcount = new + (nb_mod != 0); 157 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 158 nagcount--; 159 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 160 if (nb < mp->m_sb.sb_dblocks) 161 return XFS_ERROR(EINVAL); 162 } 163 new = nb - mp->m_sb.sb_dblocks; 164 oagcount = mp->m_sb.sb_agcount; 165 166 /* allocate the new per-ag structures */ 167 if (nagcount > oagcount) { 168 error = xfs_initialize_perag(mp, nagcount, &nagimax); 169 if (error) 170 return error; 171 } 172 173 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 174 tp->t_flags |= XFS_TRANS_RESERVE; 175 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 176 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 177 xfs_trans_cancel(tp, 0); 178 return error; 179 } 180 181 /* 182 * Write new AG headers to disk. Non-transactional, but written 183 * synchronously so they are completed prior to the growfs transaction 184 * being logged. 185 */ 186 nfree = 0; 187 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 188 /* 189 * AG freelist header block 190 */ 191 bp = xfs_buf_get(mp->m_ddev_targp, 192 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 193 XFS_FSS_TO_BB(mp, 1), 0); 194 if (!bp) { 195 error = ENOMEM; 196 goto error0; 197 } 198 agf = XFS_BUF_TO_AGF(bp); 199 memset(agf, 0, mp->m_sb.sb_sectsize); 200 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 201 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 202 agf->agf_seqno = cpu_to_be32(agno); 203 if (agno == nagcount - 1) 204 agsize = 205 nb - 206 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 207 else 208 agsize = mp->m_sb.sb_agblocks; 209 agf->agf_length = cpu_to_be32(agsize); 210 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 211 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 212 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 213 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 214 agf->agf_flfirst = 0; 215 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 216 agf->agf_flcount = 0; 217 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 218 agf->agf_freeblks = cpu_to_be32(tmpsize); 219 agf->agf_longest = cpu_to_be32(tmpsize); 220 error = xfs_bwrite(bp); 221 xfs_buf_relse(bp); 222 if (error) 223 goto error0; 224 225 /* 226 * AG inode header block 227 */ 228 bp = xfs_buf_get(mp->m_ddev_targp, 229 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 230 XFS_FSS_TO_BB(mp, 1), 0); 231 if (!bp) { 232 error = ENOMEM; 233 goto error0; 234 } 235 agi = XFS_BUF_TO_AGI(bp); 236 memset(agi, 0, mp->m_sb.sb_sectsize); 237 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 238 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 239 agi->agi_seqno = cpu_to_be32(agno); 240 agi->agi_length = cpu_to_be32(agsize); 241 agi->agi_count = 0; 242 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 243 agi->agi_level = cpu_to_be32(1); 244 agi->agi_freecount = 0; 245 agi->agi_newino = cpu_to_be32(NULLAGINO); 246 agi->agi_dirino = cpu_to_be32(NULLAGINO); 247 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 248 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 249 error = xfs_bwrite(bp); 250 xfs_buf_relse(bp); 251 if (error) 252 goto error0; 253 254 /* 255 * BNO btree root block 256 */ 257 bp = xfs_buf_get(mp->m_ddev_targp, 258 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 259 BTOBB(mp->m_sb.sb_blocksize), 0); 260 if (!bp) { 261 error = ENOMEM; 262 goto error0; 263 } 264 block = XFS_BUF_TO_BLOCK(bp); 265 memset(block, 0, mp->m_sb.sb_blocksize); 266 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 267 block->bb_level = 0; 268 block->bb_numrecs = cpu_to_be16(1); 269 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 270 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 271 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 272 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 273 arec->ar_blockcount = cpu_to_be32( 274 agsize - be32_to_cpu(arec->ar_startblock)); 275 error = xfs_bwrite(bp); 276 xfs_buf_relse(bp); 277 if (error) 278 goto error0; 279 280 /* 281 * CNT btree root block 282 */ 283 bp = xfs_buf_get(mp->m_ddev_targp, 284 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 285 BTOBB(mp->m_sb.sb_blocksize), 0); 286 if (!bp) { 287 error = ENOMEM; 288 goto error0; 289 } 290 block = XFS_BUF_TO_BLOCK(bp); 291 memset(block, 0, mp->m_sb.sb_blocksize); 292 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 293 block->bb_level = 0; 294 block->bb_numrecs = cpu_to_be16(1); 295 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 296 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 297 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 298 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 299 arec->ar_blockcount = cpu_to_be32( 300 agsize - be32_to_cpu(arec->ar_startblock)); 301 nfree += be32_to_cpu(arec->ar_blockcount); 302 error = xfs_bwrite(bp); 303 xfs_buf_relse(bp); 304 if (error) 305 goto error0; 306 307 /* 308 * INO btree root block 309 */ 310 bp = xfs_buf_get(mp->m_ddev_targp, 311 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 312 BTOBB(mp->m_sb.sb_blocksize), 0); 313 if (!bp) { 314 error = ENOMEM; 315 goto error0; 316 } 317 block = XFS_BUF_TO_BLOCK(bp); 318 memset(block, 0, mp->m_sb.sb_blocksize); 319 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 320 block->bb_level = 0; 321 block->bb_numrecs = 0; 322 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 323 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 324 error = xfs_bwrite(bp); 325 xfs_buf_relse(bp); 326 if (error) 327 goto error0; 328 } 329 xfs_trans_agblocks_delta(tp, nfree); 330 /* 331 * There are new blocks in the old last a.g. 332 */ 333 if (new) { 334 /* 335 * Change the agi length. 336 */ 337 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 338 if (error) { 339 goto error0; 340 } 341 ASSERT(bp); 342 agi = XFS_BUF_TO_AGI(bp); 343 be32_add_cpu(&agi->agi_length, new); 344 ASSERT(nagcount == oagcount || 345 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 346 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 347 /* 348 * Change agf length. 349 */ 350 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 351 if (error) { 352 goto error0; 353 } 354 ASSERT(bp); 355 agf = XFS_BUF_TO_AGF(bp); 356 be32_add_cpu(&agf->agf_length, new); 357 ASSERT(be32_to_cpu(agf->agf_length) == 358 be32_to_cpu(agi->agi_length)); 359 360 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 361 /* 362 * Free the new space. 363 */ 364 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 365 be32_to_cpu(agf->agf_length) - new), new); 366 if (error) { 367 goto error0; 368 } 369 } 370 371 /* 372 * Update changed superblock fields transactionally. These are not 373 * seen by the rest of the world until the transaction commit applies 374 * them atomically to the superblock. 375 */ 376 if (nagcount > oagcount) 377 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 378 if (nb > mp->m_sb.sb_dblocks) 379 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 380 nb - mp->m_sb.sb_dblocks); 381 if (nfree) 382 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 383 if (dpct) 384 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 385 error = xfs_trans_commit(tp, 0); 386 if (error) 387 return error; 388 389 /* New allocation groups fully initialized, so update mount struct */ 390 if (nagimax) 391 mp->m_maxagi = nagimax; 392 if (mp->m_sb.sb_imax_pct) { 393 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 394 do_div(icount, 100); 395 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 396 } else 397 mp->m_maxicount = 0; 398 xfs_set_low_space_thresholds(mp); 399 400 /* update secondary superblocks. */ 401 for (agno = 1; agno < nagcount; agno++) { 402 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 403 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 404 XFS_FSS_TO_BB(mp, 1), 0, &bp); 405 if (error) { 406 xfs_warn(mp, 407 "error %d reading secondary superblock for ag %d", 408 error, agno); 409 break; 410 } 411 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 412 /* 413 * If we get an error writing out the alternate superblocks, 414 * just issue a warning and continue. The real work is 415 * already done and committed. 416 */ 417 error = xfs_bwrite(bp); 418 xfs_buf_relse(bp); 419 if (error) { 420 xfs_warn(mp, 421 "write error %d updating secondary superblock for ag %d", 422 error, agno); 423 break; /* no point in continuing */ 424 } 425 } 426 return 0; 427 428 error0: 429 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 430 return error; 431 } 432 433 static int 434 xfs_growfs_log_private( 435 xfs_mount_t *mp, /* mount point for filesystem */ 436 xfs_growfs_log_t *in) /* growfs log input struct */ 437 { 438 xfs_extlen_t nb; 439 440 nb = in->newblocks; 441 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 442 return XFS_ERROR(EINVAL); 443 if (nb == mp->m_sb.sb_logblocks && 444 in->isint == (mp->m_sb.sb_logstart != 0)) 445 return XFS_ERROR(EINVAL); 446 /* 447 * Moving the log is hard, need new interfaces to sync 448 * the log first, hold off all activity while moving it. 449 * Can have shorter or longer log in the same space, 450 * or transform internal to external log or vice versa. 451 */ 452 return XFS_ERROR(ENOSYS); 453 } 454 455 /* 456 * protected versions of growfs function acquire and release locks on the mount 457 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 458 * XFS_IOC_FSGROWFSRT 459 */ 460 461 462 int 463 xfs_growfs_data( 464 xfs_mount_t *mp, 465 xfs_growfs_data_t *in) 466 { 467 int error; 468 469 if (!capable(CAP_SYS_ADMIN)) 470 return XFS_ERROR(EPERM); 471 if (!mutex_trylock(&mp->m_growlock)) 472 return XFS_ERROR(EWOULDBLOCK); 473 error = xfs_growfs_data_private(mp, in); 474 mutex_unlock(&mp->m_growlock); 475 return error; 476 } 477 478 int 479 xfs_growfs_log( 480 xfs_mount_t *mp, 481 xfs_growfs_log_t *in) 482 { 483 int error; 484 485 if (!capable(CAP_SYS_ADMIN)) 486 return XFS_ERROR(EPERM); 487 if (!mutex_trylock(&mp->m_growlock)) 488 return XFS_ERROR(EWOULDBLOCK); 489 error = xfs_growfs_log_private(mp, in); 490 mutex_unlock(&mp->m_growlock); 491 return error; 492 } 493 494 /* 495 * exported through ioctl XFS_IOC_FSCOUNTS 496 */ 497 498 int 499 xfs_fs_counts( 500 xfs_mount_t *mp, 501 xfs_fsop_counts_t *cnt) 502 { 503 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 504 spin_lock(&mp->m_sb_lock); 505 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 506 cnt->freertx = mp->m_sb.sb_frextents; 507 cnt->freeino = mp->m_sb.sb_ifree; 508 cnt->allocino = mp->m_sb.sb_icount; 509 spin_unlock(&mp->m_sb_lock); 510 return 0; 511 } 512 513 /* 514 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 515 * 516 * xfs_reserve_blocks is called to set m_resblks 517 * in the in-core mount table. The number of unused reserved blocks 518 * is kept in m_resblks_avail. 519 * 520 * Reserve the requested number of blocks if available. Otherwise return 521 * as many as possible to satisfy the request. The actual number 522 * reserved are returned in outval 523 * 524 * A null inval pointer indicates that only the current reserved blocks 525 * available should be returned no settings are changed. 526 */ 527 528 int 529 xfs_reserve_blocks( 530 xfs_mount_t *mp, 531 __uint64_t *inval, 532 xfs_fsop_resblks_t *outval) 533 { 534 __int64_t lcounter, delta, fdblks_delta; 535 __uint64_t request; 536 537 /* If inval is null, report current values and return */ 538 if (inval == (__uint64_t *)NULL) { 539 if (!outval) 540 return EINVAL; 541 outval->resblks = mp->m_resblks; 542 outval->resblks_avail = mp->m_resblks_avail; 543 return 0; 544 } 545 546 request = *inval; 547 548 /* 549 * With per-cpu counters, this becomes an interesting 550 * problem. we needto work out if we are freeing or allocation 551 * blocks first, then we can do the modification as necessary. 552 * 553 * We do this under the m_sb_lock so that if we are near 554 * ENOSPC, we will hold out any changes while we work out 555 * what to do. This means that the amount of free space can 556 * change while we do this, so we need to retry if we end up 557 * trying to reserve more space than is available. 558 * 559 * We also use the xfs_mod_incore_sb() interface so that we 560 * don't have to care about whether per cpu counter are 561 * enabled, disabled or even compiled in.... 562 */ 563 retry: 564 spin_lock(&mp->m_sb_lock); 565 xfs_icsb_sync_counters_locked(mp, 0); 566 567 /* 568 * If our previous reservation was larger than the current value, 569 * then move any unused blocks back to the free pool. 570 */ 571 fdblks_delta = 0; 572 if (mp->m_resblks > request) { 573 lcounter = mp->m_resblks_avail - request; 574 if (lcounter > 0) { /* release unused blocks */ 575 fdblks_delta = lcounter; 576 mp->m_resblks_avail -= lcounter; 577 } 578 mp->m_resblks = request; 579 } else { 580 __int64_t free; 581 582 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 583 if (!free) 584 goto out; /* ENOSPC and fdblks_delta = 0 */ 585 586 delta = request - mp->m_resblks; 587 lcounter = free - delta; 588 if (lcounter < 0) { 589 /* We can't satisfy the request, just get what we can */ 590 mp->m_resblks += free; 591 mp->m_resblks_avail += free; 592 fdblks_delta = -free; 593 } else { 594 fdblks_delta = -delta; 595 mp->m_resblks = request; 596 mp->m_resblks_avail += delta; 597 } 598 } 599 out: 600 if (outval) { 601 outval->resblks = mp->m_resblks; 602 outval->resblks_avail = mp->m_resblks_avail; 603 } 604 spin_unlock(&mp->m_sb_lock); 605 606 if (fdblks_delta) { 607 /* 608 * If we are putting blocks back here, m_resblks_avail is 609 * already at its max so this will put it in the free pool. 610 * 611 * If we need space, we'll either succeed in getting it 612 * from the free block count or we'll get an enospc. If 613 * we get a ENOSPC, it means things changed while we were 614 * calculating fdblks_delta and so we should try again to 615 * see if there is anything left to reserve. 616 * 617 * Don't set the reserved flag here - we don't want to reserve 618 * the extra reserve blocks from the reserve..... 619 */ 620 int error; 621 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, 622 fdblks_delta, 0); 623 if (error == ENOSPC) 624 goto retry; 625 } 626 return 0; 627 } 628 629 /* 630 * Dump a transaction into the log that contains no real change. This is needed 631 * to be able to make the log dirty or stamp the current tail LSN into the log 632 * during the covering operation. 633 * 634 * We cannot use an inode here for this - that will push dirty state back up 635 * into the VFS and then periodic inode flushing will prevent log covering from 636 * making progress. Hence we log a field in the superblock instead and use a 637 * synchronous transaction to ensure the superblock is immediately unpinned 638 * and can be written back. 639 */ 640 int 641 xfs_fs_log_dummy( 642 xfs_mount_t *mp) 643 { 644 xfs_trans_t *tp; 645 int error; 646 647 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 648 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, 649 XFS_DEFAULT_LOG_COUNT); 650 if (error) { 651 xfs_trans_cancel(tp, 0); 652 return error; 653 } 654 655 /* log the UUID because it is an unchanging field */ 656 xfs_mod_sb(tp, XFS_SB_UUID); 657 xfs_trans_set_sync(tp); 658 return xfs_trans_commit(tp, 0); 659 } 660 661 int 662 xfs_fs_goingdown( 663 xfs_mount_t *mp, 664 __uint32_t inflags) 665 { 666 switch (inflags) { 667 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 668 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 669 670 if (sb && !IS_ERR(sb)) { 671 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 672 thaw_bdev(sb->s_bdev, sb); 673 } 674 675 break; 676 } 677 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 678 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 679 break; 680 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 681 xfs_force_shutdown(mp, 682 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 683 break; 684 default: 685 return XFS_ERROR(EINVAL); 686 } 687 688 return 0; 689 } 690 691 /* 692 * Force a shutdown of the filesystem instantly while keeping the filesystem 693 * consistent. We don't do an unmount here; just shutdown the shop, make sure 694 * that absolutely nothing persistent happens to this filesystem after this 695 * point. 696 */ 697 void 698 xfs_do_force_shutdown( 699 xfs_mount_t *mp, 700 int flags, 701 char *fname, 702 int lnnum) 703 { 704 int logerror; 705 706 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 707 708 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 709 xfs_notice(mp, 710 "%s(0x%x) called from line %d of file %s. Return address = 0x%p", 711 __func__, flags, lnnum, fname, __return_address); 712 } 713 /* 714 * No need to duplicate efforts. 715 */ 716 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 717 return; 718 719 /* 720 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 721 * queue up anybody new on the log reservations, and wakes up 722 * everybody who's sleeping on log reservations to tell them 723 * the bad news. 724 */ 725 if (xfs_log_force_umount(mp, logerror)) 726 return; 727 728 if (flags & SHUTDOWN_CORRUPT_INCORE) { 729 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 730 "Corruption of in-memory data detected. Shutting down filesystem"); 731 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 732 xfs_stack_trace(); 733 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 734 if (logerror) { 735 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 736 "Log I/O Error Detected. Shutting down filesystem"); 737 } else if (flags & SHUTDOWN_DEVICE_REQ) { 738 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 739 "All device paths lost. Shutting down filesystem"); 740 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 741 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 742 "I/O Error Detected. Shutting down filesystem"); 743 } 744 } 745 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 746 xfs_alert(mp, 747 "Please umount the filesystem and rectify the problem(s)"); 748 } 749 } 750