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_bit.h" 22 #include "xfs_inum.h" 23 #include "xfs_log.h" 24 #include "xfs_trans.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_mount.h" 28 #include "xfs_bmap_btree.h" 29 #include "xfs_alloc_btree.h" 30 #include "xfs_ialloc_btree.h" 31 #include "xfs_dinode.h" 32 #include "xfs_inode.h" 33 #include "xfs_inode_item.h" 34 #include "xfs_btree.h" 35 #include "xfs_error.h" 36 #include "xfs_alloc.h" 37 #include "xfs_ialloc.h" 38 #include "xfs_fsops.h" 39 #include "xfs_itable.h" 40 #include "xfs_trans_space.h" 41 #include "xfs_rtalloc.h" 42 #include "xfs_rw.h" 43 #include "xfs_filestream.h" 44 #include "xfs_trace.h" 45 46 /* 47 * File system operations 48 */ 49 50 int 51 xfs_fs_geometry( 52 xfs_mount_t *mp, 53 xfs_fsop_geom_t *geo, 54 int new_version) 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 error = xfs_read_buf(mp, 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, &bp); 150 if (error) 151 return error; 152 ASSERT(bp); 153 xfs_buf_relse(bp); 154 155 new = nb; /* use new as a temporary here */ 156 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 157 nagcount = new + (nb_mod != 0); 158 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 159 nagcount--; 160 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 161 if (nb < mp->m_sb.sb_dblocks) 162 return XFS_ERROR(EINVAL); 163 } 164 new = nb - mp->m_sb.sb_dblocks; 165 oagcount = mp->m_sb.sb_agcount; 166 167 /* allocate the new per-ag structures */ 168 if (nagcount > oagcount) { 169 error = xfs_initialize_perag(mp, nagcount, &nagimax); 170 if (error) 171 return error; 172 } 173 174 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 175 tp->t_flags |= XFS_TRANS_RESERVE; 176 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 177 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 178 xfs_trans_cancel(tp, 0); 179 return error; 180 } 181 182 /* 183 * Write new AG headers to disk. Non-transactional, but written 184 * synchronously so they are completed prior to the growfs transaction 185 * being logged. 186 */ 187 nfree = 0; 188 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 189 /* 190 * AG freelist header block 191 */ 192 bp = xfs_buf_get(mp->m_ddev_targp, 193 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 194 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED); 195 agf = XFS_BUF_TO_AGF(bp); 196 memset(agf, 0, mp->m_sb.sb_sectsize); 197 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 198 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 199 agf->agf_seqno = cpu_to_be32(agno); 200 if (agno == nagcount - 1) 201 agsize = 202 nb - 203 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 204 else 205 agsize = mp->m_sb.sb_agblocks; 206 agf->agf_length = cpu_to_be32(agsize); 207 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 208 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 209 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 210 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 211 agf->agf_flfirst = 0; 212 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 213 agf->agf_flcount = 0; 214 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 215 agf->agf_freeblks = cpu_to_be32(tmpsize); 216 agf->agf_longest = cpu_to_be32(tmpsize); 217 error = xfs_bwrite(mp, bp); 218 if (error) { 219 goto error0; 220 } 221 /* 222 * AG inode header block 223 */ 224 bp = xfs_buf_get(mp->m_ddev_targp, 225 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 226 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED); 227 agi = XFS_BUF_TO_AGI(bp); 228 memset(agi, 0, mp->m_sb.sb_sectsize); 229 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 230 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 231 agi->agi_seqno = cpu_to_be32(agno); 232 agi->agi_length = cpu_to_be32(agsize); 233 agi->agi_count = 0; 234 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 235 agi->agi_level = cpu_to_be32(1); 236 agi->agi_freecount = 0; 237 agi->agi_newino = cpu_to_be32(NULLAGINO); 238 agi->agi_dirino = cpu_to_be32(NULLAGINO); 239 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 240 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 241 error = xfs_bwrite(mp, bp); 242 if (error) { 243 goto error0; 244 } 245 /* 246 * BNO btree root block 247 */ 248 bp = xfs_buf_get(mp->m_ddev_targp, 249 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 250 BTOBB(mp->m_sb.sb_blocksize), 251 XBF_LOCK | XBF_MAPPED); 252 block = XFS_BUF_TO_BLOCK(bp); 253 memset(block, 0, mp->m_sb.sb_blocksize); 254 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 255 block->bb_level = 0; 256 block->bb_numrecs = cpu_to_be16(1); 257 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 258 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 259 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 260 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 261 arec->ar_blockcount = cpu_to_be32( 262 agsize - be32_to_cpu(arec->ar_startblock)); 263 error = xfs_bwrite(mp, bp); 264 if (error) { 265 goto error0; 266 } 267 /* 268 * CNT btree root block 269 */ 270 bp = xfs_buf_get(mp->m_ddev_targp, 271 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 272 BTOBB(mp->m_sb.sb_blocksize), 273 XBF_LOCK | XBF_MAPPED); 274 block = XFS_BUF_TO_BLOCK(bp); 275 memset(block, 0, mp->m_sb.sb_blocksize); 276 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 277 block->bb_level = 0; 278 block->bb_numrecs = cpu_to_be16(1); 279 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 280 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 281 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 282 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 283 arec->ar_blockcount = cpu_to_be32( 284 agsize - be32_to_cpu(arec->ar_startblock)); 285 nfree += be32_to_cpu(arec->ar_blockcount); 286 error = xfs_bwrite(mp, bp); 287 if (error) { 288 goto error0; 289 } 290 /* 291 * INO btree root block 292 */ 293 bp = xfs_buf_get(mp->m_ddev_targp, 294 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 295 BTOBB(mp->m_sb.sb_blocksize), 296 XBF_LOCK | XBF_MAPPED); 297 block = XFS_BUF_TO_BLOCK(bp); 298 memset(block, 0, mp->m_sb.sb_blocksize); 299 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 300 block->bb_level = 0; 301 block->bb_numrecs = 0; 302 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 303 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 304 error = xfs_bwrite(mp, bp); 305 if (error) { 306 goto error0; 307 } 308 } 309 xfs_trans_agblocks_delta(tp, nfree); 310 /* 311 * There are new blocks in the old last a.g. 312 */ 313 if (new) { 314 /* 315 * Change the agi length. 316 */ 317 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 318 if (error) { 319 goto error0; 320 } 321 ASSERT(bp); 322 agi = XFS_BUF_TO_AGI(bp); 323 be32_add_cpu(&agi->agi_length, new); 324 ASSERT(nagcount == oagcount || 325 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 326 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 327 /* 328 * Change agf length. 329 */ 330 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 331 if (error) { 332 goto error0; 333 } 334 ASSERT(bp); 335 agf = XFS_BUF_TO_AGF(bp); 336 be32_add_cpu(&agf->agf_length, new); 337 ASSERT(be32_to_cpu(agf->agf_length) == 338 be32_to_cpu(agi->agi_length)); 339 340 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 341 /* 342 * Free the new space. 343 */ 344 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 345 be32_to_cpu(agf->agf_length) - new), new); 346 if (error) { 347 goto error0; 348 } 349 } 350 351 /* 352 * Update changed superblock fields transactionally. These are not 353 * seen by the rest of the world until the transaction commit applies 354 * them atomically to the superblock. 355 */ 356 if (nagcount > oagcount) 357 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 358 if (nb > mp->m_sb.sb_dblocks) 359 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 360 nb - mp->m_sb.sb_dblocks); 361 if (nfree) 362 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 363 if (dpct) 364 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 365 error = xfs_trans_commit(tp, 0); 366 if (error) 367 return error; 368 369 /* New allocation groups fully initialized, so update mount struct */ 370 if (nagimax) 371 mp->m_maxagi = nagimax; 372 if (mp->m_sb.sb_imax_pct) { 373 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 374 do_div(icount, 100); 375 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 376 } else 377 mp->m_maxicount = 0; 378 379 /* update secondary superblocks. */ 380 for (agno = 1; agno < nagcount; agno++) { 381 error = xfs_read_buf(mp, mp->m_ddev_targp, 382 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 383 XFS_FSS_TO_BB(mp, 1), 0, &bp); 384 if (error) { 385 xfs_fs_cmn_err(CE_WARN, mp, 386 "error %d reading secondary superblock for ag %d", 387 error, agno); 388 break; 389 } 390 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 391 /* 392 * If we get an error writing out the alternate superblocks, 393 * just issue a warning and continue. The real work is 394 * already done and committed. 395 */ 396 if (!(error = xfs_bwrite(mp, bp))) { 397 continue; 398 } else { 399 xfs_fs_cmn_err(CE_WARN, mp, 400 "write error %d updating secondary superblock for ag %d", 401 error, agno); 402 break; /* no point in continuing */ 403 } 404 } 405 return 0; 406 407 error0: 408 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 409 return error; 410 } 411 412 static int 413 xfs_growfs_log_private( 414 xfs_mount_t *mp, /* mount point for filesystem */ 415 xfs_growfs_log_t *in) /* growfs log input struct */ 416 { 417 xfs_extlen_t nb; 418 419 nb = in->newblocks; 420 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 421 return XFS_ERROR(EINVAL); 422 if (nb == mp->m_sb.sb_logblocks && 423 in->isint == (mp->m_sb.sb_logstart != 0)) 424 return XFS_ERROR(EINVAL); 425 /* 426 * Moving the log is hard, need new interfaces to sync 427 * the log first, hold off all activity while moving it. 428 * Can have shorter or longer log in the same space, 429 * or transform internal to external log or vice versa. 430 */ 431 return XFS_ERROR(ENOSYS); 432 } 433 434 /* 435 * protected versions of growfs function acquire and release locks on the mount 436 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 437 * XFS_IOC_FSGROWFSRT 438 */ 439 440 441 int 442 xfs_growfs_data( 443 xfs_mount_t *mp, 444 xfs_growfs_data_t *in) 445 { 446 int error; 447 448 if (!capable(CAP_SYS_ADMIN)) 449 return XFS_ERROR(EPERM); 450 if (!mutex_trylock(&mp->m_growlock)) 451 return XFS_ERROR(EWOULDBLOCK); 452 error = xfs_growfs_data_private(mp, in); 453 mutex_unlock(&mp->m_growlock); 454 return error; 455 } 456 457 int 458 xfs_growfs_log( 459 xfs_mount_t *mp, 460 xfs_growfs_log_t *in) 461 { 462 int error; 463 464 if (!capable(CAP_SYS_ADMIN)) 465 return XFS_ERROR(EPERM); 466 if (!mutex_trylock(&mp->m_growlock)) 467 return XFS_ERROR(EWOULDBLOCK); 468 error = xfs_growfs_log_private(mp, in); 469 mutex_unlock(&mp->m_growlock); 470 return error; 471 } 472 473 /* 474 * exported through ioctl XFS_IOC_FSCOUNTS 475 */ 476 477 int 478 xfs_fs_counts( 479 xfs_mount_t *mp, 480 xfs_fsop_counts_t *cnt) 481 { 482 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 483 spin_lock(&mp->m_sb_lock); 484 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 485 cnt->freertx = mp->m_sb.sb_frextents; 486 cnt->freeino = mp->m_sb.sb_ifree; 487 cnt->allocino = mp->m_sb.sb_icount; 488 spin_unlock(&mp->m_sb_lock); 489 return 0; 490 } 491 492 /* 493 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 494 * 495 * xfs_reserve_blocks is called to set m_resblks 496 * in the in-core mount table. The number of unused reserved blocks 497 * is kept in m_resblks_avail. 498 * 499 * Reserve the requested number of blocks if available. Otherwise return 500 * as many as possible to satisfy the request. The actual number 501 * reserved are returned in outval 502 * 503 * A null inval pointer indicates that only the current reserved blocks 504 * available should be returned no settings are changed. 505 */ 506 507 int 508 xfs_reserve_blocks( 509 xfs_mount_t *mp, 510 __uint64_t *inval, 511 xfs_fsop_resblks_t *outval) 512 { 513 __int64_t lcounter, delta, fdblks_delta; 514 __uint64_t request; 515 516 /* If inval is null, report current values and return */ 517 if (inval == (__uint64_t *)NULL) { 518 if (!outval) 519 return EINVAL; 520 outval->resblks = mp->m_resblks; 521 outval->resblks_avail = mp->m_resblks_avail; 522 return 0; 523 } 524 525 request = *inval; 526 527 /* 528 * With per-cpu counters, this becomes an interesting 529 * problem. we needto work out if we are freeing or allocation 530 * blocks first, then we can do the modification as necessary. 531 * 532 * We do this under the m_sb_lock so that if we are near 533 * ENOSPC, we will hold out any changes while we work out 534 * what to do. This means that the amount of free space can 535 * change while we do this, so we need to retry if we end up 536 * trying to reserve more space than is available. 537 * 538 * We also use the xfs_mod_incore_sb() interface so that we 539 * don't have to care about whether per cpu counter are 540 * enabled, disabled or even compiled in.... 541 */ 542 retry: 543 spin_lock(&mp->m_sb_lock); 544 xfs_icsb_sync_counters_locked(mp, 0); 545 546 /* 547 * If our previous reservation was larger than the current value, 548 * then move any unused blocks back to the free pool. 549 */ 550 fdblks_delta = 0; 551 if (mp->m_resblks > request) { 552 lcounter = mp->m_resblks_avail - request; 553 if (lcounter > 0) { /* release unused blocks */ 554 fdblks_delta = lcounter; 555 mp->m_resblks_avail -= lcounter; 556 } 557 mp->m_resblks = request; 558 } else { 559 __int64_t free; 560 561 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 562 if (!free) 563 goto out; /* ENOSPC and fdblks_delta = 0 */ 564 565 delta = request - mp->m_resblks; 566 lcounter = free - delta; 567 if (lcounter < 0) { 568 /* We can't satisfy the request, just get what we can */ 569 mp->m_resblks += free; 570 mp->m_resblks_avail += free; 571 fdblks_delta = -free; 572 } else { 573 fdblks_delta = -delta; 574 mp->m_resblks = request; 575 mp->m_resblks_avail += delta; 576 } 577 } 578 out: 579 if (outval) { 580 outval->resblks = mp->m_resblks; 581 outval->resblks_avail = mp->m_resblks_avail; 582 } 583 spin_unlock(&mp->m_sb_lock); 584 585 if (fdblks_delta) { 586 /* 587 * If we are putting blocks back here, m_resblks_avail is 588 * already at its max so this will put it in the free pool. 589 * 590 * If we need space, we'll either succeed in getting it 591 * from the free block count or we'll get an enospc. If 592 * we get a ENOSPC, it means things changed while we were 593 * calculating fdblks_delta and so we should try again to 594 * see if there is anything left to reserve. 595 * 596 * Don't set the reserved flag here - we don't want to reserve 597 * the extra reserve blocks from the reserve..... 598 */ 599 int error; 600 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 601 if (error == ENOSPC) 602 goto retry; 603 } 604 return 0; 605 } 606 607 int 608 xfs_fs_log_dummy( 609 xfs_mount_t *mp) 610 { 611 xfs_trans_t *tp; 612 xfs_inode_t *ip; 613 int error; 614 615 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 616 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0); 617 if (error) { 618 xfs_trans_cancel(tp, 0); 619 return error; 620 } 621 622 ip = mp->m_rootip; 623 xfs_ilock(ip, XFS_ILOCK_EXCL); 624 625 xfs_trans_ijoin(tp, ip); 626 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 627 xfs_trans_set_sync(tp); 628 error = xfs_trans_commit(tp, 0); 629 630 xfs_iunlock(ip, XFS_ILOCK_EXCL); 631 return error; 632 } 633 634 int 635 xfs_fs_goingdown( 636 xfs_mount_t *mp, 637 __uint32_t inflags) 638 { 639 switch (inflags) { 640 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 641 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 642 643 if (sb && !IS_ERR(sb)) { 644 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 645 thaw_bdev(sb->s_bdev, sb); 646 } 647 648 break; 649 } 650 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 651 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 652 break; 653 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 654 xfs_force_shutdown(mp, 655 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 656 break; 657 default: 658 return XFS_ERROR(EINVAL); 659 } 660 661 return 0; 662 } 663