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_dir2.h" 28 #include "xfs_dmapi.h" 29 #include "xfs_mount.h" 30 #include "xfs_bmap_btree.h" 31 #include "xfs_alloc_btree.h" 32 #include "xfs_ialloc_btree.h" 33 #include "xfs_dir2_sf.h" 34 #include "xfs_attr_sf.h" 35 #include "xfs_dinode.h" 36 #include "xfs_inode.h" 37 #include "xfs_inode_item.h" 38 #include "xfs_btree.h" 39 #include "xfs_error.h" 40 #include "xfs_alloc.h" 41 #include "xfs_ialloc.h" 42 #include "xfs_fsops.h" 43 #include "xfs_itable.h" 44 #include "xfs_trans_space.h" 45 #include "xfs_rtalloc.h" 46 #include "xfs_rw.h" 47 #include "xfs_filestream.h" 48 49 /* 50 * File system operations 51 */ 52 53 int 54 xfs_fs_geometry( 55 xfs_mount_t *mp, 56 xfs_fsop_geom_t *geo, 57 int new_version) 58 { 59 geo->blocksize = mp->m_sb.sb_blocksize; 60 geo->rtextsize = mp->m_sb.sb_rextsize; 61 geo->agblocks = mp->m_sb.sb_agblocks; 62 geo->agcount = mp->m_sb.sb_agcount; 63 geo->logblocks = mp->m_sb.sb_logblocks; 64 geo->sectsize = mp->m_sb.sb_sectsize; 65 geo->inodesize = mp->m_sb.sb_inodesize; 66 geo->imaxpct = mp->m_sb.sb_imax_pct; 67 geo->datablocks = mp->m_sb.sb_dblocks; 68 geo->rtblocks = mp->m_sb.sb_rblocks; 69 geo->rtextents = mp->m_sb.sb_rextents; 70 geo->logstart = mp->m_sb.sb_logstart; 71 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 72 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 73 if (new_version >= 2) { 74 geo->sunit = mp->m_sb.sb_unit; 75 geo->swidth = mp->m_sb.sb_width; 76 } 77 if (new_version >= 3) { 78 geo->version = XFS_FSOP_GEOM_VERSION; 79 geo->flags = 80 (xfs_sb_version_hasattr(&mp->m_sb) ? 81 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 82 (xfs_sb_version_hasnlink(&mp->m_sb) ? 83 XFS_FSOP_GEOM_FLAGS_NLINK : 0) | 84 (xfs_sb_version_hasquota(&mp->m_sb) ? 85 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 86 (xfs_sb_version_hasalign(&mp->m_sb) ? 87 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 88 (xfs_sb_version_hasdalign(&mp->m_sb) ? 89 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 90 (xfs_sb_version_hasshared(&mp->m_sb) ? 91 XFS_FSOP_GEOM_FLAGS_SHARED : 0) | 92 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 93 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 94 (xfs_sb_version_hasdirv2(&mp->m_sb) ? 95 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) | 96 (xfs_sb_version_hassector(&mp->m_sb) ? 97 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 98 (xfs_sb_version_hasasciici(&mp->m_sb) ? 99 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 100 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 101 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 102 (xfs_sb_version_hasattr2(&mp->m_sb) ? 103 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0); 104 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 105 mp->m_sb.sb_logsectsize : BBSIZE; 106 geo->rtsectsize = mp->m_sb.sb_blocksize; 107 geo->dirblocksize = mp->m_dirblksize; 108 } 109 if (new_version >= 4) { 110 geo->flags |= 111 (xfs_sb_version_haslogv2(&mp->m_sb) ? 112 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 113 geo->logsunit = mp->m_sb.sb_logsunit; 114 } 115 return 0; 116 } 117 118 static int 119 xfs_growfs_data_private( 120 xfs_mount_t *mp, /* mount point for filesystem */ 121 xfs_growfs_data_t *in) /* growfs data input struct */ 122 { 123 xfs_agf_t *agf; 124 xfs_agi_t *agi; 125 xfs_agnumber_t agno; 126 xfs_extlen_t agsize; 127 xfs_extlen_t tmpsize; 128 xfs_alloc_rec_t *arec; 129 xfs_btree_sblock_t *block; 130 xfs_buf_t *bp; 131 int bucket; 132 int dpct; 133 int error; 134 xfs_agnumber_t nagcount; 135 xfs_agnumber_t nagimax = 0; 136 xfs_rfsblock_t nb, nb_mod; 137 xfs_rfsblock_t new; 138 xfs_rfsblock_t nfree; 139 xfs_agnumber_t oagcount; 140 int pct; 141 xfs_trans_t *tp; 142 143 nb = in->newblocks; 144 pct = in->imaxpct; 145 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 146 return XFS_ERROR(EINVAL); 147 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 148 return error; 149 dpct = pct - mp->m_sb.sb_imax_pct; 150 error = xfs_read_buf(mp, mp->m_ddev_targp, 151 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 152 XFS_FSS_TO_BB(mp, 1), 0, &bp); 153 if (error) 154 return error; 155 ASSERT(bp); 156 xfs_buf_relse(bp); 157 158 new = nb; /* use new as a temporary here */ 159 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 160 nagcount = new + (nb_mod != 0); 161 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 162 nagcount--; 163 nb = nagcount * mp->m_sb.sb_agblocks; 164 if (nb < mp->m_sb.sb_dblocks) 165 return XFS_ERROR(EINVAL); 166 } 167 new = nb - mp->m_sb.sb_dblocks; 168 oagcount = mp->m_sb.sb_agcount; 169 if (nagcount > oagcount) { 170 xfs_filestream_flush(mp); 171 down_write(&mp->m_peraglock); 172 mp->m_perag = kmem_realloc(mp->m_perag, 173 sizeof(xfs_perag_t) * nagcount, 174 sizeof(xfs_perag_t) * oagcount, 175 KM_SLEEP); 176 memset(&mp->m_perag[oagcount], 0, 177 (nagcount - oagcount) * sizeof(xfs_perag_t)); 178 mp->m_flags |= XFS_MOUNT_32BITINODES; 179 nagimax = xfs_initialize_perag(mp, nagcount); 180 up_write(&mp->m_peraglock); 181 } 182 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 183 tp->t_flags |= XFS_TRANS_RESERVE; 184 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 185 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 186 xfs_trans_cancel(tp, 0); 187 return error; 188 } 189 190 nfree = 0; 191 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 192 /* 193 * AG freelist header block 194 */ 195 bp = xfs_buf_get(mp->m_ddev_targp, 196 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 197 XFS_FSS_TO_BB(mp, 1), 0); 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(mp, bp); 221 if (error) { 222 goto error0; 223 } 224 /* 225 * AG inode header block 226 */ 227 bp = xfs_buf_get(mp->m_ddev_targp, 228 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 229 XFS_FSS_TO_BB(mp, 1), 0); 230 agi = XFS_BUF_TO_AGI(bp); 231 memset(agi, 0, mp->m_sb.sb_sectsize); 232 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 233 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 234 agi->agi_seqno = cpu_to_be32(agno); 235 agi->agi_length = cpu_to_be32(agsize); 236 agi->agi_count = 0; 237 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 238 agi->agi_level = cpu_to_be32(1); 239 agi->agi_freecount = 0; 240 agi->agi_newino = cpu_to_be32(NULLAGINO); 241 agi->agi_dirino = cpu_to_be32(NULLAGINO); 242 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 243 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 244 error = xfs_bwrite(mp, bp); 245 if (error) { 246 goto error0; 247 } 248 /* 249 * BNO btree root block 250 */ 251 bp = xfs_buf_get(mp->m_ddev_targp, 252 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 253 BTOBB(mp->m_sb.sb_blocksize), 0); 254 block = XFS_BUF_TO_SBLOCK(bp); 255 memset(block, 0, mp->m_sb.sb_blocksize); 256 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 257 block->bb_level = 0; 258 block->bb_numrecs = cpu_to_be16(1); 259 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK); 260 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 261 arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1); 262 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 263 arec->ar_blockcount = cpu_to_be32( 264 agsize - be32_to_cpu(arec->ar_startblock)); 265 error = xfs_bwrite(mp, bp); 266 if (error) { 267 goto error0; 268 } 269 /* 270 * CNT btree root block 271 */ 272 bp = xfs_buf_get(mp->m_ddev_targp, 273 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 274 BTOBB(mp->m_sb.sb_blocksize), 0); 275 block = XFS_BUF_TO_SBLOCK(bp); 276 memset(block, 0, mp->m_sb.sb_blocksize); 277 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 278 block->bb_level = 0; 279 block->bb_numrecs = cpu_to_be16(1); 280 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK); 281 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 282 arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1); 283 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 284 arec->ar_blockcount = cpu_to_be32( 285 agsize - be32_to_cpu(arec->ar_startblock)); 286 nfree += be32_to_cpu(arec->ar_blockcount); 287 error = xfs_bwrite(mp, bp); 288 if (error) { 289 goto error0; 290 } 291 /* 292 * INO btree root block 293 */ 294 bp = xfs_buf_get(mp->m_ddev_targp, 295 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 296 BTOBB(mp->m_sb.sb_blocksize), 0); 297 block = XFS_BUF_TO_SBLOCK(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_leftsib = cpu_to_be32(NULLAGBLOCK); 303 block->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 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 340 /* 341 * Free the new space. 342 */ 343 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 344 be32_to_cpu(agf->agf_length) - new), new); 345 if (error) { 346 goto error0; 347 } 348 } 349 if (nagcount > oagcount) 350 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 351 if (nb > mp->m_sb.sb_dblocks) 352 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 353 nb - mp->m_sb.sb_dblocks); 354 if (nfree) 355 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 356 if (dpct) 357 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 358 error = xfs_trans_commit(tp, 0); 359 if (error) { 360 return error; 361 } 362 /* New allocation groups fully initialized, so update mount struct */ 363 if (nagimax) 364 mp->m_maxagi = nagimax; 365 if (mp->m_sb.sb_imax_pct) { 366 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 367 do_div(icount, 100); 368 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 369 } else 370 mp->m_maxicount = 0; 371 for (agno = 1; agno < nagcount; agno++) { 372 error = xfs_read_buf(mp, mp->m_ddev_targp, 373 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 374 XFS_FSS_TO_BB(mp, 1), 0, &bp); 375 if (error) { 376 xfs_fs_cmn_err(CE_WARN, mp, 377 "error %d reading secondary superblock for ag %d", 378 error, agno); 379 break; 380 } 381 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 382 /* 383 * If we get an error writing out the alternate superblocks, 384 * just issue a warning and continue. The real work is 385 * already done and committed. 386 */ 387 if (!(error = xfs_bwrite(mp, bp))) { 388 continue; 389 } else { 390 xfs_fs_cmn_err(CE_WARN, mp, 391 "write error %d updating secondary superblock for ag %d", 392 error, agno); 393 break; /* no point in continuing */ 394 } 395 } 396 return 0; 397 398 error0: 399 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 400 return error; 401 } 402 403 static int 404 xfs_growfs_log_private( 405 xfs_mount_t *mp, /* mount point for filesystem */ 406 xfs_growfs_log_t *in) /* growfs log input struct */ 407 { 408 xfs_extlen_t nb; 409 410 nb = in->newblocks; 411 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 412 return XFS_ERROR(EINVAL); 413 if (nb == mp->m_sb.sb_logblocks && 414 in->isint == (mp->m_sb.sb_logstart != 0)) 415 return XFS_ERROR(EINVAL); 416 /* 417 * Moving the log is hard, need new interfaces to sync 418 * the log first, hold off all activity while moving it. 419 * Can have shorter or longer log in the same space, 420 * or transform internal to external log or vice versa. 421 */ 422 return XFS_ERROR(ENOSYS); 423 } 424 425 /* 426 * protected versions of growfs function acquire and release locks on the mount 427 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 428 * XFS_IOC_FSGROWFSRT 429 */ 430 431 432 int 433 xfs_growfs_data( 434 xfs_mount_t *mp, 435 xfs_growfs_data_t *in) 436 { 437 int error; 438 if (!mutex_trylock(&mp->m_growlock)) 439 return XFS_ERROR(EWOULDBLOCK); 440 error = xfs_growfs_data_private(mp, in); 441 mutex_unlock(&mp->m_growlock); 442 return error; 443 } 444 445 int 446 xfs_growfs_log( 447 xfs_mount_t *mp, 448 xfs_growfs_log_t *in) 449 { 450 int error; 451 if (!mutex_trylock(&mp->m_growlock)) 452 return XFS_ERROR(EWOULDBLOCK); 453 error = xfs_growfs_log_private(mp, in); 454 mutex_unlock(&mp->m_growlock); 455 return error; 456 } 457 458 /* 459 * exported through ioctl XFS_IOC_FSCOUNTS 460 */ 461 462 int 463 xfs_fs_counts( 464 xfs_mount_t *mp, 465 xfs_fsop_counts_t *cnt) 466 { 467 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 468 spin_lock(&mp->m_sb_lock); 469 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 470 cnt->freertx = mp->m_sb.sb_frextents; 471 cnt->freeino = mp->m_sb.sb_ifree; 472 cnt->allocino = mp->m_sb.sb_icount; 473 spin_unlock(&mp->m_sb_lock); 474 return 0; 475 } 476 477 /* 478 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 479 * 480 * xfs_reserve_blocks is called to set m_resblks 481 * in the in-core mount table. The number of unused reserved blocks 482 * is kept in m_resblks_avail. 483 * 484 * Reserve the requested number of blocks if available. Otherwise return 485 * as many as possible to satisfy the request. The actual number 486 * reserved are returned in outval 487 * 488 * A null inval pointer indicates that only the current reserved blocks 489 * available should be returned no settings are changed. 490 */ 491 492 int 493 xfs_reserve_blocks( 494 xfs_mount_t *mp, 495 __uint64_t *inval, 496 xfs_fsop_resblks_t *outval) 497 { 498 __int64_t lcounter, delta, fdblks_delta; 499 __uint64_t request; 500 501 /* If inval is null, report current values and return */ 502 if (inval == (__uint64_t *)NULL) { 503 if (!outval) 504 return EINVAL; 505 outval->resblks = mp->m_resblks; 506 outval->resblks_avail = mp->m_resblks_avail; 507 return 0; 508 } 509 510 request = *inval; 511 512 /* 513 * With per-cpu counters, this becomes an interesting 514 * problem. we needto work out if we are freeing or allocation 515 * blocks first, then we can do the modification as necessary. 516 * 517 * We do this under the m_sb_lock so that if we are near 518 * ENOSPC, we will hold out any changes while we work out 519 * what to do. This means that the amount of free space can 520 * change while we do this, so we need to retry if we end up 521 * trying to reserve more space than is available. 522 * 523 * We also use the xfs_mod_incore_sb() interface so that we 524 * don't have to care about whether per cpu counter are 525 * enabled, disabled or even compiled in.... 526 */ 527 retry: 528 spin_lock(&mp->m_sb_lock); 529 xfs_icsb_sync_counters_locked(mp, 0); 530 531 /* 532 * If our previous reservation was larger than the current value, 533 * then move any unused blocks back to the free pool. 534 */ 535 fdblks_delta = 0; 536 if (mp->m_resblks > request) { 537 lcounter = mp->m_resblks_avail - request; 538 if (lcounter > 0) { /* release unused blocks */ 539 fdblks_delta = lcounter; 540 mp->m_resblks_avail -= lcounter; 541 } 542 mp->m_resblks = request; 543 } else { 544 __int64_t free; 545 546 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 547 if (!free) 548 goto out; /* ENOSPC and fdblks_delta = 0 */ 549 550 delta = request - mp->m_resblks; 551 lcounter = free - delta; 552 if (lcounter < 0) { 553 /* We can't satisfy the request, just get what we can */ 554 mp->m_resblks += free; 555 mp->m_resblks_avail += free; 556 fdblks_delta = -free; 557 } else { 558 fdblks_delta = -delta; 559 mp->m_resblks = request; 560 mp->m_resblks_avail += delta; 561 } 562 } 563 out: 564 if (outval) { 565 outval->resblks = mp->m_resblks; 566 outval->resblks_avail = mp->m_resblks_avail; 567 } 568 spin_unlock(&mp->m_sb_lock); 569 570 if (fdblks_delta) { 571 /* 572 * If we are putting blocks back here, m_resblks_avail is 573 * already at it's max so this will put it in the free pool. 574 * 575 * If we need space, we'll either succeed in getting it 576 * from the free block count or we'll get an enospc. If 577 * we get a ENOSPC, it means things changed while we were 578 * calculating fdblks_delta and so we should try again to 579 * see if there is anything left to reserve. 580 * 581 * Don't set the reserved flag here - we don't want to reserve 582 * the extra reserve blocks from the reserve..... 583 */ 584 int error; 585 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 586 if (error == ENOSPC) 587 goto retry; 588 } 589 return 0; 590 } 591 592 void 593 xfs_fs_log_dummy( 594 xfs_mount_t *mp) 595 { 596 xfs_trans_t *tp; 597 xfs_inode_t *ip; 598 599 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1); 600 if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) { 601 xfs_trans_cancel(tp, 0); 602 return; 603 } 604 605 ip = mp->m_rootip; 606 xfs_ilock(ip, XFS_ILOCK_EXCL); 607 608 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 609 xfs_trans_ihold(tp, ip); 610 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 611 xfs_trans_set_sync(tp); 612 xfs_trans_commit(tp, 0); 613 614 xfs_iunlock(ip, XFS_ILOCK_EXCL); 615 } 616 617 int 618 xfs_fs_goingdown( 619 xfs_mount_t *mp, 620 __uint32_t inflags) 621 { 622 switch (inflags) { 623 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 624 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 625 626 if (sb && !IS_ERR(sb)) { 627 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 628 thaw_bdev(sb->s_bdev, sb); 629 } 630 631 break; 632 } 633 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 634 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 635 break; 636 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 637 xfs_force_shutdown(mp, 638 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 639 break; 640 default: 641 return XFS_ERROR(EINVAL); 642 } 643 644 return 0; 645 } 646