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_haslazysbcount(&mp->m_sb) ? 99 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 100 (xfs_sb_version_hasattr2(&mp->m_sb) ? 101 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0); 102 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 103 mp->m_sb.sb_logsectsize : BBSIZE; 104 geo->rtsectsize = mp->m_sb.sb_blocksize; 105 geo->dirblocksize = mp->m_dirblksize; 106 } 107 if (new_version >= 4) { 108 geo->flags |= 109 (xfs_sb_version_haslogv2(&mp->m_sb) ? 110 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 111 geo->logsunit = mp->m_sb.sb_logsunit; 112 } 113 return 0; 114 } 115 116 static int 117 xfs_growfs_data_private( 118 xfs_mount_t *mp, /* mount point for filesystem */ 119 xfs_growfs_data_t *in) /* growfs data input struct */ 120 { 121 xfs_agf_t *agf; 122 xfs_agi_t *agi; 123 xfs_agnumber_t agno; 124 xfs_extlen_t agsize; 125 xfs_extlen_t tmpsize; 126 xfs_alloc_rec_t *arec; 127 xfs_btree_sblock_t *block; 128 xfs_buf_t *bp; 129 int bucket; 130 int dpct; 131 int error; 132 xfs_agnumber_t nagcount; 133 xfs_agnumber_t nagimax = 0; 134 xfs_rfsblock_t nb, nb_mod; 135 xfs_rfsblock_t new; 136 xfs_rfsblock_t nfree; 137 xfs_agnumber_t oagcount; 138 int pct; 139 xfs_trans_t *tp; 140 141 nb = in->newblocks; 142 pct = in->imaxpct; 143 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 144 return XFS_ERROR(EINVAL); 145 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 146 return error; 147 dpct = pct - mp->m_sb.sb_imax_pct; 148 error = xfs_read_buf(mp, mp->m_ddev_targp, 149 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 150 XFS_FSS_TO_BB(mp, 1), 0, &bp); 151 if (error) 152 return error; 153 ASSERT(bp); 154 xfs_buf_relse(bp); 155 156 new = nb; /* use new as a temporary here */ 157 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 158 nagcount = new + (nb_mod != 0); 159 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 160 nagcount--; 161 nb = nagcount * mp->m_sb.sb_agblocks; 162 if (nb < mp->m_sb.sb_dblocks) 163 return XFS_ERROR(EINVAL); 164 } 165 new = nb - mp->m_sb.sb_dblocks; 166 oagcount = mp->m_sb.sb_agcount; 167 if (nagcount > oagcount) { 168 xfs_filestream_flush(mp); 169 down_write(&mp->m_peraglock); 170 mp->m_perag = kmem_realloc(mp->m_perag, 171 sizeof(xfs_perag_t) * nagcount, 172 sizeof(xfs_perag_t) * oagcount, 173 KM_SLEEP); 174 memset(&mp->m_perag[oagcount], 0, 175 (nagcount - oagcount) * sizeof(xfs_perag_t)); 176 mp->m_flags |= XFS_MOUNT_32BITINODES; 177 nagimax = xfs_initialize_perag(mp, nagcount); 178 up_write(&mp->m_peraglock); 179 } 180 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 181 tp->t_flags |= XFS_TRANS_RESERVE; 182 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 183 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 184 xfs_trans_cancel(tp, 0); 185 return error; 186 } 187 188 nfree = 0; 189 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 190 /* 191 * AG freelist header block 192 */ 193 bp = xfs_buf_get(mp->m_ddev_targp, 194 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 195 XFS_FSS_TO_BB(mp, 1), 0); 196 agf = XFS_BUF_TO_AGF(bp); 197 memset(agf, 0, mp->m_sb.sb_sectsize); 198 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 199 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 200 agf->agf_seqno = cpu_to_be32(agno); 201 if (agno == nagcount - 1) 202 agsize = 203 nb - 204 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 205 else 206 agsize = mp->m_sb.sb_agblocks; 207 agf->agf_length = cpu_to_be32(agsize); 208 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 209 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 210 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 211 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 212 agf->agf_flfirst = 0; 213 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 214 agf->agf_flcount = 0; 215 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 216 agf->agf_freeblks = cpu_to_be32(tmpsize); 217 agf->agf_longest = cpu_to_be32(tmpsize); 218 error = xfs_bwrite(mp, bp); 219 if (error) { 220 goto error0; 221 } 222 /* 223 * AG inode header block 224 */ 225 bp = xfs_buf_get(mp->m_ddev_targp, 226 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 227 XFS_FSS_TO_BB(mp, 1), 0); 228 agi = XFS_BUF_TO_AGI(bp); 229 memset(agi, 0, mp->m_sb.sb_sectsize); 230 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 231 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 232 agi->agi_seqno = cpu_to_be32(agno); 233 agi->agi_length = cpu_to_be32(agsize); 234 agi->agi_count = 0; 235 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 236 agi->agi_level = cpu_to_be32(1); 237 agi->agi_freecount = 0; 238 agi->agi_newino = cpu_to_be32(NULLAGINO); 239 agi->agi_dirino = cpu_to_be32(NULLAGINO); 240 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 241 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 242 error = xfs_bwrite(mp, bp); 243 if (error) { 244 goto error0; 245 } 246 /* 247 * BNO btree root block 248 */ 249 bp = xfs_buf_get(mp->m_ddev_targp, 250 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 251 BTOBB(mp->m_sb.sb_blocksize), 0); 252 block = XFS_BUF_TO_SBLOCK(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_leftsib = cpu_to_be32(NULLAGBLOCK); 258 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 259 arec = XFS_BTREE_REC_ADDR(xfs_alloc, 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), 0); 273 block = XFS_BUF_TO_SBLOCK(bp); 274 memset(block, 0, mp->m_sb.sb_blocksize); 275 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 276 block->bb_level = 0; 277 block->bb_numrecs = cpu_to_be16(1); 278 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK); 279 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 280 arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1); 281 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 282 arec->ar_blockcount = cpu_to_be32( 283 agsize - be32_to_cpu(arec->ar_startblock)); 284 nfree += be32_to_cpu(arec->ar_blockcount); 285 error = xfs_bwrite(mp, bp); 286 if (error) { 287 goto error0; 288 } 289 /* 290 * INO btree root block 291 */ 292 bp = xfs_buf_get(mp->m_ddev_targp, 293 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 294 BTOBB(mp->m_sb.sb_blocksize), 0); 295 block = XFS_BUF_TO_SBLOCK(bp); 296 memset(block, 0, mp->m_sb.sb_blocksize); 297 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 298 block->bb_level = 0; 299 block->bb_numrecs = 0; 300 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK); 301 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 302 error = xfs_bwrite(mp, bp); 303 if (error) { 304 goto error0; 305 } 306 } 307 xfs_trans_agblocks_delta(tp, nfree); 308 /* 309 * There are new blocks in the old last a.g. 310 */ 311 if (new) { 312 /* 313 * Change the agi length. 314 */ 315 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 316 if (error) { 317 goto error0; 318 } 319 ASSERT(bp); 320 agi = XFS_BUF_TO_AGI(bp); 321 be32_add_cpu(&agi->agi_length, new); 322 ASSERT(nagcount == oagcount || 323 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 324 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 325 /* 326 * Change agf length. 327 */ 328 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 329 if (error) { 330 goto error0; 331 } 332 ASSERT(bp); 333 agf = XFS_BUF_TO_AGF(bp); 334 be32_add_cpu(&agf->agf_length, new); 335 ASSERT(be32_to_cpu(agf->agf_length) == 336 be32_to_cpu(agi->agi_length)); 337 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 338 /* 339 * Free the new space. 340 */ 341 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 342 be32_to_cpu(agf->agf_length) - new), new); 343 if (error) { 344 goto error0; 345 } 346 } 347 if (nagcount > oagcount) 348 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 349 if (nb > mp->m_sb.sb_dblocks) 350 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 351 nb - mp->m_sb.sb_dblocks); 352 if (nfree) 353 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 354 if (dpct) 355 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 356 error = xfs_trans_commit(tp, 0); 357 if (error) { 358 return error; 359 } 360 /* New allocation groups fully initialized, so update mount struct */ 361 if (nagimax) 362 mp->m_maxagi = nagimax; 363 if (mp->m_sb.sb_imax_pct) { 364 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 365 do_div(icount, 100); 366 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 367 } else 368 mp->m_maxicount = 0; 369 for (agno = 1; agno < nagcount; agno++) { 370 error = xfs_read_buf(mp, mp->m_ddev_targp, 371 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 372 XFS_FSS_TO_BB(mp, 1), 0, &bp); 373 if (error) { 374 xfs_fs_cmn_err(CE_WARN, mp, 375 "error %d reading secondary superblock for ag %d", 376 error, agno); 377 break; 378 } 379 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 380 /* 381 * If we get an error writing out the alternate superblocks, 382 * just issue a warning and continue. The real work is 383 * already done and committed. 384 */ 385 if (!(error = xfs_bwrite(mp, bp))) { 386 continue; 387 } else { 388 xfs_fs_cmn_err(CE_WARN, mp, 389 "write error %d updating secondary superblock for ag %d", 390 error, agno); 391 break; /* no point in continuing */ 392 } 393 } 394 return 0; 395 396 error0: 397 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 398 return error; 399 } 400 401 static int 402 xfs_growfs_log_private( 403 xfs_mount_t *mp, /* mount point for filesystem */ 404 xfs_growfs_log_t *in) /* growfs log input struct */ 405 { 406 xfs_extlen_t nb; 407 408 nb = in->newblocks; 409 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 410 return XFS_ERROR(EINVAL); 411 if (nb == mp->m_sb.sb_logblocks && 412 in->isint == (mp->m_sb.sb_logstart != 0)) 413 return XFS_ERROR(EINVAL); 414 /* 415 * Moving the log is hard, need new interfaces to sync 416 * the log first, hold off all activity while moving it. 417 * Can have shorter or longer log in the same space, 418 * or transform internal to external log or vice versa. 419 */ 420 return XFS_ERROR(ENOSYS); 421 } 422 423 /* 424 * protected versions of growfs function acquire and release locks on the mount 425 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 426 * XFS_IOC_FSGROWFSRT 427 */ 428 429 430 int 431 xfs_growfs_data( 432 xfs_mount_t *mp, 433 xfs_growfs_data_t *in) 434 { 435 int error; 436 if (!mutex_trylock(&mp->m_growlock)) 437 return XFS_ERROR(EWOULDBLOCK); 438 error = xfs_growfs_data_private(mp, in); 439 mutex_unlock(&mp->m_growlock); 440 return error; 441 } 442 443 int 444 xfs_growfs_log( 445 xfs_mount_t *mp, 446 xfs_growfs_log_t *in) 447 { 448 int error; 449 if (!mutex_trylock(&mp->m_growlock)) 450 return XFS_ERROR(EWOULDBLOCK); 451 error = xfs_growfs_log_private(mp, in); 452 mutex_unlock(&mp->m_growlock); 453 return error; 454 } 455 456 /* 457 * exported through ioctl XFS_IOC_FSCOUNTS 458 */ 459 460 int 461 xfs_fs_counts( 462 xfs_mount_t *mp, 463 xfs_fsop_counts_t *cnt) 464 { 465 xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT); 466 spin_lock(&mp->m_sb_lock); 467 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 468 cnt->freertx = mp->m_sb.sb_frextents; 469 cnt->freeino = mp->m_sb.sb_ifree; 470 cnt->allocino = mp->m_sb.sb_icount; 471 spin_unlock(&mp->m_sb_lock); 472 return 0; 473 } 474 475 /* 476 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 477 * 478 * xfs_reserve_blocks is called to set m_resblks 479 * in the in-core mount table. The number of unused reserved blocks 480 * is kept in m_resblks_avail. 481 * 482 * Reserve the requested number of blocks if available. Otherwise return 483 * as many as possible to satisfy the request. The actual number 484 * reserved are returned in outval 485 * 486 * A null inval pointer indicates that only the current reserved blocks 487 * available should be returned no settings are changed. 488 */ 489 490 int 491 xfs_reserve_blocks( 492 xfs_mount_t *mp, 493 __uint64_t *inval, 494 xfs_fsop_resblks_t *outval) 495 { 496 __int64_t lcounter, delta, fdblks_delta; 497 __uint64_t request; 498 499 /* If inval is null, report current values and return */ 500 if (inval == (__uint64_t *)NULL) { 501 if (!outval) 502 return EINVAL; 503 outval->resblks = mp->m_resblks; 504 outval->resblks_avail = mp->m_resblks_avail; 505 return 0; 506 } 507 508 request = *inval; 509 510 /* 511 * With per-cpu counters, this becomes an interesting 512 * problem. we needto work out if we are freeing or allocation 513 * blocks first, then we can do the modification as necessary. 514 * 515 * We do this under the m_sb_lock so that if we are near 516 * ENOSPC, we will hold out any changes while we work out 517 * what to do. This means that the amount of free space can 518 * change while we do this, so we need to retry if we end up 519 * trying to reserve more space than is available. 520 * 521 * We also use the xfs_mod_incore_sb() interface so that we 522 * don't have to care about whether per cpu counter are 523 * enabled, disabled or even compiled in.... 524 */ 525 retry: 526 spin_lock(&mp->m_sb_lock); 527 xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED); 528 529 /* 530 * If our previous reservation was larger than the current value, 531 * then move any unused blocks back to the free pool. 532 */ 533 fdblks_delta = 0; 534 if (mp->m_resblks > request) { 535 lcounter = mp->m_resblks_avail - request; 536 if (lcounter > 0) { /* release unused blocks */ 537 fdblks_delta = lcounter; 538 mp->m_resblks_avail -= lcounter; 539 } 540 mp->m_resblks = request; 541 } else { 542 __int64_t free; 543 544 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 545 if (!free) 546 goto out; /* ENOSPC and fdblks_delta = 0 */ 547 548 delta = request - mp->m_resblks; 549 lcounter = free - delta; 550 if (lcounter < 0) { 551 /* We can't satisfy the request, just get what we can */ 552 mp->m_resblks += free; 553 mp->m_resblks_avail += free; 554 fdblks_delta = -free; 555 mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp); 556 } else { 557 fdblks_delta = -delta; 558 mp->m_sb.sb_fdblocks = 559 lcounter + XFS_ALLOC_SET_ASIDE(mp); 560 mp->m_resblks = request; 561 mp->m_resblks_avail += delta; 562 } 563 } 564 out: 565 if (outval) { 566 outval->resblks = mp->m_resblks; 567 outval->resblks_avail = mp->m_resblks_avail; 568 } 569 spin_unlock(&mp->m_sb_lock); 570 571 if (fdblks_delta) { 572 /* 573 * If we are putting blocks back here, m_resblks_avail is 574 * already at it's max so this will put it in the free pool. 575 * 576 * If we need space, we'll either succeed in getting it 577 * from the free block count or we'll get an enospc. If 578 * we get a ENOSPC, it means things changed while we were 579 * calculating fdblks_delta and so we should try again to 580 * see if there is anything left to reserve. 581 * 582 * Don't set the reserved flag here - we don't want to reserve 583 * the extra reserve blocks from the reserve..... 584 */ 585 int error; 586 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 587 if (error == ENOSPC) 588 goto retry; 589 } 590 591 return 0; 592 } 593 594 void 595 xfs_fs_log_dummy( 596 xfs_mount_t *mp) 597 { 598 xfs_trans_t *tp; 599 xfs_inode_t *ip; 600 601 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1); 602 if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) { 603 xfs_trans_cancel(tp, 0); 604 return; 605 } 606 607 ip = mp->m_rootip; 608 xfs_ilock(ip, XFS_ILOCK_EXCL); 609 610 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 611 xfs_trans_ihold(tp, ip); 612 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 613 xfs_trans_set_sync(tp); 614 xfs_trans_commit(tp, 0); 615 616 xfs_iunlock(ip, XFS_ILOCK_EXCL); 617 } 618 619 int 620 xfs_fs_goingdown( 621 xfs_mount_t *mp, 622 __uint32_t inflags) 623 { 624 switch (inflags) { 625 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 626 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 627 628 if (sb && !IS_ERR(sb)) { 629 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 630 thaw_bdev(sb->s_bdev, sb); 631 } 632 633 break; 634 } 635 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 636 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 637 break; 638 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 639 xfs_force_shutdown(mp, 640 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 641 break; 642 default: 643 return XFS_ERROR(EINVAL); 644 } 645 646 return 0; 647 } 648