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_sb_t *sbp; 140 xfs_trans_t *tp; 141 142 nb = in->newblocks; 143 pct = in->imaxpct; 144 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 145 return XFS_ERROR(EINVAL); 146 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 147 return error; 148 dpct = pct - mp->m_sb.sb_imax_pct; 149 error = xfs_read_buf(mp, mp->m_ddev_targp, 150 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 151 XFS_FSS_TO_BB(mp, 1), 0, &bp); 152 if (error) 153 return error; 154 ASSERT(bp); 155 xfs_buf_relse(bp); 156 157 new = nb; /* use new as a temporary here */ 158 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 159 nagcount = new + (nb_mod != 0); 160 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 161 nagcount--; 162 nb = nagcount * mp->m_sb.sb_agblocks; 163 if (nb < mp->m_sb.sb_dblocks) 164 return XFS_ERROR(EINVAL); 165 } 166 new = nb - mp->m_sb.sb_dblocks; 167 oagcount = mp->m_sb.sb_agcount; 168 if (nagcount > oagcount) { 169 xfs_filestream_flush(mp); 170 down_write(&mp->m_peraglock); 171 mp->m_perag = kmem_realloc(mp->m_perag, 172 sizeof(xfs_perag_t) * nagcount, 173 sizeof(xfs_perag_t) * oagcount, 174 KM_SLEEP); 175 memset(&mp->m_perag[oagcount], 0, 176 (nagcount - oagcount) * sizeof(xfs_perag_t)); 177 mp->m_flags |= XFS_MOUNT_32BITINODES; 178 nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount); 179 up_write(&mp->m_peraglock); 180 } 181 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 182 tp->t_flags |= XFS_TRANS_RESERVE; 183 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 184 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 185 xfs_trans_cancel(tp, 0); 186 return error; 187 } 188 189 nfree = 0; 190 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 191 /* 192 * AG freelist header block 193 */ 194 bp = xfs_buf_get(mp->m_ddev_targp, 195 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 196 XFS_FSS_TO_BB(mp, 1), 0); 197 agf = XFS_BUF_TO_AGF(bp); 198 memset(agf, 0, mp->m_sb.sb_sectsize); 199 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 200 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 201 agf->agf_seqno = cpu_to_be32(agno); 202 if (agno == nagcount - 1) 203 agsize = 204 nb - 205 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 206 else 207 agsize = mp->m_sb.sb_agblocks; 208 agf->agf_length = cpu_to_be32(agsize); 209 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 210 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 211 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 212 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 213 agf->agf_flfirst = 0; 214 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 215 agf->agf_flcount = 0; 216 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 217 agf->agf_freeblks = cpu_to_be32(tmpsize); 218 agf->agf_longest = cpu_to_be32(tmpsize); 219 error = xfs_bwrite(mp, bp); 220 if (error) { 221 goto error0; 222 } 223 /* 224 * AG inode header block 225 */ 226 bp = xfs_buf_get(mp->m_ddev_targp, 227 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 228 XFS_FSS_TO_BB(mp, 1), 0); 229 agi = XFS_BUF_TO_AGI(bp); 230 memset(agi, 0, mp->m_sb.sb_sectsize); 231 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 232 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 233 agi->agi_seqno = cpu_to_be32(agno); 234 agi->agi_length = cpu_to_be32(agsize); 235 agi->agi_count = 0; 236 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 237 agi->agi_level = cpu_to_be32(1); 238 agi->agi_freecount = 0; 239 agi->agi_newino = cpu_to_be32(NULLAGINO); 240 agi->agi_dirino = cpu_to_be32(NULLAGINO); 241 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 242 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 243 error = xfs_bwrite(mp, bp); 244 if (error) { 245 goto error0; 246 } 247 /* 248 * BNO btree root block 249 */ 250 bp = xfs_buf_get(mp->m_ddev_targp, 251 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 252 BTOBB(mp->m_sb.sb_blocksize), 0); 253 block = XFS_BUF_TO_SBLOCK(bp); 254 memset(block, 0, mp->m_sb.sb_blocksize); 255 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 256 block->bb_level = 0; 257 block->bb_numrecs = cpu_to_be16(1); 258 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK); 259 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 260 arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1); 261 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 262 arec->ar_blockcount = cpu_to_be32( 263 agsize - be32_to_cpu(arec->ar_startblock)); 264 error = xfs_bwrite(mp, bp); 265 if (error) { 266 goto error0; 267 } 268 /* 269 * CNT btree root block 270 */ 271 bp = xfs_buf_get(mp->m_ddev_targp, 272 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 273 BTOBB(mp->m_sb.sb_blocksize), 0); 274 block = XFS_BUF_TO_SBLOCK(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_leftsib = cpu_to_be32(NULLAGBLOCK); 280 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 281 arec = XFS_BTREE_REC_ADDR(xfs_alloc, 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), 0); 296 block = XFS_BUF_TO_SBLOCK(bp); 297 memset(block, 0, mp->m_sb.sb_blocksize); 298 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 299 block->bb_level = 0; 300 block->bb_numrecs = 0; 301 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK); 302 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK); 303 error = xfs_bwrite(mp, bp); 304 if (error) { 305 goto error0; 306 } 307 } 308 xfs_trans_agblocks_delta(tp, nfree); 309 /* 310 * There are new blocks in the old last a.g. 311 */ 312 if (new) { 313 /* 314 * Change the agi length. 315 */ 316 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 317 if (error) { 318 goto error0; 319 } 320 ASSERT(bp); 321 agi = XFS_BUF_TO_AGI(bp); 322 be32_add(&agi->agi_length, new); 323 ASSERT(nagcount == oagcount || 324 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 325 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 326 /* 327 * Change agf length. 328 */ 329 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 330 if (error) { 331 goto error0; 332 } 333 ASSERT(bp); 334 agf = XFS_BUF_TO_AGF(bp); 335 be32_add(&agf->agf_length, new); 336 ASSERT(be32_to_cpu(agf->agf_length) == 337 be32_to_cpu(agi->agi_length)); 338 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 339 /* 340 * Free the new space. 341 */ 342 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 343 be32_to_cpu(agf->agf_length) - new), new); 344 if (error) { 345 goto error0; 346 } 347 } 348 if (nagcount > oagcount) 349 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 350 if (nb > mp->m_sb.sb_dblocks) 351 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 352 nb - mp->m_sb.sb_dblocks); 353 if (nfree) 354 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 355 if (dpct) 356 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 357 error = xfs_trans_commit(tp, 0); 358 if (error) { 359 return error; 360 } 361 /* New allocation groups fully initialized, so update mount struct */ 362 if (nagimax) 363 mp->m_maxagi = nagimax; 364 if (mp->m_sb.sb_imax_pct) { 365 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 366 do_div(icount, 100); 367 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 368 } else 369 mp->m_maxicount = 0; 370 for (agno = 1; agno < nagcount; agno++) { 371 error = xfs_read_buf(mp, mp->m_ddev_targp, 372 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 373 XFS_FSS_TO_BB(mp, 1), 0, &bp); 374 if (error) { 375 xfs_fs_cmn_err(CE_WARN, mp, 376 "error %d reading secondary superblock for ag %d", 377 error, agno); 378 break; 379 } 380 sbp = XFS_BUF_TO_SBP(bp); 381 xfs_xlatesb(sbp, &mp->m_sb, -1, 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 (!cpsema(&mp->m_growlock)) 439 return XFS_ERROR(EWOULDBLOCK); 440 error = xfs_growfs_data_private(mp, in); 441 vsema(&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 (!cpsema(&mp->m_growlock)) 452 return XFS_ERROR(EWOULDBLOCK); 453 error = xfs_growfs_log_private(mp, in); 454 vsema(&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 unsigned long s; 468 469 xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT); 470 s = XFS_SB_LOCK(mp); 471 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 472 cnt->freertx = mp->m_sb.sb_frextents; 473 cnt->freeino = mp->m_sb.sb_ifree; 474 cnt->allocino = mp->m_sb.sb_icount; 475 XFS_SB_UNLOCK(mp, s); 476 return 0; 477 } 478 479 /* 480 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 481 * 482 * xfs_reserve_blocks is called to set m_resblks 483 * in the in-core mount table. The number of unused reserved blocks 484 * is kept in m_resblks_avail. 485 * 486 * Reserve the requested number of blocks if available. Otherwise return 487 * as many as possible to satisfy the request. The actual number 488 * reserved are returned in outval 489 * 490 * A null inval pointer indicates that only the current reserved blocks 491 * available should be returned no settings are changed. 492 */ 493 494 int 495 xfs_reserve_blocks( 496 xfs_mount_t *mp, 497 __uint64_t *inval, 498 xfs_fsop_resblks_t *outval) 499 { 500 __int64_t lcounter, delta, fdblks_delta; 501 __uint64_t request; 502 unsigned long s; 503 504 /* If inval is null, report current values and return */ 505 if (inval == (__uint64_t *)NULL) { 506 if (!outval) 507 return EINVAL; 508 outval->resblks = mp->m_resblks; 509 outval->resblks_avail = mp->m_resblks_avail; 510 return 0; 511 } 512 513 request = *inval; 514 515 /* 516 * With per-cpu counters, this becomes an interesting 517 * problem. we needto work out if we are freeing or allocation 518 * blocks first, then we can do the modification as necessary. 519 * 520 * We do this under the XFS_SB_LOCK so that if we are near 521 * ENOSPC, we will hold out any changes while we work out 522 * what to do. This means that the amount of free space can 523 * change while we do this, so we need to retry if we end up 524 * trying to reserve more space than is available. 525 * 526 * We also use the xfs_mod_incore_sb() interface so that we 527 * don't have to care about whether per cpu counter are 528 * enabled, disabled or even compiled in.... 529 */ 530 retry: 531 s = XFS_SB_LOCK(mp); 532 xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED); 533 534 /* 535 * If our previous reservation was larger than the current value, 536 * then move any unused blocks back to the free pool. 537 */ 538 fdblks_delta = 0; 539 if (mp->m_resblks > request) { 540 lcounter = mp->m_resblks_avail - request; 541 if (lcounter > 0) { /* release unused blocks */ 542 fdblks_delta = lcounter; 543 mp->m_resblks_avail -= lcounter; 544 } 545 mp->m_resblks = request; 546 } else { 547 __int64_t free; 548 549 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 550 if (!free) 551 goto out; /* ENOSPC and fdblks_delta = 0 */ 552 553 delta = request - mp->m_resblks; 554 lcounter = free - delta; 555 if (lcounter < 0) { 556 /* We can't satisfy the request, just get what we can */ 557 mp->m_resblks += free; 558 mp->m_resblks_avail += free; 559 fdblks_delta = -free; 560 mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp); 561 } else { 562 fdblks_delta = -delta; 563 mp->m_sb.sb_fdblocks = 564 lcounter + XFS_ALLOC_SET_ASIDE(mp); 565 mp->m_resblks = request; 566 mp->m_resblks_avail += delta; 567 } 568 } 569 out: 570 if (outval) { 571 outval->resblks = mp->m_resblks; 572 outval->resblks_avail = mp->m_resblks_avail; 573 } 574 XFS_SB_UNLOCK(mp, s); 575 576 if (fdblks_delta) { 577 /* 578 * If we are putting blocks back here, m_resblks_avail is 579 * already at it's max so this will put it in the free pool. 580 * 581 * If we need space, we'll either succeed in getting it 582 * from the free block count or we'll get an enospc. If 583 * we get a ENOSPC, it means things changed while we were 584 * calculating fdblks_delta and so we should try again to 585 * see if there is anything left to reserve. 586 * 587 * Don't set the reserved flag here - we don't want to reserve 588 * the extra reserve blocks from the reserve..... 589 */ 590 int error; 591 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 592 if (error == ENOSPC) 593 goto retry; 594 } 595 596 return 0; 597 } 598 599 void 600 xfs_fs_log_dummy( 601 xfs_mount_t *mp) 602 { 603 xfs_trans_t *tp; 604 xfs_inode_t *ip; 605 606 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1); 607 if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) { 608 xfs_trans_cancel(tp, 0); 609 return; 610 } 611 612 ip = mp->m_rootip; 613 xfs_ilock(ip, XFS_ILOCK_EXCL); 614 615 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 616 xfs_trans_ihold(tp, ip); 617 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 618 xfs_trans_set_sync(tp); 619 xfs_trans_commit(tp, 0); 620 621 xfs_iunlock(ip, XFS_ILOCK_EXCL); 622 } 623 624 int 625 xfs_fs_goingdown( 626 xfs_mount_t *mp, 627 __uint32_t inflags) 628 { 629 switch (inflags) { 630 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 631 struct bhv_vfs *vfsp = XFS_MTOVFS(mp); 632 struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev); 633 634 if (sb && !IS_ERR(sb)) { 635 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 636 thaw_bdev(sb->s_bdev, sb); 637 } 638 639 break; 640 } 641 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 642 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 643 break; 644 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 645 xfs_force_shutdown(mp, 646 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 647 break; 648 default: 649 return XFS_ERROR(EINVAL); 650 } 651 652 return 0; 653 } 654