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 struct xfs_btree_block *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 = (xfs_rfsblock_t)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 void *new_perag, *old_perag; 171 172 xfs_filestream_flush(mp); 173 174 new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount, 175 KM_MAYFAIL); 176 if (!new_perag) 177 return XFS_ERROR(ENOMEM); 178 179 down_write(&mp->m_peraglock); 180 memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount); 181 old_perag = mp->m_perag; 182 mp->m_perag = new_perag; 183 184 mp->m_flags |= XFS_MOUNT_32BITINODES; 185 nagimax = xfs_initialize_perag(mp, nagcount); 186 up_write(&mp->m_peraglock); 187 188 kmem_free(old_perag); 189 } 190 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 191 tp->t_flags |= XFS_TRANS_RESERVE; 192 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 193 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 194 xfs_trans_cancel(tp, 0); 195 return error; 196 } 197 198 nfree = 0; 199 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 200 /* 201 * AG freelist header block 202 */ 203 bp = xfs_buf_get(mp->m_ddev_targp, 204 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 205 XFS_FSS_TO_BB(mp, 1), 0); 206 agf = XFS_BUF_TO_AGF(bp); 207 memset(agf, 0, mp->m_sb.sb_sectsize); 208 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 209 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 210 agf->agf_seqno = cpu_to_be32(agno); 211 if (agno == nagcount - 1) 212 agsize = 213 nb - 214 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 215 else 216 agsize = mp->m_sb.sb_agblocks; 217 agf->agf_length = cpu_to_be32(agsize); 218 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 219 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 220 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 221 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 222 agf->agf_flfirst = 0; 223 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 224 agf->agf_flcount = 0; 225 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 226 agf->agf_freeblks = cpu_to_be32(tmpsize); 227 agf->agf_longest = cpu_to_be32(tmpsize); 228 error = xfs_bwrite(mp, bp); 229 if (error) { 230 goto error0; 231 } 232 /* 233 * AG inode header block 234 */ 235 bp = xfs_buf_get(mp->m_ddev_targp, 236 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 237 XFS_FSS_TO_BB(mp, 1), 0); 238 agi = XFS_BUF_TO_AGI(bp); 239 memset(agi, 0, mp->m_sb.sb_sectsize); 240 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 241 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 242 agi->agi_seqno = cpu_to_be32(agno); 243 agi->agi_length = cpu_to_be32(agsize); 244 agi->agi_count = 0; 245 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 246 agi->agi_level = cpu_to_be32(1); 247 agi->agi_freecount = 0; 248 agi->agi_newino = cpu_to_be32(NULLAGINO); 249 agi->agi_dirino = cpu_to_be32(NULLAGINO); 250 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 251 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 252 error = xfs_bwrite(mp, bp); 253 if (error) { 254 goto error0; 255 } 256 /* 257 * BNO btree root block 258 */ 259 bp = xfs_buf_get(mp->m_ddev_targp, 260 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 261 BTOBB(mp->m_sb.sb_blocksize), 0); 262 block = XFS_BUF_TO_BLOCK(bp); 263 memset(block, 0, mp->m_sb.sb_blocksize); 264 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 265 block->bb_level = 0; 266 block->bb_numrecs = cpu_to_be16(1); 267 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 268 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 269 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 270 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 271 arec->ar_blockcount = cpu_to_be32( 272 agsize - be32_to_cpu(arec->ar_startblock)); 273 error = xfs_bwrite(mp, bp); 274 if (error) { 275 goto error0; 276 } 277 /* 278 * CNT btree root block 279 */ 280 bp = xfs_buf_get(mp->m_ddev_targp, 281 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 282 BTOBB(mp->m_sb.sb_blocksize), 0); 283 block = XFS_BUF_TO_BLOCK(bp); 284 memset(block, 0, mp->m_sb.sb_blocksize); 285 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 286 block->bb_level = 0; 287 block->bb_numrecs = cpu_to_be16(1); 288 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 289 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 290 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 291 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 292 arec->ar_blockcount = cpu_to_be32( 293 agsize - be32_to_cpu(arec->ar_startblock)); 294 nfree += be32_to_cpu(arec->ar_blockcount); 295 error = xfs_bwrite(mp, bp); 296 if (error) { 297 goto error0; 298 } 299 /* 300 * INO btree root block 301 */ 302 bp = xfs_buf_get(mp->m_ddev_targp, 303 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 304 BTOBB(mp->m_sb.sb_blocksize), 0); 305 block = XFS_BUF_TO_BLOCK(bp); 306 memset(block, 0, mp->m_sb.sb_blocksize); 307 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 308 block->bb_level = 0; 309 block->bb_numrecs = 0; 310 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 311 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 312 error = xfs_bwrite(mp, bp); 313 if (error) { 314 goto error0; 315 } 316 } 317 xfs_trans_agblocks_delta(tp, nfree); 318 /* 319 * There are new blocks in the old last a.g. 320 */ 321 if (new) { 322 /* 323 * Change the agi length. 324 */ 325 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 326 if (error) { 327 goto error0; 328 } 329 ASSERT(bp); 330 agi = XFS_BUF_TO_AGI(bp); 331 be32_add_cpu(&agi->agi_length, new); 332 ASSERT(nagcount == oagcount || 333 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 334 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 335 /* 336 * Change agf length. 337 */ 338 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 339 if (error) { 340 goto error0; 341 } 342 ASSERT(bp); 343 agf = XFS_BUF_TO_AGF(bp); 344 be32_add_cpu(&agf->agf_length, new); 345 ASSERT(be32_to_cpu(agf->agf_length) == 346 be32_to_cpu(agi->agi_length)); 347 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 348 /* 349 * Free the new space. 350 */ 351 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 352 be32_to_cpu(agf->agf_length) - new), new); 353 if (error) { 354 goto error0; 355 } 356 } 357 if (nagcount > oagcount) 358 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 359 if (nb > mp->m_sb.sb_dblocks) 360 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 361 nb - mp->m_sb.sb_dblocks); 362 if (nfree) 363 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 364 if (dpct) 365 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 366 error = xfs_trans_commit(tp, 0); 367 if (error) { 368 return error; 369 } 370 /* New allocation groups fully initialized, so update mount struct */ 371 if (nagimax) 372 mp->m_maxagi = nagimax; 373 if (mp->m_sb.sb_imax_pct) { 374 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 375 do_div(icount, 100); 376 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 377 } else 378 mp->m_maxicount = 0; 379 for (agno = 1; agno < nagcount; agno++) { 380 error = xfs_read_buf(mp, mp->m_ddev_targp, 381 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 382 XFS_FSS_TO_BB(mp, 1), 0, &bp); 383 if (error) { 384 xfs_fs_cmn_err(CE_WARN, mp, 385 "error %d reading secondary superblock for ag %d", 386 error, agno); 387 break; 388 } 389 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 390 /* 391 * If we get an error writing out the alternate superblocks, 392 * just issue a warning and continue. The real work is 393 * already done and committed. 394 */ 395 if (!(error = xfs_bwrite(mp, bp))) { 396 continue; 397 } else { 398 xfs_fs_cmn_err(CE_WARN, mp, 399 "write error %d updating secondary superblock for ag %d", 400 error, agno); 401 break; /* no point in continuing */ 402 } 403 } 404 return 0; 405 406 error0: 407 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 408 return error; 409 } 410 411 static int 412 xfs_growfs_log_private( 413 xfs_mount_t *mp, /* mount point for filesystem */ 414 xfs_growfs_log_t *in) /* growfs log input struct */ 415 { 416 xfs_extlen_t nb; 417 418 nb = in->newblocks; 419 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 420 return XFS_ERROR(EINVAL); 421 if (nb == mp->m_sb.sb_logblocks && 422 in->isint == (mp->m_sb.sb_logstart != 0)) 423 return XFS_ERROR(EINVAL); 424 /* 425 * Moving the log is hard, need new interfaces to sync 426 * the log first, hold off all activity while moving it. 427 * Can have shorter or longer log in the same space, 428 * or transform internal to external log or vice versa. 429 */ 430 return XFS_ERROR(ENOSYS); 431 } 432 433 /* 434 * protected versions of growfs function acquire and release locks on the mount 435 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 436 * XFS_IOC_FSGROWFSRT 437 */ 438 439 440 int 441 xfs_growfs_data( 442 xfs_mount_t *mp, 443 xfs_growfs_data_t *in) 444 { 445 int error; 446 447 if (!capable(CAP_SYS_ADMIN)) 448 return XFS_ERROR(EPERM); 449 if (!mutex_trylock(&mp->m_growlock)) 450 return XFS_ERROR(EWOULDBLOCK); 451 error = xfs_growfs_data_private(mp, in); 452 mutex_unlock(&mp->m_growlock); 453 return error; 454 } 455 456 int 457 xfs_growfs_log( 458 xfs_mount_t *mp, 459 xfs_growfs_log_t *in) 460 { 461 int error; 462 463 if (!capable(CAP_SYS_ADMIN)) 464 return XFS_ERROR(EPERM); 465 if (!mutex_trylock(&mp->m_growlock)) 466 return XFS_ERROR(EWOULDBLOCK); 467 error = xfs_growfs_log_private(mp, in); 468 mutex_unlock(&mp->m_growlock); 469 return error; 470 } 471 472 /* 473 * exported through ioctl XFS_IOC_FSCOUNTS 474 */ 475 476 int 477 xfs_fs_counts( 478 xfs_mount_t *mp, 479 xfs_fsop_counts_t *cnt) 480 { 481 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 482 spin_lock(&mp->m_sb_lock); 483 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 484 cnt->freertx = mp->m_sb.sb_frextents; 485 cnt->freeino = mp->m_sb.sb_ifree; 486 cnt->allocino = mp->m_sb.sb_icount; 487 spin_unlock(&mp->m_sb_lock); 488 return 0; 489 } 490 491 /* 492 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 493 * 494 * xfs_reserve_blocks is called to set m_resblks 495 * in the in-core mount table. The number of unused reserved blocks 496 * is kept in m_resblks_avail. 497 * 498 * Reserve the requested number of blocks if available. Otherwise return 499 * as many as possible to satisfy the request. The actual number 500 * reserved are returned in outval 501 * 502 * A null inval pointer indicates that only the current reserved blocks 503 * available should be returned no settings are changed. 504 */ 505 506 int 507 xfs_reserve_blocks( 508 xfs_mount_t *mp, 509 __uint64_t *inval, 510 xfs_fsop_resblks_t *outval) 511 { 512 __int64_t lcounter, delta, fdblks_delta; 513 __uint64_t request; 514 515 /* If inval is null, report current values and return */ 516 if (inval == (__uint64_t *)NULL) { 517 if (!outval) 518 return EINVAL; 519 outval->resblks = mp->m_resblks; 520 outval->resblks_avail = mp->m_resblks_avail; 521 return 0; 522 } 523 524 request = *inval; 525 526 /* 527 * With per-cpu counters, this becomes an interesting 528 * problem. we needto work out if we are freeing or allocation 529 * blocks first, then we can do the modification as necessary. 530 * 531 * We do this under the m_sb_lock so that if we are near 532 * ENOSPC, we will hold out any changes while we work out 533 * what to do. This means that the amount of free space can 534 * change while we do this, so we need to retry if we end up 535 * trying to reserve more space than is available. 536 * 537 * We also use the xfs_mod_incore_sb() interface so that we 538 * don't have to care about whether per cpu counter are 539 * enabled, disabled or even compiled in.... 540 */ 541 retry: 542 spin_lock(&mp->m_sb_lock); 543 xfs_icsb_sync_counters_locked(mp, 0); 544 545 /* 546 * If our previous reservation was larger than the current value, 547 * then move any unused blocks back to the free pool. 548 */ 549 fdblks_delta = 0; 550 if (mp->m_resblks > request) { 551 lcounter = mp->m_resblks_avail - request; 552 if (lcounter > 0) { /* release unused blocks */ 553 fdblks_delta = lcounter; 554 mp->m_resblks_avail -= lcounter; 555 } 556 mp->m_resblks = request; 557 } else { 558 __int64_t free; 559 560 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 561 if (!free) 562 goto out; /* ENOSPC and fdblks_delta = 0 */ 563 564 delta = request - mp->m_resblks; 565 lcounter = free - delta; 566 if (lcounter < 0) { 567 /* We can't satisfy the request, just get what we can */ 568 mp->m_resblks += free; 569 mp->m_resblks_avail += free; 570 fdblks_delta = -free; 571 } else { 572 fdblks_delta = -delta; 573 mp->m_resblks = request; 574 mp->m_resblks_avail += delta; 575 } 576 } 577 out: 578 if (outval) { 579 outval->resblks = mp->m_resblks; 580 outval->resblks_avail = mp->m_resblks_avail; 581 } 582 spin_unlock(&mp->m_sb_lock); 583 584 if (fdblks_delta) { 585 /* 586 * If we are putting blocks back here, m_resblks_avail is 587 * already at its max so this will put it in the free pool. 588 * 589 * If we need space, we'll either succeed in getting it 590 * from the free block count or we'll get an enospc. If 591 * we get a ENOSPC, it means things changed while we were 592 * calculating fdblks_delta and so we should try again to 593 * see if there is anything left to reserve. 594 * 595 * Don't set the reserved flag here - we don't want to reserve 596 * the extra reserve blocks from the reserve..... 597 */ 598 int error; 599 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 600 if (error == ENOSPC) 601 goto retry; 602 } 603 return 0; 604 } 605 606 int 607 xfs_fs_log_dummy( 608 xfs_mount_t *mp) 609 { 610 xfs_trans_t *tp; 611 xfs_inode_t *ip; 612 int error; 613 614 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1); 615 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0); 616 if (error) { 617 xfs_trans_cancel(tp, 0); 618 return error; 619 } 620 621 ip = mp->m_rootip; 622 xfs_ilock(ip, XFS_ILOCK_EXCL); 623 624 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 625 xfs_trans_ihold(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