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 #include "xfs_trace.h" 49 50 /* 51 * File system operations 52 */ 53 54 int 55 xfs_fs_geometry( 56 xfs_mount_t *mp, 57 xfs_fsop_geom_t *geo, 58 int new_version) 59 { 60 geo->blocksize = mp->m_sb.sb_blocksize; 61 geo->rtextsize = mp->m_sb.sb_rextsize; 62 geo->agblocks = mp->m_sb.sb_agblocks; 63 geo->agcount = mp->m_sb.sb_agcount; 64 geo->logblocks = mp->m_sb.sb_logblocks; 65 geo->sectsize = mp->m_sb.sb_sectsize; 66 geo->inodesize = mp->m_sb.sb_inodesize; 67 geo->imaxpct = mp->m_sb.sb_imax_pct; 68 geo->datablocks = mp->m_sb.sb_dblocks; 69 geo->rtblocks = mp->m_sb.sb_rblocks; 70 geo->rtextents = mp->m_sb.sb_rextents; 71 geo->logstart = mp->m_sb.sb_logstart; 72 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 73 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 74 if (new_version >= 2) { 75 geo->sunit = mp->m_sb.sb_unit; 76 geo->swidth = mp->m_sb.sb_width; 77 } 78 if (new_version >= 3) { 79 geo->version = XFS_FSOP_GEOM_VERSION; 80 geo->flags = 81 (xfs_sb_version_hasattr(&mp->m_sb) ? 82 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 83 (xfs_sb_version_hasnlink(&mp->m_sb) ? 84 XFS_FSOP_GEOM_FLAGS_NLINK : 0) | 85 (xfs_sb_version_hasquota(&mp->m_sb) ? 86 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 87 (xfs_sb_version_hasalign(&mp->m_sb) ? 88 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 89 (xfs_sb_version_hasdalign(&mp->m_sb) ? 90 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 91 (xfs_sb_version_hasshared(&mp->m_sb) ? 92 XFS_FSOP_GEOM_FLAGS_SHARED : 0) | 93 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 94 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 95 (xfs_sb_version_hasdirv2(&mp->m_sb) ? 96 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) | 97 (xfs_sb_version_hassector(&mp->m_sb) ? 98 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 99 (xfs_sb_version_hasasciici(&mp->m_sb) ? 100 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 101 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 102 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 103 (xfs_sb_version_hasattr2(&mp->m_sb) ? 104 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0); 105 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 106 mp->m_sb.sb_logsectsize : BBSIZE; 107 geo->rtsectsize = mp->m_sb.sb_blocksize; 108 geo->dirblocksize = mp->m_dirblksize; 109 } 110 if (new_version >= 4) { 111 geo->flags |= 112 (xfs_sb_version_haslogv2(&mp->m_sb) ? 113 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 114 geo->logsunit = mp->m_sb.sb_logsunit; 115 } 116 return 0; 117 } 118 119 static int 120 xfs_growfs_data_private( 121 xfs_mount_t *mp, /* mount point for filesystem */ 122 xfs_growfs_data_t *in) /* growfs data input struct */ 123 { 124 xfs_agf_t *agf; 125 xfs_agi_t *agi; 126 xfs_agnumber_t agno; 127 xfs_extlen_t agsize; 128 xfs_extlen_t tmpsize; 129 xfs_alloc_rec_t *arec; 130 struct xfs_btree_block *block; 131 xfs_buf_t *bp; 132 int bucket; 133 int dpct; 134 int error; 135 xfs_agnumber_t nagcount; 136 xfs_agnumber_t nagimax = 0; 137 xfs_rfsblock_t nb, nb_mod; 138 xfs_rfsblock_t new; 139 xfs_rfsblock_t nfree; 140 xfs_agnumber_t oagcount; 141 int pct; 142 xfs_trans_t *tp; 143 144 nb = in->newblocks; 145 pct = in->imaxpct; 146 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 147 return XFS_ERROR(EINVAL); 148 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 149 return error; 150 dpct = pct - mp->m_sb.sb_imax_pct; 151 error = xfs_read_buf(mp, mp->m_ddev_targp, 152 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 153 XFS_FSS_TO_BB(mp, 1), 0, &bp); 154 if (error) 155 return error; 156 ASSERT(bp); 157 xfs_buf_relse(bp); 158 159 new = nb; /* use new as a temporary here */ 160 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 161 nagcount = new + (nb_mod != 0); 162 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 163 nagcount--; 164 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 165 if (nb < mp->m_sb.sb_dblocks) 166 return XFS_ERROR(EINVAL); 167 } 168 new = nb - mp->m_sb.sb_dblocks; 169 oagcount = mp->m_sb.sb_agcount; 170 171 /* allocate the new per-ag structures */ 172 if (nagcount > oagcount) { 173 error = xfs_initialize_perag(mp, nagcount, &nagimax); 174 if (error) 175 return error; 176 } 177 178 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 179 tp->t_flags |= XFS_TRANS_RESERVE; 180 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 181 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 182 xfs_trans_cancel(tp, 0); 183 return error; 184 } 185 186 /* 187 * Write new AG headers to disk. Non-transactional, but written 188 * synchronously so they are completed prior to the growfs transaction 189 * being logged. 190 */ 191 nfree = 0; 192 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 193 /* 194 * AG freelist header block 195 */ 196 bp = xfs_buf_get(mp->m_ddev_targp, 197 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 198 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED); 199 agf = XFS_BUF_TO_AGF(bp); 200 memset(agf, 0, mp->m_sb.sb_sectsize); 201 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 202 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 203 agf->agf_seqno = cpu_to_be32(agno); 204 if (agno == nagcount - 1) 205 agsize = 206 nb - 207 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 208 else 209 agsize = mp->m_sb.sb_agblocks; 210 agf->agf_length = cpu_to_be32(agsize); 211 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 212 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 213 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 214 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 215 agf->agf_flfirst = 0; 216 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 217 agf->agf_flcount = 0; 218 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 219 agf->agf_freeblks = cpu_to_be32(tmpsize); 220 agf->agf_longest = cpu_to_be32(tmpsize); 221 error = xfs_bwrite(mp, bp); 222 if (error) { 223 goto error0; 224 } 225 /* 226 * AG inode header block 227 */ 228 bp = xfs_buf_get(mp->m_ddev_targp, 229 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 230 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED); 231 agi = XFS_BUF_TO_AGI(bp); 232 memset(agi, 0, mp->m_sb.sb_sectsize); 233 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 234 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 235 agi->agi_seqno = cpu_to_be32(agno); 236 agi->agi_length = cpu_to_be32(agsize); 237 agi->agi_count = 0; 238 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 239 agi->agi_level = cpu_to_be32(1); 240 agi->agi_freecount = 0; 241 agi->agi_newino = cpu_to_be32(NULLAGINO); 242 agi->agi_dirino = cpu_to_be32(NULLAGINO); 243 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 244 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 245 error = xfs_bwrite(mp, bp); 246 if (error) { 247 goto error0; 248 } 249 /* 250 * BNO btree root block 251 */ 252 bp = xfs_buf_get(mp->m_ddev_targp, 253 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 254 BTOBB(mp->m_sb.sb_blocksize), 255 XBF_LOCK | XBF_MAPPED); 256 block = XFS_BUF_TO_BLOCK(bp); 257 memset(block, 0, mp->m_sb.sb_blocksize); 258 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 259 block->bb_level = 0; 260 block->bb_numrecs = cpu_to_be16(1); 261 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 262 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 263 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 264 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 265 arec->ar_blockcount = cpu_to_be32( 266 agsize - be32_to_cpu(arec->ar_startblock)); 267 error = xfs_bwrite(mp, bp); 268 if (error) { 269 goto error0; 270 } 271 /* 272 * CNT btree root block 273 */ 274 bp = xfs_buf_get(mp->m_ddev_targp, 275 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 276 BTOBB(mp->m_sb.sb_blocksize), 277 XBF_LOCK | XBF_MAPPED); 278 block = XFS_BUF_TO_BLOCK(bp); 279 memset(block, 0, mp->m_sb.sb_blocksize); 280 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 281 block->bb_level = 0; 282 block->bb_numrecs = cpu_to_be16(1); 283 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 284 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 285 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 286 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 287 arec->ar_blockcount = cpu_to_be32( 288 agsize - be32_to_cpu(arec->ar_startblock)); 289 nfree += be32_to_cpu(arec->ar_blockcount); 290 error = xfs_bwrite(mp, bp); 291 if (error) { 292 goto error0; 293 } 294 /* 295 * INO btree root block 296 */ 297 bp = xfs_buf_get(mp->m_ddev_targp, 298 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 299 BTOBB(mp->m_sb.sb_blocksize), 300 XBF_LOCK | XBF_MAPPED); 301 block = XFS_BUF_TO_BLOCK(bp); 302 memset(block, 0, mp->m_sb.sb_blocksize); 303 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 304 block->bb_level = 0; 305 block->bb_numrecs = 0; 306 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 307 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 308 error = xfs_bwrite(mp, bp); 309 if (error) { 310 goto error0; 311 } 312 } 313 xfs_trans_agblocks_delta(tp, nfree); 314 /* 315 * There are new blocks in the old last a.g. 316 */ 317 if (new) { 318 /* 319 * Change the agi length. 320 */ 321 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 322 if (error) { 323 goto error0; 324 } 325 ASSERT(bp); 326 agi = XFS_BUF_TO_AGI(bp); 327 be32_add_cpu(&agi->agi_length, new); 328 ASSERT(nagcount == oagcount || 329 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 330 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 331 /* 332 * Change agf length. 333 */ 334 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 335 if (error) { 336 goto error0; 337 } 338 ASSERT(bp); 339 agf = XFS_BUF_TO_AGF(bp); 340 be32_add_cpu(&agf->agf_length, new); 341 ASSERT(be32_to_cpu(agf->agf_length) == 342 be32_to_cpu(agi->agi_length)); 343 344 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 345 /* 346 * Free the new space. 347 */ 348 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 349 be32_to_cpu(agf->agf_length) - new), new); 350 if (error) { 351 goto error0; 352 } 353 } 354 355 /* 356 * Update changed superblock fields transactionally. These are not 357 * seen by the rest of the world until the transaction commit applies 358 * them atomically to the superblock. 359 */ 360 if (nagcount > oagcount) 361 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 362 if (nb > mp->m_sb.sb_dblocks) 363 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 364 nb - mp->m_sb.sb_dblocks); 365 if (nfree) 366 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 367 if (dpct) 368 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 369 error = xfs_trans_commit(tp, 0); 370 if (error) 371 return error; 372 373 /* New allocation groups fully initialized, so update mount struct */ 374 if (nagimax) 375 mp->m_maxagi = nagimax; 376 if (mp->m_sb.sb_imax_pct) { 377 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 378 do_div(icount, 100); 379 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 380 } else 381 mp->m_maxicount = 0; 382 383 /* update secondary superblocks. */ 384 for (agno = 1; agno < nagcount; agno++) { 385 error = xfs_read_buf(mp, mp->m_ddev_targp, 386 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 387 XFS_FSS_TO_BB(mp, 1), 0, &bp); 388 if (error) { 389 xfs_fs_cmn_err(CE_WARN, mp, 390 "error %d reading secondary superblock for ag %d", 391 error, agno); 392 break; 393 } 394 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 395 /* 396 * If we get an error writing out the alternate superblocks, 397 * just issue a warning and continue. The real work is 398 * already done and committed. 399 */ 400 if (!(error = xfs_bwrite(mp, bp))) { 401 continue; 402 } else { 403 xfs_fs_cmn_err(CE_WARN, mp, 404 "write error %d updating secondary superblock for ag %d", 405 error, agno); 406 break; /* no point in continuing */ 407 } 408 } 409 return 0; 410 411 error0: 412 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 413 return error; 414 } 415 416 static int 417 xfs_growfs_log_private( 418 xfs_mount_t *mp, /* mount point for filesystem */ 419 xfs_growfs_log_t *in) /* growfs log input struct */ 420 { 421 xfs_extlen_t nb; 422 423 nb = in->newblocks; 424 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 425 return XFS_ERROR(EINVAL); 426 if (nb == mp->m_sb.sb_logblocks && 427 in->isint == (mp->m_sb.sb_logstart != 0)) 428 return XFS_ERROR(EINVAL); 429 /* 430 * Moving the log is hard, need new interfaces to sync 431 * the log first, hold off all activity while moving it. 432 * Can have shorter or longer log in the same space, 433 * or transform internal to external log or vice versa. 434 */ 435 return XFS_ERROR(ENOSYS); 436 } 437 438 /* 439 * protected versions of growfs function acquire and release locks on the mount 440 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 441 * XFS_IOC_FSGROWFSRT 442 */ 443 444 445 int 446 xfs_growfs_data( 447 xfs_mount_t *mp, 448 xfs_growfs_data_t *in) 449 { 450 int error; 451 452 if (!capable(CAP_SYS_ADMIN)) 453 return XFS_ERROR(EPERM); 454 if (!mutex_trylock(&mp->m_growlock)) 455 return XFS_ERROR(EWOULDBLOCK); 456 error = xfs_growfs_data_private(mp, in); 457 mutex_unlock(&mp->m_growlock); 458 return error; 459 } 460 461 int 462 xfs_growfs_log( 463 xfs_mount_t *mp, 464 xfs_growfs_log_t *in) 465 { 466 int error; 467 468 if (!capable(CAP_SYS_ADMIN)) 469 return XFS_ERROR(EPERM); 470 if (!mutex_trylock(&mp->m_growlock)) 471 return XFS_ERROR(EWOULDBLOCK); 472 error = xfs_growfs_log_private(mp, in); 473 mutex_unlock(&mp->m_growlock); 474 return error; 475 } 476 477 /* 478 * exported through ioctl XFS_IOC_FSCOUNTS 479 */ 480 481 int 482 xfs_fs_counts( 483 xfs_mount_t *mp, 484 xfs_fsop_counts_t *cnt) 485 { 486 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 487 spin_lock(&mp->m_sb_lock); 488 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 489 cnt->freertx = mp->m_sb.sb_frextents; 490 cnt->freeino = mp->m_sb.sb_ifree; 491 cnt->allocino = mp->m_sb.sb_icount; 492 spin_unlock(&mp->m_sb_lock); 493 return 0; 494 } 495 496 /* 497 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 498 * 499 * xfs_reserve_blocks is called to set m_resblks 500 * in the in-core mount table. The number of unused reserved blocks 501 * is kept in m_resblks_avail. 502 * 503 * Reserve the requested number of blocks if available. Otherwise return 504 * as many as possible to satisfy the request. The actual number 505 * reserved are returned in outval 506 * 507 * A null inval pointer indicates that only the current reserved blocks 508 * available should be returned no settings are changed. 509 */ 510 511 int 512 xfs_reserve_blocks( 513 xfs_mount_t *mp, 514 __uint64_t *inval, 515 xfs_fsop_resblks_t *outval) 516 { 517 __int64_t lcounter, delta, fdblks_delta; 518 __uint64_t request; 519 520 /* If inval is null, report current values and return */ 521 if (inval == (__uint64_t *)NULL) { 522 if (!outval) 523 return EINVAL; 524 outval->resblks = mp->m_resblks; 525 outval->resblks_avail = mp->m_resblks_avail; 526 return 0; 527 } 528 529 request = *inval; 530 531 /* 532 * With per-cpu counters, this becomes an interesting 533 * problem. we needto work out if we are freeing or allocation 534 * blocks first, then we can do the modification as necessary. 535 * 536 * We do this under the m_sb_lock so that if we are near 537 * ENOSPC, we will hold out any changes while we work out 538 * what to do. This means that the amount of free space can 539 * change while we do this, so we need to retry if we end up 540 * trying to reserve more space than is available. 541 * 542 * We also use the xfs_mod_incore_sb() interface so that we 543 * don't have to care about whether per cpu counter are 544 * enabled, disabled or even compiled in.... 545 */ 546 retry: 547 spin_lock(&mp->m_sb_lock); 548 xfs_icsb_sync_counters_locked(mp, 0); 549 550 /* 551 * If our previous reservation was larger than the current value, 552 * then move any unused blocks back to the free pool. 553 */ 554 fdblks_delta = 0; 555 if (mp->m_resblks > request) { 556 lcounter = mp->m_resblks_avail - request; 557 if (lcounter > 0) { /* release unused blocks */ 558 fdblks_delta = lcounter; 559 mp->m_resblks_avail -= lcounter; 560 } 561 mp->m_resblks = request; 562 } else { 563 __int64_t free; 564 565 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 566 if (!free) 567 goto out; /* ENOSPC and fdblks_delta = 0 */ 568 569 delta = request - mp->m_resblks; 570 lcounter = free - delta; 571 if (lcounter < 0) { 572 /* We can't satisfy the request, just get what we can */ 573 mp->m_resblks += free; 574 mp->m_resblks_avail += free; 575 fdblks_delta = -free; 576 } else { 577 fdblks_delta = -delta; 578 mp->m_resblks = request; 579 mp->m_resblks_avail += delta; 580 } 581 } 582 out: 583 if (outval) { 584 outval->resblks = mp->m_resblks; 585 outval->resblks_avail = mp->m_resblks_avail; 586 } 587 spin_unlock(&mp->m_sb_lock); 588 589 if (fdblks_delta) { 590 /* 591 * If we are putting blocks back here, m_resblks_avail is 592 * already at its max so this will put it in the free pool. 593 * 594 * If we need space, we'll either succeed in getting it 595 * from the free block count or we'll get an enospc. If 596 * we get a ENOSPC, it means things changed while we were 597 * calculating fdblks_delta and so we should try again to 598 * see if there is anything left to reserve. 599 * 600 * Don't set the reserved flag here - we don't want to reserve 601 * the extra reserve blocks from the reserve..... 602 */ 603 int error; 604 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 605 if (error == ENOSPC) 606 goto retry; 607 } 608 return 0; 609 } 610 611 int 612 xfs_fs_log_dummy( 613 xfs_mount_t *mp) 614 { 615 xfs_trans_t *tp; 616 xfs_inode_t *ip; 617 int error; 618 619 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 620 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0); 621 if (error) { 622 xfs_trans_cancel(tp, 0); 623 return error; 624 } 625 626 ip = mp->m_rootip; 627 xfs_ilock(ip, XFS_ILOCK_EXCL); 628 629 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 630 xfs_trans_ihold(tp, ip); 631 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 632 xfs_trans_set_sync(tp); 633 error = xfs_trans_commit(tp, 0); 634 635 xfs_iunlock(ip, XFS_ILOCK_EXCL); 636 return error; 637 } 638 639 int 640 xfs_fs_goingdown( 641 xfs_mount_t *mp, 642 __uint32_t inflags) 643 { 644 switch (inflags) { 645 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 646 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 647 648 if (sb && !IS_ERR(sb)) { 649 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 650 thaw_bdev(sb->s_bdev, sb); 651 } 652 653 break; 654 } 655 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 656 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 657 break; 658 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 659 xfs_force_shutdown(mp, 660 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 661 break; 662 default: 663 return XFS_ERROR(EINVAL); 664 } 665 666 return 0; 667 } 668