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), XBF_LOCK | XBF_MAPPED); 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), XBF_LOCK | XBF_MAPPED); 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), 262 XBF_LOCK | XBF_MAPPED); 263 block = XFS_BUF_TO_BLOCK(bp); 264 memset(block, 0, mp->m_sb.sb_blocksize); 265 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 266 block->bb_level = 0; 267 block->bb_numrecs = cpu_to_be16(1); 268 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 269 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 270 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 271 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 272 arec->ar_blockcount = cpu_to_be32( 273 agsize - be32_to_cpu(arec->ar_startblock)); 274 error = xfs_bwrite(mp, bp); 275 if (error) { 276 goto error0; 277 } 278 /* 279 * CNT btree root block 280 */ 281 bp = xfs_buf_get(mp->m_ddev_targp, 282 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 283 BTOBB(mp->m_sb.sb_blocksize), 284 XBF_LOCK | XBF_MAPPED); 285 block = XFS_BUF_TO_BLOCK(bp); 286 memset(block, 0, mp->m_sb.sb_blocksize); 287 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 288 block->bb_level = 0; 289 block->bb_numrecs = cpu_to_be16(1); 290 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 291 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 292 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 293 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 294 arec->ar_blockcount = cpu_to_be32( 295 agsize - be32_to_cpu(arec->ar_startblock)); 296 nfree += be32_to_cpu(arec->ar_blockcount); 297 error = xfs_bwrite(mp, bp); 298 if (error) { 299 goto error0; 300 } 301 /* 302 * INO btree root block 303 */ 304 bp = xfs_buf_get(mp->m_ddev_targp, 305 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 306 BTOBB(mp->m_sb.sb_blocksize), 307 XBF_LOCK | XBF_MAPPED); 308 block = XFS_BUF_TO_BLOCK(bp); 309 memset(block, 0, mp->m_sb.sb_blocksize); 310 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 311 block->bb_level = 0; 312 block->bb_numrecs = 0; 313 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 314 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 315 error = xfs_bwrite(mp, bp); 316 if (error) { 317 goto error0; 318 } 319 } 320 xfs_trans_agblocks_delta(tp, nfree); 321 /* 322 * There are new blocks in the old last a.g. 323 */ 324 if (new) { 325 /* 326 * Change the agi length. 327 */ 328 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 329 if (error) { 330 goto error0; 331 } 332 ASSERT(bp); 333 agi = XFS_BUF_TO_AGI(bp); 334 be32_add_cpu(&agi->agi_length, new); 335 ASSERT(nagcount == oagcount || 336 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 337 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 338 /* 339 * Change agf length. 340 */ 341 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 342 if (error) { 343 goto error0; 344 } 345 ASSERT(bp); 346 agf = XFS_BUF_TO_AGF(bp); 347 be32_add_cpu(&agf->agf_length, new); 348 ASSERT(be32_to_cpu(agf->agf_length) == 349 be32_to_cpu(agi->agi_length)); 350 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 351 /* 352 * Free the new space. 353 */ 354 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 355 be32_to_cpu(agf->agf_length) - new), new); 356 if (error) { 357 goto error0; 358 } 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 for (agno = 1; agno < nagcount; agno++) { 383 error = xfs_read_buf(mp, mp->m_ddev_targp, 384 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 385 XFS_FSS_TO_BB(mp, 1), 0, &bp); 386 if (error) { 387 xfs_fs_cmn_err(CE_WARN, mp, 388 "error %d reading secondary superblock for ag %d", 389 error, agno); 390 break; 391 } 392 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 393 /* 394 * If we get an error writing out the alternate superblocks, 395 * just issue a warning and continue. The real work is 396 * already done and committed. 397 */ 398 if (!(error = xfs_bwrite(mp, bp))) { 399 continue; 400 } else { 401 xfs_fs_cmn_err(CE_WARN, mp, 402 "write error %d updating secondary superblock for ag %d", 403 error, agno); 404 break; /* no point in continuing */ 405 } 406 } 407 return 0; 408 409 error0: 410 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 411 return error; 412 } 413 414 static int 415 xfs_growfs_log_private( 416 xfs_mount_t *mp, /* mount point for filesystem */ 417 xfs_growfs_log_t *in) /* growfs log input struct */ 418 { 419 xfs_extlen_t nb; 420 421 nb = in->newblocks; 422 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 423 return XFS_ERROR(EINVAL); 424 if (nb == mp->m_sb.sb_logblocks && 425 in->isint == (mp->m_sb.sb_logstart != 0)) 426 return XFS_ERROR(EINVAL); 427 /* 428 * Moving the log is hard, need new interfaces to sync 429 * the log first, hold off all activity while moving it. 430 * Can have shorter or longer log in the same space, 431 * or transform internal to external log or vice versa. 432 */ 433 return XFS_ERROR(ENOSYS); 434 } 435 436 /* 437 * protected versions of growfs function acquire and release locks on the mount 438 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 439 * XFS_IOC_FSGROWFSRT 440 */ 441 442 443 int 444 xfs_growfs_data( 445 xfs_mount_t *mp, 446 xfs_growfs_data_t *in) 447 { 448 int error; 449 450 if (!capable(CAP_SYS_ADMIN)) 451 return XFS_ERROR(EPERM); 452 if (!mutex_trylock(&mp->m_growlock)) 453 return XFS_ERROR(EWOULDBLOCK); 454 error = xfs_growfs_data_private(mp, in); 455 mutex_unlock(&mp->m_growlock); 456 return error; 457 } 458 459 int 460 xfs_growfs_log( 461 xfs_mount_t *mp, 462 xfs_growfs_log_t *in) 463 { 464 int error; 465 466 if (!capable(CAP_SYS_ADMIN)) 467 return XFS_ERROR(EPERM); 468 if (!mutex_trylock(&mp->m_growlock)) 469 return XFS_ERROR(EWOULDBLOCK); 470 error = xfs_growfs_log_private(mp, in); 471 mutex_unlock(&mp->m_growlock); 472 return error; 473 } 474 475 /* 476 * exported through ioctl XFS_IOC_FSCOUNTS 477 */ 478 479 int 480 xfs_fs_counts( 481 xfs_mount_t *mp, 482 xfs_fsop_counts_t *cnt) 483 { 484 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 485 spin_lock(&mp->m_sb_lock); 486 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 487 cnt->freertx = mp->m_sb.sb_frextents; 488 cnt->freeino = mp->m_sb.sb_ifree; 489 cnt->allocino = mp->m_sb.sb_icount; 490 spin_unlock(&mp->m_sb_lock); 491 return 0; 492 } 493 494 /* 495 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 496 * 497 * xfs_reserve_blocks is called to set m_resblks 498 * in the in-core mount table. The number of unused reserved blocks 499 * is kept in m_resblks_avail. 500 * 501 * Reserve the requested number of blocks if available. Otherwise return 502 * as many as possible to satisfy the request. The actual number 503 * reserved are returned in outval 504 * 505 * A null inval pointer indicates that only the current reserved blocks 506 * available should be returned no settings are changed. 507 */ 508 509 int 510 xfs_reserve_blocks( 511 xfs_mount_t *mp, 512 __uint64_t *inval, 513 xfs_fsop_resblks_t *outval) 514 { 515 __int64_t lcounter, delta, fdblks_delta; 516 __uint64_t request; 517 518 /* If inval is null, report current values and return */ 519 if (inval == (__uint64_t *)NULL) { 520 if (!outval) 521 return EINVAL; 522 outval->resblks = mp->m_resblks; 523 outval->resblks_avail = mp->m_resblks_avail; 524 return 0; 525 } 526 527 request = *inval; 528 529 /* 530 * With per-cpu counters, this becomes an interesting 531 * problem. we needto work out if we are freeing or allocation 532 * blocks first, then we can do the modification as necessary. 533 * 534 * We do this under the m_sb_lock so that if we are near 535 * ENOSPC, we will hold out any changes while we work out 536 * what to do. This means that the amount of free space can 537 * change while we do this, so we need to retry if we end up 538 * trying to reserve more space than is available. 539 * 540 * We also use the xfs_mod_incore_sb() interface so that we 541 * don't have to care about whether per cpu counter are 542 * enabled, disabled or even compiled in.... 543 */ 544 retry: 545 spin_lock(&mp->m_sb_lock); 546 xfs_icsb_sync_counters_locked(mp, 0); 547 548 /* 549 * If our previous reservation was larger than the current value, 550 * then move any unused blocks back to the free pool. 551 */ 552 fdblks_delta = 0; 553 if (mp->m_resblks > request) { 554 lcounter = mp->m_resblks_avail - request; 555 if (lcounter > 0) { /* release unused blocks */ 556 fdblks_delta = lcounter; 557 mp->m_resblks_avail -= lcounter; 558 } 559 mp->m_resblks = request; 560 } else { 561 __int64_t free; 562 563 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 564 if (!free) 565 goto out; /* ENOSPC and fdblks_delta = 0 */ 566 567 delta = request - mp->m_resblks; 568 lcounter = free - delta; 569 if (lcounter < 0) { 570 /* We can't satisfy the request, just get what we can */ 571 mp->m_resblks += free; 572 mp->m_resblks_avail += free; 573 fdblks_delta = -free; 574 } else { 575 fdblks_delta = -delta; 576 mp->m_resblks = request; 577 mp->m_resblks_avail += delta; 578 } 579 } 580 out: 581 if (outval) { 582 outval->resblks = mp->m_resblks; 583 outval->resblks_avail = mp->m_resblks_avail; 584 } 585 spin_unlock(&mp->m_sb_lock); 586 587 if (fdblks_delta) { 588 /* 589 * If we are putting blocks back here, m_resblks_avail is 590 * already at its max so this will put it in the free pool. 591 * 592 * If we need space, we'll either succeed in getting it 593 * from the free block count or we'll get an enospc. If 594 * we get a ENOSPC, it means things changed while we were 595 * calculating fdblks_delta and so we should try again to 596 * see if there is anything left to reserve. 597 * 598 * Don't set the reserved flag here - we don't want to reserve 599 * the extra reserve blocks from the reserve..... 600 */ 601 int error; 602 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0); 603 if (error == ENOSPC) 604 goto retry; 605 } 606 return 0; 607 } 608 609 int 610 xfs_fs_log_dummy( 611 xfs_mount_t *mp) 612 { 613 xfs_trans_t *tp; 614 xfs_inode_t *ip; 615 int error; 616 617 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 618 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0); 619 if (error) { 620 xfs_trans_cancel(tp, 0); 621 return error; 622 } 623 624 ip = mp->m_rootip; 625 xfs_ilock(ip, XFS_ILOCK_EXCL); 626 627 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 628 xfs_trans_ihold(tp, ip); 629 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 630 xfs_trans_set_sync(tp); 631 error = xfs_trans_commit(tp, 0); 632 633 xfs_iunlock(ip, XFS_ILOCK_EXCL); 634 return error; 635 } 636 637 int 638 xfs_fs_goingdown( 639 xfs_mount_t *mp, 640 __uint32_t inflags) 641 { 642 switch (inflags) { 643 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 644 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 645 646 if (sb && !IS_ERR(sb)) { 647 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 648 thaw_bdev(sb->s_bdev, sb); 649 } 650 651 break; 652 } 653 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 654 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 655 break; 656 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 657 xfs_force_shutdown(mp, 658 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 659 break; 660 default: 661 return XFS_ERROR(EINVAL); 662 } 663 664 return 0; 665 } 666