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 if (nagcount > oagcount) { 171 void *new_perag, *old_perag; 172 173 xfs_filestream_flush(mp); 174 175 new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount, 176 KM_MAYFAIL); 177 if (!new_perag) 178 return XFS_ERROR(ENOMEM); 179 180 down_write(&mp->m_peraglock); 181 memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount); 182 old_perag = mp->m_perag; 183 mp->m_perag = new_perag; 184 185 mp->m_flags |= XFS_MOUNT_32BITINODES; 186 nagimax = xfs_initialize_perag(mp, nagcount); 187 up_write(&mp->m_peraglock); 188 189 kmem_free(old_perag); 190 } 191 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 192 tp->t_flags |= XFS_TRANS_RESERVE; 193 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp), 194 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) { 195 xfs_trans_cancel(tp, 0); 196 return error; 197 } 198 199 nfree = 0; 200 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 201 /* 202 * AG freelist header block 203 */ 204 bp = xfs_buf_get(mp->m_ddev_targp, 205 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 206 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED); 207 agf = XFS_BUF_TO_AGF(bp); 208 memset(agf, 0, mp->m_sb.sb_sectsize); 209 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 210 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 211 agf->agf_seqno = cpu_to_be32(agno); 212 if (agno == nagcount - 1) 213 agsize = 214 nb - 215 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 216 else 217 agsize = mp->m_sb.sb_agblocks; 218 agf->agf_length = cpu_to_be32(agsize); 219 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 220 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 221 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 222 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 223 agf->agf_flfirst = 0; 224 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 225 agf->agf_flcount = 0; 226 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 227 agf->agf_freeblks = cpu_to_be32(tmpsize); 228 agf->agf_longest = cpu_to_be32(tmpsize); 229 error = xfs_bwrite(mp, bp); 230 if (error) { 231 goto error0; 232 } 233 /* 234 * AG inode header block 235 */ 236 bp = xfs_buf_get(mp->m_ddev_targp, 237 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 238 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED); 239 agi = XFS_BUF_TO_AGI(bp); 240 memset(agi, 0, mp->m_sb.sb_sectsize); 241 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 242 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 243 agi->agi_seqno = cpu_to_be32(agno); 244 agi->agi_length = cpu_to_be32(agsize); 245 agi->agi_count = 0; 246 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 247 agi->agi_level = cpu_to_be32(1); 248 agi->agi_freecount = 0; 249 agi->agi_newino = cpu_to_be32(NULLAGINO); 250 agi->agi_dirino = cpu_to_be32(NULLAGINO); 251 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 252 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 253 error = xfs_bwrite(mp, bp); 254 if (error) { 255 goto error0; 256 } 257 /* 258 * BNO btree root block 259 */ 260 bp = xfs_buf_get(mp->m_ddev_targp, 261 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 262 BTOBB(mp->m_sb.sb_blocksize), 263 XBF_LOCK | XBF_MAPPED); 264 block = XFS_BUF_TO_BLOCK(bp); 265 memset(block, 0, mp->m_sb.sb_blocksize); 266 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC); 267 block->bb_level = 0; 268 block->bb_numrecs = cpu_to_be16(1); 269 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 270 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 271 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 272 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 273 arec->ar_blockcount = cpu_to_be32( 274 agsize - be32_to_cpu(arec->ar_startblock)); 275 error = xfs_bwrite(mp, bp); 276 if (error) { 277 goto error0; 278 } 279 /* 280 * CNT btree root block 281 */ 282 bp = xfs_buf_get(mp->m_ddev_targp, 283 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 284 BTOBB(mp->m_sb.sb_blocksize), 285 XBF_LOCK | XBF_MAPPED); 286 block = XFS_BUF_TO_BLOCK(bp); 287 memset(block, 0, mp->m_sb.sb_blocksize); 288 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC); 289 block->bb_level = 0; 290 block->bb_numrecs = cpu_to_be16(1); 291 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 292 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 293 arec = XFS_ALLOC_REC_ADDR(mp, block, 1); 294 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 295 arec->ar_blockcount = cpu_to_be32( 296 agsize - be32_to_cpu(arec->ar_startblock)); 297 nfree += be32_to_cpu(arec->ar_blockcount); 298 error = xfs_bwrite(mp, bp); 299 if (error) { 300 goto error0; 301 } 302 /* 303 * INO btree root block 304 */ 305 bp = xfs_buf_get(mp->m_ddev_targp, 306 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 307 BTOBB(mp->m_sb.sb_blocksize), 308 XBF_LOCK | XBF_MAPPED); 309 block = XFS_BUF_TO_BLOCK(bp); 310 memset(block, 0, mp->m_sb.sb_blocksize); 311 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC); 312 block->bb_level = 0; 313 block->bb_numrecs = 0; 314 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK); 315 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK); 316 error = xfs_bwrite(mp, bp); 317 if (error) { 318 goto error0; 319 } 320 } 321 xfs_trans_agblocks_delta(tp, nfree); 322 /* 323 * There are new blocks in the old last a.g. 324 */ 325 if (new) { 326 /* 327 * Change the agi length. 328 */ 329 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 330 if (error) { 331 goto error0; 332 } 333 ASSERT(bp); 334 agi = XFS_BUF_TO_AGI(bp); 335 be32_add_cpu(&agi->agi_length, new); 336 ASSERT(nagcount == oagcount || 337 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 338 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 339 /* 340 * Change agf length. 341 */ 342 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 343 if (error) { 344 goto error0; 345 } 346 ASSERT(bp); 347 agf = XFS_BUF_TO_AGF(bp); 348 be32_add_cpu(&agf->agf_length, new); 349 ASSERT(be32_to_cpu(agf->agf_length) == 350 be32_to_cpu(agi->agi_length)); 351 352 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 353 /* 354 * Free the new space. 355 */ 356 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 357 be32_to_cpu(agf->agf_length) - new), new); 358 if (error) { 359 goto error0; 360 } 361 } 362 if (nagcount > oagcount) 363 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 364 if (nb > mp->m_sb.sb_dblocks) 365 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 366 nb - mp->m_sb.sb_dblocks); 367 if (nfree) 368 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 369 if (dpct) 370 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 371 error = xfs_trans_commit(tp, 0); 372 if (error) { 373 return error; 374 } 375 /* New allocation groups fully initialized, so update mount struct */ 376 if (nagimax) 377 mp->m_maxagi = nagimax; 378 if (mp->m_sb.sb_imax_pct) { 379 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 380 do_div(icount, 100); 381 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 382 } else 383 mp->m_maxicount = 0; 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