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_shared.h" 21 #include "xfs_format.h" 22 #include "xfs_log_format.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_sb.h" 25 #include "xfs_mount.h" 26 #include "xfs_da_format.h" 27 #include "xfs_da_btree.h" 28 #include "xfs_inode.h" 29 #include "xfs_trans.h" 30 #include "xfs_inode_item.h" 31 #include "xfs_error.h" 32 #include "xfs_btree.h" 33 #include "xfs_alloc_btree.h" 34 #include "xfs_alloc.h" 35 #include "xfs_ialloc.h" 36 #include "xfs_fsops.h" 37 #include "xfs_itable.h" 38 #include "xfs_trans_space.h" 39 #include "xfs_rtalloc.h" 40 #include "xfs_trace.h" 41 #include "xfs_log.h" 42 #include "xfs_filestream.h" 43 44 /* 45 * File system operations 46 */ 47 48 int 49 xfs_fs_geometry( 50 xfs_mount_t *mp, 51 xfs_fsop_geom_t *geo, 52 int new_version) 53 { 54 55 memset(geo, 0, sizeof(*geo)); 56 57 geo->blocksize = mp->m_sb.sb_blocksize; 58 geo->rtextsize = mp->m_sb.sb_rextsize; 59 geo->agblocks = mp->m_sb.sb_agblocks; 60 geo->agcount = mp->m_sb.sb_agcount; 61 geo->logblocks = mp->m_sb.sb_logblocks; 62 geo->sectsize = mp->m_sb.sb_sectsize; 63 geo->inodesize = mp->m_sb.sb_inodesize; 64 geo->imaxpct = mp->m_sb.sb_imax_pct; 65 geo->datablocks = mp->m_sb.sb_dblocks; 66 geo->rtblocks = mp->m_sb.sb_rblocks; 67 geo->rtextents = mp->m_sb.sb_rextents; 68 geo->logstart = mp->m_sb.sb_logstart; 69 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 70 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 71 if (new_version >= 2) { 72 geo->sunit = mp->m_sb.sb_unit; 73 geo->swidth = mp->m_sb.sb_width; 74 } 75 if (new_version >= 3) { 76 geo->version = XFS_FSOP_GEOM_VERSION; 77 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 78 XFS_FSOP_GEOM_FLAGS_DIRV2 | 79 (xfs_sb_version_hasattr(&mp->m_sb) ? 80 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 81 (xfs_sb_version_hasquota(&mp->m_sb) ? 82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 83 (xfs_sb_version_hasalign(&mp->m_sb) ? 84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 85 (xfs_sb_version_hasdalign(&mp->m_sb) ? 86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 87 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 88 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 89 (xfs_sb_version_hassector(&mp->m_sb) ? 90 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 91 (xfs_sb_version_hasasciici(&mp->m_sb) ? 92 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 93 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 94 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 95 (xfs_sb_version_hasattr2(&mp->m_sb) ? 96 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) | 97 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ? 98 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) | 99 (xfs_sb_version_hascrc(&mp->m_sb) ? 100 XFS_FSOP_GEOM_FLAGS_V5SB : 0) | 101 (xfs_sb_version_hasftype(&mp->m_sb) ? 102 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) | 103 (xfs_sb_version_hasfinobt(&mp->m_sb) ? 104 XFS_FSOP_GEOM_FLAGS_FINOBT : 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_dir_geo->blksize; 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 struct xfs_buf * 120 xfs_growfs_get_hdr_buf( 121 struct xfs_mount *mp, 122 xfs_daddr_t blkno, 123 size_t numblks, 124 int flags, 125 const struct xfs_buf_ops *ops) 126 { 127 struct xfs_buf *bp; 128 129 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); 130 if (!bp) 131 return NULL; 132 133 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 134 bp->b_bn = blkno; 135 bp->b_maps[0].bm_bn = blkno; 136 bp->b_ops = ops; 137 138 return bp; 139 } 140 141 static int 142 xfs_growfs_data_private( 143 xfs_mount_t *mp, /* mount point for filesystem */ 144 xfs_growfs_data_t *in) /* growfs data input struct */ 145 { 146 xfs_agf_t *agf; 147 struct xfs_agfl *agfl; 148 xfs_agi_t *agi; 149 xfs_agnumber_t agno; 150 xfs_extlen_t agsize; 151 xfs_extlen_t tmpsize; 152 xfs_alloc_rec_t *arec; 153 xfs_buf_t *bp; 154 int bucket; 155 int dpct; 156 int error, saved_error = 0; 157 xfs_agnumber_t nagcount; 158 xfs_agnumber_t nagimax = 0; 159 xfs_rfsblock_t nb, nb_mod; 160 xfs_rfsblock_t new; 161 xfs_rfsblock_t nfree; 162 xfs_agnumber_t oagcount; 163 int pct; 164 xfs_trans_t *tp; 165 166 nb = in->newblocks; 167 pct = in->imaxpct; 168 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 169 return -EINVAL; 170 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 171 return error; 172 dpct = pct - mp->m_sb.sb_imax_pct; 173 error = xfs_buf_read_uncached(mp->m_ddev_targp, 174 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 175 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); 176 if (error) 177 return error; 178 xfs_buf_relse(bp); 179 180 new = nb; /* use new as a temporary here */ 181 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 182 nagcount = new + (nb_mod != 0); 183 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 184 nagcount--; 185 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 186 if (nb < mp->m_sb.sb_dblocks) 187 return -EINVAL; 188 } 189 new = nb - mp->m_sb.sb_dblocks; 190 oagcount = mp->m_sb.sb_agcount; 191 192 /* allocate the new per-ag structures */ 193 if (nagcount > oagcount) { 194 error = xfs_initialize_perag(mp, nagcount, &nagimax); 195 if (error) 196 return error; 197 } 198 199 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 200 tp->t_flags |= XFS_TRANS_RESERVE; 201 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata, 202 XFS_GROWFS_SPACE_RES(mp), 0); 203 if (error) { 204 xfs_trans_cancel(tp, 0); 205 return error; 206 } 207 208 /* 209 * Write new AG headers to disk. Non-transactional, but written 210 * synchronously so they are completed prior to the growfs transaction 211 * being logged. 212 */ 213 nfree = 0; 214 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 215 __be32 *agfl_bno; 216 217 /* 218 * AG freespace header block 219 */ 220 bp = xfs_growfs_get_hdr_buf(mp, 221 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 222 XFS_FSS_TO_BB(mp, 1), 0, 223 &xfs_agf_buf_ops); 224 if (!bp) { 225 error = -ENOMEM; 226 goto error0; 227 } 228 229 agf = XFS_BUF_TO_AGF(bp); 230 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 231 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 232 agf->agf_seqno = cpu_to_be32(agno); 233 if (agno == nagcount - 1) 234 agsize = 235 nb - 236 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 237 else 238 agsize = mp->m_sb.sb_agblocks; 239 agf->agf_length = cpu_to_be32(agsize); 240 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 241 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 242 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 243 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 244 agf->agf_flfirst = 0; 245 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 246 agf->agf_flcount = 0; 247 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 248 agf->agf_freeblks = cpu_to_be32(tmpsize); 249 agf->agf_longest = cpu_to_be32(tmpsize); 250 if (xfs_sb_version_hascrc(&mp->m_sb)) 251 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid); 252 253 error = xfs_bwrite(bp); 254 xfs_buf_relse(bp); 255 if (error) 256 goto error0; 257 258 /* 259 * AG freelist header block 260 */ 261 bp = xfs_growfs_get_hdr_buf(mp, 262 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), 263 XFS_FSS_TO_BB(mp, 1), 0, 264 &xfs_agfl_buf_ops); 265 if (!bp) { 266 error = -ENOMEM; 267 goto error0; 268 } 269 270 agfl = XFS_BUF_TO_AGFL(bp); 271 if (xfs_sb_version_hascrc(&mp->m_sb)) { 272 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 273 agfl->agfl_seqno = cpu_to_be32(agno); 274 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid); 275 } 276 277 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); 278 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) 279 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 280 281 error = xfs_bwrite(bp); 282 xfs_buf_relse(bp); 283 if (error) 284 goto error0; 285 286 /* 287 * AG inode header block 288 */ 289 bp = xfs_growfs_get_hdr_buf(mp, 290 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 291 XFS_FSS_TO_BB(mp, 1), 0, 292 &xfs_agi_buf_ops); 293 if (!bp) { 294 error = -ENOMEM; 295 goto error0; 296 } 297 298 agi = XFS_BUF_TO_AGI(bp); 299 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 300 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 301 agi->agi_seqno = cpu_to_be32(agno); 302 agi->agi_length = cpu_to_be32(agsize); 303 agi->agi_count = 0; 304 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 305 agi->agi_level = cpu_to_be32(1); 306 agi->agi_freecount = 0; 307 agi->agi_newino = cpu_to_be32(NULLAGINO); 308 agi->agi_dirino = cpu_to_be32(NULLAGINO); 309 if (xfs_sb_version_hascrc(&mp->m_sb)) 310 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid); 311 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 312 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 313 agi->agi_free_level = cpu_to_be32(1); 314 } 315 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 316 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 317 318 error = xfs_bwrite(bp); 319 xfs_buf_relse(bp); 320 if (error) 321 goto error0; 322 323 /* 324 * BNO btree root block 325 */ 326 bp = xfs_growfs_get_hdr_buf(mp, 327 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 328 BTOBB(mp->m_sb.sb_blocksize), 0, 329 &xfs_allocbt_buf_ops); 330 331 if (!bp) { 332 error = -ENOMEM; 333 goto error0; 334 } 335 336 if (xfs_sb_version_hascrc(&mp->m_sb)) 337 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1, 338 agno, XFS_BTREE_CRC_BLOCKS); 339 else 340 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1, 341 agno, 0); 342 343 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 344 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 345 arec->ar_blockcount = cpu_to_be32( 346 agsize - be32_to_cpu(arec->ar_startblock)); 347 348 error = xfs_bwrite(bp); 349 xfs_buf_relse(bp); 350 if (error) 351 goto error0; 352 353 /* 354 * CNT btree root block 355 */ 356 bp = xfs_growfs_get_hdr_buf(mp, 357 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 358 BTOBB(mp->m_sb.sb_blocksize), 0, 359 &xfs_allocbt_buf_ops); 360 if (!bp) { 361 error = -ENOMEM; 362 goto error0; 363 } 364 365 if (xfs_sb_version_hascrc(&mp->m_sb)) 366 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1, 367 agno, XFS_BTREE_CRC_BLOCKS); 368 else 369 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1, 370 agno, 0); 371 372 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 373 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 374 arec->ar_blockcount = cpu_to_be32( 375 agsize - be32_to_cpu(arec->ar_startblock)); 376 nfree += be32_to_cpu(arec->ar_blockcount); 377 378 error = xfs_bwrite(bp); 379 xfs_buf_relse(bp); 380 if (error) 381 goto error0; 382 383 /* 384 * INO btree root block 385 */ 386 bp = xfs_growfs_get_hdr_buf(mp, 387 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 388 BTOBB(mp->m_sb.sb_blocksize), 0, 389 &xfs_inobt_buf_ops); 390 if (!bp) { 391 error = -ENOMEM; 392 goto error0; 393 } 394 395 if (xfs_sb_version_hascrc(&mp->m_sb)) 396 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0, 397 agno, XFS_BTREE_CRC_BLOCKS); 398 else 399 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0, 400 agno, 0); 401 402 error = xfs_bwrite(bp); 403 xfs_buf_relse(bp); 404 if (error) 405 goto error0; 406 407 /* 408 * FINO btree root block 409 */ 410 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 411 bp = xfs_growfs_get_hdr_buf(mp, 412 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)), 413 BTOBB(mp->m_sb.sb_blocksize), 0, 414 &xfs_inobt_buf_ops); 415 if (!bp) { 416 error = -ENOMEM; 417 goto error0; 418 } 419 420 if (xfs_sb_version_hascrc(&mp->m_sb)) 421 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC, 422 0, 0, agno, 423 XFS_BTREE_CRC_BLOCKS); 424 else 425 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0, 426 0, agno, 0); 427 428 error = xfs_bwrite(bp); 429 xfs_buf_relse(bp); 430 if (error) 431 goto error0; 432 } 433 434 } 435 xfs_trans_agblocks_delta(tp, nfree); 436 /* 437 * There are new blocks in the old last a.g. 438 */ 439 if (new) { 440 /* 441 * Change the agi length. 442 */ 443 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 444 if (error) { 445 goto error0; 446 } 447 ASSERT(bp); 448 agi = XFS_BUF_TO_AGI(bp); 449 be32_add_cpu(&agi->agi_length, new); 450 ASSERT(nagcount == oagcount || 451 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 452 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 453 /* 454 * Change agf length. 455 */ 456 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 457 if (error) { 458 goto error0; 459 } 460 ASSERT(bp); 461 agf = XFS_BUF_TO_AGF(bp); 462 be32_add_cpu(&agf->agf_length, new); 463 ASSERT(be32_to_cpu(agf->agf_length) == 464 be32_to_cpu(agi->agi_length)); 465 466 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 467 /* 468 * Free the new space. 469 */ 470 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 471 be32_to_cpu(agf->agf_length) - new), new); 472 if (error) { 473 goto error0; 474 } 475 } 476 477 /* 478 * Update changed superblock fields transactionally. These are not 479 * seen by the rest of the world until the transaction commit applies 480 * them atomically to the superblock. 481 */ 482 if (nagcount > oagcount) 483 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 484 if (nb > mp->m_sb.sb_dblocks) 485 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 486 nb - mp->m_sb.sb_dblocks); 487 if (nfree) 488 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 489 if (dpct) 490 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 491 error = xfs_trans_commit(tp, 0); 492 if (error) 493 return error; 494 495 /* New allocation groups fully initialized, so update mount struct */ 496 if (nagimax) 497 mp->m_maxagi = nagimax; 498 if (mp->m_sb.sb_imax_pct) { 499 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 500 do_div(icount, 100); 501 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 502 } else 503 mp->m_maxicount = 0; 504 xfs_set_low_space_thresholds(mp); 505 506 /* update secondary superblocks. */ 507 for (agno = 1; agno < nagcount; agno++) { 508 error = 0; 509 /* 510 * new secondary superblocks need to be zeroed, not read from 511 * disk as the contents of the new area we are growing into is 512 * completely unknown. 513 */ 514 if (agno < oagcount) { 515 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 516 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 517 XFS_FSS_TO_BB(mp, 1), 0, &bp, 518 &xfs_sb_buf_ops); 519 } else { 520 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, 521 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 522 XFS_FSS_TO_BB(mp, 1), 0); 523 if (bp) { 524 bp->b_ops = &xfs_sb_buf_ops; 525 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 526 } else 527 error = -ENOMEM; 528 } 529 530 /* 531 * If we get an error reading or writing alternate superblocks, 532 * continue. xfs_repair chooses the "best" superblock based 533 * on most matches; if we break early, we'll leave more 534 * superblocks un-updated than updated, and xfs_repair may 535 * pick them over the properly-updated primary. 536 */ 537 if (error) { 538 xfs_warn(mp, 539 "error %d reading secondary superblock for ag %d", 540 error, agno); 541 saved_error = error; 542 continue; 543 } 544 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 545 546 error = xfs_bwrite(bp); 547 xfs_buf_relse(bp); 548 if (error) { 549 xfs_warn(mp, 550 "write error %d updating secondary superblock for ag %d", 551 error, agno); 552 saved_error = error; 553 continue; 554 } 555 } 556 return saved_error ? saved_error : error; 557 558 error0: 559 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 560 return error; 561 } 562 563 static int 564 xfs_growfs_log_private( 565 xfs_mount_t *mp, /* mount point for filesystem */ 566 xfs_growfs_log_t *in) /* growfs log input struct */ 567 { 568 xfs_extlen_t nb; 569 570 nb = in->newblocks; 571 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 572 return -EINVAL; 573 if (nb == mp->m_sb.sb_logblocks && 574 in->isint == (mp->m_sb.sb_logstart != 0)) 575 return -EINVAL; 576 /* 577 * Moving the log is hard, need new interfaces to sync 578 * the log first, hold off all activity while moving it. 579 * Can have shorter or longer log in the same space, 580 * or transform internal to external log or vice versa. 581 */ 582 return -ENOSYS; 583 } 584 585 /* 586 * protected versions of growfs function acquire and release locks on the mount 587 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 588 * XFS_IOC_FSGROWFSRT 589 */ 590 591 592 int 593 xfs_growfs_data( 594 xfs_mount_t *mp, 595 xfs_growfs_data_t *in) 596 { 597 int error; 598 599 if (!capable(CAP_SYS_ADMIN)) 600 return -EPERM; 601 if (!mutex_trylock(&mp->m_growlock)) 602 return -EWOULDBLOCK; 603 error = xfs_growfs_data_private(mp, in); 604 mutex_unlock(&mp->m_growlock); 605 return error; 606 } 607 608 int 609 xfs_growfs_log( 610 xfs_mount_t *mp, 611 xfs_growfs_log_t *in) 612 { 613 int error; 614 615 if (!capable(CAP_SYS_ADMIN)) 616 return -EPERM; 617 if (!mutex_trylock(&mp->m_growlock)) 618 return -EWOULDBLOCK; 619 error = xfs_growfs_log_private(mp, in); 620 mutex_unlock(&mp->m_growlock); 621 return error; 622 } 623 624 /* 625 * exported through ioctl XFS_IOC_FSCOUNTS 626 */ 627 628 int 629 xfs_fs_counts( 630 xfs_mount_t *mp, 631 xfs_fsop_counts_t *cnt) 632 { 633 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 634 spin_lock(&mp->m_sb_lock); 635 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 636 cnt->freertx = mp->m_sb.sb_frextents; 637 cnt->freeino = mp->m_sb.sb_ifree; 638 cnt->allocino = mp->m_sb.sb_icount; 639 spin_unlock(&mp->m_sb_lock); 640 return 0; 641 } 642 643 /* 644 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 645 * 646 * xfs_reserve_blocks is called to set m_resblks 647 * in the in-core mount table. The number of unused reserved blocks 648 * is kept in m_resblks_avail. 649 * 650 * Reserve the requested number of blocks if available. Otherwise return 651 * as many as possible to satisfy the request. The actual number 652 * reserved are returned in outval 653 * 654 * A null inval pointer indicates that only the current reserved blocks 655 * available should be returned no settings are changed. 656 */ 657 658 int 659 xfs_reserve_blocks( 660 xfs_mount_t *mp, 661 __uint64_t *inval, 662 xfs_fsop_resblks_t *outval) 663 { 664 __int64_t lcounter, delta, fdblks_delta; 665 __uint64_t request; 666 667 /* If inval is null, report current values and return */ 668 if (inval == (__uint64_t *)NULL) { 669 if (!outval) 670 return -EINVAL; 671 outval->resblks = mp->m_resblks; 672 outval->resblks_avail = mp->m_resblks_avail; 673 return 0; 674 } 675 676 request = *inval; 677 678 /* 679 * With per-cpu counters, this becomes an interesting 680 * problem. we needto work out if we are freeing or allocation 681 * blocks first, then we can do the modification as necessary. 682 * 683 * We do this under the m_sb_lock so that if we are near 684 * ENOSPC, we will hold out any changes while we work out 685 * what to do. This means that the amount of free space can 686 * change while we do this, so we need to retry if we end up 687 * trying to reserve more space than is available. 688 * 689 * We also use the xfs_mod_incore_sb() interface so that we 690 * don't have to care about whether per cpu counter are 691 * enabled, disabled or even compiled in.... 692 */ 693 retry: 694 spin_lock(&mp->m_sb_lock); 695 xfs_icsb_sync_counters_locked(mp, 0); 696 697 /* 698 * If our previous reservation was larger than the current value, 699 * then move any unused blocks back to the free pool. 700 */ 701 fdblks_delta = 0; 702 if (mp->m_resblks > request) { 703 lcounter = mp->m_resblks_avail - request; 704 if (lcounter > 0) { /* release unused blocks */ 705 fdblks_delta = lcounter; 706 mp->m_resblks_avail -= lcounter; 707 } 708 mp->m_resblks = request; 709 } else { 710 __int64_t free; 711 712 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 713 if (!free) 714 goto out; /* ENOSPC and fdblks_delta = 0 */ 715 716 delta = request - mp->m_resblks; 717 lcounter = free - delta; 718 if (lcounter < 0) { 719 /* We can't satisfy the request, just get what we can */ 720 mp->m_resblks += free; 721 mp->m_resblks_avail += free; 722 fdblks_delta = -free; 723 } else { 724 fdblks_delta = -delta; 725 mp->m_resblks = request; 726 mp->m_resblks_avail += delta; 727 } 728 } 729 out: 730 if (outval) { 731 outval->resblks = mp->m_resblks; 732 outval->resblks_avail = mp->m_resblks_avail; 733 } 734 spin_unlock(&mp->m_sb_lock); 735 736 if (fdblks_delta) { 737 /* 738 * If we are putting blocks back here, m_resblks_avail is 739 * already at its max so this will put it in the free pool. 740 * 741 * If we need space, we'll either succeed in getting it 742 * from the free block count or we'll get an enospc. If 743 * we get a ENOSPC, it means things changed while we were 744 * calculating fdblks_delta and so we should try again to 745 * see if there is anything left to reserve. 746 * 747 * Don't set the reserved flag here - we don't want to reserve 748 * the extra reserve blocks from the reserve..... 749 */ 750 int error; 751 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, 752 fdblks_delta, 0); 753 if (error == -ENOSPC) 754 goto retry; 755 } 756 return 0; 757 } 758 759 /* 760 * Dump a transaction into the log that contains no real change. This is needed 761 * to be able to make the log dirty or stamp the current tail LSN into the log 762 * during the covering operation. 763 * 764 * We cannot use an inode here for this - that will push dirty state back up 765 * into the VFS and then periodic inode flushing will prevent log covering from 766 * making progress. Hence we log a field in the superblock instead and use a 767 * synchronous transaction to ensure the superblock is immediately unpinned 768 * and can be written back. 769 */ 770 int 771 xfs_fs_log_dummy( 772 xfs_mount_t *mp) 773 { 774 xfs_trans_t *tp; 775 int error; 776 777 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 778 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); 779 if (error) { 780 xfs_trans_cancel(tp, 0); 781 return error; 782 } 783 784 /* log the UUID because it is an unchanging field */ 785 xfs_mod_sb(tp, XFS_SB_UUID); 786 xfs_trans_set_sync(tp); 787 return xfs_trans_commit(tp, 0); 788 } 789 790 int 791 xfs_fs_goingdown( 792 xfs_mount_t *mp, 793 __uint32_t inflags) 794 { 795 switch (inflags) { 796 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 797 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 798 799 if (sb && !IS_ERR(sb)) { 800 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 801 thaw_bdev(sb->s_bdev, sb); 802 } 803 804 break; 805 } 806 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 807 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 808 break; 809 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 810 xfs_force_shutdown(mp, 811 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 812 break; 813 default: 814 return -EINVAL; 815 } 816 817 return 0; 818 } 819 820 /* 821 * Force a shutdown of the filesystem instantly while keeping the filesystem 822 * consistent. We don't do an unmount here; just shutdown the shop, make sure 823 * that absolutely nothing persistent happens to this filesystem after this 824 * point. 825 */ 826 void 827 xfs_do_force_shutdown( 828 xfs_mount_t *mp, 829 int flags, 830 char *fname, 831 int lnnum) 832 { 833 int logerror; 834 835 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 836 837 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 838 xfs_notice(mp, 839 "%s(0x%x) called from line %d of file %s. Return address = 0x%p", 840 __func__, flags, lnnum, fname, __return_address); 841 } 842 /* 843 * No need to duplicate efforts. 844 */ 845 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 846 return; 847 848 /* 849 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 850 * queue up anybody new on the log reservations, and wakes up 851 * everybody who's sleeping on log reservations to tell them 852 * the bad news. 853 */ 854 if (xfs_log_force_umount(mp, logerror)) 855 return; 856 857 if (flags & SHUTDOWN_CORRUPT_INCORE) { 858 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 859 "Corruption of in-memory data detected. Shutting down filesystem"); 860 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 861 xfs_stack_trace(); 862 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 863 if (logerror) { 864 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 865 "Log I/O Error Detected. Shutting down filesystem"); 866 } else if (flags & SHUTDOWN_DEVICE_REQ) { 867 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 868 "All device paths lost. Shutting down filesystem"); 869 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 870 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 871 "I/O Error Detected. Shutting down filesystem"); 872 } 873 } 874 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 875 xfs_alert(mp, 876 "Please umount the filesystem and rectify the problem(s)"); 877 } 878 } 879