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_ag.h" 26 #include "xfs_mount.h" 27 #include "xfs_da_format.h" 28 #include "xfs_da_btree.h" 29 #include "xfs_inode.h" 30 #include "xfs_trans.h" 31 #include "xfs_inode_item.h" 32 #include "xfs_error.h" 33 #include "xfs_btree.h" 34 #include "xfs_alloc_btree.h" 35 #include "xfs_alloc.h" 36 #include "xfs_ialloc.h" 37 #include "xfs_fsops.h" 38 #include "xfs_itable.h" 39 #include "xfs_trans_space.h" 40 #include "xfs_rtalloc.h" 41 #include "xfs_trace.h" 42 #include "xfs_log.h" 43 #include "xfs_filestream.h" 44 45 /* 46 * File system operations 47 */ 48 49 int 50 xfs_fs_geometry( 51 xfs_mount_t *mp, 52 xfs_fsop_geom_t *geo, 53 int new_version) 54 { 55 56 memset(geo, 0, sizeof(*geo)); 57 58 geo->blocksize = mp->m_sb.sb_blocksize; 59 geo->rtextsize = mp->m_sb.sb_rextsize; 60 geo->agblocks = mp->m_sb.sb_agblocks; 61 geo->agcount = mp->m_sb.sb_agcount; 62 geo->logblocks = mp->m_sb.sb_logblocks; 63 geo->sectsize = mp->m_sb.sb_sectsize; 64 geo->inodesize = mp->m_sb.sb_inodesize; 65 geo->imaxpct = mp->m_sb.sb_imax_pct; 66 geo->datablocks = mp->m_sb.sb_dblocks; 67 geo->rtblocks = mp->m_sb.sb_rblocks; 68 geo->rtextents = mp->m_sb.sb_rextents; 69 geo->logstart = mp->m_sb.sb_logstart; 70 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 71 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 72 if (new_version >= 2) { 73 geo->sunit = mp->m_sb.sb_unit; 74 geo->swidth = mp->m_sb.sb_width; 75 } 76 if (new_version >= 3) { 77 geo->version = XFS_FSOP_GEOM_VERSION; 78 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 79 XFS_FSOP_GEOM_FLAGS_DIRV2 | 80 (xfs_sb_version_hasattr(&mp->m_sb) ? 81 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 82 (xfs_sb_version_hasquota(&mp->m_sb) ? 83 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 84 (xfs_sb_version_hasalign(&mp->m_sb) ? 85 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 86 (xfs_sb_version_hasdalign(&mp->m_sb) ? 87 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 88 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 89 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 90 (xfs_sb_version_hassector(&mp->m_sb) ? 91 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 92 (xfs_sb_version_hasasciici(&mp->m_sb) ? 93 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 94 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 95 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 96 (xfs_sb_version_hasattr2(&mp->m_sb) ? 97 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) | 98 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ? 99 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) | 100 (xfs_sb_version_hascrc(&mp->m_sb) ? 101 XFS_FSOP_GEOM_FLAGS_V5SB : 0) | 102 (xfs_sb_version_hasftype(&mp->m_sb) ? 103 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) | 104 (xfs_sb_version_hasfinobt(&mp->m_sb) ? 105 XFS_FSOP_GEOM_FLAGS_FINOBT : 0); 106 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 107 mp->m_sb.sb_logsectsize : BBSIZE; 108 geo->rtsectsize = mp->m_sb.sb_blocksize; 109 geo->dirblocksize = mp->m_dir_geo->blksize; 110 } 111 if (new_version >= 4) { 112 geo->flags |= 113 (xfs_sb_version_haslogv2(&mp->m_sb) ? 114 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 115 geo->logsunit = mp->m_sb.sb_logsunit; 116 } 117 return 0; 118 } 119 120 static struct xfs_buf * 121 xfs_growfs_get_hdr_buf( 122 struct xfs_mount *mp, 123 xfs_daddr_t blkno, 124 size_t numblks, 125 int flags, 126 const struct xfs_buf_ops *ops) 127 { 128 struct xfs_buf *bp; 129 130 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); 131 if (!bp) 132 return NULL; 133 134 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 135 bp->b_bn = blkno; 136 bp->b_maps[0].bm_bn = blkno; 137 bp->b_ops = ops; 138 139 return bp; 140 } 141 142 static int 143 xfs_growfs_data_private( 144 xfs_mount_t *mp, /* mount point for filesystem */ 145 xfs_growfs_data_t *in) /* growfs data input struct */ 146 { 147 xfs_agf_t *agf; 148 struct xfs_agfl *agfl; 149 xfs_agi_t *agi; 150 xfs_agnumber_t agno; 151 xfs_extlen_t agsize; 152 xfs_extlen_t tmpsize; 153 xfs_alloc_rec_t *arec; 154 xfs_buf_t *bp; 155 int bucket; 156 int dpct; 157 int error, saved_error = 0; 158 xfs_agnumber_t nagcount; 159 xfs_agnumber_t nagimax = 0; 160 xfs_rfsblock_t nb, nb_mod; 161 xfs_rfsblock_t new; 162 xfs_rfsblock_t nfree; 163 xfs_agnumber_t oagcount; 164 int pct; 165 xfs_trans_t *tp; 166 167 nb = in->newblocks; 168 pct = in->imaxpct; 169 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 170 return -EINVAL; 171 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 172 return error; 173 dpct = pct - mp->m_sb.sb_imax_pct; 174 error = xfs_buf_read_uncached(mp->m_ddev_targp, 175 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 176 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); 177 if (error) 178 return error; 179 xfs_buf_relse(bp); 180 181 new = nb; /* use new as a temporary here */ 182 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 183 nagcount = new + (nb_mod != 0); 184 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 185 nagcount--; 186 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 187 if (nb < mp->m_sb.sb_dblocks) 188 return -EINVAL; 189 } 190 new = nb - mp->m_sb.sb_dblocks; 191 oagcount = mp->m_sb.sb_agcount; 192 193 /* allocate the new per-ag structures */ 194 if (nagcount > oagcount) { 195 error = xfs_initialize_perag(mp, nagcount, &nagimax); 196 if (error) 197 return error; 198 } 199 200 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 201 tp->t_flags |= XFS_TRANS_RESERVE; 202 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata, 203 XFS_GROWFS_SPACE_RES(mp), 0); 204 if (error) { 205 xfs_trans_cancel(tp, 0); 206 return error; 207 } 208 209 /* 210 * Write new AG headers to disk. Non-transactional, but written 211 * synchronously so they are completed prior to the growfs transaction 212 * being logged. 213 */ 214 nfree = 0; 215 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 216 __be32 *agfl_bno; 217 218 /* 219 * AG freespace header block 220 */ 221 bp = xfs_growfs_get_hdr_buf(mp, 222 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 223 XFS_FSS_TO_BB(mp, 1), 0, 224 &xfs_agf_buf_ops); 225 if (!bp) { 226 error = -ENOMEM; 227 goto error0; 228 } 229 230 agf = XFS_BUF_TO_AGF(bp); 231 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 232 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 233 agf->agf_seqno = cpu_to_be32(agno); 234 if (agno == nagcount - 1) 235 agsize = 236 nb - 237 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 238 else 239 agsize = mp->m_sb.sb_agblocks; 240 agf->agf_length = cpu_to_be32(agsize); 241 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 242 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 243 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 244 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 245 agf->agf_flfirst = 0; 246 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 247 agf->agf_flcount = 0; 248 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 249 agf->agf_freeblks = cpu_to_be32(tmpsize); 250 agf->agf_longest = cpu_to_be32(tmpsize); 251 if (xfs_sb_version_hascrc(&mp->m_sb)) 252 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid); 253 254 error = xfs_bwrite(bp); 255 xfs_buf_relse(bp); 256 if (error) 257 goto error0; 258 259 /* 260 * AG freelist header block 261 */ 262 bp = xfs_growfs_get_hdr_buf(mp, 263 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), 264 XFS_FSS_TO_BB(mp, 1), 0, 265 &xfs_agfl_buf_ops); 266 if (!bp) { 267 error = -ENOMEM; 268 goto error0; 269 } 270 271 agfl = XFS_BUF_TO_AGFL(bp); 272 if (xfs_sb_version_hascrc(&mp->m_sb)) { 273 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 274 agfl->agfl_seqno = cpu_to_be32(agno); 275 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid); 276 } 277 278 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); 279 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) 280 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 281 282 error = xfs_bwrite(bp); 283 xfs_buf_relse(bp); 284 if (error) 285 goto error0; 286 287 /* 288 * AG inode header block 289 */ 290 bp = xfs_growfs_get_hdr_buf(mp, 291 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 292 XFS_FSS_TO_BB(mp, 1), 0, 293 &xfs_agi_buf_ops); 294 if (!bp) { 295 error = -ENOMEM; 296 goto error0; 297 } 298 299 agi = XFS_BUF_TO_AGI(bp); 300 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 301 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 302 agi->agi_seqno = cpu_to_be32(agno); 303 agi->agi_length = cpu_to_be32(agsize); 304 agi->agi_count = 0; 305 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 306 agi->agi_level = cpu_to_be32(1); 307 agi->agi_freecount = 0; 308 agi->agi_newino = cpu_to_be32(NULLAGINO); 309 agi->agi_dirino = cpu_to_be32(NULLAGINO); 310 if (xfs_sb_version_hascrc(&mp->m_sb)) 311 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid); 312 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 313 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 314 agi->agi_free_level = cpu_to_be32(1); 315 } 316 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 317 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 318 319 error = xfs_bwrite(bp); 320 xfs_buf_relse(bp); 321 if (error) 322 goto error0; 323 324 /* 325 * BNO btree root block 326 */ 327 bp = xfs_growfs_get_hdr_buf(mp, 328 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 329 BTOBB(mp->m_sb.sb_blocksize), 0, 330 &xfs_allocbt_buf_ops); 331 332 if (!bp) { 333 error = -ENOMEM; 334 goto error0; 335 } 336 337 if (xfs_sb_version_hascrc(&mp->m_sb)) 338 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1, 339 agno, XFS_BTREE_CRC_BLOCKS); 340 else 341 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1, 342 agno, 0); 343 344 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 345 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 346 arec->ar_blockcount = cpu_to_be32( 347 agsize - be32_to_cpu(arec->ar_startblock)); 348 349 error = xfs_bwrite(bp); 350 xfs_buf_relse(bp); 351 if (error) 352 goto error0; 353 354 /* 355 * CNT btree root block 356 */ 357 bp = xfs_growfs_get_hdr_buf(mp, 358 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 359 BTOBB(mp->m_sb.sb_blocksize), 0, 360 &xfs_allocbt_buf_ops); 361 if (!bp) { 362 error = -ENOMEM; 363 goto error0; 364 } 365 366 if (xfs_sb_version_hascrc(&mp->m_sb)) 367 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1, 368 agno, XFS_BTREE_CRC_BLOCKS); 369 else 370 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1, 371 agno, 0); 372 373 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 374 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 375 arec->ar_blockcount = cpu_to_be32( 376 agsize - be32_to_cpu(arec->ar_startblock)); 377 nfree += be32_to_cpu(arec->ar_blockcount); 378 379 error = xfs_bwrite(bp); 380 xfs_buf_relse(bp); 381 if (error) 382 goto error0; 383 384 /* 385 * INO btree root block 386 */ 387 bp = xfs_growfs_get_hdr_buf(mp, 388 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 389 BTOBB(mp->m_sb.sb_blocksize), 0, 390 &xfs_inobt_buf_ops); 391 if (!bp) { 392 error = -ENOMEM; 393 goto error0; 394 } 395 396 if (xfs_sb_version_hascrc(&mp->m_sb)) 397 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0, 398 agno, XFS_BTREE_CRC_BLOCKS); 399 else 400 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0, 401 agno, 0); 402 403 error = xfs_bwrite(bp); 404 xfs_buf_relse(bp); 405 if (error) 406 goto error0; 407 408 /* 409 * FINO btree root block 410 */ 411 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 412 bp = xfs_growfs_get_hdr_buf(mp, 413 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)), 414 BTOBB(mp->m_sb.sb_blocksize), 0, 415 &xfs_inobt_buf_ops); 416 if (!bp) { 417 error = -ENOMEM; 418 goto error0; 419 } 420 421 if (xfs_sb_version_hascrc(&mp->m_sb)) 422 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC, 423 0, 0, agno, 424 XFS_BTREE_CRC_BLOCKS); 425 else 426 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0, 427 0, agno, 0); 428 429 error = xfs_bwrite(bp); 430 xfs_buf_relse(bp); 431 if (error) 432 goto error0; 433 } 434 435 } 436 xfs_trans_agblocks_delta(tp, nfree); 437 /* 438 * There are new blocks in the old last a.g. 439 */ 440 if (new) { 441 /* 442 * Change the agi length. 443 */ 444 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 445 if (error) { 446 goto error0; 447 } 448 ASSERT(bp); 449 agi = XFS_BUF_TO_AGI(bp); 450 be32_add_cpu(&agi->agi_length, new); 451 ASSERT(nagcount == oagcount || 452 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 453 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 454 /* 455 * Change agf length. 456 */ 457 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 458 if (error) { 459 goto error0; 460 } 461 ASSERT(bp); 462 agf = XFS_BUF_TO_AGF(bp); 463 be32_add_cpu(&agf->agf_length, new); 464 ASSERT(be32_to_cpu(agf->agf_length) == 465 be32_to_cpu(agi->agi_length)); 466 467 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 468 /* 469 * Free the new space. 470 */ 471 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 472 be32_to_cpu(agf->agf_length) - new), new); 473 if (error) { 474 goto error0; 475 } 476 } 477 478 /* 479 * Update changed superblock fields transactionally. These are not 480 * seen by the rest of the world until the transaction commit applies 481 * them atomically to the superblock. 482 */ 483 if (nagcount > oagcount) 484 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 485 if (nb > mp->m_sb.sb_dblocks) 486 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 487 nb - mp->m_sb.sb_dblocks); 488 if (nfree) 489 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 490 if (dpct) 491 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 492 error = xfs_trans_commit(tp, 0); 493 if (error) 494 return error; 495 496 /* New allocation groups fully initialized, so update mount struct */ 497 if (nagimax) 498 mp->m_maxagi = nagimax; 499 if (mp->m_sb.sb_imax_pct) { 500 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 501 do_div(icount, 100); 502 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 503 } else 504 mp->m_maxicount = 0; 505 xfs_set_low_space_thresholds(mp); 506 507 /* update secondary superblocks. */ 508 for (agno = 1; agno < nagcount; agno++) { 509 error = 0; 510 /* 511 * new secondary superblocks need to be zeroed, not read from 512 * disk as the contents of the new area we are growing into is 513 * completely unknown. 514 */ 515 if (agno < oagcount) { 516 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 517 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 518 XFS_FSS_TO_BB(mp, 1), 0, &bp, 519 &xfs_sb_buf_ops); 520 } else { 521 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, 522 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 523 XFS_FSS_TO_BB(mp, 1), 0); 524 if (bp) { 525 bp->b_ops = &xfs_sb_buf_ops; 526 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 527 } else 528 error = -ENOMEM; 529 } 530 531 /* 532 * If we get an error reading or writing alternate superblocks, 533 * continue. xfs_repair chooses the "best" superblock based 534 * on most matches; if we break early, we'll leave more 535 * superblocks un-updated than updated, and xfs_repair may 536 * pick them over the properly-updated primary. 537 */ 538 if (error) { 539 xfs_warn(mp, 540 "error %d reading secondary superblock for ag %d", 541 error, agno); 542 saved_error = error; 543 continue; 544 } 545 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 546 547 error = xfs_bwrite(bp); 548 xfs_buf_relse(bp); 549 if (error) { 550 xfs_warn(mp, 551 "write error %d updating secondary superblock for ag %d", 552 error, agno); 553 saved_error = error; 554 continue; 555 } 556 } 557 return saved_error ? saved_error : error; 558 559 error0: 560 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 561 return error; 562 } 563 564 static int 565 xfs_growfs_log_private( 566 xfs_mount_t *mp, /* mount point for filesystem */ 567 xfs_growfs_log_t *in) /* growfs log input struct */ 568 { 569 xfs_extlen_t nb; 570 571 nb = in->newblocks; 572 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 573 return -EINVAL; 574 if (nb == mp->m_sb.sb_logblocks && 575 in->isint == (mp->m_sb.sb_logstart != 0)) 576 return -EINVAL; 577 /* 578 * Moving the log is hard, need new interfaces to sync 579 * the log first, hold off all activity while moving it. 580 * Can have shorter or longer log in the same space, 581 * or transform internal to external log or vice versa. 582 */ 583 return -ENOSYS; 584 } 585 586 /* 587 * protected versions of growfs function acquire and release locks on the mount 588 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 589 * XFS_IOC_FSGROWFSRT 590 */ 591 592 593 int 594 xfs_growfs_data( 595 xfs_mount_t *mp, 596 xfs_growfs_data_t *in) 597 { 598 int error; 599 600 if (!capable(CAP_SYS_ADMIN)) 601 return -EPERM; 602 if (!mutex_trylock(&mp->m_growlock)) 603 return -EWOULDBLOCK; 604 error = xfs_growfs_data_private(mp, in); 605 mutex_unlock(&mp->m_growlock); 606 return error; 607 } 608 609 int 610 xfs_growfs_log( 611 xfs_mount_t *mp, 612 xfs_growfs_log_t *in) 613 { 614 int error; 615 616 if (!capable(CAP_SYS_ADMIN)) 617 return -EPERM; 618 if (!mutex_trylock(&mp->m_growlock)) 619 return -EWOULDBLOCK; 620 error = xfs_growfs_log_private(mp, in); 621 mutex_unlock(&mp->m_growlock); 622 return error; 623 } 624 625 /* 626 * exported through ioctl XFS_IOC_FSCOUNTS 627 */ 628 629 int 630 xfs_fs_counts( 631 xfs_mount_t *mp, 632 xfs_fsop_counts_t *cnt) 633 { 634 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 635 spin_lock(&mp->m_sb_lock); 636 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 637 cnt->freertx = mp->m_sb.sb_frextents; 638 cnt->freeino = mp->m_sb.sb_ifree; 639 cnt->allocino = mp->m_sb.sb_icount; 640 spin_unlock(&mp->m_sb_lock); 641 return 0; 642 } 643 644 /* 645 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 646 * 647 * xfs_reserve_blocks is called to set m_resblks 648 * in the in-core mount table. The number of unused reserved blocks 649 * is kept in m_resblks_avail. 650 * 651 * Reserve the requested number of blocks if available. Otherwise return 652 * as many as possible to satisfy the request. The actual number 653 * reserved are returned in outval 654 * 655 * A null inval pointer indicates that only the current reserved blocks 656 * available should be returned no settings are changed. 657 */ 658 659 int 660 xfs_reserve_blocks( 661 xfs_mount_t *mp, 662 __uint64_t *inval, 663 xfs_fsop_resblks_t *outval) 664 { 665 __int64_t lcounter, delta, fdblks_delta; 666 __uint64_t request; 667 668 /* If inval is null, report current values and return */ 669 if (inval == (__uint64_t *)NULL) { 670 if (!outval) 671 return -EINVAL; 672 outval->resblks = mp->m_resblks; 673 outval->resblks_avail = mp->m_resblks_avail; 674 return 0; 675 } 676 677 request = *inval; 678 679 /* 680 * With per-cpu counters, this becomes an interesting 681 * problem. we needto work out if we are freeing or allocation 682 * blocks first, then we can do the modification as necessary. 683 * 684 * We do this under the m_sb_lock so that if we are near 685 * ENOSPC, we will hold out any changes while we work out 686 * what to do. This means that the amount of free space can 687 * change while we do this, so we need to retry if we end up 688 * trying to reserve more space than is available. 689 * 690 * We also use the xfs_mod_incore_sb() interface so that we 691 * don't have to care about whether per cpu counter are 692 * enabled, disabled or even compiled in.... 693 */ 694 retry: 695 spin_lock(&mp->m_sb_lock); 696 xfs_icsb_sync_counters_locked(mp, 0); 697 698 /* 699 * If our previous reservation was larger than the current value, 700 * then move any unused blocks back to the free pool. 701 */ 702 fdblks_delta = 0; 703 if (mp->m_resblks > request) { 704 lcounter = mp->m_resblks_avail - request; 705 if (lcounter > 0) { /* release unused blocks */ 706 fdblks_delta = lcounter; 707 mp->m_resblks_avail -= lcounter; 708 } 709 mp->m_resblks = request; 710 } else { 711 __int64_t free; 712 713 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 714 if (!free) 715 goto out; /* ENOSPC and fdblks_delta = 0 */ 716 717 delta = request - mp->m_resblks; 718 lcounter = free - delta; 719 if (lcounter < 0) { 720 /* We can't satisfy the request, just get what we can */ 721 mp->m_resblks += free; 722 mp->m_resblks_avail += free; 723 fdblks_delta = -free; 724 } else { 725 fdblks_delta = -delta; 726 mp->m_resblks = request; 727 mp->m_resblks_avail += delta; 728 } 729 } 730 out: 731 if (outval) { 732 outval->resblks = mp->m_resblks; 733 outval->resblks_avail = mp->m_resblks_avail; 734 } 735 spin_unlock(&mp->m_sb_lock); 736 737 if (fdblks_delta) { 738 /* 739 * If we are putting blocks back here, m_resblks_avail is 740 * already at its max so this will put it in the free pool. 741 * 742 * If we need space, we'll either succeed in getting it 743 * from the free block count or we'll get an enospc. If 744 * we get a ENOSPC, it means things changed while we were 745 * calculating fdblks_delta and so we should try again to 746 * see if there is anything left to reserve. 747 * 748 * Don't set the reserved flag here - we don't want to reserve 749 * the extra reserve blocks from the reserve..... 750 */ 751 int error; 752 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, 753 fdblks_delta, 0); 754 if (error == -ENOSPC) 755 goto retry; 756 } 757 return 0; 758 } 759 760 /* 761 * Dump a transaction into the log that contains no real change. This is needed 762 * to be able to make the log dirty or stamp the current tail LSN into the log 763 * during the covering operation. 764 * 765 * We cannot use an inode here for this - that will push dirty state back up 766 * into the VFS and then periodic inode flushing will prevent log covering from 767 * making progress. Hence we log a field in the superblock instead and use a 768 * synchronous transaction to ensure the superblock is immediately unpinned 769 * and can be written back. 770 */ 771 int 772 xfs_fs_log_dummy( 773 xfs_mount_t *mp) 774 { 775 xfs_trans_t *tp; 776 int error; 777 778 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 779 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); 780 if (error) { 781 xfs_trans_cancel(tp, 0); 782 return error; 783 } 784 785 /* log the UUID because it is an unchanging field */ 786 xfs_mod_sb(tp, XFS_SB_UUID); 787 xfs_trans_set_sync(tp); 788 return xfs_trans_commit(tp, 0); 789 } 790 791 int 792 xfs_fs_goingdown( 793 xfs_mount_t *mp, 794 __uint32_t inflags) 795 { 796 switch (inflags) { 797 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 798 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 799 800 if (sb && !IS_ERR(sb)) { 801 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 802 thaw_bdev(sb->s_bdev, sb); 803 } 804 805 break; 806 } 807 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 808 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 809 break; 810 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 811 xfs_force_shutdown(mp, 812 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 813 break; 814 default: 815 return -EINVAL; 816 } 817 818 return 0; 819 } 820 821 /* 822 * Force a shutdown of the filesystem instantly while keeping the filesystem 823 * consistent. We don't do an unmount here; just shutdown the shop, make sure 824 * that absolutely nothing persistent happens to this filesystem after this 825 * point. 826 */ 827 void 828 xfs_do_force_shutdown( 829 xfs_mount_t *mp, 830 int flags, 831 char *fname, 832 int lnnum) 833 { 834 int logerror; 835 836 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 837 838 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 839 xfs_notice(mp, 840 "%s(0x%x) called from line %d of file %s. Return address = 0x%p", 841 __func__, flags, lnnum, fname, __return_address); 842 } 843 /* 844 * No need to duplicate efforts. 845 */ 846 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 847 return; 848 849 /* 850 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 851 * queue up anybody new on the log reservations, and wakes up 852 * everybody who's sleeping on log reservations to tell them 853 * the bad news. 854 */ 855 if (xfs_log_force_umount(mp, logerror)) 856 return; 857 858 if (flags & SHUTDOWN_CORRUPT_INCORE) { 859 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 860 "Corruption of in-memory data detected. Shutting down filesystem"); 861 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 862 xfs_stack_trace(); 863 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 864 if (logerror) { 865 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 866 "Log I/O Error Detected. Shutting down filesystem"); 867 } else if (flags & SHUTDOWN_DEVICE_REQ) { 868 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 869 "All device paths lost. Shutting down filesystem"); 870 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 871 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 872 "I/O Error Detected. Shutting down filesystem"); 873 } 874 } 875 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 876 xfs_alert(mp, 877 "Please umount the filesystem and rectify the problem(s)"); 878 } 879 } 880