1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_shared.h" 9 #include "xfs_format.h" 10 #include "xfs_log_format.h" 11 #include "xfs_trans_resv.h" 12 #include "xfs_bit.h" 13 #include "xfs_sb.h" 14 #include "xfs_mount.h" 15 #include "xfs_ialloc.h" 16 #include "xfs_alloc.h" 17 #include "xfs_error.h" 18 #include "xfs_trans.h" 19 #include "xfs_buf_item.h" 20 #include "xfs_bmap_btree.h" 21 #include "xfs_alloc_btree.h" 22 #include "xfs_log.h" 23 #include "xfs_rmap_btree.h" 24 #include "xfs_refcount_btree.h" 25 #include "xfs_da_format.h" 26 #include "xfs_health.h" 27 #include "xfs_ag.h" 28 29 /* 30 * Physical superblock buffer manipulations. Shared with libxfs in userspace. 31 */ 32 33 /* 34 * Check that all the V4 feature bits that the V5 filesystem format requires are 35 * correctly set. 36 */ 37 static bool 38 xfs_sb_validate_v5_features( 39 struct xfs_sb *sbp) 40 { 41 /* We must not have any unknown V4 feature bits set */ 42 if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) 43 return false; 44 45 /* 46 * The CRC bit is considered an invalid V4 flag, so we have to add it 47 * manually to the OKBITS mask. 48 */ 49 if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS | 50 XFS_SB_VERSION2_CRCBIT)) 51 return false; 52 53 /* Now check all the required V4 feature flags are set. */ 54 55 #define V5_VERS_FLAGS (XFS_SB_VERSION_NLINKBIT | \ 56 XFS_SB_VERSION_ALIGNBIT | \ 57 XFS_SB_VERSION_LOGV2BIT | \ 58 XFS_SB_VERSION_EXTFLGBIT | \ 59 XFS_SB_VERSION_DIRV2BIT | \ 60 XFS_SB_VERSION_MOREBITSBIT) 61 62 #define V5_FEAT_FLAGS (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 63 XFS_SB_VERSION2_ATTR2BIT | \ 64 XFS_SB_VERSION2_PROJID32BIT | \ 65 XFS_SB_VERSION2_CRCBIT) 66 67 if ((sbp->sb_versionnum & V5_VERS_FLAGS) != V5_VERS_FLAGS) 68 return false; 69 if ((sbp->sb_features2 & V5_FEAT_FLAGS) != V5_FEAT_FLAGS) 70 return false; 71 return true; 72 } 73 74 /* 75 * We current support XFS v5 formats with known features and v4 superblocks with 76 * at least V2 directories. 77 */ 78 bool 79 xfs_sb_good_version( 80 struct xfs_sb *sbp) 81 { 82 /* 83 * All v5 filesystems are supported, but we must check that all the 84 * required v4 feature flags are enabled correctly as the code checks 85 * those flags and not for v5 support. 86 */ 87 if (xfs_sb_is_v5(sbp)) 88 return xfs_sb_validate_v5_features(sbp); 89 90 /* versions prior to v4 are not supported */ 91 if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_4) 92 return false; 93 94 /* We must not have any unknown v4 feature bits set */ 95 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 96 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 97 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 98 return false; 99 100 /* V4 filesystems need v2 directories and unwritten extents */ 101 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 102 return false; 103 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)) 104 return false; 105 106 /* It's a supported v4 filesystem */ 107 return true; 108 } 109 110 uint64_t 111 xfs_sb_version_to_features( 112 struct xfs_sb *sbp) 113 { 114 uint64_t features = 0; 115 116 /* optional V4 features */ 117 if (sbp->sb_rblocks > 0) 118 features |= XFS_FEAT_REALTIME; 119 if (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT) 120 features |= XFS_FEAT_NLINK; 121 if (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT) 122 features |= XFS_FEAT_ATTR; 123 if (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT) 124 features |= XFS_FEAT_QUOTA; 125 if (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT) 126 features |= XFS_FEAT_ALIGN; 127 if (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT) 128 features |= XFS_FEAT_LOGV2; 129 if (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT) 130 features |= XFS_FEAT_DALIGN; 131 if (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT) 132 features |= XFS_FEAT_EXTFLG; 133 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) 134 features |= XFS_FEAT_SECTOR; 135 if (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT) 136 features |= XFS_FEAT_ASCIICI; 137 if (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) { 138 if (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT) 139 features |= XFS_FEAT_LAZYSBCOUNT; 140 if (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT) 141 features |= XFS_FEAT_ATTR2; 142 if (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT) 143 features |= XFS_FEAT_PROJID32; 144 if (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE) 145 features |= XFS_FEAT_FTYPE; 146 } 147 148 if (!xfs_sb_is_v5(sbp)) 149 return features; 150 151 /* Always on V5 features */ 152 features |= XFS_FEAT_ALIGN | XFS_FEAT_LOGV2 | XFS_FEAT_EXTFLG | 153 XFS_FEAT_LAZYSBCOUNT | XFS_FEAT_ATTR2 | XFS_FEAT_PROJID32 | 154 XFS_FEAT_V3INODES | XFS_FEAT_CRC | XFS_FEAT_PQUOTINO; 155 156 /* Optional V5 features */ 157 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT) 158 features |= XFS_FEAT_FINOBT; 159 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT) 160 features |= XFS_FEAT_RMAPBT; 161 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK) 162 features |= XFS_FEAT_REFLINK; 163 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 164 features |= XFS_FEAT_INOBTCNT; 165 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE) 166 features |= XFS_FEAT_FTYPE; 167 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) 168 features |= XFS_FEAT_SPINODES; 169 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 170 features |= XFS_FEAT_META_UUID; 171 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME) 172 features |= XFS_FEAT_BIGTIME; 173 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR) 174 features |= XFS_FEAT_NEEDSREPAIR; 175 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NREXT64) 176 features |= XFS_FEAT_NREXT64; 177 178 return features; 179 } 180 181 /* Check all the superblock fields we care about when reading one in. */ 182 STATIC int 183 xfs_validate_sb_read( 184 struct xfs_mount *mp, 185 struct xfs_sb *sbp) 186 { 187 if (!xfs_sb_is_v5(sbp)) 188 return 0; 189 190 /* 191 * Version 5 superblock feature mask validation. Reject combinations 192 * the kernel cannot support up front before checking anything else. 193 */ 194 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) { 195 xfs_warn(mp, 196 "Superblock has unknown compatible features (0x%x) enabled.", 197 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN)); 198 xfs_warn(mp, 199 "Using a more recent kernel is recommended."); 200 } 201 202 if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 203 xfs_alert(mp, 204 "Superblock has unknown read-only compatible features (0x%x) enabled.", 205 (sbp->sb_features_ro_compat & 206 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 207 if (!xfs_is_readonly(mp)) { 208 xfs_warn(mp, 209 "Attempted to mount read-only compatible filesystem read-write."); 210 xfs_warn(mp, 211 "Filesystem can only be safely mounted read only."); 212 213 return -EINVAL; 214 } 215 } 216 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 217 xfs_warn(mp, 218 "Superblock has unknown incompatible features (0x%x) enabled.", 219 (sbp->sb_features_incompat & 220 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 221 xfs_warn(mp, 222 "Filesystem cannot be safely mounted by this kernel."); 223 return -EINVAL; 224 } 225 226 return 0; 227 } 228 229 /* Check all the superblock fields we care about when writing one out. */ 230 STATIC int 231 xfs_validate_sb_write( 232 struct xfs_mount *mp, 233 struct xfs_buf *bp, 234 struct xfs_sb *sbp) 235 { 236 /* 237 * Carry out additional sb summary counter sanity checks when we write 238 * the superblock. We skip this in the read validator because there 239 * could be newer superblocks in the log and if the values are garbage 240 * even after replay we'll recalculate them at the end of log mount. 241 * 242 * mkfs has traditionally written zeroed counters to inprogress and 243 * secondary superblocks, so allow this usage to continue because 244 * we never read counters from such superblocks. 245 */ 246 if (xfs_buf_daddr(bp) == XFS_SB_DADDR && !sbp->sb_inprogress && 247 (sbp->sb_fdblocks > sbp->sb_dblocks || 248 !xfs_verify_icount(mp, sbp->sb_icount) || 249 sbp->sb_ifree > sbp->sb_icount)) { 250 xfs_warn(mp, "SB summary counter sanity check failed"); 251 return -EFSCORRUPTED; 252 } 253 254 if (!xfs_sb_is_v5(sbp)) 255 return 0; 256 257 /* 258 * Version 5 superblock feature mask validation. Reject combinations 259 * the kernel cannot support since we checked for unsupported bits in 260 * the read verifier, which means that memory is corrupt. 261 */ 262 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) { 263 xfs_warn(mp, 264 "Corruption detected in superblock compatible features (0x%x)!", 265 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN)); 266 return -EFSCORRUPTED; 267 } 268 269 if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 270 xfs_alert(mp, 271 "Corruption detected in superblock read-only compatible features (0x%x)!", 272 (sbp->sb_features_ro_compat & 273 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 274 return -EFSCORRUPTED; 275 } 276 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 277 xfs_warn(mp, 278 "Corruption detected in superblock incompatible features (0x%x)!", 279 (sbp->sb_features_incompat & 280 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 281 return -EFSCORRUPTED; 282 } 283 if (xfs_sb_has_incompat_log_feature(sbp, 284 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) { 285 xfs_warn(mp, 286 "Corruption detected in superblock incompatible log features (0x%x)!", 287 (sbp->sb_features_log_incompat & 288 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)); 289 return -EFSCORRUPTED; 290 } 291 292 /* 293 * We can't read verify the sb LSN because the read verifier is called 294 * before the log is allocated and processed. We know the log is set up 295 * before write verifier calls, so check it here. 296 */ 297 if (!xfs_log_check_lsn(mp, sbp->sb_lsn)) 298 return -EFSCORRUPTED; 299 300 return 0; 301 } 302 303 /* Check the validity of the SB. */ 304 STATIC int 305 xfs_validate_sb_common( 306 struct xfs_mount *mp, 307 struct xfs_buf *bp, 308 struct xfs_sb *sbp) 309 { 310 struct xfs_dsb *dsb = bp->b_addr; 311 uint32_t agcount = 0; 312 uint32_t rem; 313 bool has_dalign; 314 315 if (!xfs_verify_magic(bp, dsb->sb_magicnum)) { 316 xfs_warn(mp, 317 "Superblock has bad magic number 0x%x. Not an XFS filesystem?", 318 be32_to_cpu(dsb->sb_magicnum)); 319 return -EWRONGFS; 320 } 321 322 if (!xfs_sb_good_version(sbp)) { 323 xfs_warn(mp, 324 "Superblock has unknown features enabled or corrupted feature masks."); 325 return -EWRONGFS; 326 } 327 328 /* 329 * Validate feature flags and state 330 */ 331 if (xfs_sb_is_v5(sbp)) { 332 if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) { 333 xfs_notice(mp, 334 "Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)", 335 sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE); 336 return -EFSCORRUPTED; 337 } 338 339 /* V5 has a separate project quota inode */ 340 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { 341 xfs_notice(mp, 342 "Version 5 of Super block has XFS_OQUOTA bits."); 343 return -EFSCORRUPTED; 344 } 345 346 /* 347 * Full inode chunks must be aligned to inode chunk size when 348 * sparse inodes are enabled to support the sparse chunk 349 * allocation algorithm and prevent overlapping inode records. 350 */ 351 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) { 352 uint32_t align; 353 354 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize 355 >> sbp->sb_blocklog; 356 if (sbp->sb_inoalignmt != align) { 357 xfs_warn(mp, 358 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.", 359 sbp->sb_inoalignmt, align); 360 return -EINVAL; 361 } 362 } 363 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | 364 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { 365 xfs_notice(mp, 366 "Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits."); 367 return -EFSCORRUPTED; 368 } 369 370 if (unlikely( 371 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 372 xfs_warn(mp, 373 "filesystem is marked as having an external log; " 374 "specify logdev on the mount command line."); 375 return -EINVAL; 376 } 377 378 if (unlikely( 379 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 380 xfs_warn(mp, 381 "filesystem is marked as having an internal log; " 382 "do not specify logdev on the mount command line."); 383 return -EINVAL; 384 } 385 386 /* Compute agcount for this number of dblocks and agblocks */ 387 if (sbp->sb_agblocks) { 388 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem); 389 if (rem) 390 agcount++; 391 } 392 393 /* 394 * More sanity checking. Most of these were stolen directly from 395 * xfs_repair. 396 */ 397 if (unlikely( 398 sbp->sb_agcount <= 0 || 399 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 400 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 401 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 402 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 403 sbp->sb_sectsize != (1 << sbp->sb_sectlog) || 404 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 405 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 406 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 407 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 408 sbp->sb_blocksize != (1 << sbp->sb_blocklog) || 409 sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 410 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 411 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 412 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 413 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 414 sbp->sb_inodesize != (1 << sbp->sb_inodelog) || 415 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || 416 XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES || 417 XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES || 418 sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 || 419 agcount == 0 || agcount != sbp->sb_agcount || 420 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 421 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 422 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 423 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || 424 sbp->sb_dblocks == 0 || 425 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || 426 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || 427 sbp->sb_shared_vn != 0)) { 428 xfs_notice(mp, "SB sanity check failed"); 429 return -EFSCORRUPTED; 430 } 431 432 /* 433 * Logs that are too large are not supported at all. Reject them 434 * outright. Logs that are too small are tolerated on v4 filesystems, 435 * but we can only check that when mounting the log. Hence we skip 436 * those checks here. 437 */ 438 if (sbp->sb_logblocks > XFS_MAX_LOG_BLOCKS) { 439 xfs_notice(mp, 440 "Log size 0x%x blocks too large, maximum size is 0x%llx blocks", 441 sbp->sb_logblocks, XFS_MAX_LOG_BLOCKS); 442 return -EFSCORRUPTED; 443 } 444 445 if (XFS_FSB_TO_B(mp, sbp->sb_logblocks) > XFS_MAX_LOG_BYTES) { 446 xfs_warn(mp, 447 "log size 0x%llx bytes too large, maximum size is 0x%llx bytes", 448 XFS_FSB_TO_B(mp, sbp->sb_logblocks), 449 XFS_MAX_LOG_BYTES); 450 return -EFSCORRUPTED; 451 } 452 453 /* 454 * Do not allow filesystems with corrupted log sector or stripe units to 455 * be mounted. We cannot safely size the iclogs or write to the log if 456 * the log stripe unit is not valid. 457 */ 458 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) { 459 if (sbp->sb_logsectsize != (1U << sbp->sb_logsectlog)) { 460 xfs_notice(mp, 461 "log sector size in bytes/log2 (0x%x/0x%x) must match", 462 sbp->sb_logsectsize, 1U << sbp->sb_logsectlog); 463 return -EFSCORRUPTED; 464 } 465 } else if (sbp->sb_logsectsize || sbp->sb_logsectlog) { 466 xfs_notice(mp, 467 "log sector size in bytes/log2 (0x%x/0x%x) are not zero", 468 sbp->sb_logsectsize, sbp->sb_logsectlog); 469 return -EFSCORRUPTED; 470 } 471 472 if (sbp->sb_logsunit > 1) { 473 if (sbp->sb_logsunit % sbp->sb_blocksize) { 474 xfs_notice(mp, 475 "log stripe unit 0x%x bytes must be a multiple of block size", 476 sbp->sb_logsunit); 477 return -EFSCORRUPTED; 478 } 479 if (sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE) { 480 xfs_notice(mp, 481 "log stripe unit 0x%x bytes over maximum size (0x%x bytes)", 482 sbp->sb_logsunit, XLOG_MAX_RECORD_BSIZE); 483 return -EFSCORRUPTED; 484 } 485 } 486 487 /* Validate the realtime geometry; stolen from xfs_repair */ 488 if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE || 489 sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) { 490 xfs_notice(mp, 491 "realtime extent sanity check failed"); 492 return -EFSCORRUPTED; 493 } 494 495 if (sbp->sb_rblocks == 0) { 496 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 || 497 sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) { 498 xfs_notice(mp, 499 "realtime zeroed geometry check failed"); 500 return -EFSCORRUPTED; 501 } 502 } else { 503 uint64_t rexts; 504 uint64_t rbmblocks; 505 506 rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize); 507 rbmblocks = howmany_64(sbp->sb_rextents, 508 NBBY * sbp->sb_blocksize); 509 510 if (sbp->sb_rextents != rexts || 511 sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) || 512 sbp->sb_rbmblocks != rbmblocks) { 513 xfs_notice(mp, 514 "realtime geometry sanity check failed"); 515 return -EFSCORRUPTED; 516 } 517 } 518 519 /* 520 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign) 521 * would imply the image is corrupted. 522 */ 523 has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT; 524 if (!!sbp->sb_unit ^ has_dalign) { 525 xfs_notice(mp, "SB stripe alignment sanity check failed"); 526 return -EFSCORRUPTED; 527 } 528 529 if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit), 530 XFS_FSB_TO_B(mp, sbp->sb_width), 0, false)) 531 return -EFSCORRUPTED; 532 533 /* 534 * Currently only very few inode sizes are supported. 535 */ 536 switch (sbp->sb_inodesize) { 537 case 256: 538 case 512: 539 case 1024: 540 case 2048: 541 break; 542 default: 543 xfs_warn(mp, "inode size of %d bytes not supported", 544 sbp->sb_inodesize); 545 return -ENOSYS; 546 } 547 548 return 0; 549 } 550 551 void 552 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 553 { 554 /* 555 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 556 * leads to in-core values having two different values for a quota 557 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 558 * NULLFSINO. 559 * 560 * Note that this change affect only the in-core values. These 561 * values are not written back to disk unless any quota information 562 * is written to the disk. Even in that case, sb_pquotino field is 563 * not written to disk unless the superblock supports pquotino. 564 */ 565 if (sbp->sb_uquotino == 0) 566 sbp->sb_uquotino = NULLFSINO; 567 if (sbp->sb_gquotino == 0) 568 sbp->sb_gquotino = NULLFSINO; 569 if (sbp->sb_pquotino == 0) 570 sbp->sb_pquotino = NULLFSINO; 571 572 /* 573 * We need to do these manipilations only if we are working 574 * with an older version of on-disk superblock. 575 */ 576 if (xfs_sb_is_v5(sbp)) 577 return; 578 579 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 580 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 581 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 582 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 583 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 584 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 585 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 586 587 if (sbp->sb_qflags & XFS_PQUOTA_ACCT && 588 sbp->sb_gquotino != NULLFSINO) { 589 /* 590 * In older version of superblock, on-disk superblock only 591 * has sb_gquotino, and in-core superblock has both sb_gquotino 592 * and sb_pquotino. But, only one of them is supported at any 593 * point of time. So, if PQUOTA is set in disk superblock, 594 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test 595 * above is to make sure we don't do this twice and wipe them 596 * both out! 597 */ 598 sbp->sb_pquotino = sbp->sb_gquotino; 599 sbp->sb_gquotino = NULLFSINO; 600 } 601 } 602 603 static void 604 __xfs_sb_from_disk( 605 struct xfs_sb *to, 606 struct xfs_dsb *from, 607 bool convert_xquota) 608 { 609 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 610 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 611 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 612 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 613 to->sb_rextents = be64_to_cpu(from->sb_rextents); 614 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 615 to->sb_logstart = be64_to_cpu(from->sb_logstart); 616 to->sb_rootino = be64_to_cpu(from->sb_rootino); 617 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 618 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 619 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 620 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 621 to->sb_agcount = be32_to_cpu(from->sb_agcount); 622 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 623 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 624 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 625 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 626 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 627 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 628 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 629 to->sb_blocklog = from->sb_blocklog; 630 to->sb_sectlog = from->sb_sectlog; 631 to->sb_inodelog = from->sb_inodelog; 632 to->sb_inopblog = from->sb_inopblog; 633 to->sb_agblklog = from->sb_agblklog; 634 to->sb_rextslog = from->sb_rextslog; 635 to->sb_inprogress = from->sb_inprogress; 636 to->sb_imax_pct = from->sb_imax_pct; 637 to->sb_icount = be64_to_cpu(from->sb_icount); 638 to->sb_ifree = be64_to_cpu(from->sb_ifree); 639 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 640 to->sb_frextents = be64_to_cpu(from->sb_frextents); 641 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 642 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 643 to->sb_qflags = be16_to_cpu(from->sb_qflags); 644 to->sb_flags = from->sb_flags; 645 to->sb_shared_vn = from->sb_shared_vn; 646 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 647 to->sb_unit = be32_to_cpu(from->sb_unit); 648 to->sb_width = be32_to_cpu(from->sb_width); 649 to->sb_dirblklog = from->sb_dirblklog; 650 to->sb_logsectlog = from->sb_logsectlog; 651 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 652 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 653 to->sb_features2 = be32_to_cpu(from->sb_features2); 654 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 655 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 656 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 657 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 658 to->sb_features_log_incompat = 659 be32_to_cpu(from->sb_features_log_incompat); 660 /* crc is only used on disk, not in memory; just init to 0 here. */ 661 to->sb_crc = 0; 662 to->sb_spino_align = be32_to_cpu(from->sb_spino_align); 663 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 664 to->sb_lsn = be64_to_cpu(from->sb_lsn); 665 /* 666 * sb_meta_uuid is only on disk if it differs from sb_uuid and the 667 * feature flag is set; if not set we keep it only in memory. 668 */ 669 if (xfs_sb_is_v5(to) && 670 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)) 671 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 672 else 673 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); 674 /* Convert on-disk flags to in-memory flags? */ 675 if (convert_xquota) 676 xfs_sb_quota_from_disk(to); 677 } 678 679 void 680 xfs_sb_from_disk( 681 struct xfs_sb *to, 682 struct xfs_dsb *from) 683 { 684 __xfs_sb_from_disk(to, from, true); 685 } 686 687 static void 688 xfs_sb_quota_to_disk( 689 struct xfs_dsb *to, 690 struct xfs_sb *from) 691 { 692 uint16_t qflags = from->sb_qflags; 693 694 to->sb_uquotino = cpu_to_be64(from->sb_uquotino); 695 696 /* 697 * The in-memory superblock quota state matches the v5 on-disk format so 698 * just write them out and return 699 */ 700 if (xfs_sb_is_v5(from)) { 701 to->sb_qflags = cpu_to_be16(from->sb_qflags); 702 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 703 to->sb_pquotino = cpu_to_be64(from->sb_pquotino); 704 return; 705 } 706 707 /* 708 * For older superblocks (v4), the in-core version of sb_qflags do not 709 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So, 710 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. 711 */ 712 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 713 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 714 715 if (from->sb_qflags & 716 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 717 qflags |= XFS_OQUOTA_ENFD; 718 if (from->sb_qflags & 719 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 720 qflags |= XFS_OQUOTA_CHKD; 721 to->sb_qflags = cpu_to_be16(qflags); 722 723 /* 724 * GQUOTINO and PQUOTINO cannot be used together in versions 725 * of superblock that do not have pquotino. from->sb_flags 726 * tells us which quota is active and should be copied to 727 * disk. If neither are active, we should NULL the inode. 728 * 729 * In all cases, the separate pquotino must remain 0 because it 730 * is beyond the "end" of the valid non-pquotino superblock. 731 */ 732 if (from->sb_qflags & XFS_GQUOTA_ACCT) 733 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 734 else if (from->sb_qflags & XFS_PQUOTA_ACCT) 735 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 736 else { 737 /* 738 * We can't rely on just the fields being logged to tell us 739 * that it is safe to write NULLFSINO - we should only do that 740 * if quotas are not actually enabled. Hence only write 741 * NULLFSINO if both in-core quota inodes are NULL. 742 */ 743 if (from->sb_gquotino == NULLFSINO && 744 from->sb_pquotino == NULLFSINO) 745 to->sb_gquotino = cpu_to_be64(NULLFSINO); 746 } 747 748 to->sb_pquotino = 0; 749 } 750 751 void 752 xfs_sb_to_disk( 753 struct xfs_dsb *to, 754 struct xfs_sb *from) 755 { 756 xfs_sb_quota_to_disk(to, from); 757 758 to->sb_magicnum = cpu_to_be32(from->sb_magicnum); 759 to->sb_blocksize = cpu_to_be32(from->sb_blocksize); 760 to->sb_dblocks = cpu_to_be64(from->sb_dblocks); 761 to->sb_rblocks = cpu_to_be64(from->sb_rblocks); 762 to->sb_rextents = cpu_to_be64(from->sb_rextents); 763 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 764 to->sb_logstart = cpu_to_be64(from->sb_logstart); 765 to->sb_rootino = cpu_to_be64(from->sb_rootino); 766 to->sb_rbmino = cpu_to_be64(from->sb_rbmino); 767 to->sb_rsumino = cpu_to_be64(from->sb_rsumino); 768 to->sb_rextsize = cpu_to_be32(from->sb_rextsize); 769 to->sb_agblocks = cpu_to_be32(from->sb_agblocks); 770 to->sb_agcount = cpu_to_be32(from->sb_agcount); 771 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); 772 to->sb_logblocks = cpu_to_be32(from->sb_logblocks); 773 to->sb_versionnum = cpu_to_be16(from->sb_versionnum); 774 to->sb_sectsize = cpu_to_be16(from->sb_sectsize); 775 to->sb_inodesize = cpu_to_be16(from->sb_inodesize); 776 to->sb_inopblock = cpu_to_be16(from->sb_inopblock); 777 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 778 to->sb_blocklog = from->sb_blocklog; 779 to->sb_sectlog = from->sb_sectlog; 780 to->sb_inodelog = from->sb_inodelog; 781 to->sb_inopblog = from->sb_inopblog; 782 to->sb_agblklog = from->sb_agblklog; 783 to->sb_rextslog = from->sb_rextslog; 784 to->sb_inprogress = from->sb_inprogress; 785 to->sb_imax_pct = from->sb_imax_pct; 786 to->sb_icount = cpu_to_be64(from->sb_icount); 787 to->sb_ifree = cpu_to_be64(from->sb_ifree); 788 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); 789 to->sb_frextents = cpu_to_be64(from->sb_frextents); 790 791 to->sb_flags = from->sb_flags; 792 to->sb_shared_vn = from->sb_shared_vn; 793 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); 794 to->sb_unit = cpu_to_be32(from->sb_unit); 795 to->sb_width = cpu_to_be32(from->sb_width); 796 to->sb_dirblklog = from->sb_dirblklog; 797 to->sb_logsectlog = from->sb_logsectlog; 798 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); 799 to->sb_logsunit = cpu_to_be32(from->sb_logsunit); 800 801 /* 802 * We need to ensure that bad_features2 always matches features2. 803 * Hence we enforce that here rather than having to remember to do it 804 * everywhere else that updates features2. 805 */ 806 from->sb_bad_features2 = from->sb_features2; 807 to->sb_features2 = cpu_to_be32(from->sb_features2); 808 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); 809 810 if (!xfs_sb_is_v5(from)) 811 return; 812 813 to->sb_features_compat = cpu_to_be32(from->sb_features_compat); 814 to->sb_features_ro_compat = 815 cpu_to_be32(from->sb_features_ro_compat); 816 to->sb_features_incompat = 817 cpu_to_be32(from->sb_features_incompat); 818 to->sb_features_log_incompat = 819 cpu_to_be32(from->sb_features_log_incompat); 820 to->sb_spino_align = cpu_to_be32(from->sb_spino_align); 821 to->sb_lsn = cpu_to_be64(from->sb_lsn); 822 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 823 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 824 } 825 826 /* 827 * If the superblock has the CRC feature bit set or the CRC field is non-null, 828 * check that the CRC is valid. We check the CRC field is non-null because a 829 * single bit error could clear the feature bit and unused parts of the 830 * superblock are supposed to be zero. Hence a non-null crc field indicates that 831 * we've potentially lost a feature bit and we should check it anyway. 832 * 833 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 834 * last field in V4 secondary superblocks. So for secondary superblocks, 835 * we are more forgiving, and ignore CRC failures if the primary doesn't 836 * indicate that the fs version is V5. 837 */ 838 static void 839 xfs_sb_read_verify( 840 struct xfs_buf *bp) 841 { 842 struct xfs_sb sb; 843 struct xfs_mount *mp = bp->b_mount; 844 struct xfs_dsb *dsb = bp->b_addr; 845 int error; 846 847 /* 848 * open code the version check to avoid needing to convert the entire 849 * superblock from disk order just to check the version number 850 */ 851 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 852 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 853 XFS_SB_VERSION_5) || 854 dsb->sb_crc != 0)) { 855 856 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 857 /* Only fail bad secondaries on a known V5 filesystem */ 858 if (xfs_buf_daddr(bp) == XFS_SB_DADDR || 859 xfs_has_crc(mp)) { 860 error = -EFSBADCRC; 861 goto out_error; 862 } 863 } 864 } 865 866 /* 867 * Check all the superblock fields. Don't byteswap the xquota flags 868 * because _verify_common checks the on-disk values. 869 */ 870 __xfs_sb_from_disk(&sb, dsb, false); 871 error = xfs_validate_sb_common(mp, bp, &sb); 872 if (error) 873 goto out_error; 874 error = xfs_validate_sb_read(mp, &sb); 875 876 out_error: 877 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 878 xfs_verifier_error(bp, error, __this_address); 879 else if (error) 880 xfs_buf_ioerror(bp, error); 881 } 882 883 /* 884 * We may be probed for a filesystem match, so we may not want to emit 885 * messages when the superblock buffer is not actually an XFS superblock. 886 * If we find an XFS superblock, then run a normal, noisy mount because we are 887 * really going to mount it and want to know about errors. 888 */ 889 static void 890 xfs_sb_quiet_read_verify( 891 struct xfs_buf *bp) 892 { 893 struct xfs_dsb *dsb = bp->b_addr; 894 895 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 896 /* XFS filesystem, verify noisily! */ 897 xfs_sb_read_verify(bp); 898 return; 899 } 900 /* quietly fail */ 901 xfs_buf_ioerror(bp, -EWRONGFS); 902 } 903 904 static void 905 xfs_sb_write_verify( 906 struct xfs_buf *bp) 907 { 908 struct xfs_sb sb; 909 struct xfs_mount *mp = bp->b_mount; 910 struct xfs_buf_log_item *bip = bp->b_log_item; 911 struct xfs_dsb *dsb = bp->b_addr; 912 int error; 913 914 /* 915 * Check all the superblock fields. Don't byteswap the xquota flags 916 * because _verify_common checks the on-disk values. 917 */ 918 __xfs_sb_from_disk(&sb, dsb, false); 919 error = xfs_validate_sb_common(mp, bp, &sb); 920 if (error) 921 goto out_error; 922 error = xfs_validate_sb_write(mp, bp, &sb); 923 if (error) 924 goto out_error; 925 926 if (!xfs_sb_is_v5(&sb)) 927 return; 928 929 if (bip) 930 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 931 932 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 933 return; 934 935 out_error: 936 xfs_verifier_error(bp, error, __this_address); 937 } 938 939 const struct xfs_buf_ops xfs_sb_buf_ops = { 940 .name = "xfs_sb", 941 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 942 .verify_read = xfs_sb_read_verify, 943 .verify_write = xfs_sb_write_verify, 944 }; 945 946 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 947 .name = "xfs_sb_quiet", 948 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 949 .verify_read = xfs_sb_quiet_read_verify, 950 .verify_write = xfs_sb_write_verify, 951 }; 952 953 /* 954 * xfs_mount_common 955 * 956 * Mount initialization code establishing various mount 957 * fields from the superblock associated with the given 958 * mount structure. 959 * 960 * Inode geometry are calculated in xfs_ialloc_setup_geometry. 961 */ 962 void 963 xfs_sb_mount_common( 964 struct xfs_mount *mp, 965 struct xfs_sb *sbp) 966 { 967 mp->m_agfrotor = 0; 968 atomic_set(&mp->m_agirotor, 0); 969 mp->m_maxagi = mp->m_sb.sb_agcount; 970 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 971 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 972 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 973 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 974 mp->m_blockmask = sbp->sb_blocksize - 1; 975 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 976 mp->m_blockwmask = mp->m_blockwsize - 1; 977 978 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 979 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 980 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 981 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 982 983 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 984 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 985 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 986 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 987 988 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1); 989 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0); 990 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; 991 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; 992 993 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true); 994 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false); 995 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; 996 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; 997 998 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 999 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 1000 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp); 1001 } 1002 1003 /* 1004 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock 1005 * into the superblock buffer to be logged. It does not provide the higher 1006 * level of locking that is needed to protect the in-core superblock from 1007 * concurrent access. 1008 */ 1009 void 1010 xfs_log_sb( 1011 struct xfs_trans *tp) 1012 { 1013 struct xfs_mount *mp = tp->t_mountp; 1014 struct xfs_buf *bp = xfs_trans_getsb(tp); 1015 1016 /* 1017 * Lazy sb counters don't update the in-core superblock so do that now. 1018 * If this is at unmount, the counters will be exactly correct, but at 1019 * any other time they will only be ballpark correct because of 1020 * reservations that have been taken out percpu counters. If we have an 1021 * unclean shutdown, this will be corrected by log recovery rebuilding 1022 * the counters from the AGF block counts. 1023 * 1024 * Do not update sb_frextents here because it is not part of the lazy 1025 * sb counters, despite having a percpu counter. It is always kept 1026 * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas() 1027 * and hence we don't need have to update it here. 1028 */ 1029 if (xfs_has_lazysbcount(mp)) { 1030 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); 1031 mp->m_sb.sb_ifree = min_t(uint64_t, 1032 percpu_counter_sum(&mp->m_ifree), 1033 mp->m_sb.sb_icount); 1034 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); 1035 } 1036 1037 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1038 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 1039 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1); 1040 } 1041 1042 /* 1043 * xfs_sync_sb 1044 * 1045 * Sync the superblock to disk. 1046 * 1047 * Note that the caller is responsible for checking the frozen state of the 1048 * filesystem. This procedure uses the non-blocking transaction allocator and 1049 * thus will allow modifications to a frozen fs. This is required because this 1050 * code can be called during the process of freezing where use of the high-level 1051 * allocator would deadlock. 1052 */ 1053 int 1054 xfs_sync_sb( 1055 struct xfs_mount *mp, 1056 bool wait) 1057 { 1058 struct xfs_trans *tp; 1059 int error; 1060 1061 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 1062 XFS_TRANS_NO_WRITECOUNT, &tp); 1063 if (error) 1064 return error; 1065 1066 xfs_log_sb(tp); 1067 if (wait) 1068 xfs_trans_set_sync(tp); 1069 return xfs_trans_commit(tp); 1070 } 1071 1072 /* 1073 * Update all the secondary superblocks to match the new state of the primary. 1074 * Because we are completely overwriting all the existing fields in the 1075 * secondary superblock buffers, there is no need to read them in from disk. 1076 * Just get a new buffer, stamp it and write it. 1077 * 1078 * The sb buffers need to be cached here so that we serialise against other 1079 * operations that access the secondary superblocks, but we don't want to keep 1080 * them in memory once it is written so we mark it as a one-shot buffer. 1081 */ 1082 int 1083 xfs_update_secondary_sbs( 1084 struct xfs_mount *mp) 1085 { 1086 struct xfs_perag *pag; 1087 xfs_agnumber_t agno = 1; 1088 int saved_error = 0; 1089 int error = 0; 1090 LIST_HEAD (buffer_list); 1091 1092 /* update secondary superblocks. */ 1093 for_each_perag_from(mp, agno, pag) { 1094 struct xfs_buf *bp; 1095 1096 error = xfs_buf_get(mp->m_ddev_targp, 1097 XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR), 1098 XFS_FSS_TO_BB(mp, 1), &bp); 1099 /* 1100 * If we get an error reading or writing alternate superblocks, 1101 * continue. xfs_repair chooses the "best" superblock based 1102 * on most matches; if we break early, we'll leave more 1103 * superblocks un-updated than updated, and xfs_repair may 1104 * pick them over the properly-updated primary. 1105 */ 1106 if (error) { 1107 xfs_warn(mp, 1108 "error allocating secondary superblock for ag %d", 1109 pag->pag_agno); 1110 if (!saved_error) 1111 saved_error = error; 1112 continue; 1113 } 1114 1115 bp->b_ops = &xfs_sb_buf_ops; 1116 xfs_buf_oneshot(bp); 1117 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 1118 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1119 xfs_buf_delwri_queue(bp, &buffer_list); 1120 xfs_buf_relse(bp); 1121 1122 /* don't hold too many buffers at once */ 1123 if (agno % 16) 1124 continue; 1125 1126 error = xfs_buf_delwri_submit(&buffer_list); 1127 if (error) { 1128 xfs_warn(mp, 1129 "write error %d updating a secondary superblock near ag %d", 1130 error, pag->pag_agno); 1131 if (!saved_error) 1132 saved_error = error; 1133 continue; 1134 } 1135 } 1136 error = xfs_buf_delwri_submit(&buffer_list); 1137 if (error) { 1138 xfs_warn(mp, 1139 "write error %d updating a secondary superblock near ag %d", 1140 error, agno); 1141 } 1142 1143 return saved_error ? saved_error : error; 1144 } 1145 1146 /* 1147 * Same behavior as xfs_sync_sb, except that it is always synchronous and it 1148 * also writes the superblock buffer to disk sector 0 immediately. 1149 */ 1150 int 1151 xfs_sync_sb_buf( 1152 struct xfs_mount *mp) 1153 { 1154 struct xfs_trans *tp; 1155 struct xfs_buf *bp; 1156 int error; 1157 1158 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp); 1159 if (error) 1160 return error; 1161 1162 bp = xfs_trans_getsb(tp); 1163 xfs_log_sb(tp); 1164 xfs_trans_bhold(tp, bp); 1165 xfs_trans_set_sync(tp); 1166 error = xfs_trans_commit(tp); 1167 if (error) 1168 goto out; 1169 /* 1170 * write out the sb buffer to get the changes to disk 1171 */ 1172 error = xfs_bwrite(bp); 1173 out: 1174 xfs_buf_relse(bp); 1175 return error; 1176 } 1177 1178 void 1179 xfs_fs_geometry( 1180 struct xfs_mount *mp, 1181 struct xfs_fsop_geom *geo, 1182 int struct_version) 1183 { 1184 struct xfs_sb *sbp = &mp->m_sb; 1185 1186 memset(geo, 0, sizeof(struct xfs_fsop_geom)); 1187 1188 geo->blocksize = sbp->sb_blocksize; 1189 geo->rtextsize = sbp->sb_rextsize; 1190 geo->agblocks = sbp->sb_agblocks; 1191 geo->agcount = sbp->sb_agcount; 1192 geo->logblocks = sbp->sb_logblocks; 1193 geo->sectsize = sbp->sb_sectsize; 1194 geo->inodesize = sbp->sb_inodesize; 1195 geo->imaxpct = sbp->sb_imax_pct; 1196 geo->datablocks = sbp->sb_dblocks; 1197 geo->rtblocks = sbp->sb_rblocks; 1198 geo->rtextents = sbp->sb_rextents; 1199 geo->logstart = sbp->sb_logstart; 1200 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid)); 1201 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid)); 1202 1203 if (struct_version < 2) 1204 return; 1205 1206 geo->sunit = sbp->sb_unit; 1207 geo->swidth = sbp->sb_width; 1208 1209 if (struct_version < 3) 1210 return; 1211 1212 geo->version = XFS_FSOP_GEOM_VERSION; 1213 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 1214 XFS_FSOP_GEOM_FLAGS_DIRV2 | 1215 XFS_FSOP_GEOM_FLAGS_EXTFLG; 1216 if (xfs_has_attr(mp)) 1217 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR; 1218 if (xfs_has_quota(mp)) 1219 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA; 1220 if (xfs_has_align(mp)) 1221 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN; 1222 if (xfs_has_dalign(mp)) 1223 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN; 1224 if (xfs_has_asciici(mp)) 1225 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI; 1226 if (xfs_has_lazysbcount(mp)) 1227 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB; 1228 if (xfs_has_attr2(mp)) 1229 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2; 1230 if (xfs_has_projid32(mp)) 1231 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32; 1232 if (xfs_has_crc(mp)) 1233 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB; 1234 if (xfs_has_ftype(mp)) 1235 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE; 1236 if (xfs_has_finobt(mp)) 1237 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT; 1238 if (xfs_has_sparseinodes(mp)) 1239 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES; 1240 if (xfs_has_rmapbt(mp)) 1241 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT; 1242 if (xfs_has_reflink(mp)) 1243 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK; 1244 if (xfs_has_bigtime(mp)) 1245 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME; 1246 if (xfs_has_inobtcounts(mp)) 1247 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT; 1248 if (xfs_has_sector(mp)) { 1249 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR; 1250 geo->logsectsize = sbp->sb_logsectsize; 1251 } else { 1252 geo->logsectsize = BBSIZE; 1253 } 1254 if (xfs_has_large_extent_counts(mp)) 1255 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64; 1256 geo->rtsectsize = sbp->sb_blocksize; 1257 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp); 1258 1259 if (struct_version < 4) 1260 return; 1261 1262 if (xfs_has_logv2(mp)) 1263 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2; 1264 1265 geo->logsunit = sbp->sb_logsunit; 1266 1267 if (struct_version < 5) 1268 return; 1269 1270 geo->version = XFS_FSOP_GEOM_VERSION_V5; 1271 } 1272 1273 /* Read a secondary superblock. */ 1274 int 1275 xfs_sb_read_secondary( 1276 struct xfs_mount *mp, 1277 struct xfs_trans *tp, 1278 xfs_agnumber_t agno, 1279 struct xfs_buf **bpp) 1280 { 1281 struct xfs_buf *bp; 1282 int error; 1283 1284 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1285 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, 1286 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1287 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops); 1288 if (error) 1289 return error; 1290 xfs_buf_set_ref(bp, XFS_SSB_REF); 1291 *bpp = bp; 1292 return 0; 1293 } 1294 1295 /* Get an uninitialised secondary superblock buffer. */ 1296 int 1297 xfs_sb_get_secondary( 1298 struct xfs_mount *mp, 1299 struct xfs_trans *tp, 1300 xfs_agnumber_t agno, 1301 struct xfs_buf **bpp) 1302 { 1303 struct xfs_buf *bp; 1304 int error; 1305 1306 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1307 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, 1308 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1309 XFS_FSS_TO_BB(mp, 1), 0, &bp); 1310 if (error) 1311 return error; 1312 bp->b_ops = &xfs_sb_buf_ops; 1313 xfs_buf_oneshot(bp); 1314 *bpp = bp; 1315 return 0; 1316 } 1317 1318 /* 1319 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, 1320 * so users won't be confused by values in error messages. 1321 */ 1322 bool 1323 xfs_validate_stripe_geometry( 1324 struct xfs_mount *mp, 1325 __s64 sunit, 1326 __s64 swidth, 1327 int sectorsize, 1328 bool silent) 1329 { 1330 if (swidth > INT_MAX) { 1331 if (!silent) 1332 xfs_notice(mp, 1333 "stripe width (%lld) is too large", swidth); 1334 return false; 1335 } 1336 1337 if (sunit > swidth) { 1338 if (!silent) 1339 xfs_notice(mp, 1340 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth); 1341 return false; 1342 } 1343 1344 if (sectorsize && (int)sunit % sectorsize) { 1345 if (!silent) 1346 xfs_notice(mp, 1347 "stripe unit (%lld) must be a multiple of the sector size (%d)", 1348 sunit, sectorsize); 1349 return false; 1350 } 1351 1352 if (sunit && !swidth) { 1353 if (!silent) 1354 xfs_notice(mp, 1355 "invalid stripe unit (%lld) and stripe width of 0", sunit); 1356 return false; 1357 } 1358 1359 if (!sunit && swidth) { 1360 if (!silent) 1361 xfs_notice(mp, 1362 "invalid stripe width (%lld) and stripe unit of 0", swidth); 1363 return false; 1364 } 1365 1366 if (sunit && (int)swidth % (int)sunit) { 1367 if (!silent) 1368 xfs_notice(mp, 1369 "stripe width (%lld) must be a multiple of the stripe unit (%lld)", 1370 swidth, sunit); 1371 return false; 1372 } 1373 return true; 1374 } 1375