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 #include "xfs_rtbitmap.h" 29 30 /* 31 * Physical superblock buffer manipulations. Shared with libxfs in userspace. 32 */ 33 34 /* 35 * Check that all the V4 feature bits that the V5 filesystem format requires are 36 * correctly set. 37 */ 38 static bool 39 xfs_sb_validate_v5_features( 40 struct xfs_sb *sbp) 41 { 42 /* We must not have any unknown V4 feature bits set */ 43 if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) 44 return false; 45 46 /* 47 * The CRC bit is considered an invalid V4 flag, so we have to add it 48 * manually to the OKBITS mask. 49 */ 50 if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS | 51 XFS_SB_VERSION2_CRCBIT)) 52 return false; 53 54 /* Now check all the required V4 feature flags are set. */ 55 56 #define V5_VERS_FLAGS (XFS_SB_VERSION_NLINKBIT | \ 57 XFS_SB_VERSION_ALIGNBIT | \ 58 XFS_SB_VERSION_LOGV2BIT | \ 59 XFS_SB_VERSION_EXTFLGBIT | \ 60 XFS_SB_VERSION_DIRV2BIT | \ 61 XFS_SB_VERSION_MOREBITSBIT) 62 63 #define V5_FEAT_FLAGS (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 64 XFS_SB_VERSION2_ATTR2BIT | \ 65 XFS_SB_VERSION2_PROJID32BIT | \ 66 XFS_SB_VERSION2_CRCBIT) 67 68 if ((sbp->sb_versionnum & V5_VERS_FLAGS) != V5_VERS_FLAGS) 69 return false; 70 if ((sbp->sb_features2 & V5_FEAT_FLAGS) != V5_FEAT_FLAGS) 71 return false; 72 return true; 73 } 74 75 /* 76 * We current support XFS v5 formats with known features and v4 superblocks with 77 * at least V2 directories. 78 */ 79 bool 80 xfs_sb_good_version( 81 struct xfs_sb *sbp) 82 { 83 /* 84 * All v5 filesystems are supported, but we must check that all the 85 * required v4 feature flags are enabled correctly as the code checks 86 * those flags and not for v5 support. 87 */ 88 if (xfs_sb_is_v5(sbp)) 89 return xfs_sb_validate_v5_features(sbp); 90 91 /* versions prior to v4 are not supported */ 92 if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_4) 93 return false; 94 95 /* We must not have any unknown v4 feature bits set */ 96 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 97 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 98 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 99 return false; 100 101 /* V4 filesystems need v2 directories and unwritten extents */ 102 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 103 return false; 104 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)) 105 return false; 106 107 /* It's a supported v4 filesystem */ 108 return true; 109 } 110 111 uint64_t 112 xfs_sb_version_to_features( 113 struct xfs_sb *sbp) 114 { 115 uint64_t features = 0; 116 117 /* optional V4 features */ 118 if (sbp->sb_rblocks > 0) 119 features |= XFS_FEAT_REALTIME; 120 if (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT) 121 features |= XFS_FEAT_NLINK; 122 if (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT) 123 features |= XFS_FEAT_ATTR; 124 if (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT) 125 features |= XFS_FEAT_QUOTA; 126 if (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT) 127 features |= XFS_FEAT_ALIGN; 128 if (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT) 129 features |= XFS_FEAT_LOGV2; 130 if (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT) 131 features |= XFS_FEAT_DALIGN; 132 if (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT) 133 features |= XFS_FEAT_EXTFLG; 134 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) 135 features |= XFS_FEAT_SECTOR; 136 if (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT) 137 features |= XFS_FEAT_ASCIICI; 138 if (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) { 139 if (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT) 140 features |= XFS_FEAT_LAZYSBCOUNT; 141 if (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT) 142 features |= XFS_FEAT_ATTR2; 143 if (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT) 144 features |= XFS_FEAT_PROJID32; 145 if (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE) 146 features |= XFS_FEAT_FTYPE; 147 } 148 149 if (!xfs_sb_is_v5(sbp)) 150 return features; 151 152 /* Always on V5 features */ 153 features |= XFS_FEAT_ALIGN | XFS_FEAT_LOGV2 | XFS_FEAT_EXTFLG | 154 XFS_FEAT_LAZYSBCOUNT | XFS_FEAT_ATTR2 | XFS_FEAT_PROJID32 | 155 XFS_FEAT_V3INODES | XFS_FEAT_CRC | XFS_FEAT_PQUOTINO; 156 157 /* Optional V5 features */ 158 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT) 159 features |= XFS_FEAT_FINOBT; 160 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT) 161 features |= XFS_FEAT_RMAPBT; 162 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK) 163 features |= XFS_FEAT_REFLINK; 164 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 165 features |= XFS_FEAT_INOBTCNT; 166 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE) 167 features |= XFS_FEAT_FTYPE; 168 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) 169 features |= XFS_FEAT_SPINODES; 170 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 171 features |= XFS_FEAT_META_UUID; 172 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME) 173 features |= XFS_FEAT_BIGTIME; 174 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR) 175 features |= XFS_FEAT_NEEDSREPAIR; 176 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NREXT64) 177 features |= XFS_FEAT_NREXT64; 178 179 return features; 180 } 181 182 /* Check all the superblock fields we care about when reading one in. */ 183 STATIC int 184 xfs_validate_sb_read( 185 struct xfs_mount *mp, 186 struct xfs_sb *sbp) 187 { 188 if (!xfs_sb_is_v5(sbp)) 189 return 0; 190 191 /* 192 * Version 5 superblock feature mask validation. Reject combinations 193 * the kernel cannot support up front before checking anything else. 194 */ 195 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) { 196 xfs_warn(mp, 197 "Superblock has unknown compatible features (0x%x) enabled.", 198 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN)); 199 xfs_warn(mp, 200 "Using a more recent kernel is recommended."); 201 } 202 203 if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 204 xfs_alert(mp, 205 "Superblock has unknown read-only compatible features (0x%x) enabled.", 206 (sbp->sb_features_ro_compat & 207 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 208 if (!xfs_is_readonly(mp)) { 209 xfs_warn(mp, 210 "Attempted to mount read-only compatible filesystem read-write."); 211 xfs_warn(mp, 212 "Filesystem can only be safely mounted read only."); 213 214 return -EINVAL; 215 } 216 } 217 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 218 xfs_warn(mp, 219 "Superblock has unknown incompatible features (0x%x) enabled.", 220 (sbp->sb_features_incompat & 221 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 222 xfs_warn(mp, 223 "Filesystem cannot be safely mounted by this kernel."); 224 return -EINVAL; 225 } 226 227 return 0; 228 } 229 230 /* Check all the superblock fields we care about when writing one out. */ 231 STATIC int 232 xfs_validate_sb_write( 233 struct xfs_mount *mp, 234 struct xfs_buf *bp, 235 struct xfs_sb *sbp) 236 { 237 /* 238 * Carry out additional sb summary counter sanity checks when we write 239 * the superblock. We skip this in the read validator because there 240 * could be newer superblocks in the log and if the values are garbage 241 * even after replay we'll recalculate them at the end of log mount. 242 * 243 * mkfs has traditionally written zeroed counters to inprogress and 244 * secondary superblocks, so allow this usage to continue because 245 * we never read counters from such superblocks. 246 */ 247 if (xfs_buf_daddr(bp) == XFS_SB_DADDR && !sbp->sb_inprogress && 248 (sbp->sb_fdblocks > sbp->sb_dblocks || 249 !xfs_verify_icount(mp, sbp->sb_icount) || 250 sbp->sb_ifree > sbp->sb_icount)) { 251 xfs_warn(mp, "SB summary counter sanity check failed"); 252 return -EFSCORRUPTED; 253 } 254 255 if (!xfs_sb_is_v5(sbp)) 256 return 0; 257 258 /* 259 * Version 5 superblock feature mask validation. Reject combinations 260 * the kernel cannot support since we checked for unsupported bits in 261 * the read verifier, which means that memory is corrupt. 262 */ 263 if (!xfs_is_readonly(mp) && 264 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 265 xfs_alert(mp, 266 "Corruption detected in superblock read-only compatible features (0x%x)!", 267 (sbp->sb_features_ro_compat & 268 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 269 return -EFSCORRUPTED; 270 } 271 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 272 xfs_warn(mp, 273 "Corruption detected in superblock incompatible features (0x%x)!", 274 (sbp->sb_features_incompat & 275 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 276 return -EFSCORRUPTED; 277 } 278 if (xfs_sb_has_incompat_log_feature(sbp, 279 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) { 280 xfs_warn(mp, 281 "Corruption detected in superblock incompatible log features (0x%x)!", 282 (sbp->sb_features_log_incompat & 283 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)); 284 return -EFSCORRUPTED; 285 } 286 287 /* 288 * We can't read verify the sb LSN because the read verifier is called 289 * before the log is allocated and processed. We know the log is set up 290 * before write verifier calls, so check it here. 291 */ 292 if (!xfs_log_check_lsn(mp, sbp->sb_lsn)) 293 return -EFSCORRUPTED; 294 295 return 0; 296 } 297 298 /* Check the validity of the SB. */ 299 STATIC int 300 xfs_validate_sb_common( 301 struct xfs_mount *mp, 302 struct xfs_buf *bp, 303 struct xfs_sb *sbp) 304 { 305 struct xfs_dsb *dsb = bp->b_addr; 306 uint32_t agcount = 0; 307 uint32_t rem; 308 bool has_dalign; 309 310 if (!xfs_verify_magic(bp, dsb->sb_magicnum)) { 311 xfs_warn(mp, 312 "Superblock has bad magic number 0x%x. Not an XFS filesystem?", 313 be32_to_cpu(dsb->sb_magicnum)); 314 return -EWRONGFS; 315 } 316 317 if (!xfs_sb_good_version(sbp)) { 318 xfs_warn(mp, 319 "Superblock has unknown features enabled or corrupted feature masks."); 320 return -EWRONGFS; 321 } 322 323 /* 324 * Validate feature flags and state 325 */ 326 if (xfs_sb_is_v5(sbp)) { 327 if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) { 328 xfs_notice(mp, 329 "Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)", 330 sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE); 331 return -EFSCORRUPTED; 332 } 333 334 /* V5 has a separate project quota inode */ 335 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { 336 xfs_notice(mp, 337 "Version 5 of Super block has XFS_OQUOTA bits."); 338 return -EFSCORRUPTED; 339 } 340 341 /* 342 * Full inode chunks must be aligned to inode chunk size when 343 * sparse inodes are enabled to support the sparse chunk 344 * allocation algorithm and prevent overlapping inode records. 345 */ 346 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) { 347 uint32_t align; 348 349 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize 350 >> sbp->sb_blocklog; 351 if (sbp->sb_inoalignmt != align) { 352 xfs_warn(mp, 353 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.", 354 sbp->sb_inoalignmt, align); 355 return -EINVAL; 356 } 357 } 358 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | 359 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { 360 xfs_notice(mp, 361 "Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits."); 362 return -EFSCORRUPTED; 363 } 364 365 if (unlikely( 366 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 367 xfs_warn(mp, 368 "filesystem is marked as having an external log; " 369 "specify logdev on the mount command line."); 370 return -EINVAL; 371 } 372 373 if (unlikely( 374 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 375 xfs_warn(mp, 376 "filesystem is marked as having an internal log; " 377 "do not specify logdev on the mount command line."); 378 return -EINVAL; 379 } 380 381 /* Compute agcount for this number of dblocks and agblocks */ 382 if (sbp->sb_agblocks) { 383 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem); 384 if (rem) 385 agcount++; 386 } 387 388 /* 389 * More sanity checking. Most of these were stolen directly from 390 * xfs_repair. 391 */ 392 if (unlikely( 393 sbp->sb_agcount <= 0 || 394 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 395 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 396 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 397 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 398 sbp->sb_sectsize != (1 << sbp->sb_sectlog) || 399 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 400 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 401 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 402 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 403 sbp->sb_blocksize != (1 << sbp->sb_blocklog) || 404 sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 405 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 406 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 407 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 408 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 409 sbp->sb_inodesize != (1 << sbp->sb_inodelog) || 410 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || 411 XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES || 412 XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES || 413 sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 || 414 agcount == 0 || agcount != sbp->sb_agcount || 415 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 416 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 417 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 418 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || 419 sbp->sb_dblocks == 0 || 420 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || 421 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || 422 sbp->sb_shared_vn != 0)) { 423 xfs_notice(mp, "SB sanity check failed"); 424 return -EFSCORRUPTED; 425 } 426 427 /* 428 * Logs that are too large are not supported at all. Reject them 429 * outright. Logs that are too small are tolerated on v4 filesystems, 430 * but we can only check that when mounting the log. Hence we skip 431 * those checks here. 432 */ 433 if (sbp->sb_logblocks > XFS_MAX_LOG_BLOCKS) { 434 xfs_notice(mp, 435 "Log size 0x%x blocks too large, maximum size is 0x%llx blocks", 436 sbp->sb_logblocks, XFS_MAX_LOG_BLOCKS); 437 return -EFSCORRUPTED; 438 } 439 440 if (XFS_FSB_TO_B(mp, sbp->sb_logblocks) > XFS_MAX_LOG_BYTES) { 441 xfs_warn(mp, 442 "log size 0x%llx bytes too large, maximum size is 0x%llx bytes", 443 XFS_FSB_TO_B(mp, sbp->sb_logblocks), 444 XFS_MAX_LOG_BYTES); 445 return -EFSCORRUPTED; 446 } 447 448 /* 449 * Do not allow filesystems with corrupted log sector or stripe units to 450 * be mounted. We cannot safely size the iclogs or write to the log if 451 * the log stripe unit is not valid. 452 */ 453 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) { 454 if (sbp->sb_logsectsize != (1U << sbp->sb_logsectlog)) { 455 xfs_notice(mp, 456 "log sector size in bytes/log2 (0x%x/0x%x) must match", 457 sbp->sb_logsectsize, 1U << sbp->sb_logsectlog); 458 return -EFSCORRUPTED; 459 } 460 } else if (sbp->sb_logsectsize || sbp->sb_logsectlog) { 461 xfs_notice(mp, 462 "log sector size in bytes/log2 (0x%x/0x%x) are not zero", 463 sbp->sb_logsectsize, sbp->sb_logsectlog); 464 return -EFSCORRUPTED; 465 } 466 467 if (sbp->sb_logsunit > 1) { 468 if (sbp->sb_logsunit % sbp->sb_blocksize) { 469 xfs_notice(mp, 470 "log stripe unit 0x%x bytes must be a multiple of block size", 471 sbp->sb_logsunit); 472 return -EFSCORRUPTED; 473 } 474 if (sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE) { 475 xfs_notice(mp, 476 "log stripe unit 0x%x bytes over maximum size (0x%x bytes)", 477 sbp->sb_logsunit, XLOG_MAX_RECORD_BSIZE); 478 return -EFSCORRUPTED; 479 } 480 } 481 482 /* Validate the realtime geometry; stolen from xfs_repair */ 483 if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE || 484 sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) { 485 xfs_notice(mp, 486 "realtime extent sanity check failed"); 487 return -EFSCORRUPTED; 488 } 489 490 if (sbp->sb_rblocks == 0) { 491 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 || 492 sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) { 493 xfs_notice(mp, 494 "realtime zeroed geometry check failed"); 495 return -EFSCORRUPTED; 496 } 497 } else { 498 uint64_t rexts; 499 uint64_t rbmblocks; 500 501 rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize); 502 rbmblocks = howmany_64(sbp->sb_rextents, 503 NBBY * sbp->sb_blocksize); 504 505 if (!xfs_validate_rtextents(rexts) || 506 sbp->sb_rextents != rexts || 507 sbp->sb_rextslog != xfs_compute_rextslog(rexts) || 508 sbp->sb_rbmblocks != rbmblocks) { 509 xfs_notice(mp, 510 "realtime geometry sanity check failed"); 511 return -EFSCORRUPTED; 512 } 513 } 514 515 /* 516 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign) 517 * would imply the image is corrupted. 518 */ 519 has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT; 520 if (!!sbp->sb_unit ^ has_dalign) { 521 xfs_notice(mp, "SB stripe alignment sanity check failed"); 522 return -EFSCORRUPTED; 523 } 524 525 if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit), 526 XFS_FSB_TO_B(mp, sbp->sb_width), 0, 527 xfs_buf_daddr(bp) == XFS_SB_DADDR, false)) 528 return -EFSCORRUPTED; 529 530 /* 531 * Currently only very few inode sizes are supported. 532 */ 533 switch (sbp->sb_inodesize) { 534 case 256: 535 case 512: 536 case 1024: 537 case 2048: 538 break; 539 default: 540 xfs_warn(mp, "inode size of %d bytes not supported", 541 sbp->sb_inodesize); 542 return -ENOSYS; 543 } 544 545 return 0; 546 } 547 548 void 549 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 550 { 551 /* 552 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 553 * leads to in-core values having two different values for a quota 554 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 555 * NULLFSINO. 556 * 557 * Note that this change affect only the in-core values. These 558 * values are not written back to disk unless any quota information 559 * is written to the disk. Even in that case, sb_pquotino field is 560 * not written to disk unless the superblock supports pquotino. 561 */ 562 if (sbp->sb_uquotino == 0) 563 sbp->sb_uquotino = NULLFSINO; 564 if (sbp->sb_gquotino == 0) 565 sbp->sb_gquotino = NULLFSINO; 566 if (sbp->sb_pquotino == 0) 567 sbp->sb_pquotino = NULLFSINO; 568 569 /* 570 * We need to do these manipilations only if we are working 571 * with an older version of on-disk superblock. 572 */ 573 if (xfs_sb_is_v5(sbp)) 574 return; 575 576 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 577 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 578 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 579 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 580 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 581 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 582 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 583 584 if (sbp->sb_qflags & XFS_PQUOTA_ACCT && 585 sbp->sb_gquotino != NULLFSINO) { 586 /* 587 * In older version of superblock, on-disk superblock only 588 * has sb_gquotino, and in-core superblock has both sb_gquotino 589 * and sb_pquotino. But, only one of them is supported at any 590 * point of time. So, if PQUOTA is set in disk superblock, 591 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test 592 * above is to make sure we don't do this twice and wipe them 593 * both out! 594 */ 595 sbp->sb_pquotino = sbp->sb_gquotino; 596 sbp->sb_gquotino = NULLFSINO; 597 } 598 } 599 600 static void 601 __xfs_sb_from_disk( 602 struct xfs_sb *to, 603 struct xfs_dsb *from, 604 bool convert_xquota) 605 { 606 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 607 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 608 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 609 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 610 to->sb_rextents = be64_to_cpu(from->sb_rextents); 611 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 612 to->sb_logstart = be64_to_cpu(from->sb_logstart); 613 to->sb_rootino = be64_to_cpu(from->sb_rootino); 614 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 615 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 616 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 617 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 618 to->sb_agcount = be32_to_cpu(from->sb_agcount); 619 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 620 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 621 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 622 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 623 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 624 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 625 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 626 to->sb_blocklog = from->sb_blocklog; 627 to->sb_sectlog = from->sb_sectlog; 628 to->sb_inodelog = from->sb_inodelog; 629 to->sb_inopblog = from->sb_inopblog; 630 to->sb_agblklog = from->sb_agblklog; 631 to->sb_rextslog = from->sb_rextslog; 632 to->sb_inprogress = from->sb_inprogress; 633 to->sb_imax_pct = from->sb_imax_pct; 634 to->sb_icount = be64_to_cpu(from->sb_icount); 635 to->sb_ifree = be64_to_cpu(from->sb_ifree); 636 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 637 to->sb_frextents = be64_to_cpu(from->sb_frextents); 638 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 639 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 640 to->sb_qflags = be16_to_cpu(from->sb_qflags); 641 to->sb_flags = from->sb_flags; 642 to->sb_shared_vn = from->sb_shared_vn; 643 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 644 to->sb_unit = be32_to_cpu(from->sb_unit); 645 to->sb_width = be32_to_cpu(from->sb_width); 646 to->sb_dirblklog = from->sb_dirblklog; 647 to->sb_logsectlog = from->sb_logsectlog; 648 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 649 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 650 to->sb_features2 = be32_to_cpu(from->sb_features2); 651 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 652 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 653 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 654 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 655 to->sb_features_log_incompat = 656 be32_to_cpu(from->sb_features_log_incompat); 657 /* crc is only used on disk, not in memory; just init to 0 here. */ 658 to->sb_crc = 0; 659 to->sb_spino_align = be32_to_cpu(from->sb_spino_align); 660 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 661 to->sb_lsn = be64_to_cpu(from->sb_lsn); 662 /* 663 * sb_meta_uuid is only on disk if it differs from sb_uuid and the 664 * feature flag is set; if not set we keep it only in memory. 665 */ 666 if (xfs_sb_is_v5(to) && 667 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)) 668 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 669 else 670 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); 671 /* Convert on-disk flags to in-memory flags? */ 672 if (convert_xquota) 673 xfs_sb_quota_from_disk(to); 674 } 675 676 void 677 xfs_sb_from_disk( 678 struct xfs_sb *to, 679 struct xfs_dsb *from) 680 { 681 __xfs_sb_from_disk(to, from, true); 682 } 683 684 static void 685 xfs_sb_quota_to_disk( 686 struct xfs_dsb *to, 687 struct xfs_sb *from) 688 { 689 uint16_t qflags = from->sb_qflags; 690 691 to->sb_uquotino = cpu_to_be64(from->sb_uquotino); 692 693 /* 694 * The in-memory superblock quota state matches the v5 on-disk format so 695 * just write them out and return 696 */ 697 if (xfs_sb_is_v5(from)) { 698 to->sb_qflags = cpu_to_be16(from->sb_qflags); 699 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 700 to->sb_pquotino = cpu_to_be64(from->sb_pquotino); 701 return; 702 } 703 704 /* 705 * For older superblocks (v4), the in-core version of sb_qflags do not 706 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So, 707 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. 708 */ 709 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 710 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 711 712 if (from->sb_qflags & 713 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 714 qflags |= XFS_OQUOTA_ENFD; 715 if (from->sb_qflags & 716 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 717 qflags |= XFS_OQUOTA_CHKD; 718 to->sb_qflags = cpu_to_be16(qflags); 719 720 /* 721 * GQUOTINO and PQUOTINO cannot be used together in versions 722 * of superblock that do not have pquotino. from->sb_flags 723 * tells us which quota is active and should be copied to 724 * disk. If neither are active, we should NULL the inode. 725 * 726 * In all cases, the separate pquotino must remain 0 because it 727 * is beyond the "end" of the valid non-pquotino superblock. 728 */ 729 if (from->sb_qflags & XFS_GQUOTA_ACCT) 730 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 731 else if (from->sb_qflags & XFS_PQUOTA_ACCT) 732 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 733 else { 734 /* 735 * We can't rely on just the fields being logged to tell us 736 * that it is safe to write NULLFSINO - we should only do that 737 * if quotas are not actually enabled. Hence only write 738 * NULLFSINO if both in-core quota inodes are NULL. 739 */ 740 if (from->sb_gquotino == NULLFSINO && 741 from->sb_pquotino == NULLFSINO) 742 to->sb_gquotino = cpu_to_be64(NULLFSINO); 743 } 744 745 to->sb_pquotino = 0; 746 } 747 748 void 749 xfs_sb_to_disk( 750 struct xfs_dsb *to, 751 struct xfs_sb *from) 752 { 753 xfs_sb_quota_to_disk(to, from); 754 755 to->sb_magicnum = cpu_to_be32(from->sb_magicnum); 756 to->sb_blocksize = cpu_to_be32(from->sb_blocksize); 757 to->sb_dblocks = cpu_to_be64(from->sb_dblocks); 758 to->sb_rblocks = cpu_to_be64(from->sb_rblocks); 759 to->sb_rextents = cpu_to_be64(from->sb_rextents); 760 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 761 to->sb_logstart = cpu_to_be64(from->sb_logstart); 762 to->sb_rootino = cpu_to_be64(from->sb_rootino); 763 to->sb_rbmino = cpu_to_be64(from->sb_rbmino); 764 to->sb_rsumino = cpu_to_be64(from->sb_rsumino); 765 to->sb_rextsize = cpu_to_be32(from->sb_rextsize); 766 to->sb_agblocks = cpu_to_be32(from->sb_agblocks); 767 to->sb_agcount = cpu_to_be32(from->sb_agcount); 768 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); 769 to->sb_logblocks = cpu_to_be32(from->sb_logblocks); 770 to->sb_versionnum = cpu_to_be16(from->sb_versionnum); 771 to->sb_sectsize = cpu_to_be16(from->sb_sectsize); 772 to->sb_inodesize = cpu_to_be16(from->sb_inodesize); 773 to->sb_inopblock = cpu_to_be16(from->sb_inopblock); 774 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 775 to->sb_blocklog = from->sb_blocklog; 776 to->sb_sectlog = from->sb_sectlog; 777 to->sb_inodelog = from->sb_inodelog; 778 to->sb_inopblog = from->sb_inopblog; 779 to->sb_agblklog = from->sb_agblklog; 780 to->sb_rextslog = from->sb_rextslog; 781 to->sb_inprogress = from->sb_inprogress; 782 to->sb_imax_pct = from->sb_imax_pct; 783 to->sb_icount = cpu_to_be64(from->sb_icount); 784 to->sb_ifree = cpu_to_be64(from->sb_ifree); 785 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); 786 to->sb_frextents = cpu_to_be64(from->sb_frextents); 787 788 to->sb_flags = from->sb_flags; 789 to->sb_shared_vn = from->sb_shared_vn; 790 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); 791 to->sb_unit = cpu_to_be32(from->sb_unit); 792 to->sb_width = cpu_to_be32(from->sb_width); 793 to->sb_dirblklog = from->sb_dirblklog; 794 to->sb_logsectlog = from->sb_logsectlog; 795 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); 796 to->sb_logsunit = cpu_to_be32(from->sb_logsunit); 797 798 /* 799 * We need to ensure that bad_features2 always matches features2. 800 * Hence we enforce that here rather than having to remember to do it 801 * everywhere else that updates features2. 802 */ 803 from->sb_bad_features2 = from->sb_features2; 804 to->sb_features2 = cpu_to_be32(from->sb_features2); 805 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); 806 807 if (!xfs_sb_is_v5(from)) 808 return; 809 810 to->sb_features_compat = cpu_to_be32(from->sb_features_compat); 811 to->sb_features_ro_compat = 812 cpu_to_be32(from->sb_features_ro_compat); 813 to->sb_features_incompat = 814 cpu_to_be32(from->sb_features_incompat); 815 to->sb_features_log_incompat = 816 cpu_to_be32(from->sb_features_log_incompat); 817 to->sb_spino_align = cpu_to_be32(from->sb_spino_align); 818 to->sb_lsn = cpu_to_be64(from->sb_lsn); 819 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 820 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 821 } 822 823 /* 824 * If the superblock has the CRC feature bit set or the CRC field is non-null, 825 * check that the CRC is valid. We check the CRC field is non-null because a 826 * single bit error could clear the feature bit and unused parts of the 827 * superblock are supposed to be zero. Hence a non-null crc field indicates that 828 * we've potentially lost a feature bit and we should check it anyway. 829 * 830 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 831 * last field in V4 secondary superblocks. So for secondary superblocks, 832 * we are more forgiving, and ignore CRC failures if the primary doesn't 833 * indicate that the fs version is V5. 834 */ 835 static void 836 xfs_sb_read_verify( 837 struct xfs_buf *bp) 838 { 839 struct xfs_sb sb; 840 struct xfs_mount *mp = bp->b_mount; 841 struct xfs_dsb *dsb = bp->b_addr; 842 int error; 843 844 /* 845 * open code the version check to avoid needing to convert the entire 846 * superblock from disk order just to check the version number 847 */ 848 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 849 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 850 XFS_SB_VERSION_5) || 851 dsb->sb_crc != 0)) { 852 853 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 854 /* Only fail bad secondaries on a known V5 filesystem */ 855 if (xfs_buf_daddr(bp) == XFS_SB_DADDR || 856 xfs_has_crc(mp)) { 857 error = -EFSBADCRC; 858 goto out_error; 859 } 860 } 861 } 862 863 /* 864 * Check all the superblock fields. Don't byteswap the xquota flags 865 * because _verify_common checks the on-disk values. 866 */ 867 __xfs_sb_from_disk(&sb, dsb, false); 868 error = xfs_validate_sb_common(mp, bp, &sb); 869 if (error) 870 goto out_error; 871 error = xfs_validate_sb_read(mp, &sb); 872 873 out_error: 874 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 875 xfs_verifier_error(bp, error, __this_address); 876 else if (error) 877 xfs_buf_ioerror(bp, error); 878 } 879 880 /* 881 * We may be probed for a filesystem match, so we may not want to emit 882 * messages when the superblock buffer is not actually an XFS superblock. 883 * If we find an XFS superblock, then run a normal, noisy mount because we are 884 * really going to mount it and want to know about errors. 885 */ 886 static void 887 xfs_sb_quiet_read_verify( 888 struct xfs_buf *bp) 889 { 890 struct xfs_dsb *dsb = bp->b_addr; 891 892 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 893 /* XFS filesystem, verify noisily! */ 894 xfs_sb_read_verify(bp); 895 return; 896 } 897 /* quietly fail */ 898 xfs_buf_ioerror(bp, -EWRONGFS); 899 } 900 901 static void 902 xfs_sb_write_verify( 903 struct xfs_buf *bp) 904 { 905 struct xfs_sb sb; 906 struct xfs_mount *mp = bp->b_mount; 907 struct xfs_buf_log_item *bip = bp->b_log_item; 908 struct xfs_dsb *dsb = bp->b_addr; 909 int error; 910 911 /* 912 * Check all the superblock fields. Don't byteswap the xquota flags 913 * because _verify_common checks the on-disk values. 914 */ 915 __xfs_sb_from_disk(&sb, dsb, false); 916 error = xfs_validate_sb_common(mp, bp, &sb); 917 if (error) 918 goto out_error; 919 error = xfs_validate_sb_write(mp, bp, &sb); 920 if (error) 921 goto out_error; 922 923 if (!xfs_sb_is_v5(&sb)) 924 return; 925 926 if (bip) 927 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 928 929 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 930 return; 931 932 out_error: 933 xfs_verifier_error(bp, error, __this_address); 934 } 935 936 const struct xfs_buf_ops xfs_sb_buf_ops = { 937 .name = "xfs_sb", 938 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 939 .verify_read = xfs_sb_read_verify, 940 .verify_write = xfs_sb_write_verify, 941 }; 942 943 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 944 .name = "xfs_sb_quiet", 945 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 946 .verify_read = xfs_sb_quiet_read_verify, 947 .verify_write = xfs_sb_write_verify, 948 }; 949 950 /* 951 * xfs_mount_common 952 * 953 * Mount initialization code establishing various mount 954 * fields from the superblock associated with the given 955 * mount structure. 956 * 957 * Inode geometry are calculated in xfs_ialloc_setup_geometry. 958 */ 959 void 960 xfs_sb_mount_common( 961 struct xfs_mount *mp, 962 struct xfs_sb *sbp) 963 { 964 mp->m_agfrotor = 0; 965 atomic_set(&mp->m_agirotor, 0); 966 mp->m_maxagi = mp->m_sb.sb_agcount; 967 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 968 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 969 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 970 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 971 mp->m_blockmask = sbp->sb_blocksize - 1; 972 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 973 mp->m_blockwmask = mp->m_blockwsize - 1; 974 975 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 976 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 977 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 978 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 979 980 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 981 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 982 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 983 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 984 985 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1); 986 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0); 987 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; 988 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; 989 990 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true); 991 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false); 992 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; 993 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; 994 995 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 996 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 997 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp); 998 } 999 1000 /* 1001 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock 1002 * into the superblock buffer to be logged. It does not provide the higher 1003 * level of locking that is needed to protect the in-core superblock from 1004 * concurrent access. 1005 */ 1006 void 1007 xfs_log_sb( 1008 struct xfs_trans *tp) 1009 { 1010 struct xfs_mount *mp = tp->t_mountp; 1011 struct xfs_buf *bp = xfs_trans_getsb(tp); 1012 1013 /* 1014 * Lazy sb counters don't update the in-core superblock so do that now. 1015 * If this is at unmount, the counters will be exactly correct, but at 1016 * any other time they will only be ballpark correct because of 1017 * reservations that have been taken out percpu counters. If we have an 1018 * unclean shutdown, this will be corrected by log recovery rebuilding 1019 * the counters from the AGF block counts. 1020 * 1021 * Do not update sb_frextents here because it is not part of the lazy 1022 * sb counters, despite having a percpu counter. It is always kept 1023 * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas() 1024 * and hence we don't need have to update it here. 1025 */ 1026 if (xfs_has_lazysbcount(mp)) { 1027 mp->m_sb.sb_icount = percpu_counter_sum_positive(&mp->m_icount); 1028 mp->m_sb.sb_ifree = min_t(uint64_t, 1029 percpu_counter_sum_positive(&mp->m_ifree), 1030 mp->m_sb.sb_icount); 1031 mp->m_sb.sb_fdblocks = 1032 percpu_counter_sum_positive(&mp->m_fdblocks); 1033 } 1034 1035 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1036 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 1037 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1); 1038 } 1039 1040 /* 1041 * xfs_sync_sb 1042 * 1043 * Sync the superblock to disk. 1044 * 1045 * Note that the caller is responsible for checking the frozen state of the 1046 * filesystem. This procedure uses the non-blocking transaction allocator and 1047 * thus will allow modifications to a frozen fs. This is required because this 1048 * code can be called during the process of freezing where use of the high-level 1049 * allocator would deadlock. 1050 */ 1051 int 1052 xfs_sync_sb( 1053 struct xfs_mount *mp, 1054 bool wait) 1055 { 1056 struct xfs_trans *tp; 1057 int error; 1058 1059 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 1060 XFS_TRANS_NO_WRITECOUNT, &tp); 1061 if (error) 1062 return error; 1063 1064 xfs_log_sb(tp); 1065 if (wait) 1066 xfs_trans_set_sync(tp); 1067 return xfs_trans_commit(tp); 1068 } 1069 1070 /* 1071 * Update all the secondary superblocks to match the new state of the primary. 1072 * Because we are completely overwriting all the existing fields in the 1073 * secondary superblock buffers, there is no need to read them in from disk. 1074 * Just get a new buffer, stamp it and write it. 1075 * 1076 * The sb buffers need to be cached here so that we serialise against other 1077 * operations that access the secondary superblocks, but we don't want to keep 1078 * them in memory once it is written so we mark it as a one-shot buffer. 1079 */ 1080 int 1081 xfs_update_secondary_sbs( 1082 struct xfs_mount *mp) 1083 { 1084 struct xfs_perag *pag; 1085 xfs_agnumber_t agno = 1; 1086 int saved_error = 0; 1087 int error = 0; 1088 LIST_HEAD (buffer_list); 1089 1090 /* update secondary superblocks. */ 1091 for_each_perag_from(mp, agno, pag) { 1092 struct xfs_buf *bp; 1093 1094 error = xfs_buf_get(mp->m_ddev_targp, 1095 XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR), 1096 XFS_FSS_TO_BB(mp, 1), &bp); 1097 /* 1098 * If we get an error reading or writing alternate superblocks, 1099 * continue. xfs_repair chooses the "best" superblock based 1100 * on most matches; if we break early, we'll leave more 1101 * superblocks un-updated than updated, and xfs_repair may 1102 * pick them over the properly-updated primary. 1103 */ 1104 if (error) { 1105 xfs_warn(mp, 1106 "error allocating secondary superblock for ag %d", 1107 pag->pag_agno); 1108 if (!saved_error) 1109 saved_error = error; 1110 continue; 1111 } 1112 1113 bp->b_ops = &xfs_sb_buf_ops; 1114 xfs_buf_oneshot(bp); 1115 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 1116 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1117 xfs_buf_delwri_queue(bp, &buffer_list); 1118 xfs_buf_relse(bp); 1119 1120 /* don't hold too many buffers at once */ 1121 if (agno % 16) 1122 continue; 1123 1124 error = xfs_buf_delwri_submit(&buffer_list); 1125 if (error) { 1126 xfs_warn(mp, 1127 "write error %d updating a secondary superblock near ag %d", 1128 error, pag->pag_agno); 1129 if (!saved_error) 1130 saved_error = error; 1131 continue; 1132 } 1133 } 1134 error = xfs_buf_delwri_submit(&buffer_list); 1135 if (error) { 1136 xfs_warn(mp, 1137 "write error %d updating a secondary superblock near ag %d", 1138 error, agno); 1139 } 1140 1141 return saved_error ? saved_error : error; 1142 } 1143 1144 /* 1145 * Same behavior as xfs_sync_sb, except that it is always synchronous and it 1146 * also writes the superblock buffer to disk sector 0 immediately. 1147 */ 1148 int 1149 xfs_sync_sb_buf( 1150 struct xfs_mount *mp) 1151 { 1152 struct xfs_trans *tp; 1153 struct xfs_buf *bp; 1154 int error; 1155 1156 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp); 1157 if (error) 1158 return error; 1159 1160 bp = xfs_trans_getsb(tp); 1161 xfs_log_sb(tp); 1162 xfs_trans_bhold(tp, bp); 1163 xfs_trans_set_sync(tp); 1164 error = xfs_trans_commit(tp); 1165 if (error) 1166 goto out; 1167 /* 1168 * write out the sb buffer to get the changes to disk 1169 */ 1170 error = xfs_bwrite(bp); 1171 out: 1172 xfs_buf_relse(bp); 1173 return error; 1174 } 1175 1176 void 1177 xfs_fs_geometry( 1178 struct xfs_mount *mp, 1179 struct xfs_fsop_geom *geo, 1180 int struct_version) 1181 { 1182 struct xfs_sb *sbp = &mp->m_sb; 1183 1184 memset(geo, 0, sizeof(struct xfs_fsop_geom)); 1185 1186 geo->blocksize = sbp->sb_blocksize; 1187 geo->rtextsize = sbp->sb_rextsize; 1188 geo->agblocks = sbp->sb_agblocks; 1189 geo->agcount = sbp->sb_agcount; 1190 geo->logblocks = sbp->sb_logblocks; 1191 geo->sectsize = sbp->sb_sectsize; 1192 geo->inodesize = sbp->sb_inodesize; 1193 geo->imaxpct = sbp->sb_imax_pct; 1194 geo->datablocks = sbp->sb_dblocks; 1195 geo->rtblocks = sbp->sb_rblocks; 1196 geo->rtextents = sbp->sb_rextents; 1197 geo->logstart = sbp->sb_logstart; 1198 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid)); 1199 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid)); 1200 1201 if (struct_version < 2) 1202 return; 1203 1204 geo->sunit = sbp->sb_unit; 1205 geo->swidth = sbp->sb_width; 1206 1207 if (struct_version < 3) 1208 return; 1209 1210 geo->version = XFS_FSOP_GEOM_VERSION; 1211 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 1212 XFS_FSOP_GEOM_FLAGS_DIRV2 | 1213 XFS_FSOP_GEOM_FLAGS_EXTFLG; 1214 if (xfs_has_attr(mp)) 1215 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR; 1216 if (xfs_has_quota(mp)) 1217 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA; 1218 if (xfs_has_align(mp)) 1219 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN; 1220 if (xfs_has_dalign(mp)) 1221 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN; 1222 if (xfs_has_asciici(mp)) 1223 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI; 1224 if (xfs_has_lazysbcount(mp)) 1225 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB; 1226 if (xfs_has_attr2(mp)) 1227 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2; 1228 if (xfs_has_projid32(mp)) 1229 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32; 1230 if (xfs_has_crc(mp)) 1231 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB; 1232 if (xfs_has_ftype(mp)) 1233 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE; 1234 if (xfs_has_finobt(mp)) 1235 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT; 1236 if (xfs_has_sparseinodes(mp)) 1237 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES; 1238 if (xfs_has_rmapbt(mp)) 1239 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT; 1240 if (xfs_has_reflink(mp)) 1241 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK; 1242 if (xfs_has_bigtime(mp)) 1243 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME; 1244 if (xfs_has_inobtcounts(mp)) 1245 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT; 1246 if (xfs_has_sector(mp)) { 1247 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR; 1248 geo->logsectsize = sbp->sb_logsectsize; 1249 } else { 1250 geo->logsectsize = BBSIZE; 1251 } 1252 if (xfs_has_large_extent_counts(mp)) 1253 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64; 1254 geo->rtsectsize = sbp->sb_blocksize; 1255 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp); 1256 1257 if (struct_version < 4) 1258 return; 1259 1260 if (xfs_has_logv2(mp)) 1261 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2; 1262 1263 geo->logsunit = sbp->sb_logsunit; 1264 1265 if (struct_version < 5) 1266 return; 1267 1268 geo->version = XFS_FSOP_GEOM_VERSION_V5; 1269 } 1270 1271 /* Read a secondary superblock. */ 1272 int 1273 xfs_sb_read_secondary( 1274 struct xfs_mount *mp, 1275 struct xfs_trans *tp, 1276 xfs_agnumber_t agno, 1277 struct xfs_buf **bpp) 1278 { 1279 struct xfs_buf *bp; 1280 int error; 1281 1282 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1283 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, 1284 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1285 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops); 1286 if (error) 1287 return error; 1288 xfs_buf_set_ref(bp, XFS_SSB_REF); 1289 *bpp = bp; 1290 return 0; 1291 } 1292 1293 /* Get an uninitialised secondary superblock buffer. */ 1294 int 1295 xfs_sb_get_secondary( 1296 struct xfs_mount *mp, 1297 struct xfs_trans *tp, 1298 xfs_agnumber_t agno, 1299 struct xfs_buf **bpp) 1300 { 1301 struct xfs_buf *bp; 1302 int error; 1303 1304 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1305 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, 1306 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1307 XFS_FSS_TO_BB(mp, 1), 0, &bp); 1308 if (error) 1309 return error; 1310 bp->b_ops = &xfs_sb_buf_ops; 1311 xfs_buf_oneshot(bp); 1312 *bpp = bp; 1313 return 0; 1314 } 1315 1316 /* 1317 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, so users 1318 * won't be confused by values in error messages. This function returns false 1319 * if the stripe geometry is invalid and the caller is unable to repair the 1320 * stripe configuration later in the mount process. 1321 */ 1322 bool 1323 xfs_validate_stripe_geometry( 1324 struct xfs_mount *mp, 1325 __s64 sunit, 1326 __s64 swidth, 1327 int sectorsize, 1328 bool may_repair, 1329 bool silent) 1330 { 1331 if (swidth > INT_MAX) { 1332 if (!silent) 1333 xfs_notice(mp, 1334 "stripe width (%lld) is too large", swidth); 1335 goto check_override; 1336 } 1337 1338 if (sunit > swidth) { 1339 if (!silent) 1340 xfs_notice(mp, 1341 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth); 1342 goto check_override; 1343 } 1344 1345 if (sectorsize && (int)sunit % sectorsize) { 1346 if (!silent) 1347 xfs_notice(mp, 1348 "stripe unit (%lld) must be a multiple of the sector size (%d)", 1349 sunit, sectorsize); 1350 goto check_override; 1351 } 1352 1353 if (sunit && !swidth) { 1354 if (!silent) 1355 xfs_notice(mp, 1356 "invalid stripe unit (%lld) and stripe width of 0", sunit); 1357 goto check_override; 1358 } 1359 1360 if (!sunit && swidth) { 1361 if (!silent) 1362 xfs_notice(mp, 1363 "invalid stripe width (%lld) and stripe unit of 0", swidth); 1364 goto check_override; 1365 } 1366 1367 if (sunit && (int)swidth % (int)sunit) { 1368 if (!silent) 1369 xfs_notice(mp, 1370 "stripe width (%lld) must be a multiple of the stripe unit (%lld)", 1371 swidth, sunit); 1372 goto check_override; 1373 } 1374 return true; 1375 1376 check_override: 1377 if (!may_repair) 1378 return false; 1379 /* 1380 * During mount, mp->m_dalign will not be set unless the sunit mount 1381 * option was set. If it was set, ignore the bad stripe alignment values 1382 * and allow the validation and overwrite later in the mount process to 1383 * attempt to overwrite the bad stripe alignment values with the values 1384 * supplied by mount options. 1385 */ 1386 if (!mp->m_dalign) 1387 return false; 1388 if (!silent) 1389 xfs_notice(mp, 1390 "Will try to correct with specified mount options sunit (%d) and swidth (%d)", 1391 BBTOB(mp->m_dalign), BBTOB(mp->m_swidth)); 1392 return true; 1393 } 1394 1395 /* 1396 * Compute the maximum level number of the realtime summary file, as defined by 1397 * mkfs. The historic use of highbit32 on a 64-bit quantity prohibited correct 1398 * use of rt volumes with more than 2^32 extents. 1399 */ 1400 uint8_t 1401 xfs_compute_rextslog( 1402 xfs_rtbxlen_t rtextents) 1403 { 1404 if (!rtextents) 1405 return 0; 1406 return xfs_highbit64(rtextents); 1407 } 1408