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_is_readonly(mp) && 270 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 271 xfs_alert(mp, 272 "Corruption detected in superblock read-only compatible features (0x%x)!", 273 (sbp->sb_features_ro_compat & 274 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 275 return -EFSCORRUPTED; 276 } 277 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 278 xfs_warn(mp, 279 "Corruption detected in superblock incompatible features (0x%x)!", 280 (sbp->sb_features_incompat & 281 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 282 return -EFSCORRUPTED; 283 } 284 if (xfs_sb_has_incompat_log_feature(sbp, 285 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) { 286 xfs_warn(mp, 287 "Corruption detected in superblock incompatible log features (0x%x)!", 288 (sbp->sb_features_log_incompat & 289 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)); 290 return -EFSCORRUPTED; 291 } 292 293 /* 294 * We can't read verify the sb LSN because the read verifier is called 295 * before the log is allocated and processed. We know the log is set up 296 * before write verifier calls, so check it here. 297 */ 298 if (!xfs_log_check_lsn(mp, sbp->sb_lsn)) 299 return -EFSCORRUPTED; 300 301 return 0; 302 } 303 304 /* Check the validity of the SB. */ 305 STATIC int 306 xfs_validate_sb_common( 307 struct xfs_mount *mp, 308 struct xfs_buf *bp, 309 struct xfs_sb *sbp) 310 { 311 struct xfs_dsb *dsb = bp->b_addr; 312 uint32_t agcount = 0; 313 uint32_t rem; 314 bool has_dalign; 315 316 if (!xfs_verify_magic(bp, dsb->sb_magicnum)) { 317 xfs_warn(mp, 318 "Superblock has bad magic number 0x%x. Not an XFS filesystem?", 319 be32_to_cpu(dsb->sb_magicnum)); 320 return -EWRONGFS; 321 } 322 323 if (!xfs_sb_good_version(sbp)) { 324 xfs_warn(mp, 325 "Superblock has unknown features enabled or corrupted feature masks."); 326 return -EWRONGFS; 327 } 328 329 /* 330 * Validate feature flags and state 331 */ 332 if (xfs_sb_is_v5(sbp)) { 333 if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) { 334 xfs_notice(mp, 335 "Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)", 336 sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE); 337 return -EFSCORRUPTED; 338 } 339 340 /* V5 has a separate project quota inode */ 341 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { 342 xfs_notice(mp, 343 "Version 5 of Super block has XFS_OQUOTA bits."); 344 return -EFSCORRUPTED; 345 } 346 347 /* 348 * Full inode chunks must be aligned to inode chunk size when 349 * sparse inodes are enabled to support the sparse chunk 350 * allocation algorithm and prevent overlapping inode records. 351 */ 352 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) { 353 uint32_t align; 354 355 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize 356 >> sbp->sb_blocklog; 357 if (sbp->sb_inoalignmt != align) { 358 xfs_warn(mp, 359 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.", 360 sbp->sb_inoalignmt, align); 361 return -EINVAL; 362 } 363 } 364 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | 365 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { 366 xfs_notice(mp, 367 "Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits."); 368 return -EFSCORRUPTED; 369 } 370 371 if (unlikely( 372 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 373 xfs_warn(mp, 374 "filesystem is marked as having an external log; " 375 "specify logdev on the mount command line."); 376 return -EINVAL; 377 } 378 379 if (unlikely( 380 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 381 xfs_warn(mp, 382 "filesystem is marked as having an internal log; " 383 "do not specify logdev on the mount command line."); 384 return -EINVAL; 385 } 386 387 /* Compute agcount for this number of dblocks and agblocks */ 388 if (sbp->sb_agblocks) { 389 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem); 390 if (rem) 391 agcount++; 392 } 393 394 /* 395 * More sanity checking. Most of these were stolen directly from 396 * xfs_repair. 397 */ 398 if (unlikely( 399 sbp->sb_agcount <= 0 || 400 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 401 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 402 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 403 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 404 sbp->sb_sectsize != (1 << sbp->sb_sectlog) || 405 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 406 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 407 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 408 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 409 sbp->sb_blocksize != (1 << sbp->sb_blocklog) || 410 sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 411 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 412 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 413 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 414 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 415 sbp->sb_inodesize != (1 << sbp->sb_inodelog) || 416 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || 417 XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES || 418 XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES || 419 sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 || 420 agcount == 0 || agcount != sbp->sb_agcount || 421 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 422 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 423 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 424 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || 425 sbp->sb_dblocks == 0 || 426 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || 427 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || 428 sbp->sb_shared_vn != 0)) { 429 xfs_notice(mp, "SB sanity check failed"); 430 return -EFSCORRUPTED; 431 } 432 433 /* 434 * Logs that are too large are not supported at all. Reject them 435 * outright. Logs that are too small are tolerated on v4 filesystems, 436 * but we can only check that when mounting the log. Hence we skip 437 * those checks here. 438 */ 439 if (sbp->sb_logblocks > XFS_MAX_LOG_BLOCKS) { 440 xfs_notice(mp, 441 "Log size 0x%x blocks too large, maximum size is 0x%llx blocks", 442 sbp->sb_logblocks, XFS_MAX_LOG_BLOCKS); 443 return -EFSCORRUPTED; 444 } 445 446 if (XFS_FSB_TO_B(mp, sbp->sb_logblocks) > XFS_MAX_LOG_BYTES) { 447 xfs_warn(mp, 448 "log size 0x%llx bytes too large, maximum size is 0x%llx bytes", 449 XFS_FSB_TO_B(mp, sbp->sb_logblocks), 450 XFS_MAX_LOG_BYTES); 451 return -EFSCORRUPTED; 452 } 453 454 /* 455 * Do not allow filesystems with corrupted log sector or stripe units to 456 * be mounted. We cannot safely size the iclogs or write to the log if 457 * the log stripe unit is not valid. 458 */ 459 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) { 460 if (sbp->sb_logsectsize != (1U << sbp->sb_logsectlog)) { 461 xfs_notice(mp, 462 "log sector size in bytes/log2 (0x%x/0x%x) must match", 463 sbp->sb_logsectsize, 1U << sbp->sb_logsectlog); 464 return -EFSCORRUPTED; 465 } 466 } else if (sbp->sb_logsectsize || sbp->sb_logsectlog) { 467 xfs_notice(mp, 468 "log sector size in bytes/log2 (0x%x/0x%x) are not zero", 469 sbp->sb_logsectsize, sbp->sb_logsectlog); 470 return -EFSCORRUPTED; 471 } 472 473 if (sbp->sb_logsunit > 1) { 474 if (sbp->sb_logsunit % sbp->sb_blocksize) { 475 xfs_notice(mp, 476 "log stripe unit 0x%x bytes must be a multiple of block size", 477 sbp->sb_logsunit); 478 return -EFSCORRUPTED; 479 } 480 if (sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE) { 481 xfs_notice(mp, 482 "log stripe unit 0x%x bytes over maximum size (0x%x bytes)", 483 sbp->sb_logsunit, XLOG_MAX_RECORD_BSIZE); 484 return -EFSCORRUPTED; 485 } 486 } 487 488 /* Validate the realtime geometry; stolen from xfs_repair */ 489 if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE || 490 sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) { 491 xfs_notice(mp, 492 "realtime extent sanity check failed"); 493 return -EFSCORRUPTED; 494 } 495 496 if (sbp->sb_rblocks == 0) { 497 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 || 498 sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) { 499 xfs_notice(mp, 500 "realtime zeroed geometry check failed"); 501 return -EFSCORRUPTED; 502 } 503 } else { 504 uint64_t rexts; 505 uint64_t rbmblocks; 506 507 rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize); 508 rbmblocks = howmany_64(sbp->sb_rextents, 509 NBBY * sbp->sb_blocksize); 510 511 if (sbp->sb_rextents != rexts || 512 sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) || 513 sbp->sb_rbmblocks != rbmblocks) { 514 xfs_notice(mp, 515 "realtime geometry sanity check failed"); 516 return -EFSCORRUPTED; 517 } 518 } 519 520 /* 521 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign) 522 * would imply the image is corrupted. 523 */ 524 has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT; 525 if (!!sbp->sb_unit ^ has_dalign) { 526 xfs_notice(mp, "SB stripe alignment sanity check failed"); 527 return -EFSCORRUPTED; 528 } 529 530 if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit), 531 XFS_FSB_TO_B(mp, sbp->sb_width), 0, false)) 532 return -EFSCORRUPTED; 533 534 /* 535 * Currently only very few inode sizes are supported. 536 */ 537 switch (sbp->sb_inodesize) { 538 case 256: 539 case 512: 540 case 1024: 541 case 2048: 542 break; 543 default: 544 xfs_warn(mp, "inode size of %d bytes not supported", 545 sbp->sb_inodesize); 546 return -ENOSYS; 547 } 548 549 return 0; 550 } 551 552 void 553 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 554 { 555 /* 556 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 557 * leads to in-core values having two different values for a quota 558 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 559 * NULLFSINO. 560 * 561 * Note that this change affect only the in-core values. These 562 * values are not written back to disk unless any quota information 563 * is written to the disk. Even in that case, sb_pquotino field is 564 * not written to disk unless the superblock supports pquotino. 565 */ 566 if (sbp->sb_uquotino == 0) 567 sbp->sb_uquotino = NULLFSINO; 568 if (sbp->sb_gquotino == 0) 569 sbp->sb_gquotino = NULLFSINO; 570 if (sbp->sb_pquotino == 0) 571 sbp->sb_pquotino = NULLFSINO; 572 573 /* 574 * We need to do these manipilations only if we are working 575 * with an older version of on-disk superblock. 576 */ 577 if (xfs_sb_is_v5(sbp)) 578 return; 579 580 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 581 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 582 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 583 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 584 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 585 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 586 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 587 588 if (sbp->sb_qflags & XFS_PQUOTA_ACCT && 589 sbp->sb_gquotino != NULLFSINO) { 590 /* 591 * In older version of superblock, on-disk superblock only 592 * has sb_gquotino, and in-core superblock has both sb_gquotino 593 * and sb_pquotino. But, only one of them is supported at any 594 * point of time. So, if PQUOTA is set in disk superblock, 595 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test 596 * above is to make sure we don't do this twice and wipe them 597 * both out! 598 */ 599 sbp->sb_pquotino = sbp->sb_gquotino; 600 sbp->sb_gquotino = NULLFSINO; 601 } 602 } 603 604 static void 605 __xfs_sb_from_disk( 606 struct xfs_sb *to, 607 struct xfs_dsb *from, 608 bool convert_xquota) 609 { 610 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 611 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 612 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 613 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 614 to->sb_rextents = be64_to_cpu(from->sb_rextents); 615 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 616 to->sb_logstart = be64_to_cpu(from->sb_logstart); 617 to->sb_rootino = be64_to_cpu(from->sb_rootino); 618 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 619 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 620 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 621 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 622 to->sb_agcount = be32_to_cpu(from->sb_agcount); 623 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 624 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 625 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 626 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 627 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 628 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 629 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 630 to->sb_blocklog = from->sb_blocklog; 631 to->sb_sectlog = from->sb_sectlog; 632 to->sb_inodelog = from->sb_inodelog; 633 to->sb_inopblog = from->sb_inopblog; 634 to->sb_agblklog = from->sb_agblklog; 635 to->sb_rextslog = from->sb_rextslog; 636 to->sb_inprogress = from->sb_inprogress; 637 to->sb_imax_pct = from->sb_imax_pct; 638 to->sb_icount = be64_to_cpu(from->sb_icount); 639 to->sb_ifree = be64_to_cpu(from->sb_ifree); 640 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 641 to->sb_frextents = be64_to_cpu(from->sb_frextents); 642 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 643 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 644 to->sb_qflags = be16_to_cpu(from->sb_qflags); 645 to->sb_flags = from->sb_flags; 646 to->sb_shared_vn = from->sb_shared_vn; 647 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 648 to->sb_unit = be32_to_cpu(from->sb_unit); 649 to->sb_width = be32_to_cpu(from->sb_width); 650 to->sb_dirblklog = from->sb_dirblklog; 651 to->sb_logsectlog = from->sb_logsectlog; 652 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 653 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 654 to->sb_features2 = be32_to_cpu(from->sb_features2); 655 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 656 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 657 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 658 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 659 to->sb_features_log_incompat = 660 be32_to_cpu(from->sb_features_log_incompat); 661 /* crc is only used on disk, not in memory; just init to 0 here. */ 662 to->sb_crc = 0; 663 to->sb_spino_align = be32_to_cpu(from->sb_spino_align); 664 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 665 to->sb_lsn = be64_to_cpu(from->sb_lsn); 666 /* 667 * sb_meta_uuid is only on disk if it differs from sb_uuid and the 668 * feature flag is set; if not set we keep it only in memory. 669 */ 670 if (xfs_sb_is_v5(to) && 671 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)) 672 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 673 else 674 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); 675 /* Convert on-disk flags to in-memory flags? */ 676 if (convert_xquota) 677 xfs_sb_quota_from_disk(to); 678 } 679 680 void 681 xfs_sb_from_disk( 682 struct xfs_sb *to, 683 struct xfs_dsb *from) 684 { 685 __xfs_sb_from_disk(to, from, true); 686 } 687 688 static void 689 xfs_sb_quota_to_disk( 690 struct xfs_dsb *to, 691 struct xfs_sb *from) 692 { 693 uint16_t qflags = from->sb_qflags; 694 695 to->sb_uquotino = cpu_to_be64(from->sb_uquotino); 696 697 /* 698 * The in-memory superblock quota state matches the v5 on-disk format so 699 * just write them out and return 700 */ 701 if (xfs_sb_is_v5(from)) { 702 to->sb_qflags = cpu_to_be16(from->sb_qflags); 703 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 704 to->sb_pquotino = cpu_to_be64(from->sb_pquotino); 705 return; 706 } 707 708 /* 709 * For older superblocks (v4), the in-core version of sb_qflags do not 710 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So, 711 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. 712 */ 713 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 714 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 715 716 if (from->sb_qflags & 717 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 718 qflags |= XFS_OQUOTA_ENFD; 719 if (from->sb_qflags & 720 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 721 qflags |= XFS_OQUOTA_CHKD; 722 to->sb_qflags = cpu_to_be16(qflags); 723 724 /* 725 * GQUOTINO and PQUOTINO cannot be used together in versions 726 * of superblock that do not have pquotino. from->sb_flags 727 * tells us which quota is active and should be copied to 728 * disk. If neither are active, we should NULL the inode. 729 * 730 * In all cases, the separate pquotino must remain 0 because it 731 * is beyond the "end" of the valid non-pquotino superblock. 732 */ 733 if (from->sb_qflags & XFS_GQUOTA_ACCT) 734 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 735 else if (from->sb_qflags & XFS_PQUOTA_ACCT) 736 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 737 else { 738 /* 739 * We can't rely on just the fields being logged to tell us 740 * that it is safe to write NULLFSINO - we should only do that 741 * if quotas are not actually enabled. Hence only write 742 * NULLFSINO if both in-core quota inodes are NULL. 743 */ 744 if (from->sb_gquotino == NULLFSINO && 745 from->sb_pquotino == NULLFSINO) 746 to->sb_gquotino = cpu_to_be64(NULLFSINO); 747 } 748 749 to->sb_pquotino = 0; 750 } 751 752 void 753 xfs_sb_to_disk( 754 struct xfs_dsb *to, 755 struct xfs_sb *from) 756 { 757 xfs_sb_quota_to_disk(to, from); 758 759 to->sb_magicnum = cpu_to_be32(from->sb_magicnum); 760 to->sb_blocksize = cpu_to_be32(from->sb_blocksize); 761 to->sb_dblocks = cpu_to_be64(from->sb_dblocks); 762 to->sb_rblocks = cpu_to_be64(from->sb_rblocks); 763 to->sb_rextents = cpu_to_be64(from->sb_rextents); 764 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 765 to->sb_logstart = cpu_to_be64(from->sb_logstart); 766 to->sb_rootino = cpu_to_be64(from->sb_rootino); 767 to->sb_rbmino = cpu_to_be64(from->sb_rbmino); 768 to->sb_rsumino = cpu_to_be64(from->sb_rsumino); 769 to->sb_rextsize = cpu_to_be32(from->sb_rextsize); 770 to->sb_agblocks = cpu_to_be32(from->sb_agblocks); 771 to->sb_agcount = cpu_to_be32(from->sb_agcount); 772 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); 773 to->sb_logblocks = cpu_to_be32(from->sb_logblocks); 774 to->sb_versionnum = cpu_to_be16(from->sb_versionnum); 775 to->sb_sectsize = cpu_to_be16(from->sb_sectsize); 776 to->sb_inodesize = cpu_to_be16(from->sb_inodesize); 777 to->sb_inopblock = cpu_to_be16(from->sb_inopblock); 778 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 779 to->sb_blocklog = from->sb_blocklog; 780 to->sb_sectlog = from->sb_sectlog; 781 to->sb_inodelog = from->sb_inodelog; 782 to->sb_inopblog = from->sb_inopblog; 783 to->sb_agblklog = from->sb_agblklog; 784 to->sb_rextslog = from->sb_rextslog; 785 to->sb_inprogress = from->sb_inprogress; 786 to->sb_imax_pct = from->sb_imax_pct; 787 to->sb_icount = cpu_to_be64(from->sb_icount); 788 to->sb_ifree = cpu_to_be64(from->sb_ifree); 789 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); 790 to->sb_frextents = cpu_to_be64(from->sb_frextents); 791 792 to->sb_flags = from->sb_flags; 793 to->sb_shared_vn = from->sb_shared_vn; 794 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); 795 to->sb_unit = cpu_to_be32(from->sb_unit); 796 to->sb_width = cpu_to_be32(from->sb_width); 797 to->sb_dirblklog = from->sb_dirblklog; 798 to->sb_logsectlog = from->sb_logsectlog; 799 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); 800 to->sb_logsunit = cpu_to_be32(from->sb_logsunit); 801 802 /* 803 * We need to ensure that bad_features2 always matches features2. 804 * Hence we enforce that here rather than having to remember to do it 805 * everywhere else that updates features2. 806 */ 807 from->sb_bad_features2 = from->sb_features2; 808 to->sb_features2 = cpu_to_be32(from->sb_features2); 809 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); 810 811 if (!xfs_sb_is_v5(from)) 812 return; 813 814 to->sb_features_compat = cpu_to_be32(from->sb_features_compat); 815 to->sb_features_ro_compat = 816 cpu_to_be32(from->sb_features_ro_compat); 817 to->sb_features_incompat = 818 cpu_to_be32(from->sb_features_incompat); 819 to->sb_features_log_incompat = 820 cpu_to_be32(from->sb_features_log_incompat); 821 to->sb_spino_align = cpu_to_be32(from->sb_spino_align); 822 to->sb_lsn = cpu_to_be64(from->sb_lsn); 823 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 824 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 825 } 826 827 /* 828 * If the superblock has the CRC feature bit set or the CRC field is non-null, 829 * check that the CRC is valid. We check the CRC field is non-null because a 830 * single bit error could clear the feature bit and unused parts of the 831 * superblock are supposed to be zero. Hence a non-null crc field indicates that 832 * we've potentially lost a feature bit and we should check it anyway. 833 * 834 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 835 * last field in V4 secondary superblocks. So for secondary superblocks, 836 * we are more forgiving, and ignore CRC failures if the primary doesn't 837 * indicate that the fs version is V5. 838 */ 839 static void 840 xfs_sb_read_verify( 841 struct xfs_buf *bp) 842 { 843 struct xfs_sb sb; 844 struct xfs_mount *mp = bp->b_mount; 845 struct xfs_dsb *dsb = bp->b_addr; 846 int error; 847 848 /* 849 * open code the version check to avoid needing to convert the entire 850 * superblock from disk order just to check the version number 851 */ 852 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 853 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 854 XFS_SB_VERSION_5) || 855 dsb->sb_crc != 0)) { 856 857 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 858 /* Only fail bad secondaries on a known V5 filesystem */ 859 if (xfs_buf_daddr(bp) == XFS_SB_DADDR || 860 xfs_has_crc(mp)) { 861 error = -EFSBADCRC; 862 goto out_error; 863 } 864 } 865 } 866 867 /* 868 * Check all the superblock fields. Don't byteswap the xquota flags 869 * because _verify_common checks the on-disk values. 870 */ 871 __xfs_sb_from_disk(&sb, dsb, false); 872 error = xfs_validate_sb_common(mp, bp, &sb); 873 if (error) 874 goto out_error; 875 error = xfs_validate_sb_read(mp, &sb); 876 877 out_error: 878 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 879 xfs_verifier_error(bp, error, __this_address); 880 else if (error) 881 xfs_buf_ioerror(bp, error); 882 } 883 884 /* 885 * We may be probed for a filesystem match, so we may not want to emit 886 * messages when the superblock buffer is not actually an XFS superblock. 887 * If we find an XFS superblock, then run a normal, noisy mount because we are 888 * really going to mount it and want to know about errors. 889 */ 890 static void 891 xfs_sb_quiet_read_verify( 892 struct xfs_buf *bp) 893 { 894 struct xfs_dsb *dsb = bp->b_addr; 895 896 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 897 /* XFS filesystem, verify noisily! */ 898 xfs_sb_read_verify(bp); 899 return; 900 } 901 /* quietly fail */ 902 xfs_buf_ioerror(bp, -EWRONGFS); 903 } 904 905 static void 906 xfs_sb_write_verify( 907 struct xfs_buf *bp) 908 { 909 struct xfs_sb sb; 910 struct xfs_mount *mp = bp->b_mount; 911 struct xfs_buf_log_item *bip = bp->b_log_item; 912 struct xfs_dsb *dsb = bp->b_addr; 913 int error; 914 915 /* 916 * Check all the superblock fields. Don't byteswap the xquota flags 917 * because _verify_common checks the on-disk values. 918 */ 919 __xfs_sb_from_disk(&sb, dsb, false); 920 error = xfs_validate_sb_common(mp, bp, &sb); 921 if (error) 922 goto out_error; 923 error = xfs_validate_sb_write(mp, bp, &sb); 924 if (error) 925 goto out_error; 926 927 if (!xfs_sb_is_v5(&sb)) 928 return; 929 930 if (bip) 931 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 932 933 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 934 return; 935 936 out_error: 937 xfs_verifier_error(bp, error, __this_address); 938 } 939 940 const struct xfs_buf_ops xfs_sb_buf_ops = { 941 .name = "xfs_sb", 942 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 943 .verify_read = xfs_sb_read_verify, 944 .verify_write = xfs_sb_write_verify, 945 }; 946 947 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 948 .name = "xfs_sb_quiet", 949 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 950 .verify_read = xfs_sb_quiet_read_verify, 951 .verify_write = xfs_sb_write_verify, 952 }; 953 954 /* 955 * xfs_mount_common 956 * 957 * Mount initialization code establishing various mount 958 * fields from the superblock associated with the given 959 * mount structure. 960 * 961 * Inode geometry are calculated in xfs_ialloc_setup_geometry. 962 */ 963 void 964 xfs_sb_mount_common( 965 struct xfs_mount *mp, 966 struct xfs_sb *sbp) 967 { 968 mp->m_agfrotor = 0; 969 atomic_set(&mp->m_agirotor, 0); 970 mp->m_maxagi = mp->m_sb.sb_agcount; 971 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 972 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 973 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 974 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 975 mp->m_blockmask = sbp->sb_blocksize - 1; 976 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 977 mp->m_blockwmask = mp->m_blockwsize - 1; 978 mp->m_rtxblklog = log2_if_power2(sbp->sb_rextsize); 979 mp->m_rtxblkmask = mask64_if_power2(sbp->sb_rextsize); 980 981 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 982 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 983 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 984 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 985 986 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 987 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 988 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 989 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 990 991 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1); 992 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0); 993 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; 994 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; 995 996 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true); 997 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false); 998 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; 999 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; 1000 1001 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 1002 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 1003 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp); 1004 } 1005 1006 /* 1007 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock 1008 * into the superblock buffer to be logged. It does not provide the higher 1009 * level of locking that is needed to protect the in-core superblock from 1010 * concurrent access. 1011 */ 1012 void 1013 xfs_log_sb( 1014 struct xfs_trans *tp) 1015 { 1016 struct xfs_mount *mp = tp->t_mountp; 1017 struct xfs_buf *bp = xfs_trans_getsb(tp); 1018 1019 /* 1020 * Lazy sb counters don't update the in-core superblock so do that now. 1021 * If this is at unmount, the counters will be exactly correct, but at 1022 * any other time they will only be ballpark correct because of 1023 * reservations that have been taken out percpu counters. If we have an 1024 * unclean shutdown, this will be corrected by log recovery rebuilding 1025 * the counters from the AGF block counts. 1026 * 1027 * Do not update sb_frextents here because it is not part of the lazy 1028 * sb counters, despite having a percpu counter. It is always kept 1029 * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas() 1030 * and hence we don't need have to update it here. 1031 */ 1032 if (xfs_has_lazysbcount(mp)) { 1033 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); 1034 mp->m_sb.sb_ifree = min_t(uint64_t, 1035 percpu_counter_sum(&mp->m_ifree), 1036 mp->m_sb.sb_icount); 1037 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); 1038 } 1039 1040 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1041 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 1042 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1); 1043 } 1044 1045 /* 1046 * xfs_sync_sb 1047 * 1048 * Sync the superblock to disk. 1049 * 1050 * Note that the caller is responsible for checking the frozen state of the 1051 * filesystem. This procedure uses the non-blocking transaction allocator and 1052 * thus will allow modifications to a frozen fs. This is required because this 1053 * code can be called during the process of freezing where use of the high-level 1054 * allocator would deadlock. 1055 */ 1056 int 1057 xfs_sync_sb( 1058 struct xfs_mount *mp, 1059 bool wait) 1060 { 1061 struct xfs_trans *tp; 1062 int error; 1063 1064 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 1065 XFS_TRANS_NO_WRITECOUNT, &tp); 1066 if (error) 1067 return error; 1068 1069 xfs_log_sb(tp); 1070 if (wait) 1071 xfs_trans_set_sync(tp); 1072 return xfs_trans_commit(tp); 1073 } 1074 1075 /* 1076 * Update all the secondary superblocks to match the new state of the primary. 1077 * Because we are completely overwriting all the existing fields in the 1078 * secondary superblock buffers, there is no need to read them in from disk. 1079 * Just get a new buffer, stamp it and write it. 1080 * 1081 * The sb buffers need to be cached here so that we serialise against other 1082 * operations that access the secondary superblocks, but we don't want to keep 1083 * them in memory once it is written so we mark it as a one-shot buffer. 1084 */ 1085 int 1086 xfs_update_secondary_sbs( 1087 struct xfs_mount *mp) 1088 { 1089 struct xfs_perag *pag; 1090 xfs_agnumber_t agno = 1; 1091 int saved_error = 0; 1092 int error = 0; 1093 LIST_HEAD (buffer_list); 1094 1095 /* update secondary superblocks. */ 1096 for_each_perag_from(mp, agno, pag) { 1097 struct xfs_buf *bp; 1098 1099 error = xfs_buf_get(mp->m_ddev_targp, 1100 XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR), 1101 XFS_FSS_TO_BB(mp, 1), &bp); 1102 /* 1103 * If we get an error reading or writing alternate superblocks, 1104 * continue. xfs_repair chooses the "best" superblock based 1105 * on most matches; if we break early, we'll leave more 1106 * superblocks un-updated than updated, and xfs_repair may 1107 * pick them over the properly-updated primary. 1108 */ 1109 if (error) { 1110 xfs_warn(mp, 1111 "error allocating secondary superblock for ag %d", 1112 pag->pag_agno); 1113 if (!saved_error) 1114 saved_error = error; 1115 continue; 1116 } 1117 1118 bp->b_ops = &xfs_sb_buf_ops; 1119 xfs_buf_oneshot(bp); 1120 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 1121 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1122 xfs_buf_delwri_queue(bp, &buffer_list); 1123 xfs_buf_relse(bp); 1124 1125 /* don't hold too many buffers at once */ 1126 if (agno % 16) 1127 continue; 1128 1129 error = xfs_buf_delwri_submit(&buffer_list); 1130 if (error) { 1131 xfs_warn(mp, 1132 "write error %d updating a secondary superblock near ag %d", 1133 error, pag->pag_agno); 1134 if (!saved_error) 1135 saved_error = error; 1136 continue; 1137 } 1138 } 1139 error = xfs_buf_delwri_submit(&buffer_list); 1140 if (error) { 1141 xfs_warn(mp, 1142 "write error %d updating a secondary superblock near ag %d", 1143 error, agno); 1144 } 1145 1146 return saved_error ? saved_error : error; 1147 } 1148 1149 /* 1150 * Same behavior as xfs_sync_sb, except that it is always synchronous and it 1151 * also writes the superblock buffer to disk sector 0 immediately. 1152 */ 1153 int 1154 xfs_sync_sb_buf( 1155 struct xfs_mount *mp) 1156 { 1157 struct xfs_trans *tp; 1158 struct xfs_buf *bp; 1159 int error; 1160 1161 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp); 1162 if (error) 1163 return error; 1164 1165 bp = xfs_trans_getsb(tp); 1166 xfs_log_sb(tp); 1167 xfs_trans_bhold(tp, bp); 1168 xfs_trans_set_sync(tp); 1169 error = xfs_trans_commit(tp); 1170 if (error) 1171 goto out; 1172 /* 1173 * write out the sb buffer to get the changes to disk 1174 */ 1175 error = xfs_bwrite(bp); 1176 out: 1177 xfs_buf_relse(bp); 1178 return error; 1179 } 1180 1181 void 1182 xfs_fs_geometry( 1183 struct xfs_mount *mp, 1184 struct xfs_fsop_geom *geo, 1185 int struct_version) 1186 { 1187 struct xfs_sb *sbp = &mp->m_sb; 1188 1189 memset(geo, 0, sizeof(struct xfs_fsop_geom)); 1190 1191 geo->blocksize = sbp->sb_blocksize; 1192 geo->rtextsize = sbp->sb_rextsize; 1193 geo->agblocks = sbp->sb_agblocks; 1194 geo->agcount = sbp->sb_agcount; 1195 geo->logblocks = sbp->sb_logblocks; 1196 geo->sectsize = sbp->sb_sectsize; 1197 geo->inodesize = sbp->sb_inodesize; 1198 geo->imaxpct = sbp->sb_imax_pct; 1199 geo->datablocks = sbp->sb_dblocks; 1200 geo->rtblocks = sbp->sb_rblocks; 1201 geo->rtextents = sbp->sb_rextents; 1202 geo->logstart = sbp->sb_logstart; 1203 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid)); 1204 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid)); 1205 1206 if (struct_version < 2) 1207 return; 1208 1209 geo->sunit = sbp->sb_unit; 1210 geo->swidth = sbp->sb_width; 1211 1212 if (struct_version < 3) 1213 return; 1214 1215 geo->version = XFS_FSOP_GEOM_VERSION; 1216 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 1217 XFS_FSOP_GEOM_FLAGS_DIRV2 | 1218 XFS_FSOP_GEOM_FLAGS_EXTFLG; 1219 if (xfs_has_attr(mp)) 1220 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR; 1221 if (xfs_has_quota(mp)) 1222 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA; 1223 if (xfs_has_align(mp)) 1224 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN; 1225 if (xfs_has_dalign(mp)) 1226 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN; 1227 if (xfs_has_asciici(mp)) 1228 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI; 1229 if (xfs_has_lazysbcount(mp)) 1230 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB; 1231 if (xfs_has_attr2(mp)) 1232 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2; 1233 if (xfs_has_projid32(mp)) 1234 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32; 1235 if (xfs_has_crc(mp)) 1236 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB; 1237 if (xfs_has_ftype(mp)) 1238 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE; 1239 if (xfs_has_finobt(mp)) 1240 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT; 1241 if (xfs_has_sparseinodes(mp)) 1242 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES; 1243 if (xfs_has_rmapbt(mp)) 1244 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT; 1245 if (xfs_has_reflink(mp)) 1246 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK; 1247 if (xfs_has_bigtime(mp)) 1248 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME; 1249 if (xfs_has_inobtcounts(mp)) 1250 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT; 1251 if (xfs_has_sector(mp)) { 1252 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR; 1253 geo->logsectsize = sbp->sb_logsectsize; 1254 } else { 1255 geo->logsectsize = BBSIZE; 1256 } 1257 if (xfs_has_large_extent_counts(mp)) 1258 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64; 1259 geo->rtsectsize = sbp->sb_blocksize; 1260 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp); 1261 1262 if (struct_version < 4) 1263 return; 1264 1265 if (xfs_has_logv2(mp)) 1266 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2; 1267 1268 geo->logsunit = sbp->sb_logsunit; 1269 1270 if (struct_version < 5) 1271 return; 1272 1273 geo->version = XFS_FSOP_GEOM_VERSION_V5; 1274 } 1275 1276 /* Read a secondary superblock. */ 1277 int 1278 xfs_sb_read_secondary( 1279 struct xfs_mount *mp, 1280 struct xfs_trans *tp, 1281 xfs_agnumber_t agno, 1282 struct xfs_buf **bpp) 1283 { 1284 struct xfs_buf *bp; 1285 int error; 1286 1287 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1288 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, 1289 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1290 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops); 1291 if (error) 1292 return error; 1293 xfs_buf_set_ref(bp, XFS_SSB_REF); 1294 *bpp = bp; 1295 return 0; 1296 } 1297 1298 /* Get an uninitialised secondary superblock buffer. */ 1299 int 1300 xfs_sb_get_secondary( 1301 struct xfs_mount *mp, 1302 struct xfs_trans *tp, 1303 xfs_agnumber_t agno, 1304 struct xfs_buf **bpp) 1305 { 1306 struct xfs_buf *bp; 1307 int error; 1308 1309 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1310 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, 1311 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1312 XFS_FSS_TO_BB(mp, 1), 0, &bp); 1313 if (error) 1314 return error; 1315 bp->b_ops = &xfs_sb_buf_ops; 1316 xfs_buf_oneshot(bp); 1317 *bpp = bp; 1318 return 0; 1319 } 1320 1321 /* 1322 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, 1323 * so users won't be confused by values in error messages. 1324 */ 1325 bool 1326 xfs_validate_stripe_geometry( 1327 struct xfs_mount *mp, 1328 __s64 sunit, 1329 __s64 swidth, 1330 int sectorsize, 1331 bool silent) 1332 { 1333 if (swidth > INT_MAX) { 1334 if (!silent) 1335 xfs_notice(mp, 1336 "stripe width (%lld) is too large", swidth); 1337 return false; 1338 } 1339 1340 if (sunit > swidth) { 1341 if (!silent) 1342 xfs_notice(mp, 1343 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth); 1344 return false; 1345 } 1346 1347 if (sectorsize && (int)sunit % sectorsize) { 1348 if (!silent) 1349 xfs_notice(mp, 1350 "stripe unit (%lld) must be a multiple of the sector size (%d)", 1351 sunit, sectorsize); 1352 return false; 1353 } 1354 1355 if (sunit && !swidth) { 1356 if (!silent) 1357 xfs_notice(mp, 1358 "invalid stripe unit (%lld) and stripe width of 0", sunit); 1359 return false; 1360 } 1361 1362 if (!sunit && swidth) { 1363 if (!silent) 1364 xfs_notice(mp, 1365 "invalid stripe width (%lld) and stripe unit of 0", swidth); 1366 return false; 1367 } 1368 1369 if (sunit && (int)swidth % (int)sunit) { 1370 if (!silent) 1371 xfs_notice(mp, 1372 "stripe width (%lld) must be a multiple of the stripe unit (%lld)", 1373 swidth, sunit); 1374 return false; 1375 } 1376 return true; 1377 } 1378