fs/xfs/libxfs/xfs_sb.c

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