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_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
 979         mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
 980         mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
 981         mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
 982         mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
 983
 984         mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
 985         mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
 986         mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
 987         mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
 988
 989         mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1);
 990         mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0);
 991         mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
 992         mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
 993
 994         mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true);
 995         mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false);
 996         mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
 997         mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
 998
 999         mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
1000         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
1001         mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
1002 }
1003
1004 /*
1005  * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
1006  * into the superblock buffer to be logged.  It does not provide the higher
1007  * level of locking that is needed to protect the in-core superblock from
1008  * concurrent access.
1009  */
1010 void
1011 xfs_log_sb(
1012         struct xfs_trans        *tp)
1013 {
1014         struct xfs_mount        *mp = tp->t_mountp;
1015         struct xfs_buf          *bp = xfs_trans_getsb(tp);
1016
1017         /*
1018          * Lazy sb counters don't update the in-core superblock so do that now.
1019          * If this is at unmount, the counters will be exactly correct, but at
1020          * any other time they will only be ballpark correct because of
1021          * reservations that have been taken out percpu counters. If we have an
1022          * unclean shutdown, this will be corrected by log recovery rebuilding
1023          * the counters from the AGF block counts.
1024          *
1025          * Do not update sb_frextents here because it is not part of the lazy
1026          * sb counters, despite having a percpu counter. It is always kept
1027          * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas()
1028          * and hence we don't need have to update it here.
1029          */
1030         if (xfs_has_lazysbcount(mp)) {
1031                 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
1032                 mp->m_sb.sb_ifree = min_t(uint64_t,
1033                                 percpu_counter_sum(&mp->m_ifree),
1034                                 mp->m_sb.sb_icount);
1035                 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1036         }
1037
1038         xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
1039         xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
1040         xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
1041 }
1042
1043 /*
1044  * xfs_sync_sb
1045  *
1046  * Sync the superblock to disk.
1047  *
1048  * Note that the caller is responsible for checking the frozen state of the
1049  * filesystem. This procedure uses the non-blocking transaction allocator and
1050  * thus will allow modifications to a frozen fs. This is required because this
1051  * code can be called during the process of freezing where use of the high-level
1052  * allocator would deadlock.
1053  */
1054 int
1055 xfs_sync_sb(
1056         struct xfs_mount        *mp,
1057         bool                    wait)
1058 {
1059         struct xfs_trans        *tp;
1060         int                     error;
1061
1062         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
1063                         XFS_TRANS_NO_WRITECOUNT, &tp);
1064         if (error)
1065                 return error;
1066
1067         xfs_log_sb(tp);
1068         if (wait)
1069                 xfs_trans_set_sync(tp);
1070         return xfs_trans_commit(tp);
1071 }
1072
1073 /*
1074  * Update all the secondary superblocks to match the new state of the primary.
1075  * Because we are completely overwriting all the existing fields in the
1076  * secondary superblock buffers, there is no need to read them in from disk.
1077  * Just get a new buffer, stamp it and write it.
1078  *
1079  * The sb buffers need to be cached here so that we serialise against other
1080  * operations that access the secondary superblocks, but we don't want to keep
1081  * them in memory once it is written so we mark it as a one-shot buffer.
1082  */
1083 int
1084 xfs_update_secondary_sbs(
1085         struct xfs_mount        *mp)
1086 {
1087         struct xfs_perag        *pag;
1088         xfs_agnumber_t          agno = 1;
1089         int                     saved_error = 0;
1090         int                     error = 0;
1091         LIST_HEAD               (buffer_list);
1092
1093         /* update secondary superblocks. */
1094         for_each_perag_from(mp, agno, pag) {
1095                 struct xfs_buf          *bp;
1096
1097                 error = xfs_buf_get(mp->m_ddev_targp,
1098                                  XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR),
1099                                  XFS_FSS_TO_BB(mp, 1), &bp);
1100                 /*
1101                  * If we get an error reading or writing alternate superblocks,
1102                  * continue.  xfs_repair chooses the "best" superblock based
1103                  * on most matches; if we break early, we'll leave more
1104                  * superblocks un-updated than updated, and xfs_repair may
1105                  * pick them over the properly-updated primary.
1106                  */
1107                 if (error) {
1108                         xfs_warn(mp,
1109                 "error allocating secondary superblock for ag %d",
1110                                 pag->pag_agno);
1111                         if (!saved_error)
1112                                 saved_error = error;
1113                         continue;
1114                 }
1115
1116                 bp->b_ops = &xfs_sb_buf_ops;
1117                 xfs_buf_oneshot(bp);
1118                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
1119                 xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
1120                 xfs_buf_delwri_queue(bp, &buffer_list);
1121                 xfs_buf_relse(bp);
1122
1123                 /* don't hold too many buffers at once */
1124                 if (agno % 16)
1125                         continue;
1126
1127                 error = xfs_buf_delwri_submit(&buffer_list);
1128                 if (error) {
1129                         xfs_warn(mp,
1130                 "write error %d updating a secondary superblock near ag %d",
1131                                 error, pag->pag_agno);
1132                         if (!saved_error)
1133                                 saved_error = error;
1134                         continue;
1135                 }
1136         }
1137         error = xfs_buf_delwri_submit(&buffer_list);
1138         if (error) {
1139                 xfs_warn(mp,
1140                 "write error %d updating a secondary superblock near ag %d",
1141                         error, agno);
1142         }
1143
1144         return saved_error ? saved_error : error;
1145 }
1146
1147 /*
1148  * Same behavior as xfs_sync_sb, except that it is always synchronous and it
1149  * also writes the superblock buffer to disk sector 0 immediately.
1150  */
1151 int
1152 xfs_sync_sb_buf(
1153         struct xfs_mount        *mp)
1154 {
1155         struct xfs_trans        *tp;
1156         struct xfs_buf          *bp;
1157         int                     error;
1158
1159         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
1160         if (error)
1161                 return error;
1162
1163         bp = xfs_trans_getsb(tp);
1164         xfs_log_sb(tp);
1165         xfs_trans_bhold(tp, bp);
1166         xfs_trans_set_sync(tp);
1167         error = xfs_trans_commit(tp);
1168         if (error)
1169                 goto out;
1170         /*
1171          * write out the sb buffer to get the changes to disk
1172          */
1173         error = xfs_bwrite(bp);
1174 out:
1175         xfs_buf_relse(bp);
1176         return error;
1177 }
1178
1179 void
1180 xfs_fs_geometry(
1181         struct xfs_mount        *mp,
1182         struct xfs_fsop_geom    *geo,
1183         int                     struct_version)
1184 {
1185         struct xfs_sb           *sbp = &mp->m_sb;
1186
1187         memset(geo, 0, sizeof(struct xfs_fsop_geom));
1188
1189         geo->blocksize = sbp->sb_blocksize;
1190         geo->rtextsize = sbp->sb_rextsize;
1191         geo->agblocks = sbp->sb_agblocks;
1192         geo->agcount = sbp->sb_agcount;
1193         geo->logblocks = sbp->sb_logblocks;
1194         geo->sectsize = sbp->sb_sectsize;
1195         geo->inodesize = sbp->sb_inodesize;
1196         geo->imaxpct = sbp->sb_imax_pct;
1197         geo->datablocks = sbp->sb_dblocks;
1198         geo->rtblocks = sbp->sb_rblocks;
1199         geo->rtextents = sbp->sb_rextents;
1200         geo->logstart = sbp->sb_logstart;
1201         BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
1202         memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
1203
1204         if (struct_version < 2)
1205                 return;
1206
1207         geo->sunit = sbp->sb_unit;
1208         geo->swidth = sbp->sb_width;
1209
1210         if (struct_version < 3)
1211                 return;
1212
1213         geo->version = XFS_FSOP_GEOM_VERSION;
1214         geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
1215                      XFS_FSOP_GEOM_FLAGS_DIRV2 |
1216                      XFS_FSOP_GEOM_FLAGS_EXTFLG;
1217         if (xfs_has_attr(mp))
1218                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
1219         if (xfs_has_quota(mp))
1220                 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
1221         if (xfs_has_align(mp))
1222                 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
1223         if (xfs_has_dalign(mp))
1224                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
1225         if (xfs_has_asciici(mp))
1226                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
1227         if (xfs_has_lazysbcount(mp))
1228                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
1229         if (xfs_has_attr2(mp))
1230                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
1231         if (xfs_has_projid32(mp))
1232                 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
1233         if (xfs_has_crc(mp))
1234                 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
1235         if (xfs_has_ftype(mp))
1236                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
1237         if (xfs_has_finobt(mp))
1238                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
1239         if (xfs_has_sparseinodes(mp))
1240                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
1241         if (xfs_has_rmapbt(mp))
1242                 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
1243         if (xfs_has_reflink(mp))
1244                 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
1245         if (xfs_has_bigtime(mp))
1246                 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME;
1247         if (xfs_has_inobtcounts(mp))
1248                 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT;
1249         if (xfs_has_sector(mp)) {
1250                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
1251                 geo->logsectsize = sbp->sb_logsectsize;
1252         } else {
1253                 geo->logsectsize = BBSIZE;
1254         }
1255         if (xfs_has_large_extent_counts(mp))
1256                 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64;
1257         geo->rtsectsize = sbp->sb_blocksize;
1258         geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
1259
1260         if (struct_version < 4)
1261                 return;
1262
1263         if (xfs_has_logv2(mp))
1264                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
1265
1266         geo->logsunit = sbp->sb_logsunit;
1267
1268         if (struct_version < 5)
1269                 return;
1270
1271         geo->version = XFS_FSOP_GEOM_VERSION_V5;
1272 }
1273
1274 /* Read a secondary superblock. */
1275 int
1276 xfs_sb_read_secondary(
1277         struct xfs_mount        *mp,
1278         struct xfs_trans        *tp,
1279         xfs_agnumber_t          agno,
1280         struct xfs_buf          **bpp)
1281 {
1282         struct xfs_buf          *bp;
1283         int                     error;
1284
1285         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1286         error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1287                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1288                         XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
1289         if (error)
1290                 return error;
1291         xfs_buf_set_ref(bp, XFS_SSB_REF);
1292         *bpp = bp;
1293         return 0;
1294 }
1295
1296 /* Get an uninitialised secondary superblock buffer. */
1297 int
1298 xfs_sb_get_secondary(
1299         struct xfs_mount        *mp,
1300         struct xfs_trans        *tp,
1301         xfs_agnumber_t          agno,
1302         struct xfs_buf          **bpp)
1303 {
1304         struct xfs_buf          *bp;
1305         int                     error;
1306
1307         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1308         error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1309                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1310                         XFS_FSS_TO_BB(mp, 1), 0, &bp);
1311         if (error)
1312                 return error;
1313         bp->b_ops = &xfs_sb_buf_ops;
1314         xfs_buf_oneshot(bp);
1315         *bpp = bp;
1316         return 0;
1317 }
1318
1319 /*
1320  * sunit, swidth, sectorsize(optional with 0) should be all in bytes,
1321  * so users won't be confused by values in error messages.
1322  */
1323 bool
1324 xfs_validate_stripe_geometry(
1325         struct xfs_mount        *mp,
1326         __s64                   sunit,
1327         __s64                   swidth,
1328         int                     sectorsize,
1329         bool                    silent)
1330 {
1331         if (swidth > INT_MAX) {
1332                 if (!silent)
1333                         xfs_notice(mp,
1334 "stripe width (%lld) is too large", swidth);
1335                 return false;
1336         }
1337
1338         if (sunit > swidth) {
1339                 if (!silent)
1340                         xfs_notice(mp,
1341 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth);
1342                 return false;
1343         }
1344
1345         if (sectorsize && (int)sunit % sectorsize) {
1346                 if (!silent)
1347                         xfs_notice(mp,
1348 "stripe unit (%lld) must be a multiple of the sector size (%d)",
1349                                    sunit, sectorsize);
1350                 return false;
1351         }
1352
1353         if (sunit && !swidth) {
1354                 if (!silent)
1355                         xfs_notice(mp,
1356 "invalid stripe unit (%lld) and stripe width of 0", sunit);
1357                 return false;
1358         }
1359
1360         if (!sunit && swidth) {
1361                 if (!silent)
1362                         xfs_notice(mp,
1363 "invalid stripe width (%lld) and stripe unit of 0", swidth);
1364                 return false;
1365         }
1366
1367         if (sunit && (int)swidth % (int)sunit) {
1368                 if (!silent)
1369                         xfs_notice(mp,
1370 "stripe width (%lld) must be a multiple of the stripe unit (%lld)",
1371                                    swidth, sunit);
1372                 return false;
1373         }
1374         return true;
1375 }