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 /* Check all the superblock fields we care about when reading one in. */
  34 STATIC int
  35 xfs_validate_sb_read(
  36         struct xfs_mount        *mp,
  37         struct xfs_sb           *sbp)
  38 {
  39         if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
  40                 return 0;
  41
  42         /*
  43          * Version 5 superblock feature mask validation. Reject combinations
  44          * the kernel cannot support up front before checking anything else.
  45          */
  46         if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
  47                 xfs_warn(mp,
  48 "Superblock has unknown compatible features (0x%x) enabled.",
  49                         (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
  50                 xfs_warn(mp,
  51 "Using a more recent kernel is recommended.");
  52         }
  53
  54         if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
  55                 xfs_alert(mp,
  56 "Superblock has unknown read-only compatible features (0x%x) enabled.",
  57                         (sbp->sb_features_ro_compat &
  58                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
  59                 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
  60                         xfs_warn(mp,
  61 "Attempted to mount read-only compatible filesystem read-write.");
  62                         xfs_warn(mp,
  63 "Filesystem can only be safely mounted read only.");
  64
  65                         return -EINVAL;
  66                 }
  67         }
  68         if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
  69                 xfs_warn(mp,
  70 "Superblock has unknown incompatible features (0x%x) enabled.",
  71                         (sbp->sb_features_incompat &
  72                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN));
  73                 xfs_warn(mp,
  74 "Filesystem cannot be safely mounted by this kernel.");
  75                 return -EINVAL;
  76         }
  77
  78         return 0;
  79 }
  80
  81 /* Check all the superblock fields we care about when writing one out. */
  82 STATIC int
  83 xfs_validate_sb_write(
  84         struct xfs_mount        *mp,
  85         struct xfs_buf          *bp,
  86         struct xfs_sb           *sbp)
  87 {
  88         /*
  89          * Carry out additional sb summary counter sanity checks when we write
  90          * the superblock.  We skip this in the read validator because there
  91          * could be newer superblocks in the log and if the values are garbage
  92          * even after replay we'll recalculate them at the end of log mount.
  93          *
  94          * mkfs has traditionally written zeroed counters to inprogress and
  95          * secondary superblocks, so allow this usage to continue because
  96          * we never read counters from such superblocks.
  97          */
  98         if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
  99             (sbp->sb_fdblocks > sbp->sb_dblocks ||
 100              !xfs_verify_icount(mp, sbp->sb_icount) ||
 101              sbp->sb_ifree > sbp->sb_icount)) {
 102                 xfs_warn(mp, "SB summary counter sanity check failed");
 103                 return -EFSCORRUPTED;
 104         }
 105
 106         if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
 107                 return 0;
 108
 109         /*
 110          * Version 5 superblock feature mask validation. Reject combinations
 111          * the kernel cannot support since we checked for unsupported bits in
 112          * the read verifier, which means that memory is corrupt.
 113          */
 114         if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
 115                 xfs_warn(mp,
 116 "Corruption detected in superblock compatible features (0x%x)!",
 117                         (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
 118                 return -EFSCORRUPTED;
 119         }
 120
 121         if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
 122                 xfs_alert(mp,
 123 "Corruption detected in superblock read-only compatible features (0x%x)!",
 124                         (sbp->sb_features_ro_compat &
 125                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
 126                 return -EFSCORRUPTED;
 127         }
 128         if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
 129                 xfs_warn(mp,
 130 "Corruption detected in superblock incompatible features (0x%x)!",
 131                         (sbp->sb_features_incompat &
 132                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN));
 133                 return -EFSCORRUPTED;
 134         }
 135         if (xfs_sb_has_incompat_log_feature(sbp,
 136                         XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
 137                 xfs_warn(mp,
 138 "Corruption detected in superblock incompatible log features (0x%x)!",
 139                         (sbp->sb_features_log_incompat &
 140                                         XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
 141                 return -EFSCORRUPTED;
 142         }
 143
 144         /*
 145          * We can't read verify the sb LSN because the read verifier is called
 146          * before the log is allocated and processed. We know the log is set up
 147          * before write verifier calls, so check it here.
 148          */
 149         if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
 150                 return -EFSCORRUPTED;
 151
 152         return 0;
 153 }
 154
 155 /* Check the validity of the SB. */
 156 STATIC int
 157 xfs_validate_sb_common(
 158         struct xfs_mount        *mp,
 159         struct xfs_buf          *bp,
 160         struct xfs_sb           *sbp)
 161 {
 162         struct xfs_dsb          *dsb = bp->b_addr;
 163         uint32_t                agcount = 0;
 164         uint32_t                rem;
 165
 166         if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
 167                 xfs_warn(mp, "bad magic number");
 168                 return -EWRONGFS;
 169         }
 170
 171         if (!xfs_sb_good_version(sbp)) {
 172                 xfs_warn(mp, "bad version");
 173                 return -EWRONGFS;
 174         }
 175
 176         if (xfs_sb_version_has_pquotino(sbp)) {
 177                 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
 178                         xfs_notice(mp,
 179                            "Version 5 of Super block has XFS_OQUOTA bits.");
 180                         return -EFSCORRUPTED;
 181                 }
 182         } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
 183                                 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
 184                         xfs_notice(mp,
 185 "Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits.");
 186                         return -EFSCORRUPTED;
 187         }
 188
 189         /*
 190          * Full inode chunks must be aligned to inode chunk size when
 191          * sparse inodes are enabled to support the sparse chunk
 192          * allocation algorithm and prevent overlapping inode records.
 193          */
 194         if (xfs_sb_version_hassparseinodes(sbp)) {
 195                 uint32_t        align;
 196
 197                 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
 198                                 >> sbp->sb_blocklog;
 199                 if (sbp->sb_inoalignmt != align) {
 200                         xfs_warn(mp,
 201 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
 202                                  sbp->sb_inoalignmt, align);
 203                         return -EINVAL;
 204                 }
 205         }
 206
 207         if (unlikely(
 208             sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
 209                 xfs_warn(mp,
 210                 "filesystem is marked as having an external log; "
 211                 "specify logdev on the mount command line.");
 212                 return -EINVAL;
 213         }
 214
 215         if (unlikely(
 216             sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
 217                 xfs_warn(mp,
 218                 "filesystem is marked as having an internal log; "
 219                 "do not specify logdev on the mount command line.");
 220                 return -EINVAL;
 221         }
 222
 223         /* Compute agcount for this number of dblocks and agblocks */
 224         if (sbp->sb_agblocks) {
 225                 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
 226                 if (rem)
 227                         agcount++;
 228         }
 229
 230         /*
 231          * More sanity checking.  Most of these were stolen directly from
 232          * xfs_repair.
 233          */
 234         if (unlikely(
 235             sbp->sb_agcount <= 0                                        ||
 236             sbp->sb_sectsize < XFS_MIN_SECTORSIZE                       ||
 237             sbp->sb_sectsize > XFS_MAX_SECTORSIZE                       ||
 238             sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG                    ||
 239             sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG                    ||
 240             sbp->sb_sectsize != (1 << sbp->sb_sectlog)                  ||
 241             sbp->sb_blocksize < XFS_MIN_BLOCKSIZE                       ||
 242             sbp->sb_blocksize > XFS_MAX_BLOCKSIZE                       ||
 243             sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG                    ||
 244             sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG                    ||
 245             sbp->sb_blocksize != (1 << sbp->sb_blocklog)                ||
 246             sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
 247             sbp->sb_inodesize < XFS_DINODE_MIN_SIZE                     ||
 248             sbp->sb_inodesize > XFS_DINODE_MAX_SIZE                     ||
 249             sbp->sb_inodelog < XFS_DINODE_MIN_LOG                       ||
 250             sbp->sb_inodelog > XFS_DINODE_MAX_LOG                       ||
 251             sbp->sb_inodesize != (1 << sbp->sb_inodelog)                ||
 252             sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE                    ||
 253             sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
 254             XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES       ||
 255             XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES       ||
 256             sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
 257             agcount == 0 || agcount != sbp->sb_agcount                  ||
 258             (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog)   ||
 259             (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE)  ||
 260             (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)  ||
 261             (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */)    ||
 262             sbp->sb_dblocks == 0                                        ||
 263             sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp)                      ||
 264             sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp)                      ||
 265             sbp->sb_shared_vn != 0)) {
 266                 xfs_notice(mp, "SB sanity check failed");
 267                 return -EFSCORRUPTED;
 268         }
 269
 270         /* Validate the realtime geometry; stolen from xfs_repair */
 271         if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE ||
 272             sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) {
 273                 xfs_notice(mp,
 274                         "realtime extent sanity check failed");
 275                 return -EFSCORRUPTED;
 276         }
 277
 278         if (sbp->sb_rblocks == 0) {
 279                 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 ||
 280                     sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) {
 281                         xfs_notice(mp,
 282                                 "realtime zeroed geometry check failed");
 283                         return -EFSCORRUPTED;
 284                 }
 285         } else {
 286                 uint64_t        rexts;
 287                 uint64_t        rbmblocks;
 288
 289                 rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize);
 290                 rbmblocks = howmany_64(sbp->sb_rextents,
 291                                        NBBY * sbp->sb_blocksize);
 292
 293                 if (sbp->sb_rextents != rexts ||
 294                     sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) ||
 295                     sbp->sb_rbmblocks != rbmblocks) {
 296                         xfs_notice(mp,
 297                                 "realtime geometry sanity check failed");
 298                         return -EFSCORRUPTED;
 299                 }
 300         }
 301
 302         /*
 303          * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign)
 304          * would imply the image is corrupted.
 305          */
 306         if (!!sbp->sb_unit ^ xfs_sb_version_hasdalign(sbp)) {
 307                 xfs_notice(mp, "SB stripe alignment sanity check failed");
 308                 return -EFSCORRUPTED;
 309         }
 310
 311         if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit),
 312                         XFS_FSB_TO_B(mp, sbp->sb_width), 0, false))
 313                 return -EFSCORRUPTED;
 314
 315         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 316             sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
 317                 xfs_notice(mp, "v5 SB sanity check failed");
 318                 return -EFSCORRUPTED;
 319         }
 320
 321         /*
 322          * Currently only very few inode sizes are supported.
 323          */
 324         switch (sbp->sb_inodesize) {
 325         case 256:
 326         case 512:
 327         case 1024:
 328         case 2048:
 329                 break;
 330         default:
 331                 xfs_warn(mp, "inode size of %d bytes not supported",
 332                                 sbp->sb_inodesize);
 333                 return -ENOSYS;
 334         }
 335
 336         return 0;
 337 }
 338
 339 void
 340 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
 341 {
 342         /*
 343          * older mkfs doesn't initialize quota inodes to NULLFSINO. This
 344          * leads to in-core values having two different values for a quota
 345          * inode to be invalid: 0 and NULLFSINO. Change it to a single value
 346          * NULLFSINO.
 347          *
 348          * Note that this change affect only the in-core values. These
 349          * values are not written back to disk unless any quota information
 350          * is written to the disk. Even in that case, sb_pquotino field is
 351          * not written to disk unless the superblock supports pquotino.
 352          */
 353         if (sbp->sb_uquotino == 0)
 354                 sbp->sb_uquotino = NULLFSINO;
 355         if (sbp->sb_gquotino == 0)
 356                 sbp->sb_gquotino = NULLFSINO;
 357         if (sbp->sb_pquotino == 0)
 358                 sbp->sb_pquotino = NULLFSINO;
 359
 360         /*
 361          * We need to do these manipilations only if we are working
 362          * with an older version of on-disk superblock.
 363          */
 364         if (xfs_sb_version_has_pquotino(sbp))
 365                 return;
 366
 367         if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
 368                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
 369                                         XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
 370         if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
 371                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
 372                                         XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
 373         sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
 374
 375         if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
 376             sbp->sb_gquotino != NULLFSINO)  {
 377                 /*
 378                  * In older version of superblock, on-disk superblock only
 379                  * has sb_gquotino, and in-core superblock has both sb_gquotino
 380                  * and sb_pquotino. But, only one of them is supported at any
 381                  * point of time. So, if PQUOTA is set in disk superblock,
 382                  * copy over sb_gquotino to sb_pquotino.  The NULLFSINO test
 383                  * above is to make sure we don't do this twice and wipe them
 384                  * both out!
 385                  */
 386                 sbp->sb_pquotino = sbp->sb_gquotino;
 387                 sbp->sb_gquotino = NULLFSINO;
 388         }
 389 }
 390
 391 static void
 392 __xfs_sb_from_disk(
 393         struct xfs_sb   *to,
 394         xfs_dsb_t       *from,
 395         bool            convert_xquota)
 396 {
 397         to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
 398         to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
 399         to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
 400         to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
 401         to->sb_rextents = be64_to_cpu(from->sb_rextents);
 402         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
 403         to->sb_logstart = be64_to_cpu(from->sb_logstart);
 404         to->sb_rootino = be64_to_cpu(from->sb_rootino);
 405         to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
 406         to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
 407         to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
 408         to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
 409         to->sb_agcount = be32_to_cpu(from->sb_agcount);
 410         to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
 411         to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
 412         to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
 413         to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
 414         to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
 415         to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
 416         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
 417         to->sb_blocklog = from->sb_blocklog;
 418         to->sb_sectlog = from->sb_sectlog;
 419         to->sb_inodelog = from->sb_inodelog;
 420         to->sb_inopblog = from->sb_inopblog;
 421         to->sb_agblklog = from->sb_agblklog;
 422         to->sb_rextslog = from->sb_rextslog;
 423         to->sb_inprogress = from->sb_inprogress;
 424         to->sb_imax_pct = from->sb_imax_pct;
 425         to->sb_icount = be64_to_cpu(from->sb_icount);
 426         to->sb_ifree = be64_to_cpu(from->sb_ifree);
 427         to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
 428         to->sb_frextents = be64_to_cpu(from->sb_frextents);
 429         to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
 430         to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
 431         to->sb_qflags = be16_to_cpu(from->sb_qflags);
 432         to->sb_flags = from->sb_flags;
 433         to->sb_shared_vn = from->sb_shared_vn;
 434         to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
 435         to->sb_unit = be32_to_cpu(from->sb_unit);
 436         to->sb_width = be32_to_cpu(from->sb_width);
 437         to->sb_dirblklog = from->sb_dirblklog;
 438         to->sb_logsectlog = from->sb_logsectlog;
 439         to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
 440         to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
 441         to->sb_features2 = be32_to_cpu(from->sb_features2);
 442         to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
 443         to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
 444         to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
 445         to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
 446         to->sb_features_log_incompat =
 447                                 be32_to_cpu(from->sb_features_log_incompat);
 448         /* crc is only used on disk, not in memory; just init to 0 here. */
 449         to->sb_crc = 0;
 450         to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
 451         to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
 452         to->sb_lsn = be64_to_cpu(from->sb_lsn);
 453         /*
 454          * sb_meta_uuid is only on disk if it differs from sb_uuid and the
 455          * feature flag is set; if not set we keep it only in memory.
 456          */
 457         if (xfs_sb_version_hasmetauuid(to))
 458                 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
 459         else
 460                 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
 461         /* Convert on-disk flags to in-memory flags? */
 462         if (convert_xquota)
 463                 xfs_sb_quota_from_disk(to);
 464 }
 465
 466 void
 467 xfs_sb_from_disk(
 468         struct xfs_sb   *to,
 469         xfs_dsb_t       *from)
 470 {
 471         __xfs_sb_from_disk(to, from, true);
 472 }
 473
 474 static void
 475 xfs_sb_quota_to_disk(
 476         struct xfs_dsb  *to,
 477         struct xfs_sb   *from)
 478 {
 479         uint16_t        qflags = from->sb_qflags;
 480
 481         to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
 482         if (xfs_sb_version_has_pquotino(from)) {
 483                 to->sb_qflags = cpu_to_be16(from->sb_qflags);
 484                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
 485                 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
 486                 return;
 487         }
 488
 489         /*
 490          * The in-core version of sb_qflags do not have XFS_OQUOTA_*
 491          * flags, whereas the on-disk version does.  So, convert incore
 492          * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
 493          */
 494         qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
 495                         XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
 496
 497         if (from->sb_qflags &
 498                         (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
 499                 qflags |= XFS_OQUOTA_ENFD;
 500         if (from->sb_qflags &
 501                         (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
 502                 qflags |= XFS_OQUOTA_CHKD;
 503         to->sb_qflags = cpu_to_be16(qflags);
 504
 505         /*
 506          * GQUOTINO and PQUOTINO cannot be used together in versions
 507          * of superblock that do not have pquotino. from->sb_flags
 508          * tells us which quota is active and should be copied to
 509          * disk. If neither are active, we should NULL the inode.
 510          *
 511          * In all cases, the separate pquotino must remain 0 because it
 512          * is beyond the "end" of the valid non-pquotino superblock.
 513          */
 514         if (from->sb_qflags & XFS_GQUOTA_ACCT)
 515                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
 516         else if (from->sb_qflags & XFS_PQUOTA_ACCT)
 517                 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
 518         else {
 519                 /*
 520                  * We can't rely on just the fields being logged to tell us
 521                  * that it is safe to write NULLFSINO - we should only do that
 522                  * if quotas are not actually enabled. Hence only write
 523                  * NULLFSINO if both in-core quota inodes are NULL.
 524                  */
 525                 if (from->sb_gquotino == NULLFSINO &&
 526                     from->sb_pquotino == NULLFSINO)
 527                         to->sb_gquotino = cpu_to_be64(NULLFSINO);
 528         }
 529
 530         to->sb_pquotino = 0;
 531 }
 532
 533 void
 534 xfs_sb_to_disk(
 535         struct xfs_dsb  *to,
 536         struct xfs_sb   *from)
 537 {
 538         xfs_sb_quota_to_disk(to, from);
 539
 540         to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
 541         to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
 542         to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
 543         to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
 544         to->sb_rextents = cpu_to_be64(from->sb_rextents);
 545         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
 546         to->sb_logstart = cpu_to_be64(from->sb_logstart);
 547         to->sb_rootino = cpu_to_be64(from->sb_rootino);
 548         to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
 549         to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
 550         to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
 551         to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
 552         to->sb_agcount = cpu_to_be32(from->sb_agcount);
 553         to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
 554         to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
 555         to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
 556         to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
 557         to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
 558         to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
 559         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
 560         to->sb_blocklog = from->sb_blocklog;
 561         to->sb_sectlog = from->sb_sectlog;
 562         to->sb_inodelog = from->sb_inodelog;
 563         to->sb_inopblog = from->sb_inopblog;
 564         to->sb_agblklog = from->sb_agblklog;
 565         to->sb_rextslog = from->sb_rextslog;
 566         to->sb_inprogress = from->sb_inprogress;
 567         to->sb_imax_pct = from->sb_imax_pct;
 568         to->sb_icount = cpu_to_be64(from->sb_icount);
 569         to->sb_ifree = cpu_to_be64(from->sb_ifree);
 570         to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
 571         to->sb_frextents = cpu_to_be64(from->sb_frextents);
 572
 573         to->sb_flags = from->sb_flags;
 574         to->sb_shared_vn = from->sb_shared_vn;
 575         to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
 576         to->sb_unit = cpu_to_be32(from->sb_unit);
 577         to->sb_width = cpu_to_be32(from->sb_width);
 578         to->sb_dirblklog = from->sb_dirblklog;
 579         to->sb_logsectlog = from->sb_logsectlog;
 580         to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
 581         to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
 582
 583         /*
 584          * We need to ensure that bad_features2 always matches features2.
 585          * Hence we enforce that here rather than having to remember to do it
 586          * everywhere else that updates features2.
 587          */
 588         from->sb_bad_features2 = from->sb_features2;
 589         to->sb_features2 = cpu_to_be32(from->sb_features2);
 590         to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
 591
 592         if (xfs_sb_version_hascrc(from)) {
 593                 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
 594                 to->sb_features_ro_compat =
 595                                 cpu_to_be32(from->sb_features_ro_compat);
 596                 to->sb_features_incompat =
 597                                 cpu_to_be32(from->sb_features_incompat);
 598                 to->sb_features_log_incompat =
 599                                 cpu_to_be32(from->sb_features_log_incompat);
 600                 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
 601                 to->sb_lsn = cpu_to_be64(from->sb_lsn);
 602                 if (xfs_sb_version_hasmetauuid(from))
 603                         uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
 604         }
 605 }
 606
 607 /*
 608  * If the superblock has the CRC feature bit set or the CRC field is non-null,
 609  * check that the CRC is valid.  We check the CRC field is non-null because a
 610  * single bit error could clear the feature bit and unused parts of the
 611  * superblock are supposed to be zero. Hence a non-null crc field indicates that
 612  * we've potentially lost a feature bit and we should check it anyway.
 613  *
 614  * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
 615  * last field in V4 secondary superblocks.  So for secondary superblocks,
 616  * we are more forgiving, and ignore CRC failures if the primary doesn't
 617  * indicate that the fs version is V5.
 618  */
 619 static void
 620 xfs_sb_read_verify(
 621         struct xfs_buf          *bp)
 622 {
 623         struct xfs_sb           sb;
 624         struct xfs_mount        *mp = bp->b_mount;
 625         struct xfs_dsb          *dsb = bp->b_addr;
 626         int                     error;
 627
 628         /*
 629          * open code the version check to avoid needing to convert the entire
 630          * superblock from disk order just to check the version number
 631          */
 632         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
 633             (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
 634                                                 XFS_SB_VERSION_5) ||
 635              dsb->sb_crc != 0)) {
 636
 637                 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
 638                         /* Only fail bad secondaries on a known V5 filesystem */
 639                         if (bp->b_bn == XFS_SB_DADDR ||
 640                             xfs_sb_version_hascrc(&mp->m_sb)) {
 641                                 error = -EFSBADCRC;
 642                                 goto out_error;
 643                         }
 644                 }
 645         }
 646
 647         /*
 648          * Check all the superblock fields.  Don't byteswap the xquota flags
 649          * because _verify_common checks the on-disk values.
 650          */
 651         __xfs_sb_from_disk(&sb, dsb, false);
 652         error = xfs_validate_sb_common(mp, bp, &sb);
 653         if (error)
 654                 goto out_error;
 655         error = xfs_validate_sb_read(mp, &sb);
 656
 657 out_error:
 658         if (error == -EFSCORRUPTED || error == -EFSBADCRC)
 659                 xfs_verifier_error(bp, error, __this_address);
 660         else if (error)
 661                 xfs_buf_ioerror(bp, error);
 662 }
 663
 664 /*
 665  * We may be probed for a filesystem match, so we may not want to emit
 666  * messages when the superblock buffer is not actually an XFS superblock.
 667  * If we find an XFS superblock, then run a normal, noisy mount because we are
 668  * really going to mount it and want to know about errors.
 669  */
 670 static void
 671 xfs_sb_quiet_read_verify(
 672         struct xfs_buf  *bp)
 673 {
 674         struct xfs_dsb  *dsb = bp->b_addr;
 675
 676         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
 677                 /* XFS filesystem, verify noisily! */
 678                 xfs_sb_read_verify(bp);
 679                 return;
 680         }
 681         /* quietly fail */
 682         xfs_buf_ioerror(bp, -EWRONGFS);
 683 }
 684
 685 static void
 686 xfs_sb_write_verify(
 687         struct xfs_buf          *bp)
 688 {
 689         struct xfs_sb           sb;
 690         struct xfs_mount        *mp = bp->b_mount;
 691         struct xfs_buf_log_item *bip = bp->b_log_item;
 692         struct xfs_dsb          *dsb = bp->b_addr;
 693         int                     error;
 694
 695         /*
 696          * Check all the superblock fields.  Don't byteswap the xquota flags
 697          * because _verify_common checks the on-disk values.
 698          */
 699         __xfs_sb_from_disk(&sb, dsb, false);
 700         error = xfs_validate_sb_common(mp, bp, &sb);
 701         if (error)
 702                 goto out_error;
 703         error = xfs_validate_sb_write(mp, bp, &sb);
 704         if (error)
 705                 goto out_error;
 706
 707         if (!xfs_sb_version_hascrc(&mp->m_sb))
 708                 return;
 709
 710         if (bip)
 711                 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
 712
 713         xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
 714         return;
 715
 716 out_error:
 717         xfs_verifier_error(bp, error, __this_address);
 718 }
 719
 720 const struct xfs_buf_ops xfs_sb_buf_ops = {
 721         .name = "xfs_sb",
 722         .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
 723         .verify_read = xfs_sb_read_verify,
 724         .verify_write = xfs_sb_write_verify,
 725 };
 726
 727 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
 728         .name = "xfs_sb_quiet",
 729         .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
 730         .verify_read = xfs_sb_quiet_read_verify,
 731         .verify_write = xfs_sb_write_verify,
 732 };
 733
 734 /*
 735  * xfs_mount_common
 736  *
 737  * Mount initialization code establishing various mount
 738  * fields from the superblock associated with the given
 739  * mount structure.
 740  *
 741  * Inode geometry are calculated in xfs_ialloc_setup_geometry.
 742  */
 743 void
 744 xfs_sb_mount_common(
 745         struct xfs_mount        *mp,
 746         struct xfs_sb           *sbp)
 747 {
 748         mp->m_agfrotor = mp->m_agirotor = 0;
 749         mp->m_maxagi = mp->m_sb.sb_agcount;
 750         mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
 751         mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
 752         mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
 753         mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
 754         mp->m_blockmask = sbp->sb_blocksize - 1;
 755         mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
 756         mp->m_blockwmask = mp->m_blockwsize - 1;
 757
 758         mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
 759         mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
 760         mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
 761         mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
 762
 763         mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
 764         mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
 765         mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
 766         mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
 767
 768         mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1);
 769         mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0);
 770         mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
 771         mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
 772
 773         mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true);
 774         mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false);
 775         mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
 776         mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
 777
 778         mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
 779         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
 780         mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
 781 }
 782
 783 /*
 784  * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
 785  * into the superblock buffer to be logged.  It does not provide the higher
 786  * level of locking that is needed to protect the in-core superblock from
 787  * concurrent access.
 788  */
 789 void
 790 xfs_log_sb(
 791         struct xfs_trans        *tp)
 792 {
 793         struct xfs_mount        *mp = tp->t_mountp;
 794         struct xfs_buf          *bp = xfs_trans_getsb(tp);
 795
 796         /*
 797          * Lazy sb counters don't update the in-core superblock so do that now.
 798          * If this is at unmount, the counters will be exactly correct, but at
 799          * any other time they will only be ballpark correct because of
 800          * reservations that have been taken out percpu counters. If we have an
 801          * unclean shutdown, this will be corrected by log recovery rebuilding
 802          * the counters from the AGF block counts.
 803          */
 804         if (xfs_sb_version_haslazysbcount(&mp->m_sb)) {
 805                 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
 806                 mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree);
 807                 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 808         }
 809
 810         xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
 811         xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
 812         xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
 813 }
 814
 815 /*
 816  * xfs_sync_sb
 817  *
 818  * Sync the superblock to disk.
 819  *
 820  * Note that the caller is responsible for checking the frozen state of the
 821  * filesystem. This procedure uses the non-blocking transaction allocator and
 822  * thus will allow modifications to a frozen fs. This is required because this
 823  * code can be called during the process of freezing where use of the high-level
 824  * allocator would deadlock.
 825  */
 826 int
 827 xfs_sync_sb(
 828         struct xfs_mount        *mp,
 829         bool                    wait)
 830 {
 831         struct xfs_trans        *tp;
 832         int                     error;
 833
 834         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
 835                         XFS_TRANS_NO_WRITECOUNT, &tp);
 836         if (error)
 837                 return error;
 838
 839         xfs_log_sb(tp);
 840         if (wait)
 841                 xfs_trans_set_sync(tp);
 842         return xfs_trans_commit(tp);
 843 }
 844
 845 /*
 846  * Update all the secondary superblocks to match the new state of the primary.
 847  * Because we are completely overwriting all the existing fields in the
 848  * secondary superblock buffers, there is no need to read them in from disk.
 849  * Just get a new buffer, stamp it and write it.
 850  *
 851  * The sb buffers need to be cached here so that we serialise against other
 852  * operations that access the secondary superblocks, but we don't want to keep
 853  * them in memory once it is written so we mark it as a one-shot buffer.
 854  */
 855 int
 856 xfs_update_secondary_sbs(
 857         struct xfs_mount        *mp)
 858 {
 859         struct xfs_perag        *pag;
 860         xfs_agnumber_t          agno = 1;
 861         int                     saved_error = 0;
 862         int                     error = 0;
 863         LIST_HEAD               (buffer_list);
 864
 865         /* update secondary superblocks. */
 866         for_each_perag_from(mp, agno, pag) {
 867                 struct xfs_buf          *bp;
 868
 869                 error = xfs_buf_get(mp->m_ddev_targp,
 870                                  XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR),
 871                                  XFS_FSS_TO_BB(mp, 1), &bp);
 872                 /*
 873                  * If we get an error reading or writing alternate superblocks,
 874                  * continue.  xfs_repair chooses the "best" superblock based
 875                  * on most matches; if we break early, we'll leave more
 876                  * superblocks un-updated than updated, and xfs_repair may
 877                  * pick them over the properly-updated primary.
 878                  */
 879                 if (error) {
 880                         xfs_warn(mp,
 881                 "error allocating secondary superblock for ag %d",
 882                                 pag->pag_agno);
 883                         if (!saved_error)
 884                                 saved_error = error;
 885                         continue;
 886                 }
 887
 888                 bp->b_ops = &xfs_sb_buf_ops;
 889                 xfs_buf_oneshot(bp);
 890                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 891                 xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
 892                 xfs_buf_delwri_queue(bp, &buffer_list);
 893                 xfs_buf_relse(bp);
 894
 895                 /* don't hold too many buffers at once */
 896                 if (agno % 16)
 897                         continue;
 898
 899                 error = xfs_buf_delwri_submit(&buffer_list);
 900                 if (error) {
 901                         xfs_warn(mp,
 902                 "write error %d updating a secondary superblock near ag %d",
 903                                 error, pag->pag_agno);
 904                         if (!saved_error)
 905                                 saved_error = error;
 906                         continue;
 907                 }
 908         }
 909         error = xfs_buf_delwri_submit(&buffer_list);
 910         if (error) {
 911                 xfs_warn(mp,
 912                 "write error %d updating a secondary superblock near ag %d",
 913                         error, agno);
 914         }
 915
 916         return saved_error ? saved_error : error;
 917 }
 918
 919 /*
 920  * Same behavior as xfs_sync_sb, except that it is always synchronous and it
 921  * also writes the superblock buffer to disk sector 0 immediately.
 922  */
 923 int
 924 xfs_sync_sb_buf(
 925         struct xfs_mount        *mp)
 926 {
 927         struct xfs_trans        *tp;
 928         struct xfs_buf          *bp;
 929         int                     error;
 930
 931         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
 932         if (error)
 933                 return error;
 934
 935         bp = xfs_trans_getsb(tp);
 936         xfs_log_sb(tp);
 937         xfs_trans_bhold(tp, bp);
 938         xfs_trans_set_sync(tp);
 939         error = xfs_trans_commit(tp);
 940         if (error)
 941                 goto out;
 942         /*
 943          * write out the sb buffer to get the changes to disk
 944          */
 945         error = xfs_bwrite(bp);
 946 out:
 947         xfs_buf_relse(bp);
 948         return error;
 949 }
 950
 951 void
 952 xfs_fs_geometry(
 953         struct xfs_sb           *sbp,
 954         struct xfs_fsop_geom    *geo,
 955         int                     struct_version)
 956 {
 957         memset(geo, 0, sizeof(struct xfs_fsop_geom));
 958
 959         geo->blocksize = sbp->sb_blocksize;
 960         geo->rtextsize = sbp->sb_rextsize;
 961         geo->agblocks = sbp->sb_agblocks;
 962         geo->agcount = sbp->sb_agcount;
 963         geo->logblocks = sbp->sb_logblocks;
 964         geo->sectsize = sbp->sb_sectsize;
 965         geo->inodesize = sbp->sb_inodesize;
 966         geo->imaxpct = sbp->sb_imax_pct;
 967         geo->datablocks = sbp->sb_dblocks;
 968         geo->rtblocks = sbp->sb_rblocks;
 969         geo->rtextents = sbp->sb_rextents;
 970         geo->logstart = sbp->sb_logstart;
 971         BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
 972         memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
 973
 974         if (struct_version < 2)
 975                 return;
 976
 977         geo->sunit = sbp->sb_unit;
 978         geo->swidth = sbp->sb_width;
 979
 980         if (struct_version < 3)
 981                 return;
 982
 983         geo->version = XFS_FSOP_GEOM_VERSION;
 984         geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
 985                      XFS_FSOP_GEOM_FLAGS_DIRV2 |
 986                      XFS_FSOP_GEOM_FLAGS_EXTFLG;
 987         if (xfs_sb_version_hasattr(sbp))
 988                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
 989         if (xfs_sb_version_hasquota(sbp))
 990                 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
 991         if (xfs_sb_version_hasalign(sbp))
 992                 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
 993         if (xfs_sb_version_hasdalign(sbp))
 994                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
 995         if (xfs_sb_version_hassector(sbp))
 996                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
 997         if (xfs_sb_version_hasasciici(sbp))
 998                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
 999         if (xfs_sb_version_haslazysbcount(sbp))
1000                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
1001         if (xfs_sb_version_hasattr2(sbp))
1002                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
1003         if (xfs_sb_version_hasprojid32bit(sbp))
1004                 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
1005         if (xfs_sb_version_hascrc(sbp))
1006                 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
1007         if (xfs_sb_version_hasftype(sbp))
1008                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
1009         if (xfs_sb_version_hasfinobt(sbp))
1010                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
1011         if (xfs_sb_version_hassparseinodes(sbp))
1012                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
1013         if (xfs_sb_version_hasrmapbt(sbp))
1014                 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
1015         if (xfs_sb_version_hasreflink(sbp))
1016                 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
1017         if (xfs_sb_version_hasbigtime(sbp))
1018                 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME;
1019         if (xfs_sb_version_hasinobtcounts(sbp))
1020                 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT;
1021         if (xfs_sb_version_hassector(sbp))
1022                 geo->logsectsize = sbp->sb_logsectsize;
1023         else
1024                 geo->logsectsize = BBSIZE;
1025         geo->rtsectsize = sbp->sb_blocksize;
1026         geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
1027
1028         if (struct_version < 4)
1029                 return;
1030
1031         if (xfs_sb_version_haslogv2(sbp))
1032                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
1033
1034         geo->logsunit = sbp->sb_logsunit;
1035
1036         if (struct_version < 5)
1037                 return;
1038
1039         geo->version = XFS_FSOP_GEOM_VERSION_V5;
1040 }
1041
1042 /* Read a secondary superblock. */
1043 int
1044 xfs_sb_read_secondary(
1045         struct xfs_mount        *mp,
1046         struct xfs_trans        *tp,
1047         xfs_agnumber_t          agno,
1048         struct xfs_buf          **bpp)
1049 {
1050         struct xfs_buf          *bp;
1051         int                     error;
1052
1053         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1054         error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1055                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1056                         XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
1057         if (error)
1058                 return error;
1059         xfs_buf_set_ref(bp, XFS_SSB_REF);
1060         *bpp = bp;
1061         return 0;
1062 }
1063
1064 /* Get an uninitialised secondary superblock buffer. */
1065 int
1066 xfs_sb_get_secondary(
1067         struct xfs_mount        *mp,
1068         struct xfs_trans        *tp,
1069         xfs_agnumber_t          agno,
1070         struct xfs_buf          **bpp)
1071 {
1072         struct xfs_buf          *bp;
1073         int                     error;
1074
1075         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1076         error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1077                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1078                         XFS_FSS_TO_BB(mp, 1), 0, &bp);
1079         if (error)
1080                 return error;
1081         bp->b_ops = &xfs_sb_buf_ops;
1082         xfs_buf_oneshot(bp);
1083         *bpp = bp;
1084         return 0;
1085 }
1086
1087 /*
1088  * sunit, swidth, sectorsize(optional with 0) should be all in bytes,
1089  * so users won't be confused by values in error messages.
1090  */
1091 bool
1092 xfs_validate_stripe_geometry(
1093         struct xfs_mount        *mp,
1094         __s64                   sunit,
1095         __s64                   swidth,
1096         int                     sectorsize,
1097         bool                    silent)
1098 {
1099         if (swidth > INT_MAX) {
1100                 if (!silent)
1101                         xfs_notice(mp,
1102 "stripe width (%lld) is too large", swidth);
1103                 return false;
1104         }
1105
1106         if (sunit > swidth) {
1107                 if (!silent)
1108                         xfs_notice(mp,
1109 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth);
1110                 return false;
1111         }
1112
1113         if (sectorsize && (int)sunit % sectorsize) {
1114                 if (!silent)
1115                         xfs_notice(mp,
1116 "stripe unit (%lld) must be a multiple of the sector size (%d)",
1117                                    sunit, sectorsize);
1118                 return false;
1119         }
1120
1121         if (sunit && !swidth) {
1122                 if (!silent)
1123                         xfs_notice(mp,
1124 "invalid stripe unit (%lld) and stripe width of 0", sunit);
1125                 return false;
1126         }
1127
1128         if (!sunit && swidth) {
1129                 if (!silent)
1130                         xfs_notice(mp,
1131 "invalid stripe width (%lld) and stripe unit of 0", swidth);
1132                 return false;
1133         }
1134
1135         if (sunit && (int)swidth % (int)sunit) {
1136                 if (!silent)
1137                         xfs_notice(mp,
1138 "stripe width (%lld) must be a multiple of the stripe unit (%lld)",
1139                                    swidth, sunit);
1140                 return false;
1141         }
1142         return true;
1143 }