fs/xfs/libxfs/xfs

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This source file includes following definitions.
xfs_perag_get
xfs_perag_get_tag
xfs_perag_put
xfs_validate_sb_read
xfs_validate_sb_write
xfs_validate_sb_common
xfs_sb_quota_from_disk
__xfs_sb_from_disk
xfs_sb_from_disk
xfs_sb_quota_to_disk
xfs_sb_to_disk
xfs_sb_read_verify
xfs_sb_quiet_read_verify
xfs_sb_write_verify
xfs_sb_mount_common
xfs_initialize_perag_data
xfs_log_sb
xfs_sync_sb
xfs_update_secondary_sbs
xfs_sync_sb_buf
xfs_fs_geometry
xfs_sb_read_secondary
xfs_sb_get_secondary
   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_mount.h"
  14 #include "xfs_ialloc.h"
  15 #include "xfs_alloc.h"
  16 #include "xfs_error.h"
  17 #include "xfs_trace.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 
  28 /*
  29  * Physical superblock buffer manipulations. Shared with libxfs in userspace.
  30  */
  31 
  32 /*
  33  * Reference counting access wrappers to the perag structures.
  34  * Because we never free per-ag structures, the only thing we
  35  * have to protect against changes is the tree structure itself.
  36  */
  37 struct xfs_perag *
  38 xfs_perag_get(
  39         struct xfs_mount        *mp,
  40         xfs_agnumber_t          agno)
  41 {
  42         struct xfs_perag        *pag;
  43         int                     ref = 0;
  44 
  45         rcu_read_lock();
  46         pag = radix_tree_lookup(&mp->m_perag_tree, agno);
  47         if (pag) {
  48                 ASSERT(atomic_read(&pag->pag_ref) >= 0);
  49                 ref = atomic_inc_return(&pag->pag_ref);
  50         }
  51         rcu_read_unlock();
  52         trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
  53         return pag;
  54 }
  55 
  56 /*
  57  * search from @first to find the next perag with the given tag set.
  58  */
  59 struct xfs_perag *
  60 xfs_perag_get_tag(
  61         struct xfs_mount        *mp,
  62         xfs_agnumber_t          first,
  63         int                     tag)
  64 {
  65         struct xfs_perag        *pag;
  66         int                     found;
  67         int                     ref;
  68 
  69         rcu_read_lock();
  70         found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
  71                                         (void **)&pag, first, 1, tag);
  72         if (found <= 0) {
  73                 rcu_read_unlock();
  74                 return NULL;
  75         }
  76         ref = atomic_inc_return(&pag->pag_ref);
  77         rcu_read_unlock();
  78         trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
  79         return pag;
  80 }
  81 
  82 void
  83 xfs_perag_put(
  84         struct xfs_perag        *pag)
  85 {
  86         int     ref;
  87 
  88         ASSERT(atomic_read(&pag->pag_ref) > 0);
  89         ref = atomic_dec_return(&pag->pag_ref);
  90         trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
  91 }
  92 
  93 /* Check all the superblock fields we care about when reading one in. */
  94 STATIC int
  95 xfs_validate_sb_read(
  96         struct xfs_mount        *mp,
  97         struct xfs_sb           *sbp)
  98 {
  99         if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
 100                 return 0;
 101 
 102         /*
 103          * Version 5 superblock feature mask validation. Reject combinations
 104          * the kernel cannot support up front before checking anything else.
 105          */
 106         if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
 107                 xfs_warn(mp,
 108 "Superblock has unknown compatible features (0x%x) enabled.",
 109                         (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
 110                 xfs_warn(mp,
 111 "Using a more recent kernel is recommended.");
 112         }
 113 
 114         if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
 115                 xfs_alert(mp,
 116 "Superblock has unknown read-only compatible features (0x%x) enabled.",
 117                         (sbp->sb_features_ro_compat &
 118                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
 119                 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
 120                         xfs_warn(mp,
 121 "Attempted to mount read-only compatible filesystem read-write.");
 122                         xfs_warn(mp,
 123 "Filesystem can only be safely mounted read only.");
 124 
 125                         return -EINVAL;
 126                 }
 127         }
 128         if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
 129                 xfs_warn(mp,
 130 "Superblock has unknown incompatible features (0x%x) enabled.",
 131                         (sbp->sb_features_incompat &
 132                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN));
 133                 xfs_warn(mp,
 134 "Filesystem cannot be safely mounted by this kernel.");
 135                 return -EINVAL;
 136         }
 137 
 138         return 0;
 139 }
 140 
 141 /* Check all the superblock fields we care about when writing one out. */
 142 STATIC int
 143 xfs_validate_sb_write(
 144         struct xfs_mount        *mp,
 145         struct xfs_buf          *bp,
 146         struct xfs_sb           *sbp)
 147 {
 148         /*
 149          * Carry out additional sb summary counter sanity checks when we write
 150          * the superblock.  We skip this in the read validator because there
 151          * could be newer superblocks in the log and if the values are garbage
 152          * even after replay we'll recalculate them at the end of log mount.
 153          *
 154          * mkfs has traditionally written zeroed counters to inprogress and
 155          * secondary superblocks, so allow this usage to continue because
 156          * we never read counters from such superblocks.
 157          */
 158         if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
 159             (sbp->sb_fdblocks > sbp->sb_dblocks ||
 160              !xfs_verify_icount(mp, sbp->sb_icount) ||
 161              sbp->sb_ifree > sbp->sb_icount)) {
 162                 xfs_warn(mp, "SB summary counter sanity check failed");
 163                 return -EFSCORRUPTED;
 164         }
 165 
 166         if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
 167                 return 0;
 168 
 169         /*
 170          * Version 5 superblock feature mask validation. Reject combinations
 171          * the kernel cannot support since we checked for unsupported bits in
 172          * the read verifier, which means that memory is corrupt.
 173          */
 174         if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
 175                 xfs_warn(mp,
 176 "Corruption detected in superblock compatible features (0x%x)!",
 177                         (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
 178                 return -EFSCORRUPTED;
 179         }
 180 
 181         if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
 182                 xfs_alert(mp,
 183 "Corruption detected in superblock read-only compatible features (0x%x)!",
 184                         (sbp->sb_features_ro_compat &
 185                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
 186                 return -EFSCORRUPTED;
 187         }
 188         if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
 189                 xfs_warn(mp,
 190 "Corruption detected in superblock incompatible features (0x%x)!",
 191                         (sbp->sb_features_incompat &
 192                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN));
 193                 return -EFSCORRUPTED;
 194         }
 195         if (xfs_sb_has_incompat_log_feature(sbp,
 196                         XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
 197                 xfs_warn(mp,
 198 "Corruption detected in superblock incompatible log features (0x%x)!",
 199                         (sbp->sb_features_log_incompat &
 200                                         XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
 201                 return -EFSCORRUPTED;
 202         }
 203 
 204         /*
 205          * We can't read verify the sb LSN because the read verifier is called
 206          * before the log is allocated and processed. We know the log is set up
 207          * before write verifier calls, so check it here.
 208          */
 209         if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
 210                 return -EFSCORRUPTED;
 211 
 212         return 0;
 213 }
 214 
 215 /* Check the validity of the SB. */
 216 STATIC int
 217 xfs_validate_sb_common(
 218         struct xfs_mount        *mp,
 219         struct xfs_buf          *bp,
 220         struct xfs_sb           *sbp)
 221 {
 222         struct xfs_dsb          *dsb = XFS_BUF_TO_SBP(bp);
 223         uint32_t                agcount = 0;
 224         uint32_t                rem;
 225 
 226         if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
 227                 xfs_warn(mp, "bad magic number");
 228                 return -EWRONGFS;
 229         }
 230 
 231         if (!xfs_sb_good_version(sbp)) {
 232                 xfs_warn(mp, "bad version");
 233                 return -EWRONGFS;
 234         }
 235 
 236         if (xfs_sb_version_has_pquotino(sbp)) {
 237                 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
 238                         xfs_notice(mp,
 239                            "Version 5 of Super block has XFS_OQUOTA bits.");
 240                         return -EFSCORRUPTED;
 241                 }
 242         } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
 243                                 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
 244                         xfs_notice(mp,
 245 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
 246                         return -EFSCORRUPTED;
 247         }
 248 
 249         /*
 250          * Full inode chunks must be aligned to inode chunk size when
 251          * sparse inodes are enabled to support the sparse chunk
 252          * allocation algorithm and prevent overlapping inode records.
 253          */
 254         if (xfs_sb_version_hassparseinodes(sbp)) {
 255                 uint32_t        align;
 256 
 257                 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
 258                                 >> sbp->sb_blocklog;
 259                 if (sbp->sb_inoalignmt != align) {
 260                         xfs_warn(mp,
 261 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
 262                                  sbp->sb_inoalignmt, align);
 263                         return -EINVAL;
 264                 }
 265         }
 266 
 267         if (unlikely(
 268             sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
 269                 xfs_warn(mp,
 270                 "filesystem is marked as having an external log; "
 271                 "specify logdev on the mount command line.");
 272                 return -EINVAL;
 273         }
 274 
 275         if (unlikely(
 276             sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
 277                 xfs_warn(mp,
 278                 "filesystem is marked as having an internal log; "
 279                 "do not specify logdev on the mount command line.");
 280                 return -EINVAL;
 281         }
 282 
 283         /* Compute agcount for this number of dblocks and agblocks */
 284         if (sbp->sb_agblocks) {
 285                 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
 286                 if (rem)
 287                         agcount++;
 288         }
 289 
 290         /*
 291          * More sanity checking.  Most of these were stolen directly from
 292          * xfs_repair.
 293          */
 294         if (unlikely(
 295             sbp->sb_agcount <= 0                                        ||
 296             sbp->sb_sectsize < XFS_MIN_SECTORSIZE                       ||
 297             sbp->sb_sectsize > XFS_MAX_SECTORSIZE                       ||
 298             sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG                    ||
 299             sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG                    ||
 300             sbp->sb_sectsize != (1 << sbp->sb_sectlog)                  ||
 301             sbp->sb_blocksize < XFS_MIN_BLOCKSIZE                       ||
 302             sbp->sb_blocksize > XFS_MAX_BLOCKSIZE                       ||
 303             sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG                    ||
 304             sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG                    ||
 305             sbp->sb_blocksize != (1 << sbp->sb_blocklog)                ||
 306             sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
 307             sbp->sb_inodesize < XFS_DINODE_MIN_SIZE                     ||
 308             sbp->sb_inodesize > XFS_DINODE_MAX_SIZE                     ||
 309             sbp->sb_inodelog < XFS_DINODE_MIN_LOG                       ||
 310             sbp->sb_inodelog > XFS_DINODE_MAX_LOG                       ||
 311             sbp->sb_inodesize != (1 << sbp->sb_inodelog)                ||
 312             sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE                    ||
 313             sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
 314             XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES       ||
 315             XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES       ||
 316             sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
 317             agcount == 0 || agcount != sbp->sb_agcount                  ||
 318             (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog)   ||
 319             (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE)  ||
 320             (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)  ||
 321             (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */)    ||
 322             sbp->sb_dblocks == 0                                        ||
 323             sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp)                      ||
 324             sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp)                      ||
 325             sbp->sb_shared_vn != 0)) {
 326                 xfs_notice(mp, "SB sanity check failed");
 327                 return -EFSCORRUPTED;
 328         }
 329 
 330         if (sbp->sb_unit) {
 331                 if (!xfs_sb_version_hasdalign(sbp) ||
 332                     sbp->sb_unit > sbp->sb_width ||
 333                     (sbp->sb_width % sbp->sb_unit) != 0) {
 334                         xfs_notice(mp, "SB stripe unit sanity check failed");
 335                         return -EFSCORRUPTED;
 336                 }
 337         } else if (xfs_sb_version_hasdalign(sbp)) {
 338                 xfs_notice(mp, "SB stripe alignment sanity check failed");
 339                 return -EFSCORRUPTED;
 340         } else if (sbp->sb_width) {
 341                 xfs_notice(mp, "SB stripe width sanity check failed");
 342                 return -EFSCORRUPTED;
 343         }
 344 
 345 
 346         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 347             sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
 348                 xfs_notice(mp, "v5 SB sanity check failed");
 349                 return -EFSCORRUPTED;
 350         }
 351 
 352         /*
 353          * Until this is fixed only page-sized or smaller data blocks work.
 354          */
 355         if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
 356                 xfs_warn(mp,
 357                 "File system with blocksize %d bytes. "
 358                 "Only pagesize (%ld) or less will currently work.",
 359                                 sbp->sb_blocksize, PAGE_SIZE);
 360                 return -ENOSYS;
 361         }
 362 
 363         /*
 364          * Currently only very few inode sizes are supported.
 365          */
 366         switch (sbp->sb_inodesize) {
 367         case 256:
 368         case 512:
 369         case 1024:
 370         case 2048:
 371                 break;
 372         default:
 373                 xfs_warn(mp, "inode size of %d bytes not supported",
 374                                 sbp->sb_inodesize);
 375                 return -ENOSYS;
 376         }
 377 
 378         if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
 379             xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
 380                 xfs_warn(mp,
 381                 "file system too large to be mounted on this system.");
 382                 return -EFBIG;
 383         }
 384 
 385         /*
 386          * Don't touch the filesystem if a user tool thinks it owns the primary
 387          * superblock.  mkfs doesn't clear the flag from secondary supers, so
 388          * we don't check them at all.
 389          */
 390         if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && sbp->sb_inprogress) {
 391                 xfs_warn(mp, "Offline file system operation in progress!");
 392                 return -EFSCORRUPTED;
 393         }
 394         return 0;
 395 }
 396 
 397 void
 398 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
 399 {
 400         /*
 401          * older mkfs doesn't initialize quota inodes to NULLFSINO. This
 402          * leads to in-core values having two different values for a quota
 403          * inode to be invalid: 0 and NULLFSINO. Change it to a single value
 404          * NULLFSINO.
 405          *
 406          * Note that this change affect only the in-core values. These
 407          * values are not written back to disk unless any quota information
 408          * is written to the disk. Even in that case, sb_pquotino field is
 409          * not written to disk unless the superblock supports pquotino.
 410          */
 411         if (sbp->sb_uquotino == 0)
 412                 sbp->sb_uquotino = NULLFSINO;
 413         if (sbp->sb_gquotino == 0)
 414                 sbp->sb_gquotino = NULLFSINO;
 415         if (sbp->sb_pquotino == 0)
 416                 sbp->sb_pquotino = NULLFSINO;
 417 
 418         /*
 419          * We need to do these manipilations only if we are working
 420          * with an older version of on-disk superblock.
 421          */
 422         if (xfs_sb_version_has_pquotino(sbp))
 423                 return;
 424 
 425         if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
 426                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
 427                                         XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
 428         if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
 429                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
 430                                         XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
 431         sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
 432 
 433         if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
 434             sbp->sb_gquotino != NULLFSINO)  {
 435                 /*
 436                  * In older version of superblock, on-disk superblock only
 437                  * has sb_gquotino, and in-core superblock has both sb_gquotino
 438                  * and sb_pquotino. But, only one of them is supported at any
 439                  * point of time. So, if PQUOTA is set in disk superblock,
 440                  * copy over sb_gquotino to sb_pquotino.  The NULLFSINO test
 441                  * above is to make sure we don't do this twice and wipe them
 442                  * both out!
 443                  */
 444                 sbp->sb_pquotino = sbp->sb_gquotino;
 445                 sbp->sb_gquotino = NULLFSINO;
 446         }
 447 }
 448 
 449 static void
 450 __xfs_sb_from_disk(
 451         struct xfs_sb   *to,
 452         xfs_dsb_t       *from,
 453         bool            convert_xquota)
 454 {
 455         to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
 456         to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
 457         to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
 458         to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
 459         to->sb_rextents = be64_to_cpu(from->sb_rextents);
 460         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
 461         to->sb_logstart = be64_to_cpu(from->sb_logstart);
 462         to->sb_rootino = be64_to_cpu(from->sb_rootino);
 463         to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
 464         to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
 465         to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
 466         to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
 467         to->sb_agcount = be32_to_cpu(from->sb_agcount);
 468         to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
 469         to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
 470         to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
 471         to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
 472         to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
 473         to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
 474         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
 475         to->sb_blocklog = from->sb_blocklog;
 476         to->sb_sectlog = from->sb_sectlog;
 477         to->sb_inodelog = from->sb_inodelog;
 478         to->sb_inopblog = from->sb_inopblog;
 479         to->sb_agblklog = from->sb_agblklog;
 480         to->sb_rextslog = from->sb_rextslog;
 481         to->sb_inprogress = from->sb_inprogress;
 482         to->sb_imax_pct = from->sb_imax_pct;
 483         to->sb_icount = be64_to_cpu(from->sb_icount);
 484         to->sb_ifree = be64_to_cpu(from->sb_ifree);
 485         to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
 486         to->sb_frextents = be64_to_cpu(from->sb_frextents);
 487         to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
 488         to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
 489         to->sb_qflags = be16_to_cpu(from->sb_qflags);
 490         to->sb_flags = from->sb_flags;
 491         to->sb_shared_vn = from->sb_shared_vn;
 492         to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
 493         to->sb_unit = be32_to_cpu(from->sb_unit);
 494         to->sb_width = be32_to_cpu(from->sb_width);
 495         to->sb_dirblklog = from->sb_dirblklog;
 496         to->sb_logsectlog = from->sb_logsectlog;
 497         to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
 498         to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
 499         to->sb_features2 = be32_to_cpu(from->sb_features2);
 500         to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
 501         to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
 502         to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
 503         to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
 504         to->sb_features_log_incompat =
 505                                 be32_to_cpu(from->sb_features_log_incompat);
 506         /* crc is only used on disk, not in memory; just init to 0 here. */
 507         to->sb_crc = 0;
 508         to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
 509         to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
 510         to->sb_lsn = be64_to_cpu(from->sb_lsn);
 511         /*
 512          * sb_meta_uuid is only on disk if it differs from sb_uuid and the
 513          * feature flag is set; if not set we keep it only in memory.
 514          */
 515         if (xfs_sb_version_hasmetauuid(to))
 516                 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
 517         else
 518                 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
 519         /* Convert on-disk flags to in-memory flags? */
 520         if (convert_xquota)
 521                 xfs_sb_quota_from_disk(to);
 522 }
 523 
 524 void
 525 xfs_sb_from_disk(
 526         struct xfs_sb   *to,
 527         xfs_dsb_t       *from)
 528 {
 529         __xfs_sb_from_disk(to, from, true);
 530 }
 531 
 532 static void
 533 xfs_sb_quota_to_disk(
 534         struct xfs_dsb  *to,
 535         struct xfs_sb   *from)
 536 {
 537         uint16_t        qflags = from->sb_qflags;
 538 
 539         to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
 540         if (xfs_sb_version_has_pquotino(from)) {
 541                 to->sb_qflags = cpu_to_be16(from->sb_qflags);
 542                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
 543                 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
 544                 return;
 545         }
 546 
 547         /*
 548          * The in-core version of sb_qflags do not have XFS_OQUOTA_*
 549          * flags, whereas the on-disk version does.  So, convert incore
 550          * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
 551          */
 552         qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
 553                         XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
 554 
 555         if (from->sb_qflags &
 556                         (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
 557                 qflags |= XFS_OQUOTA_ENFD;
 558         if (from->sb_qflags &
 559                         (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
 560                 qflags |= XFS_OQUOTA_CHKD;
 561         to->sb_qflags = cpu_to_be16(qflags);
 562 
 563         /*
 564          * GQUOTINO and PQUOTINO cannot be used together in versions
 565          * of superblock that do not have pquotino. from->sb_flags
 566          * tells us which quota is active and should be copied to
 567          * disk. If neither are active, we should NULL the inode.
 568          *
 569          * In all cases, the separate pquotino must remain 0 because it
 570          * it beyond the "end" of the valid non-pquotino superblock.
 571          */
 572         if (from->sb_qflags & XFS_GQUOTA_ACCT)
 573                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
 574         else if (from->sb_qflags & XFS_PQUOTA_ACCT)
 575                 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
 576         else {
 577                 /*
 578                  * We can't rely on just the fields being logged to tell us
 579                  * that it is safe to write NULLFSINO - we should only do that
 580                  * if quotas are not actually enabled. Hence only write
 581                  * NULLFSINO if both in-core quota inodes are NULL.
 582                  */
 583                 if (from->sb_gquotino == NULLFSINO &&
 584                     from->sb_pquotino == NULLFSINO)
 585                         to->sb_gquotino = cpu_to_be64(NULLFSINO);
 586         }
 587 
 588         to->sb_pquotino = 0;
 589 }
 590 
 591 void
 592 xfs_sb_to_disk(
 593         struct xfs_dsb  *to,
 594         struct xfs_sb   *from)
 595 {
 596         xfs_sb_quota_to_disk(to, from);
 597 
 598         to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
 599         to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
 600         to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
 601         to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
 602         to->sb_rextents = cpu_to_be64(from->sb_rextents);
 603         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
 604         to->sb_logstart = cpu_to_be64(from->sb_logstart);
 605         to->sb_rootino = cpu_to_be64(from->sb_rootino);
 606         to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
 607         to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
 608         to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
 609         to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
 610         to->sb_agcount = cpu_to_be32(from->sb_agcount);
 611         to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
 612         to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
 613         to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
 614         to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
 615         to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
 616         to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
 617         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
 618         to->sb_blocklog = from->sb_blocklog;
 619         to->sb_sectlog = from->sb_sectlog;
 620         to->sb_inodelog = from->sb_inodelog;
 621         to->sb_inopblog = from->sb_inopblog;
 622         to->sb_agblklog = from->sb_agblklog;
 623         to->sb_rextslog = from->sb_rextslog;
 624         to->sb_inprogress = from->sb_inprogress;
 625         to->sb_imax_pct = from->sb_imax_pct;
 626         to->sb_icount = cpu_to_be64(from->sb_icount);
 627         to->sb_ifree = cpu_to_be64(from->sb_ifree);
 628         to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
 629         to->sb_frextents = cpu_to_be64(from->sb_frextents);
 630 
 631         to->sb_flags = from->sb_flags;
 632         to->sb_shared_vn = from->sb_shared_vn;
 633         to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
 634         to->sb_unit = cpu_to_be32(from->sb_unit);
 635         to->sb_width = cpu_to_be32(from->sb_width);
 636         to->sb_dirblklog = from->sb_dirblklog;
 637         to->sb_logsectlog = from->sb_logsectlog;
 638         to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
 639         to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
 640 
 641         /*
 642          * We need to ensure that bad_features2 always matches features2.
 643          * Hence we enforce that here rather than having to remember to do it
 644          * everywhere else that updates features2.
 645          */
 646         from->sb_bad_features2 = from->sb_features2;
 647         to->sb_features2 = cpu_to_be32(from->sb_features2);
 648         to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
 649 
 650         if (xfs_sb_version_hascrc(from)) {
 651                 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
 652                 to->sb_features_ro_compat =
 653                                 cpu_to_be32(from->sb_features_ro_compat);
 654                 to->sb_features_incompat =
 655                                 cpu_to_be32(from->sb_features_incompat);
 656                 to->sb_features_log_incompat =
 657                                 cpu_to_be32(from->sb_features_log_incompat);
 658                 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
 659                 to->sb_lsn = cpu_to_be64(from->sb_lsn);
 660                 if (xfs_sb_version_hasmetauuid(from))
 661                         uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
 662         }
 663 }
 664 
 665 /*
 666  * If the superblock has the CRC feature bit set or the CRC field is non-null,
 667  * check that the CRC is valid.  We check the CRC field is non-null because a
 668  * single bit error could clear the feature bit and unused parts of the
 669  * superblock are supposed to be zero. Hence a non-null crc field indicates that
 670  * we've potentially lost a feature bit and we should check it anyway.
 671  *
 672  * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
 673  * last field in V4 secondary superblocks.  So for secondary superblocks,
 674  * we are more forgiving, and ignore CRC failures if the primary doesn't
 675  * indicate that the fs version is V5.
 676  */
 677 static void
 678 xfs_sb_read_verify(
 679         struct xfs_buf          *bp)
 680 {
 681         struct xfs_sb           sb;
 682         struct xfs_mount        *mp = bp->b_mount;
 683         struct xfs_dsb          *dsb = XFS_BUF_TO_SBP(bp);
 684         int                     error;
 685 
 686         /*
 687          * open code the version check to avoid needing to convert the entire
 688          * superblock from disk order just to check the version number
 689          */
 690         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
 691             (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
 692                                                 XFS_SB_VERSION_5) ||
 693              dsb->sb_crc != 0)) {
 694 
 695                 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
 696                         /* Only fail bad secondaries on a known V5 filesystem */
 697                         if (bp->b_bn == XFS_SB_DADDR ||
 698                             xfs_sb_version_hascrc(&mp->m_sb)) {
 699                                 error = -EFSBADCRC;
 700                                 goto out_error;
 701                         }
 702                 }
 703         }
 704 
 705         /*
 706          * Check all the superblock fields.  Don't byteswap the xquota flags
 707          * because _verify_common checks the on-disk values.
 708          */
 709         __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false);
 710         error = xfs_validate_sb_common(mp, bp, &sb);
 711         if (error)
 712                 goto out_error;
 713         error = xfs_validate_sb_read(mp, &sb);
 714 
 715 out_error:
 716         if (error == -EFSCORRUPTED || error == -EFSBADCRC)
 717                 xfs_verifier_error(bp, error, __this_address);
 718         else if (error)
 719                 xfs_buf_ioerror(bp, error);
 720 }
 721 
 722 /*
 723  * We may be probed for a filesystem match, so we may not want to emit
 724  * messages when the superblock buffer is not actually an XFS superblock.
 725  * If we find an XFS superblock, then run a normal, noisy mount because we are
 726  * really going to mount it and want to know about errors.
 727  */
 728 static void
 729 xfs_sb_quiet_read_verify(
 730         struct xfs_buf  *bp)
 731 {
 732         struct xfs_dsb  *dsb = XFS_BUF_TO_SBP(bp);
 733 
 734         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
 735                 /* XFS filesystem, verify noisily! */
 736                 xfs_sb_read_verify(bp);
 737                 return;
 738         }
 739         /* quietly fail */
 740         xfs_buf_ioerror(bp, -EWRONGFS);
 741 }
 742 
 743 static void
 744 xfs_sb_write_verify(
 745         struct xfs_buf          *bp)
 746 {
 747         struct xfs_sb           sb;
 748         struct xfs_mount        *mp = bp->b_mount;
 749         struct xfs_buf_log_item *bip = bp->b_log_item;
 750         int                     error;
 751 
 752         /*
 753          * Check all the superblock fields.  Don't byteswap the xquota flags
 754          * because _verify_common checks the on-disk values.
 755          */
 756         __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false);
 757         error = xfs_validate_sb_common(mp, bp, &sb);
 758         if (error)
 759                 goto out_error;
 760         error = xfs_validate_sb_write(mp, bp, &sb);
 761         if (error)
 762                 goto out_error;
 763 
 764         if (!xfs_sb_version_hascrc(&mp->m_sb))
 765                 return;
 766 
 767         if (bip)
 768                 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
 769 
 770         xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
 771         return;
 772 
 773 out_error:
 774         xfs_verifier_error(bp, error, __this_address);
 775 }
 776 
 777 const struct xfs_buf_ops xfs_sb_buf_ops = {
 778         .name = "xfs_sb",
 779         .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
 780         .verify_read = xfs_sb_read_verify,
 781         .verify_write = xfs_sb_write_verify,
 782 };
 783 
 784 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
 785         .name = "xfs_sb_quiet",
 786         .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
 787         .verify_read = xfs_sb_quiet_read_verify,
 788         .verify_write = xfs_sb_write_verify,
 789 };
 790 
 791 /*
 792  * xfs_mount_common
 793  *
 794  * Mount initialization code establishing various mount
 795  * fields from the superblock associated with the given
 796  * mount structure.
 797  *
 798  * Inode geometry are calculated in xfs_ialloc_setup_geometry.
 799  */
 800 void
 801 xfs_sb_mount_common(
 802         struct xfs_mount        *mp,
 803         struct xfs_sb           *sbp)
 804 {
 805         mp->m_agfrotor = mp->m_agirotor = 0;
 806         mp->m_maxagi = mp->m_sb.sb_agcount;
 807         mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
 808         mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
 809         mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
 810         mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
 811         mp->m_blockmask = sbp->sb_blocksize - 1;
 812         mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
 813         mp->m_blockwmask = mp->m_blockwsize - 1;
 814 
 815         mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
 816         mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
 817         mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
 818         mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
 819 
 820         mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
 821         mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
 822         mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
 823         mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
 824 
 825         mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1);
 826         mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0);
 827         mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
 828         mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
 829 
 830         mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true);
 831         mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false);
 832         mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
 833         mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
 834 
 835         mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
 836         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
 837         mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
 838 }
 839 
 840 /*
 841  * xfs_initialize_perag_data
 842  *
 843  * Read in each per-ag structure so we can count up the number of
 844  * allocated inodes, free inodes and used filesystem blocks as this
 845  * information is no longer persistent in the superblock. Once we have
 846  * this information, write it into the in-core superblock structure.
 847  */
 848 int
 849 xfs_initialize_perag_data(
 850         struct xfs_mount *mp,
 851         xfs_agnumber_t  agcount)
 852 {
 853         xfs_agnumber_t  index;
 854         xfs_perag_t     *pag;
 855         xfs_sb_t        *sbp = &mp->m_sb;
 856         uint64_t        ifree = 0;
 857         uint64_t        ialloc = 0;
 858         uint64_t        bfree = 0;
 859         uint64_t        bfreelst = 0;
 860         uint64_t        btree = 0;
 861         uint64_t        fdblocks;
 862         int             error = 0;
 863 
 864         for (index = 0; index < agcount; index++) {
 865                 /*
 866                  * read the agf, then the agi. This gets us
 867                  * all the information we need and populates the
 868                  * per-ag structures for us.
 869                  */
 870                 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
 871                 if (error)
 872                         return error;
 873 
 874                 error = xfs_ialloc_pagi_init(mp, NULL, index);
 875                 if (error)
 876                         return error;
 877                 pag = xfs_perag_get(mp, index);
 878                 ifree += pag->pagi_freecount;
 879                 ialloc += pag->pagi_count;
 880                 bfree += pag->pagf_freeblks;
 881                 bfreelst += pag->pagf_flcount;
 882                 btree += pag->pagf_btreeblks;
 883                 xfs_perag_put(pag);
 884         }
 885         fdblocks = bfree + bfreelst + btree;
 886 
 887         /*
 888          * If the new summary counts are obviously incorrect, fail the
 889          * mount operation because that implies the AGFs are also corrupt.
 890          * Clear FS_COUNTERS so that we don't unmount with a dirty log, which
 891          * will prevent xfs_repair from fixing anything.
 892          */
 893         if (fdblocks > sbp->sb_dblocks || ifree > ialloc) {
 894                 xfs_alert(mp, "AGF corruption. Please run xfs_repair.");
 895                 error = -EFSCORRUPTED;
 896                 goto out;
 897         }
 898 
 899         /* Overwrite incore superblock counters with just-read data */
 900         spin_lock(&mp->m_sb_lock);
 901         sbp->sb_ifree = ifree;
 902         sbp->sb_icount = ialloc;
 903         sbp->sb_fdblocks = fdblocks;
 904         spin_unlock(&mp->m_sb_lock);
 905 
 906         xfs_reinit_percpu_counters(mp);
 907 out:
 908         xfs_fs_mark_healthy(mp, XFS_SICK_FS_COUNTERS);
 909         return error;
 910 }
 911 
 912 /*
 913  * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
 914  * into the superblock buffer to be logged.  It does not provide the higher
 915  * level of locking that is needed to protect the in-core superblock from
 916  * concurrent access.
 917  */
 918 void
 919 xfs_log_sb(
 920         struct xfs_trans        *tp)
 921 {
 922         struct xfs_mount        *mp = tp->t_mountp;
 923         struct xfs_buf          *bp = xfs_trans_getsb(tp, mp);
 924 
 925         mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
 926         mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree);
 927         mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 928 
 929         xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 930         xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
 931         xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
 932 }
 933 
 934 /*
 935  * xfs_sync_sb
 936  *
 937  * Sync the superblock to disk.
 938  *
 939  * Note that the caller is responsible for checking the frozen state of the
 940  * filesystem. This procedure uses the non-blocking transaction allocator and
 941  * thus will allow modifications to a frozen fs. This is required because this
 942  * code can be called during the process of freezing where use of the high-level
 943  * allocator would deadlock.
 944  */
 945 int
 946 xfs_sync_sb(
 947         struct xfs_mount        *mp,
 948         bool                    wait)
 949 {
 950         struct xfs_trans        *tp;
 951         int                     error;
 952 
 953         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
 954                         XFS_TRANS_NO_WRITECOUNT, &tp);
 955         if (error)
 956                 return error;
 957 
 958         xfs_log_sb(tp);
 959         if (wait)
 960                 xfs_trans_set_sync(tp);
 961         return xfs_trans_commit(tp);
 962 }
 963 
 964 /*
 965  * Update all the secondary superblocks to match the new state of the primary.
 966  * Because we are completely overwriting all the existing fields in the
 967  * secondary superblock buffers, there is no need to read them in from disk.
 968  * Just get a new buffer, stamp it and write it.
 969  *
 970  * The sb buffers need to be cached here so that we serialise against other
 971  * operations that access the secondary superblocks, but we don't want to keep
 972  * them in memory once it is written so we mark it as a one-shot buffer.
 973  */
 974 int
 975 xfs_update_secondary_sbs(
 976         struct xfs_mount        *mp)
 977 {
 978         xfs_agnumber_t          agno;
 979         int                     saved_error = 0;
 980         int                     error = 0;
 981         LIST_HEAD               (buffer_list);
 982 
 983         /* update secondary superblocks. */
 984         for (agno = 1; agno < mp->m_sb.sb_agcount; agno++) {
 985                 struct xfs_buf          *bp;
 986 
 987                 bp = xfs_buf_get(mp->m_ddev_targp,
 988                                  XFS_AG_DADDR(mp, agno, XFS_SB_DADDR),
 989                                  XFS_FSS_TO_BB(mp, 1));
 990                 /*
 991                  * If we get an error reading or writing alternate superblocks,
 992                  * continue.  xfs_repair chooses the "best" superblock based
 993                  * on most matches; if we break early, we'll leave more
 994                  * superblocks un-updated than updated, and xfs_repair may
 995                  * pick them over the properly-updated primary.
 996                  */
 997                 if (!bp) {
 998                         xfs_warn(mp,
 999                 "error allocating secondary superblock for ag %d",
1000                                 agno);
1001                         if (!saved_error)
1002                                 saved_error = -ENOMEM;
1003                         continue;
1004                 }
1005 
1006                 bp->b_ops = &xfs_sb_buf_ops;
1007                 xfs_buf_oneshot(bp);
1008                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
1009                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
1010                 xfs_buf_delwri_queue(bp, &buffer_list);
1011                 xfs_buf_relse(bp);
1012 
1013                 /* don't hold too many buffers at once */
1014                 if (agno % 16)
1015                         continue;
1016 
1017                 error = xfs_buf_delwri_submit(&buffer_list);
1018                 if (error) {
1019                         xfs_warn(mp,
1020                 "write error %d updating a secondary superblock near ag %d",
1021                                 error, agno);
1022                         if (!saved_error)
1023                                 saved_error = error;
1024                         continue;
1025                 }
1026         }
1027         error = xfs_buf_delwri_submit(&buffer_list);
1028         if (error) {
1029                 xfs_warn(mp,
1030                 "write error %d updating a secondary superblock near ag %d",
1031                         error, agno);
1032         }
1033 
1034         return saved_error ? saved_error : error;
1035 }
1036 
1037 /*
1038  * Same behavior as xfs_sync_sb, except that it is always synchronous and it
1039  * also writes the superblock buffer to disk sector 0 immediately.
1040  */
1041 int
1042 xfs_sync_sb_buf(
1043         struct xfs_mount        *mp)
1044 {
1045         struct xfs_trans        *tp;
1046         struct xfs_buf          *bp;
1047         int                     error;
1048 
1049         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
1050         if (error)
1051                 return error;
1052 
1053         bp = xfs_trans_getsb(tp, mp);
1054         xfs_log_sb(tp);
1055         xfs_trans_bhold(tp, bp);
1056         xfs_trans_set_sync(tp);
1057         error = xfs_trans_commit(tp);
1058         if (error)
1059                 goto out;
1060         /*
1061          * write out the sb buffer to get the changes to disk
1062          */
1063         error = xfs_bwrite(bp);
1064 out:
1065         xfs_buf_relse(bp);
1066         return error;
1067 }
1068 
1069 void
1070 xfs_fs_geometry(
1071         struct xfs_sb           *sbp,
1072         struct xfs_fsop_geom    *geo,
1073         int                     struct_version)
1074 {
1075         memset(geo, 0, sizeof(struct xfs_fsop_geom));
1076 
1077         geo->blocksize = sbp->sb_blocksize;
1078         geo->rtextsize = sbp->sb_rextsize;
1079         geo->agblocks = sbp->sb_agblocks;
1080         geo->agcount = sbp->sb_agcount;
1081         geo->logblocks = sbp->sb_logblocks;
1082         geo->sectsize = sbp->sb_sectsize;
1083         geo->inodesize = sbp->sb_inodesize;
1084         geo->imaxpct = sbp->sb_imax_pct;
1085         geo->datablocks = sbp->sb_dblocks;
1086         geo->rtblocks = sbp->sb_rblocks;
1087         geo->rtextents = sbp->sb_rextents;
1088         geo->logstart = sbp->sb_logstart;
1089         BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
1090         memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
1091 
1092         if (struct_version < 2)
1093                 return;
1094 
1095         geo->sunit = sbp->sb_unit;
1096         geo->swidth = sbp->sb_width;
1097 
1098         if (struct_version < 3)
1099                 return;
1100 
1101         geo->version = XFS_FSOP_GEOM_VERSION;
1102         geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
1103                      XFS_FSOP_GEOM_FLAGS_DIRV2 |
1104                      XFS_FSOP_GEOM_FLAGS_EXTFLG;
1105         if (xfs_sb_version_hasattr(sbp))
1106                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
1107         if (xfs_sb_version_hasquota(sbp))
1108                 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
1109         if (xfs_sb_version_hasalign(sbp))
1110                 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
1111         if (xfs_sb_version_hasdalign(sbp))
1112                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
1113         if (xfs_sb_version_hassector(sbp))
1114                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
1115         if (xfs_sb_version_hasasciici(sbp))
1116                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
1117         if (xfs_sb_version_haslazysbcount(sbp))
1118                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
1119         if (xfs_sb_version_hasattr2(sbp))
1120                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
1121         if (xfs_sb_version_hasprojid32bit(sbp))
1122                 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
1123         if (xfs_sb_version_hascrc(sbp))
1124                 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
1125         if (xfs_sb_version_hasftype(sbp))
1126                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
1127         if (xfs_sb_version_hasfinobt(sbp))
1128                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
1129         if (xfs_sb_version_hassparseinodes(sbp))
1130                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
1131         if (xfs_sb_version_hasrmapbt(sbp))
1132                 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
1133         if (xfs_sb_version_hasreflink(sbp))
1134                 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
1135         if (xfs_sb_version_hassector(sbp))
1136                 geo->logsectsize = sbp->sb_logsectsize;
1137         else
1138                 geo->logsectsize = BBSIZE;
1139         geo->rtsectsize = sbp->sb_blocksize;
1140         geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
1141 
1142         if (struct_version < 4)
1143                 return;
1144 
1145         if (xfs_sb_version_haslogv2(sbp))
1146                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
1147 
1148         geo->logsunit = sbp->sb_logsunit;
1149 
1150         if (struct_version < 5)
1151                 return;
1152 
1153         geo->version = XFS_FSOP_GEOM_VERSION_V5;
1154 }
1155 
1156 /* Read a secondary superblock. */
1157 int
1158 xfs_sb_read_secondary(
1159         struct xfs_mount        *mp,
1160         struct xfs_trans        *tp,
1161         xfs_agnumber_t          agno,
1162         struct xfs_buf          **bpp)
1163 {
1164         struct xfs_buf          *bp;
1165         int                     error;
1166 
1167         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1168         error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1169                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1170                         XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
1171         if (error)
1172                 return error;
1173         xfs_buf_set_ref(bp, XFS_SSB_REF);
1174         *bpp = bp;
1175         return 0;
1176 }
1177 
1178 /* Get an uninitialised secondary superblock buffer. */
1179 int
1180 xfs_sb_get_secondary(
1181         struct xfs_mount        *mp,
1182         struct xfs_trans        *tp,
1183         xfs_agnumber_t          agno,
1184         struct xfs_buf          **bpp)
1185 {
1186         struct xfs_buf          *bp;
1187 
1188         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1189         bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1190                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1191                         XFS_FSS_TO_BB(mp, 1), 0);
1192         if (!bp)
1193                 return -ENOMEM;
1194         bp->b_ops = &xfs_sb_buf_ops;
1195         xfs_buf_oneshot(bp);
1196         *bpp = bp;
1197         return 0;
1198 }
/* [<][>][^][v][top][bottom][index][help] */
root/fs/xfs/libxfs/xfs_sb.c

DEFINITIONS
