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Diffstat (limited to 'fs/xfs/libxfs/xfs_sb.c')
-rw-r--r--fs/xfs/libxfs/xfs_sb.c320
1 files changed, 136 insertions, 184 deletions
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 752915fa775..b0a5fe95a3e 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -40,69 +40,6 @@
* Physical superblock buffer manipulations. Shared with libxfs in userspace.
*/
-static const struct {
- short offset;
- short type; /* 0 = integer
- * 1 = binary / string (no translation)
- */
-} xfs_sb_info[] = {
- { offsetof(xfs_sb_t, sb_magicnum), 0 },
- { offsetof(xfs_sb_t, sb_blocksize), 0 },
- { offsetof(xfs_sb_t, sb_dblocks), 0 },
- { offsetof(xfs_sb_t, sb_rblocks), 0 },
- { offsetof(xfs_sb_t, sb_rextents), 0 },
- { offsetof(xfs_sb_t, sb_uuid), 1 },
- { offsetof(xfs_sb_t, sb_logstart), 0 },
- { offsetof(xfs_sb_t, sb_rootino), 0 },
- { offsetof(xfs_sb_t, sb_rbmino), 0 },
- { offsetof(xfs_sb_t, sb_rsumino), 0 },
- { offsetof(xfs_sb_t, sb_rextsize), 0 },
- { offsetof(xfs_sb_t, sb_agblocks), 0 },
- { offsetof(xfs_sb_t, sb_agcount), 0 },
- { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
- { offsetof(xfs_sb_t, sb_logblocks), 0 },
- { offsetof(xfs_sb_t, sb_versionnum), 0 },
- { offsetof(xfs_sb_t, sb_sectsize), 0 },
- { offsetof(xfs_sb_t, sb_inodesize), 0 },
- { offsetof(xfs_sb_t, sb_inopblock), 0 },
- { offsetof(xfs_sb_t, sb_fname[0]), 1 },
- { offsetof(xfs_sb_t, sb_blocklog), 0 },
- { offsetof(xfs_sb_t, sb_sectlog), 0 },
- { offsetof(xfs_sb_t, sb_inodelog), 0 },
- { offsetof(xfs_sb_t, sb_inopblog), 0 },
- { offsetof(xfs_sb_t, sb_agblklog), 0 },
- { offsetof(xfs_sb_t, sb_rextslog), 0 },
- { offsetof(xfs_sb_t, sb_inprogress), 0 },
- { offsetof(xfs_sb_t, sb_imax_pct), 0 },
- { offsetof(xfs_sb_t, sb_icount), 0 },
- { offsetof(xfs_sb_t, sb_ifree), 0 },
- { offsetof(xfs_sb_t, sb_fdblocks), 0 },
- { offsetof(xfs_sb_t, sb_frextents), 0 },
- { offsetof(xfs_sb_t, sb_uquotino), 0 },
- { offsetof(xfs_sb_t, sb_gquotino), 0 },
- { offsetof(xfs_sb_t, sb_qflags), 0 },
- { offsetof(xfs_sb_t, sb_flags), 0 },
- { offsetof(xfs_sb_t, sb_shared_vn), 0 },
- { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
- { offsetof(xfs_sb_t, sb_unit), 0 },
- { offsetof(xfs_sb_t, sb_width), 0 },
- { offsetof(xfs_sb_t, sb_dirblklog), 0 },
- { offsetof(xfs_sb_t, sb_logsectlog), 0 },
- { offsetof(xfs_sb_t, sb_logsectsize), 0 },
- { offsetof(xfs_sb_t, sb_logsunit), 0 },
- { offsetof(xfs_sb_t, sb_features2), 0 },
- { offsetof(xfs_sb_t, sb_bad_features2), 0 },
- { offsetof(xfs_sb_t, sb_features_compat), 0 },
- { offsetof(xfs_sb_t, sb_features_ro_compat), 0 },
- { offsetof(xfs_sb_t, sb_features_incompat), 0 },
- { offsetof(xfs_sb_t, sb_features_log_incompat), 0 },
- { offsetof(xfs_sb_t, sb_crc), 0 },
- { offsetof(xfs_sb_t, sb_pad), 0 },
- { offsetof(xfs_sb_t, sb_pquotino), 0 },
- { offsetof(xfs_sb_t, sb_lsn), 0 },
- { sizeof(xfs_sb_t), 0 }
-};
-
/*
* Reference counting access wrappers to the perag structures.
* Because we never free per-ag structures, the only thing we
@@ -461,58 +398,49 @@ xfs_sb_from_disk(
__xfs_sb_from_disk(to, from, true);
}
-static inline void
+static void
xfs_sb_quota_to_disk(
- xfs_dsb_t *to,
- xfs_sb_t *from,
- __int64_t *fields)
+ struct xfs_dsb *to,
+ struct xfs_sb *from)
{
__uint16_t qflags = from->sb_qflags;
+ to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
+ if (xfs_sb_version_has_pquotino(from)) {
+ to->sb_qflags = cpu_to_be16(from->sb_qflags);
+ to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
+ to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
+ return;
+ }
+
/*
- * We need to do these manipilations only if we are working
- * with an older version of on-disk superblock.
+ * The in-core version of sb_qflags do not have XFS_OQUOTA_*
+ * flags, whereas the on-disk version does. So, convert incore
+ * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
*/
- if (xfs_sb_version_has_pquotino(from))
- return;
+ qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
+ XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
- if (*fields & XFS_SB_QFLAGS) {
- /*
- * The in-core version of sb_qflags do not have
- * XFS_OQUOTA_* flags, whereas the on-disk version
- * does. So, convert incore XFS_{PG}QUOTA_* flags
- * to on-disk XFS_OQUOTA_* flags.
- */
- qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
- XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
-
- if (from->sb_qflags &
- (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
- qflags |= XFS_OQUOTA_ENFD;
- if (from->sb_qflags &
- (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
- qflags |= XFS_OQUOTA_CHKD;
- to->sb_qflags = cpu_to_be16(qflags);
- *fields &= ~XFS_SB_QFLAGS;
- }
+ if (from->sb_qflags &
+ (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
+ qflags |= XFS_OQUOTA_ENFD;
+ if (from->sb_qflags &
+ (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
+ qflags |= XFS_OQUOTA_CHKD;
+ to->sb_qflags = cpu_to_be16(qflags);
/*
- * GQUOTINO and PQUOTINO cannot be used together in versions of
- * superblock that do not have pquotino. from->sb_flags tells us which
- * quota is active and should be copied to disk. If neither are active,
- * make sure we write NULLFSINO to the sb_gquotino field as a quota
- * inode value of "0" is invalid when the XFS_SB_VERSION_QUOTA feature
- * bit is set.
+ * GQUOTINO and PQUOTINO cannot be used together in versions
+ * of superblock that do not have pquotino. from->sb_flags
+ * tells us which quota is active and should be copied to
+ * disk. If neither are active, we should NULL the inode.
*
- * Note that we don't need to handle the sb_uquotino or sb_pquotino here
- * as they do not require any translation. Hence the main sb field loop
- * will write them appropriately from the in-core superblock.
+ * In all cases, the separate pquotino must remain 0 because it
+ * it beyond the "end" of the valid non-pquotino superblock.
*/
- if ((*fields & XFS_SB_GQUOTINO) &&
- (from->sb_qflags & XFS_GQUOTA_ACCT))
+ if (from->sb_qflags & XFS_GQUOTA_ACCT)
to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
- else if ((*fields & XFS_SB_PQUOTINO) &&
- (from->sb_qflags & XFS_PQUOTA_ACCT))
+ else if (from->sb_qflags & XFS_PQUOTA_ACCT)
to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
else {
/*
@@ -526,63 +454,78 @@ xfs_sb_quota_to_disk(
to->sb_gquotino = cpu_to_be64(NULLFSINO);
}
- *fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO);
+ to->sb_pquotino = 0;
}
-/*
- * Copy in core superblock to ondisk one.
- *
- * The fields argument is mask of superblock fields to copy.
- */
void
xfs_sb_to_disk(
- xfs_dsb_t *to,
- xfs_sb_t *from,
- __int64_t fields)
+ struct xfs_dsb *to,
+ struct xfs_sb *from)
{
- xfs_caddr_t to_ptr = (xfs_caddr_t)to;
- xfs_caddr_t from_ptr = (xfs_caddr_t)from;
- xfs_sb_field_t f;
- int first;
- int size;
-
- ASSERT(fields);
- if (!fields)
- return;
+ xfs_sb_quota_to_disk(to, from);
- /* We should never write the crc here, it's updated in the IO path */
- fields &= ~XFS_SB_CRC;
-
- xfs_sb_quota_to_disk(to, from, &fields);
- while (fields) {
- f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
- first = xfs_sb_info[f].offset;
- size = xfs_sb_info[f + 1].offset - first;
-
- ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
-
- if (size == 1 || xfs_sb_info[f].type == 1) {
- memcpy(to_ptr + first, from_ptr + first, size);
- } else {
- switch (size) {
- case 2:
- *(__be16 *)(to_ptr + first) =
- cpu_to_be16(*(__u16 *)(from_ptr + first));
- break;
- case 4:
- *(__be32 *)(to_ptr + first) =
- cpu_to_be32(*(__u32 *)(from_ptr + first));
- break;
- case 8:
- *(__be64 *)(to_ptr + first) =
- cpu_to_be64(*(__u64 *)(from_ptr + first));
- break;
- default:
- ASSERT(0);
- }
- }
+ to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
+ to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
+ to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
+ to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
+ to->sb_rextents = cpu_to_be64(from->sb_rextents);
+ memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
+ to->sb_logstart = cpu_to_be64(from->sb_logstart);
+ to->sb_rootino = cpu_to_be64(from->sb_rootino);
+ to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
+ to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
+ to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
+ to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
+ to->sb_agcount = cpu_to_be32(from->sb_agcount);
+ to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
+ to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
+ to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
+ to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
+ to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
+ to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
+ memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
+ to->sb_blocklog = from->sb_blocklog;
+ to->sb_sectlog = from->sb_sectlog;
+ to->sb_inodelog = from->sb_inodelog;
+ to->sb_inopblog = from->sb_inopblog;
+ to->sb_agblklog = from->sb_agblklog;
+ to->sb_rextslog = from->sb_rextslog;
+ to->sb_inprogress = from->sb_inprogress;
+ to->sb_imax_pct = from->sb_imax_pct;
+ to->sb_icount = cpu_to_be64(from->sb_icount);
+ to->sb_ifree = cpu_to_be64(from->sb_ifree);
+ to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
+ to->sb_frextents = cpu_to_be64(from->sb_frextents);
- fields &= ~(1LL << f);
+ to->sb_flags = from->sb_flags;
+ to->sb_shared_vn = from->sb_shared_vn;
+ to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
+ to->sb_unit = cpu_to_be32(from->sb_unit);
+ to->sb_width = cpu_to_be32(from->sb_width);
+ to->sb_dirblklog = from->sb_dirblklog;
+ to->sb_logsectlog = from->sb_logsectlog;
+ to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
+ to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
+
+ /*
+ * We need to ensure that bad_features2 always matches features2.
+ * Hence we enforce that here rather than having to remember to do it
+ * everywhere else that updates features2.
+ */
+ from->sb_bad_features2 = from->sb_features2;
+ to->sb_features2 = cpu_to_be32(from->sb_features2);
+ to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
+
+ if (xfs_sb_version_hascrc(from)) {
+ to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
+ to->sb_features_ro_compat =
+ cpu_to_be32(from->sb_features_ro_compat);
+ to->sb_features_incompat =
+ cpu_to_be32(from->sb_features_incompat);
+ to->sb_features_log_incompat =
+ cpu_to_be32(from->sb_features_log_incompat);
+ to->sb_pad = 0;
+ to->sb_lsn = cpu_to_be64(from->sb_lsn);
}
}
@@ -816,42 +759,51 @@ xfs_initialize_perag_data(
}
/*
- * xfs_mod_sb() can be used to copy arbitrary changes to the
- * in-core superblock into the superblock buffer to be logged.
- * It does not provide the higher level of locking that is
- * needed to protect the in-core superblock from concurrent
- * access.
+ * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
+ * into the superblock buffer to be logged. It does not provide the higher
+ * level of locking that is needed to protect the in-core superblock from
+ * concurrent access.
*/
void
-xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
+xfs_log_sb(
+ struct xfs_trans *tp)
{
- xfs_buf_t *bp;
- int first;
- int last;
- xfs_mount_t *mp;
- xfs_sb_field_t f;
-
- ASSERT(fields);
- if (!fields)
- return;
- mp = tp->t_mountp;
- bp = xfs_trans_getsb(tp, mp, 0);
- first = sizeof(xfs_sb_t);
- last = 0;
-
- /* translate/copy */
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_buf *bp = xfs_trans_getsb(tp, mp, 0);
- xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
+ xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
+ xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
+ xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb));
+}
- /* find modified range */
- f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
- ASSERT((1LL << f) & XFS_SB_MOD_BITS);
- last = xfs_sb_info[f + 1].offset - 1;
+/*
+ * xfs_sync_sb
+ *
+ * Sync the superblock to disk.
+ *
+ * Note that the caller is responsible for checking the frozen state of the
+ * filesystem. This procedure uses the non-blocking transaction allocator and
+ * thus will allow modifications to a frozen fs. This is required because this
+ * code can be called during the process of freezing where use of the high-level
+ * allocator would deadlock.
+ */
+int
+xfs_sync_sb(
+ struct xfs_mount *mp,
+ bool wait)
+{
+ struct xfs_trans *tp;
+ int error;
- f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
- ASSERT((1LL << f) & XFS_SB_MOD_BITS);
- first = xfs_sb_info[f].offset;
+ tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_CHANGE, KM_SLEEP);
+ error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
+ if (error) {
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
- xfs_trans_log_buf(tp, bp, first, last);
+ xfs_log_sb(tp);
+ if (wait)
+ xfs_trans_set_sync(tp);
+ return xfs_trans_commit(tp, 0);
}