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authorDave Chinner <dchinner@redhat.com>2014-05-20 07:47:05 +1000
committerDave Chinner <david@fromorbit.com>2014-05-20 07:47:05 +1000
commitab3e57b53f549ad51cbdf85e846ca4eaf0f3be30 (patch)
tree49db4b1146fbef41b0a0fa512e4415e2b2527084 /fs/xfs
parent5d074a4f8005b988c9d48d29250e36ad64083252 (diff)
xfs: remove shared supberlock feature checking
We reject any filesystem that is mounted with this feature bit set, so we don't need to check for it anywhere else. Remove the function for checking if the feature bit is set and any code that uses it. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_fsops.c2
-rw-r--r--fs/xfs/xfs_sb.c3
-rw-r--r--fs/xfs/xfs_sb.h17
3 files changed, 6 insertions, 16 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index b19b01576944..c31ac96349d2 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -84,8 +84,6 @@ xfs_fs_geometry(
XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
(xfs_sb_version_hasdalign(&mp->m_sb) ?
XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
- (xfs_sb_version_hasshared(&mp->m_sb) ?
- XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
(xfs_sb_version_hasextflgbit(&mp->m_sb) ?
XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
(xfs_sb_version_hassector(&mp->m_sb) ?
diff --git a/fs/xfs/xfs_sb.c b/fs/xfs/xfs_sb.c
index de16dd558195..c3453b11f563 100644
--- a/fs/xfs/xfs_sb.c
+++ b/fs/xfs/xfs_sb.c
@@ -291,7 +291,8 @@ xfs_mount_validate_sb(
(sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) ||
sbp->sb_dblocks == 0 ||
sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) ||
- sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) {
+ sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) ||
+ sbp->sb_shared_vn != 0)) {
xfs_notice(mp, "SB sanity check failed");
return XFS_ERROR(EFSCORRUPTED);
}
diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index 822e62819741..86a964cc6925 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -51,11 +51,12 @@ struct xfs_trans;
/*
* Supported feature bit list is just all bits in the versionnum field because
- * we've used them all up and understand them all.
+ * we've used them all up and understand them all. Except, of course, for the
+ * shared superblock bit, which nobody knows what it does and so is unsupported.
*/
#define XFS_SB_VERSION_OKBITS \
- (XFS_SB_VERSION_NUMBITS | \
- XFS_SB_VERSION_ALLFBITS)
+ ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
+ ~XFS_SB_VERSION_SHAREDBIT)
/*
* There are two words to hold XFS "feature" bits: the original
@@ -341,10 +342,6 @@ static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
(sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
return false;
- /* We don't support shared superblocks - nobody knows what it is */
- if (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT)
- return false;
-
return true;
}
@@ -397,12 +394,6 @@ static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
}
-static inline bool xfs_sb_version_hasshared(struct xfs_sb *sbp)
-{
- return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
- (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
-}
-
static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||