Reserve a v5 read-only compatibility feature bit for the finobt and
create the xfs_sb_version_hasfinobt() helper to determine whether
an fs has the feature enabled.
The finobt does not change existing on-disk structures, but must
remain consistent with the ialloc btree. Modifications from older
kernels would violate that constrant. Therefore, we restrict older
kernels to read-only mounts of finobt-enabled filesystems.
Note that this does not yet enable the ability to rw mount a finobt
fs (by setting the feature bit in the XFS_SB_FEAT_RO_COMPAT_ALL
mask).
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
include/xfs_sb.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/xfs_sb.h b/include/xfs_sb.h
index c8d8898..83e037b 100644
--- a/include/xfs_sb.h
+++ b/include/xfs_sb.h
@@ -583,6 +583,7 @@ xfs_sb_has_compat_feature(
return (sbp->sb_features_compat & feature) != 0;
}
+#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
#define XFS_SB_FEAT_RO_COMPAT_ALL 0
#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
static inline bool
@@ -635,6 +636,12 @@ static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE);
}
+static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
+{
+ return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
+ (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
+}
+
/*
* end of superblock version macros
*/
--
1.8.1.4
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