xfs: reserve v5 superblock read-only compat. feature bit for finobt
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@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Родитель
57bd3dbe40
Коммит
8e2c84df20
|
@ -587,6 +587,7 @@ 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
|
||||
|
@ -641,6 +642,12 @@ static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
|
|||
(sbp->sb_features2 & XFS_SB_VERSION2_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
|
||||
*/
|
||||
|
|
Загрузка…
Ссылка в новой задаче