[dchinner: forward ported and cleaned up]
[achender: rebased and added parent pointer attribute to
compatible attributes mask]
Signed-off-by: Mark Tinguely <tinguely@xxxxxxx>
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_format.h | 7 +++++--
fs/xfs/libxfs/xfs_fs.h | 1 +
fs/xfs/libxfs/xfs_sb.c | 2 ++
fs/xfs/xfs_super.c | 4 ++++
4 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 5e946c8..d05ffc5 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -462,10 +462,12 @@ xfs_sb_has_compat_feature(
#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
#define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
+#define XFS_SB_FEAT_RO_COMPAT_PARENT (1 << 3) /* parent inode ptr */
#define XFS_SB_FEAT_RO_COMPAT_ALL \
(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
- XFS_SB_FEAT_RO_COMPAT_REFLINK)
+ XFS_SB_FEAT_RO_COMPAT_REFLINK| \
+ XFS_SB_FEAT_RO_COMPAT_PARENT)
#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
static inline bool
xfs_sb_has_ro_compat_feature(
@@ -561,7 +563,8 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
static inline bool xfs_sb_version_hasparent(struct xfs_sb *sbp)
{
- return false; /* We'll enable this at the end of the set */
+ return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
+ (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_PARENT));
}
/*
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index faf1a4e..641e0af 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -222,6 +222,7 @@ typedef struct xfs_fsop_resblks {
#define XFS_FSOP_GEOM_FLAGS_SPINODES 0x40000 /* sparse inode chunks */
#define XFS_FSOP_GEOM_FLAGS_RMAPBT 0x80000 /* reverse mapping btree */
#define XFS_FSOP_GEOM_FLAGS_REFLINK 0x100000 /* files can share blocks */
+#define XFS_FSOP_GEOM_FLAGS_PARENT 0x200000 /* parent pointers */
/*
* Minimum and maximum sizes need for growth checks.
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index d9b94bd..e1f0ac1 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -955,6 +955,8 @@ xfs_fs_geometry(
geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
if (xfs_sb_version_hasreflink(sbp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
+ if(xfs_sb_version_hasparent(sbp))
+ geo->flags |= XFS_FSOP_GEOM_FLAGS_PARENT;
if (xfs_sb_version_hassector(sbp))
geo->logsectsize = sbp->sb_logsectsize;
else
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index dce3baf..366deee 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1731,6 +1731,10 @@ xfs_fs_fill_super(
goto out_filestream_unmount;
}
+ if (xfs_sb_version_hasparent(&mp->m_sb))
+ xfs_alert(mp,
+ "EXPERIMENTAL parent pointer feature enabled. Use at your own risk!");
+
error = xfs_mountfs(mp);
if (error)
goto out_filestream_unmount;
--
2.7.4
--
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