xfs: define the on-disk format for the metadir feature

Define the on-disk layout and feature flags for the metadata inode
directory feature.  Add a xfs_sb_version_hasmetadir for benefit of
xfs_repair, which needs to know where the new end of the superblock
lies.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>

1 files changed, 14 insertions, 0 deletions

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index df7262f4674f..b6e959563547 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -65,6 +65,7 @@ typedef struct xfs_inode {
 		uint16_t	i_flushiter;	/* incremented on flush */
 	};
 	uint8_t			i_forkoff;	/* attr fork offset >> 3 */
+	enum xfs_metafile_type	i_metatype;	/* XFS_METAFILE_* */
 	uint16_t		i_diflags;	/* XFS_DIFLAG_... */
 	uint64_t		i_diflags2;	/* XFS_DIFLAG2_... */
 	struct timespec64	i_crtime;	/* time created */
@@ -276,10 +277,23 @@ static inline bool xfs_is_reflink_inode(const struct xfs_inode *ip)
 	return ip->i_diflags2 & XFS_DIFLAG2_REFLINK;
 }
 
+static inline bool xfs_is_metadir_inode(const struct xfs_inode *ip)
+{
+	return ip->i_diflags2 & XFS_DIFLAG2_METADATA;
+}
+
 static inline bool xfs_is_internal_inode(const struct xfs_inode *ip)
 {
 	struct xfs_mount	*mp = ip->i_mount;
 
+	/* Any file in the metadata directory tree is a metadata inode. */
+	if (xfs_has_metadir(mp))
+		return xfs_is_metadir_inode(ip);
+
+	/*
+	 * Before metadata directories, the only metadata inodes were the
+	 * three quota files, the realtime bitmap, and the realtime summary.
+	 */
 	return ip->i_ino == mp->m_sb.sb_rbmino ||
 	       ip->i_ino == mp->m_sb.sb_rsumino ||
 	       xfs_is_quota_inode(&mp->m_sb, ip->i_ino);