[PATCH RFC 1/8] xfs: introduce inline data superblock feature bit

[Shan Hai <shan.hai@oracle.com>]

The data inlining is an on-disk format change, so introduce a new
superblock feature bit to work with the mkfs tool to handle the
inline data, the feature bit is set at mkfs time.

Signed-off-by: Shan Hai <shan.hai@oracle.com>
---
 fs/xfs/libxfs/xfs_format.h | 10 +++++++++-
 fs/xfs/libxfs/xfs_fs.h     |  1 +
 fs/xfs/libxfs/xfs_sb.c     |  2 ++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 059bc44c27e8..6066ba7fdaf7 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -469,10 +469,12 @@ xfs_sb_has_ro_compat_feature(
 #define XFS_SB_FEAT_INCOMPAT_FTYPE	(1 << 0)	/* filetype in dirent */
 #define XFS_SB_FEAT_INCOMPAT_SPINODES	(1 << 1)	/* sparse inode chunks */
 #define XFS_SB_FEAT_INCOMPAT_META_UUID	(1 << 2)	/* metadata UUID */
+#define XFS_SB_FEAT_INCOMPAT_INLINEDATA (1 << 3)	/* inline inode data */
 #define XFS_SB_FEAT_INCOMPAT_ALL \
 		(XFS_SB_FEAT_INCOMPAT_FTYPE|	\
 		 XFS_SB_FEAT_INCOMPAT_SPINODES|	\
-		 XFS_SB_FEAT_INCOMPAT_META_UUID)
+		 XFS_SB_FEAT_INCOMPAT_META_UUID|\
+		 XFS_SB_FEAT_INCOMPAT_INLINEDATA)
 
 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN	~XFS_SB_FEAT_INCOMPAT_ALL
 static inline bool
@@ -550,6 +552,12 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
 		(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK);
 }
 
+static inline bool xfs_sb_version_hasinlinedata(struct xfs_sb *sbp)
+{
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
+		(sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_INLINEDATA);
+}
+
 /*
  * end of superblock version macros
  */
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index f3aa59302fef..ee1f7621c0e4 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -210,6 +210,7 @@ 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_INLINEDATA	0x200000 /* inline data into inode */
 
 /*
  * 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 350119eeaecb..4002ed105b6b 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -1068,6 +1068,8 @@ xfs_fs_geometry(
 		geo->logsectsize = sbp->sb_logsectsize;
 	else
 		geo->logsectsize = BBSIZE;
+	if (xfs_sb_version_hasinlinedata(sbp))
+		geo->flags |= XFS_FSOP_GEOM_FLAGS_INLINEDATA;
 	geo->rtsectsize = sbp->sb_blocksize;
 	geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
 
-- 
2.11.0