[PATCH] xfs: define a version field for the AG geometry ioctl structure

[PATCH] xfs: define a version field for the AG geometry ioctl structure

[Darrick J. Wong]

From: Darrick J. Wong <darrick.wong@oracle.com>

Define a version field for the AG geometry ioctl structure.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_ag.c |    1 +
 fs/xfs/libxfs/xfs_fs.h |    4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index 5de296b34ab1..c54f7e6661d8 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -566,6 +566,7 @@ xfs_ag_get_geometry(
 	/* Fill out form. */
 	memset(ageo, 0, sizeof(*ageo));
 	ageo->ag_number = agno;
+	ageo->ag_version = XFS_AG_GEOM_VERSION_V0;
 
 	agi = XFS_BUF_TO_AGI(agi_bp);
 	ageo->ag_icount = be32_to_cpu(agi->agi_count);
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 52d03a3a02a4..9da8e602131b 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -287,7 +287,7 @@ struct xfs_ag_geometry {
 	uint32_t	ag_ifree;	/* o: inodes free */
 	uint32_t	ag_sick;	/* o: sick things in ag */
 	uint32_t	ag_checked;	/* o: checked metadata in ag */
-	uint32_t	ag_reserved32;	/* o: zero */
+	uint32_t	ag_version;	/* o: version of this structure */
 	uint64_t	ag_reserved[12];/* o: zero */
 };
 #define XFS_AG_GEOM_SICK_SB	(1 << 0)  /* superblock */
@@ -301,6 +301,8 @@ struct xfs_ag_geometry {
 #define XFS_AG_GEOM_SICK_RMAPBT	(1 << 8)  /* reverse mappings */
 #define XFS_AG_GEOM_SICK_REFCNTBT (1 << 9)  /* reference counts */
 
+#define XFS_AG_GEOM_VERSION_V0	(0)
+
 /*
  * Structures for XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG & XFS_IOC_FSGROWFSRT
  */