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SubjectRe: [PATCH 1/2 v2] xfs: introduce a generic shutdown ioctl
Change log from v1:
o modify the xfs changes merged toward 3.20-rc1

-- >8 --

This patch introduces a generic ioctl for fs shutdown, which was used by xfs.

If this shutdown is triggered, filesystem stops any further IOs according to the
following options.

1. FS_GOING_DOWN_FULLSYNC
: this will flush all the data and dentry blocks, and do checkpoint before
shutdown.

2. FS_GOING_DOWN_METASYNC
: this will do checkpoint before shutdown.

3. FS_GOING_DOWN_NOSYNC
: this will trigger shutdown as is.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/xfs/libxfs/xfs_fs.h | 8 ++++----
include/uapi/linux/fs.h | 8 ++++++++
2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 18dc721..fe0eeee 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -484,9 +484,9 @@ typedef struct xfs_swapext
/*
* Flags for going down operation
*/
-#define XFS_FSOP_GOING_FLAGS_DEFAULT 0x0 /* going down */
-#define XFS_FSOP_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
-#define XFS_FSOP_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
+#define XFS_FSOP_GOING_FLAGS_DEFAULT FS_GOING_DOWN_FULLSYNC
+#define XFS_FSOP_GOING_FLAGS_LOGFLUSH FS_GOING_DOWN_METASYNC
+#define XFS_FSOP_GOING_FLAGS_NOLOGFLUSH FS_GOING_DOWN_NOSYNC

/*
* ioctl commands that are used by Linux filesystems
@@ -555,7 +555,7 @@ typedef struct xfs_swapext
#define XFS_IOC_ATTRLIST_BY_HANDLE _IOW ('X', 122, struct xfs_fsop_attrlist_handlereq)
#define XFS_IOC_ATTRMULTI_BY_HANDLE _IOW ('X', 123, struct xfs_fsop_attrmulti_handlereq)
#define XFS_IOC_FSGEOMETRY _IOR ('X', 124, struct xfs_fsop_geom)
-#define XFS_IOC_GOINGDOWN _IOR ('X', 125, __uint32_t)
+#define XFS_IOC_GOINGDOWN FS_IOC_SHUTDOWN
/* XFS_IOC_GETFSUUID ---------- deprecated 140 */


diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 3735fa0..a4e4be5 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -157,6 +157,7 @@ struct inodes_stat_t {
#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
#define FITHAW _IOWR('X', 120, int) /* Thaw */
#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
+#define FS_IOC_SHUTDOWN _IOR('X', 125, __u32) /* Shutdown */

#define FS_IOC_GETFLAGS _IOR('f', 1, long)
#define FS_IOC_SETFLAGS _IOW('f', 2, long)
@@ -205,4 +206,11 @@ struct inodes_stat_t {
#define SYNC_FILE_RANGE_WRITE 2
#define SYNC_FILE_RANGE_WAIT_AFTER 4

+/*
+ * Flags for going down operation used by FS_IOC_GOINGDOWN
+ */
+#define FS_GOING_DOWN_FULLSYNC 0x0 /* going down with full sync */
+#define FS_GOING_DOWN_METASYNC 0x1 /* going down with metadata */
+#define FS_GOING_DOWN_NOSYNC 0x2 /* going down */
+
#endif /* _UAPI_LINUX_FS_H */
--
2.1.1


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