[PATCH] vfs: support FS_XFLAG_REFLINK and FS_XFLAG_COWEXTSIZE

[PATCH] vfs: support FS_XFLAG_REFLINK and FS_XFLAG_COWEXTSIZE

[Darrick J. Wong]

Introduce XFLAGs for the new XFS reflink inode flag and the CoW extent
size hint, and actually plumb the CoW extent size hint into the fsxattr
structure.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 include/uapi/linux/fs.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 41e0433..c5975ef 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -157,7 +157,8 @@ struct fsxattr {
 	__u32		fsx_extsize;	/* extsize field value (get/set)*/
 	__u32		fsx_nextents;	/* nextents field value (get)	*/
 	__u32		fsx_projid;	/* project identifier (get/set) */
-	unsigned char	fsx_pad[12];
+	__u32		fsx_cowextsize;	/* CoW extsize field value (get/set)*/
+	unsigned char	fsx_pad[8];
 };
 
 /*
@@ -178,6 +179,8 @@ struct fsxattr {
 #define FS_XFLAG_NODEFRAG	0x00002000	/* do not defragment */
 #define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
 #define FS_XFLAG_DAX		0x00008000	/* use DAX for IO */
+#define FS_XFLAG_REFLINK	0x00010000	/* file is reflinked */
+#define FS_XFLAG_COWEXTSIZE	0x00020000	/* CoW extent size allocator hint */
 #define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/
 
 /* the read-only stuff doesn't really belong here, but any other place is

Re: [PATCH] vfs: support FS_XFLAG_REFLINK and FS_XFLAG_COWEXTSIZE

[Christoph Hellwig]

On Wed, Mar 02, 2016 at 03:56:38PM -0800, Darrick J. Wong wrote:
> Introduce XFLAGs for the new XFS reflink inode flag and the CoW extent
> size hint, and actually plumb the CoW extent size hint into the fsxattr
> structure.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

Looks fine,

Reviewed-by: Christoph Hellwig <hch@lst.de>