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authorDarrick J. Wong <darrick.wong@oracle.com>2016-10-03 16:11:13 (GMT)
committerDarrick J. Wong <darrick.wong@oracle.com>2016-10-03 16:11:13 (GMT)
commit0a6eab8bd4e0120d49511acbb294797d96ef9e4a (patch)
tree75d4eb84877c51938df3a31e217d0c789ab9f7d5
parent155cd433b516506df065866f3d974661f6473572 (diff)
downloadlinux-0a6eab8bd4e0120d49511acbb294797d96ef9e4a.tar.xz
vfs: support FS_XFLAG_COWEXTSIZE and get/set of CoW extent size hint
Introduce XFLAGs for the new XFS 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> Reviewed-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--include/uapi/linux/fs.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 3b00f7c..cf39876 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 +179,7 @@ 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_COWEXTSIZE 0x00010000 /* 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