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Commit 0a6eab8b authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 155cd433

include/uapi/linux/fs.h

+3 −1
Original line number Diff line number Diff line
@@ -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