[PATCH 3/3] xfs_io: add support for changing the new inode DAX attribute

[Dave Chinner]

From: Dave Chinner <dchinner at redhat.com>

It is changed via the FS_IOC_FSSETXATTR ioctl, so add the new flag
to the platform definitions for  userspace that don't this API. Then
add support to the relevant xfs_io chattr and stat commands.

Signed-off-by: Dave Chinner <dchinner at redhat.com>
---
 include/darwin.h  | 1 +
 include/freebsd.h | 1 +
 include/irix.h    | 1 +
 include/linux.h   | 1 +
 io/attr.c         | 5 ++++-
 5 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/darwin.h b/include/darwin.h
index 2baa536..a52030d 100644
--- a/include/darwin.h
+++ b/include/darwin.h
@@ -312,6 +312,7 @@ struct fsxattr {
 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
 #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_HASATTR	0x80000000	/* no DIFLAG for this	*/
 
 #define FS_IOC_FSGETXATTR     _IOR ('X', 31, struct fsxattr)
diff --git a/include/freebsd.h b/include/freebsd.h
index fe567d4..f7e0c75 100644
--- a/include/freebsd.h
+++ b/include/freebsd.h
@@ -202,6 +202,7 @@ struct fsxattr {
 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
 #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_HASATTR	0x80000000	/* no DIFLAG for this	*/
 
 #define FS_IOC_FSGETXATTR     _IOR ('X', 31, struct fsxattr)
diff --git a/include/irix.h b/include/irix.h
index bdb4b6a..c2191ee 100644
--- a/include/irix.h
+++ b/include/irix.h
@@ -447,6 +447,7 @@ struct fsxattr {
 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
 #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_HASATTR	0x80000000	/* no DIFLAG for this	*/
 
 #define FS_IOC_FSGETXATTR		F_FSGETXATTR
diff --git a/include/linux.h b/include/linux.h
index 17391c3..cc0f70c 100644
--- a/include/linux.h
+++ b/include/linux.h
@@ -205,6 +205,7 @@ struct fsxattr {
 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
 #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_HASATTR	0x80000000	/* no DIFLAG for this	*/
 
 #define FS_IOC_FSGETXATTR     _IOR ('X', 31, struct fsxattr)
diff --git a/io/attr.c b/io/attr.c
index 6fa08bf..0186b1d 100644
--- a/io/attr.c
+++ b/io/attr.c
@@ -47,9 +47,10 @@ static struct xflags {
 	{ FS_XFLAG_EXTSZINHERIT,	"E", "extsz-inherit"	},
 	{ FS_XFLAG_NODEFRAG,		"f", "no-defrag"	},
 	{ FS_XFLAG_FILESTREAM,		"S", "filestream"	},
+	{ FS_XFLAG_DAX,			"x", "dax"		},
 	{ 0, NULL, NULL }
 };
-#define CHATTR_XFLAG_LIST	"r"/*p*/"iasAdtPneEfS"
+#define CHATTR_XFLAG_LIST	"r"/*p*/"iasAdtPneEfSx"
 
 static void
 lsattr_help(void)
@@ -73,6 +74,7 @@ lsattr_help(void)
 " E -- children created in this directory inherit the extent size value\n"
 " f -- do not include this file when defragmenting the filesystem\n"
 " S -- enable filestreams allocator for this directory\n"
+" x -- Use direct access (DAX) for data in this file\n"
 "\n"
 " Options:\n"
 " -R -- recursively descend (useful when current file is a directory)\n"
@@ -108,6 +110,7 @@ chattr_help(void)
 " +/-E -- set/clear the extent-size inheritance flag\n"
 " +/-f -- set/clear the no-defrag flag\n"
 " +/-S -- set/clear the filestreams allocator flag\n"
+" +/-x -- set/clear the direct access (DAX) flag\n"
 " Note1: user must have certain capabilities to modify immutable/append-only.\n"
 " Note2: immutable/append-only files cannot be deleted; removing these files\n"
 "        requires the immutable/append-only flag to be cleared first.\n"
-- 
2.5.0