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

Dave Chinner
2016-02-15T05:32:35Z

From: Dave Chinner <dchinner@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@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