Merge tag 'xfs-for-linus-4.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs

Pull more xfs updates from Dave Chinner:
 "This is the second update for XFS that I mentioned in the original
  pull request last week.

  It contains a revert for a suspend regression in 4.4 and a fix for a
  long standing log recovery issue that has been further exposed by all
  the log recovery changes made in the original 4.5 merge.

  There is one more thing in this pull request - one that I forgot to
  merge into the origin.  That is, pulling the XFS_IOC_FS[GS]ETXATTR
  ioctl up to the VFS level so that other filesystems can also use it
  for modifying project quota IDs

  Summary:

   - promotion of XFS_IOC_FS[GS]ETXATTR ioctl to the vfs level so that
     it can be shared with other filesystems.  The ext4 project quota
     functionality is the first target for this.  The commits in this
     series have not been updated with review or final SOB tags because
     the branch they were originally published in was needed by ext4.
     Those tags are:
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Dave Chinner <david@fromrobit.com>

   - Revert a change that is causing suspend failures.

   - Fix a use-after-free that can occur on log mount failures.  Been
     around forever, but now exposed by other changes to log recovery
     made in the first 4.5 merge"

* tag 'xfs-for-linus-4.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
  xfs: log mount failures don't wait for buffers to be released
  Revert "xfs: clear PF_NOFREEZE for xfsaild kthread"
  xfs: introduce per-inode DAX enablement
  xfs: use FS_XFLAG definitions directly
  fs: XFS_IOC_FS[SG]SETXATTR to FS_IOC_FS[SG]ETXATTR promotion

fs/xfs/libxfs/xfs_format.h

@@ -984,8 +984,6 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
 
 /*
  * Values for di_flags
- * There should be a one-to-one correspondence between these flags and the
- * XFS_XFLAG_s.
  */
 #define XFS_DIFLAG_REALTIME_BIT  0	/* file's blocks come from rt area */
 #define XFS_DIFLAG_PREALLOC_BIT  1	/* file space has been preallocated */
@@ -1025,6 +1023,15 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
 	 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
 	 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
 
+/*
+ * Values for di_flags2 These start by being exposed to userspace in the upper
+ * 16 bits of the XFS_XFLAG_s range.
+ */
+#define XFS_DIFLAG2_DAX_BIT	0	/* use DAX for this inode */
+#define XFS_DIFLAG2_DAX		(1 << XFS_DIFLAG2_DAX_BIT)
+
+#define XFS_DIFLAG2_ANY		(XFS_DIFLAG2_DAX)
+
 /*
  * Inode number format:
  * low inopblog bits - offset in block

fs/xfs/libxfs/xfs_fs.h

@@ -35,40 +35,6 @@ struct dioattr {
 };
 #endif
 
-/*
- * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
- */
-#ifndef HAVE_FSXATTR
-struct fsxattr {
-	__u32		fsx_xflags;	/* xflags field value (get/set) */
-	__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];
-};
-#endif
-
-/*
- * Flags for the bs_xflags/fsx_xflags field
- * There should be a one-to-one correspondence between these flags and the
- * XFS_DIFLAG_s.
- */
-#define XFS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */
-#define XFS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
-#define XFS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
-#define XFS_XFLAG_APPEND	0x00000010	/* all writes append */
-#define XFS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
-#define XFS_XFLAG_NOATIME	0x00000040	/* do not update access time */
-#define XFS_XFLAG_NODUMP	0x00000080	/* do not include in backups */
-#define XFS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
-#define XFS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
-#define XFS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
-#define XFS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
-#define XFS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
-#define XFS_XFLAG_NODEFRAG	0x00002000  	/* do not defragment */
-#define XFS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
-#define XFS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/
-
 /*
  * Structure for XFS_IOC_GETBMAP.
  * On input, fill in bmv_offset and bmv_length of the first structure
@@ -514,8 +480,8 @@ typedef struct xfs_swapext
 #define XFS_IOC_ALLOCSP		_IOW ('X', 10, struct xfs_flock64)
 #define XFS_IOC_FREESP		_IOW ('X', 11, struct xfs_flock64)
 #define XFS_IOC_DIOINFO		_IOR ('X', 30, struct dioattr)
-#define XFS_IOC_FSGETXATTR	_IOR ('X', 31, struct fsxattr)
-#define XFS_IOC_FSSETXATTR	_IOW ('X', 32, struct fsxattr)
+#define XFS_IOC_FSGETXATTR	FS_IOC_FSGETXATTR
+#define XFS_IOC_FSSETXATTR	FS_IOC_FSSETXATTR
 #define XFS_IOC_ALLOCSP64	_IOW ('X', 36, struct xfs_flock64)
 #define XFS_IOC_FREESP64	_IOW ('X', 37, struct xfs_flock64)
 #define XFS_IOC_GETBMAP		_IOWR('X', 38, struct getbmap)

fs/xfs/xfs_buf.c

@@ -1527,6 +1527,16 @@ xfs_wait_buftarg(
 	LIST_HEAD(dispose);
 	int loop = 0;
 
+	/*
+	 * We need to flush the buffer workqueue to ensure that all IO
+	 * completion processing is 100% done. Just waiting on buffer locks is
+	 * not sufficient for async IO as the reference count held over IO is
+	 * not released until after the buffer lock is dropped. Hence we need to
+	 * ensure here that all reference counts have been dropped before we
+	 * start walking the LRU list.
+	 */
+	drain_workqueue(btp->bt_mount->m_buf_workqueue);
+
 	/* loop until there is nothing left on the lru list. */
 	while (list_lru_count(&btp->bt_lru)) {
 		list_lru_walk(&btp->bt_lru, xfs_buftarg_wait_rele,

fs/xfs/xfs_inode.c

@@ -610,60 +610,69 @@ __xfs_iflock(
 
 STATIC uint
 _xfs_dic2xflags(
-	__uint16_t		di_flags)
+	__uint16_t		di_flags,
+	uint64_t		di_flags2,
+	bool			has_attr)
 {
 	uint			flags = 0;
 
 	if (di_flags & XFS_DIFLAG_ANY) {
 		if (di_flags & XFS_DIFLAG_REALTIME)
-			flags |= XFS_XFLAG_REALTIME;
+			flags |= FS_XFLAG_REALTIME;
 		if (di_flags & XFS_DIFLAG_PREALLOC)
-			flags |= XFS_XFLAG_PREALLOC;
+			flags |= FS_XFLAG_PREALLOC;
 		if (di_flags & XFS_DIFLAG_IMMUTABLE)
-			flags |= XFS_XFLAG_IMMUTABLE;
+			flags |= FS_XFLAG_IMMUTABLE;
 		if (di_flags & XFS_DIFLAG_APPEND)
-			flags |= XFS_XFLAG_APPEND;
+			flags |= FS_XFLAG_APPEND;
 		if (di_flags & XFS_DIFLAG_SYNC)
-			flags |= XFS_XFLAG_SYNC;
+			flags |= FS_XFLAG_SYNC;
 		if (di_flags & XFS_DIFLAG_NOATIME)
-			flags |= XFS_XFLAG_NOATIME;
+			flags |= FS_XFLAG_NOATIME;
 		if (di_flags & XFS_DIFLAG_NODUMP)
-			flags |= XFS_XFLAG_NODUMP;
+			flags |= FS_XFLAG_NODUMP;
 		if (di_flags & XFS_DIFLAG_RTINHERIT)
-			flags |= XFS_XFLAG_RTINHERIT;
+			flags |= FS_XFLAG_RTINHERIT;
 		if (di_flags & XFS_DIFLAG_PROJINHERIT)
-			flags |= XFS_XFLAG_PROJINHERIT;
+			flags |= FS_XFLAG_PROJINHERIT;
 		if (di_flags & XFS_DIFLAG_NOSYMLINKS)
-			flags |= XFS_XFLAG_NOSYMLINKS;
+			flags |= FS_XFLAG_NOSYMLINKS;
 		if (di_flags & XFS_DIFLAG_EXTSIZE)
-			flags |= XFS_XFLAG_EXTSIZE;
+			flags |= FS_XFLAG_EXTSIZE;
 		if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
-			flags |= XFS_XFLAG_EXTSZINHERIT;
+			flags |= FS_XFLAG_EXTSZINHERIT;
 		if (di_flags & XFS_DIFLAG_NODEFRAG)
-			flags |= XFS_XFLAG_NODEFRAG;
+			flags |= FS_XFLAG_NODEFRAG;
 		if (di_flags & XFS_DIFLAG_FILESTREAM)
-			flags |= XFS_XFLAG_FILESTREAM;
+			flags |= FS_XFLAG_FILESTREAM;
 	}
 
+	if (di_flags2 & XFS_DIFLAG2_ANY) {
+		if (di_flags2 & XFS_DIFLAG2_DAX)
+			flags |= FS_XFLAG_DAX;
+	}
+
+	if (has_attr)
+		flags |= FS_XFLAG_HASATTR;
+
 	return flags;
 }
 
 uint
 xfs_ip2xflags(
-	xfs_inode_t		*ip)
+	struct xfs_inode	*ip)
 {
-	xfs_icdinode_t		*dic = &ip->i_d;
+	struct xfs_icdinode	*dic = &ip->i_d;
 
-	return _xfs_dic2xflags(dic->di_flags) |
-				(XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0);
+	return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
 }
 
 uint
 xfs_dic2xflags(
-	xfs_dinode_t		*dip)
+	struct xfs_dinode	*dip)
 {
-	return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) |
-				(XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
+	return _xfs_dic2xflags(be16_to_cpu(dip->di_flags),
+				be64_to_cpu(dip->di_flags2), XFS_DFORK_Q(dip));
 }
 
 /*
@@ -862,7 +871,8 @@ xfs_ialloc(
 	case S_IFREG:
 	case S_IFDIR:
 		if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
-			uint	di_flags = 0;
+			uint64_t	di_flags2 = 0;
+			uint		di_flags = 0;
 
 			if (S_ISDIR(mode)) {
 				if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
@@ -898,7 +908,11 @@ xfs_ialloc(
 				di_flags |= XFS_DIFLAG_NODEFRAG;
 			if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
 				di_flags |= XFS_DIFLAG_FILESTREAM;
+			if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
+				di_flags2 |= XFS_DIFLAG2_DAX;
+
 			ip->i_d.di_flags |= di_flags;
+			ip->i_d.di_flags2 |= di_flags2;
 		}
 		/* FALLTHROUGH */
 	case S_IFLNK:

fs/xfs/xfs_ioctl.c

@@ -859,25 +859,25 @@ xfs_merge_ioc_xflags(
 	unsigned int	xflags = start;
 
 	if (flags & FS_IMMUTABLE_FL)
-		xflags |= XFS_XFLAG_IMMUTABLE;
+		xflags |= FS_XFLAG_IMMUTABLE;
 	else
-		xflags &= ~XFS_XFLAG_IMMUTABLE;
+		xflags &= ~FS_XFLAG_IMMUTABLE;
 	if (flags & FS_APPEND_FL)
-		xflags |= XFS_XFLAG_APPEND;
+		xflags |= FS_XFLAG_APPEND;
 	else
-		xflags &= ~XFS_XFLAG_APPEND;
+		xflags &= ~FS_XFLAG_APPEND;
 	if (flags & FS_SYNC_FL)
-		xflags |= XFS_XFLAG_SYNC;
+		xflags |= FS_XFLAG_SYNC;
 	else
-		xflags &= ~XFS_XFLAG_SYNC;
+		xflags &= ~FS_XFLAG_SYNC;
 	if (flags & FS_NOATIME_FL)
-		xflags |= XFS_XFLAG_NOATIME;
+		xflags |= FS_XFLAG_NOATIME;
 	else
-		xflags &= ~XFS_XFLAG_NOATIME;
+		xflags &= ~FS_XFLAG_NOATIME;
 	if (flags & FS_NODUMP_FL)
-		xflags |= XFS_XFLAG_NODUMP;
+		xflags |= FS_XFLAG_NODUMP;
 	else
-		xflags &= ~XFS_XFLAG_NODUMP;
+		xflags &= ~FS_XFLAG_NODUMP;
 
 	return xflags;
 }
@@ -945,40 +945,51 @@ xfs_set_diflags(
 	unsigned int		xflags)
 {
 	unsigned int		di_flags;
+	uint64_t		di_flags2;
 
 	/* can't set PREALLOC this way, just preserve it */
 	di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
-	if (xflags & XFS_XFLAG_IMMUTABLE)
+	if (xflags & FS_XFLAG_IMMUTABLE)
 		di_flags |= XFS_DIFLAG_IMMUTABLE;
-	if (xflags & XFS_XFLAG_APPEND)
+	if (xflags & FS_XFLAG_APPEND)
 		di_flags |= XFS_DIFLAG_APPEND;
-	if (xflags & XFS_XFLAG_SYNC)
+	if (xflags & FS_XFLAG_SYNC)
 		di_flags |= XFS_DIFLAG_SYNC;
-	if (xflags & XFS_XFLAG_NOATIME)
+	if (xflags & FS_XFLAG_NOATIME)
 		di_flags |= XFS_DIFLAG_NOATIME;
-	if (xflags & XFS_XFLAG_NODUMP)
+	if (xflags & FS_XFLAG_NODUMP)
 		di_flags |= XFS_DIFLAG_NODUMP;
-	if (xflags & XFS_XFLAG_NODEFRAG)
+	if (xflags & FS_XFLAG_NODEFRAG)
 		di_flags |= XFS_DIFLAG_NODEFRAG;
-	if (xflags & XFS_XFLAG_FILESTREAM)
+	if (xflags & FS_XFLAG_FILESTREAM)
 		di_flags |= XFS_DIFLAG_FILESTREAM;
 	if (S_ISDIR(ip->i_d.di_mode)) {
-		if (xflags & XFS_XFLAG_RTINHERIT)
+		if (xflags & FS_XFLAG_RTINHERIT)
 			di_flags |= XFS_DIFLAG_RTINHERIT;
-		if (xflags & XFS_XFLAG_NOSYMLINKS)
+		if (xflags & FS_XFLAG_NOSYMLINKS)
 			di_flags |= XFS_DIFLAG_NOSYMLINKS;
-		if (xflags & XFS_XFLAG_EXTSZINHERIT)
+		if (xflags & FS_XFLAG_EXTSZINHERIT)
 			di_flags |= XFS_DIFLAG_EXTSZINHERIT;
-		if (xflags & XFS_XFLAG_PROJINHERIT)
+		if (xflags & FS_XFLAG_PROJINHERIT)
 			di_flags |= XFS_DIFLAG_PROJINHERIT;
 	} else if (S_ISREG(ip->i_d.di_mode)) {
-		if (xflags & XFS_XFLAG_REALTIME)
+		if (xflags & FS_XFLAG_REALTIME)
 			di_flags |= XFS_DIFLAG_REALTIME;
-		if (xflags & XFS_XFLAG_EXTSIZE)
+		if (xflags & FS_XFLAG_EXTSIZE)
 			di_flags |= XFS_DIFLAG_EXTSIZE;
 	}
-
 	ip->i_d.di_flags = di_flags;
+
+	/* diflags2 only valid for v3 inodes. */
+	if (ip->i_d.di_version < 3)
+		return;
+
+	di_flags2 = 0;
+	if (xflags & FS_XFLAG_DAX)
+		di_flags2 |= XFS_DIFLAG2_DAX;
+
+	ip->i_d.di_flags2 = di_flags2;
+
 }
 
 STATIC void
@@ -988,22 +999,27 @@ xfs_diflags_to_linux(
 	struct inode		*inode = VFS_I(ip);
 	unsigned int		xflags = xfs_ip2xflags(ip);
 
-	if (xflags & XFS_XFLAG_IMMUTABLE)
+	if (xflags & FS_XFLAG_IMMUTABLE)
 		inode->i_flags |= S_IMMUTABLE;
 	else
 		inode->i_flags &= ~S_IMMUTABLE;
-	if (xflags & XFS_XFLAG_APPEND)
+	if (xflags & FS_XFLAG_APPEND)
 		inode->i_flags |= S_APPEND;
 	else
 		inode->i_flags &= ~S_APPEND;
-	if (xflags & XFS_XFLAG_SYNC)
+	if (xflags & FS_XFLAG_SYNC)
 		inode->i_flags |= S_SYNC;
 	else
 		inode->i_flags &= ~S_SYNC;
-	if (xflags & XFS_XFLAG_NOATIME)
+	if (xflags & FS_XFLAG_NOATIME)
 		inode->i_flags |= S_NOATIME;
 	else
 		inode->i_flags &= ~S_NOATIME;
+	if (xflags & FS_XFLAG_DAX)
+		inode->i_flags |= S_DAX;
+	else
+		inode->i_flags &= ~S_DAX;
+
 }
 
 static int
@@ -1016,11 +1032,11 @@ xfs_ioctl_setattr_xflags(
 
 	/* Can't change realtime flag if any extents are allocated. */
 	if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
-	    XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & XFS_XFLAG_REALTIME))
+	    XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & FS_XFLAG_REALTIME))
 		return -EINVAL;
 
 	/* If realtime flag is set then must have realtime device */
-	if (fa->fsx_xflags & XFS_XFLAG_REALTIME) {
+	if (fa->fsx_xflags & FS_XFLAG_REALTIME) {
 		if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
 		    (ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
 			return -EINVAL;
@@ -1031,7 +1047,7 @@ xfs_ioctl_setattr_xflags(
 	 * we have appropriate permission.
 	 */
 	if (((ip->i_d.di_flags & (XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND)) ||
-	     (fa->fsx_xflags & (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) &&
+	     (fa->fsx_xflags & (FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND))) &&
 	    !capable(CAP_LINUX_IMMUTABLE))
 		return -EPERM;
 
@@ -1095,8 +1111,8 @@ xfs_ioctl_setattr_get_trans(
  * extent size hint validation is somewhat cumbersome. Rules are:
  *
  * 1. extent size hint is only valid for directories and regular files
- * 2. XFS_XFLAG_EXTSIZE is only valid for regular files
- * 3. XFS_XFLAG_EXTSZINHERIT is only valid for directories.
+ * 2. FS_XFLAG_EXTSIZE is only valid for regular files
+ * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
  * 4. can only be changed on regular files if no extents are allocated
  * 5. can be changed on directories at any time
  * 6. extsize hint of 0 turns off hints, clears inode flags.
@@ -1112,10 +1128,10 @@ xfs_ioctl_setattr_check_extsize(
 {
 	struct xfs_mount	*mp = ip->i_mount;
 
-	if ((fa->fsx_xflags & XFS_XFLAG_EXTSIZE) && !S_ISREG(ip->i_d.di_mode))
+	if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(ip->i_d.di_mode))
 		return -EINVAL;
 
-	if ((fa->fsx_xflags & XFS_XFLAG_EXTSZINHERIT) &&
+	if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
 	    !S_ISDIR(ip->i_d.di_mode))
 		return -EINVAL;
 
@@ -1132,7 +1148,7 @@ xfs_ioctl_setattr_check_extsize(
 			return -EINVAL;
 
 		if (XFS_IS_REALTIME_INODE(ip) ||
-		    (fa->fsx_xflags & XFS_XFLAG_REALTIME)) {
+		    (fa->fsx_xflags & FS_XFLAG_REALTIME)) {
 			size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
 		} else {
 			size = mp->m_sb.sb_blocksize;
@@ -1143,7 +1159,7 @@ xfs_ioctl_setattr_check_extsize(
 		if (fa->fsx_extsize % size)
 			return -EINVAL;
 	} else
-		fa->fsx_xflags &= ~(XFS_XFLAG_EXTSIZE | XFS_XFLAG_EXTSZINHERIT);
+		fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
 
 	return 0;
 }
@@ -1168,7 +1184,7 @@ xfs_ioctl_setattr_check_projid(
 
 	if (xfs_get_projid(ip) != fa->fsx_projid)
 		return -EINVAL;
-	if ((fa->fsx_xflags & XFS_XFLAG_PROJINHERIT) !=
+	if ((fa->fsx_xflags & FS_XFLAG_PROJINHERIT) !=
 	    (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
 		return -EINVAL;
 

fs/xfs/xfs_iops.c

@@ -1205,8 +1205,8 @@ xfs_diflags_to_iflags(
 		inode->i_flags |= S_SYNC;
 	if (flags & XFS_DIFLAG_NOATIME)
 		inode->i_flags |= S_NOATIME;
-	/* XXX: Also needs an on-disk per inode flag! */
-	if (ip->i_mount->m_flags & XFS_MOUNT_DAX)
+	if (ip->i_mount->m_flags & XFS_MOUNT_DAX ||
+	    ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
 		inode->i_flags |= S_DAX;
 }
 

fs/xfs/xfs_trans_ail.c

@@ -497,7 +497,6 @@ xfsaild(
 	long		tout = 0;	/* milliseconds */
 
 	current->flags |= PF_MEMALLOC;
-	set_freezable();
 
 	while (!kthread_should_stop()) {
 		if (tout && tout <= 20)

include/uapi/linux/fs.h

@@ -146,6 +146,37 @@ struct inodes_stat_t {
 #define MS_MGC_VAL 0xC0ED0000
 #define MS_MGC_MSK 0xffff0000
 
+/*
+ * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.
+ */
+struct fsxattr {
+	__u32		fsx_xflags;	/* xflags field value (get/set) */
+	__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];
+};
+
+/*
+ * Flags for the fsx_xflags field
+ */
+#define FS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */
+#define FS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
+#define FS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
+#define FS_XFLAG_APPEND		0x00000010	/* all writes append */
+#define FS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
+#define FS_XFLAG_NOATIME	0x00000040	/* do not update access time */
+#define FS_XFLAG_NODUMP		0x00000080	/* do not include in backups */
+#define FS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
+#define FS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
+#define FS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
+#define FS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
+#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	*/
+
 /* the read-only stuff doesn't really belong here, but any other place is
    probably as bad and I don't want to create yet another include file. */
 
@@ -210,6 +241,8 @@ struct inodes_stat_t {
 #define FS_IOC32_SETFLAGS		_IOW('f', 2, int)
 #define FS_IOC32_GETVERSION		_IOR('v', 1, int)
 #define FS_IOC32_SETVERSION		_IOW('v', 2, int)
+#define FS_IOC_FSGETXATTR		_IOR ('X', 31, struct fsxattr)
+#define FS_IOC_FSSETXATTR		_IOW ('X', 32, struct fsxattr)
 
 /*
  * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)