[RFC PATCH 6/6] xfs: add support for setting btime

@@ -884,9 +884,9 @@ typedef struct xfs_dinode {
 	__be64		di_flags2;	/* more random flags */
 	__be32		di_cowextsize;	/* basic cow extent size for file */
 	__u8		di_pad2[12];	/* more padding for future expansion */
+	xfs_timestamp_t	di_crtime;	/* time created */
 
 	/* fields only written to during inode creation */
-	xfs_timestamp_t	di_crtime;	/* time created */
 	__be64		di_ino;		/* inode number */
 	uuid_t		di_uuid;	/* UUID of the filesystem */
 

@@ -415,9 +415,9 @@ struct xfs_log_dinode {
 	uint64_t	di_flags2;	/* more random flags */
 	uint32_t	di_cowextsize;	/* basic cow extent size for file */
 	uint8_t		di_pad2[12];	/* more padding for future expansion */
+	xfs_ictimestamp_t di_crtime;	/* time created */
 
 	/* fields only written to during inode creation */
-	xfs_ictimestamp_t di_crtime;	/* time created */
 	xfs_ino_t	di_ino;		/* inode number */
 	uuid_t		di_uuid;	/* UUID of the filesystem */
 

@@ -582,6 +582,10 @@ xfs_setattr_time(
 		inode->i_ctime = iattr->ia_ctime;
 	if (iattr->ia_valid & ATTR_MTIME)
 		inode->i_mtime = iattr->ia_mtime;
+	if (iattr->ia_valid & ATTR_BTIME) {
+		ip->i_d.di_crtime.t_sec = iattr->ia_btime.tv_sec;
+		ip->i_d.di_crtime.t_nsec = iattr->ia_btime.tv_nsec;
+	}
 }
 
 static int

@@ -1025,11 +1029,14 @@ xfs_vn_setattr(
 	struct dentry		*dentry,
 	struct iattr		*iattr)
 {
+	struct inode		*inode = d_inode(dentry);
+	struct xfs_inode	*ip = XFS_I(inode);
 	int			error;
 
+	if ((iattr->ia_valid & ATTR_BTIME) && ip->i_d.di_version != 3)
+		return -EOPNOTSUPP;
+
 	if (iattr->ia_valid & ATTR_SIZE) {
-		struct inode		*inode = d_inode(dentry);
-		struct xfs_inode	*ip = XFS_I(inode);
 		uint			iolock;
 
 		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);

@@ -1860,7 +1860,7 @@ static struct file_system_type xfs_fs_type = {
 	.name			= "xfs",
 	.mount			= xfs_fs_mount,
 	.kill_sb		= kill_block_super,
-	.fs_flags		= FS_REQUIRES_DEV,
+	.fs_flags		= FS_REQUIRES_DEV | FS_HAS_BTIME,
 };
 MODULE_ALIAS_FS("xfs");