[PATCH 1/3] xfs: refactor setflags to use setattr code directly

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Refactor the SETFLAGS implementation to use the SETXATTR code directly
instead of partially constructing a struct fsxattr and calling bits and
pieces of the setxattr code.  This reduces code size with no functional
change.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/xfs_ioctl.c |   48 +++---------------------------------------------
 1 file changed, 3 insertions(+), 45 deletions(-)


diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 552f18554c48..6f55cd7eb34f 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1490,11 +1490,8 @@ xfs_ioc_setxflags(
 	struct file		*filp,
 	void			__user *arg)
 {
-	struct xfs_trans	*tp;
 	struct fsxattr		fa;
-	struct fsxattr		old_fa;
 	unsigned int		flags;
-	int			join_flags = 0;
 	int			error;
 
 	if (copy_from_user(&flags, arg, sizeof(flags)))
@@ -1505,52 +1502,13 @@ xfs_ioc_setxflags(
 		      FS_SYNC_FL))
 		return -EOPNOTSUPP;
 
-	fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
+	xfs_fill_fsxattr(ip, false, &fa);
+	fa.fsx_xflags = xfs_merge_ioc_xflags(flags, fa.fsx_xflags);
 
 	error = mnt_want_write_file(filp);
 	if (error)
 		return error;
-
-	error = xfs_ioctl_setattr_drain_writes(ip, &fa, &join_flags);
-	if (error) {
-		xfs_iunlock(ip, join_flags);
-		goto out_drop_write;
-	}
-
-	/*
-	 * Changing DAX config may require inode locking for mapping
-	 * invalidation. These need to be held all the way to transaction commit
-	 * or cancel time, so need to be passed through to
-	 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
-	 * appropriately.
-	 */
-	error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags);
-	if (error) {
-		xfs_iunlock(ip, join_flags);
-		goto out_drop_write;
-	}
-
-	tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
-	if (IS_ERR(tp)) {
-		error = PTR_ERR(tp);
-		goto out_drop_write;
-	}
-
-	xfs_fill_fsxattr(ip, false, &old_fa);
-	error = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, &fa);
-	if (error) {
-		xfs_trans_cancel(tp);
-		goto out_drop_write;
-	}
-
-	error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
-	if (error) {
-		xfs_trans_cancel(tp);
-		goto out_drop_write;
-	}
-
-	error = xfs_trans_commit(tp);
-out_drop_write:
+	error = xfs_ioctl_setattr(ip, &fa);
 	mnt_drop_write_file(filp);
 	return error;
 }