[PATCH] reiserfs: fix blkdev_issue_flush() failure handling

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

blkdev_issue_flush() may fail (i.e. due to media error on FLUSH CACHE
command execution) so its users should check for the return value.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
 fs/reiserfs/file.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Index: b/fs/reiserfs/file.c
===================================================================
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -140,14 +140,18 @@ static int reiserfs_sync_file(struct fil
 	struct inode *p_s_inode = p_s_dentry->d_inode;
 	int n_err;
 	int barrier_done;
+	int tmp_ret;
 
 	BUG_ON(!S_ISREG(p_s_inode->i_mode));
 	n_err = sync_mapping_buffers(p_s_inode->i_mapping);
 	reiserfs_write_lock(p_s_inode->i_sb);
 	barrier_done = reiserfs_commit_for_inode(p_s_inode);
 	reiserfs_write_unlock(p_s_inode->i_sb);
-	if (barrier_done != 1 && reiserfs_barrier_flush(p_s_inode->i_sb))
-		blkdev_issue_flush(p_s_inode->i_sb->s_bdev, NULL);
+	if (barrier_done != 1 && reiserfs_barrier_flush(p_s_inode->i_sb)) {
+		tmp_ret = blkdev_issue_flush(p_s_inode->i_sb->s_bdev, NULL);
+		if (n_err == 0 && tmp_ret < 0 && tmp_ret != -EOPNOTSUPP)
+			n_err = tmp_ret;
+	}
 	if (barrier_done < 0)
 		return barrier_done;
 	return (n_err < 0) ? -EIO : 0;