From: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Date: Thu, 5 Jun 2014 02:02:51 +0000 (+0800)
Subject: btrfs: replace EINVAL with EOPNOTSUPP for dev_replace raid56
X-Git-Tag: firefly_0821_release~176^2~3585^2~52
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c81d57679ee4b87a5b50e9afe4e5d1866d08b9ad;p=firefly-linux-kernel-4.4.55.git

btrfs: replace EINVAL with EOPNOTSUPP for dev_replace raid56

To return EOPNOTSUPP is more user friendly than to return EINVAL,
and then user-space tool will show that the dev_replace operation
for raid56 is not currently supported rather than showing that
there is an invalid argument.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 9f2290509aca..2af6e66fe788 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -313,7 +313,7 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
 
 	if (btrfs_fs_incompat(fs_info, RAID56)) {
 		btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6");
-		return -EINVAL;
+		return -EOPNOTSUPP;
 	}
 
 	switch (args->start.cont_reading_from_srcdev_mode) {