From: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Date: Thu, 5 Jun 2014 02:02:52 +0000 (+0800)
Subject: btrfs-progs: show meaningful msgs for replace cmd upon raid56
X-Git-Tag: upstream/4.16.1~2797
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4da2751451ffa2757f11b8433fdf02c949c5e21e;p=platform%2Fupstream%2Fbtrfs-progs.git

btrfs-progs: show meaningful msgs for replace cmd upon raid56

This depends on the kernel patch:
	[PATCH] btrfs:replace EINVAL with EOPNOTSUPP for dev_replace

This catches the EOPNOTSUPP and output msg that says dev_replace raid56
is not currently supported. Note that the msg will only be shown when
run dev_replace not in background.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
---

diff --git a/cmds-replace.c b/cmds-replace.c
index 186a127..9fe7ad8 100644
--- a/cmds-replace.c
+++ b/cmds-replace.c
@@ -308,6 +308,11 @@ static int cmd_start_replace(int argc, char **argv)
 				"ERROR: ioctl(DEV_REPLACE_START) failed on \"%s\": %s, %s\n",
 				path, strerror(errno),
 				replace_dev_result2string(start_args.result));
+
+			if (errno == EOPNOTSUPP)
+				fprintf(stderr,
+					"WARNING: dev_replace does not yet handle RAID5/6\n");
+
 			goto leave_with_error;
 		}