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

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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>
This commit is contained in:
Gui Hecheng 2014-06-05 10:02:52 +08:00 committed by David Sterba
parent 2da5099c69
commit 4da2751451
1 changed files with 5 additions and 0 deletions
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cmds-replace.c
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@ -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;
}