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btrfs-progs: refine btrfs-debug-tree error prompt when a mount point given 

Now, if exec:
	# btrfs-debug-tree <mount_point>
it echos:
	: Superblock bytenr is larger than device size

But it is quite misleading, because it is a valid btrfs.
In this case, we should tell the developer to provide a block device.

After apply:
	: '<mount_point>' is not a block device

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Reviewed-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Gui Hecheng 2014-12-25 09:16:35 +08:00 committed by David Sterba
parent 280434ebde
commit 1bad43fbe0
1 changed files with 6 additions and 0 deletions
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6
btrfs-debug-tree.c
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@ -179,6 +179,12 @@ int main(int ac, char **av)
if (check_argc_exact(ac, 1))
print_usage();
ret = check_arg_type(av[optind]);
if (ret != BTRFS_ARG_BLKDEV) {
fprintf(stderr, "'%s' is not a block device\n", av[optind]);
exit(1);
}
info = open_ctree_fs_info(av[optind], 0, 0, OPEN_CTREE_PARTIAL);
if (!info) {
fprintf(stderr, "unable to open %s\n", av[optind]);