btrfs-progs: introduce test_issubvolname() for simplicity

There are many duplicated codes to check if the given string is
correct subvolume name. Introduce test_issubvolname() for this
purpose for simplicity.

Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: David Sterba <dsterba@suse.cz>
Cc: Mike Fleetwood <mike.fleetwood@googlemail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/utils.h b/utils.h
index d7d2ad5d..e3d80c10 100644
--- a/utils.h
+++ b/utils.h
@@ -116,6 +116,7 @@ int get_device_info(int fd, u64 devid,
 int test_uuid_unique(char *fs_uuid);
 
 int test_minimum_size(const char *file, u32 leafsize);
+int test_issubvolname(const char *name);
 
 /*
  * Btrfs minimum size calculation is complicated, it should include at least: