Btrfs-progs: Complete the help information of btrfs send/receive

When typing command "btrfs send --help" or "btrfs receive --help",
the help information of the commands is incomplete, which only
shows a short usage.

This patch helps to display the complete infomation of the commands.

Signed-off-by: Cheng Yang <chenyang.fnst@cn.fujitsu.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/commands.h b/commands.h
index 61d74d77..64988e78 100644
--- a/commands.h
+++ b/commands.h
@@ -91,6 +91,9 @@ extern const struct cmd_group quota_cmd_group;
 extern const struct cmd_group qgroup_cmd_group;
 extern const struct cmd_group replace_cmd_group;
 
+extern const char * const cmd_send_usage[];
+extern const char * const cmd_receive_usage[];
+
 int cmd_subvolume(int argc, char **argv);
 int cmd_filesystem(int argc, char **argv);
 int cmd_balance(int argc, char **argv);