btrfs-progs: btrfs-crc: improve usage message

- If -c is set, filename argument is ignored.
- Describe about -h option

Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/btrfs-crc.c b/btrfs-crc.c
index 9e2a01f..27244d7 100644 (file)
--- a/btrfs-crc.c
+++ b/btrfs-crc.c
@@ -26,10 +26,12 @@ void print_usage(int status)
 {
        printf("usage: btrfs-crc filename\n");
        printf("    print out the btrfs crc for \"filename\"\n");
-       printf("usage: btrfs-crc filename -c crc [-s seed] [-l length]\n");
+       printf("usage: btrfs-crc -c crc [-s seed] [-l length]\n");
        printf("    brute force search for file names with the given crc\n");
        printf("      -s seed    the random seed (default: random)\n");
        printf("      -l length  the length of the file names (default: 10)\n");
+       printf("usage: btrfs-crc -h\n");
+       printf("    print this message\n");
        exit(status);
 }