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btrfs-progs: sb-mod: add syntax to the help text

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Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-10-19 21:04:34 +02:00
parent bd017ce732
commit 35614d8a64
1 changed files with 10 additions and 0 deletions
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btrfs-sb-mod.c
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@ -326,6 +326,16 @@ int main(int argc, char **argv)
memset(spec, 0, sizeof(spec));
if (argc <= 2) {
printf("Usage: %s image [fieldspec...]\n", argv[0]);
printf("Where fileldspec is: member op\n");
printf(" member: name of the superblock member\n");
printf(" op: single character optionally followed by a value\n");
printf(" . read the member value (no value)\n");
printf(" ? read the member value (no value)\n");
printf(" = set member to the exact value (value required)\n");
printf(" + add this value to member (value required)\n");
printf(" - subtract this value from member (value required)\n");
printf(" ^ xor member with this value (value required)\n");
printf(" @ byteswap of the member (no value)\n");
exit(1);
}
fd = open(argv[1], O_RDWR | O_EXCL);