On Sun, 2009-01-18 at 14:40 +0100, Peter Klotz wrote: > Calling btrfsctl results in this message when module btrfs.ko is not loaded: > > r...@asus:/root# btrfsctl -A /dev/sda > ioctl:: Bad file descriptor .. > The output with applied patch: > > r...@asus:/root# btrfsctl -A /dev/sda > failed to open /dev/btrfs-control
It would probably be better to use perror() instead of fprintf, in order to give the actual error message. I often find it useful to know why the device failed to open - is it missing, permission issues? I've updated the patch: diff --git a/btrfsctl.c b/btrfsctl.c index e049799..df1a165 100644 --- a/btrfsctl.c +++ b/btrfsctl.c @@ -189,6 +189,10 @@ int main(int ac, char **av) if (command == BTRFS_IOC_SCAN_DEV) { fd = open("/dev/btrfs-control", O_RDWR); + if (fd < 0) { + perror("failed to open /dev/btrfs-control"); + exit(1); + } name = fname; } else { fd = open_file_or_dir(fname); -- Calvin Walton <calvin.wal...@gmail.com> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html