On Thu, Jul 27, 2017 at 9:24 PM, Hans van Kranenburg
<hans.van.kranenburg@xxxxxxxxxx> wrote:
> Device ID numbers always start at 1, not at 0. The first IOC_DEV_INFO
> call does not make sense, since it will always return ENODEV.
When there is a btrfs-replace ongoing, there is a Device ID 0
> ioctl(3, BTRFS_IOC_DEV_INFO, {devid=0}) = -1 ENODEV (No such device)
>
> Signed-off-by: Hans van Kranenburg <hans.van.kranenburg@xxxxxxxxxx>
> ---
> cmds-fi-usage.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/cmds-fi-usage.c b/cmds-fi-usage.c
> index 101a0c4..52c4c62 100644
> --- a/cmds-fi-usage.c
> +++ b/cmds-fi-usage.c
> @@ -535,7 +535,7 @@ static int load_device_info(int fd, struct device_info **device_info_ptr,
> return 1;
> }
>
> - for (i = 0, ndevs = 0 ; i <= fi_args.max_id ; i++) {
> + for (i = 1, ndevs = 0 ; i <= fi_args.max_id ; i++) {
> if (ndevs >= fi_args.num_devices) {
> error("unexpected number of devices: %d >= %llu", ndevs,
> (unsigned long long)fi_args.num_devices);
> --
> 2.11.0
>
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