On 08/05/2019 01:23 AM, Naohiro Aota wrote:
> targetcli-fb (or its library: rtslib-fb) allows us to create LUN up to
> 65535. On the other hand, the kernel driver is limiting max_lun to 0.
>
> This limitation causes an actual problem when you delete a loopback device
> (using /sys/class/scsi_device/${lun}/device/delete) and rescan it (using
> /sys/class/scsi_host/host${h}/scan). You can delete the device, but cannot
> rescan it because its LUN is larger than the max_lun and so the scan
> request results in -EINVAL error in scsi_scan_host_selected().
How are you kicking off this rescan?
Just to make sure I understood you, does the initial LU have LUN 0, you
delete that, then are you creating another LU with a LUN value that is
not 0?
Is it rtslib that is giving the new LU a LUN that is not 0?
>
> This commit fix the upper limit to be as same as rtslib-fb allows.
>
> Signed-off-by: Naohiro Aota <[email protected]>
> ---
> drivers/target/loopback/tcm_loop.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/target/loopback/tcm_loop.c
> b/drivers/target/loopback/tcm_loop.c
> index 3305b47fdf53..3db541ad727d 100644
> --- a/drivers/target/loopback/tcm_loop.c
> +++ b/drivers/target/loopback/tcm_loop.c
> @@ -336,10 +336,10 @@ static int tcm_loop_driver_probe(struct device *dev)
> */
> *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
> /*
> - * Setup single ID, Channel and LUN for now..
> + * Setup single ID, and Channel for now..
> */
> sh->max_id = 2;
> - sh->max_lun = 0;
> + sh->max_lun = 65536;
> sh->max_channel = 0;
> sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
>
>
