Re: [PATCH 0/3] Fix return code for ioctl( BLKRRPART ) if device is down

[Paolo Bonzini <pbonzini@redhat.com>]

On 24/03/2015 11:16, Fam Zheng wrote:
> If issued right after link down, "blockdev --rereadpt" will be stuck for a
> while and then return normally. Although the underlying capacity and partition
> table are not correctly updated. And it means that userspace can't detect the
> error at all.
> 
> Fix this by propargating the error of "read capacity" command through the
> stack, so that the ioctl could fail with -EIO.
> 
> Fam Zheng (3):
>   block: Return error in rescan_partitions if revalidating disk failed
>   sd: Return error in sd_revalidate_disk if read capacity failed
>   sd: Return -EIO if read capacity failed
> 
>  block/partition-generic.c |  6 +++---
>  drivers/scsi/sd.c         | 22 +++++++++++++---------
>  2 files changed, 16 insertions(+), 12 deletions(-)
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

Though patch 3 could be seen as a change in userspace ABI, so I'm less
sure about it.

Paolo