On Thu, Jan 11, 2018 at 2:09 PM, Ilya Dryomov <idryo...@gmail.com> wrote:
> Hello,
>
> I was doing some cleanup work on rbd BLKROSET handler and discovered
> that we ignore partition rw/ro setting (hd_struct->policy) for pretty
> much everything but straight writes.
>
> David (CCed) has blktests patches standing by.
>
> (Another aspect of this is that we don't enforce open(2) mode. Tejun
> took a stab at this a few years ago, but his patch had to be reverted:
>
> 75f1dc0d076d ("block: check bdev_read_only() from blkdev_get()")
> e51900f7d38c ("block: revert block_dev read-only check")
>
> It is a separate issue and refusing writes to read-only devices is
> obviously more important, but perhaps it's time to revisit that as
> well?)
>
> v2 -> v3:
> - lookup part only once; combine read-only check with existing
> should_fail_request check
>
> v1 -> v2:
> - added unlikely() per Sagi's suggestion
>
> Thanks,
>
> Ilya
>
>
> Ilya Dryomov (2):
> block: fail op_is_write() requests to read-only partitions
> block: add bdev_read_only() checks to common helpers
>
> block/blk-core.c | 56
> ++++++++++++++++++++++++++++++++++++++------------------
> block/blk-lib.c | 12 ++++++++++++
> 2 files changed, 50 insertions(+), 18 deletions(-)
Jens, could you please pick these up for 4.16?
Thanks,
Ilya
