Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

[Vishal Verma]

On Wed, 2015-06-17 at 19:56 -0400, Dan Williams wrote:
> Upon detection of a read-only backing device arrange for the btt to
> device to be read only.  Implement a catch for the BLKROSET ioctl and
> only allow a btt-instance to become read-write when the backing-device
> becomes read-write.  Conversely, if a backing-device becomes read-only
> arrange for its parent btt to be marked read-only.  Synchronize these
> changes under the bus lock.
> 
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
>  drivers/nvdimm/blk.c      |    4 +++
>  drivers/nvdimm/btt.c      |   34 ++++++++++++++++++++++++++--
>  drivers/nvdimm/btt_devs.c |   42 ++++++++++++++++++++++++++++++++++
>  drivers/nvdimm/bus.c      |   55 +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/nvdimm/nd-core.h  |   14 +++++++++++
>  drivers/nvdimm/nd.h       |    4 +++
>  drivers/nvdimm/pmem.c     |    4 +++
>  7 files changed, 154 insertions(+), 3 deletions(-)

Reviewed-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>


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