Re: [PATCH -next v3] target/rd: Don't pass imcomplete scatterlist entries to sbc_dif_verify_*

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On Sat, 2015-04-11 at 13:17 +0900, Akinobu Mita wrote:
> The scatterlist for protection information which is passed to
> sbc_dif_verify_read() or sbc_dif_verify_write() requires that
> neighboring scatterlist entries are contiguous or chained so that they
> can be iterated by sg_next().
> 
> However, the protection information for RD-MCP backends could be located
> in the multiple scatterlist arrays when the ramdisk space is too large.
> So if the read/write request straddles this boundary, sbc_dif_verify_read()
> or sbc_dif_verify_write() can't iterate all scatterlist entries.
> 
> This problem can be fixed by chaining protection information scatterlist
> at creation time.  For the architectures which don't support sg chaining
> (i.e. !CONFIG_ARCH_HAS_SG_CHAIN), fix it by allocating temporary
> scatterlist if needed.
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
> Cc: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> Cc: Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx>
> Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
> Cc: target-devel@xxxxxxxxxxxxxxx
> Cc: linux-scsi@xxxxxxxxxxxxxxx
> ---
> * v3
> - Fix it by chaining protection information scatterlist at creation time
>   if CONFIG_ARCH_HAS_SG_CHAIN is defined.
> 
>  drivers/target/target_core_rd.c | 67 +++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 64 insertions(+), 3 deletions(-)

Applied to target-pending/for-next.

Thanks for updating to use CONFIG_ARCH_HAS_SG_CHAIN for the common
case.  :)

--nab

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