Re: [PATCH v5 07/10] md/raid1,raid10: skip futile retries on P2PDMA mapping failures

[Logan Gunthorpe]

On 2026-07-23 2:42 p.m., Mykola Marzhan wrote:
> BLK_STS_P2PDMA reflects the peer/member pairing, not member health:
> retrying the same pages on the same member cannot succeed.  Keep
> WriteErrorSeen so the range stays fenced, but skip WantReplacement and
> FailFast eviction, as commit f7b24c7b41f2 ("md/raid1,raid10: don't fail
> devices for invalid IO errors") did for BLK_STS_INVAL.
> 
> The failure is whole-range and deterministic, so narrow_write_error()'s
> block-by-block submit_bio_wait() retries are pointless.  Record the
> whole range as a bad block in the completion handler instead.
> 
> Fixes: 02666132403a ("md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device")
> Assisted-by: Claude:claude-fable-5
> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
> Signed-off-by: Mykola Marzhan <mykola@xxxxxxxxxxx>

Change my no longer correct first Signed-off-by to:

Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>

Logan