Re: [PATCH v2 5/7] md/raid1,raid10: keep REQ_NOMERGE on narrow_write_error() retry clones

[Logan Gunthorpe]

On 2026-07-19 04:53, Mykola Marzhan wrote:
> narrow_write_error() re-issues a failed write in badblock-granularity
> chunks, cloning from the master bio and resetting bi_opf to a bare
> REQ_OP_WRITE. For a P2PDMA bio that reset drops REQ_NOMERGE, which is
> the only request-level protection against the member queue merging
> P2PDMA segments across pgmaps or with host memory (see the preceding
> md_submit_bio() fix): the retry path would quietly reopen the hole
> the submission path closes. Restore the flag on P2PDMA retry clones.
> 
> Fixes: 02666132403a ("md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device")
> Assisted-by: Claude:claude-opus-4-8
> Signed-off-by: Mykola Marzhan <mykola@xxxxxxxxxxx>
Looks correct, thanks.

Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>