md/raid1: restrict atomic write limits and handle runtime constraints

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Restrict the RAID1 atomic write limits by setting chunk_sectors to
BARRIER_UNIT_SECTOR_SIZE so that atomic writes never straddle a barrier
unit.

A bio that passes block-layer validation may still become unserviceable
within RAID1 due to bad blocks or write-behind constraints. In the former
case, complete the bio with EIO. In the latter case, disable
write-behind rather than failing the bio with EIO.

Fixes: f2a38abf5f ("md/raid1: Atomic write support")
Fixes: a4c55c9026 ("md/raid1: simplify raid1_write_request() error handling")
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20260710101521.1714-3-abd.masalkhi@gmail.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>

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Abd-Alrhman Masalkhi 2026-07-10 10:15:16 +00:00 • committed by Yu Kuai

parent c7d34d17ea

commit 86d801e895

1 changed files with 9 additions and 13 deletions

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drivers/md/raid1.c

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