On 5/20/21 6:22 AM, Damien Le Moal wrote:
A target map method requesting the requeue of a bio with
DM_MAPIO_REQUEUE or completing it with DM_ENDIO_REQUEUE can cause
unaligned write errors if the bio is a write operation targeting a
sequential zone. If a zoned target request such a requeue, warn about
it and kill the IO.
The function dm_is_zone_write() is introduced to detect write operations
to zoned targets.
This change does not affect the target drivers supporting zoned devices
and exposing a zoned device, namely dm-crypt, dm-linear and dm-flakey as
none of these targets ever request a requeue.
Signed-off-by: Damien Le Moal <[email protected]>
---
drivers/md/dm-zone.c | 17 +++++++++++++++++
drivers/md/dm.c | 18 +++++++++++++++---
drivers/md/dm.h | 5 +++++
3 files changed, 37 insertions(+), 3 deletions(-)
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
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