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block: add a sanity check for non-write flush/fua bios
Check that the PREFUSH and FUA flags are only set on write bios,
given that the flush state machine expects that.
[Damien] The check is also extended to REQ_OP_ZONE_APPEND operations as
these are data write operations used by btrfs and zonefs and may also
have the REQ_FUA bit set.
Reported-by: Damien Le Moal <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Reviewed-by: Niklas Cassel <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
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