[Drbd-dev] [PATCH] drbd: correctly submit flush bio on barrier
axboe at kernel.dk
Wed May 3 17:39:48 CEST 2023
On Wed, 03 May 2023 14:19:37 +0200, Christoph Böhmwalder wrote:
> When we receive a flush command (or "barrier" in DRBD), we currently use
> a REQ_OP_FLUSH with the REQ_PREFLUSH flag set.
> The correct way to submit a flush bio is by using a REQ_OP_WRITE without
> any data, and set the REQ_PREFLUSH flag.
> Since commit b4a6bb3a67aa ("block: add a sanity check for non-write
> flush/fua bios"), this triggers a warning in the block layer, but this
> has been broken for quite some time before that.
[1/1] drbd: correctly submit flush bio on barrier
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