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block, drivers: add REQ_OP_FLUSH operation

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This adds a REQ_OP_FLUSH operation that is sent to request_fn
based drivers by the block layer's flush code, instead of
sending requests with the request->cmd_flags REQ_FLUSH bit set.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Mike Christie
2016-06-05 14:32:23 -05:00
committed by Jens Axboe
parent 4e1b2d52a8
commit 3a5e02ced1
20 changed files with 40 additions and 31 deletions
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6
Documentation/block/writeback_cache_control.txt
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@@ -73,9 +73,9 @@ doing:
blk_queue_write_cache(sdkp->disk->queue, true, false);
and handle empty REQ_FLUSH requests in its prep_fn/request_fn. Note that
and handle empty REQ_OP_FLUSH requests in its prep_fn/request_fn. Note that
REQ_FLUSH requests with a payload are automatically turned into a sequence
of an empty REQ_FLUSH request followed by the actual write by the block
of an empty REQ_OP_FLUSH request followed by the actual write by the block
layer. For devices that also support the FUA bit the block layer needs
to be told to pass through the REQ_FUA bit using:
@@ -83,4 +83,4 @@ to be told to pass through the REQ_FUA bit using:
and the driver must handle write requests that have the REQ_FUA bit set
in prep_fn/request_fn. If the FUA bit is not natively supported the block
layer turns it into an empty REQ_FLUSH request after the actual write.
layer turns it into an empty REQ_OP_FLUSH request after the actual write.