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block: Allow BDRV_REQ_FUA through blk_pwrite()

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We have several block drivers that understand BDRV_REQ_FUA,
and emulate it in the block layer for the rest by a full flush.
But without a way to actually request BDRV_REQ_FUA during a
pass-through blk_pwrite(), FUA-aware block drivers like NBD are
forced to repeat the emulation logic of a full flush regardless
of whether the backend they are writing to could do it more
efficiently.

This patch just wires up a flags argument; followup patches
will actually make use of it in the NBD driver and in qemu-io.

Signed-off-by: Eric Blake <eblake@redhat.com>
Acked-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2016-05-06 10:26:27 -06:00 • committed by Kevin Wolf
parent 0e01b76e7c
commit 8341f00dc2
15 changed files with 37 additions and 33 deletions
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2
qemu-io-cmds.c
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@ -474,7 +474,7 @@ static int do_pwrite(BlockBackend *blk, char *buf, int64_t offset,
return -ERANGE;
}
*total = blk_pwrite(blk, offset, (uint8_t *)buf, count);
*total = blk_pwrite(blk, offset, (uint8_t *)buf, count, 0);
if (*total < 0) {
return *total;
}