qemu-e2k/nbd
Eric Blake 8341f00dc2 block: Allow BDRV_REQ_FUA through blk_pwrite()
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>
2016-05-12 15:22:08 +02:00
..
Makefile.objs nbd: Split nbd.c 2016-01-15 18:58:02 +01:00
client.c nbd: Don't fail handshake on NBD_OPT_LIST descriptions 2016-04-15 17:56:56 +02:00
common.c nbd: do not hang nbd_wr_syncv if outside a coroutine and no available data 2016-04-08 00:07:44 +02:00
nbd-internal.h nbd: Avoid bitrot in TRACE() usage 2016-04-08 00:07:43 +02:00
server.c block: Allow BDRV_REQ_FUA through blk_pwrite() 2016-05-12 15:22:08 +02:00