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Kevin Wolf 2b556518c3 nbd: Support BDRV_REQ_FUA 
The NBD server already used to send a FUA flag when the writethrough
mode was set. This code was a remnant from the times where protocol
drivers actually had to implement writethrough modes. Since nowadays the
block layer sends flushes in writethrough mode and non-root nodes are
always writeback, this was mostly dead code - only mostly because if NBD
was configured to be used without a format, we sent _both_ FUA and an
explicit flush afterwards, which makes the code not technically dead,
but useless overhead.

This patch changes the code so that the block layer's FUA flag is
recognised and translated into a NBD FUA flag. The additional flush is
avoided now.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
2016-03-30 12:16:02 +02:00
..
accounting.c block: Clean up includes 2016-01-20 13:36:23 +01:00
archipelago.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
backup.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
blkdebug.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
blkreplay.c replay: introduce block devices record/replay 2016-03-30 12:15:57 +02:00
blkverify.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
block-backend.c block: Move enable_write_cache to BB level 2016-03-30 12:16:02 +02:00
bochs.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
cloop.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
commit.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
crypto.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
curl.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
dirty-bitmap.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
dmg.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
gluster.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
io.c block: Introduce bdrv_co_writev_flags() 2016-03-30 12:16:02 +02:00
iscsi.c iscsi: Support BDRV_REQ_FUA 2016-03-30 12:16:02 +02:00
linux-aio.c block: Clean up includes 2016-01-20 13:36:23 +01:00
Makefile.objs replay: introduce block devices record/replay 2016-03-30 12:15:57 +02:00
mirror.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
nbd-client.c nbd: Support BDRV_REQ_FUA 2016-03-30 12:16:02 +02:00
nbd-client.h nbd: Support BDRV_REQ_FUA 2016-03-30 12:16:02 +02:00
nbd.c nbd: Support BDRV_REQ_FUA 2016-03-30 12:16:02 +02:00
nfs.c block/nfs: add support for setting debug level 2016-02-29 14:54:30 -05:00
null.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
parallels.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
qapi.c block/qapi: Use blk_enable_write_cache() 2016-03-30 12:16:02 +02:00
qcow.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
qcow2-cache.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qcow2-cluster.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
qcow2-refcount.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
qcow2-snapshot.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
qcow2.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
qcow2.h qcow2: Add function for refcount order amendment 2015-12-18 14:34:43 +01:00
qed-check.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-cluster.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-gencb.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-l2-cache.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-table.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
qed.h util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
quorum.c quorum: Emit QUORUM_REPORT_BAD for reads in fifo mode 2016-03-17 16:43:30 +01:00
raw-aio.h include/qemu/iov.h: Don't include qemu-common.h 2016-03-22 22:20:16 +01:00
raw-posix.c block/raw-posix.c: Make physical devices usable in QEMU under Mac OS X host 2016-03-30 11:59:32 +02:00
raw-win32.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
raw_bsd.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
rbd.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
sheepdog.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
snapshot.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
ssh.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
stream.c -----BEGIN PGP SIGNATURE----- 2016-03-29 19:54:49 +01:00
throttle-groups.c block: Clean up includes 2016-01-20 13:36:23 +01:00
vdi.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
vhdx-endian.c block: Clean up includes 2016-01-20 13:36:23 +01:00
vhdx-log.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
vhdx.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
vpc.c block: Always set writeback mode in blk_new_open() 2016-03-30 12:16:01 +02:00
vvfat.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
win32-aio.c block: Clean up includes 2016-01-20 13:36:23 +01:00
write-threshold.c block: Clean up includes 2016-01-20 13:36:23 +01:00