diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2016-03-10 14:01:31 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-03-30 12:16:02 +0200 |
| commit | 2b556518c3424caa4f40ee4f6199e8877488f5e8 (patch) | |
| tree | 9684bbd86bc2f6e70a9018d6d7f3cbef76c4e25f /block/nbd-client.h | |
| parent | 9f0eb9e129398d8907ec990b18c03f20ee0de15e (diff) | |
| download | qemu-2b556518c3424caa4f40ee4f6199e8877488f5e8.tar.gz | |
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>
Diffstat (limited to 'block/nbd-client.h')
| -rw-r--r-- | block/nbd-client.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/nbd-client.h b/block/nbd-client.h index 53f116d017..bc7aec0795 100644 --- a/block/nbd-client.h +++ b/block/nbd-client.h @@ -48,7 +48,7 @@ int nbd_client_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); int nbd_client_co_flush(BlockDriverState *bs); int nbd_client_co_writev(BlockDriverState *bs, int64_t sector_num, - int nb_sectors, QEMUIOVector *qiov); + int nb_sectors, QEMUIOVector *qiov, int *flags); int nbd_client_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); |