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| author | Eric Blake <eblake@redhat.com> | 2016-05-03 16:39:08 -0600 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-05-12 15:22:09 +0200 |
| commit | 52a46505742cce4b4b7f88d32636f848287e6bfb (patch) | |
| tree | 64c2f21815b3a07ae4bcdbb3ac5a8572094d8635 /block | |
| parent | 465fe887ccdcb62733666f6e91d85e88b7184298 (diff) | |
| download | qemu-52a46505742cce4b4b7f88d32636f848287e6bfb.zip qemu-52a46505742cce4b4b7f88d32636f848287e6bfb.tar.gz qemu-52a46505742cce4b4b7f88d32636f848287e6bfb.tar.bz2 | |
nbd: Simplify client FUA handling
Now that the block layer honors per-bds FUA support, we don't
have to duplicate the fallback flush at the NBD layer. The
static function nbd_co_writev_flags() is no longer needed, and
the driver can just directly use nbd_client_co_writev().
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/nbd-client.c | 8 | ||||
| -rw-r--r-- | block/nbd-client.h | 2 | ||||
| -rw-r--r-- | block/nbd.c | 25 |
3 files changed, 8 insertions, 27 deletions
diff --git a/block/nbd-client.c b/block/nbd-client.c index 5fc96e9..4d13444 100644 --- a/block/nbd-client.c +++ b/block/nbd-client.c @@ -243,15 +243,15 @@ static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num, static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, - int offset, int *flags) + int offset, int flags) { NbdClientSession *client = nbd_get_client_session(bs); struct nbd_request request = { .type = NBD_CMD_WRITE }; struct nbd_reply reply; ssize_t ret; - if ((*flags & BDRV_REQ_FUA) && (client->nbdflags & NBD_FLAG_SEND_FUA)) { - *flags &= ~BDRV_REQ_FUA; + if (flags & BDRV_REQ_FUA) { + assert(client->nbdflags & NBD_FLAG_SEND_FUA); request.type |= NBD_CMD_FLAG_FUA; } @@ -291,7 +291,7 @@ int nbd_client_co_readv(BlockDriverState *bs, int64_t sector_num, } int nbd_client_co_writev(BlockDriverState *bs, int64_t sector_num, - int nb_sectors, QEMUIOVector *qiov, int *flags) + int nb_sectors, QEMUIOVector *qiov, int flags) { int offset = 0; int ret; diff --git a/block/nbd-client.h b/block/nbd-client.h index bc7aec0..c618dad 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 *flags); + int nb_sectors, QEMUIOVector *qiov, int flags); int nbd_client_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); diff --git a/block/nbd.c b/block/nbd.c index a4fba91..6015e8b 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -355,25 +355,6 @@ static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num, return nbd_client_co_readv(bs, sector_num, nb_sectors, qiov); } -static int nbd_co_writev_flags(BlockDriverState *bs, int64_t sector_num, - int nb_sectors, QEMUIOVector *qiov, int flags) -{ - int ret; - - ret = nbd_client_co_writev(bs, sector_num, nb_sectors, qiov, &flags); - if (ret < 0) { - return ret; - } - - /* The flag wasn't sent to the server, so we need to emulate it with an - * explicit flush */ - if (flags & BDRV_REQ_FUA) { - ret = nbd_client_co_flush(bs); - } - - return ret; -} - static int nbd_co_flush(BlockDriverState *bs) { return nbd_client_co_flush(bs); @@ -470,7 +451,7 @@ static BlockDriver bdrv_nbd = { .bdrv_parse_filename = nbd_parse_filename, .bdrv_file_open = nbd_open, .bdrv_co_readv = nbd_co_readv, - .bdrv_co_writev_flags = nbd_co_writev_flags, + .bdrv_co_writev_flags = nbd_client_co_writev, .bdrv_close = nbd_close, .bdrv_co_flush_to_os = nbd_co_flush, .bdrv_co_discard = nbd_co_discard, @@ -488,7 +469,7 @@ static BlockDriver bdrv_nbd_tcp = { .bdrv_parse_filename = nbd_parse_filename, .bdrv_file_open = nbd_open, .bdrv_co_readv = nbd_co_readv, - .bdrv_co_writev_flags = nbd_co_writev_flags, + .bdrv_co_writev_flags = nbd_client_co_writev, .bdrv_close = nbd_close, .bdrv_co_flush_to_os = nbd_co_flush, .bdrv_co_discard = nbd_co_discard, @@ -506,7 +487,7 @@ static BlockDriver bdrv_nbd_unix = { .bdrv_parse_filename = nbd_parse_filename, .bdrv_file_open = nbd_open, .bdrv_co_readv = nbd_co_readv, - .bdrv_co_writev_flags = nbd_co_writev_flags, + .bdrv_co_writev_flags = nbd_client_co_writev, .bdrv_close = nbd_close, .bdrv_co_flush_to_os = nbd_co_flush, .bdrv_co_discard = nbd_co_discard, |