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authorPaolo Bonzini <pbonzini@redhat.com>2011-10-21 13:17:14 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2011-12-22 11:53:57 +0100
commit1486d04a1b41093e5f97f20ca7397e01df055f49 (patch)
treea429eaba2513cf042b68cf9464f51d1bb8e4d3bd /block
parent2c7989a9b13a45963548cf4d89535fe90d809cac (diff)
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nbd: add support for NBD_CMD_FLUSH
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/nbd.c45
1 files changed, 37 insertions, 8 deletions
diff --git a/block/nbd.c b/block/nbd.c
index 2f483cd..097b418 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -407,6 +407,34 @@ static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num,
return nbd_co_writev_1(bs, sector_num, nb_sectors, qiov, offset);
}
+static int nbd_co_flush(BlockDriverState *bs)
+{
+ BDRVNBDState *s = bs->opaque;
+ struct nbd_request request;
+ struct nbd_reply reply;
+
+ if (!(s->nbdflags & NBD_FLAG_SEND_FLUSH)) {
+ return 0;
+ }
+
+ request.type = NBD_CMD_FLUSH;
+ if (s->nbdflags & NBD_FLAG_SEND_FUA) {
+ request.type |= NBD_CMD_FLAG_FUA;
+ }
+
+ request.from = 0;
+ request.len = 0;
+
+ nbd_coroutine_start(s, &request);
+ if (nbd_co_send_request(s, &request, NULL, 0) == -1) {
+ reply.error = errno;
+ } else {
+ nbd_co_receive_reply(s, &request, &reply, NULL, 0);
+ }
+ nbd_coroutine_end(s, &request);
+ return -reply.error;
+}
+
static void nbd_close(BlockDriverState *bs)
{
BDRVNBDState *s = bs->opaque;
@@ -424,14 +452,15 @@ static int64_t nbd_getlength(BlockDriverState *bs)
}
static BlockDriver bdrv_nbd = {
- .format_name = "nbd",
- .instance_size = sizeof(BDRVNBDState),
- .bdrv_file_open = nbd_open,
- .bdrv_co_readv = nbd_co_readv,
- .bdrv_co_writev = nbd_co_writev,
- .bdrv_close = nbd_close,
- .bdrv_getlength = nbd_getlength,
- .protocol_name = "nbd",
+ .format_name = "nbd",
+ .instance_size = sizeof(BDRVNBDState),
+ .bdrv_file_open = nbd_open,
+ .bdrv_co_readv = nbd_co_readv,
+ .bdrv_co_writev = nbd_co_writev,
+ .bdrv_close = nbd_close,
+ .bdrv_co_flush_to_os = nbd_co_flush,
+ .bdrv_getlength = nbd_getlength,
+ .protocol_name = "nbd",
};
static void bdrv_nbd_init(void)