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nbd: add support for NBD_CMD_FLUSH

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-10-21 13:17:14 +02:00
parent 2c7989a9b1
commit 1486d04a1b
2 changed files with 51 additions and 9 deletions
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15
nbd.c
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@ -203,7 +203,8 @@ int nbd_negotiate(int csock, off_t size, uint32_t flags)
cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL);
cpu_to_be64w((uint64_t*)(buf + 16), size);
cpu_to_be32w((uint32_t*)(buf + 24),
flags | NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_FUA);
flags | NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_FLUSH |
NBD_FLAG_SEND_FUA);
memset(buf + 28, 0, 124);
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
@ -710,6 +711,18 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
TRACE("Request type is DISCONNECT");
errno = 0;
return 1;
case NBD_CMD_FLUSH:
TRACE("Request type is FLUSH");
ret = bdrv_flush(bs);
if (ret < 0) {
LOG("flush failed");
reply.error = -ret;
}
if (nbd_send_reply(csock, &reply) == -1)
return -1;
break;
default:
LOG("invalid request type (%u) received", request.type);
errno = EINVAL;