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nbd/server: refactor nbd_trip 

- do not use 'goto error_reply' outside a switch to jump into the
  middle of the switch's default case label
- reduce code duplication

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170602150150.258222-13-vsementsov@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-06-02 18:01:50 +03:00 committed by Paolo Bonzini
parent 2e5c9ad6f4
commit 8c372a02e0
1 changed files with 20 additions and 33 deletions
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53
nbd/server.c
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@ -1078,6 +1078,7 @@ static coroutine_fn void nbd_trip(void *opaque)
NBDReply reply;
int ret;
int flags;
int reply_data_len = 0;
TRACE("Reading request.");
if (client->closing) {
@ -1090,7 +1091,7 @@ static coroutine_fn void nbd_trip(void *opaque)
client->recv_coroutine = NULL;
nbd_client_receive_next_request(client);
if (ret == -EIO) {
goto out;
goto disconnect;
}
reply.handle = request.handle;
@ -1098,7 +1099,7 @@ static coroutine_fn void nbd_trip(void *opaque)
if (ret < 0) {
reply.error = -ret;
goto error_reply;
goto reply;
}
if (client->closing) {
@ -1119,7 +1120,7 @@ static coroutine_fn void nbd_trip(void *opaque)
if (ret < 0) {
LOG("flush failed");
reply.error = -ret;
goto error_reply;
break;
}
}
@ -1128,12 +1129,12 @@ static coroutine_fn void nbd_trip(void *opaque)
if (ret < 0) {
LOG("reading from file failed");
reply.error = -ret;
goto error_reply;
break;
}
reply_data_len = request.len;
TRACE("Read %" PRIu32" byte(s)", request.len);
if (nbd_co_send_reply(req, &reply, request.len) < 0)
goto out;
break;
case NBD_CMD_WRITE:
TRACE("Request type is WRITE");
@ -1141,7 +1142,7 @@ static coroutine_fn void nbd_trip(void *opaque)
if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
TRACE("Server is read-only, return error");
reply.error = EROFS;
goto error_reply;
break;
}
TRACE("Writing to device");
@ -1155,21 +1156,16 @@ static coroutine_fn void nbd_trip(void *opaque)
if (ret < 0) {
LOG("writing to file failed");
reply.error = -ret;
goto error_reply;
}
if (nbd_co_send_reply(req, &reply, 0) < 0) {
goto out;
}
break;
case NBD_CMD_WRITE_ZEROES:
TRACE("Request type is WRITE_ZEROES");
if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
TRACE("Server is read-only, return error");
reply.error = EROFS;
goto error_reply;
break;
}
TRACE("Writing to device");
@ -1186,14 +1182,9 @@ static coroutine_fn void nbd_trip(void *opaque)
if (ret < 0) {
LOG("writing to file failed");
reply.error = -ret;
goto error_reply;
}
if (nbd_co_send_reply(req, &reply, 0) < 0) {
goto out;
}
break;
case NBD_CMD_DISC:
/* unreachable, thanks to special case in nbd_co_receive_request() */
abort();
@ -1206,9 +1197,7 @@ static coroutine_fn void nbd_trip(void *opaque)
LOG("flush failed");
reply.error = -ret;
}
if (nbd_co_send_reply(req, &reply, 0) < 0) {
goto out;
}
break;
case NBD_CMD_TRIM:
TRACE("Request type is TRIM");
@ -1218,21 +1207,19 @@ static coroutine_fn void nbd_trip(void *opaque)
LOG("discard failed");
reply.error = -ret;
}
if (nbd_co_send_reply(req, &reply, 0) < 0) {
goto out;
}
break;
default:
LOG("invalid request type (%" PRIu32 ") received", request.type);
reply.error = EINVAL;
error_reply:
/* We must disconnect after NBD_CMD_WRITE if we did not
* read the payload.
*/
if (nbd_co_send_reply(req, &reply, 0) < 0 || !req->complete) {
goto out;
}
break;
}
reply:
/* We must disconnect after NBD_CMD_WRITE if we did not
* read the payload.
*/
if (nbd_co_send_reply(req, &reply, reply_data_len) < 0 || !req->complete) {
goto disconnect;
}
TRACE("Request/Reply complete");
@ -1242,7 +1229,7 @@ done:
nbd_client_put(client);
return;
out:
disconnect:
nbd_request_put(req);
client_close(client, true);
nbd_client_put(client);