diff options
| -rw-r--r-- | nbd/server.c | 128 |
1 files changed, 66 insertions, 62 deletions
diff --git a/nbd/server.c b/nbd/server.c index 297d314..83f21c5 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1587,17 +1587,78 @@ static coroutine_fn int nbd_do_cmd_read(NBDClient *client, NBDRequest *request, } } +/* Handle NBD request. + * Return -errno if sending fails. Other errors are reported directly to the + * client as an error reply. */ +static coroutine_fn int nbd_handle_request(NBDClient *client, + NBDRequest *request, + uint8_t *data, Error **errp) +{ + int ret; + int flags; + NBDExport *exp = client->exp; + char *msg; + + switch (request->type) { + case NBD_CMD_READ: + return nbd_do_cmd_read(client, request, data, errp); + + case NBD_CMD_WRITE: + flags = 0; + if (request->flags & NBD_CMD_FLAG_FUA) { + flags |= BDRV_REQ_FUA; + } + ret = blk_pwrite(exp->blk, request->from + exp->dev_offset, + data, request->len, flags); + return nbd_send_generic_reply(client, request->handle, ret, + "writing to file failed", errp); + + case NBD_CMD_WRITE_ZEROES: + flags = 0; + if (request->flags & NBD_CMD_FLAG_FUA) { + flags |= BDRV_REQ_FUA; + } + if (!(request->flags & NBD_CMD_FLAG_NO_HOLE)) { + flags |= BDRV_REQ_MAY_UNMAP; + } + ret = blk_pwrite_zeroes(exp->blk, request->from + exp->dev_offset, + request->len, flags); + return nbd_send_generic_reply(client, request->handle, ret, + "writing to file failed", errp); + + case NBD_CMD_DISC: + /* unreachable, thanks to special case in nbd_co_receive_request() */ + abort(); + + case NBD_CMD_FLUSH: + ret = blk_co_flush(exp->blk); + return nbd_send_generic_reply(client, request->handle, ret, + "flush failed", errp); + + case NBD_CMD_TRIM: + ret = blk_co_pdiscard(exp->blk, request->from + exp->dev_offset, + request->len); + return nbd_send_generic_reply(client, request->handle, ret, + "discard failed", errp); + + default: + msg = g_strdup_printf("invalid request type (%" PRIu32 ") received", + request->type); + ret = nbd_send_generic_reply(client, request->handle, -EINVAL, msg, + errp); + g_free(msg); + return ret; + } +} + /* Owns a reference to the NBDClient passed as opaque. */ static coroutine_fn void nbd_trip(void *opaque) { NBDClient *client = opaque; - NBDExport *exp = client->exp; NBDRequestData *req; NBDRequest request = { 0 }; /* GCC thinks it can be used uninitialized */ int ret; - int flags; Error *local_err = NULL; - char *msg = NULL; trace_nbd_trip(); if (client->closing) { @@ -1631,66 +1692,9 @@ static coroutine_fn void nbd_trip(void *opaque) ret = nbd_send_generic_reply(client, request.handle, -EINVAL, error_get_pretty(export_err), &local_err); error_free(export_err); - - goto replied; - } - - switch (request.type) { - case NBD_CMD_READ: - ret = nbd_do_cmd_read(client, &request, req->data, &local_err); - break; - - case NBD_CMD_WRITE: - flags = 0; - if (request.flags & NBD_CMD_FLAG_FUA) { - flags |= BDRV_REQ_FUA; - } - ret = blk_pwrite(exp->blk, request.from + exp->dev_offset, - req->data, request.len, flags); - ret = nbd_send_generic_reply(client, request.handle, ret, - "writing to file failed", &local_err); - break; - - case NBD_CMD_WRITE_ZEROES: - flags = 0; - if (request.flags & NBD_CMD_FLAG_FUA) { - flags |= BDRV_REQ_FUA; - } - if (!(request.flags & NBD_CMD_FLAG_NO_HOLE)) { - flags |= BDRV_REQ_MAY_UNMAP; - } - ret = blk_pwrite_zeroes(exp->blk, request.from + exp->dev_offset, - request.len, flags); - ret = nbd_send_generic_reply(client, request.handle, ret, - "writing to file failed", &local_err); - break; - - case NBD_CMD_DISC: - /* unreachable, thanks to special case in nbd_co_receive_request() */ - abort(); - - case NBD_CMD_FLUSH: - ret = blk_co_flush(exp->blk); - ret = nbd_send_generic_reply(client, request.handle, ret, - "flush failed", &local_err); - break; - - case NBD_CMD_TRIM: - ret = blk_co_pdiscard(exp->blk, request.from + exp->dev_offset, - request.len); - ret = nbd_send_generic_reply(client, request.handle, ret, - "discard failed", &local_err); - break; - - default: - msg = g_strdup_printf("invalid request type (%" PRIu32 ") received", - request.type); - ret = nbd_send_generic_reply(client, request.handle, -EINVAL, msg, - &local_err); - g_free(msg); + } else { + ret = nbd_handle_request(client, &request, req->data, &local_err); } - -replied: if (ret < 0) { error_prepend(&local_err, "Failed to send reply: "); goto disconnect; |