| /* |
| * QEMU Block driver for NBD |
| * |
| * Copyright (C) 2008 Bull S.A.S. |
| * Author: Laurent Vivier <Laurent.Vivier@bull.net> |
| * |
| * Some parts: |
| * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "qemu-common.h" |
| #include "nbd.h" |
| |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| typedef struct BDRVNBDState { |
| int sock; |
| off_t size; |
| size_t blocksize; |
| } BDRVNBDState; |
| |
| static int nbd_open(BlockDriverState *bs, const char* filename, int flags) |
| { |
| BDRVNBDState *s = bs->opaque; |
| const char *host; |
| const char *unixpath; |
| int sock; |
| off_t size; |
| size_t blocksize; |
| int ret; |
| |
| if ((flags & BDRV_O_CREAT)) |
| return -EINVAL; |
| |
| if (!strstart(filename, "nbd:", &host)) |
| return -EINVAL; |
| |
| if (strstart(host, "unix:", &unixpath)) { |
| |
| if (unixpath[0] != '/') |
| return -EINVAL; |
| |
| sock = unix_socket_outgoing(unixpath); |
| |
| } else { |
| uint16_t port; |
| char *p, *r; |
| char hostname[128]; |
| |
| pstrcpy(hostname, 128, host); |
| |
| p = strchr(hostname, ':'); |
| if (p == NULL) |
| return -EINVAL; |
| |
| *p = '\0'; |
| p++; |
| |
| port = strtol(p, &r, 0); |
| if (r == p) |
| return -EINVAL; |
| sock = tcp_socket_outgoing(hostname, port); |
| } |
| |
| if (sock == -1) |
| return -errno; |
| |
| ret = nbd_receive_negotiate(sock, &size, &blocksize); |
| if (ret == -1) |
| return -errno; |
| |
| s->sock = sock; |
| s->size = size; |
| s->blocksize = blocksize; |
| |
| return 0; |
| } |
| |
| static int nbd_read(BlockDriverState *bs, int64_t sector_num, |
| uint8_t *buf, int nb_sectors) |
| { |
| BDRVNBDState *s = bs->opaque; |
| struct nbd_request request; |
| struct nbd_reply reply; |
| |
| request.type = NBD_CMD_READ; |
| request.handle = (uint64_t)(intptr_t)bs; |
| request.from = sector_num * 512;; |
| request.len = nb_sectors * 512; |
| |
| if (nbd_send_request(s->sock, &request) == -1) |
| return -errno; |
| |
| if (nbd_receive_reply(s->sock, &reply) == -1) |
| return -errno; |
| |
| if (reply.error !=0) |
| return -reply.error; |
| |
| if (reply.handle != request.handle) |
| return -EIO; |
| |
| if (nbd_wr_sync(s->sock, buf, request.len, 1) != request.len) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int nbd_write(BlockDriverState *bs, int64_t sector_num, |
| const uint8_t *buf, int nb_sectors) |
| { |
| BDRVNBDState *s = bs->opaque; |
| struct nbd_request request; |
| struct nbd_reply reply; |
| |
| request.type = NBD_CMD_WRITE; |
| request.handle = (uint64_t)(intptr_t)bs; |
| request.from = sector_num * 512;; |
| request.len = nb_sectors * 512; |
| |
| if (nbd_send_request(s->sock, &request) == -1) |
| return -errno; |
| |
| if (nbd_wr_sync(s->sock, (uint8_t*)buf, request.len, 0) != request.len) |
| return -EIO; |
| |
| if (nbd_receive_reply(s->sock, &reply) == -1) |
| return -errno; |
| |
| if (reply.error !=0) |
| return -reply.error; |
| |
| if (reply.handle != request.handle) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static void nbd_close(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| struct nbd_request request; |
| |
| request.type = NBD_CMD_DISC; |
| request.handle = (uint64_t)(intptr_t)bs; |
| request.from = 0; |
| request.len = 0; |
| nbd_send_request(s->sock, &request); |
| |
| close(s->sock); |
| } |
| |
| static int64_t nbd_getlength(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| return s->size; |
| } |
| |
| BlockDriver bdrv_nbd = { |
| .format_name = "nbd", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_open = nbd_open, |
| .bdrv_read = nbd_read, |
| .bdrv_write = nbd_write, |
| .bdrv_close = nbd_close, |
| .bdrv_getlength = nbd_getlength, |
| .protocol_name = "nbd", |
| }; |