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