[qemu.git] / block-nbd.c

/*
 * 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 = {
    "nbd",
    sizeof(BDRVNBDState),
    NULL, /* no probe for protocols */
    nbd_open,
    nbd_read,
    nbd_write,
    nbd_close,
    .bdrv_getlength = nbd_getlength,
    .protocol_name = "nbd",
};
Commit	Line	Data
75818250 TS	1	/*
	2	* QEMU Block driver for NBD
	3	*
	4	* Copyright (C) 2008 Bull S.A.S.
bd5921b4	5	* Author: Laurent Vivier <Laurent.Vivier@bull.net>
75818250 TS	6	*
	7	* Some parts:
	8	* Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws>
	9	*
	10	* Permission is hereby granted, free of charge, to any person obtaining a copy
	11	* of this software and associated documentation files (the "Software"), to deal
	12	* in the Software without restriction, including without limitation the rights
	13	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	14	* copies of the Software, and to permit persons to whom the Software is
	15	* furnished to do so, subject to the following conditions:
	16	*
	17	* The above copyright notice and this permission notice shall be included in
	18	* all copies or substantial portions of the Software.
	19	*
	20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	23	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	24	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	25	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	26	* THE SOFTWARE.
	27	*/
	28
	29	#include "qemu-common.h"
	30	#include "nbd.h"
	31
	32	#include <sys/types.h>
	33	#include <unistd.h>
75818250 TS	34
	35	typedef struct BDRVNBDState {
	36	int sock;
	37	off_t size;
	38	size_t blocksize;
	39	} BDRVNBDState;
	40
	41	static int nbd_open(BlockDriverState bs, const char filename, int flags)
	42	{
	43	BDRVNBDState *s = bs->opaque;
	44	const char *host;
	45	const char *unixpath;
	46	int sock;
	47	off_t size;
	48	size_t blocksize;
	49	int ret;
	50
	51	if ((flags & BDRV_O_CREAT))
	52	return -EINVAL;
	53
	54	if (!strstart(filename, "nbd:", &host))
	55	return -EINVAL;
	56
	57	if (strstart(host, "unix:", &unixpath)) {
	58
	59	if (unixpath[0] != '/')
	60	return -EINVAL;
	61
	62	sock = unix_socket_outgoing(unixpath);
	63
	64	} else {
	65	uint16_t port;
	66	char p, r;
	67	char hostname[128];
	68
	69	pstrcpy(hostname, 128, host);
	70
	71	p = strchr(hostname, ':');
	72	if (p == NULL)
	73	return -EINVAL;
	74
	75	*p = '\0';
	76	p++;
	77
	78	port = strtol(p, &r, 0);
	79	if (r == p)
	80	return -EINVAL;
	81	sock = tcp_socket_outgoing(hostname, port);
	82	}
	83
	84	if (sock == -1)
	85	return -errno;
	86
	87	ret = nbd_receive_negotiate(sock, &size, &blocksize);
	88	if (ret == -1)
	89	return -errno;
	90
	91	s->sock = sock;
	92	s->size = size;
	93	s->blocksize = blocksize;
	94
	95	return 0;
	96	}
	97
98	static int nbd_read(BlockDriverState *bs, int64_t sector_num,
99	uint8_t *buf, int nb_sectors)
100	{
101	BDRVNBDState *s = bs->opaque;
102	struct nbd_request request;
103	struct nbd_reply reply;
104
105	request.type = NBD_CMD_READ;
106	request.handle = (uint64_t)(intptr_t)bs;
107	request.from = sector_num * 512;;
108	request.len = nb_sectors * 512;
109
110	if (nbd_send_request(s->sock, &request) == -1)
111	return -errno;
112
113	if (nbd_receive_reply(s->sock, &reply) == -1)
114	return -errno;
115
116	if (reply.error !=0)
117	return -reply.error;
118
119	if (reply.handle != request.handle)
120	return -EIO;
121
122	if (nbd_wr_sync(s->sock, buf, request.len, 1) != request.len)
123	return -EIO;
124
125	return 0;
126	}
127
128	static int nbd_write(BlockDriverState *bs, int64_t sector_num,
129	const uint8_t *buf, int nb_sectors)
130	{
131	BDRVNBDState *s = bs->opaque;
132	struct nbd_request request;
133	struct nbd_reply reply;
134
135	request.type = NBD_CMD_WRITE;
136	request.handle = (uint64_t)(intptr_t)bs;
137	request.from = sector_num * 512;;
138	request.len = nb_sectors * 512;
139
140	if (nbd_send_request(s->sock, &request) == -1)
141	return -errno;
142
143	if (nbd_wr_sync(s->sock, (uint8_t*)buf, request.len, 0) != request.len)
144	return -EIO;
145
146	if (nbd_receive_reply(s->sock, &reply) == -1)
147	return -errno;
148
149	if (reply.error !=0)
150	return -reply.error;
151
152	if (reply.handle != request.handle)
153	return -EIO;
154
155	return 0;
156	}
157
158	static void nbd_close(BlockDriverState *bs)
159	{
160	BDRVNBDState *s = bs->opaque;
161	struct nbd_request request;
162
163	request.type = NBD_CMD_DISC;
164	request.handle = (uint64_t)(intptr_t)bs;
165	request.from = 0;
166	request.len = 0;
167	nbd_send_request(s->sock, &request);
168
169	close(s->sock);
170	}
171
172	static int64_t nbd_getlength(BlockDriverState *bs)
173	{
174	BDRVNBDState *s = bs->opaque;
175
176	return s->size;
177	}
178
179	BlockDriver bdrv_nbd = {
180	"nbd",
181	sizeof(BDRVNBDState),
182	NULL, /* no probe for protocols */
183	nbd_open,
184	nbd_read,
185	nbd_write,
186	nbd_close,
187	.bdrv_getlength = nbd_getlength,
188	.protocol_name = "nbd",
189	};