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nbd: Introduce NBD named exports.

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This patch allows to connect Qemu using NBD protocol to an nbd-server
using named exports.

For instance, if on the host "isoserver", in /etc/nbd-server/config, you have:

[generic]
[debian-500-ppc-netinst]
        exportname = /ISO/debian-500-powerpc-netinst.iso
[Fedora-10-ppc-netinst]
        exportname = /ISO/Fedora-10-ppc-netinst.iso

You can connect to it, using:

    qemu -cdrom nbd:isoserver:exportname=debian-500-ppc-netinst
    qemu -cdrom nbd:isoserver:exportname=Fedora-10-ppc-netinst

NOTE: you need at least nbd-server 2.9.18

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Laurent Vivier 2010-08-25 22:48:33 +02:00 • committed by Kevin Wolf
parent 2aa326be0d
commit 1d45f8b542
5 changed files with 168 additions and 32 deletions
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66
block/nbd.c
View file

@ -33,6 +33,8 @@
#include <sys/types.h>
#include <unistd.h>
#define EN_OPTSTR ":exportname="
typedef struct BDRVNBDState {
int sock;
off_t size;
@ -42,55 +44,83 @@ typedef struct BDRVNBDState {
static int nbd_open(BlockDriverState *bs, const char* filename, int flags)
{
BDRVNBDState *s = bs->opaque;
uint32_t nbdflags;
char *file;
char *name;
const char *host;
const char *unixpath;
int sock;
off_t size;
size_t blocksize;
int ret;
int err = -EINVAL;
if (!strstart(filename, "nbd:", &host))
return -EINVAL;
file = qemu_strdup(filename);
name = strstr(file, EN_OPTSTR);
if (name) {
if (name[strlen(EN_OPTSTR)] == 0) {
goto out;
}
name[0] = 0;
name += strlen(EN_OPTSTR);
}
if (!strstart(file, "nbd:", &host)) {
goto out;
}
if (strstart(host, "unix:", &unixpath)) {
if (unixpath[0] != '/')
return -EINVAL;
if (unixpath[0] != '/') {
goto out;
}
sock = unix_socket_outgoing(unixpath);
} else {
uint16_t port;
uint16_t port = NBD_DEFAULT_PORT;
char *p, *r;
char hostname[128];
pstrcpy(hostname, 128, host);
p = strchr(hostname, ':');
if (p == NULL)
return -EINVAL;
if (p != NULL) {
*p = '\0';
p++;
*p = '\0';
p++;
port = strtol(p, &r, 0);
if (r == p) {
goto out;
}
} else if (name == NULL) {
goto out;
}
port = strtol(p, &r, 0);
if (r == p)
return -EINVAL;
sock = tcp_socket_outgoing(hostname, port);
}
if (sock == -1)
return -errno;
if (sock == -1) {
err = -errno;
goto out;
}
ret = nbd_receive_negotiate(sock, &size, &blocksize);
if (ret == -1)
return -errno;
ret = nbd_receive_negotiate(sock, name, &nbdflags, &size, &blocksize);
if (ret == -1) {
err = -errno;
goto out;
}
s->sock = sock;
s->size = size;
s->blocksize = blocksize;
err = 0;
return 0;
out:
qemu_free(file);
return err;
}
static int nbd_read(BlockDriverState *bs, int64_t sector_num,