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qemu: rewrite NBD command-line builder and parser

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Move the code to an external function, and structure it to prepare
the addition of new features in the next few patches.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-02-25 18:44:22 +01:00 committed by Eric Blake
parent b96e0c18e1
commit db95213e59
1 changed files with 78 additions and 53 deletions
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131
src/qemu/qemu_command.c
View File

@ -2373,6 +2373,45 @@ error:
goto cleanup;
}
static int
qemuParseNBDString(virDomainDiskDefPtr disk)
{
virDomainDiskHostDefPtr h = NULL;
char *host, *port;
if (VIR_ALLOC(h) < 0)
goto no_memory;
host = disk->src + strlen("nbd:");
port = strchr(host, ':');
if (!port) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot parse nbd filename '%s'"), disk->src);
goto error;
}
*port++ = '\0';
h->name = strdup(host);
if (!h->name)
goto no_memory;
h->port = strdup(port);
if (!h->port)
goto no_memory;
VIR_FREE(disk->src);
disk->nhosts = 1;
disk->hosts = h;
return 0;
no_memory:
virReportOOMError();
error:
virDomainDiskHostDefFree(h);
VIR_FREE(h);
return -1;
}
static int
qemuBuildGlusterString(virDomainDiskDefPtr disk, virBufferPtr opt)
{
@ -2434,6 +2473,39 @@ no_memory:
goto cleanup;
}
#define QEMU_DEFAULT_NBD_PORT "10809"
static int
qemuBuildNBDString(virDomainDiskDefPtr disk, virBufferPtr opt)
{
const char *transp;
if (disk->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("nbd accepts only one host"));
return -1;
}
virBufferAddLit(opt, "file=nbd:");
switch (disk->hosts->transport) {
case VIR_DOMAIN_DISK_PROTO_TRANS_TCP:
if (disk->hosts->name)
virBufferEscape(opt, ',', ",", "%s", disk->hosts->name);
virBufferEscape(opt, ',', ",", ":%s",
disk->hosts->port ? disk->hosts->port :
QEMU_DEFAULT_NBD_PORT);
break;
default:
transp = virDomainDiskProtocolTransportTypeToString(disk->hosts->transport);
virReportError(VIR_ERR_INTERNAL_ERROR,
_("nbd does not support transport '%s'"), transp);
break;
}
return 0;
}
char *
qemuBuildDriveStr(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainDiskDefPtr disk,
@ -2553,13 +2625,9 @@ qemuBuildDriveStr(virConnectPtr conn ATTRIBUTE_UNUSED,
} else if (disk->type == VIR_DOMAIN_DISK_TYPE_NETWORK) {
switch (disk->protocol) {
case VIR_DOMAIN_DISK_PROTOCOL_NBD:
if (disk->nhosts != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("NBD accepts only one host"));
if (qemuBuildNBDString(disk, &opt) < 0)
goto error;
}
virBufferAsprintf(&opt, "file=nbd:%s:%s,",
disk->hosts->name, disk->hosts->port);
virBufferAddChar(&opt, ',');
break;
case VIR_DOMAIN_DISK_PROTOCOL_RBD:
virBufferAddLit(&opt, "file=");
@ -7731,39 +7799,11 @@ qemuParseCommandLineDisk(virCapsPtr qemuCaps,
if (STRPREFIX(def->src, "/dev/"))
def->type = VIR_DOMAIN_DISK_TYPE_BLOCK;
else if (STRPREFIX(def->src, "nbd:")) {
char *host, *port;
def->type = VIR_DOMAIN_DISK_TYPE_NETWORK;
def->protocol = VIR_DOMAIN_DISK_PROTOCOL_NBD;
host = def->src + strlen("nbd:");
port = strchr(host, ':');
if (!port) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot parse nbd filename '%s'"),
def->src);
goto error;
}
*port++ = '\0';
if (VIR_ALLOC(def->hosts) < 0) {
virReportOOMError();
goto error;
}
def->nhosts = 1;
def->hosts->name = strdup(host);
if (!def->hosts->name) {
virReportOOMError();
goto error;
}
def->hosts->port = strdup(port);
if (!def->hosts->port) {
virReportOOMError();
goto error;
}
def->hosts->transport = VIR_DOMAIN_DISK_PROTO_TRANS_TCP;
def->hosts->socket = NULL;
VIR_FREE(def->src);
def->src = NULL;
if (qemuParseNBDString(def) < 0)
goto error;
} else if (STRPREFIX(def->src, "rbd:")) {
char *p = def->src;
@ -8994,7 +9034,6 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr qemuCaps,
else if (STRPREFIX(val, "nbd:")) {
disk->type = VIR_DOMAIN_DISK_TYPE_NETWORK;
disk->protocol = VIR_DOMAIN_DISK_PROTOCOL_NBD;
val += strlen("nbd:");
} else if (STRPREFIX(val, "rbd:")) {
disk->type = VIR_DOMAIN_DISK_TYPE_NETWORK;
disk->protocol = VIR_DOMAIN_DISK_PROTOCOL_RBD;
@ -9034,26 +9073,12 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr qemuCaps,
goto no_memory;
if (disk->type == VIR_DOMAIN_DISK_TYPE_NETWORK) {
char *host, *port;
char *port;
switch (disk->protocol) {
case VIR_DOMAIN_DISK_PROTOCOL_NBD:
host = disk->src;
port = strchr(host, ':');
if (!port) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot parse nbd filename '%s'"), disk->src);
if (qemuParseNBDString(disk) < 0)
goto error;
}
*port++ = '\0';
if (VIR_ALLOC(disk->hosts) < 0)
goto no_memory;
disk->nhosts = 1;
disk->hosts->name = disk->src;
disk->src = NULL;
disk->hosts->port = strdup(port);
if (!disk->hosts->port)
goto no_memory;
break;
case VIR_DOMAIN_DISK_PROTOCOL_RBD:
/* old-style CEPH_ARGS env variable is parsed later */