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nbd: correctly propagate errors

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Before:
    $ ./qemu-io-old
    qemu-io-old> open -r -o file.driver=nbd
    one of path and host must be specified.
    qemu-io-old: can't open device (null): Could not open image: Invalid argument
    $ ./qemu-io-old
    qemu-io-old> open -r -o file.driver=nbd,file.host=foo,file.path=bar
    path and host may not be used at the same time.
    qemu-io-old: can't open device (null): Could not open image: Invalid argument

After:
    $ ./qemu-io
    qemu-io> open -r -o file.driver=nbd
    qemu-io: can't open device (null): one of path and host must be specified.
    $ ./qemu-io
    qemu-io> open -r -o file.driver=nbd,file.host=foo,file.path=bar
    qemu-io: can't open device (null): path and host may not be used at the same time.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-02-17 14:43:49 +01:00 • committed by Kevin Wolf
parent a69d9af449
commit 77e8b9ca64
4 changed files with 18 additions and 35 deletions
Download patch file Download diff file Expand all files Collapse all files

34
block/nbd.c
View file

@ -188,19 +188,18 @@ out:
g_free(file);
}
static int nbd_config(BDRVNBDState *s, QDict *options, char **export)
static void nbd_config(BDRVNBDState *s, QDict *options, char **export,
Error **errp)
{
Error *local_err = NULL;
if (qdict_haskey(options, "path") == qdict_haskey(options, "host")) {
if (qdict_haskey(options, "path")) {
qerror_report(ERROR_CLASS_GENERIC_ERROR, "path and host may not "
"be used at the same time.");
error_setg(errp, "path and host may not be used at the same time.");
} else {
qerror_report(ERROR_CLASS_GENERIC_ERROR, "one of path and host "
"must be specified.");
error_setg(errp, "one of path and host must be specified.");
}
return -EINVAL;
return;
}
s->client.is_unix = qdict_haskey(options, "path");
@ -209,9 +208,8 @@ static int nbd_config(BDRVNBDState *s, QDict *options, char **export)
qemu_opts_absorb_qdict(s->socket_opts, options, &local_err);
if (local_err) {
qerror_report_err(local_err);
error_free(local_err);
return -EINVAL;
error_propagate(errp, local_err);
return;
}
if (!qemu_opt_get(s->socket_opts, "port")) {
@ -222,19 +220,17 @@ static int nbd_config(BDRVNBDState *s, QDict *options, char **export)
if (*export) {
qdict_del(options, "export");
}
return 0;
}
static int nbd_establish_connection(BlockDriverState *bs)
static int nbd_establish_connection(BlockDriverState *bs, Error **errp)
{
BDRVNBDState *s = bs->opaque;
int sock;
if (s->client.is_unix) {
sock = unix_socket_outgoing(qemu_opt_get(s->socket_opts, "path"));
sock = unix_connect_opts(s->socket_opts, errp, NULL, NULL);
} else {
sock = tcp_socket_outgoing_opts(s->socket_opts);
sock = inet_connect_opts(s->socket_opts, errp, NULL, NULL);
if (sock >= 0) {
socket_set_nodelay(sock);
}
@ -255,17 +251,19 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
BDRVNBDState *s = bs->opaque;
char *export = NULL;
int result, sock;
Error *local_err = NULL;
/* Pop the config into our state object. Exit if invalid. */
result = nbd_config(s, options, &export);
if (result != 0) {
return result;
nbd_config(s, options, &export, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return -EINVAL;
}
/* establish TCP connection, return error if it fails
* TODO: Configurable retry-until-timeout behaviour.
*/
sock = nbd_establish_connection(bs);
sock = nbd_establish_connection(bs, errp);
if (sock < 0) {
return sock;
}