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block: push error reporting into bdrv_all_*_snapshot functions

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The bdrv_all_*_snapshot functions return a BlockDriverState pointer
for the invalid backend, which the callers then use to report an
error message. In some cases multiple callers are reporting the
same error message, but with slightly different text. In the future
there will be more error scenarios for some of these methods, which
will benefit from fine grained error message reporting. So it is
helpful to push error reporting down a level.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
[PMD: Initialize variables]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210204124834.774401-2-berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-02-04 12:48:23 +00:00 • committed by Dr. David Alan Gilbert
parent a64aec725e
commit e26f98e209
7 changed files with 68 additions and 90 deletions
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39
migration/savevm.c
View file

@ -2766,7 +2766,7 @@ int qemu_load_device_state(QEMUFile *f)
int save_snapshot(const char *name, Error **errp)
{
BlockDriverState *bs, *bs1;
BlockDriverState *bs;
QEMUSnapshotInfo sn1, *sn = &sn1;
int ret = -1, ret2;
QEMUFile *f;
@ -2786,25 +2786,19 @@ int save_snapshot(const char *name, Error **errp)
return ret;
}
if (!bdrv_all_can_snapshot(&bs)) {
error_setg(errp, "Device '%s' is writable but does not support "
"snapshots", bdrv_get_device_or_node_name(bs));
if (!bdrv_all_can_snapshot(errp)) {
return ret;
}
/* Delete old snapshots of the same name */
if (name) {
ret = bdrv_all_delete_snapshot(name, &bs1, errp);
if (ret < 0) {
error_prepend(errp, "Error while deleting snapshot on device "
"'%s': ", bdrv_get_device_or_node_name(bs1));
if (bdrv_all_delete_snapshot(name, errp) < 0) {
return ret;
}
}
bs = bdrv_all_find_vmstate_bs();
bs = bdrv_all_find_vmstate_bs(errp);
if (bs == NULL) {
error_setg(errp, "No block device can accept snapshots");
return ret;
}
aio_context = bdrv_get_aio_context(bs);
@ -2868,11 +2862,9 @@ int save_snapshot(const char *name, Error **errp)
aio_context_release(aio_context);
aio_context = NULL;
ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, &bs);
ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, errp);
if (ret < 0) {
error_setg(errp, "Error while creating snapshot on '%s'",
bdrv_get_device_or_node_name(bs));
bdrv_all_delete_snapshot(sn->name, &bs, NULL);
bdrv_all_delete_snapshot(sn->name, NULL);
goto the_end;
}
@ -2975,30 +2967,23 @@ void qmp_xen_load_devices_state(const char *filename, Error **errp)
int load_snapshot(const char *name, Error **errp)
{
BlockDriverState *bs, *bs_vm_state;
BlockDriverState *bs_vm_state;
QEMUSnapshotInfo sn;
QEMUFile *f;
int ret;
AioContext *aio_context;
MigrationIncomingState *mis = migration_incoming_get_current();
if (!bdrv_all_can_snapshot(&bs)) {
error_setg(errp,
"Device '%s' is writable but does not support snapshots",
bdrv_get_device_or_node_name(bs));
if (!bdrv_all_can_snapshot(errp)) {
return -ENOTSUP;
}
ret = bdrv_all_find_snapshot(name, &bs);
ret = bdrv_all_find_snapshot(name, errp);
if (ret < 0) {
error_setg(errp,
"Device '%s' does not have the requested snapshot '%s'",
bdrv_get_device_or_node_name(bs), name);
return ret;
}
bs_vm_state = bdrv_all_find_vmstate_bs();
bs_vm_state = bdrv_all_find_vmstate_bs(errp);
if (!bs_vm_state) {
error_setg(errp, "No block device supports snapshots");
return -ENOTSUP;
}
aio_context = bdrv_get_aio_context(bs_vm_state);
@ -3024,10 +3009,8 @@ int load_snapshot(const char *name, Error **errp)
/* Flush all IO requests so they don't interfere with the new state. */
bdrv_drain_all_begin();
ret = bdrv_all_goto_snapshot(name, &bs, errp);
ret = bdrv_all_goto_snapshot(name, errp);
if (ret < 0) {
error_prepend(errp, "Could not load snapshot '%s' on '%s': ",
name, bdrv_get_device_or_node_name(bs));
goto err_drain;
}