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blockdev: acquire AioContext in blockdev-snapshot-delete-internal-sync 

Add dataplane support to the blockdev-snapshot-delete-internal-sync QMP
command.  By acquiring the AioContext we avoid race conditions with the
dataplane thread which may also be accessing the BlockDriverState.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-11-19 14:19:42 +00:00 committed by Kevin Wolf
parent 2389eeae69
commit 4ef3982a99
2 changed files with 15 additions and 3 deletions
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16
blockdev.c
View File

@ -1105,6 +1105,7 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
Error **errp)
{
BlockDriverState *bs = bdrv_find(device);
AioContext *aio_context;
QEMUSnapshotInfo sn;
Error *local_err = NULL;
SnapshotInfo *info = NULL;
@ -1128,25 +1129,30 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return NULL;
goto out_aio_context;
}
if (!ret) {
error_setg(errp,
"Snapshot with id '%s' and name '%s' does not exist on "
"device '%s'",
STR_OR_NULL(id), STR_OR_NULL(name), device);
return NULL;
goto out_aio_context;
}
bdrv_snapshot_delete(bs, id, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return NULL;
goto out_aio_context;
}
aio_context_release(aio_context);
info = g_new0(SnapshotInfo, 1);
info->id = g_strdup(sn.id_str);
info->name = g_strdup(sn.name);
@ -1157,6 +1163,10 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
return info;
out_aio_context:
aio_context_release(aio_context);
return NULL;
}
/* New and old BlockDriverState structs for group snapshots */

2
hw/block/dataplane/virtio-blk.c
View File

@ -198,6 +198,8 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker);
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker);
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT, s->blocker);
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
s->blocker);
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_MIRROR, s->blocker);
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker);
blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker);