From 4ef3982a99f9d2634588b4785c8d841605517946 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Wed, 19 Nov 2014 14:19:42 +0000 Subject: [PATCH] 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 Reviewed-by: Max Reitz Signed-off-by: Max Reitz Signed-off-by: Kevin Wolf --- blockdev.c | 16 +++++++++++++--- hw/block/dataplane/virtio-blk.c | 2 ++ 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/blockdev.c b/blockdev.c index 57910b82c7..fb9a0059c3 100644 --- a/blockdev.c +++ b/blockdev.c @@ -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 */ diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c index 1222a37f4f..5ab64c5c42 100644 --- a/hw/block/dataplane/virtio-blk.c +++ b/hw/block/dataplane/virtio-blk.c @@ -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); -- GitLab