diff options
Diffstat (limited to 'blockdev.c')
| -rw-r--r-- | blockdev.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/blockdev.c b/blockdev.c index e6eba61484..325b7a3bef 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1378,6 +1378,9 @@ static void external_snapshot_action(TransactionAction *action, AioContext *aio_context; uint64_t perm, shared; + /* TODO We'll eventually have to take a writer lock in this function */ + GRAPH_RDLOCK_GUARD_MAINLOOP(); + tran_add(tran, &external_snapshot_drv, state); /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar @@ -2521,6 +2524,9 @@ void qmp_block_commit(const char *job_id, const char *device, int job_flags = JOB_DEFAULT; uint64_t top_perm, top_shared; + /* TODO We'll eventually have to take a writer lock in this function */ + GRAPH_RDLOCK_GUARD_MAINLOOP(); + if (!has_speed) { speed = 0; } @@ -3539,8 +3545,8 @@ out: aio_context_release(aio_context); } -static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, - const char *child_name) +static BdrvChild * GRAPH_RDLOCK +bdrv_find_child(BlockDriverState *parent_bs, const char *child_name) { BdrvChild *child; @@ -3559,9 +3565,11 @@ void qmp_x_blockdev_change(const char *parent, const char *child, BlockDriverState *parent_bs, *new_bs = NULL; BdrvChild *p_child; + bdrv_graph_wrlock(NULL); + parent_bs = bdrv_lookup_bs(parent, parent, errp); if (!parent_bs) { - return; + goto out; } if (!child == !node) { @@ -3570,7 +3578,7 @@ void qmp_x_blockdev_change(const char *parent, const char *child, } else { error_setg(errp, "Either child or node must be specified"); } - return; + goto out; } if (child) { @@ -3578,7 +3586,7 @@ void qmp_x_blockdev_change(const char *parent, const char *child, if (!p_child) { error_setg(errp, "Node '%s' does not have child '%s'", parent, child); - return; + goto out; } bdrv_del_child(parent_bs, p_child, errp); } @@ -3587,10 +3595,13 @@ void qmp_x_blockdev_change(const char *parent, const char *child, new_bs = bdrv_find_node(node); if (!new_bs) { error_setg(errp, "Node '%s' not found", node); - return; + goto out; } bdrv_add_child(parent_bs, new_bs, errp); } + +out: + bdrv_graph_wrunlock(); } BlockJobInfoList *qmp_query_block_jobs(Error **errp) |