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qcow2: Mark qcow2_signal_corruption() and callers GRAPH_RDLOCK

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This adds GRAPH_RDLOCK annotations to declare that callers of
qcow2_signal_corruption() need to hold a reader lock for the graph
because it calls bdrv_get_node_name(), which accesses the parents list
of a node.

For some places, we know that they will hold the lock, but we don't have
the GRAPH_RDLOCK annotations yet. In this case, add assume_graph_lock()
with a FIXME comment. These places will be removed once everything is
properly annotated.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-15-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-29 16:51:49 +02:00
parent bd131d6705
commit 0bb79c97fd
11 changed files with 249 additions and 191 deletions
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8
block/replication.c
View file

@ -307,13 +307,16 @@ out:
return ret;
}
static void secondary_do_checkpoint(BlockDriverState *bs, Error **errp)
static void GRAPH_UNLOCKED
secondary_do_checkpoint(BlockDriverState *bs, Error **errp)
{
BDRVReplicationState *s = bs->opaque;
BdrvChild *active_disk = bs->file;
Error *local_err = NULL;
int ret;
GRAPH_RDLOCK_GUARD_MAINLOOP();
if (!s->backup_job) {
error_setg(errp, "Backup job was cancelled unexpectedly");
return;
@ -531,13 +534,16 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
/* Must be true, or the bdrv_getlength() calls would have failed */
assert(active_disk->bs->drv && hidden_disk->bs->drv);
bdrv_graph_rdlock_main_loop();
if (!active_disk->bs->drv->bdrv_make_empty ||
!hidden_disk->bs->drv->bdrv_make_empty) {
error_setg(errp,
"Active disk or hidden disk doesn't support make_empty");
aio_context_release(aio_context);
bdrv_graph_rdunlock_main_loop();
return;
}
bdrv_graph_rdunlock_main_loop();
/* reopen the backing file in r/w mode */
reopen_backing_file(bs, true, &local_err);