diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2023-09-11 11:46:19 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2023-09-20 17:46:01 +0200 |
| commit | 32a8aba37eaae54d3a0a7ae5e93e3e157525660a (patch) | |
| tree | c310d966906d71c635c89425f2e1f314dfafdba9 /block/snapshot.c | |
| parent | ede01e4635050a395eacd57b7d7fbea8ea208704 (diff) | |
block: Mark bdrv_unref_child() GRAPH_WRLOCK
Instead of taking the writer lock internally, require callers to already
hold it when calling bdrv_unref_child(). These callers will typically
already hold the graph lock once the locking work is completed, which
means that they can't call functions that take it internally.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230911094620.45040-21-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/snapshot.c')
| -rw-r--r-- | block/snapshot.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/snapshot.c b/block/snapshot.c index e22ac3eac6..b86b5b24ad 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -281,7 +281,9 @@ int bdrv_snapshot_goto(BlockDriverState *bs, } /* .bdrv_open() will re-attach it */ + bdrv_graph_wrlock(NULL); bdrv_unref_child(bs, fallback); + bdrv_graph_wrunlock(); ret = bdrv_snapshot_goto(fallback_bs, snapshot_id, errp); open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err); |