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| author | Kevin Wolf <kwolf@redhat.com> | 2019-07-22 17:44:27 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-08-16 10:25:16 +0200 |
| commit | d2da5e288a2e71e82866c8fdefd41b5727300124 (patch) | |
| tree | dc1fe8c9ec21fd5f96c92f348e4c87698b416b6f /block | |
| parent | 421919d76b1755e1f9478f85cb71829ca5150ade (diff) | |
| download | qemu-d2da5e288a2e71e82866c8fdefd41b5727300124.zip qemu-d2da5e288a2e71e82866c8fdefd41b5727300124.tar.gz qemu-d2da5e288a2e71e82866c8fdefd41b5727300124.tar.bz2 | |
mirror: Keep mirror_top_bs drained after dropping permissions
mirror_top_bs is currently implicitly drained through its connection to
the source or the target node. However, the drain section for target_bs
ends early after moving mirror_top_bs from src to target_bs, so that
requests can already be restarted while mirror_top_bs is still present
in the chain, but has dropped all permissions and therefore runs into an
assertion failure like this:
qemu-system-x86_64: block/io.c:1634: bdrv_co_write_req_prepare:
Assertion `child->perm & BLK_PERM_WRITE' failed.
Keep mirror_top_bs drained until all graph changes have completed.
Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/mirror.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/block/mirror.c b/block/mirror.c index 9f5c59e..642d657 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -656,7 +656,10 @@ static int mirror_exit_common(Job *job) s->target = NULL; /* We don't access the source any more. Dropping any WRITE/RESIZE is - * required before it could become a backing file of target_bs. */ + * required before it could become a backing file of target_bs. Not having + * these permissions any more means that we can't allow any new requests on + * mirror_top_bs from now on, so keep it drained. */ + bdrv_drained_begin(mirror_top_bs); bs_opaque->stop = true; bdrv_child_refresh_perms(mirror_top_bs, mirror_top_bs->backing, &error_abort); @@ -724,6 +727,7 @@ static int mirror_exit_common(Job *job) bs_opaque->job = NULL; bdrv_drained_end(src); + bdrv_drained_end(mirror_top_bs); s->in_drain = false; bdrv_unref(mirror_top_bs); bdrv_unref(src); |