diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2016-11-05 00:03:15 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-11-08 16:06:35 +0000 |
| commit | e6af1e085416378918cca357bf2abd8b90224667 (patch) | |
| tree | 721eaab75a6195c3191965ae4a0f351328272f8d /block/io.c | |
| parent | 207faf24c58859f5240f66bf6decc33b87a1776e (diff) | |
| download | qemu-e6af1e085416378918cca357bf2abd8b90224667.tar.gz | |
block: Don't mark node clean after failed flush
Commit 3ff2f67a changed bdrv_co_flush() so that no flush is issues if
the image hasn't been dirtied since the last flush. This is not quite
correct: The condition should be that the image hasn't been dirtied
since the last _successful_ flush. This patch changes the logic
accordingly.
Without this fix, subsequent bdrv_co_flush() calls would return success
without actually doing anything even though the image is still dirty.
The difference is visible in some blkdebug test cases where error
messages incorrectly disappeared after commit 3ff2f67a.
Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 1478300595-10090-1-git-send-email-kwolf@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/io.c')
| -rw-r--r-- | block/io.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/io.c b/block/io.c index 37749b680a..aa532a5c1f 100644 --- a/block/io.c +++ b/block/io.c @@ -2372,7 +2372,9 @@ flush_parent: ret = bs->file ? bdrv_co_flush(bs->file->bs) : 0; out: /* Notify any pending flushes that we have completed */ - bs->flushed_gen = current_gen; + if (ret == 0) { + bs->flushed_gen = current_gen; + } bs->active_flush_req = false; /* Return value is ignored - it's ok if wait queue is empty */ qemu_co_queue_next(&bs->flush_queue); |