From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
To: qemu-block@nongnu.org
Cc: kwolf@redhat.com, den@openvz.org, vsementsov@virtuozzo.com,
qemu-devel@nongnu.org, mreitz@redhat.com
Subject: [Qemu-devel] [PATCH 1/2] block/raw-format: switch to BDRV_BLOCK_DATA with BDRV_BLOCK_RECURSE
Date: Mon, 12 Aug 2019 21:11:45 +0300 [thread overview]
Message-ID: <20190812181146.26121-2-vsementsov@virtuozzo.com> (raw)
In-Reply-To: <20190812181146.26121-1-vsementsov@virtuozzo.com>
BDRV_BLOCK_RAW makes generic bdrv_co_block_status to fallthrough to
returned file. But is it correct behavior at all? If returned file
itself has a backing file, we may report as totally unallocated and
area which actually has data in bottom backing file.
So, mirroring of qcow2 under raw-format is broken. Which is illustrated
by following commit with a test. Let's make raw-format behave more
correctly returning BDRV_BLOCK_DATA.
Suggested-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/raw-format.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/raw-format.c b/block/raw-format.c
index bffd424dd0..a273ee2387 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -275,7 +275,7 @@ static int coroutine_fn raw_co_block_status(BlockDriverState *bs,
*pnum = bytes;
*file = bs->file->bs;
*map = offset + s->offset;
- return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
+ return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_RECURSE;
}
static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
--
2.18.0
next prev parent reply other threads:[~2019-08-12 18:13 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 18:11 [Qemu-devel] [PATCH 0/2] deal with BDRV_BLOCK_RAW Vladimir Sementsov-Ogievskiy
2019-08-12 18:11 ` Vladimir Sementsov-Ogievskiy [this message]
2019-08-13 11:04 ` [Qemu-devel] [PATCH 1/2] block/raw-format: switch to BDRV_BLOCK_DATA with BDRV_BLOCK_RECURSE Kevin Wolf
2019-08-13 11:28 ` Vladimir Sementsov-Ogievskiy
2019-08-13 12:01 ` Kevin Wolf
2019-08-13 13:21 ` [Qemu-devel] [Qemu-block] " Kevin Wolf
2019-08-13 14:46 ` Max Reitz
2019-08-13 14:43 ` [Qemu-devel] " Max Reitz
2019-08-13 14:56 ` Vladimir Sementsov-Ogievskiy
2019-08-13 15:03 ` Max Reitz
2019-08-13 15:22 ` Vladimir Sementsov-Ogievskiy
2019-08-13 16:07 ` Max Reitz
2019-08-13 15:41 ` Kevin Wolf
2019-08-13 15:54 ` Vladimir Sementsov-Ogievskiy
2019-08-13 16:08 ` Kevin Wolf
2019-08-13 16:32 ` Vladimir Sementsov-Ogievskiy
2019-08-14 6:27 ` Vladimir Sementsov-Ogievskiy
2019-08-13 16:21 ` Max Reitz
2019-08-12 18:11 ` [Qemu-devel] [PATCH 2/2] iotests: test mirroring qcow2 under raw format Vladimir Sementsov-Ogievskiy
2019-08-13 9:10 ` Kevin Wolf
2019-08-13 9:22 ` Vladimir Sementsov-Ogievskiy
2019-08-13 9:36 ` Kevin Wolf
2019-08-12 19:46 ` [Qemu-devel] [PATCH 0/2] deal with BDRV_BLOCK_RAW Max Reitz
2019-08-12 19:50 ` Max Reitz
2019-08-13 8:39 ` Vladimir Sementsov-Ogievskiy
2019-08-13 9:01 ` Vladimir Sementsov-Ogievskiy
2019-08-13 9:33 ` Vladimir Sementsov-Ogievskiy
2019-08-13 11:14 ` Vladimir Sementsov-Ogievskiy
2019-08-13 11:51 ` Kevin Wolf
2019-08-13 13:00 ` Vladimir Sementsov-Ogievskiy
2019-08-13 14:31 ` Max Reitz
2019-08-13 14:46 ` Vladimir Sementsov-Ogievskiy
2019-08-13 14:53 ` Max Reitz
2019-08-13 15:03 ` Kevin Wolf
2019-08-13 15:04 ` Max Reitz
2019-08-13 14:50 ` Eric Blake
2019-08-13 9:34 ` Kevin Wolf
2019-08-13 14:38 ` Max Reitz
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