Check that every bs file return the same length.
If not return -EIO to disable the quorum and
avoid length discrepancy.
Signed-off-by: Benoit Canet <ben...@irqsave.net>
---
block/quorum.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/block/quorum.c b/block/quorum.c
index 4c552e4..fe920e7 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -497,12 +497,32 @@ static BlockDriverAIOCB
*quorum_aio_writev(BlockDriverState *bs,
return &acb->common;
}
+static int64_t quorum_getlength(BlockDriverState *bs)
+{
+ BDRVQuorumState *s = bs->opaque;
+ int64_t result;
+ int i;
+
+ /* check that every file have the same length */
+ result = bdrv_getlength(s->bs[0]);
+ for (i = 1; i < s->total; i++) {
+ int64_t value = bdrv_getlength(s->bs[i]);
+ if (value != result) {
+ return -EIO;
+ }
+ }
+
+ return result;
+}
+
static BlockDriver bdrv_quorum = {
.format_name = "quorum",
.protocol_name = "quorum",
.instance_size = sizeof(BDRVQuorumState),
+ .bdrv_getlength = quorum_getlength,
+
.bdrv_aio_readv = quorum_aio_readv,
.bdrv_aio_writev = quorum_aio_writev,
};
--
1.7.10.4
