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authorBenoƮt Canet <benoit@irqsave.net>2014-02-21 22:21:16 +0100
committerKevin Wolf <kwolf@redhat.com>2014-02-21 22:29:50 +0100
commitd55dee2044791a02394a3db7055cedac68dca26b (patch)
treeb79abcebcf1f8d2831f9846e961edcd4e86dabbf /block
parent95c6bff3561eedaf7c7de287bc4a002720605a8d (diff)
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quorum: Add quorum_getlength().
Check that every bs file returns the same length. Otherwise, return -EIO to disable the quorum and avoid length discrepancy. Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/quorum.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/block/quorum.c b/block/quorum.c
index 4beee96..c6ea862 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -595,12 +595,38 @@ 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 all file have the same length */
+ result = bdrv_getlength(s->bs[0]);
+ if (result < 0) {
+ return result;
+ }
+ for (i = 1; i < s->num_children; i++) {
+ int64_t value = bdrv_getlength(s->bs[i]);
+ if (value < 0) {
+ return value;
+ }
+ 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,
};