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| author | Alberto Garcia <berto@igalia.com> | 2018-10-18 11:59:03 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2018-11-05 15:09:54 +0100 |
| commit | 808b27d464287666821483257289b1a3379264b2 (patch) | |
| tree | 1d9cecb2bec37f73be67a9b7226f2090773d6be1 /block/quorum.c | |
| parent | 82c4c85978da41294fbd1d621fec373a4be6788f (diff) | |
| download | qemu-808b27d464287666821483257289b1a3379264b2.zip qemu-808b27d464287666821483257289b1a3379264b2.tar.gz qemu-808b27d464287666821483257289b1a3379264b2.tar.bz2 | |
quorum: Forbid adding children in blkverify mode
The blkverify mode of Quorum only works when the number of children is
exactly two, so any attempt to add a new one must return an error.
quorum_del_child() on the other hand doesn't need any additional check
because decreasing the number of children would make it go under the
vote threshold.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/quorum.c')
| -rw-r--r-- | block/quorum.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/quorum.c b/block/quorum.c index 6188ff6..16b3c80 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -992,6 +992,11 @@ static void quorum_add_child(BlockDriverState *bs, BlockDriverState *child_bs, char indexstr[32]; int ret; + if (s->is_blkverify) { + error_setg(errp, "Cannot add a child to a quorum in blkverify mode"); + return; + } + assert(s->num_children <= INT_MAX / sizeof(BdrvChild *)); if (s->num_children == INT_MAX / sizeof(BdrvChild *) || s->next_child_index == UINT_MAX) { @@ -1046,6 +1051,9 @@ static void quorum_del_child(BlockDriverState *bs, BdrvChild *child, return; } + /* We know now that num_children > threshold, so blkverify must be false */ + assert(!s->is_blkverify); + bdrv_drained_begin(bs); /* We can safely remove this child now */ |