diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/copy-before-write.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/block/copy-before-write.c b/block/copy-before-write.c index a7996d54db..2a51cc64e4 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -142,10 +142,12 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c, bdrv_default_perms(bs, c, role, reopen_queue, perm, shared, nperm, nshared); - if (perm & BLK_PERM_WRITE) { - *nperm = *nperm | BLK_PERM_CONSISTENT_READ; + if (!QLIST_EMPTY(&bs->parents)) { + if (perm & BLK_PERM_WRITE) { + *nperm = *nperm | BLK_PERM_CONSISTENT_READ; + } + *nshared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); } - *nshared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); } } |