qemu-io: Fix writethrough check in reopen
"qemu-io reopen" doesn't allow changing the writethrough setting of
the cache, but the check is wrong, causing an error even on a simple
reopen with the default parameters:
$ qemu-img create -f qcow2 hd.qcow2 1M
$ qemu-system-x86_64 -monitor stdio -drive if=virtio,file=hd.qcow2
(qemu) qemu-io virtio0 reopen
Cannot change cache.writeback: Device attached
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 5bf5f28..db0b3ee 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -2025,7 +2025,7 @@
return -EINVAL;
}
- if (writethrough != blk_enable_write_cache(blk) &&
+ if (!writethrough != blk_enable_write_cache(blk) &&
blk_get_attached_dev(blk))
{
error_report("Cannot change cache.writeback: Device attached");