Re: [PATCH 3/3] blk-cgroup: only grab an inode reference to the disk for each blkg

Ming Lei
2023-02-13T12:14:20Z

On Mon, Feb 13, 2023 at 11:41:34AM +0100, Christoph Hellwig wrote:
> To avoid a circular reference, do not grab a device model reference
> to the gendisk for each blkg, but just the lower level inode reference
> preventing the memory from beeing freed.

It might not be enough to just prevent gendisk memory from being freed,
anywhere queue reference via disk->queue could become not safe given
disk->queue can be released after disk_release() is called.

thanks,
Ming