[PATCH 05/25] fs: Get proper reference for s_bdi

So far we just relied on block device to hold a bdi reference for us while the filesystem is mounted. While that works perfectly fine, it is a bit awkward that we have a pointer to a refcounted structure in the superblock without proper reference. So make s_bdi hold a proper reference to block

Re: [PATCH 05/25] fs: Get proper reference for s_bdi

Looks fine, Reviewed-by: Christoph Hellwig

[PATCH 05/25] fs: Get proper reference for s_bdi

So far we just relied on block device to hold a bdi reference for us while the filesystem is mounted. While that works perfectly fine, it is a bit awkward that we have a pointer to a refcounted structure in the superblock without proper reference. So make s_bdi hold a proper reference to block