On 02/02/2017 07:56 AM, Jan Kara wrote: > Hello, > > this is the third version of the patch series that attempts to solve the > problems with the life time of a backing_dev_info structure. Currently it lives > inside request_queue structure and thus it gets destroyed as soon as request > queue goes away. However the block device inode still stays around and thus > inode_to_bdi() call on that inode (e.g. from flusher worker) may happen after > request queue has been destroyed resulting in oops. > > This patch set tries to solve these problems by making backing_dev_info > independent structure referenced from block device inode. That makes sure > inode_to_bdi() cannot ever oops. I gave some basic testing to the patches in > KVM and on a real machine, Dan was running them with libnvdimm test suite which > was previously triggering the oops and things look good. So patches should be > reasonably healthy. > > Changes since v2: > * Added Reviewed-by tags > * Removed slab cache for backing_dev_info > * Added patch to remove blkdev_get_backing_dev_info() > > Changes since v1: > * Use kref instead of atomic_t for refcount > * Get rid of free_on_put flag Added for 4.11, thanks Jan! -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
