Hello, these patches fix races happening when devices are frequently destroyed and recreated in association of block device inode with corresponding gendisk. Generally when such race happen it results in use-after-free issues, block device page cache inconsistencies, or other problems. I have verified these patches fix use-after-free issues that could be reproduced by frequent creation and destruction of loop device. I was not able to reproduce races reported by Hou Tao [1] related to gendisk-blkdev association (at least I was not able to hit any issues with stressing using scsi_debug in various ways with or without patches). My patches should fix those but it would be great if Tao could verify that. Any comments and review welcome! Honza [1] https://www.spinics.net/lists/linux-block/msg20015.html
