Hello, this is a series with the remaining patches (on top of 4.11-rc2) to fix several different races and issues I've found when testing device shutdown and reuse. The first patch fixes possible (theoretical) problems when opening of a block device races with shutdown of a gendisk structure. Patches 2-8 fix oops that is triggered by __blkdev_put() calling inode_detach_wb() too early (the problem reported by Thiago). Patches 9 and 10 fix oops due to a bug in gendisk code where get_gendisk() can return already freed gendisk structure (again triggered by Omar's stress test). All patches got reviewed by Tejun and also tested by Thiago (thanks!). Jens, can you please queue these fixes for the next merge window? Thanks! Changes since v4: * Dropped patch fixing possible gendisk shutdown vs blkdev_open race - needs more thinking * Added Tejun's ack Changes since v3: * Rebased on top of 4.11-rc2 * Reworked patch 2 (block: Fix race of bdev open with gendisk shutdown) based on Tejun's feedback * Significantly updated patch 5 (and dropped previous Tejun's ack) to accommodate for fixes to SCSI re-registration of BDI that went to 4.11-rc2 Changes since v2: * Added Tejun's acks * Rebased on top of 4.11-rc1 * Fixed two possible races between blkdev_open() and del_gendisk() * Fixed possible race between concurrent shutdown of cgwb spotted by Tejun Changes since v1: * Added Acks and Tested-by tags for patches in areas that did not change * Reworked inode_detach_wb() related fixes based on Tejun's feedback Honza
