block: Inline blk_integrity in struct gendisk
authorMartin K. Petersen <martin.petersen@oracle.com>
Wed, 21 Oct 2015 17:19:49 +0000 (13:19 -0400)
committerJens Axboe <axboe@fb.com>
Wed, 21 Oct 2015 20:42:42 +0000 (14:42 -0600)
commit25520d55cdb6ee289abc68f553d364d22478ff54
tree84e447f762e7f60095d0c4d24fdf2d9440f4b06d
parent4c241d08dbfcbdc7a949b91d72707a289d464954
block: Inline blk_integrity in struct gendisk

Up until now the_integrity profile has been dynamically allocated and
attached to struct gendisk after the disk has been made active.

This causes problems because NVMe devices need to register the profile
prior to the partition table being read due to a mandatory metadata
buffer requirement. In addition, DM goes through hoops to deal with
preallocating, but not initializing integrity profiles.

Since the integrity profile is small (4 bytes + a pointer), Christoph
suggested moving it to struct gendisk proper. This requires several
changes:

 - Moving the blk_integrity definition to genhd.h.

 - Inlining blk_integrity in struct gendisk.

 - Removing the dynamic allocation code.

 - Adding helper functions which allow gendisk to set up and tear down
   the integrity sysfs dir when a disk is added/deleted.

 - Adding a blk_integrity_revalidate() callback for updating the stable
   pages bdi setting.

 - The calls that depend on whether a device has an integrity profile or
   not now key off of the bi->profile pointer.

 - Simplifying the integrity support routines in DM (Mike Snitzer).

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
block/blk-integrity.c
block/genhd.c
block/partition-generic.c
drivers/md/dm-table.c
drivers/md/md.c
drivers/nvdimm/core.c
drivers/nvme/host/pci.c
fs/block_dev.c
include/linux/blkdev.h
include/linux/genhd.h