move bd_mutex to the gendisk (resend)

Christoph Hellwig
2021-05-12T06:19:11Z

Hi all,

this series first cleans up gendisk allocation in the md driver to remove
the ERESTARTSYS hack in blkdev_get, then further refactors blkdev_get
and then finally moves bd_mutex into the gendisk as having separate locks
for the whole device vs partitions just complicates locking in places that
add an remove partitions a lot.

Diffstat:
Documentation/filesystems/locking.rst | 2
block/genhd.c | 59 +++------
block/ioctl.c | 2
block/partitions/core.c | 45 +++----
drivers/block/loop.c | 14 +-
drivers/block/xen-blkfront.c | 8 -
drivers/block/zram/zram_drv.c | 18 +--
drivers/block/zram/zram_drv.h | 2
drivers/md/md.h | 6 -
drivers/s390/block/dasd_genhd.c | 8 -
drivers/scsi/sd.c | 4
fs/block_dev.c | 204 ++++++++++++++++------------------
fs/btrfs/volumes.c | 2
fs/super.c | 8 -
include/linux/blk_types.h | 4
include/linux/genhd.h | 6 -
init/do_mounts.c | 10 -
17 files changed, 184 insertions(+), 218 deletions(-)