ext4: Fix async commit mode to be safe by using a barrier and writeback: get rid of wbc->for_writepages
ext4, jbd2: Drop unneeded printks at mount and unmount time
misc fixes after ext4 update
add gcd and fs: move bdev code out of buffer.c

Conflicts:
	block/blk-settings.c
	block/blk-sysfs.c
	block/genhd.c
	fs/partitions/check.c
	include/linux/blkdev.h
	include/linux/genhd.h