Revert "vfs: Create function for iterating over block devices"

This reverts commit cc07def4b733759000b4a4e21bba510a1595131e.
Revert "vfs: Avoid unnecessary WB_SYNC_NONE writeback during sys_sync and reorder sync passes"

This reverts commit 7fa572d654cd5dedbd095c0c7510c8874b69d290.
Revert "vfs: Remove unnecessary flushing of block devices"

This reverts commit 3c3e29d73d29366702df5c91517b3b0200175f10.
Revert "vfs: Make sys_sync writeout also block device inodes"

This reverts commit 2a8c2593c2fe1eaa9fdab2e8761da1b070f08a51.
Revert "vfs: Reorder operations during sys_sync"

This reverts commit 4b5b3883887e6bfa6ce998dab92df7852ba32511.
Revert "vfs: Move noop_backing_dev_info check from sync into writeback"

This reverts commit 258b291b0d8fc5d1e0f0ba9369aeecf58fae81d9.