Pull VFS fixes and cleanups from Al Viro.
Most of this is the series to remove sync_supers() and the
->write_supers VFS callback from Artem Bityutskiy. One commit to do the
actual removal work, a whole series of commits to fix up stale comments
etc all over the tree.
There's also a regression fix for an incorrect use of mnt_drop_write()
in do_dentry_open().
* 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
missed mnt_drop_write() in do_dentry_open()
UBIFS: nuke pdflush from comments
gfs2: nuke pdflush from comments
drbd: nuke pdflush from comments
nilfs2: nuke write_super from comments
hfs: nuke write_super from comments
vfs: nuke pdflush from comments
jbd/jbd2: nuke write_super from comments
btrfs: nuke pdflush from comments
btrfs: nuke write_super from comments
ext4: nuke pdflush from comments
ext4: nuke write_super from comments
ext3: nuke write_super from comments
Documentation: fix the VM knobs descritpion WRT pdflush
Documentation: get rid of write_super
vfs: kill write_super and sync_supers
e7882d6c40