fs/dyn_sync_cntrl: check dyn fsync control's active prior to performing fsync ops

Signed-off-by: Andrew Bartholomew <andrewb03@gmail.com>
fs/dyn_sync_cntrl: add some cache optimizations

and clean up file format and typos

bump version to 1.1

Signed-off-by: Paul Reioux <reioux@gmail.com>
fs/dyn_sync_cntrl: add reboot notifier to force flush outstanding data

this should further prevent data corruption from kernel panics and
forced reboots

bump version to 1.2

Signed-off-by: Paul Reioux <reioux@gmail.com>
fs/dyn_sync_cntrl: add kernel panic notifier to force flush outstanding data

more paranoia safety checks

Signed-off-by: Paul Reioux <reioux@gmail.com>
fs: sync: Don't disable fdatasync()