nebula: bump to v2.6
fs/dyn_sync_cntrl: dynamic sync control [1/2]

The dynamic sync control interface uses Android kernel's unique early
suspend / lat resume interface.

While screen is on, file sync is disabled
when screen is off, a file sync is called to flush all outstanding writes
and restore file sync operation as normal.

Signed-off-by: Paul Reioux <reioux@gmail.com>
fs/dyn_sync_cntrl: dynamic sync control [2/2]
- fix sync.c
- enable dynamic sync control in defconfig
fs/dyn_sync_cntrl: fix fs-writeback
fs/dyn_fsync: check if dyn fsync control is active prior to performing fsync operations
dynamic filesync: add some cache optimizations
by faux123
dynamic fsync: favor true case since most will be using this feature
dynamic fsync: don't disable fdatasync()