Revert "make dynamic fsync control inactive by default"

This reverts commit 27843e95517e51594f324b0650760d24516028d9.
Revert "dynamic fsync: don't disable fdatasync()"

This reverts commit 85a9157abbc6fcf93d1c3b8b7118b6394efe45a7.
Revert "dynamic fsync: add kernel panic notifier to force flush outstanding data"

This reverts commit 14b4b1eec8c6a09b0eb1d7750d413fa602b2aeaa.
Revert "dynamic fsync: add reboot notifier to force flush outstanding data"

This reverts commit 3db5211d1f5149a57f98d56ca8c110b509ff13bf.
Revert "dynamic fsync: favor true case since most will be using this feature"

This reverts commit ab46f08e405ac5f7a5013e6554b13ac5be671c2b.
Revert "dynamic filesync: add some cache optimizations"

This reverts commit 23feb87f05c2510df793382176bf07004c539797.
Revert "fs/dyn_fsync: check dyn fsync control's active prior to performing fsync ops"

This reverts commit 6f4cf85fcff413cd81337a6f56c42ba080f5296e.
Revert "fs/dyn_sync_cntrl: Linux 3.4 Kernel compatibility fixup"

This reverts commit f08f425e4853aa23e92d67f0dd4a2d4292934aa6.
Revert "fs/dyn_sync_cntrl: dynamic sync control"

This reverts commit c7d9acc6858832d694eed0d63a883367ffd9a08d.