Revert ".."

This reverts commit 41dbeb133fa133cf82a2724af1d7c5718a9ade4a.
Revert "CFQ: move think time check variables to a separate struct"

This reverts commit dff77e09e2386334e3f4a39cda9e58bd632b4181.
Revert "block: row: Fix starvation tolerance values"

This reverts commit 3a4e047531a9b14984c46bea3d1f68cfd7d4e4fd.
Revert "block: row: Update sysfs functions"

This reverts commit e8046086dbc0b28233a014a7043b506cb9ca4201.
Revert "block: row: Prevent starvation of regular priority by high priority"

This reverts commit f9f35128ff6adb5193ec6fd15c0ac3fb4fc9db4a.
Revert "block: row: Re-design urgent request notification mechanism"

This reverts commit 21c558f649ff14585eaa0bb25f8c7924798e4412.
Revert "block: add REQ_URGENT to request flags"

This reverts commit 19643751599e985e8db21d1ea148767e0b79b508.
Revert "block: urgent request: remove unnecessary urgent marking"

This reverts commit 4b35d5824b12fd0541cacab886afc1bc9d062550.
Revert "block: row: Update initial values of ROW data structures"

This reverts commit 1a5a96605f40b6b8f9ea72908438cde6e7c83877.
Revert "block: row: Don't notify URGENT if there are un-completed urgent req"

This reverts commit 137a214d759aaabeff5cf565080422b259949cf9.
Revert "block: row: Idling mechanism re-factoring"

This reverts commit c0a1be678b42b4663716850f4a8ceaf7417a2f6a.
Revert "block: row: Dispatch requests according to their io-priority"

This reverts commit cf7711b178fd16aaec804855dd2db4f512538e0a.
Revert "block: Add API for urgent request handling"

This reverts commit 13dcef197df65b79ee9afe1a41253124c2f84137.
Revert "block: Add support for reinsert a dispatched req"

This reverts commit 829cb2eaab153ae3bc85b5c4e34679d5cad63204.
Revert "block: blk-core: add printk_ratelimit"

This reverts commit c48c78ebf3f3b4354f3e8a5a3fccb71c6682f2b1.