[PATCH md 0 of 7] Introduction

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Following are 7 patches for md in 2.6.8-rc1-mm2

They all grew out of a desire to redo the locking in unplug_slave.
Getting and dropping a spinlock so often for very little gain (it
would be nearly impossible to lose the relevant race) really bothered
me.

I finally figured that I could reply it with rcu locking which is very
light wait, and quite up to the task.

One the way I found an number of inconsistencies that needed cleaning
up and even a few bugs to fix.
The first 6 patches deal with these inconsistencies and bugs.  The
last redoes the locking for adding/removing/accessing devices within
md personalities.


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