On Tuesday January 23, [EMAIL PROTECTED] wrote:
> 
> My question is then : what prevents the upper layer to open the array
> read-write, submit a write and make the md code BUG_ON() ?

The theory is that when you tell an md array to become read-only, it
tells the block layer that it is read-only, and then if some process
tries to open it read/write, it gets an array.

I say "theory" because I have never really tested any of the read-only
stuff.  I have had a feeling for a long time that it really needs a
bit of thought and testing and documentation, but it never quite
seemed important enough to get that love-and-care....

NeilBrown
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