Re: [patch] mm: xip/ext2 fix block allocation race

[Carsten Otte]

Nick Piggin wrote:
> XIP can call into get_xip_mem concurrently with the same file,offset with
> create=1.  This usually maps down to get_block, which expects the page lock
> to prevent such a situation. This causes ext2 to explode for one reason or
> another.
>
> Serialise those calls for the moment. For common usages today, I suspect
> get_xip_mem rarely is called to create new blocks. In future as XIP
> technologies evolve we might need to look at which operations require
> scalability, and rework the locking to suit.
>
> Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Acked-by: Carsten Otte <cotte@xxxxxxxxxx>
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