Re: [PATCH 04/33] aio: remove retry-based AIO

[Theodore Ts'o]

On Thu, Mar 21, 2013 at 09:35:25AM -0700, Kent Overstreet wrote:
> From: Zach Brown <zab@xxxxxxxxxx>
> 
> This removes the retry-based AIO infrastructure now that nothing in tree
> is using it.
> 
> We want to remove retry-based AIO because it is fundemantally unsafe.  It
> retries IO submission from a kernel thread that has only assumed the mm of
> the submitting task.  All other task_struct references in the IO
> submission path will see the kernel thread, not the submitting task.  This
> design flaw means that nothing of any meaningful complexity can use
> retry-based AIO.
> 
> This removes all the code and data associated with the retry machinery.
> The most significant benefit of this is the removal of the locking around
> the unused run list in the submission path.
> 
> This has only been compiled.
> 
> Signed-off-by: Kent Overstreet <koverstreet@xxxxxxxxxx>
> Signed-off-by: Zach Brown <zab@xxxxxxxxxx>

Reviewed-by: "Theodore Ts'o" <tytso@xxxxxxx>

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