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Various AIO retry related fixes and enhancements

Suparna Bhattacharya lkml 1 version In review

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Cover letter [PATCH 0/3] Various AIO retry related fixes and enhancements

The following patches are a collection of various (mostly retry infrastructure related) fixes, cleanups and enhancements for AIO, that I have been maintaining for a while. I ran into most of them while implementing support for default high level retry methods (should also be helpful as a foundation for some network AIO work). Now that we have in-tree use of the retry logic, it makes sense to merge these fixes upstream. They are mostly localised to AIO code.

Note: The latter two patches involve policy oriented optimizations to the AIO workqueue usage, so I chose to separate them out.

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[1] aio-retry.patch
Collection of AIO retry infrastructure fixes and enhancements
AIO: Split iocb setup and execution in io_submit
(also fixes io_submit error reporting)
AIO: Default high level retry methods
AIO: Subtle use_mm/unuse_mm fix
AIO: Code commenting
AIO: Fix aio process hang on EINVAL (Daniel McNeil)
AIO: flush workqueues before destroying ioctx'es
AIO: hold the context lock across unuse_mm
AIO: Acquire task_lock in use_mm()
AIO: Allow fops to override the retry method with their own
AIO: Elevated ref count for AIO retries (Daniel McNeil)
AIO: set_fs needed when calling use_mm
AIO: flush workqueue on __put_ioctx (Chris Mason)
AIO: Fix io_cancel to work with retries (Chris Mason)
AIO: read-immediate option for socket/pipe retry support

[2] aio-splice-runlist.patch
AIO: Splice runlist to be fairer across multiple io contexts

[3] aio-context-switch.patch
AIO: Context switch reduction for retries (Chris Mason)
AIO: Fix IO stalls with context switch reduction changes
(Chris Mason)

Regards
Suparna

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Suparna Bhattacharya ([email protected])
Linux Technology Center
IBM Software Lab, India

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