aio: separate out ring reservation from req allocation
commit 432c79978c33ecef91b1b04cea6936c20810da29 upstream. This is in preparation for certain types of IO not needing a ring reserveration. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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