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block: fast-path for small and simple direct I/O requests
This patch adds a small and simple fast patch for small direct I/O requests on block devices that don't use AIO. Between the neat bio_iov_iter_get_pages helper that avoids allocating a page array for get_user_pages and the on-stack bio and biovec this avoid memory allocations and atomic operations entirely in the direct I/O code (lower levels might still do memory allocations and will usually have at least some atomic operations, though). Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Tested-By: Stephen Bates <[email protected]> Reviewed-By: Stephen Bates <[email protected]>
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