Commit da20a20f authored Jul 21, 2006 by Jens Axboe Committed by Jens Axboe Sep 30, 2006

[PATCH] ll_rw_blk: allow more flexibility for read_ahead_kb store



It can make sense to set read-ahead larger than a single request.
We should not be enforcing such policy on the user. Additionally,
using the BLKRASET ioctl doesn't impose such a restriction. So
additionally we now expose identical behaviour through the two.

Issue also reported by Anton <cbou@mail.ru>

Signed-off-by: Jens Axboe <axboe@suse.de>

parent bf572256

block/ll_rw_blk.c

+0 −3

Original line number	Diff line number	Diff line
		@@ -3806,9 +3806,6 @@ queue_ra_store(struct request_queue q, const char page, size_t count)
		ssize_t ret = queue_var_store(&ra_kb, page, count);

		spin_lock_irq(q->queue_lock);
		if (ra_kb > (q->max_sectors >> 1))
		ra_kb = (q->max_sectors >> 1);

		q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
		spin_unlock_irq(q->queue_lock);