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[PATCH] ll_rw_blk: allow more flexibility for read_ahead_kb store

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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>
This commit is contained in:
Jens Axboe 2006-07-21 20:30:28 +02:00 committed by Jens Axboe
parent bf57225670
commit da20a20f3b
1 changed files with 0 additions and 3 deletions
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3
block/ll_rw_blk.c
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@ -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); ssize_t ret = queue_var_store(&ra_kb, page, count);
spin_lock_irq(q->queue_lock); 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); q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
spin_unlock_irq(q->queue_lock); spin_unlock_irq(q->queue_lock);