readahead: remove the limit max_sectors_kb imposed on max_readahead_kb

Remove the size limit max_sectors_kb imposed on max_readahead_kb.

The size restriction is unreasonable.  Especially when max_sectors_kb cannot
grow larger than max_hw_sectors_kb, which can be rather small for some disk
drives.

Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 9 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index d875673e76cd..a83823fcd74f 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3928,7 +3928,6 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
                         max_hw_sectors_kb = q->max_hw_sectors >> 1,
                         page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
         ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
-        int ra_kb;
 
         if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
                 return -EINVAL;
@@ -3937,14 +3936,6 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
          * values synchronously:
          */
         spin_lock_irq(q->queue_lock);
-        /*
-         * Trim readahead window as well, if necessary:
-         */
-        ra_kb = q->backing_dev_info.ra_pages << (PAGE_CACHE_SHIFT - 10);
-        if (ra_kb > max_sectors_kb)
-                q->backing_dev_info.ra_pages =
-                                max_sectors_kb >> (PAGE_CACHE_SHIFT - 10);
-
         q->max_sectors = max_sectors_kb << 1;
         spin_unlock_irq(q->queue_lock);