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    Subject[PATCH 21/33] readahead: initial method - user recommended size
    backing_dev_info.ra_pages0 is a user configurable parameter that controls
    the readahead size on start-of-file.

    Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
    ---

    block/ll_rw_blk.c | 30 ++++++++++++++++++++++++++++++
    1 files changed, 30 insertions(+)

    --- linux-2.6.17-rc4-mm3.orig/block/ll_rw_blk.c
    +++ linux-2.6.17-rc4-mm3/block/ll_rw_blk.c
    @@ -3811,6 +3811,29 @@ queue_ra_store(struct request_queue *q,
    return ret;
    }

    +static ssize_t queue_initial_ra_show(struct request_queue *q, char *page)
    +{
    + int kb = q->backing_dev_info.ra_pages0 << (PAGE_CACHE_SHIFT - 10);
    +
    + return queue_var_show(kb, (page));
    +}
    +
    +static ssize_t
    +queue_initial_ra_store(struct request_queue *q, const char *page, size_t count)
    +{
    + unsigned long kb, ra;
    + ssize_t ret = queue_var_store(&kb, page, count);
    +
    + ra = kb >> (PAGE_CACHE_SHIFT - 10);
    + q->backing_dev_info.ra_pages0 = ra;
    +
    + ra = kb * 1024;
    + if (q->backing_dev_info.ra_expect_bytes > ra)
    + q->backing_dev_info.ra_expect_bytes = ra;
    +
    + return ret;
    +}
    +
    static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
    {
    int max_sectors_kb = q->max_sectors >> 1;
    @@ -3868,6 +3891,12 @@ static struct queue_sysfs_entry queue_ra
    .store = queue_ra_store,
    };

    +static struct queue_sysfs_entry queue_initial_ra_entry = {
    + .attr = {.name = "initial_ra_kb", .mode = S_IRUGO | S_IWUSR },
    + .show = queue_initial_ra_show,
    + .store = queue_initial_ra_store,
    +};
    +
    static struct queue_sysfs_entry queue_max_sectors_entry = {
    .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
    .show = queue_max_sectors_show,
    @@ -3888,6 +3917,7 @@ static struct queue_sysfs_entry queue_io
    static struct attribute *default_attrs[] = {
    &queue_requests_entry.attr,
    &queue_ra_entry.attr,
    + &queue_initial_ra_entry.attr,
    &queue_max_hw_sectors_entry.attr,
    &queue_max_sectors_entry.attr,
    &queue_iosched_entry.attr,
    --
    -
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