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    Subject[PATCH][cfq-cgroups][12/12] Interface for parameter of cfq driver data
    Date
    From 8bdb6a318fbc266cf359aea699c97a964baeff35 Mon Sep 17 00:00:00 2001
    From: Satoshi UCHIDA <s-uchida@ap.jp.nec.com>
    Date: Fri, 31 Oct 2008 20:49:57 +0900
    Subject: [PATCH][cfq-cgroups] Interface for parameter of cfq driver data

    This patch add a interface for parameter of cfq driver data.


    Signed-off-by: Satoshi UCHIDA <s-uchida@ap.jp.nec.com>

    ---
    block/cfq-cgroup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++-
    1 files changed, 58 insertions(+), 1 deletions(-)

    diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c
    index 4938fa0..776874d 100644
    --- a/block/cfq-cgroup.c
    +++ b/block/cfq-cgroup.c
    @@ -1028,6 +1028,62 @@ STORE_FUNCTION(cfq_cgroup_slice_async_rq_store, cfq_slice_async_rq, 1,
    STORE_FUNCTION(cfq_cgroup_ioprio_store, ioprio, 0, CFQ_CGROUP_MAX_IOPRIO, 0);
    #undef STORE_FUNCTION

    +static ssize_t
    +cfq_cgroup_var_show2(unsigned int var, char *page)
    +{
    + return snprintf(page, PAGE_SIZE, "%d\n", var);
    +}
    +
    +static ssize_t
    +cfq_cgroup_var_store2(unsigned int *var, const char *page, size_t count)
    +{
    + int err;
    + char *p = (char *) page;
    + unsigned long new_var;
    +
    + err = strict_strtoul(p, 10, &new_var);
    + if (err)
    + count = 0;
    +
    + *var = new_var;
    +
    + return count;
    +}
    +
    +#define SHOW_FUNCTION2(__FUNC, __VAR, __CONV) \
    +static ssize_t __FUNC(elevator_t *e, char *page) \
    +{ \
    + struct cfq_data *cfqd = e->elevator_data; \
    + struct cfq_driver_data *cfqdd = cfqd->cfqdd; \
    + unsigned int __data = __VAR; \
    + if (__CONV) \
    + __data = jiffies_to_msecs(__data); \
    + return cfq_cgroup_var_show2(__data, (page)); \
    +}
    +SHOW_FUNCTION2(cfq_cgroup_slice_cgroup_show, cfqdd->cfq_cgroup_slice, 1);
    +#undef SHOW_FUNCTION2
    +
    +#define STORE_FUNCTION2(__FUNC, __PTR, MIN, MAX, __CONV) \
    +static ssize_t __FUNC(elevator_t *e, const char *page, size_t count) \
    +{ \
    + struct cfq_data *cfqd = e->elevator_data; \
    + struct cfq_driver_data *cfqdd = cfqd->cfqdd; \
    + unsigned int __data; \
    + int ret = cfq_cgroup_var_store2(&__data, (page), count); \
    + if (__data < (MIN)) \
    + __data = (MIN); \
    + else if (__data > (MAX)) \
    + __data = (MAX); \
    + if (__CONV) \
    + *(__PTR) = msecs_to_jiffies(__data); \
    + else \
    + *(__PTR) = __data; \
    + return ret; \
    +}
    +STORE_FUNCTION2(cfq_cgroup_slice_cgroup_store, &cfqdd->cfq_cgroup_slice, 1,
    + UINT_MAX, 1);
    +#undef STORE_FUNCTION2
    +
    #define CFQ_CGROUP_ATTR(name) \
    __ATTR(name, S_IRUGO|S_IWUSR, cfq_cgroup_##name##_show, \
    cfq_cgroup_##name##_store)
    @@ -1043,6 +1099,7 @@ static struct elv_fs_entry cfq_cgroup_attrs[] = {
    CFQ_CGROUP_ATTR(slice_async_rq),
    CFQ_CGROUP_ATTR(slice_idle),
    CFQ_CGROUP_ATTR(ioprio),
    + CFQ_CGROUP_ATTR(slice_cgroup),
    __ATTR_NULL
    };

    --
    1.5.6.5



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