On Thu, 13 Dec 2007 17:17:30 +0100 Jerome Marchand wrote:
> This patch contain the core infrastructure of enhanced partition statistics.
> It adds to struct hd_struct the same stats data as struct gendisk and define basics function to manipulate them.
>
> Signed-off-by: Jerome Marchand <[email protected]>
> ---
> genhd.h | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 128 insertions(+), 1 deletion(-)
Please use "diffstat -p1 -w70" (Documentation/SubmittingPatches).
> diff -urNp -X linux-2.6/Documentation/dontdiff linux-2.6.orig/include/linux/genhd.h linux-2.6/include/linux/genhd.h
> --- linux-2.6.orig/include/linux/genhd.h 2007-12-05 12:17:42.000000000 +0100
> +++ linux-2.6/include/linux/genhd.h 2007-12-05 12:17:53.000000000 +0100
> @@ -91,6 +91,13 @@ struct hd_struct {
> #ifdef CONFIG_FAIL_MAKE_REQUEST
> int make_it_fail;
> #endif
> + unsigned long stamp;
> + int in_flight;
> +#ifdef CONFIG_SMP
> + struct disk_stats *dkstats;
> +#else
> + struct disk_stats dkstats;
> +#endif
> };
>
> #define GENHD_FL_REMOVABLE 1
> @@ -156,6 +163,19 @@ struct disk_attribute {
> * The __ variants should only be called in critical sections. The full
> * variants disable/enable preemption.
> */
> +static inline struct hd_struct *get_part(struct gendisk *gendiskp, sector_t sector)
> +{
> + struct hd_struct *part;
> + int i;
> + for (i=0; i < gendiskp->minors - 1; i++){
for (i = 0; i < gendiskp->minors - 1; i++) {
> + part = gendiskp->part[i];
> + if (part && part->start_sect <= sector
> + && sector <= part->start_sect + part->nr_sects)
I expect that the second comparison should just be <, not <=.
> + return part;
> + }
> + return NULL;
> +}
> +
> #ifdef CONFIG_SMP
> #define __disk_stat_add(gendiskp, field, addnd) \
> (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
> @@ -175,15 +195,60 @@ static inline void disk_stat_set_all(str
> memset(per_cpu_ptr(gendiskp->dkstats, i), value,
> sizeof (struct disk_stats));
> }
> +
> +#define __part_stat_add(part, field, addnd) \
> + (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
> +
> +#define __all_stat_add(gendiskp, field, addnd, sector) \
> +({ \
> + struct hd_struct *part = get_part(gendiskp, sector); \
> + if (part) __part_stat_add(part, field, addnd); \
if (part) \
__part_stat_add(part, field, addnd); \
> + __disk_stat_add(gendiskp, field, addnd); \
> +})
> +
> +#define part_stat_read(part, field) \
> +({ \
> + typeof(part->dkstats->field) res = 0; \
> + int i; \
> + for_each_possible_cpu(i) \
> + res += per_cpu_ptr(part->dkstats, i)->field; \
> + res; \
> +})
> +
> +static inline void part_stat_set_all(struct hd_struct *part, int value) {
> + int i;
> + for_each_possible_cpu(i)
> + memset(per_cpu_ptr(part->dkstats, i), value,
> + sizeof (struct disk_stats));
> +}
>
> #else
> #define __disk_stat_add(gendiskp, field, addnd) \
> (gendiskp->dkstats.field += addnd)
> #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
>
> -static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
> +static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
> +{
> memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
> }
> +
> +#define __part_stat_add(part, field, addnd) \
> + (part->dkstats.field += addnd)
> +
> +#define __all_stat_add(gendiskp, field, addnd, sector) \
> +({ \
> + struct hd_struct *part = get_part(gendiskp, sector); \
> + if (part) part->dkstats.field += addnd; \
if-condition + following statement on separate lines, please.
> + __disk_stat_add(gendiskp, field, addnd); \
> +})
> +
> +#define part_stat_read(part, field) (part->dkstats.field)
> +
> +static inline void part_stat_set_all(struct hd_struct *part, int value)
> +{
> + memset(&part->dkstats, value, sizeof (struct disk_stats));
> +}
> +
> #endif
>
> #define disk_stat_add(gendiskp, field, addnd) \
---
~Randy
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