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quota: Convert quota statistics to generic percpu_counter

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Generic per-cpu counter has some memory overhead but it is negligible for
modern systems and embedded systems compile without quota support.  And code
reuse is a good thing. This patch should fix complain from preemptive kernels
which was introduced by dde9588853.

[Jan Kara: Fixed patch to work on 32-bit archs as well]

Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Dmitry Monakhov 2010-05-26 23:21:58 +02:00 • committed by Jan Kara
parent 1513b02c8b
commit f32764bd2b
2 changed files with 17 additions and 45 deletions
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16
include/linux/quota.h
View file

@ -174,8 +174,7 @@ enum {
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/percpu_counter.h>
#include <linux/dqblk_xfs.h>
#include <linux/dqblk_v1.h>
@ -254,6 +253,7 @@ enum {
struct dqstats {
int stat[_DQST_DQSTAT_LAST];
struct percpu_counter counter[_DQST_DQSTAT_LAST];
};
extern struct dqstats *dqstats_pcpu;
@ -261,20 +261,12 @@ extern struct dqstats dqstats;
static inline void dqstats_inc(unsigned int type)
{
#ifdef CONFIG_SMP
per_cpu_ptr(dqstats_pcpu, smp_processor_id())->stat[type]++;
#else
dqstats.stat[type]++;
#endif
percpu_counter_inc(&dqstats.counter[type]);
}
static inline void dqstats_dec(unsigned int type)
{
#ifdef CONFIG_SMP
per_cpu_ptr(dqstats_pcpu, smp_processor_id())->stat[type]--;
#else
dqstats.stat[type]--;
#endif
percpu_counter_dec(&dqstats.counter[type]);
}
#define DQ_MOD_B 0 /* dquot modified since read */