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[PATCH] percpu counter data type changes to suppport more than 2**31 ext3 free blocks counter

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The percpu counter data type are changed in this set of patches to support
more users like ext3 who need more than 32 bit to store the free blocks
total in the filesystem.

- Generic perpcu counters data type changes.  The size of the global counter
  and local counter were explictly specified using s64 and s32.  The global
  counter is changed from long to s64, while the local counter is changed from
  long to s32, so we could avoid doing 64 bit update in most cases.

- Users of the percpu counters are updated to make use of the new
  percpu_counter_init() routine now taking an additional parameter to allow
  users to pass the initial value of the global counter.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mingming Cao
2006-06-23 02:05:41 -07:00
committed by Linus Torvalds
parent 3cbc564024
commit 0216bfcffe
5 changed files with 58 additions and 53 deletions
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10
lib/percpu_counter.c
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@@ -5,10 +5,10 @@
#include <linux/percpu_counter.h>
#include <linux/module.h>
void percpu_counter_mod(struct percpu_counter *fbc, long amount)
void percpu_counter_mod(struct percpu_counter *fbc, s32 amount)
{
long count;
long *pcount;
s32 *pcount;
int cpu = get_cpu();
pcount = per_cpu_ptr(fbc->counters, cpu);
@@ -29,15 +29,15 @@ EXPORT_SYMBOL(percpu_counter_mod);
* Add up all the per-cpu counts, return the result. This is a more accurate
* but much slower version of percpu_counter_read_positive()
*/
long percpu_counter_sum(struct percpu_counter *fbc)
s64 percpu_counter_sum(struct percpu_counter *fbc)
{
long ret;
s64 ret;
int cpu;
spin_lock(&fbc->lock);
ret = fbc->count;
for_each_possible_cpu(cpu) {
long *pcount = per_cpu_ptr(fbc->counters, cpu);
s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
ret += *pcount;
}
spin_unlock(&fbc->lock);