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quota2: reduce memory footprint for anonymous counters

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48/64 bytes (32/64-bit arch, resp.) per counter.
This commit is contained in:
Jan Engelhardt
2009-07-04 01:53:14 +02:00
parent 0a88bd3435
commit 4bf667d8eb
2 changed files with 17 additions and 8 deletions
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3
doc/changelog.txt
View File

@@ -1,7 +1,8 @@
- build: support for Linux 2.6.31-rc1
- quota2: support nameless counters
- quota2: support anonymous counters
- quota2: reduce memory footprint for anonymous counters
Xtables-addons 1.17 (June 16 2009)

22
extensions/xt_quota2.c
View File

@@ -21,6 +21,9 @@
#include "xt_quota2.h"
#include "compat_xtables.h"
/**
* @lock: lock to protect quota writers from each other
*/
struct xt_quota_counter {
u_int64_t quota;
spinlock_t lock;
@@ -72,19 +75,24 @@ static int quota_proc_write(struct file *file, const char __user *input,
}
static struct xt_quota_counter *
q2_new_counter(const struct xt_quota_mtinfo2 *q)
q2_new_counter(const struct xt_quota_mtinfo2 *q, bool anon)
{
struct xt_quota_counter *e;
unsigned int size;
e = kmalloc(sizeof(*e), GFP_KERNEL);
/* Do not need all the procfs things for anonymous counters. */
size = anon ? offsetof(typeof(*e), list) : sizeof(*e);
e = kmalloc(size, GFP_KERNEL);
if (e == NULL)
return NULL;
e->quota = q->quota;
spin_lock_init(&e->lock);
INIT_LIST_HEAD(&e->list);
atomic_set(&e->ref, 1);
strncpy(e->name, q->name, sizeof(e->name));
if (!anon) {
INIT_LIST_HEAD(&e->list);
atomic_set(&e->ref, 1);
strncpy(e->name, q->name, sizeof(e->name));
}
return e;
}
@@ -99,7 +107,7 @@ q2_get_counter(const struct xt_quota_mtinfo2 *q)
struct xt_quota_counter *e;
if (*q->name == '\0')
return q2_new_counter(q);
return q2_new_counter(q, true);
spin_lock_bh(&counter_list_lock);
list_for_each_entry(e, &counter_list, list)
@@ -109,7 +117,7 @@ q2_get_counter(const struct xt_quota_mtinfo2 *q)
return e;
}
e = q2_new_counter(q);
e = q2_new_counter(q, false);
if (e == NULL)
goto out;