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xt_quota2: allow incremental value to be written to quota proc file

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As well as writing absolute numeric values to the quota file, you
can now also write numbers preceded by a + sign or a - sign, e.g.

* "+30" would increase the quota by 30
* "+-20" would increase the quota by negative 20,
  which is the same as decrease by 20
* "-5" would decrease the quota by 5
This commit is contained in:
Sam Liddicott
2014-01-07 09:48:19 -08:00
committed by Jan Engelhardt
parent a4a077ff86
commit 939fc901c1
1 changed files with 24 additions and 4 deletions
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28
extensions/xt_quota2.c
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@@ -82,7 +82,7 @@ quota_proc_write(struct file *file, const char __user *input,
size_t size, loff_t *loff)
{
struct xt_quota_counter *e = PDE_DATA(file_inode(file));
char buf[sizeof("18446744073709551616")];
char buf[sizeof("+-18446744073709551616")];
if (size > sizeof(buf))
size = sizeof(buf);
@@ -92,9 +92,29 @@ quota_proc_write(struct file *file, const char __user *input,
if (size < sizeof(buf))
buf[size] = '\0';
spin_lock_bh(&e->lock);
e->quota = simple_strtoull(buf, NULL, 0);
spin_unlock_bh(&e->lock);
if (*buf == '+') {
int64_t temp = simple_strtoll(buf + 1, NULL, 0);
spin_lock_bh(&e->lock);
/* Do not let quota become negative if @tmp is very negative */
if (temp > 0 || -temp < e->quota)
e->quota += temp;
else
e->quota = 0;
spin_unlock_bh(&e->lock);
} else if (*buf == '-') {
int64_t temp = simple_strtoll(buf + 1, NULL, 0);
spin_lock_bh(&e->lock);
/* Do not let quota become negative if @tmp is very big */
if (temp < 0 || temp < e->quota)
e->quota -= temp;
else
e->quota = 0;
spin_unlock_bh(&e->lock);
} else {
spin_lock_bh(&e->lock);
e->quota = simple_strtoull(buf, NULL, 0);
spin_unlock_bh(&e->lock);
}
return size;
}