From: "Zou, Nanhai" <nanhai.zou@intel.com>
I will need read and write unsigned long long value via sysctl interface in
my next patch.
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/include/linux/sysctl.h | 2
25-akpm/kernel/sysctl.c | 119 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 121 insertions(+)
diff -puN include/linux/sysctl.h~add-do_proc_doulonglongvec_minmax-to-sysctl-functions include/linux/sysctl.h
--- 25/include/linux/sysctl.h~add-do_proc_doulonglongvec_minmax-to-sysctl-functions 2004-11-03 20:25:44.437994480 -0800
+++ 25-akpm/include/linux/sysctl.h 2004-11-03 20:25:44.442993720 -0800
@@ -795,6 +795,8 @@ extern int proc_dointvec_userhz_jiffies(
void __user *, size_t *, loff_t *);
extern int proc_doulongvec_minmax(ctl_table *, int, struct file *,
void __user *, size_t *, loff_t *);
+extern int proc_doulonglongvec_minmax(ctl_table *, int, struct file *,
+ void __user *, size_t *, loff_t *);
extern int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int,
struct file *, void __user *, size_t *, loff_t *);
diff -puN kernel/sysctl.c~add-do_proc_doulonglongvec_minmax-to-sysctl-functions kernel/sysctl.c
--- 25/kernel/sysctl.c~add-do_proc_doulonglongvec_minmax-to-sysctl-functions 2004-11-03 20:25:44.439994176 -0800
+++ 25-akpm/kernel/sysctl.c 2004-11-03 20:25:44.445993264 -0800
@@ -1822,6 +1822,117 @@ int proc_doulongvec_minmax(ctl_table *ta
return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
}
+static int do_proc_doulonglongvec_minmax(ctl_table *table, int write,
+ struct file *filp,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos,
+ unsigned long long convmul,
+ unsigned long long convdiv)
+{
+#define TMPBUFLEN 21
+ unsigned long long *i, *min, *max, val;
+ int vleft, first=1, neg;
+ size_t len, left;
+ char buf[TMPBUFLEN], *p;
+ char __user *s = buffer;
+
+ if (!table->data || !table->maxlen || !*lenp ||
+ (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ i = (unsigned long long *) table->data;
+ min = (unsigned long long *) table->extra1;
+ max = (unsigned long long *) table->extra2;
+ vleft = table->maxlen / sizeof(unsigned long long);
+ left = *lenp;
+
+ for (; left && vleft--; i++, min++, max++, first=0) {
+ if (write) {
+ while (left) {
+ char c;
+ if (get_user(c, s))
+ return -EFAULT;
+ if (!isspace(c))
+ break;
+ left--;
+ s++;
+ }
+ if (!left)
+ break;
+ neg = 0;
+ len = left;
+ if (len > TMPBUFLEN-1)
+ len = TMPBUFLEN-1;
+ if (copy_from_user(buf, s, len))
+ return -EFAULT;
+ buf[len] = 0;
+ p = buf;
+ if (*p == '-' && left > 1) {
+ neg = 1;
+ left--, p++;
+ }
+ if (*p < '0' || *p > '9')
+ break;
+ val = simple_strtoull(p, &p, 0) * convmul / convdiv ;
+ len = p-buf;
+ if ((len < left) && *p && !isspace(*p))
+ break;
+ if (neg)
+ val = -val;
+ s += len;
+ left -= len;
+
+ if(neg)
+ continue;
+ if ((min && val < *min) || (max && val > *max))
+ continue;
+ *i = val;
+ } else {
+ p = buf;
+ if (!first)
+ *p++ = '\t';
+ sprintf(p, "%llu", convdiv * (*i) / convmul);
+ len = strlen(buf);
+ if (len > left)
+ len = left;
+ if(copy_to_user(s, buf, len))
+ return -EFAULT;
+ left -= len;
+ s += len;
+ }
+ }
+
+ if (!write && !first && left) {
+ if(put_user('\n', s))
+ return -EFAULT;
+ left--, s++;
+ }
+ if (write) {
+ while (left) {
+ char c;
+ if (get_user(c, s++))
+ return -EFAULT;
+ if (!isspace(c))
+ break;
+ left--;
+ }
+ }
+ if (write && first)
+ return -EINVAL;
+ *lenp -= left;
+ *ppos += *lenp;
+ return 0;
+#undef TMPBUFLEN
+}
+
+int proc_doulonglongvec_minmax(ctl_table *table, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_doulonglongvec_minmax(table, write, filp, buffer, lenp, ppos, 1LLU, 1LLU);
+}
+
/**
* proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
* @table: the sysctl table
@@ -1985,6 +2096,13 @@ int proc_doulongvec_minmax(ctl_table *ta
return -ENOSYS;
}
+int proc_doulonglongvec_minmax(ctl_table *table, int write,
+ struct file *filp,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
struct file *filp,
void __user *buffer,
@@ -2210,6 +2328,7 @@ EXPORT_SYMBOL(proc_dointvec_minmax);
EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
EXPORT_SYMBOL(proc_dostring);
EXPORT_SYMBOL(proc_doulongvec_minmax);
+EXPORT_SYMBOL(proc_doulonglongvec_minmax);
EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
EXPORT_SYMBOL(register_sysctl_table);
EXPORT_SYMBOL(sysctl_intvec);
_