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sysctl: add proc_dointvec_ms_jiffies_minmax

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add proc_dointvec_ms_jiffies_minmax to fit read msecs value to jiffies
with a limited range of values

Signed-off-by: Yuwei Wang <wangyuweihx@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Yuwei Wang 2022-06-29 08:48:31 +00:00 committed by Paolo Abeni
parent d19b4c52f7
commit c381d02b2f
2 changed files with 43 additions and 0 deletions
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2
include/linux/sysctl.h
View file

@ -75,6 +75,8 @@ int proc_douintvec_minmax(struct ctl_table *table, int write, void *buffer,
int proc_dou8vec_minmax(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int proc_dointvec_jiffies(struct ctl_table *, int, void *, size_t *, loff_t *);
int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int proc_dointvec_userhz_jiffies(struct ctl_table *, int, void *, size_t *,
loff_t *);
int proc_dointvec_ms_jiffies(struct ctl_table *, int, void *, size_t *,

41
kernel/sysctl.c
View file

@ -1237,6 +1237,30 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
return 0;
}
static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
int *valp, int write, void *data)
{
int tmp, ret;
struct do_proc_dointvec_minmax_conv_param *param = data;
/*
* If writing, first do so via a temporary local int so we can
* bounds-check it before touching *valp.
*/
int *ip = write ? &tmp : valp;
ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
if (ret)
return ret;
if (write) {
if ((param->min && *param->min > tmp) ||
(param->max && *param->max < tmp))
return -EINVAL;
*valp = tmp;
}
return 0;
}
/**
* proc_dointvec_jiffies - read a vector of integers as seconds
* @table: the sysctl table
@ -1259,6 +1283,17 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
do_proc_dointvec_jiffies_conv,NULL);
}
int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct do_proc_dointvec_minmax_conv_param param = {
.min = (int *) table->extra1,
.max = (int *) table->extra2,
};
return do_proc_dointvec(table, write, buffer, lenp, ppos,
do_proc_dointvec_ms_jiffies_minmax_conv, &param);
}
/**
* proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
* @table: the sysctl table
@ -1523,6 +1558,12 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
return -ENOSYS;
}
int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
return -ENOSYS;
}
int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{