[PATCH -next] sysctl: simplify ->strategy

From: Alexey Dobriyan
Date: Thu Aug 28 2008 - 01:00:47 EST

name and nlen parameters passed to ->strategy hook are unused, remove them.
In general ->strategy hook should know what it's doing, and don't do
something tricky for which, say, pointer to original userspace array may
be needed (name).

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

arch/frv/kernel/pm.c | 6 +++---
arch/mips/lasat/sysctl.c | 17 ++++++++---------
drivers/char/random.c | 2 +-
include/linux/sysctl.h | 2 +-
include/net/ip.h | 2 +-
include/net/ndisc.h | 5 ++---
ipc/ipc_sysctl.c | 9 ++++-----
kernel/sysctl.c | 29 +++++++++++++----------------
kernel/utsname_sysctl.c | 5 ++---
net/decnet/dn_dev.c | 4 ++--
net/decnet/sysctl_net_decnet.c | 4 ++--
net/ipv4/devinet.c | 7 +++----
net/ipv4/route.c | 7 +------
net/ipv4/sysctl_net_ipv4.c | 18 +++++++++---------
net/ipv6/addrconf.c | 1 -
net/ipv6/ndisc.c | 11 ++++-------
16 files changed, 56 insertions(+), 73 deletions(-)

--- a/arch/frv/kernel/pm.c
+++ b/arch/frv/kernel/pm.c
@@ -211,7 +211,7 @@ static int cmode_procctl(ctl_table *ctl, int write, struct file *filp,
return try_set_cmode(new_cmode)?:*lenp;
}

-static int cmode_sysctl(ctl_table *table, int __user *name, int nlen,
+static int cmode_sysctl(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -314,7 +314,7 @@ static int p0_procctl(ctl_table *ctl, int write, struct file *filp,
return try_set_p0(new_p0)?:*lenp;
}

-static int p0_sysctl(ctl_table *table, int __user *name, int nlen,
+static int p0_sysctl(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -358,7 +358,7 @@ static int cm_procctl(ctl_table *ctl, int write, struct file *filp,
return try_set_cm(new_cm)?:*lenp;
}

-static int cm_sysctl(ctl_table *table, int __user *name, int nlen,
+static int cm_sysctl(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
--- a/arch/mips/lasat/sysctl.c
+++ b/arch/mips/lasat/sysctl.c
@@ -38,14 +38,13 @@
#endif

/* Strategy function to write EEPROM after changing string entry */
-int sysctl_lasatstring(ctl_table *table, int *name, int nlen,
+int sysctl_lasatstring(ctl_table *table,
void *oldval, size_t *oldlenp,
void *newval, size_t newlen)
{
int r;

- r = sysctl_string(table, name,
- nlen, oldval, oldlenp, newval, newlen);
+ r = sysctl_string(table, oldval, oldlenp, newval, newlen);
if (r < 0)
return r;

@@ -113,13 +112,13 @@ int proc_dolasatrtc(ctl_table *table, int write, struct file *filp,
#endif

/* Sysctl for setting the IP addresses */
-int sysctl_lasat_intvec(ctl_table *table, int *name, int nlen,
+int sysctl_lasat_intvec(ctl_table *table,
void *oldval, size_t *oldlenp,
void *newval, size_t newlen)
{
int r;

- r = sysctl_intvec(table, name, nlen, oldval, oldlenp, newval, newlen);
+ r = sysctl_intvec(table, oldval, oldlenp, newval, newlen);
if (r < 0)
return r;

@@ -131,7 +130,7 @@ int sysctl_lasat_intvec(ctl_table *table, int *name, int nlen,

#ifdef CONFIG_DS1603
/* Same for RTC */
-int sysctl_lasat_rtc(ctl_table *table, int *name, int nlen,
+int sysctl_lasat_rtc(ctl_table *table,
void *oldval, size_t *oldlenp,
void *newval, size_t newlen)
{
@@ -140,7 +139,7 @@ int sysctl_lasat_rtc(ctl_table *table, int *name, int nlen,
rtctmp = read_persistent_clock();
if (rtctmp < 0)
rtctmp = 0;
- r = sysctl_intvec(table, name, nlen, oldval, oldlenp, newval, newlen);
+ r = sysctl_intvec(table, oldval, oldlenp, newval, newlen);
if (r < 0)
return r;
if (newval && newlen)
@@ -211,13 +210,13 @@ int proc_lasat_ip(ctl_table *table, int write, struct file *filp,
}
#endif

-static int sysctl_lasat_prid(ctl_table *table, int *name, int nlen,
+static int sysctl_lasat_prid(ctl_table *table,
void *oldval, size_t *oldlenp,
void *newval, size_t newlen)
{
int r;

- r = sysctl_intvec(table, name, nlen, oldval, oldlenp, newval, newlen);
+ r = sysctl_intvec(table, oldval, oldlenp, newval, newlen);
if (r < 0)
return r;
if (newval && newlen) {
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1266,7 +1266,7 @@ static int proc_do_uuid(ctl_table *table, int write, struct file *filp,
return proc_dostring(&fake_table, write, filp, buffer, lenp, ppos);
}

-static int uuid_strategy(ctl_table *table, int __user *name, int nlen,
+static int uuid_strategy(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -972,7 +972,7 @@ extern int sysctl_perm(struct ctl_table_root *root,

typedef struct ctl_table ctl_table;

-typedef int ctl_handler (struct ctl_table *table, int __user *name, int nlen,
+typedef int ctl_handler (struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen);

--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -383,7 +383,7 @@ extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
int ipv4_doint_and_flush(ctl_table *ctl, int write,
struct file* filp, void __user *buffer,
size_t *lenp, loff_t *ppos);
-int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
+int ipv4_doint_and_flush_strategy(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen);
#ifdef CONFIG_PROC_FS
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -129,9 +129,8 @@ extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
void __user *buffer,
size_t *lenp,
loff_t *ppos);
-int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
- int nlen, void __user *oldval,
- size_t __user *oldlenp,
+int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
+ void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen);
#endif

--- a/ipc/ipc_sysctl.c
+++ b/ipc/ipc_sysctl.c
@@ -131,7 +131,7 @@ static int proc_ipcauto_dointvec_minmax(ctl_table *table, int write,

#ifdef CONFIG_SYSCTL_SYSCALL
/* The generic sysctl ipc data routine. */
-static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
+static int sysctl_ipc_data(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -169,14 +169,13 @@ static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
return 1;
}

-static int sysctl_ipc_registered_data(ctl_table *table, int __user *name,
- int nlen, void __user *oldval, size_t __user *oldlenp,
+static int sysctl_ipc_registered_data(ctl_table *table,
+ void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
int rc;

- rc = sysctl_ipc_data(table, name, nlen, oldval, oldlenp, newval,
- newlen);
+ rc = sysctl_ipc_data(table, oldval, oldlenp, newval, newlen);

if (newval && newlen && rc > 0)
/*
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1545,7 +1545,6 @@ void register_sysctl_root(struct ctl_table_root *root)
/* Perform the actual read/write of a sysctl table entry. */
static int do_sysctl_strategy(struct ctl_table_root *root,
struct ctl_table *table,
- int __user *name, int nlen,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -1559,8 +1558,7 @@ static int do_sysctl_strategy(struct ctl_table_root *root,
return -EPERM;

if (table->strategy) {
- rc = table->strategy(table, name, nlen, oldval, oldlenp,
- newval, newlen);
+ rc = table->strategy(table, oldval, oldlenp, newval, newlen);
if (rc < 0)
return rc;
if (rc > 0)
@@ -1570,8 +1568,7 @@ static int do_sysctl_strategy(struct ctl_table_root *root,
/* If there is no strategy routine, or if the strategy returns
* zero, proceed with automatic r/w */
if (table->data && table->maxlen) {
- rc = sysctl_data(table, name, nlen, oldval, oldlenp,
- newval, newlen);
+ rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
if (rc < 0)
return rc;
}
@@ -1603,7 +1600,7 @@ repeat:
table = table->child;
goto repeat;
}
- error = do_sysctl_strategy(root, table, name, nlen,
+ error = do_sysctl_strategy(root, table,
oldval, oldlenp,
newval, newlen);
return error;
@@ -2762,7 +2759,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
*/

/* The generic sysctl data routine (used if no strategy routine supplied) */
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2796,7 +2793,7 @@ int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
}

/* The generic string strategy routine: */
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2842,7 +2839,7 @@ int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
* are between the minimum and maximum values given in the arrays
* table->extra1 and table->extra2, respectively.
*/
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2878,7 +2875,7 @@ int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
}

/* Strategy function to convert jiffies to seconds */
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2912,7 +2909,7 @@ int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
}

/* Strategy function to convert jiffies to seconds */
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2967,35 +2964,35 @@ asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
return error;
}

-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}

-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}

-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}

-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}

-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
--- a/kernel/utsname_sysctl.c
+++ b/kernel/utsname_sysctl.c
@@ -60,7 +60,7 @@ static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,

#ifdef CONFIG_SYSCTL_SYSCALL
/* The generic string strategy routine: */
-static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+static int sysctl_uts_string(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -69,8 +69,7 @@ static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
write = newval && newlen;
memcpy(&uts_table, table, sizeof(uts_table));
uts_table.data = get_uts(table, write);
- r = sysctl_string(&uts_table, name, nlen,
- oldval, oldlenp, newval, newlen);
+ r = sysctl_string(&uts_table, oldval, oldlenp, newval, newlen);
put_uts(table, write, uts_table.data);
return r;
}
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -166,7 +166,7 @@ static int max_priority[] = { 127 }; /* From DECnet spec */

static int dn_forwarding_proc(ctl_table *, int, struct file *,
void __user *, size_t *, loff_t *);
-static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
+static int dn_forwarding_sysctl(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen);

@@ -318,7 +318,7 @@ static int dn_forwarding_proc(ctl_table *table, int write,
#endif
}

-static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
+static int dn_forwarding_sysctl(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
--- a/net/decnet/sysctl_net_decnet.c
+++ b/net/decnet/sysctl_net_decnet.c
@@ -132,7 +132,7 @@ static int parse_addr(__le16 *addr, char *str)
}


-static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
+static int dn_node_address_strategy(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -217,7 +217,7 @@ static int dn_node_address_handler(ctl_table *table, int write,
}


-static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
+static int dn_def_dev_strategy(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1272,7 +1272,7 @@ static int devinet_conf_proc(ctl_table *ctl, int write,
return ret;
}

-static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
+static int devinet_conf_sysctl(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -1368,12 +1368,11 @@ int ipv4_doint_and_flush(ctl_table *ctl, int write,
return ret;
}

-int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
+int ipv4_doint_and_flush_strategy(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
- int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
- newval, newlen);
+ int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen);
struct net *net = table->extra2;

if (ret == 1)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2896,8 +2896,6 @@ static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write,
}

static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table,
- int __user *name,
- int nlen,
void __user *oldval,
size_t __user *oldlenp,
void __user *newval,
@@ -2960,16 +2958,13 @@ static int ipv4_sysctl_rt_secret_interval(ctl_table *ctl, int write,
}

static int ipv4_sysctl_rt_secret_interval_strategy(ctl_table *table,
- int __user *name,
- int nlen,
void __user *oldval,
size_t __user *oldlenp,
void __user *newval,
size_t newlen)
{
int old = ip_rt_secret_interval;
- int ret = sysctl_jiffies(table, name, nlen, oldval, oldlenp, newval,
- newlen);
+ int ret = sysctl_jiffies(table, oldval, oldlenp, newval, newlen);

rt_secret_reschedule(old);

--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -67,8 +67,8 @@ static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
}

/* Validate changes from sysctl interface. */
-static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
- int nlen, void __user *oldval,
+static int ipv4_sysctl_local_port_range(ctl_table *table,
+ void __user *oldval,
size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -83,7 +83,7 @@ static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
.extra2 = &ip_local_port_range_max,
};

- ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
+ ret = sysctl_intvec(&tmp, oldval, oldlenp, newval, newlen);
if (ret == 0 && newval && newlen) {
if (range[1] < range[0])
ret = -EINVAL;
@@ -112,8 +112,8 @@ static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file *
return ret;
}

-static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
- int nlen, void __user *oldval,
+static int sysctl_tcp_congestion_control(ctl_table *table,
+ void __user *oldval,
size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -125,7 +125,7 @@ static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
int ret;

tcp_get_default_congestion_control(val);
- ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
+ ret = sysctl_string(&tbl, oldval, oldlenp, newval, newlen);
if (ret == 1 && newval && newlen)
ret = tcp_set_default_congestion_control(val);
return ret;
@@ -168,8 +168,8 @@ static int proc_allowed_congestion_control(ctl_table *ctl,
return ret;
}

-static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
- int nlen, void __user *oldval,
+static int strategy_allowed_congestion_control(ctl_table *table,
+ void __user *oldval,
size_t __user *oldlenp,
void __user *newval,
size_t newlen)
@@ -182,7 +182,7 @@ static int strategy_allowed_congestion_control(ctl_table *table, int __user *nam
return -ENOMEM;

tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
- ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
+ ret = sysctl_string(&tbl, oldval, oldlenp, newval, newlen);
if (ret == 1 && newval && newlen)
ret = tcp_set_allowed_congestion_control(tbl.data);
kfree(tbl.data);
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3982,7 +3982,6 @@ int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
}

static int addrconf_sysctl_forward_strategy(ctl_table *table,
- int __user *name, int nlen,
void __user *oldval,
size_t __user *oldlenp,
void __user *newval, size_t newlen)
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1730,9 +1730,8 @@ int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * f
return ret;
}

-int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
- int nlen, void __user *oldval,
- size_t __user *oldlenp,
+int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
+ void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
struct net_device *dev = ctl->extra1;
@@ -1745,13 +1744,11 @@ int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,

switch (ctl->ctl_name) {
case NET_NEIGH_REACHABLE_TIME:
- ret = sysctl_jiffies(ctl, name, nlen,
- oldval, oldlenp, newval, newlen);
+ ret = sysctl_jiffies(ctl, oldval, oldlenp, newval, newlen);
break;
case NET_NEIGH_RETRANS_TIME_MS:
case NET_NEIGH_REACHABLE_TIME_MS:
- ret = sysctl_ms_jiffies(ctl, name, nlen,
- oldval, oldlenp, newval, newlen);
+ ret = sysctl_ms_jiffies(ctl, oldval, oldlenp, newval, newlen);
break;
default:
ret = 0;

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