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linux_dsm_epyc7002/net/can/proc.c
Alexey Dobriyan 96890d6252 net: delete /proc THIS_MODULE references 
/proc has been ignoring struct file_operations::owner field for 10 years.
Specifically, it started with commit 786d7e1612
("Fix rmmod/read/write races in /proc entries"). Notice the chunk where
inode->i_fop is initialized with proxy struct file_operations for
regular files:

	-               if (de->proc_fops)
	-                       inode->i_fop = de->proc_fops;
	+               if (de->proc_fops) {
	+                       if (S_ISREG(inode->i_mode))
	+                               inode->i_fop = &proc_reg_file_ops;
	+                       else
	+                               inode->i_fop = de->proc_fops;
	+               }

VFS stopped pinning module at this point.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-16 15:01:33 -05:00

581 lines
16 KiB
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/*
* proc.c - procfs support for Protocol family CAN core module
*
* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Volkswagen nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* The provided data structures and external interfaces from this code
* are not restricted to be used by modules with a GPL compatible license.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/if_arp.h>
#include <linux/can/core.h>
#include "af_can.h"
/*
* proc filenames for the PF_CAN core
*/
#define CAN_PROC_VERSION "version"
#define CAN_PROC_STATS "stats"
#define CAN_PROC_RESET_STATS "reset_stats"
#define CAN_PROC_RCVLIST_ALL "rcvlist_all"
#define CAN_PROC_RCVLIST_FIL "rcvlist_fil"
#define CAN_PROC_RCVLIST_INV "rcvlist_inv"
#define CAN_PROC_RCVLIST_SFF "rcvlist_sff"
#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
#define CAN_PROC_RCVLIST_ERR "rcvlist_err"
static int user_reset;
static const char rx_list_name[][8] = {
[RX_ERR] = "rx_err",
[RX_ALL] = "rx_all",
[RX_FIL] = "rx_fil",
[RX_INV] = "rx_inv",
};
/*
* af_can statistics stuff
*/
static void can_init_stats(struct net *net)
{
struct s_stats *can_stats = net->can.can_stats;
struct s_pstats *can_pstats = net->can.can_pstats;
/*
* This memset function is called from a timer context (when
* can_stattimer is active which is the default) OR in a process
* context (reading the proc_fs when can_stattimer is disabled).
*/
memset(can_stats, 0, sizeof(struct s_stats));
can_stats->jiffies_init = jiffies;
can_pstats->stats_reset++;
if (user_reset) {
user_reset = 0;
can_pstats->user_reset++;
}
}
static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
unsigned long count)
{
unsigned long rate;
if (oldjif == newjif)
return 0;
/* see can_stat_update() - this should NEVER happen! */
if (count > (ULONG_MAX / HZ)) {
printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
count);
return 99999999;
}
rate = (count * HZ) / (newjif - oldjif);
return rate;
}
void can_stat_update(struct timer_list *t)
{
struct net *net = from_timer(net, t, can.can_stattimer);
struct s_stats *can_stats = net->can.can_stats;
unsigned long j = jiffies; /* snapshot */
/* restart counting in timer context on user request */
if (user_reset)
can_init_stats(net);
/* restart counting on jiffies overflow */
if (j < can_stats->jiffies_init)
can_init_stats(net);
/* prevent overflow in calc_rate() */
if (can_stats->rx_frames > (ULONG_MAX / HZ))
can_init_stats(net);
/* prevent overflow in calc_rate() */
if (can_stats->tx_frames > (ULONG_MAX / HZ))
can_init_stats(net);
/* matches overflow - very improbable */
if (can_stats->matches > (ULONG_MAX / 100))
can_init_stats(net);
/* calc total values */
if (can_stats->rx_frames)
can_stats->total_rx_match_ratio = (can_stats->matches * 100) /
can_stats->rx_frames;
can_stats->total_tx_rate = calc_rate(can_stats->jiffies_init, j,
can_stats->tx_frames);
can_stats->total_rx_rate = calc_rate(can_stats->jiffies_init, j,
can_stats->rx_frames);
/* calc current values */
if (can_stats->rx_frames_delta)
can_stats->current_rx_match_ratio =
(can_stats->matches_delta * 100) /
can_stats->rx_frames_delta;
can_stats->current_tx_rate = calc_rate(0, HZ, can_stats->tx_frames_delta);
can_stats->current_rx_rate = calc_rate(0, HZ, can_stats->rx_frames_delta);
/* check / update maximum values */
if (can_stats->max_tx_rate < can_stats->current_tx_rate)
can_stats->max_tx_rate = can_stats->current_tx_rate;
if (can_stats->max_rx_rate < can_stats->current_rx_rate)
can_stats->max_rx_rate = can_stats->current_rx_rate;
if (can_stats->max_rx_match_ratio < can_stats->current_rx_match_ratio)
can_stats->max_rx_match_ratio = can_stats->current_rx_match_ratio;
/* clear values for 'current rate' calculation */
can_stats->tx_frames_delta = 0;
can_stats->rx_frames_delta = 0;
can_stats->matches_delta = 0;
/* restart timer (one second) */
mod_timer(&net->can.can_stattimer, round_jiffies(jiffies + HZ));
}
/*
* proc read functions
*/
static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
struct net_device *dev)
{
struct receiver *r;
hlist_for_each_entry_rcu(r, rx_list, list) {
char *fmt = (r->can_id & CAN_EFF_FLAG)?
" %-5s %08x %08x %pK %pK %8ld %s\n" :
" %-5s %03x %08x %pK %pK %8ld %s\n";
seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
r->func, r->data, r->matches, r->ident);
}
}
static void can_print_recv_banner(struct seq_file *m)
{
/*
* can1. 00000000 00000000 00000000
* ....... 0 tp20
*/
seq_puts(m, " device can_id can_mask function"
" userdata matches ident\n");
}
static int can_stats_proc_show(struct seq_file *m, void *v)
{
struct net *net = m->private;
struct s_stats *can_stats = net->can.can_stats;
struct s_pstats *can_pstats = net->can.can_pstats;
seq_putc(m, '\n');
seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats->tx_frames);
seq_printf(m, " %8ld received frames (RXF)\n", can_stats->rx_frames);
seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats->matches);
seq_putc(m, '\n');
if (net->can.can_stattimer.function == can_stat_update) {
seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
can_stats->total_rx_match_ratio);
seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
can_stats->total_tx_rate);
seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
can_stats->total_rx_rate);
seq_putc(m, '\n');
seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
can_stats->current_rx_match_ratio);
seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
can_stats->current_tx_rate);
seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
can_stats->current_rx_rate);
seq_putc(m, '\n');
seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
can_stats->max_rx_match_ratio);
seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
can_stats->max_tx_rate);
seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
can_stats->max_rx_rate);
seq_putc(m, '\n');
}
seq_printf(m, " %8ld current receive list entries (CRCV)\n",
can_pstats->rcv_entries);
seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
can_pstats->rcv_entries_max);
if (can_pstats->stats_reset)
seq_printf(m, "\n %8ld statistic resets (STR)\n",
can_pstats->stats_reset);
if (can_pstats->user_reset)
seq_printf(m, " %8ld user statistic resets (USTR)\n",
can_pstats->user_reset);
seq_putc(m, '\n');
return 0;
}
static int can_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_stats_proc_show);
}
static const struct file_operations can_stats_proc_fops = {
.open = can_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int can_reset_stats_proc_show(struct seq_file *m, void *v)
{
struct net *net = m->private;
struct s_pstats *can_pstats = net->can.can_pstats;
struct s_stats *can_stats = net->can.can_stats;
user_reset = 1;
if (net->can.can_stattimer.function == can_stat_update) {
seq_printf(m, "Scheduled statistic reset #%ld.\n",
can_pstats->stats_reset + 1);
} else {
if (can_stats->jiffies_init != jiffies)
can_init_stats(net);
seq_printf(m, "Performed statistic reset #%ld.\n",
can_pstats->stats_reset);
}
return 0;
}
static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_reset_stats_proc_show);
}
static const struct file_operations can_reset_stats_proc_fops = {
.open = can_reset_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int can_version_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%s\n", CAN_VERSION_STRING);
return 0;
}
static int can_version_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_version_proc_show);
}
static const struct file_operations can_version_proc_fops = {
.open = can_version_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
struct net_device *dev,
struct can_dev_rcv_lists *d)
{
if (!hlist_empty(&d->rx[idx])) {
can_print_recv_banner(m);
can_print_rcvlist(m, &d->rx[idx], dev);
} else
seq_printf(m, " (%s: no entry)\n", DNAME(dev));
}
static int can_rcvlist_proc_show(struct seq_file *m, void *v)
{
/* double cast to prevent GCC warning */
int idx = (int)(long)PDE_DATA(m->file->f_inode);
struct net_device *dev;
struct can_dev_rcv_lists *d;
struct net *net = m->private;
seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
rcu_read_lock();
/* receive list for 'all' CAN devices (dev == NULL) */
d = net->can.can_rx_alldev_list;
can_rcvlist_proc_show_one(m, idx, NULL, d);
/* receive list for registered CAN devices */
for_each_netdev_rcu(net, dev) {
if (dev->type == ARPHRD_CAN && dev->ml_priv)
can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
}
rcu_read_unlock();
seq_putc(m, '\n');
return 0;
}
static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_rcvlist_proc_show);
}
static const struct file_operations can_rcvlist_proc_fops = {
.open = can_rcvlist_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static inline void can_rcvlist_proc_show_array(struct seq_file *m,
struct net_device *dev,
struct hlist_head *rcv_array,
unsigned int rcv_array_sz)
{
unsigned int i;
int all_empty = 1;
/* check whether at least one list is non-empty */
for (i = 0; i < rcv_array_sz; i++)
if (!hlist_empty(&rcv_array[i])) {
all_empty = 0;
break;
}
if (!all_empty) {
can_print_recv_banner(m);
for (i = 0; i < rcv_array_sz; i++) {
if (!hlist_empty(&rcv_array[i]))
can_print_rcvlist(m, &rcv_array[i], dev);
}
} else
seq_printf(m, " (%s: no entry)\n", DNAME(dev));
}
static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
{
struct net_device *dev;
struct can_dev_rcv_lists *d;
struct net *net = m->private;
/* RX_SFF */
seq_puts(m, "\nreceive list 'rx_sff':\n");
rcu_read_lock();
/* sff receive list for 'all' CAN devices (dev == NULL) */
d = net->can.can_rx_alldev_list;
can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
/* sff receive list for registered CAN devices */
for_each_netdev_rcu(net, dev) {
if (dev->type == ARPHRD_CAN && dev->ml_priv) {
d = dev->ml_priv;
can_rcvlist_proc_show_array(m, dev, d->rx_sff,
ARRAY_SIZE(d->rx_sff));
}
}
rcu_read_unlock();
seq_putc(m, '\n');
return 0;
}
static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_rcvlist_sff_proc_show);
}
static const struct file_operations can_rcvlist_sff_proc_fops = {
.open = can_rcvlist_sff_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
{
struct net_device *dev;
struct can_dev_rcv_lists *d;
struct net *net = m->private;
/* RX_EFF */
seq_puts(m, "\nreceive list 'rx_eff':\n");
rcu_read_lock();
/* eff receive list for 'all' CAN devices (dev == NULL) */
d = net->can.can_rx_alldev_list;
can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
/* eff receive list for registered CAN devices */
for_each_netdev_rcu(net, dev) {
if (dev->type == ARPHRD_CAN && dev->ml_priv) {
d = dev->ml_priv;
can_rcvlist_proc_show_array(m, dev, d->rx_eff,
ARRAY_SIZE(d->rx_eff));
}
}
rcu_read_unlock();
seq_putc(m, '\n');
return 0;
}
static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_rcvlist_eff_proc_show);
}
static const struct file_operations can_rcvlist_eff_proc_fops = {
.open = can_rcvlist_eff_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/*
* can_init_proc - create main CAN proc directory and procfs entries
*/
void can_init_proc(struct net *net)
{
/* create /proc/net/can directory */
net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
if (!net->can.proc_dir) {
printk(KERN_INFO "can: failed to create /proc/net/can . "
"CONFIG_PROC_FS missing?\n");
return;
}
/* own procfs entries from the AF_CAN core */
net->can.pde_version = proc_create(CAN_PROC_VERSION, 0644,
net->can.proc_dir,
&can_version_proc_fops);
net->can.pde_stats = proc_create(CAN_PROC_STATS, 0644,
net->can.proc_dir,
&can_stats_proc_fops);
net->can.pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644,
net->can.proc_dir,
&can_reset_stats_proc_fops);
net->can.pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
(void *)RX_ERR);
net->can.pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
(void *)RX_ALL);
net->can.pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
(void *)RX_FIL);
net->can.pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
(void *)RX_INV);
net->can.pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644,
net->can.proc_dir,
&can_rcvlist_eff_proc_fops);
net->can.pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644,
net->can.proc_dir,
&can_rcvlist_sff_proc_fops);
}
/*
* can_remove_proc - remove procfs entries and main CAN proc directory
*/
void can_remove_proc(struct net *net)
{
if (net->can.pde_version)
remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
if (net->can.pde_stats)
remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
if (net->can.pde_reset_stats)
remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
if (net->can.pde_rcvlist_err)
remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
if (net->can.pde_rcvlist_all)
remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
if (net->can.pde_rcvlist_fil)
remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
if (net->can.pde_rcvlist_inv)
remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
if (net->can.pde_rcvlist_eff)
remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
if (net->can.pde_rcvlist_sff)
remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
if (net->can.proc_dir)
remove_proc_entry("can", net->proc_net);
}
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