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![Arjan van de Ven](/assets/img/avatar_default.png)
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
353 lines
7.5 KiB
C
353 lines
7.5 KiB
C
/*
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* X.25 Packet Layer release 002
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*
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* This is ALPHA test software. This code may break your machine,
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* randomly fail to work with new releases, misbehave and/or generally
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* screw up. It might even work.
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*
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* This code REQUIRES 2.4 with seq_file support
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* History
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* 2002/10/06 Arnaldo Carvalho de Melo seq_file support
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*/
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/sock.h>
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#include <net/x25.h>
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#ifdef CONFIG_PROC_FS
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static __inline__ struct x25_route *x25_get_route_idx(loff_t pos)
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{
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struct list_head *route_entry;
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struct x25_route *rt = NULL;
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list_for_each(route_entry, &x25_route_list) {
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rt = list_entry(route_entry, struct x25_route, node);
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if (!pos--)
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goto found;
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}
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rt = NULL;
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found:
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return rt;
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}
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static void *x25_seq_route_start(struct seq_file *seq, loff_t *pos)
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{
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loff_t l = *pos;
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read_lock_bh(&x25_route_list_lock);
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return l ? x25_get_route_idx(--l) : SEQ_START_TOKEN;
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}
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static void *x25_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct x25_route *rt;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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rt = NULL;
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if (!list_empty(&x25_route_list))
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rt = list_entry(x25_route_list.next,
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struct x25_route, node);
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goto out;
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}
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rt = v;
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if (rt->node.next != &x25_route_list)
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rt = list_entry(rt->node.next, struct x25_route, node);
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else
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rt = NULL;
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out:
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return rt;
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}
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static void x25_seq_route_stop(struct seq_file *seq, void *v)
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{
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read_unlock_bh(&x25_route_list_lock);
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}
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static int x25_seq_route_show(struct seq_file *seq, void *v)
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{
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struct x25_route *rt;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "Address Digits Device\n");
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goto out;
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}
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rt = v;
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seq_printf(seq, "%-15s %-6d %-5s\n",
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rt->address.x25_addr, rt->sigdigits,
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rt->dev ? rt->dev->name : "???");
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out:
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return 0;
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}
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static __inline__ struct sock *x25_get_socket_idx(loff_t pos)
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{
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struct sock *s;
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struct hlist_node *node;
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sk_for_each(s, node, &x25_list)
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if (!pos--)
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goto found;
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s = NULL;
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found:
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return s;
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}
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static void *x25_seq_socket_start(struct seq_file *seq, loff_t *pos)
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{
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loff_t l = *pos;
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read_lock_bh(&x25_list_lock);
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return l ? x25_get_socket_idx(--l) : SEQ_START_TOKEN;
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}
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static void *x25_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct sock *s;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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s = sk_head(&x25_list);
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goto out;
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}
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s = sk_next(v);
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out:
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return s;
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}
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static void x25_seq_socket_stop(struct seq_file *seq, void *v)
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{
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read_unlock_bh(&x25_list_lock);
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}
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static int x25_seq_socket_show(struct seq_file *seq, void *v)
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{
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struct sock *s;
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struct x25_sock *x25;
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struct net_device *dev;
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const char *devname;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "dest_addr src_addr dev lci st vs vr "
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"va t t2 t21 t22 t23 Snd-Q Rcv-Q inode\n");
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goto out;
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}
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s = v;
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x25 = x25_sk(s);
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if (!x25->neighbour || (dev = x25->neighbour->dev) == NULL)
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devname = "???";
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else
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devname = x25->neighbour->dev->name;
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seq_printf(seq, "%-10s %-10s %-5s %3.3X %d %d %d %d %3lu %3lu "
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"%3lu %3lu %3lu %5d %5d %ld\n",
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!x25->dest_addr.x25_addr[0] ? "*" : x25->dest_addr.x25_addr,
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!x25->source_addr.x25_addr[0] ? "*" : x25->source_addr.x25_addr,
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devname, x25->lci & 0x0FFF, x25->state, x25->vs, x25->vr,
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x25->va, x25_display_timer(s) / HZ, x25->t2 / HZ,
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x25->t21 / HZ, x25->t22 / HZ, x25->t23 / HZ,
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atomic_read(&s->sk_wmem_alloc),
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atomic_read(&s->sk_rmem_alloc),
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s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
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out:
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return 0;
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}
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static __inline__ struct x25_forward *x25_get_forward_idx(loff_t pos)
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{
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struct x25_forward *f;
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struct list_head *entry;
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list_for_each(entry, &x25_forward_list) {
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f = list_entry(entry, struct x25_forward, node);
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if (!pos--)
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goto found;
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}
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f = NULL;
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found:
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return f;
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}
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static void *x25_seq_forward_start(struct seq_file *seq, loff_t *pos)
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{
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loff_t l = *pos;
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read_lock_bh(&x25_forward_list_lock);
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return l ? x25_get_forward_idx(--l) : SEQ_START_TOKEN;
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}
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static void *x25_seq_forward_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct x25_forward *f;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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f = NULL;
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if (!list_empty(&x25_forward_list))
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f = list_entry(x25_forward_list.next,
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struct x25_forward, node);
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goto out;
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}
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f = v;
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if (f->node.next != &x25_forward_list)
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f = list_entry(f->node.next, struct x25_forward, node);
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else
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f = NULL;
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out:
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return f;
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}
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static void x25_seq_forward_stop(struct seq_file *seq, void *v)
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{
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read_unlock_bh(&x25_forward_list_lock);
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}
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static int x25_seq_forward_show(struct seq_file *seq, void *v)
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{
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struct x25_forward *f;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "lci dev1 dev2\n");
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goto out;
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}
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f = v;
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seq_printf(seq, "%d %-10s %-10s\n",
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f->lci, f->dev1->name, f->dev2->name);
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out:
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return 0;
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}
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static struct seq_operations x25_seq_route_ops = {
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.start = x25_seq_route_start,
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.next = x25_seq_route_next,
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.stop = x25_seq_route_stop,
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.show = x25_seq_route_show,
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};
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static struct seq_operations x25_seq_socket_ops = {
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.start = x25_seq_socket_start,
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.next = x25_seq_socket_next,
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.stop = x25_seq_socket_stop,
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.show = x25_seq_socket_show,
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};
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static struct seq_operations x25_seq_forward_ops = {
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.start = x25_seq_forward_start,
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.next = x25_seq_forward_next,
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.stop = x25_seq_forward_stop,
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.show = x25_seq_forward_show,
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};
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static int x25_seq_socket_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &x25_seq_socket_ops);
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}
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static int x25_seq_route_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &x25_seq_route_ops);
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}
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static int x25_seq_forward_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &x25_seq_forward_ops);
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}
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static const struct file_operations x25_seq_socket_fops = {
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.owner = THIS_MODULE,
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.open = x25_seq_socket_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static const struct file_operations x25_seq_route_fops = {
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.owner = THIS_MODULE,
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.open = x25_seq_route_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static struct file_operations x25_seq_forward_fops = {
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.owner = THIS_MODULE,
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.open = x25_seq_forward_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static struct proc_dir_entry *x25_proc_dir;
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int __init x25_proc_init(void)
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{
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struct proc_dir_entry *p;
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int rc = -ENOMEM;
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x25_proc_dir = proc_mkdir("x25", proc_net);
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if (!x25_proc_dir)
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goto out;
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p = create_proc_entry("route", S_IRUGO, x25_proc_dir);
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if (!p)
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goto out_route;
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p->proc_fops = &x25_seq_route_fops;
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p = create_proc_entry("socket", S_IRUGO, x25_proc_dir);
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if (!p)
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goto out_socket;
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p->proc_fops = &x25_seq_socket_fops;
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p = create_proc_entry("forward", S_IRUGO, x25_proc_dir);
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if (!p)
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goto out_forward;
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p->proc_fops = &x25_seq_forward_fops;
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rc = 0;
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out:
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return rc;
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out_forward:
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remove_proc_entry("socket", x25_proc_dir);
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out_socket:
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remove_proc_entry("route", x25_proc_dir);
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out_route:
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remove_proc_entry("x25", proc_net);
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goto out;
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}
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void __exit x25_proc_exit(void)
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{
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remove_proc_entry("forward", x25_proc_dir);
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remove_proc_entry("route", x25_proc_dir);
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remove_proc_entry("socket", x25_proc_dir);
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remove_proc_entry("x25", proc_net);
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}
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#else /* CONFIG_PROC_FS */
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int __init x25_proc_init(void)
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{
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return 0;
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}
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void __exit x25_proc_exit(void)
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{
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}
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#endif /* CONFIG_PROC_FS */
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