Blackfin SPI Driver: tweak magic spi dma sequence to get it working on BF54x
[linux-2.6/mini2440.git] / fs / proc / proc_net.c
blob04d1270f1c38687da3e925ef395e73dfcdd79022
1 /*
2 * linux/fs/proc/net.c
4 * Copyright (C) 2007
6 * Author: Eric Biederman <ebiederm@xmission.com>
8 * proc net directory handling functions
9 */
11 #include <asm/uaccess.h>
13 #include <linux/errno.h>
14 #include <linux/time.h>
15 #include <linux/proc_fs.h>
16 #include <linux/stat.h>
17 #include <linux/init.h>
18 #include <linux/sched.h>
19 #include <linux/module.h>
20 #include <linux/bitops.h>
21 #include <linux/mount.h>
22 #include <linux/nsproxy.h>
23 #include <net/net_namespace.h>
24 #include <linux/seq_file.h>
26 #include "internal.h"
29 static struct net *get_proc_net(const struct inode *inode)
31 return maybe_get_net(PDE_NET(PDE(inode)));
34 int seq_open_net(struct inode *ino, struct file *f,
35 const struct seq_operations *ops, int size)
37 struct net *net;
38 struct seq_net_private *p;
40 BUG_ON(size < sizeof(*p));
42 net = get_proc_net(ino);
43 if (net == NULL)
44 return -ENXIO;
46 p = __seq_open_private(f, ops, size);
47 if (p == NULL) {
48 put_net(net);
49 return -ENOMEM;
51 #ifdef CONFIG_NET_NS
52 p->net = net;
53 #endif
54 return 0;
56 EXPORT_SYMBOL_GPL(seq_open_net);
58 int single_open_net(struct inode *inode, struct file *file,
59 int (*show)(struct seq_file *, void *))
61 int err;
62 struct net *net;
64 err = -ENXIO;
65 net = get_proc_net(inode);
66 if (net == NULL)
67 goto err_net;
69 err = single_open(file, show, net);
70 if (err < 0)
71 goto err_open;
73 return 0;
75 err_open:
76 put_net(net);
77 err_net:
78 return err;
80 EXPORT_SYMBOL_GPL(single_open_net);
82 int seq_release_net(struct inode *ino, struct file *f)
84 struct seq_file *seq;
86 seq = f->private_data;
88 put_net(seq_file_net(seq));
89 seq_release_private(ino, f);
90 return 0;
92 EXPORT_SYMBOL_GPL(seq_release_net);
94 int single_release_net(struct inode *ino, struct file *f)
96 struct seq_file *seq = f->private_data;
97 put_net(seq->private);
98 return single_release(ino, f);
100 EXPORT_SYMBOL_GPL(single_release_net);
102 static struct net *get_proc_task_net(struct inode *dir)
104 struct task_struct *task;
105 struct nsproxy *ns;
106 struct net *net = NULL;
108 rcu_read_lock();
109 task = pid_task(proc_pid(dir), PIDTYPE_PID);
110 if (task != NULL) {
111 ns = task_nsproxy(task);
112 if (ns != NULL)
113 net = get_net(ns->net_ns);
115 rcu_read_unlock();
117 return net;
120 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
121 struct dentry *dentry, struct nameidata *nd)
123 struct dentry *de;
124 struct net *net;
126 de = ERR_PTR(-ENOENT);
127 net = get_proc_task_net(dir);
128 if (net != NULL) {
129 de = proc_lookup_de(net->proc_net, dir, dentry);
130 put_net(net);
132 return de;
135 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
136 struct kstat *stat)
138 struct inode *inode = dentry->d_inode;
139 struct net *net;
141 net = get_proc_task_net(inode);
143 generic_fillattr(inode, stat);
145 if (net != NULL) {
146 stat->nlink = net->proc_net->nlink;
147 put_net(net);
150 return 0;
153 const struct inode_operations proc_net_inode_operations = {
154 .lookup = proc_tgid_net_lookup,
155 .getattr = proc_tgid_net_getattr,
158 static int proc_tgid_net_readdir(struct file *filp, void *dirent,
159 filldir_t filldir)
161 int ret;
162 struct net *net;
164 ret = -EINVAL;
165 net = get_proc_task_net(filp->f_path.dentry->d_inode);
166 if (net != NULL) {
167 ret = proc_readdir_de(net->proc_net, filp, dirent, filldir);
168 put_net(net);
170 return ret;
173 const struct file_operations proc_net_operations = {
174 .llseek = generic_file_llseek,
175 .read = generic_read_dir,
176 .readdir = proc_tgid_net_readdir,
180 struct proc_dir_entry *proc_net_fops_create(struct net *net,
181 const char *name, mode_t mode, const struct file_operations *fops)
183 return proc_create(name, mode, net->proc_net, fops);
185 EXPORT_SYMBOL_GPL(proc_net_fops_create);
187 void proc_net_remove(struct net *net, const char *name)
189 remove_proc_entry(name, net->proc_net);
191 EXPORT_SYMBOL_GPL(proc_net_remove);
193 static __net_init int proc_net_ns_init(struct net *net)
195 struct proc_dir_entry *netd, *net_statd;
196 int err;
198 err = -ENOMEM;
199 netd = kzalloc(sizeof(*netd), GFP_KERNEL);
200 if (!netd)
201 goto out;
203 netd->data = net;
204 netd->nlink = 2;
205 netd->name = "net";
206 netd->namelen = 3;
207 netd->parent = &proc_root;
209 err = -EEXIST;
210 net_statd = proc_net_mkdir(net, "stat", netd);
211 if (!net_statd)
212 goto free_net;
214 net->proc_net = netd;
215 net->proc_net_stat = net_statd;
216 return 0;
218 free_net:
219 kfree(netd);
220 out:
221 return err;
224 static __net_exit void proc_net_ns_exit(struct net *net)
226 remove_proc_entry("stat", net->proc_net);
227 kfree(net->proc_net);
230 static struct pernet_operations __net_initdata proc_net_ns_ops = {
231 .init = proc_net_ns_init,
232 .exit = proc_net_ns_exit,
235 int __init proc_net_init(void)
237 proc_symlink("net", NULL, "self/net");
239 return register_pernet_subsys(&proc_net_ns_ops);