163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
/*
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* linux/fs/proc/root.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* proc root directory handling functions
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*/
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#include <asm/uaccess.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/smp_lock.h>
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#include "internal.h"
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struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
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#ifdef CONFIG_SYSCTL
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struct proc_dir_entry *proc_sys_root;
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#endif
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static struct super_block *proc_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return get_sb_single(fs_type, flags, data, proc_fill_super);
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}
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static struct file_system_type proc_fs_type = {
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.name = "proc",
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.get_sb = proc_get_sb,
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.kill_sb = kill_anon_super,
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};
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void __init proc_root_init(void)
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{
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int err = proc_init_inodecache();
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if (err)
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return;
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err = register_filesystem(&proc_fs_type);
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if (err)
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return;
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proc_mnt = kern_mount(&proc_fs_type);
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err = PTR_ERR(proc_mnt);
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if (IS_ERR(proc_mnt)) {
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unregister_filesystem(&proc_fs_type);
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return;
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}
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proc_misc_init();
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proc_net = proc_mkdir("net", NULL);
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proc_net_stat = proc_mkdir("net/stat", NULL);
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#ifdef CONFIG_SYSVIPC
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proc_mkdir("sysvipc", NULL);
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#endif
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#ifdef CONFIG_SYSCTL
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proc_sys_root = proc_mkdir("sys", NULL);
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#endif
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#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
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proc_mkdir("sys/fs", NULL);
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proc_mkdir("sys/fs/binfmt_misc", NULL);
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#endif
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proc_root_fs = proc_mkdir("fs", NULL);
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proc_root_driver = proc_mkdir("driver", NULL);
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proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
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#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
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/* just give it a mountpoint */
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proc_mkdir("openprom", NULL);
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#endif
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proc_tty_init();
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#ifdef CONFIG_PROC_DEVICETREE
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proc_device_tree_init();
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#endif
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proc_bus = proc_mkdir("bus", NULL);
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}
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static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
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{
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/*
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* nr_threads is actually protected by the tasklist_lock;
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* however, it's conventional to do reads, especially for
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* reporting, without any locking whatsoever.
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*/
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if (dir->i_ino == PROC_ROOT_INO) /* check for safety... */
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dir->i_nlink = proc_root.nlink + nr_threads;
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if (!proc_lookup(dir, dentry, nd)) {
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return NULL;
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}
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return proc_pid_lookup(dir, dentry, nd);
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}
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static int proc_root_readdir(struct file * filp,
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void * dirent, filldir_t filldir)
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{
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unsigned int nr = filp->f_pos;
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int ret;
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lock_kernel();
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if (nr < FIRST_PROCESS_ENTRY) {
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int error = proc_readdir(filp, dirent, filldir);
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if (error <= 0) {
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unlock_kernel();
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return error;
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}
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filp->f_pos = FIRST_PROCESS_ENTRY;
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}
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unlock_kernel();
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ret = proc_pid_readdir(filp, dirent, filldir);
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return ret;
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}
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/*
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* The root /proc directory is special, as it has the
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* <pid> directories. Thus we don't use the generic
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* directory handling functions for that..
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*/
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static struct file_operations proc_root_operations = {
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.read = generic_read_dir,
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.readdir = proc_root_readdir,
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};
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/*
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* proc root can do almost nothing..
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*/
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static struct inode_operations proc_root_inode_operations = {
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.lookup = proc_root_lookup,
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};
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/*
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* This is the root "inode" in the /proc tree..
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*/
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struct proc_dir_entry proc_root = {
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.low_ino = PROC_ROOT_INO,
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.namelen = 5,
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.name = "/proc",
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.mode = S_IFDIR | S_IRUGO | S_IXUGO,
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.nlink = 2,
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.proc_iops = &proc_root_inode_operations,
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.proc_fops = &proc_root_operations,
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.parent = &proc_root,
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};
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EXPORT_SYMBOL(proc_symlink);
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EXPORT_SYMBOL(proc_mkdir);
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EXPORT_SYMBOL(create_proc_entry);
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EXPORT_SYMBOL(remove_proc_entry);
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EXPORT_SYMBOL(proc_root);
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EXPORT_SYMBOL(proc_root_fs);
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EXPORT_SYMBOL(proc_net);
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EXPORT_SYMBOL(proc_net_stat);
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EXPORT_SYMBOL(proc_bus);
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EXPORT_SYMBOL(proc_root_driver);
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