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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | /* * linux/fs/proc/root.c * * Copyright (C) 1991, 1992 Linus Torvalds * * proc root directory handling functions */ #include <asm/uaccess.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/config.h> #include <linux/init.h> #include <asm/bitops.h> struct proc_dir_entry *proc_net, *proc_bus, *proc_root_fs, *proc_root_driver; #ifdef CONFIG_SYSCTL struct proc_dir_entry *proc_sys_root; #endif void __init proc_root_init(void) { proc_misc_init(); proc_net = proc_mkdir("net", 0); #ifdef CONFIG_SYSVIPC proc_mkdir("sysvipc", 0); #endif #ifdef CONFIG_SYSCTL proc_sys_root = proc_mkdir("sys", 0); #endif proc_root_fs = proc_mkdir("fs", 0); proc_root_driver = proc_mkdir("driver", 0); #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) /* just give it a mountpoint */ proc_mkdir("openprom", 0); #endif proc_tty_init(); #ifdef CONFIG_PROC_DEVICETREE proc_device_tree_init(); #endif proc_bus = proc_mkdir("bus", 0); } static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry) { if (dir->i_ino == PROC_ROOT_INO) { /* check for safety... */ int nlink = proc_root.nlink; nlink += nr_threads; dir->i_nlink = nlink; } if (!proc_lookup(dir, dentry)) return NULL; return proc_pid_lookup(dir, dentry); } static int proc_root_readdir(struct file * filp, void * dirent, filldir_t filldir) { unsigned int nr = filp->f_pos; if (nr < FIRST_PROCESS_ENTRY) { int error = proc_readdir(filp, dirent, filldir); if (error <= 0) return error; filp->f_pos = FIRST_PROCESS_ENTRY; } return proc_pid_readdir(filp, dirent, filldir); } /* * The root /proc directory is special, as it has the * <pid> directories. Thus we don't use the generic * directory handling functions for that.. */ static struct file_operations proc_root_operations = { read: generic_read_dir, readdir: proc_root_readdir, }; /* * proc root can do almost nothing.. */ static struct inode_operations proc_root_inode_operations = { lookup: proc_root_lookup, }; /* * This is the root "inode" in the /proc tree.. */ struct proc_dir_entry proc_root = { low_ino: PROC_ROOT_INO, namelen: 5, name: "/proc", mode: S_IFDIR | S_IRUGO | S_IXUGO, nlink: 2, proc_iops: &proc_root_inode_operations, proc_fops: &proc_root_operations, parent: &proc_root, }; |