Loading...
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | /* * 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/time.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/module.h> #include <linux/bitops.h> #include <linux/mount.h> #include <linux/pid_namespace.h> #include "internal.h" static int proc_test_super(struct super_block *sb, void *data) { return sb->s_fs_info == data; } static int proc_set_super(struct super_block *sb, void *data) { int err = set_anon_super(sb, NULL); if (!err) { struct pid_namespace *ns = (struct pid_namespace *)data; sb->s_fs_info = get_pid_ns(ns); } return err; } static struct dentry *proc_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { int err; struct super_block *sb; struct pid_namespace *ns; struct proc_inode *ei; if (flags & MS_KERNMOUNT) ns = (struct pid_namespace *)data; else ns = current->nsproxy->pid_ns; sb = sget(fs_type, proc_test_super, proc_set_super, ns); if (IS_ERR(sb)) return ERR_CAST(sb); if (!sb->s_root) { sb->s_flags = flags; err = proc_fill_super(sb); if (err) { deactivate_locked_super(sb); return ERR_PTR(err); } sb->s_flags |= MS_ACTIVE; } ei = PROC_I(sb->s_root->d_inode); if (!ei->pid) { rcu_read_lock(); ei->pid = get_pid(find_pid_ns(1, ns)); rcu_read_unlock(); } return dget(sb->s_root); } static void proc_kill_sb(struct super_block *sb) { struct pid_namespace *ns; ns = (struct pid_namespace *)sb->s_fs_info; kill_anon_super(sb); put_pid_ns(ns); } static struct file_system_type proc_fs_type = { .name = "proc", .mount = proc_mount, .kill_sb = proc_kill_sb, }; void __init proc_root_init(void) { struct vfsmount *mnt; int err; proc_init_inodecache(); err = register_filesystem(&proc_fs_type); if (err) return; mnt = kern_mount_data(&proc_fs_type, &init_pid_ns); if (IS_ERR(mnt)) { unregister_filesystem(&proc_fs_type); return; } init_pid_ns.proc_mnt = mnt; proc_symlink("mounts", NULL, "self/mounts"); proc_net_init(); #ifdef CONFIG_SYSVIPC proc_mkdir("sysvipc", NULL); #endif proc_mkdir("fs", NULL); proc_mkdir("driver", NULL); proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */ #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) /* just give it a mountpoint */ proc_mkdir("openprom", NULL); #endif proc_tty_init(); #ifdef CONFIG_PROC_DEVICETREE proc_device_tree_init(); #endif proc_mkdir("bus", NULL); proc_sys_init(); } static int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat ) { generic_fillattr(dentry->d_inode, stat); stat->nlink = proc_root.nlink + nr_processes(); return 0; } static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd) { if (!proc_lookup(dir, dentry, nd)) { return NULL; } return proc_pid_lookup(dir, dentry, nd); } static int proc_root_readdir(struct file * filp, void * dirent, filldir_t filldir) { unsigned int nr = filp->f_pos; int ret; if (nr < FIRST_PROCESS_ENTRY) { int error = proc_readdir(filp, dirent, filldir); if (error <= 0) return error; filp->f_pos = FIRST_PROCESS_ENTRY; } ret = proc_pid_readdir(filp, dirent, filldir); return ret; } /* * 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 const struct file_operations proc_root_operations = { .read = generic_read_dir, .readdir = proc_root_readdir, .llseek = default_llseek, }; /* * proc root can do almost nothing.. */ static const struct inode_operations proc_root_inode_operations = { .lookup = proc_root_lookup, .getattr = proc_root_getattr, }; /* * This is the root "inode" in the /proc tree.. */ struct proc_dir_entry proc_root = { .low_ino = PROC_ROOT_INO, .namelen = 5, .mode = S_IFDIR | S_IRUGO | S_IXUGO, .nlink = 2, .count = ATOMIC_INIT(1), .proc_iops = &proc_root_inode_operations, .proc_fops = &proc_root_operations, .parent = &proc_root, .name = "/proc", }; int pid_ns_prepare_proc(struct pid_namespace *ns) { struct vfsmount *mnt; mnt = kern_mount_data(&proc_fs_type, ns); if (IS_ERR(mnt)) return PTR_ERR(mnt); ns->proc_mnt = mnt; return 0; } void pid_ns_release_proc(struct pid_namespace *ns) { mntput(ns->proc_mnt); } |