diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/proc/root.c')
-rw-r--r-- | ANDROID_3.4.5/fs/proc/root.c | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/ANDROID_3.4.5/fs/proc/root.c b/ANDROID_3.4.5/fs/proc/root.c deleted file mode 100644 index eed44bfc..00000000 --- a/ANDROID_3.4.5/fs/proc/root.c +++ /dev/null @@ -1,278 +0,0 @@ -/* - * 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 <linux/parser.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; -} - -enum { - Opt_gid, Opt_hidepid, Opt_err, -}; - -static const match_table_t tokens = { - {Opt_hidepid, "hidepid=%u"}, - {Opt_gid, "gid=%u"}, - {Opt_err, NULL}, -}; - -static int proc_parse_options(char *options, struct pid_namespace *pid) -{ - char *p; - substring_t args[MAX_OPT_ARGS]; - int option; - - if (!options) - return 1; - - while ((p = strsep(&options, ",")) != NULL) { - int token; - if (!*p) - continue; - - args[0].to = args[0].from = 0; - token = match_token(p, tokens, args); - switch (token) { - case Opt_gid: - if (match_int(&args[0], &option)) - return 0; - pid->pid_gid = option; - break; - case Opt_hidepid: - if (match_int(&args[0], &option)) - return 0; - if (option < 0 || option > 2) { - pr_err("proc: hidepid value must be between 0 and 2.\n"); - return 0; - } - pid->hide_pid = option; - break; - default: - pr_err("proc: unrecognized mount option \"%s\" " - "or missing value\n", p); - return 0; - } - } - - return 1; -} - -int proc_remount(struct super_block *sb, int *flags, char *data) -{ - struct pid_namespace *pid = sb->s_fs_info; - return !proc_parse_options(data, pid); -} - -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; - char *options; - - if (flags & MS_KERNMOUNT) { - ns = (struct pid_namespace *)data; - options = NULL; - } else { - ns = current->nsproxy->pid_ns; - options = data; - } - - sb = sget(fs_type, proc_test_super, proc_set_super, ns); - if (IS_ERR(sb)) - return ERR_CAST(sb); - - if (!proc_parse_options(options, ns)) { - deactivate_locked_super(sb); - return ERR_PTR(-EINVAL); - } - - 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) -{ - int err; - - proc_init_inodecache(); - err = register_filesystem(&proc_fs_type); - if (err) - return; - err = pid_ns_prepare_proc(&init_pid_ns); - if (err) { - unregister_filesystem(&proc_fs_type); - return; - } - - 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) -{ - kern_unmount(ns->proc_mnt); -} |