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Subject[PATCH 07/10] autofs - delete fs/autofs4 source files
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Date
Delete the now unused autofs4 module files.

Signed-off-by: Ian Kent <raven@themaw.net>
---
fs/autofs4/autofs_i.h | 273 --------------
fs/autofs4/dev-ioctl.c | 761 ---------------------------------------
fs/autofs4/expire.c | 632 --------------------------------
fs/autofs4/init.c | 48 --
fs/autofs4/inode.c | 375 -------------------
fs/autofs4/root.c | 942 ------------------------------------------------
fs/autofs4/symlink.c | 29 -
fs/autofs4/waitq.c | 559 ----------------------------
8 files changed, 3619 deletions(-)
delete mode 100644 fs/autofs4/autofs_i.h
delete mode 100644 fs/autofs4/dev-ioctl.c
delete mode 100644 fs/autofs4/expire.c
delete mode 100644 fs/autofs4/init.c
delete mode 100644 fs/autofs4/inode.c
delete mode 100644 fs/autofs4/root.c
delete mode 100644 fs/autofs4/symlink.c
delete mode 100644 fs/autofs4/waitq.c

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
deleted file mode 100644
index 9110b66c7ef1..000000000000
--- a/fs/autofs4/autofs_i.h
+++ /dev/null
@@ -1,273 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
- * Copyright 2005-2006 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-/* Internal header file for autofs */
-
-#include <linux/auto_fs.h>
-#include <linux/auto_dev-ioctl.h>
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/time.h>
-#include <linux/string.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <linux/mount.h>
-#include <linux/namei.h>
-#include <linux/uaccess.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-#include <linux/list.h>
-#include <linux/completion.h>
-#include <asm/current.h>
-
-/* This is the range of ioctl() numbers we claim as ours */
-#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
-#define AUTOFS_IOC_COUNT 32
-
-#define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION)
-#define AUTOFS_DEV_IOCTL_IOC_COUNT \
- (AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD)
-
-#ifdef pr_fmt
-#undef pr_fmt
-#endif
-#define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__
-
-/*
- * Unified info structure. This is pointed to by both the dentry and
- * inode structures. Each file in the filesystem has an instance of this
- * structure. It holds a reference to the dentry, so dentries are never
- * flushed while the file exists. All name lookups are dealt with at the
- * dentry level, although the filesystem can interfere in the validation
- * process. Readdir is implemented by traversing the dentry lists.
- */
-struct autofs_info {
- struct dentry *dentry;
- struct inode *inode;
-
- int flags;
-
- struct completion expire_complete;
-
- struct list_head active;
- int active_count;
-
- struct list_head expiring;
-
- struct autofs_sb_info *sbi;
- unsigned long last_used;
- atomic_t count;
-
- kuid_t uid;
- kgid_t gid;
-};
-
-#define AUTOFS_INF_EXPIRING (1<<0) /* dentry in the process of expiring */
-#define AUTOFS_INF_WANT_EXPIRE (1<<1) /* the dentry is being considered
- * for expiry, so RCU_walk is
- * not permitted. If it progresses to
- * actual expiry attempt, the flag is
- * not cleared when EXPIRING is set -
- * in that case it gets cleared only
- * when it comes to clearing EXPIRING.
- */
-#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
-
-struct autofs_wait_queue {
- wait_queue_head_t queue;
- struct autofs_wait_queue *next;
- autofs_wqt_t wait_queue_token;
- /* We use the following to see what we are waiting for */
- struct qstr name;
- u32 dev;
- u64 ino;
- kuid_t uid;
- kgid_t gid;
- pid_t pid;
- pid_t tgid;
- /* This is for status reporting upon return */
- int status;
- unsigned int wait_ctr;
-};
-
-#define AUTOFS_SBI_MAGIC 0x6d4a556d
-
-struct autofs_sb_info {
- u32 magic;
- int pipefd;
- struct file *pipe;
- struct pid *oz_pgrp;
- int catatonic;
- int version;
- int sub_version;
- int min_proto;
- int max_proto;
- unsigned long exp_timeout;
- unsigned int type;
- struct super_block *sb;
- struct mutex wq_mutex;
- struct mutex pipe_mutex;
- spinlock_t fs_lock;
- struct autofs_wait_queue *queues; /* Wait queue pointer */
- spinlock_t lookup_lock;
- struct list_head active_list;
- struct list_head expiring_list;
- struct rcu_head rcu;
-};
-
-static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
-{
- return (struct autofs_sb_info *)(sb->s_fs_info);
-}
-
-static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)
-{
- return (struct autofs_info *)(dentry->d_fsdata);
-}
-
-/* autofs_oz_mode(): do we see the man behind the curtain? (The
- * processes which do manipulations for us in user space sees the raw
- * filesystem without "magic".)
- */
-static inline int autofs_oz_mode(struct autofs_sb_info *sbi)
-{
- return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;
-}
-
-struct inode *autofs_get_inode(struct super_block *, umode_t);
-void autofs_free_ino(struct autofs_info *);
-
-/* Expiration */
-int is_autofs_dentry(struct dentry *);
-int autofs_expire_wait(const struct path *path, int rcu_walk);
-int autofs_expire_run(struct super_block *, struct vfsmount *,
- struct autofs_sb_info *,
- struct autofs_packet_expire __user *);
-int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
- struct autofs_sb_info *sbi, int when);
-int autofs_expire_multi(struct super_block *, struct vfsmount *,
- struct autofs_sb_info *, int __user *);
-struct dentry *autofs_expire_direct(struct super_block *sb,
- struct vfsmount *mnt,
- struct autofs_sb_info *sbi, int how);
-struct dentry *autofs_expire_indirect(struct super_block *sb,
- struct vfsmount *mnt,
- struct autofs_sb_info *sbi, int how);
-
-/* Device node initialization */
-
-int autofs_dev_ioctl_init(void);
-void autofs_dev_ioctl_exit(void);
-
-/* Operations structures */
-
-extern const struct inode_operations autofs_symlink_inode_operations;
-extern const struct inode_operations autofs_dir_inode_operations;
-extern const struct file_operations autofs_dir_operations;
-extern const struct file_operations autofs_root_operations;
-extern const struct dentry_operations autofs_dentry_operations;
-
-/* VFS automount flags management functions */
-static inline void __managed_dentry_set_managed(struct dentry *dentry)
-{
- dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
-}
-
-static inline void managed_dentry_set_managed(struct dentry *dentry)
-{
- spin_lock(&dentry->d_lock);
- __managed_dentry_set_managed(dentry);
- spin_unlock(&dentry->d_lock);
-}
-
-static inline void __managed_dentry_clear_managed(struct dentry *dentry)
-{
- dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
-}
-
-static inline void managed_dentry_clear_managed(struct dentry *dentry)
-{
- spin_lock(&dentry->d_lock);
- __managed_dentry_clear_managed(dentry);
- spin_unlock(&dentry->d_lock);
-}
-
-/* Initializing function */
-
-int autofs_fill_super(struct super_block *, void *, int);
-struct autofs_info *autofs_new_ino(struct autofs_sb_info *);
-void autofs_clean_ino(struct autofs_info *);
-
-static inline int autofs_prepare_pipe(struct file *pipe)
-{
- if (!(pipe->f_mode & FMODE_CAN_WRITE))
- return -EINVAL;
- if (!S_ISFIFO(file_inode(pipe)->i_mode))
- return -EINVAL;
- /* We want a packet pipe */
- pipe->f_flags |= O_DIRECT;
- return 0;
-}
-
-/* Queue management functions */
-
-int autofs_wait(struct autofs_sb_info *,
- const struct path *, enum autofs_notify);
-int autofs_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
-void autofs_catatonic_mode(struct autofs_sb_info *);
-
-static inline u32 autofs_get_dev(struct autofs_sb_info *sbi)
-{
- return new_encode_dev(sbi->sb->s_dev);
-}
-
-static inline u64 autofs_get_ino(struct autofs_sb_info *sbi)
-{
- return d_inode(sbi->sb->s_root)->i_ino;
-}
-
-static inline void __autofs_add_expiring(struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
-
- if (ino) {
- if (list_empty(&ino->expiring))
- list_add(&ino->expiring, &sbi->expiring_list);
- }
-}
-
-static inline void autofs_add_expiring(struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
-
- if (ino) {
- spin_lock(&sbi->lookup_lock);
- if (list_empty(&ino->expiring))
- list_add(&ino->expiring, &sbi->expiring_list);
- spin_unlock(&sbi->lookup_lock);
- }
-}
-
-static inline void autofs_del_expiring(struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
-
- if (ino) {
- spin_lock(&sbi->lookup_lock);
- if (!list_empty(&ino->expiring))
- list_del_init(&ino->expiring);
- spin_unlock(&sbi->lookup_lock);
- }
-}
-
-void autofs_kill_sb(struct super_block *);
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
deleted file mode 100644
index a2281ab2b957..000000000000
--- a/fs/autofs4/dev-ioctl.c
+++ /dev/null
@@ -1,761 +0,0 @@
-/*
- * Copyright 2008 Red Hat, Inc. All rights reserved.
- * Copyright 2008 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/miscdevice.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/namei.h>
-#include <linux/fcntl.h>
-#include <linux/file.h>
-#include <linux/fdtable.h>
-#include <linux/sched.h>
-#include <linux/cred.h>
-#include <linux/compat.h>
-#include <linux/syscalls.h>
-#include <linux/magic.h>
-#include <linux/dcache.h>
-#include <linux/uaccess.h>
-#include <linux/slab.h>
-
-#include "autofs_i.h"
-
-/*
- * This module implements an interface for routing autofs ioctl control
- * commands via a miscellaneous device file.
- *
- * The alternate interface is needed because we need to be able open
- * an ioctl file descriptor on an autofs mount that may be covered by
- * another mount. This situation arises when starting automount(8)
- * or other user space daemon which uses direct mounts or offset
- * mounts (used for autofs lazy mount/umount of nested mount trees),
- * which have been left busy at at service shutdown.
- */
-
-typedef int (*ioctl_fn)(struct file *, struct autofs_sb_info *,
- struct autofs_dev_ioctl *);
-
-static int check_name(const char *name)
-{
- if (!strchr(name, '/'))
- return -EINVAL;
- return 0;
-}
-
-/*
- * Check a string doesn't overrun the chunk of
- * memory we copied from user land.
- */
-static int invalid_str(char *str, size_t size)
-{
- if (memchr(str, 0, size))
- return 0;
- return -EINVAL;
-}
-
-/*
- * Check that the user compiled against correct version of autofs
- * misc device code.
- *
- * As well as checking the version compatibility this always copies
- * the kernel interface version out.
- */
-static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
-{
- int err = 0;
-
- if ((param->ver_major != AUTOFS_DEV_IOCTL_VERSION_MAJOR) ||
- (param->ver_minor > AUTOFS_DEV_IOCTL_VERSION_MINOR)) {
- pr_warn("ioctl control interface version mismatch: "
- "kernel(%u.%u), user(%u.%u), cmd(0x%08x)\n",
- AUTOFS_DEV_IOCTL_VERSION_MAJOR,
- AUTOFS_DEV_IOCTL_VERSION_MINOR,
- param->ver_major, param->ver_minor, cmd);
- err = -EINVAL;
- }
-
- /* Fill in the kernel version. */
- param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
- param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
-
- return err;
-}
-
-/*
- * Copy parameter control struct, including a possible path allocated
- * at the end of the struct.
- */
-static struct autofs_dev_ioctl *
-copy_dev_ioctl(struct autofs_dev_ioctl __user *in)
-{
- struct autofs_dev_ioctl tmp, *res;
-
- if (copy_from_user(&tmp, in, AUTOFS_DEV_IOCTL_SIZE))
- return ERR_PTR(-EFAULT);
-
- if (tmp.size < AUTOFS_DEV_IOCTL_SIZE)
- return ERR_PTR(-EINVAL);
-
- if (tmp.size > AUTOFS_DEV_IOCTL_SIZE + PATH_MAX)
- return ERR_PTR(-ENAMETOOLONG);
-
- res = memdup_user(in, tmp.size);
- if (!IS_ERR(res))
- res->size = tmp.size;
-
- return res;
-}
-
-static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)
-{
- kfree(param);
-}
-
-/*
- * Check sanity of parameter control fields and if a path is present
- * check that it is terminated and contains at least one "/".
- */
-static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
-{
- int err;
-
- err = check_dev_ioctl_version(cmd, param);
- if (err) {
- pr_warn("invalid device control module version "
- "supplied for cmd(0x%08x)\n", cmd);
- goto out;
- }
-
- if (param->size > AUTOFS_DEV_IOCTL_SIZE) {
- err = invalid_str(param->path, param->size - AUTOFS_DEV_IOCTL_SIZE);
- if (err) {
- pr_warn(
- "path string terminator missing for cmd(0x%08x)\n",
- cmd);
- goto out;
- }
-
- err = check_name(param->path);
- if (err) {
- pr_warn("invalid path supplied for cmd(0x%08x)\n",
- cmd);
- goto out;
- }
- }
-
- err = 0;
-out:
- return err;
-}
-
-/*
- * Get the autofs super block info struct from the file opened on
- * the autofs mount point.
- */
-static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f)
-{
- struct autofs_sb_info *sbi = NULL;
- struct inode *inode;
-
- if (f) {
- inode = file_inode(f);
- sbi = autofs_sbi(inode->i_sb);
- }
- return sbi;
-}
-
-/* Return autofs dev ioctl version */
-static int autofs_dev_ioctl_version(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- /* This should have already been set. */
- param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
- param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
- return 0;
-}
-
-/* Return autofs module protocol version */
-static int autofs_dev_ioctl_protover(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- param->protover.version = sbi->version;
- return 0;
-}
-
-/* Return autofs module protocol sub version */
-static int autofs_dev_ioctl_protosubver(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- param->protosubver.sub_version = sbi->sub_version;
- return 0;
-}
-
-/* Find the topmost mount satisfying test() */
-static int find_autofs_mount(const char *pathname,
- struct path *res,
- int test(const struct path *path, void *data),
- void *data)
-{
- struct path path;
- int err;
-
- err = kern_path_mountpoint(AT_FDCWD, pathname, &path, 0);
- if (err)
- return err;
- err = -ENOENT;
- while (path.dentry == path.mnt->mnt_root) {
- if (path.dentry->d_sb->s_magic == AUTOFS_SUPER_MAGIC) {
- if (test(&path, data)) {
- path_get(&path);
- *res = path;
- err = 0;
- break;
- }
- }
- if (!follow_up(&path))
- break;
- }
- path_put(&path);
- return err;
-}
-
-static int test_by_dev(const struct path *path, void *p)
-{
- return path->dentry->d_sb->s_dev == *(dev_t *)p;
-}
-
-static int test_by_type(const struct path *path, void *p)
-{
- struct autofs_info *ino = autofs_dentry_ino(path->dentry);
-
- return ino && ino->sbi->type & *(unsigned *)p;
-}
-
-/*
- * Open a file descriptor on the autofs mount point corresponding
- * to the given path and device number (aka. new_encode_dev(sb->s_dev)).
- */
-static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid)
-{
- int err, fd;
-
- fd = get_unused_fd_flags(O_CLOEXEC);
- if (likely(fd >= 0)) {
- struct file *filp;
- struct path path;
-
- err = find_autofs_mount(name, &path, test_by_dev, &devid);
- if (err)
- goto out;
-
- filp = dentry_open(&path, O_RDONLY, current_cred());
- path_put(&path);
- if (IS_ERR(filp)) {
- err = PTR_ERR(filp);
- goto out;
- }
-
- fd_install(fd, filp);
- }
-
- return fd;
-
-out:
- put_unused_fd(fd);
- return err;
-}
-
-/* Open a file descriptor on an autofs mount point */
-static int autofs_dev_ioctl_openmount(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- const char *path;
- dev_t devid;
- int err, fd;
-
- /* param->path has already been checked */
- if (!param->openmount.devid)
- return -EINVAL;
-
- param->ioctlfd = -1;
-
- path = param->path;
- devid = new_decode_dev(param->openmount.devid);
-
- err = 0;
- fd = autofs_dev_ioctl_open_mountpoint(path, devid);
- if (unlikely(fd < 0)) {
- err = fd;
- goto out;
- }
-
- param->ioctlfd = fd;
-out:
- return err;
-}
-
-/* Close file descriptor allocated above (user can also use close(2)). */
-static int autofs_dev_ioctl_closemount(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- return ksys_close(param->ioctlfd);
-}
-
-/*
- * Send "ready" status for an existing wait (either a mount or an expire
- * request).
- */
-static int autofs_dev_ioctl_ready(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- autofs_wqt_t token;
-
- token = (autofs_wqt_t) param->ready.token;
- return autofs_wait_release(sbi, token, 0);
-}
-
-/*
- * Send "fail" status for an existing wait (either a mount or an expire
- * request).
- */
-static int autofs_dev_ioctl_fail(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- autofs_wqt_t token;
- int status;
-
- token = (autofs_wqt_t) param->fail.token;
- status = param->fail.status < 0 ? param->fail.status : -ENOENT;
- return autofs_wait_release(sbi, token, status);
-}
-
-/*
- * Set the pipe fd for kernel communication to the daemon.
- *
- * Normally this is set at mount using an option but if we
- * are reconnecting to a busy mount then we need to use this
- * to tell the autofs mount about the new kernel pipe fd. In
- * order to protect mounts against incorrectly setting the
- * pipefd we also require that the autofs mount be catatonic.
- *
- * This also sets the process group id used to identify the
- * controlling process (eg. the owning automount(8) daemon).
- */
-static int autofs_dev_ioctl_setpipefd(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- int pipefd;
- int err = 0;
- struct pid *new_pid = NULL;
-
- if (param->setpipefd.pipefd == -1)
- return -EINVAL;
-
- pipefd = param->setpipefd.pipefd;
-
- mutex_lock(&sbi->wq_mutex);
- if (!sbi->catatonic) {
- mutex_unlock(&sbi->wq_mutex);
- return -EBUSY;
- } else {
- struct file *pipe;
-
- new_pid = get_task_pid(current, PIDTYPE_PGID);
-
- if (ns_of_pid(new_pid) != ns_of_pid(sbi->oz_pgrp)) {
- pr_warn("not allowed to change PID namespace\n");
- err = -EINVAL;
- goto out;
- }
-
- pipe = fget(pipefd);
- if (!pipe) {
- err = -EBADF;
- goto out;
- }
- if (autofs_prepare_pipe(pipe) < 0) {
- err = -EPIPE;
- fput(pipe);
- goto out;
- }
- swap(sbi->oz_pgrp, new_pid);
- sbi->pipefd = pipefd;
- sbi->pipe = pipe;
- sbi->catatonic = 0;
- }
-out:
- put_pid(new_pid);
- mutex_unlock(&sbi->wq_mutex);
- return err;
-}
-
-/*
- * Make the autofs mount point catatonic, no longer responsive to
- * mount requests. Also closes the kernel pipe file descriptor.
- */
-static int autofs_dev_ioctl_catatonic(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- autofs_catatonic_mode(sbi);
- return 0;
-}
-
-/* Set the autofs mount timeout */
-static int autofs_dev_ioctl_timeout(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- unsigned long timeout;
-
- timeout = param->timeout.timeout;
- param->timeout.timeout = sbi->exp_timeout / HZ;
- sbi->exp_timeout = timeout * HZ;
- return 0;
-}
-
-/*
- * Return the uid and gid of the last request for the mount
- *
- * When reconstructing an autofs mount tree with active mounts
- * we need to re-connect to mounts that may have used the original
- * process uid and gid (or string variations of them) for mount
- * lookups within the map entry.
- */
-static int autofs_dev_ioctl_requester(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- struct autofs_info *ino;
- struct path path;
- dev_t devid;
- int err = -ENOENT;
-
- if (param->size <= AUTOFS_DEV_IOCTL_SIZE) {
- err = -EINVAL;
- goto out;
- }
-
- devid = sbi->sb->s_dev;
-
- param->requester.uid = param->requester.gid = -1;
-
- err = find_autofs_mount(param->path, &path, test_by_dev, &devid);
- if (err)
- goto out;
-
- ino = autofs_dentry_ino(path.dentry);
- if (ino) {
- err = 0;
- autofs_expire_wait(&path, 0);
- spin_lock(&sbi->fs_lock);
- param->requester.uid =
- from_kuid_munged(current_user_ns(), ino->uid);
- param->requester.gid =
- from_kgid_munged(current_user_ns(), ino->gid);
- spin_unlock(&sbi->fs_lock);
- }
- path_put(&path);
-out:
- return err;
-}
-
-/*
- * Call repeatedly until it returns -EAGAIN, meaning there's nothing
- * more that can be done.
- */
-static int autofs_dev_ioctl_expire(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- struct vfsmount *mnt;
- int how;
-
- how = param->expire.how;
- mnt = fp->f_path.mnt;
-
- return autofs_do_expire_multi(sbi->sb, mnt, sbi, how);
-}
-
-/* Check if autofs mount point is in use */
-static int autofs_dev_ioctl_askumount(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- param->askumount.may_umount = 0;
- if (may_umount(fp->f_path.mnt))
- param->askumount.may_umount = 1;
- return 0;
-}
-
-/*
- * Check if the given path is a mountpoint.
- *
- * If we are supplied with the file descriptor of an autofs
- * mount we're looking for a specific mount. In this case
- * the path is considered a mountpoint if it is itself a
- * mountpoint or contains a mount, such as a multi-mount
- * without a root mount. In this case we return 1 if the
- * path is a mount point and the super magic of the covering
- * mount if there is one or 0 if it isn't a mountpoint.
- *
- * If we aren't supplied with a file descriptor then we
- * lookup the path and check if it is the root of a mount.
- * If a type is given we are looking for a particular autofs
- * mount and if we don't find a match we return fail. If the
- * located path is the root of a mount we return 1 along with
- * the super magic of the mount or 0 otherwise.
- *
- * In both cases the the device number (as returned by
- * new_encode_dev()) is also returned.
- */
-static int autofs_dev_ioctl_ismountpoint(struct file *fp,
- struct autofs_sb_info *sbi,
- struct autofs_dev_ioctl *param)
-{
- struct path path;
- const char *name;
- unsigned int type;
- unsigned int devid, magic;
- int err = -ENOENT;
-
- if (param->size <= AUTOFS_DEV_IOCTL_SIZE) {
- err = -EINVAL;
- goto out;
- }
-
- name = param->path;
- type = param->ismountpoint.in.type;
-
- param->ismountpoint.out.devid = devid = 0;
- param->ismountpoint.out.magic = magic = 0;
-
- if (!fp || param->ioctlfd == -1) {
- if (autofs_type_any(type))
- err = kern_path_mountpoint(AT_FDCWD,
- name, &path, LOOKUP_FOLLOW);
- else
- err = find_autofs_mount(name, &path,
- test_by_type, &type);
- if (err)
- goto out;
- devid = new_encode_dev(path.dentry->d_sb->s_dev);
- err = 0;
- if (path.mnt->mnt_root == path.dentry) {
- err = 1;
- magic = path.dentry->d_sb->s_magic;
- }
- } else {
- dev_t dev = sbi->sb->s_dev;
-
- err = find_autofs_mount(name, &path, test_by_dev, &dev);
- if (err)
- goto out;
-
- devid = new_encode_dev(dev);
-
- err = path_has_submounts(&path);
-
- if (follow_down_one(&path))
- magic = path.dentry->d_sb->s_magic;
- }
-
- param->ismountpoint.out.devid = devid;
- param->ismountpoint.out.magic = magic;
- path_put(&path);
-out:
- return err;
-}
-
-/*
- * Our range of ioctl numbers isn't 0 based so we need to shift
- * the array index by _IOC_NR(AUTOFS_CTL_IOC_FIRST) for the table
- * lookup.
- */
-#define cmd_idx(cmd) (cmd - _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST))
-
-static ioctl_fn lookup_dev_ioctl(unsigned int cmd)
-{
- static ioctl_fn _ioctls[] = {
- autofs_dev_ioctl_version,
- autofs_dev_ioctl_protover,
- autofs_dev_ioctl_protosubver,
- autofs_dev_ioctl_openmount,
- autofs_dev_ioctl_closemount,
- autofs_dev_ioctl_ready,
- autofs_dev_ioctl_fail,
- autofs_dev_ioctl_setpipefd,
- autofs_dev_ioctl_catatonic,
- autofs_dev_ioctl_timeout,
- autofs_dev_ioctl_requester,
- autofs_dev_ioctl_expire,
- autofs_dev_ioctl_askumount,
- autofs_dev_ioctl_ismountpoint,
- };
- unsigned int idx = cmd_idx(cmd);
-
- return (idx >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[idx];
-}
-
-/* ioctl dispatcher */
-static int _autofs_dev_ioctl(unsigned int command,
- struct autofs_dev_ioctl __user *user)
-{
- struct autofs_dev_ioctl *param;
- struct file *fp;
- struct autofs_sb_info *sbi;
- unsigned int cmd_first, cmd;
- ioctl_fn fn = NULL;
- int err = 0;
-
- cmd_first = _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST);
- cmd = _IOC_NR(command);
-
- if (_IOC_TYPE(command) != _IOC_TYPE(AUTOFS_DEV_IOCTL_IOC_FIRST) ||
- cmd - cmd_first > AUTOFS_DEV_IOCTL_IOC_COUNT) {
- return -ENOTTY;
- }
-
- /* Only root can use ioctls other than AUTOFS_DEV_IOCTL_VERSION_CMD
- * and AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD
- */
- if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
- cmd != AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- /* Copy the parameters into kernel space. */
- param = copy_dev_ioctl(user);
- if (IS_ERR(param))
- return PTR_ERR(param);
-
- err = validate_dev_ioctl(command, param);
- if (err)
- goto out;
-
- fn = lookup_dev_ioctl(cmd);
- if (!fn) {
- pr_warn("unknown command 0x%08x\n", command);
- err = -ENOTTY;
- goto out;
- }
-
- fp = NULL;
- sbi = NULL;
-
- /*
- * For obvious reasons the openmount can't have a file
- * descriptor yet. We don't take a reference to the
- * file during close to allow for immediate release,
- * and the same for retrieving ioctl version.
- */
- if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
- cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
- cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
- fp = fget(param->ioctlfd);
- if (!fp) {
- if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD)
- goto cont;
- err = -EBADF;
- goto out;
- }
-
- sbi = autofs_dev_ioctl_sbi(fp);
- if (!sbi || sbi->magic != AUTOFS_SBI_MAGIC) {
- err = -EINVAL;
- fput(fp);
- goto out;
- }
-
- /*
- * Admin needs to be able to set the mount catatonic in
- * order to be able to perform the re-open.
- */
- if (!autofs_oz_mode(sbi) &&
- cmd != AUTOFS_DEV_IOCTL_CATATONIC_CMD) {
- err = -EACCES;
- fput(fp);
- goto out;
- }
- }
-cont:
- err = fn(fp, sbi, param);
-
- if (fp)
- fput(fp);
- if (err >= 0 && copy_to_user(user, param, AUTOFS_DEV_IOCTL_SIZE))
- err = -EFAULT;
-out:
- free_dev_ioctl(param);
- return err;
-}
-
-static long autofs_dev_ioctl(struct file *file, unsigned int command,
- unsigned long u)
-{
- int err;
-
- err = _autofs_dev_ioctl(command, (struct autofs_dev_ioctl __user *) u);
- return (long) err;
-}
-
-#ifdef CONFIG_COMPAT
-static long autofs_dev_ioctl_compat(struct file *file, unsigned int command,
- unsigned long u)
-{
- return autofs_dev_ioctl(file, command, (unsigned long) compat_ptr(u));
-}
-#else
-#define autofs_dev_ioctl_compat NULL
-#endif
-
-static const struct file_operations _dev_ioctl_fops = {
- .unlocked_ioctl = autofs_dev_ioctl,
- .compat_ioctl = autofs_dev_ioctl_compat,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
-};
-
-static struct miscdevice _autofs_dev_ioctl_misc = {
- .minor = AUTOFS_MINOR,
- .name = AUTOFS_DEVICE_NAME,
- .fops = &_dev_ioctl_fops,
- .mode = 0644,
-};
-
-MODULE_ALIAS_MISCDEV(AUTOFS_MINOR);
-MODULE_ALIAS("devname:autofs");
-
-/* Register/deregister misc character device */
-int __init autofs_dev_ioctl_init(void)
-{
- int r;
-
- r = misc_register(&_autofs_dev_ioctl_misc);
- if (r) {
- pr_err("misc_register failed for control device\n");
- return r;
- }
-
- return 0;
-}
-
-void autofs_dev_ioctl_exit(void)
-{
- misc_deregister(&_autofs_dev_ioctl_misc);
-}
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
deleted file mode 100644
index 36f16b67a3bf..000000000000
--- a/fs/autofs4/expire.c
+++ /dev/null
@@ -1,632 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
- * Copyright 2001-2006 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include "autofs_i.h"
-
-static unsigned long now;
-
-/* Check if a dentry can be expired */
-static inline int autofs_can_expire(struct dentry *dentry,
- unsigned long timeout, int do_now)
-{
- struct autofs_info *ino = autofs_dentry_ino(dentry);
-
- /* dentry in the process of being deleted */
- if (ino == NULL)
- return 0;
-
- if (!do_now) {
- /* Too young to die */
- if (!timeout || time_after(ino->last_used + timeout, now))
- return 0;
- }
- return 1;
-}
-
-/* Check a mount point for busyness */
-static int autofs_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
-{
- struct dentry *top = dentry;
- struct path path = {.mnt = mnt, .dentry = dentry};
- int status = 1;
-
- pr_debug("dentry %p %pd\n", dentry, dentry);
-
- path_get(&path);
-
- if (!follow_down_one(&path))
- goto done;
-
- if (is_autofs_dentry(path.dentry)) {
- struct autofs_sb_info *sbi = autofs_sbi(path.dentry->d_sb);
-
- /* This is an autofs submount, we can't expire it */
- if (autofs_type_indirect(sbi->type))
- goto done;
- }
-
- /* Update the expiry counter if fs is busy */
- if (!may_umount_tree(path.mnt)) {
- struct autofs_info *ino;
-
- ino = autofs_dentry_ino(top);
- ino->last_used = jiffies;
- goto done;
- }
-
- status = 0;
-done:
- pr_debug("returning = %d\n", status);
- path_put(&path);
- return status;
-}
-
-/*
- * Calculate and dget next entry in the subdirs list under root.
- */
-static struct dentry *get_next_positive_subdir(struct dentry *prev,
- struct dentry *root)
-{
- struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
- struct list_head *next;
- struct dentry *q;
-
- spin_lock(&sbi->lookup_lock);
- spin_lock(&root->d_lock);
-
- if (prev)
- next = prev->d_child.next;
- else {
- prev = dget_dlock(root);
- next = prev->d_subdirs.next;
- }
-
-cont:
- if (next == &root->d_subdirs) {
- spin_unlock(&root->d_lock);
- spin_unlock(&sbi->lookup_lock);
- dput(prev);
- return NULL;
- }
-
- q = list_entry(next, struct dentry, d_child);
-
- spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED);
- /* Already gone or negative dentry (under construction) - try next */
- if (!d_count(q) || !simple_positive(q)) {
- spin_unlock(&q->d_lock);
- next = q->d_child.next;
- goto cont;
- }
- dget_dlock(q);
- spin_unlock(&q->d_lock);
- spin_unlock(&root->d_lock);
- spin_unlock(&sbi->lookup_lock);
-
- dput(prev);
-
- return q;
-}
-
-/*
- * Calculate and dget next entry in top down tree traversal.
- */
-static struct dentry *get_next_positive_dentry(struct dentry *prev,
- struct dentry *root)
-{
- struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
- struct list_head *next;
- struct dentry *p, *ret;
-
- if (prev == NULL)
- return dget(root);
-
- spin_lock(&sbi->lookup_lock);
-relock:
- p = prev;
- spin_lock(&p->d_lock);
-again:
- next = p->d_subdirs.next;
- if (next == &p->d_subdirs) {
- while (1) {
- struct dentry *parent;
-
- if (p == root) {
- spin_unlock(&p->d_lock);
- spin_unlock(&sbi->lookup_lock);
- dput(prev);
- return NULL;
- }
-
- parent = p->d_parent;
- if (!spin_trylock(&parent->d_lock)) {
- spin_unlock(&p->d_lock);
- cpu_relax();
- goto relock;
- }
- spin_unlock(&p->d_lock);
- next = p->d_child.next;
- p = parent;
- if (next != &parent->d_subdirs)
- break;
- }
- }
- ret = list_entry(next, struct dentry, d_child);
-
- spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED);
- /* Negative dentry - try next */
- if (!simple_positive(ret)) {
- spin_unlock(&p->d_lock);
- lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_);
- p = ret;
- goto again;
- }
- dget_dlock(ret);
- spin_unlock(&ret->d_lock);
- spin_unlock(&p->d_lock);
- spin_unlock(&sbi->lookup_lock);
-
- dput(prev);
-
- return ret;
-}
-
-/*
- * Check a direct mount point for busyness.
- * Direct mounts have similar expiry semantics to tree mounts.
- * The tree is not busy iff no mountpoints are busy and there are no
- * autofs submounts.
- */
-static int autofs_direct_busy(struct vfsmount *mnt,
- struct dentry *top,
- unsigned long timeout,
- int do_now)
-{
- pr_debug("top %p %pd\n", top, top);
-
- /* If it's busy update the expiry counters */
- if (!may_umount_tree(mnt)) {
- struct autofs_info *ino;
-
- ino = autofs_dentry_ino(top);
- if (ino)
- ino->last_used = jiffies;
- return 1;
- }
-
- /* Timeout of a direct mount is determined by its top dentry */
- if (!autofs_can_expire(top, timeout, do_now))
- return 1;
-
- return 0;
-}
-
-/*
- * Check a directory tree of mount points for busyness
- * The tree is not busy iff no mountpoints are busy
- */
-static int autofs_tree_busy(struct vfsmount *mnt,
- struct dentry *top,
- unsigned long timeout,
- int do_now)
-{
- struct autofs_info *top_ino = autofs_dentry_ino(top);
- struct dentry *p;
-
- pr_debug("top %p %pd\n", top, top);
-
- /* Negative dentry - give up */
- if (!simple_positive(top))
- return 1;
-
- p = NULL;
- while ((p = get_next_positive_dentry(p, top))) {
- pr_debug("dentry %p %pd\n", p, p);
-
- /*
- * Is someone visiting anywhere in the subtree ?
- * If there's no mount we need to check the usage
- * count for the autofs dentry.
- * If the fs is busy update the expiry counter.
- */
- if (d_mountpoint(p)) {
- if (autofs_mount_busy(mnt, p)) {
- top_ino->last_used = jiffies;
- dput(p);
- return 1;
- }
- } else {
- struct autofs_info *ino = autofs_dentry_ino(p);
- unsigned int ino_count = atomic_read(&ino->count);
-
- /* allow for dget above and top is already dgot */
- if (p == top)
- ino_count += 2;
- else
- ino_count++;
-
- if (d_count(p) > ino_count) {
- top_ino->last_used = jiffies;
- dput(p);
- return 1;
- }
- }
- }
-
- /* Timeout of a tree mount is ultimately determined by its top dentry */
- if (!autofs_can_expire(top, timeout, do_now))
- return 1;
-
- return 0;
-}
-
-static struct dentry *autofs_check_leaves(struct vfsmount *mnt,
- struct dentry *parent,
- unsigned long timeout,
- int do_now)
-{
- struct dentry *p;
-
- pr_debug("parent %p %pd\n", parent, parent);
-
- p = NULL;
- while ((p = get_next_positive_dentry(p, parent))) {
- pr_debug("dentry %p %pd\n", p, p);
-
- if (d_mountpoint(p)) {
- /* Can we umount this guy */
- if (autofs_mount_busy(mnt, p))
- continue;
-
- /* Can we expire this guy */
- if (autofs_can_expire(p, timeout, do_now))
- return p;
- }
- }
- return NULL;
-}
-
-/* Check if we can expire a direct mount (possibly a tree) */
-struct dentry *autofs_expire_direct(struct super_block *sb,
- struct vfsmount *mnt,
- struct autofs_sb_info *sbi,
- int how)
-{
- unsigned long timeout;
- struct dentry *root = dget(sb->s_root);
- int do_now = how & AUTOFS_EXP_IMMEDIATE;
- struct autofs_info *ino;
-
- if (!root)
- return NULL;
-
- now = jiffies;
- timeout = sbi->exp_timeout;
-
- if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
- spin_lock(&sbi->fs_lock);
- ino = autofs_dentry_ino(root);
- /* No point expiring a pending mount */
- if (ino->flags & AUTOFS_INF_PENDING) {
- spin_unlock(&sbi->fs_lock);
- goto out;
- }
- ino->flags |= AUTOFS_INF_WANT_EXPIRE;
- spin_unlock(&sbi->fs_lock);
- synchronize_rcu();
- if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
- spin_lock(&sbi->fs_lock);
- ino->flags |= AUTOFS_INF_EXPIRING;
- init_completion(&ino->expire_complete);
- spin_unlock(&sbi->fs_lock);
- return root;
- }
- spin_lock(&sbi->fs_lock);
- ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
- spin_unlock(&sbi->fs_lock);
- }
-out:
- dput(root);
-
- return NULL;
-}
-
-/* Check if 'dentry' should expire, or return a nearby
- * dentry that is suitable.
- * If returned dentry is different from arg dentry,
- * then a dget() reference was taken, else not.
- */
-static struct dentry *should_expire(struct dentry *dentry,
- struct vfsmount *mnt,
- unsigned long timeout,
- int how)
-{
- int do_now = how & AUTOFS_EXP_IMMEDIATE;
- int exp_leaves = how & AUTOFS_EXP_LEAVES;
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- unsigned int ino_count;
-
- /* No point expiring a pending mount */
- if (ino->flags & AUTOFS_INF_PENDING)
- return NULL;
-
- /*
- * Case 1: (i) indirect mount or top level pseudo direct mount
- * (autofs-4.1).
- * (ii) indirect mount with offset mount, check the "/"
- * offset (autofs-5.0+).
- */
- if (d_mountpoint(dentry)) {
- pr_debug("checking mountpoint %p %pd\n", dentry, dentry);
-
- /* Can we umount this guy */
- if (autofs_mount_busy(mnt, dentry))
- return NULL;
-
- /* Can we expire this guy */
- if (autofs_can_expire(dentry, timeout, do_now))
- return dentry;
- return NULL;
- }
-
- if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
- pr_debug("checking symlink %p %pd\n", dentry, dentry);
- /*
- * A symlink can't be "busy" in the usual sense so
- * just check last used for expire timeout.
- */
- if (autofs_can_expire(dentry, timeout, do_now))
- return dentry;
- return NULL;
- }
-
- if (simple_empty(dentry))
- return NULL;
-
- /* Case 2: tree mount, expire iff entire tree is not busy */
- if (!exp_leaves) {
- /* Path walk currently on this dentry? */
- ino_count = atomic_read(&ino->count) + 1;
- if (d_count(dentry) > ino_count)
- return NULL;
-
- if (!autofs_tree_busy(mnt, dentry, timeout, do_now))
- return dentry;
- /*
- * Case 3: pseudo direct mount, expire individual leaves
- * (autofs-4.1).
- */
- } else {
- /* Path walk currently on this dentry? */
- struct dentry *expired;
-
- ino_count = atomic_read(&ino->count) + 1;
- if (d_count(dentry) > ino_count)
- return NULL;
-
- expired = autofs_check_leaves(mnt, dentry, timeout, do_now);
- if (expired) {
- if (expired == dentry)
- dput(dentry);
- return expired;
- }
- }
- return NULL;
-}
-
-/*
- * Find an eligible tree to time-out
- * A tree is eligible if :-
- * - it is unused by any user process
- * - it has been unused for exp_timeout time
- */
-struct dentry *autofs_expire_indirect(struct super_block *sb,
- struct vfsmount *mnt,
- struct autofs_sb_info *sbi,
- int how)
-{
- unsigned long timeout;
- struct dentry *root = sb->s_root;
- struct dentry *dentry;
- struct dentry *expired;
- struct dentry *found;
- struct autofs_info *ino;
-
- if (!root)
- return NULL;
-
- now = jiffies;
- timeout = sbi->exp_timeout;
-
- dentry = NULL;
- while ((dentry = get_next_positive_subdir(dentry, root))) {
- int flags = how;
-
- spin_lock(&sbi->fs_lock);
- ino = autofs_dentry_ino(dentry);
- if (ino->flags & AUTOFS_INF_WANT_EXPIRE) {
- spin_unlock(&sbi->fs_lock);
- continue;
- }
- spin_unlock(&sbi->fs_lock);
-
- expired = should_expire(dentry, mnt, timeout, flags);
- if (!expired)
- continue;
-
- spin_lock(&sbi->fs_lock);
- ino = autofs_dentry_ino(expired);
- ino->flags |= AUTOFS_INF_WANT_EXPIRE;
- spin_unlock(&sbi->fs_lock);
- synchronize_rcu();
-
- /* Make sure a reference is not taken on found if
- * things have changed.
- */
- flags &= ~AUTOFS_EXP_LEAVES;
- found = should_expire(expired, mnt, timeout, how);
- if (!found || found != expired)
- /* Something has changed, continue */
- goto next;
-
- if (expired != dentry)
- dput(dentry);
-
- spin_lock(&sbi->fs_lock);
- goto found;
-next:
- spin_lock(&sbi->fs_lock);
- ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
- spin_unlock(&sbi->fs_lock);
- if (expired != dentry)
- dput(expired);
- }
- return NULL;
-
-found:
- pr_debug("returning %p %pd\n", expired, expired);
- ino->flags |= AUTOFS_INF_EXPIRING;
- init_completion(&ino->expire_complete);
- spin_unlock(&sbi->fs_lock);
- return expired;
-}
-
-int autofs_expire_wait(const struct path *path, int rcu_walk)
-{
- struct dentry *dentry = path->dentry;
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- int status;
- int state;
-
- /* Block on any pending expire */
- if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE))
- return 0;
- if (rcu_walk)
- return -ECHILD;
-
-retry:
- spin_lock(&sbi->fs_lock);
- state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING);
- if (state == AUTOFS_INF_WANT_EXPIRE) {
- spin_unlock(&sbi->fs_lock);
- /*
- * Possibly being selected for expire, wait until
- * it's selected or not.
- */
- schedule_timeout_uninterruptible(HZ/10);
- goto retry;
- }
- if (state & AUTOFS_INF_EXPIRING) {
- spin_unlock(&sbi->fs_lock);
-
- pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);
-
- status = autofs_wait(sbi, path, NFY_NONE);
- wait_for_completion(&ino->expire_complete);
-
- pr_debug("expire done status=%d\n", status);
-
- if (d_unhashed(dentry))
- return -EAGAIN;
-
- return status;
- }
- spin_unlock(&sbi->fs_lock);
-
- return 0;
-}
-
-/* Perform an expiry operation */
-int autofs_expire_run(struct super_block *sb,
- struct vfsmount *mnt,
- struct autofs_sb_info *sbi,
- struct autofs_packet_expire __user *pkt_p)
-{
- struct autofs_packet_expire pkt;
- struct autofs_info *ino;
- struct dentry *dentry;
- int ret = 0;
-
- memset(&pkt, 0, sizeof(pkt));
-
- pkt.hdr.proto_version = sbi->version;
- pkt.hdr.type = autofs_ptype_expire;
-
- dentry = autofs_expire_indirect(sb, mnt, sbi, 0);
- if (!dentry)
- return -EAGAIN;
-
- pkt.len = dentry->d_name.len;
- memcpy(pkt.name, dentry->d_name.name, pkt.len);
- pkt.name[pkt.len] = '\0';
- dput(dentry);
-
- if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)))
- ret = -EFAULT;
-
- spin_lock(&sbi->fs_lock);
- ino = autofs_dentry_ino(dentry);
- /* avoid rapid-fire expire attempts if expiry fails */
- ino->last_used = now;
- ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
- complete_all(&ino->expire_complete);
- spin_unlock(&sbi->fs_lock);
-
- return ret;
-}
-
-int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
- struct autofs_sb_info *sbi, int when)
-{
- struct dentry *dentry;
- int ret = -EAGAIN;
-
- if (autofs_type_trigger(sbi->type))
- dentry = autofs_expire_direct(sb, mnt, sbi, when);
- else
- dentry = autofs_expire_indirect(sb, mnt, sbi, when);
-
- if (dentry) {
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- const struct path path = { .mnt = mnt, .dentry = dentry };
-
- /* This is synchronous because it makes the daemon a
- * little easier
- */
- ret = autofs_wait(sbi, &path, NFY_EXPIRE);
-
- spin_lock(&sbi->fs_lock);
- /* avoid rapid-fire expire attempts if expiry fails */
- ino->last_used = now;
- ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
- complete_all(&ino->expire_complete);
- spin_unlock(&sbi->fs_lock);
- dput(dentry);
- }
-
- return ret;
-}
-
-/*
- * Call repeatedly until it returns -EAGAIN, meaning there's nothing
- * more to be done.
- */
-int autofs_expire_multi(struct super_block *sb, struct vfsmount *mnt,
- struct autofs_sb_info *sbi, int __user *arg)
-{
- int do_now = 0;
-
- if (arg && get_user(do_now, arg))
- return -EFAULT;
-
- return autofs_do_expire_multi(sb, mnt, sbi, do_now);
-}
-
diff --git a/fs/autofs4/init.c b/fs/autofs4/init.c
deleted file mode 100644
index 16fb61315843..000000000000
--- a/fs/autofs4/init.c
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include "autofs_i.h"
-
-static struct dentry *autofs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
-{
- return mount_nodev(fs_type, flags, data, autofs_fill_super);
-}
-
-static struct file_system_type autofs_fs_type = {
- .owner = THIS_MODULE,
- .name = "autofs",
- .mount = autofs_mount,
- .kill_sb = autofs_kill_sb,
-};
-MODULE_ALIAS_FS("autofs");
-
-static int __init init_autofs_fs(void)
-{
- int err;
-
- autofs_dev_ioctl_init();
-
- err = register_filesystem(&autofs_fs_type);
- if (err)
- autofs_dev_ioctl_exit();
-
- return err;
-}
-
-static void __exit exit_autofs_fs(void)
-{
- autofs_dev_ioctl_exit();
- unregister_filesystem(&autofs_fs_type);
-}
-
-module_init(init_autofs_fs)
-module_exit(exit_autofs_fs)
-MODULE_LICENSE("GPL");
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
deleted file mode 100644
index 6262819ede45..000000000000
--- a/fs/autofs4/inode.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- * Copyright 2005-2006 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/file.h>
-#include <linux/seq_file.h>
-#include <linux/pagemap.h>
-#include <linux/parser.h>
-#include <linux/bitops.h>
-#include <linux/magic.h>
-#include "autofs_i.h"
-#include <linux/module.h>
-
-struct autofs_info *autofs_new_ino(struct autofs_sb_info *sbi)
-{
- struct autofs_info *ino;
-
- ino = kzalloc(sizeof(*ino), GFP_KERNEL);
- if (ino) {
- INIT_LIST_HEAD(&ino->active);
- INIT_LIST_HEAD(&ino->expiring);
- ino->last_used = jiffies;
- ino->sbi = sbi;
- }
- return ino;
-}
-
-void autofs_clean_ino(struct autofs_info *ino)
-{
- ino->uid = GLOBAL_ROOT_UID;
- ino->gid = GLOBAL_ROOT_GID;
- ino->last_used = jiffies;
-}
-
-void autofs_free_ino(struct autofs_info *ino)
-{
- kfree(ino);
-}
-
-void autofs_kill_sb(struct super_block *sb)
-{
- struct autofs_sb_info *sbi = autofs_sbi(sb);
-
- /*
- * In the event of a failure in get_sb_nodev the superblock
- * info is not present so nothing else has been setup, so
- * just call kill_anon_super when we are called from
- * deactivate_super.
- */
- if (sbi) {
- /* Free wait queues, close pipe */
- autofs_catatonic_mode(sbi);
- put_pid(sbi->oz_pgrp);
- }
-
- pr_debug("shutting down\n");
- kill_litter_super(sb);
- if (sbi)
- kfree_rcu(sbi, rcu);
-}
-
-static int autofs_show_options(struct seq_file *m, struct dentry *root)
-{
- struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
- struct inode *root_inode = d_inode(root->d_sb->s_root);
-
- if (!sbi)
- return 0;
-
- seq_printf(m, ",fd=%d", sbi->pipefd);
- if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
- seq_printf(m, ",uid=%u",
- from_kuid_munged(&init_user_ns, root_inode->i_uid));
- if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
- seq_printf(m, ",gid=%u",
- from_kgid_munged(&init_user_ns, root_inode->i_gid));
- seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
- seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
- seq_printf(m, ",minproto=%d", sbi->min_proto);
- seq_printf(m, ",maxproto=%d", sbi->max_proto);
-
- if (autofs_type_offset(sbi->type))
- seq_printf(m, ",offset");
- else if (autofs_type_direct(sbi->type))
- seq_printf(m, ",direct");
- else
- seq_printf(m, ",indirect");
-#ifdef CONFIG_CHECKPOINT_RESTORE
- if (sbi->pipe)
- seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
- else
- seq_printf(m, ",pipe_ino=-1");
-#endif
- return 0;
-}
-
-static void autofs_evict_inode(struct inode *inode)
-{
- clear_inode(inode);
- kfree(inode->i_private);
-}
-
-static const struct super_operations autofs_sops = {
- .statfs = simple_statfs,
- .show_options = autofs_show_options,
- .evict_inode = autofs_evict_inode,
-};
-
-enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
- Opt_indirect, Opt_direct, Opt_offset};
-
-static const match_table_t tokens = {
- {Opt_fd, "fd=%u"},
- {Opt_uid, "uid=%u"},
- {Opt_gid, "gid=%u"},
- {Opt_pgrp, "pgrp=%u"},
- {Opt_minproto, "minproto=%u"},
- {Opt_maxproto, "maxproto=%u"},
- {Opt_indirect, "indirect"},
- {Opt_direct, "direct"},
- {Opt_offset, "offset"},
- {Opt_err, NULL}
-};
-
-static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
- int *pgrp, bool *pgrp_set, unsigned int *type,
- int *minproto, int *maxproto)
-{
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
-
- *uid = current_uid();
- *gid = current_gid();
-
- *minproto = AUTOFS_MIN_PROTO_VERSION;
- *maxproto = AUTOFS_MAX_PROTO_VERSION;
-
- *pipefd = -1;
-
- if (!options)
- return 1;
-
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
-
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_fd:
- if (match_int(args, pipefd))
- return 1;
- break;
- case Opt_uid:
- if (match_int(args, &option))
- return 1;
- *uid = make_kuid(current_user_ns(), option);
- if (!uid_valid(*uid))
- return 1;
- break;
- case Opt_gid:
- if (match_int(args, &option))
- return 1;
- *gid = make_kgid(current_user_ns(), option);
- if (!gid_valid(*gid))
- return 1;
- break;
- case Opt_pgrp:
- if (match_int(args, &option))
- return 1;
- *pgrp = option;
- *pgrp_set = true;
- break;
- case Opt_minproto:
- if (match_int(args, &option))
- return 1;
- *minproto = option;
- break;
- case Opt_maxproto:
- if (match_int(args, &option))
- return 1;
- *maxproto = option;
- break;
- case Opt_indirect:
- set_autofs_type_indirect(type);
- break;
- case Opt_direct:
- set_autofs_type_direct(type);
- break;
- case Opt_offset:
- set_autofs_type_offset(type);
- break;
- default:
- return 1;
- }
- }
- return (*pipefd < 0);
-}
-
-int autofs_fill_super(struct super_block *s, void *data, int silent)
-{
- struct inode *root_inode;
- struct dentry *root;
- struct file *pipe;
- int pipefd;
- struct autofs_sb_info *sbi;
- struct autofs_info *ino;
- int pgrp = 0;
- bool pgrp_set = false;
- int ret = -EINVAL;
-
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
- pr_debug("starting up, sbi = %p\n", sbi);
-
- s->s_fs_info = sbi;
- sbi->magic = AUTOFS_SBI_MAGIC;
- sbi->pipefd = -1;
- sbi->pipe = NULL;
- sbi->catatonic = 1;
- sbi->exp_timeout = 0;
- sbi->oz_pgrp = NULL;
- sbi->sb = s;
- sbi->version = 0;
- sbi->sub_version = 0;
- set_autofs_type_indirect(&sbi->type);
- sbi->min_proto = 0;
- sbi->max_proto = 0;
- mutex_init(&sbi->wq_mutex);
- mutex_init(&sbi->pipe_mutex);
- spin_lock_init(&sbi->fs_lock);
- sbi->queues = NULL;
- spin_lock_init(&sbi->lookup_lock);
- INIT_LIST_HEAD(&sbi->active_list);
- INIT_LIST_HEAD(&sbi->expiring_list);
- s->s_blocksize = 1024;
- s->s_blocksize_bits = 10;
- s->s_magic = AUTOFS_SUPER_MAGIC;
- s->s_op = &autofs_sops;
- s->s_d_op = &autofs_dentry_operations;
- s->s_time_gran = 1;
-
- /*
- * Get the root inode and dentry, but defer checking for errors.
- */
- ino = autofs_new_ino(sbi);
- if (!ino) {
- ret = -ENOMEM;
- goto fail_free;
- }
- root_inode = autofs_get_inode(s, S_IFDIR | 0755);
- root = d_make_root(root_inode);
- if (!root)
- goto fail_ino;
- pipe = NULL;
-
- root->d_fsdata = ino;
-
- /* Can this call block? */
- if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
- &pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
- &sbi->max_proto)) {
- pr_err("called with bogus options\n");
- goto fail_dput;
- }
-
- /* Test versions first */
- if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
- sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
- pr_err("kernel does not match daemon version "
- "daemon (%d, %d) kernel (%d, %d)\n",
- sbi->min_proto, sbi->max_proto,
- AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
- goto fail_dput;
- }
-
- /* Establish highest kernel protocol version */
- if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
- sbi->version = AUTOFS_MAX_PROTO_VERSION;
- else
- sbi->version = sbi->max_proto;
- sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
-
- if (pgrp_set) {
- sbi->oz_pgrp = find_get_pid(pgrp);
- if (!sbi->oz_pgrp) {
- pr_err("could not find process group %d\n",
- pgrp);
- goto fail_dput;
- }
- } else {
- sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
- }
-
- if (autofs_type_trigger(sbi->type))
- __managed_dentry_set_managed(root);
-
- root_inode->i_fop = &autofs_root_operations;
- root_inode->i_op = &autofs_dir_inode_operations;
-
- pr_debug("pipe fd = %d, pgrp = %u\n", pipefd, pid_nr(sbi->oz_pgrp));
- pipe = fget(pipefd);
-
- if (!pipe) {
- pr_err("could not open pipe file descriptor\n");
- goto fail_put_pid;
- }
- ret = autofs_prepare_pipe(pipe);
- if (ret < 0)
- goto fail_fput;
- sbi->pipe = pipe;
- sbi->pipefd = pipefd;
- sbi->catatonic = 0;
-
- /*
- * Success! Install the root dentry now to indicate completion.
- */
- s->s_root = root;
- return 0;
-
- /*
- * Failure ... clean up.
- */
-fail_fput:
- pr_err("pipe file descriptor does not contain proper ops\n");
- fput(pipe);
-fail_put_pid:
- put_pid(sbi->oz_pgrp);
-fail_dput:
- dput(root);
- goto fail_free;
-fail_ino:
- autofs_free_ino(ino);
-fail_free:
- kfree(sbi);
- s->s_fs_info = NULL;
- return ret;
-}
-
-struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
-{
- struct inode *inode = new_inode(sb);
-
- if (inode == NULL)
- return NULL;
-
- inode->i_mode = mode;
- if (sb->s_root) {
- inode->i_uid = d_inode(sb->s_root)->i_uid;
- inode->i_gid = d_inode(sb->s_root)->i_gid;
- }
- inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
- inode->i_ino = get_next_ino();
-
- if (S_ISDIR(mode)) {
- set_nlink(inode, 2);
- inode->i_op = &autofs_dir_inode_operations;
- inode->i_fop = &autofs_dir_operations;
- } else if (S_ISLNK(mode)) {
- inode->i_op = &autofs_symlink_inode_operations;
- } else
- WARN_ON(1);
-
- return inode;
-}
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
deleted file mode 100644
index a4b36e44f73c..000000000000
--- a/fs/autofs4/root.c
+++ /dev/null
@@ -1,942 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
- * Copyright 2001-2006 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/capability.h>
-#include <linux/errno.h>
-#include <linux/stat.h>
-#include <linux/slab.h>
-#include <linux/param.h>
-#include <linux/time.h>
-#include <linux/compat.h>
-#include <linux/mutex.h>
-
-#include "autofs_i.h"
-
-static int autofs_dir_symlink(struct inode *, struct dentry *, const char *);
-static int autofs_dir_unlink(struct inode *, struct dentry *);
-static int autofs_dir_rmdir(struct inode *, struct dentry *);
-static int autofs_dir_mkdir(struct inode *, struct dentry *, umode_t);
-static long autofs_root_ioctl(struct file *, unsigned int, unsigned long);
-#ifdef CONFIG_COMPAT
-static long autofs_root_compat_ioctl(struct file *,
- unsigned int, unsigned long);
-#endif
-static int autofs_dir_open(struct inode *inode, struct file *file);
-static struct dentry *autofs_lookup(struct inode *,
- struct dentry *, unsigned int);
-static struct vfsmount *autofs_d_automount(struct path *);
-static int autofs_d_manage(const struct path *, bool);
-static void autofs_dentry_release(struct dentry *);
-
-const struct file_operations autofs_root_operations = {
- .open = dcache_dir_open,
- .release = dcache_dir_close,
- .read = generic_read_dir,
- .iterate_shared = dcache_readdir,
- .llseek = dcache_dir_lseek,
- .unlocked_ioctl = autofs_root_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = autofs_root_compat_ioctl,
-#endif
-};
-
-const struct file_operations autofs_dir_operations = {
- .open = autofs_dir_open,
- .release = dcache_dir_close,
- .read = generic_read_dir,
- .iterate_shared = dcache_readdir,
- .llseek = dcache_dir_lseek,
-};
-
-const struct inode_operations autofs_dir_inode_operations = {
- .lookup = autofs_lookup,
- .unlink = autofs_dir_unlink,
- .symlink = autofs_dir_symlink,
- .mkdir = autofs_dir_mkdir,
- .rmdir = autofs_dir_rmdir,
-};
-
-const struct dentry_operations autofs_dentry_operations = {
- .d_automount = autofs_d_automount,
- .d_manage = autofs_d_manage,
- .d_release = autofs_dentry_release,
-};
-
-static void autofs_add_active(struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino;
-
- ino = autofs_dentry_ino(dentry);
- if (ino) {
- spin_lock(&sbi->lookup_lock);
- if (!ino->active_count) {
- if (list_empty(&ino->active))
- list_add(&ino->active, &sbi->active_list);
- }
- ino->active_count++;
- spin_unlock(&sbi->lookup_lock);
- }
-}
-
-static void autofs_del_active(struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino;
-
- ino = autofs_dentry_ino(dentry);
- if (ino) {
- spin_lock(&sbi->lookup_lock);
- ino->active_count--;
- if (!ino->active_count) {
- if (!list_empty(&ino->active))
- list_del_init(&ino->active);
- }
- spin_unlock(&sbi->lookup_lock);
- }
-}
-
-static int autofs_dir_open(struct inode *inode, struct file *file)
-{
- struct dentry *dentry = file->f_path.dentry;
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
-
- pr_debug("file=%p dentry=%p %pd\n", file, dentry, dentry);
-
- if (autofs_oz_mode(sbi))
- goto out;
-
- /*
- * An empty directory in an autofs file system is always a
- * mount point. The daemon must have failed to mount this
- * during lookup so it doesn't exist. This can happen, for
- * example, if user space returns an incorrect status for a
- * mount request. Otherwise we're doing a readdir on the
- * autofs file system so just let the libfs routines handle
- * it.
- */
- spin_lock(&sbi->lookup_lock);
- if (!path_is_mountpoint(&file->f_path) && simple_empty(dentry)) {
- spin_unlock(&sbi->lookup_lock);
- return -ENOENT;
- }
- spin_unlock(&sbi->lookup_lock);
-
-out:
- return dcache_dir_open(inode, file);
-}
-
-static void autofs_dentry_release(struct dentry *de)
-{
- struct autofs_info *ino = autofs_dentry_ino(de);
- struct autofs_sb_info *sbi = autofs_sbi(de->d_sb);
-
- pr_debug("releasing %p\n", de);
-
- if (!ino)
- return;
-
- if (sbi) {
- spin_lock(&sbi->lookup_lock);
- if (!list_empty(&ino->active))
- list_del(&ino->active);
- if (!list_empty(&ino->expiring))
- list_del(&ino->expiring);
- spin_unlock(&sbi->lookup_lock);
- }
-
- autofs_free_ino(ino);
-}
-
-static struct dentry *autofs_lookup_active(struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct dentry *parent = dentry->d_parent;
- const struct qstr *name = &dentry->d_name;
- unsigned int len = name->len;
- unsigned int hash = name->hash;
- const unsigned char *str = name->name;
- struct list_head *p, *head;
-
- head = &sbi->active_list;
- if (list_empty(head))
- return NULL;
- spin_lock(&sbi->lookup_lock);
- list_for_each(p, head) {
- struct autofs_info *ino;
- struct dentry *active;
- const struct qstr *qstr;
-
- ino = list_entry(p, struct autofs_info, active);
- active = ino->dentry;
-
- spin_lock(&active->d_lock);
-
- /* Already gone? */
- if ((int) d_count(active) <= 0)
- goto next;
-
- qstr = &active->d_name;
-
- if (active->d_name.hash != hash)
- goto next;
- if (active->d_parent != parent)
- goto next;
-
- if (qstr->len != len)
- goto next;
- if (memcmp(qstr->name, str, len))
- goto next;
-
- if (d_unhashed(active)) {
- dget_dlock(active);
- spin_unlock(&active->d_lock);
- spin_unlock(&sbi->lookup_lock);
- return active;
- }
-next:
- spin_unlock(&active->d_lock);
- }
- spin_unlock(&sbi->lookup_lock);
-
- return NULL;
-}
-
-static struct dentry *autofs_lookup_expiring(struct dentry *dentry,
- bool rcu_walk)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct dentry *parent = dentry->d_parent;
- const struct qstr *name = &dentry->d_name;
- unsigned int len = name->len;
- unsigned int hash = name->hash;
- const unsigned char *str = name->name;
- struct list_head *p, *head;
-
- head = &sbi->expiring_list;
- if (list_empty(head))
- return NULL;
- spin_lock(&sbi->lookup_lock);
- list_for_each(p, head) {
- struct autofs_info *ino;
- struct dentry *expiring;
- const struct qstr *qstr;
-
- if (rcu_walk) {
- spin_unlock(&sbi->lookup_lock);
- return ERR_PTR(-ECHILD);
- }
-
- ino = list_entry(p, struct autofs_info, expiring);
- expiring = ino->dentry;
-
- spin_lock(&expiring->d_lock);
-
- /* We've already been dentry_iput or unlinked */
- if (d_really_is_negative(expiring))
- goto next;
-
- qstr = &expiring->d_name;
-
- if (expiring->d_name.hash != hash)
- goto next;
- if (expiring->d_parent != parent)
- goto next;
-
- if (qstr->len != len)
- goto next;
- if (memcmp(qstr->name, str, len))
- goto next;
-
- if (d_unhashed(expiring)) {
- dget_dlock(expiring);
- spin_unlock(&expiring->d_lock);
- spin_unlock(&sbi->lookup_lock);
- return expiring;
- }
-next:
- spin_unlock(&expiring->d_lock);
- }
- spin_unlock(&sbi->lookup_lock);
-
- return NULL;
-}
-
-static int autofs_mount_wait(const struct path *path, bool rcu_walk)
-{
- struct autofs_sb_info *sbi = autofs_sbi(path->dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(path->dentry);
- int status = 0;
-
- if (ino->flags & AUTOFS_INF_PENDING) {
- if (rcu_walk)
- return -ECHILD;
- pr_debug("waiting for mount name=%pd\n", path->dentry);
- status = autofs_wait(sbi, path, NFY_MOUNT);
- pr_debug("mount wait done status=%d\n", status);
- }
- ino->last_used = jiffies;
- return status;
-}
-
-static int do_expire_wait(const struct path *path, bool rcu_walk)
-{
- struct dentry *dentry = path->dentry;
- struct dentry *expiring;
-
- expiring = autofs_lookup_expiring(dentry, rcu_walk);
- if (IS_ERR(expiring))
- return PTR_ERR(expiring);
- if (!expiring)
- return autofs_expire_wait(path, rcu_walk);
- else {
- const struct path this = { .mnt = path->mnt, .dentry = expiring };
- /*
- * If we are racing with expire the request might not
- * be quite complete, but the directory has been removed
- * so it must have been successful, just wait for it.
- */
- autofs_expire_wait(&this, 0);
- autofs_del_expiring(expiring);
- dput(expiring);
- }
- return 0;
-}
-
-static struct dentry *autofs_mountpoint_changed(struct path *path)
-{
- struct dentry *dentry = path->dentry;
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
-
- /*
- * If this is an indirect mount the dentry could have gone away
- * as a result of an expire and a new one created.
- */
- if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
- struct dentry *parent = dentry->d_parent;
- struct autofs_info *ino;
- struct dentry *new;
-
- new = d_lookup(parent, &dentry->d_name);
- if (!new)
- return NULL;
- ino = autofs_dentry_ino(new);
- ino->last_used = jiffies;
- dput(path->dentry);
- path->dentry = new;
- }
- return path->dentry;
-}
-
-static struct vfsmount *autofs_d_automount(struct path *path)
-{
- struct dentry *dentry = path->dentry;
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- int status;
-
- pr_debug("dentry=%p %pd\n", dentry, dentry);
-
- /* The daemon never triggers a mount. */
- if (autofs_oz_mode(sbi))
- return NULL;
-
- /*
- * If an expire request is pending everyone must wait.
- * If the expire fails we're still mounted so continue
- * the follow and return. A return of -EAGAIN (which only
- * happens with indirect mounts) means the expire completed
- * and the directory was removed, so just go ahead and try
- * the mount.
- */
- status = do_expire_wait(path, 0);
- if (status && status != -EAGAIN)
- return NULL;
-
- /* Callback to the daemon to perform the mount or wait */
- spin_lock(&sbi->fs_lock);
- if (ino->flags & AUTOFS_INF_PENDING) {
- spin_unlock(&sbi->fs_lock);
- status = autofs_mount_wait(path, 0);
- if (status)
- return ERR_PTR(status);
- goto done;
- }
-
- /*
- * If the dentry is a symlink it's equivalent to a directory
- * having path_is_mountpoint() true, so there's no need to call
- * back to the daemon.
- */
- if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
- spin_unlock(&sbi->fs_lock);
- goto done;
- }
-
- if (!path_is_mountpoint(path)) {
- /*
- * It's possible that user space hasn't removed directories
- * after umounting a rootless multi-mount, although it
- * should. For v5 path_has_submounts() is sufficient to
- * handle this because the leaves of the directory tree under
- * the mount never trigger mounts themselves (they have an
- * autofs trigger mount mounted on them). But v4 pseudo direct
- * mounts do need the leaves to trigger mounts. In this case
- * we have no choice but to use the list_empty() check and
- * require user space behave.
- */
- if (sbi->version > 4) {
- if (path_has_submounts(path)) {
- spin_unlock(&sbi->fs_lock);
- goto done;
- }
- } else {
- if (!simple_empty(dentry)) {
- spin_unlock(&sbi->fs_lock);
- goto done;
- }
- }
- ino->flags |= AUTOFS_INF_PENDING;
- spin_unlock(&sbi->fs_lock);
- status = autofs_mount_wait(path, 0);
- spin_lock(&sbi->fs_lock);
- ino->flags &= ~AUTOFS_INF_PENDING;
- if (status) {
- spin_unlock(&sbi->fs_lock);
- return ERR_PTR(status);
- }
- }
- spin_unlock(&sbi->fs_lock);
-done:
- /* Mount succeeded, check if we ended up with a new dentry */
- dentry = autofs_mountpoint_changed(path);
- if (!dentry)
- return ERR_PTR(-ENOENT);
-
- return NULL;
-}
-
-static int autofs_d_manage(const struct path *path, bool rcu_walk)
-{
- struct dentry *dentry = path->dentry;
- struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- int status;
-
- pr_debug("dentry=%p %pd\n", dentry, dentry);
-
- /* The daemon never waits. */
- if (autofs_oz_mode(sbi)) {
- if (!path_is_mountpoint(path))
- return -EISDIR;
- return 0;
- }
-
- /* Wait for pending expires */
- if (do_expire_wait(path, rcu_walk) == -ECHILD)
- return -ECHILD;
-
- /*
- * This dentry may be under construction so wait on mount
- * completion.
- */
- status = autofs_mount_wait(path, rcu_walk);
- if (status)
- return status;
-
- if (rcu_walk) {
- /* We don't need fs_lock in rcu_walk mode,
- * just testing 'AUTOFS_INFO_NO_RCU' is enough.
- * simple_empty() takes a spinlock, so leave it
- * to last.
- * We only return -EISDIR when certain this isn't
- * a mount-trap.
- */
- struct inode *inode;
-
- if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
- return 0;
- if (path_is_mountpoint(path))
- return 0;
- inode = d_inode_rcu(dentry);
- if (inode && S_ISLNK(inode->i_mode))
- return -EISDIR;
- if (list_empty(&dentry->d_subdirs))
- return 0;
- if (!simple_empty(dentry))
- return -EISDIR;
- return 0;
- }
-
- spin_lock(&sbi->fs_lock);
- /*
- * If the dentry has been selected for expire while we slept
- * on the lock then it might go away. We'll deal with that in
- * ->d_automount() and wait on a new mount if the expire
- * succeeds or return here if it doesn't (since there's no
- * mount to follow with a rootless multi-mount).
- */
- if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
- /*
- * Any needed mounting has been completed and the path
- * updated so check if this is a rootless multi-mount so
- * we can avoid needless calls ->d_automount() and avoid
- * an incorrect ELOOP error return.
- */
- if ((!path_is_mountpoint(path) && !simple_empty(dentry)) ||
- (d_really_is_positive(dentry) && d_is_symlink(dentry)))
- status = -EISDIR;
- }
- spin_unlock(&sbi->fs_lock);
-
- return status;
-}
-
-/* Lookups in the root directory */
-static struct dentry *autofs_lookup(struct inode *dir,
- struct dentry *dentry, unsigned int flags)
-{
- struct autofs_sb_info *sbi;
- struct autofs_info *ino;
- struct dentry *active;
-
- pr_debug("name = %pd\n", dentry);
-
- /* File name too long to exist */
- if (dentry->d_name.len > NAME_MAX)
- return ERR_PTR(-ENAMETOOLONG);
-
- sbi = autofs_sbi(dir->i_sb);
-
- pr_debug("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
- current->pid, task_pgrp_nr(current), sbi->catatonic,
- autofs_oz_mode(sbi));
-
- active = autofs_lookup_active(dentry);
- if (active)
- return active;
- else {
- /*
- * A dentry that is not within the root can never trigger a
- * mount operation, unless the directory already exists, so we
- * can return fail immediately. The daemon however does need
- * to create directories within the file system.
- */
- if (!autofs_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
- return ERR_PTR(-ENOENT);
-
- /* Mark entries in the root as mount triggers */
- if (IS_ROOT(dentry->d_parent) &&
- autofs_type_indirect(sbi->type))
- __managed_dentry_set_managed(dentry);
-
- ino = autofs_new_ino(sbi);
- if (!ino)
- return ERR_PTR(-ENOMEM);
-
- dentry->d_fsdata = ino;
- ino->dentry = dentry;
-
- autofs_add_active(dentry);
- }
- return NULL;
-}
-
-static int autofs_dir_symlink(struct inode *dir,
- struct dentry *dentry,
- const char *symname)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- struct autofs_info *p_ino;
- struct inode *inode;
- size_t size = strlen(symname);
- char *cp;
-
- pr_debug("%s <- %pd\n", symname, dentry);
-
- if (!autofs_oz_mode(sbi))
- return -EACCES;
-
- BUG_ON(!ino);
-
- autofs_clean_ino(ino);
-
- autofs_del_active(dentry);
-
- cp = kmalloc(size + 1, GFP_KERNEL);
- if (!cp)
- return -ENOMEM;
-
- strcpy(cp, symname);
-
- inode = autofs_get_inode(dir->i_sb, S_IFLNK | 0555);
- if (!inode) {
- kfree(cp);
- return -ENOMEM;
- }
- inode->i_private = cp;
- inode->i_size = size;
- d_add(dentry, inode);
-
- dget(dentry);
- atomic_inc(&ino->count);
- p_ino = autofs_dentry_ino(dentry->d_parent);
- if (p_ino && !IS_ROOT(dentry))
- atomic_inc(&p_ino->count);
-
- dir->i_mtime = current_time(dir);
-
- return 0;
-}
-
-/*
- * NOTE!
- *
- * Normal filesystems would do a "d_delete()" to tell the VFS dcache
- * that the file no longer exists. However, doing that means that the
- * VFS layer can turn the dentry into a negative dentry. We don't want
- * this, because the unlink is probably the result of an expire.
- * We simply d_drop it and add it to a expiring list in the super block,
- * which allows the dentry lookup to check for an incomplete expire.
- *
- * If a process is blocked on the dentry waiting for the expire to finish,
- * it will invalidate the dentry and try to mount with a new one.
- *
- * Also see autofs_dir_rmdir()..
- */
-static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- struct autofs_info *p_ino;
-
- /* This allows root to remove symlinks */
- if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- if (atomic_dec_and_test(&ino->count)) {
- p_ino = autofs_dentry_ino(dentry->d_parent);
- if (p_ino && !IS_ROOT(dentry))
- atomic_dec(&p_ino->count);
- }
- dput(ino->dentry);
-
- d_inode(dentry)->i_size = 0;
- clear_nlink(d_inode(dentry));
-
- dir->i_mtime = current_time(dir);
-
- spin_lock(&sbi->lookup_lock);
- __autofs_add_expiring(dentry);
- d_drop(dentry);
- spin_unlock(&sbi->lookup_lock);
-
- return 0;
-}
-
-/*
- * Version 4 of autofs provides a pseudo direct mount implementation
- * that relies on directories at the leaves of a directory tree under
- * an indirect mount to trigger mounts. To allow for this we need to
- * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
- * of the directory tree. There is no need to clear the automount flag
- * following a mount or restore it after an expire because these mounts
- * are always covered. However, it is necessary to ensure that these
- * flags are clear on non-empty directories to avoid unnecessary calls
- * during path walks.
- */
-static void autofs_set_leaf_automount_flags(struct dentry *dentry)
-{
- struct dentry *parent;
-
- /* root and dentrys in the root are already handled */
- if (IS_ROOT(dentry->d_parent))
- return;
-
- managed_dentry_set_managed(dentry);
-
- parent = dentry->d_parent;
- /* only consider parents below dentrys in the root */
- if (IS_ROOT(parent->d_parent))
- return;
- managed_dentry_clear_managed(parent);
-}
-
-static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
-{
- struct list_head *d_child;
- struct dentry *parent;
-
- /* flags for dentrys in the root are handled elsewhere */
- if (IS_ROOT(dentry->d_parent))
- return;
-
- managed_dentry_clear_managed(dentry);
-
- parent = dentry->d_parent;
- /* only consider parents below dentrys in the root */
- if (IS_ROOT(parent->d_parent))
- return;
- d_child = &dentry->d_child;
- /* Set parent managed if it's becoming empty */
- if (d_child->next == &parent->d_subdirs &&
- d_child->prev == &parent->d_subdirs)
- managed_dentry_set_managed(parent);
-}
-
-static int autofs_dir_rmdir(struct inode *dir, struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- struct autofs_info *p_ino;
-
- pr_debug("dentry %p, removing %pd\n", dentry, dentry);
-
- if (!autofs_oz_mode(sbi))
- return -EACCES;
-
- spin_lock(&sbi->lookup_lock);
- if (!simple_empty(dentry)) {
- spin_unlock(&sbi->lookup_lock);
- return -ENOTEMPTY;
- }
- __autofs_add_expiring(dentry);
- d_drop(dentry);
- spin_unlock(&sbi->lookup_lock);
-
- if (sbi->version < 5)
- autofs_clear_leaf_automount_flags(dentry);
-
- if (atomic_dec_and_test(&ino->count)) {
- p_ino = autofs_dentry_ino(dentry->d_parent);
- if (p_ino && dentry->d_parent != dentry)
- atomic_dec(&p_ino->count);
- }
- dput(ino->dentry);
- d_inode(dentry)->i_size = 0;
- clear_nlink(d_inode(dentry));
-
- if (dir->i_nlink)
- drop_nlink(dir);
-
- return 0;
-}
-
-static int autofs_dir_mkdir(struct inode *dir,
- struct dentry *dentry, umode_t mode)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_info *ino = autofs_dentry_ino(dentry);
- struct autofs_info *p_ino;
- struct inode *inode;
-
- if (!autofs_oz_mode(sbi))
- return -EACCES;
-
- pr_debug("dentry %p, creating %pd\n", dentry, dentry);
-
- BUG_ON(!ino);
-
- autofs_clean_ino(ino);
-
- autofs_del_active(dentry);
-
- inode = autofs_get_inode(dir->i_sb, S_IFDIR | mode);
- if (!inode)
- return -ENOMEM;
- d_add(dentry, inode);
-
- if (sbi->version < 5)
- autofs_set_leaf_automount_flags(dentry);
-
- dget(dentry);
- atomic_inc(&ino->count);
- p_ino = autofs_dentry_ino(dentry->d_parent);
- if (p_ino && !IS_ROOT(dentry))
- atomic_inc(&p_ino->count);
- inc_nlink(dir);
- dir->i_mtime = current_time(dir);
-
- return 0;
-}
-
-/* Get/set timeout ioctl() operation */
-#ifdef CONFIG_COMPAT
-static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
- compat_ulong_t __user *p)
-{
- unsigned long ntimeout;
- int rv;
-
- rv = get_user(ntimeout, p);
- if (rv)
- goto error;
-
- rv = put_user(sbi->exp_timeout/HZ, p);
- if (rv)
- goto error;
-
- if (ntimeout > UINT_MAX/HZ)
- sbi->exp_timeout = 0;
- else
- sbi->exp_timeout = ntimeout * HZ;
-
- return 0;
-error:
- return rv;
-}
-#endif
-
-static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
- unsigned long __user *p)
-{
- unsigned long ntimeout;
- int rv;
-
- rv = get_user(ntimeout, p);
- if (rv)
- goto error;
-
- rv = put_user(sbi->exp_timeout/HZ, p);
- if (rv)
- goto error;
-
- if (ntimeout > ULONG_MAX/HZ)
- sbi->exp_timeout = 0;
- else
- sbi->exp_timeout = ntimeout * HZ;
-
- return 0;
-error:
- return rv;
-}
-
-/* Return protocol version */
-static inline int autofs_get_protover(struct autofs_sb_info *sbi,
- int __user *p)
-{
- return put_user(sbi->version, p);
-}
-
-/* Return protocol sub version */
-static inline int autofs_get_protosubver(struct autofs_sb_info *sbi,
- int __user *p)
-{
- return put_user(sbi->sub_version, p);
-}
-
-/*
-* Tells the daemon whether it can umount the autofs mount.
-*/
-static inline int autofs_ask_umount(struct vfsmount *mnt, int __user *p)
-{
- int status = 0;
-
- if (may_umount(mnt))
- status = 1;
-
- pr_debug("may umount %d\n", status);
-
- status = put_user(status, p);
-
- return status;
-}
-
-/* Identify autofs_dentries - this is so we can tell if there's
- * an extra dentry refcount or not. We only hold a refcount on the
- * dentry if its non-negative (ie, d_inode != NULL)
- */
-int is_autofs_dentry(struct dentry *dentry)
-{
- return dentry && d_really_is_positive(dentry) &&
- dentry->d_op == &autofs_dentry_operations &&
- dentry->d_fsdata != NULL;
-}
-
-/*
- * ioctl()'s on the root directory is the chief method for the daemon to
- * generate kernel reactions
- */
-static int autofs_root_ioctl_unlocked(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
- void __user *p = (void __user *)arg;
-
- pr_debug("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",
- cmd, arg, sbi, task_pgrp_nr(current));
-
- if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
- _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
- return -ENOTTY;
-
- if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- switch (cmd) {
- case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
- return autofs_wait_release(sbi, (autofs_wqt_t) arg, 0);
- case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
- return autofs_wait_release(sbi, (autofs_wqt_t) arg, -ENOENT);
- case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
- autofs_catatonic_mode(sbi);
- return 0;
- case AUTOFS_IOC_PROTOVER: /* Get protocol version */
- return autofs_get_protover(sbi, p);
- case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
- return autofs_get_protosubver(sbi, p);
- case AUTOFS_IOC_SETTIMEOUT:
- return autofs_get_set_timeout(sbi, p);
-#ifdef CONFIG_COMPAT
- case AUTOFS_IOC_SETTIMEOUT32:
- return autofs_compat_get_set_timeout(sbi, p);
-#endif
-
- case AUTOFS_IOC_ASKUMOUNT:
- return autofs_ask_umount(filp->f_path.mnt, p);
-
- /* return a single thing to expire */
- case AUTOFS_IOC_EXPIRE:
- return autofs_expire_run(inode->i_sb, filp->f_path.mnt, sbi, p);
- /* same as above, but can send multiple expires through pipe */
- case AUTOFS_IOC_EXPIRE_MULTI:
- return autofs_expire_multi(inode->i_sb,
- filp->f_path.mnt, sbi, p);
-
- default:
- return -EINVAL;
- }
-}
-
-static long autofs_root_ioctl(struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- struct inode *inode = file_inode(filp);
-
- return autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
-}
-
-#ifdef CONFIG_COMPAT
-static long autofs_root_compat_ioctl(struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- struct inode *inode = file_inode(filp);
- int ret;
-
- if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
- ret = autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
- else
- ret = autofs_root_ioctl_unlocked(inode, filp, cmd,
- (unsigned long) compat_ptr(arg));
-
- return ret;
-}
-#endif
diff --git a/fs/autofs4/symlink.c b/fs/autofs4/symlink.c
deleted file mode 100644
index aad3902c0cc1..000000000000
--- a/fs/autofs4/symlink.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include "autofs_i.h"
-
-static const char *autofs_get_link(struct dentry *dentry,
- struct inode *inode,
- struct delayed_call *done)
-{
- struct autofs_sb_info *sbi;
- struct autofs_info *ino;
-
- if (!dentry)
- return ERR_PTR(-ECHILD);
- sbi = autofs_sbi(dentry->d_sb);
- ino = autofs_dentry_ino(dentry);
- if (ino && !autofs_oz_mode(sbi))
- ino->last_used = jiffies;
- return d_inode(dentry)->i_private;
-}
-
-const struct inode_operations autofs_symlink_inode_operations = {
- .get_link = autofs_get_link
-};
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
deleted file mode 100644
index 8a566fa66afe..000000000000
--- a/fs/autofs4/waitq.c
+++ /dev/null
@@ -1,559 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- * Copyright 2001-2006 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/slab.h>
-#include <linux/time.h>
-#include <linux/signal.h>
-#include <linux/sched/signal.h>
-#include <linux/file.h>
-#include "autofs_i.h"
-
-/* We make this a static variable rather than a part of the superblock; it
- * is better if we don't reassign numbers easily even across filesystems
- */
-static autofs_wqt_t autofs_next_wait_queue = 1;
-
-void autofs_catatonic_mode(struct autofs_sb_info *sbi)
-{
- struct autofs_wait_queue *wq, *nwq;
-
- mutex_lock(&sbi->wq_mutex);
- if (sbi->catatonic) {
- mutex_unlock(&sbi->wq_mutex);
- return;
- }
-
- pr_debug("entering catatonic mode\n");
-
- sbi->catatonic = 1;
- wq = sbi->queues;
- sbi->queues = NULL; /* Erase all wait queues */
- while (wq) {
- nwq = wq->next;
- wq->status = -ENOENT; /* Magic is gone - report failure */
- kfree(wq->name.name);
- wq->name.name = NULL;
- wq->wait_ctr--;
- wake_up_interruptible(&wq->queue);
- wq = nwq;
- }
- fput(sbi->pipe); /* Close the pipe */
- sbi->pipe = NULL;
- sbi->pipefd = -1;
- mutex_unlock(&sbi->wq_mutex);
-}
-
-static int autofs_write(struct autofs_sb_info *sbi,
- struct file *file, const void *addr, int bytes)
-{
- unsigned long sigpipe, flags;
- const char *data = (const char *)addr;
- ssize_t wr = 0;
-
- sigpipe = sigismember(&current->pending.signal, SIGPIPE);
-
- mutex_lock(&sbi->pipe_mutex);
- while (bytes) {
- wr = __kernel_write(file, data, bytes, &file->f_pos);
- if (wr <= 0)
- break;
- data += wr;
- bytes -= wr;
- }
- mutex_unlock(&sbi->pipe_mutex);
-
- /* Keep the currently executing process from receiving a
- * SIGPIPE unless it was already supposed to get one
- */
- if (wr == -EPIPE && !sigpipe) {
- spin_lock_irqsave(&current->sighand->siglock, flags);
- sigdelset(&current->pending.signal, SIGPIPE);
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
- }
-
- /* if 'wr' returned 0 (impossible) we assume -EIO (safe) */
- return bytes == 0 ? 0 : wr < 0 ? wr : -EIO;
-}
-
-static void autofs_notify_daemon(struct autofs_sb_info *sbi,
- struct autofs_wait_queue *wq,
- int type)
-{
- union {
- struct autofs_packet_hdr hdr;
- union autofs_packet_union v4_pkt;
- union autofs_v5_packet_union v5_pkt;
- } pkt;
- struct file *pipe = NULL;
- size_t pktsz;
- int ret;
-
- pr_debug("wait id = 0x%08lx, name = %.*s, type=%d\n",
- (unsigned long) wq->wait_queue_token,
- wq->name.len, wq->name.name, type);
-
- memset(&pkt, 0, sizeof(pkt)); /* For security reasons */
-
- pkt.hdr.proto_version = sbi->version;
- pkt.hdr.type = type;
-
- switch (type) {
- /* Kernel protocol v4 missing and expire packets */
- case autofs_ptype_missing:
- {
- struct autofs_packet_missing *mp = &pkt.v4_pkt.missing;
-
- pktsz = sizeof(*mp);
-
- mp->wait_queue_token = wq->wait_queue_token;
- mp->len = wq->name.len;
- memcpy(mp->name, wq->name.name, wq->name.len);
- mp->name[wq->name.len] = '\0';
- break;
- }
- case autofs_ptype_expire_multi:
- {
- struct autofs_packet_expire_multi *ep =
- &pkt.v4_pkt.expire_multi;
-
- pktsz = sizeof(*ep);
-
- ep->wait_queue_token = wq->wait_queue_token;
- ep->len = wq->name.len;
- memcpy(ep->name, wq->name.name, wq->name.len);
- ep->name[wq->name.len] = '\0';
- break;
- }
- /*
- * Kernel protocol v5 packet for handling indirect and direct
- * mount missing and expire requests
- */
- case autofs_ptype_missing_indirect:
- case autofs_ptype_expire_indirect:
- case autofs_ptype_missing_direct:
- case autofs_ptype_expire_direct:
- {
- struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet;
- struct user_namespace *user_ns = sbi->pipe->f_cred->user_ns;
-
- pktsz = sizeof(*packet);
-
- packet->wait_queue_token = wq->wait_queue_token;
- packet->len = wq->name.len;
- memcpy(packet->name, wq->name.name, wq->name.len);
- packet->name[wq->name.len] = '\0';
- packet->dev = wq->dev;
- packet->ino = wq->ino;
- packet->uid = from_kuid_munged(user_ns, wq->uid);
- packet->gid = from_kgid_munged(user_ns, wq->gid);
- packet->pid = wq->pid;
- packet->tgid = wq->tgid;
- break;
- }
- default:
- pr_warn("bad type %d!\n", type);
- mutex_unlock(&sbi->wq_mutex);
- return;
- }
-
- pipe = get_file(sbi->pipe);
-
- mutex_unlock(&sbi->wq_mutex);
-
- switch (ret = autofs_write(sbi, pipe, &pkt, pktsz)) {
- case 0:
- break;
- case -ENOMEM:
- case -ERESTARTSYS:
- /* Just fail this one */
- autofs_wait_release(sbi, wq->wait_queue_token, ret);
- break;
- default:
- autofs_catatonic_mode(sbi);
- break;
- }
- fput(pipe);
-}
-
-static int autofs_getpath(struct autofs_sb_info *sbi,
- struct dentry *dentry, char **name)
-{
- struct dentry *root = sbi->sb->s_root;
- struct dentry *tmp;
- char *buf;
- char *p;
- int len;
- unsigned seq;
-
-rename_retry:
- buf = *name;
- len = 0;
-
- seq = read_seqbegin(&rename_lock);
- rcu_read_lock();
- spin_lock(&sbi->fs_lock);
- for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
- len += tmp->d_name.len + 1;
-
- if (!len || --len > NAME_MAX) {
- spin_unlock(&sbi->fs_lock);
- rcu_read_unlock();
- if (read_seqretry(&rename_lock, seq))
- goto rename_retry;
- return 0;
- }
-
- *(buf + len) = '\0';
- p = buf + len - dentry->d_name.len;
- strncpy(p, dentry->d_name.name, dentry->d_name.len);
-
- for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) {
- *(--p) = '/';
- p -= tmp->d_name.len;
- strncpy(p, tmp->d_name.name, tmp->d_name.len);
- }
- spin_unlock(&sbi->fs_lock);
- rcu_read_unlock();
- if (read_seqretry(&rename_lock, seq))
- goto rename_retry;
-
- return len;
-}
-
-static struct autofs_wait_queue *
-autofs_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
-{
- struct autofs_wait_queue *wq;
-
- for (wq = sbi->queues; wq; wq = wq->next) {
- if (wq->name.hash == qstr->hash &&
- wq->name.len == qstr->len &&
- wq->name.name &&
- !memcmp(wq->name.name, qstr->name, qstr->len))
- break;
- }
- return wq;
-}
-
-/*
- * Check if we have a valid request.
- * Returns
- * 1 if the request should continue.
- * In this case we can return an autofs_wait_queue entry if one is
- * found or NULL to idicate a new wait needs to be created.
- * 0 or a negative errno if the request shouldn't continue.
- */
-static int validate_request(struct autofs_wait_queue **wait,
- struct autofs_sb_info *sbi,
- const struct qstr *qstr,
- const struct path *path, enum autofs_notify notify)
-{
- struct dentry *dentry = path->dentry;
- struct autofs_wait_queue *wq;
- struct autofs_info *ino;
-
- if (sbi->catatonic)
- return -ENOENT;
-
- /* Wait in progress, continue; */
- wq = autofs_find_wait(sbi, qstr);
- if (wq) {
- *wait = wq;
- return 1;
- }
-
- *wait = NULL;
-
- /* If we don't yet have any info this is a new request */
- ino = autofs_dentry_ino(dentry);
- if (!ino)
- return 1;
-
- /*
- * If we've been asked to wait on an existing expire (NFY_NONE)
- * but there is no wait in the queue ...
- */
- if (notify == NFY_NONE) {
- /*
- * Either we've betean the pending expire to post it's
- * wait or it finished while we waited on the mutex.
- * So we need to wait till either, the wait appears
- * or the expire finishes.
- */
-
- while (ino->flags & AUTOFS_INF_EXPIRING) {
- mutex_unlock(&sbi->wq_mutex);
- schedule_timeout_interruptible(HZ/10);
- if (mutex_lock_interruptible(&sbi->wq_mutex))
- return -EINTR;
-
- if (sbi->catatonic)
- return -ENOENT;
-
- wq = autofs_find_wait(sbi, qstr);
- if (wq) {
- *wait = wq;
- return 1;
- }
- }
-
- /*
- * Not ideal but the status has already gone. Of the two
- * cases where we wait on NFY_NONE neither depend on the
- * return status of the wait.
- */
- return 0;
- }
-
- /*
- * If we've been asked to trigger a mount and the request
- * completed while we waited on the mutex ...
- */
- if (notify == NFY_MOUNT) {
- struct dentry *new = NULL;
- struct path this;
- int valid = 1;
-
- /*
- * If the dentry was successfully mounted while we slept
- * on the wait queue mutex we can return success. If it
- * isn't mounted (doesn't have submounts for the case of
- * a multi-mount with no mount at it's base) we can
- * continue on and create a new request.
- */
- if (!IS_ROOT(dentry)) {
- if (d_unhashed(dentry) &&
- d_really_is_positive(dentry)) {
- struct dentry *parent = dentry->d_parent;
-
- new = d_lookup(parent, &dentry->d_name);
- if (new)
- dentry = new;
- }
- }
- this.mnt = path->mnt;
- this.dentry = dentry;
- if (path_has_submounts(&this))
- valid = 0;
-
- if (new)
- dput(new);
- return valid;
- }
-
- return 1;
-}
-
-int autofs_wait(struct autofs_sb_info *sbi,
- const struct path *path, enum autofs_notify notify)
-{
- struct dentry *dentry = path->dentry;
- struct autofs_wait_queue *wq;
- struct qstr qstr;
- char *name;
- int status, ret, type;
- pid_t pid;
- pid_t tgid;
-
- /* In catatonic mode, we don't wait for nobody */
- if (sbi->catatonic)
- return -ENOENT;
-
- /*
- * Try translating pids to the namespace of the daemon.
- *
- * Zero means failure: we are in an unrelated pid namespace.
- */
- pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp));
- tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp));
- if (pid == 0 || tgid == 0)
- return -ENOENT;
-
- if (d_really_is_negative(dentry)) {
- /*
- * A wait for a negative dentry is invalid for certain
- * cases. A direct or offset mount "always" has its mount
- * point directory created and so the request dentry must
- * be positive or the map key doesn't exist. The situation
- * is very similar for indirect mounts except only dentrys
- * in the root of the autofs file system may be negative.
- */
- if (autofs_type_trigger(sbi->type))
- return -ENOENT;
- else if (!IS_ROOT(dentry->d_parent))
- return -ENOENT;
- }
-
- name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
- if (!name)
- return -ENOMEM;
-
- /* If this is a direct mount request create a dummy name */
- if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type))
- qstr.len = sprintf(name, "%p", dentry);
- else {
- qstr.len = autofs_getpath(sbi, dentry, &name);
- if (!qstr.len) {
- kfree(name);
- return -ENOENT;
- }
- }
- qstr.name = name;
- qstr.hash = full_name_hash(dentry, name, qstr.len);
-
- if (mutex_lock_interruptible(&sbi->wq_mutex)) {
- kfree(qstr.name);
- return -EINTR;
- }
-
- ret = validate_request(&wq, sbi, &qstr, path, notify);
- if (ret <= 0) {
- if (ret != -EINTR)
- mutex_unlock(&sbi->wq_mutex);
- kfree(qstr.name);
- return ret;
- }
-
- if (!wq) {
- /* Create a new wait queue */
- wq = kmalloc(sizeof(struct autofs_wait_queue), GFP_KERNEL);
- if (!wq) {
- kfree(qstr.name);
- mutex_unlock(&sbi->wq_mutex);
- return -ENOMEM;
- }
-
- wq->wait_queue_token = autofs_next_wait_queue;
- if (++autofs_next_wait_queue == 0)
- autofs_next_wait_queue = 1;
- wq->next = sbi->queues;
- sbi->queues = wq;
- init_waitqueue_head(&wq->queue);
- memcpy(&wq->name, &qstr, sizeof(struct qstr));
- wq->dev = autofs_get_dev(sbi);
- wq->ino = autofs_get_ino(sbi);
- wq->uid = current_uid();
- wq->gid = current_gid();
- wq->pid = pid;
- wq->tgid = tgid;
- wq->status = -EINTR; /* Status return if interrupted */
- wq->wait_ctr = 2;
-
- if (sbi->version < 5) {
- if (notify == NFY_MOUNT)
- type = autofs_ptype_missing;
- else
- type = autofs_ptype_expire_multi;
- } else {
- if (notify == NFY_MOUNT)
- type = autofs_type_trigger(sbi->type) ?
- autofs_ptype_missing_direct :
- autofs_ptype_missing_indirect;
- else
- type = autofs_type_trigger(sbi->type) ?
- autofs_ptype_expire_direct :
- autofs_ptype_expire_indirect;
- }
-
- pr_debug("new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
- (unsigned long) wq->wait_queue_token, wq->name.len,
- wq->name.name, notify);
-
- /*
- * autofs_notify_daemon() may block; it will unlock ->wq_mutex
- */
- autofs_notify_daemon(sbi, wq, type);
- } else {
- wq->wait_ctr++;
- pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n",
- (unsigned long) wq->wait_queue_token, wq->name.len,
- wq->name.name, notify);
- mutex_unlock(&sbi->wq_mutex);
- kfree(qstr.name);
- }
-
- /*
- * wq->name.name is NULL iff the lock is already released
- * or the mount has been made catatonic.
- */
- wait_event_killable(wq->queue, wq->name.name == NULL);
- status = wq->status;
-
- /*
- * For direct and offset mounts we need to track the requester's
- * uid and gid in the dentry info struct. This is so it can be
- * supplied, on request, by the misc device ioctl interface.
- * This is needed during daemon resatart when reconnecting
- * to existing, active, autofs mounts. The uid and gid (and
- * related string values) may be used for macro substitution
- * in autofs mount maps.
- */
- if (!status) {
- struct autofs_info *ino;
- struct dentry *de = NULL;
-
- /* direct mount or browsable map */
- ino = autofs_dentry_ino(dentry);
- if (!ino) {
- /* If not lookup actual dentry used */
- de = d_lookup(dentry->d_parent, &dentry->d_name);
- if (de)
- ino = autofs_dentry_ino(de);
- }
-
- /* Set mount requester */
- if (ino) {
- spin_lock(&sbi->fs_lock);
- ino->uid = wq->uid;
- ino->gid = wq->gid;
- spin_unlock(&sbi->fs_lock);
- }
-
- if (de)
- dput(de);
- }
-
- /* Are we the last process to need status? */
- mutex_lock(&sbi->wq_mutex);
- if (!--wq->wait_ctr)
- kfree(wq);
- mutex_unlock(&sbi->wq_mutex);
-
- return status;
-}
-
-
-int autofs_wait_release(struct autofs_sb_info *sbi,
- autofs_wqt_t wait_queue_token, int status)
-{
- struct autofs_wait_queue *wq, **wql;
-
- mutex_lock(&sbi->wq_mutex);
- for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
- if (wq->wait_queue_token == wait_queue_token)
- break;
- }
-
- if (!wq) {
- mutex_unlock(&sbi->wq_mutex);
- return -EINVAL;
- }
-
- *wql = wq->next; /* Unlink from chain */
- kfree(wq->name.name);
- wq->name.name = NULL; /* Do not wait on this queue */
- wq->status = status;
- wake_up(&wq->queue);
- if (!--wq->wait_ctr)
- kfree(wq);
- mutex_unlock(&sbi->wq_mutex);
-
- return 0;
-}
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