diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/autofs4/autofs_i.h | 273 | ||||
| -rw-r--r-- | fs/autofs4/dev-ioctl.c | 761 | ||||
| -rw-r--r-- | fs/autofs4/expire.c | 632 | ||||
| -rw-r--r-- | fs/autofs4/init.c | 48 | ||||
| -rw-r--r-- | fs/autofs4/inode.c | 375 | ||||
| -rw-r--r-- | fs/autofs4/root.c | 942 | ||||
| -rw-r--r-- | fs/autofs4/symlink.c | 29 | ||||
| -rw-r--r-- | fs/autofs4/waitq.c | 559 |
8 files changed, 0 insertions, 3619 deletions
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(¤t->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(¤t->sighand->siglock, flags); - sigdelset(¤t->pending.signal, SIGPIPE); - recalc_sigpending(); - spin_unlock_irqrestore(¤t->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; -} |