// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
* Copyright 1999-2000 Jeremy Fitzhardinge <[email protected]>
* Copyright 2001-2006 Ian Kent <[email protected]>
*/
#include <linux/capability.h>
#include <linux/compat.h>
#include "autofs_i.h"
static int autofs_dir_permission(struct mnt_idmap *, struct inode *, int);
static int autofs_dir_symlink(struct mnt_idmap *, 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 mnt_idmap *, 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,
.permission = autofs_dir_permission,
.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_del_active(struct dentry *dentry)
{
struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
struct autofs_info *ino;
ino = autofs_dentry_ino(dentry);
spin_lock(&sbi->lookup_lock);
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);
struct autofs_info *ino = autofs_dentry_ino(dentry);
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) && autofs_empty(ino)) {
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;
}
if (!(sbi->flags & AUTOFS_SBI_STRICTEXPIRE))
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
* and a new one created.
*
* This is unusual and I can't remember the case for which it
* was originally added now. But an example of how this can
* happen is an autofs indirect mount that has the "browse"
* option set and also has the "symlink" option in the autofs
* map entry. In this case the daemon will remove the browse
* directory and create a symlink as the mount leaving the
* struct path stale.
*
* Another not so obvious case is when a mount in an autofs
* indirect mount that uses the "nobrowse" option is being
* expired at the same time as a path walk. If the mount has
* been umounted but the mount point directory seen before
* becoming unhashed (during a lockless path walk) when a stat
* family system call is made the mount won't be re-mounted as
* it should. In this case the mount point that's been removed
* (by the daemon) will be stale and the a new mount point
* dentry 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 autofs_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 (!autofs_empty(ino)) {
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_INF_WANT_EXPIRE' is enough.
*
* 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 (!autofs_empty(ino))
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) && !autofs_empty(ino)) ||
(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->flags & AUTOFS_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);
ino = autofs_new_ino(sbi);
if (!ino)
return ERR_PTR(-ENOMEM);
spin_lock(&sbi->lookup_lock);
spin_lock(&dentry->d_lock);
/* Mark entries in the root as mount triggers */
if (IS_ROOT(dentry->d_parent) &&
autofs_type_indirect(sbi->type))
__managed_dentry_set_managed(dentry);
dentry->d_fsdata = ino;
ino->dentry = dentry;
list_add(&ino->active, &sbi->active_list);
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dentry->d_lock);
}
return NULL;
}
static int autofs_dir_permission(struct mnt_idmap *idmap,
struct inode *inode, int mask)
{
if (mask & MAY_WRITE) {
struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
if (!autofs_oz_mode(sbi))
return -EACCES;
/* autofs_oz_mode() needs to allow path walks when the
* autofs mount is catatonic but the state of an autofs
* file system needs to be preserved over restarts.
*/
if (sbi->flags & AUTOFS_SBI_CATATONIC)
return -EACCES;
}
return generic_permission(idmap, inode, mask);
}
static int autofs_dir_symlink(struct mnt_idmap *idmap,
struct inode *dir, struct dentry *dentry,
const char *symname)
{
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);
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);
p_ino = autofs_dentry_ino(dentry->d_parent);
p_ino->count++;
inode_set_mtime_to_ts(dir, inode_set_ctime_current(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;
p_ino = autofs_dentry_ino(dentry->d_parent);
p_ino->count--;
dput(ino->dentry);
d_inode(dentry)->i_size = 0;
clear_nlink(d_inode(dentry));
inode_set_mtime_to_ts(dir, inode_set_ctime_current(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 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;
if (autofs_dentry_ino(parent)->count == 2)
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 (ino->count != 1)
return -ENOTEMPTY;
spin_lock(&sbi->lookup_lock);
__autofs_add_expiring(dentry);
d_drop(dentry);
spin_unlock(&sbi->lookup_lock);
if (sbi->version < 5)
autofs_clear_leaf_automount_flags(dentry);
p_ino = autofs_dentry_ino(dentry->d_parent);
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 mnt_idmap *idmap,
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;
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);
p_ino = autofs_dentry_ino(dentry->d_parent);
p_ino->count++;
inc_nlink(dir);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(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
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