Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
 */
 
#include <linux/capability.h>
#include <linux/compat.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_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);
 
<------>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;
<------>}
<------>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
<------> * 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->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_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;
 
<------>/* 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;
 
<------>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);
<------>ino->count++;
<------>p_ino = autofs_dentry_ino(dentry->d_parent);
<------>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;
 
<------>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;
 
<------>ino->count--;
<------>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));
 
<------>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 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 (!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;
 
<------>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);
 
<------>ino->count--;
<------>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 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;
 
<------>/* 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;
 
<------>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);
<------>ino->count++;
<------>p_ino = autofs_dentry_ino(dentry->d_parent);
<------>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