fs/ecryptfs/file.c - maze/linux - Git at Google

 /**
  * eCryptfs: Linux filesystem encryption layer
  *
  * Copyright (C) 1997-2004 Erez Zadok
  * Copyright (C) 2001-2004 Stony Brook University
  * Copyright (C) 2004-2007 International Business Machines Corp.
  *   Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
  *   		Michael C. Thompson <mcthomps@us.ibm.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the
  * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  * 02111-1307, USA.
  */

 #include <linux/file.h>
 #include <linux/poll.h>
 #include <linux/mount.h>
 #include <linux/pagemap.h>
 #include <linux/security.h>
 #include <linux/compat.h>
 #include <linux/fs_stack.h>
 #include "ecryptfs_kernel.h"

 /**
  * ecryptfs_read_update_atime
  *
  * generic_file_read updates the atime of upper layer inode.  But, it
  * doesn't give us a chance to update the atime of the lower layer
  * inode.  This function is a wrapper to generic_file_read.  It
  * updates the atime of the lower level inode if generic_file_read
  * returns without any errors. This is to be used only for file reads.
  * The function to be used for directory reads is ecryptfs_read.
  */
 static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
 				const struct iovec *iov,
 				unsigned long nr_segs, loff_t pos)
 {
 	int rc;
 	struct dentry *lower_dentry;
 	struct vfsmount *lower_vfsmount;
 	struct file *file = iocb->ki_filp;

 	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
 	/*
 	 * Even though this is a async interface, we need to wait
 	 * for IO to finish to update atime
 	 */
 	if (-EIOCBQUEUED == rc)
 		rc = wait_on_sync_kiocb(iocb);
 	if (rc >= 0) {
 		lower_dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
 		lower_vfsmount = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
 		touch_atime(lower_vfsmount, lower_dentry);
 	}
 	return rc;
 }

 struct ecryptfs_getdents_callback {
 	void *dirent;
 	struct dentry *dentry;
 	filldir_t filldir;
 	int err;
 	int filldir_called;
 	int entries_written;
 };

 /* Inspired by generic filldir in fs/readir.c */
 static int
 ecryptfs_filldir(void *dirent, const char *name, int namelen, loff_t offset,
 		 u64 ino, unsigned int d_type)
 {
 	struct ecryptfs_crypt_stat *crypt_stat;
 	struct ecryptfs_getdents_callback *buf =
 	    (struct ecryptfs_getdents_callback *)dirent;
 	int rc;
 	int decoded_length;
 	char *decoded_name;

 	crypt_stat = ecryptfs_dentry_to_private(buf->dentry)->crypt_stat;
 	buf->filldir_called++;
 	decoded_length = ecryptfs_decode_filename(crypt_stat, name, namelen,
 						  &decoded_name);
 	if (decoded_length < 0) {
 		rc = decoded_length;
 		goto out;
 	}
 	rc = buf->filldir(buf->dirent, decoded_name, decoded_length, offset,
 			  ino, d_type);
 	kfree(decoded_name);
 	if (rc >= 0)
 		buf->entries_written++;
 out:
 	return rc;
 }

 /**
  * ecryptfs_readdir
  * @file: The ecryptfs file struct
  * @dirent: Directory entry
  * @filldir: The filldir callback function
  */
 static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 {
 	int rc;
 	struct file *lower_file;
 	struct inode *inode;
 	struct ecryptfs_getdents_callback buf;

 	lower_file = ecryptfs_file_to_lower(file);
 	lower_file->f_pos = file->f_pos;
 	inode = file->f_path.dentry->d_inode;
 	memset(&buf, 0, sizeof(buf));
 	buf.dirent = dirent;
 	buf.dentry = file->f_path.dentry;
 	buf.filldir = filldir;
 retry:
 	buf.filldir_called = 0;
 	buf.entries_written = 0;
 	buf.err = 0;
 	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
 	if (buf.err)
 		rc = buf.err;
 	if (buf.filldir_called && !buf.entries_written)
 		goto retry;
 	file->f_pos = lower_file->f_pos;
 	if (rc >= 0)
 		fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
 	return rc;
 }

 struct kmem_cache *ecryptfs_file_info_cache;

 int ecryptfs_open_lower_file(struct file **lower_file,
 			     struct dentry *lower_dentry,
 			     struct vfsmount *lower_mnt, int flags)
 {
 	int rc = 0;

 	flags |= O_LARGEFILE;
 	dget(lower_dentry);
 	mntget(lower_mnt);
 	*lower_file = dentry_open(lower_dentry, lower_mnt, flags);
 	if (IS_ERR(*lower_file)) {
 		printk(KERN_ERR "Error opening lower file for lower_dentry "
 		       "[0x%p], lower_mnt [0x%p], and flags [0x%x]\n",
 		       lower_dentry, lower_mnt, flags);
 		rc = PTR_ERR(*lower_file);
 		*lower_file = NULL;
 		goto out;
 	}
 out:
 	return rc;
 }

 int ecryptfs_close_lower_file(struct file *lower_file)
 {
 	fput(lower_file);
 	return 0;
 }

 /**
  * ecryptfs_open
  * @inode: inode speciying file to open
  * @file: Structure to return filled in
  *
  * Opens the file specified by inode.
  *
  * Returns zero on success; non-zero otherwise
  */
 static int ecryptfs_open(struct inode *inode, struct file *file)
 {
 	int rc = 0;
 	struct ecryptfs_crypt_stat *crypt_stat = NULL;
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 	struct dentry *ecryptfs_dentry = file->f_path.dentry;
 	/* Private value of ecryptfs_dentry allocated in
 	 * ecryptfs_lookup() */
 	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 	struct inode *lower_inode = NULL;
 	struct file *lower_file = NULL;
 	struct vfsmount *lower_mnt;
 	struct ecryptfs_file_info *file_info;
 	int lower_flags;

 	mount_crypt_stat = &ecryptfs_superblock_to_private(
 		ecryptfs_dentry->d_sb)->mount_crypt_stat;
 	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
 	    && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
 		|| (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
 		|| (file->f_flags & O_APPEND))) {
 		printk(KERN_WARNING "Mount has encrypted view enabled; "
 		       "files may only be read\n");
 		rc = -EPERM;
 		goto out;
 	}
 	/* Released in ecryptfs_release or end of function if failure */
 	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
 	ecryptfs_set_file_private(file, file_info);
 	if (!file_info) {
 		ecryptfs_printk(KERN_ERR,
 				"Error attempting to allocate memory\n");
 		rc = -ENOMEM;
 		goto out;
 	}
 	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 	mutex_lock(&crypt_stat->cs_mutex);
 	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
 		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
 		/* Policy code enabled in future release */
 		crypt_stat->flags |= ECRYPTFS_POLICY_APPLIED;
 		crypt_stat->flags |= ECRYPTFS_ENCRYPTED;
 	}
 	mutex_unlock(&crypt_stat->cs_mutex);
 	lower_flags = file->f_flags;
 	if ((lower_flags & O_ACCMODE) == O_WRONLY)
 		lower_flags = (lower_flags & O_ACCMODE) | O_RDWR;
 	if (file->f_flags & O_APPEND)
 		lower_flags &= ~O_APPEND;
 	lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
 	/* Corresponding fput() in ecryptfs_release() */
 	rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt,
 				      lower_flags);
 	if (rc) {
 		ecryptfs_printk(KERN_ERR, "Error opening lower file\n");
 		goto out_puts;
 	}
 	ecryptfs_set_file_lower(file, lower_file);
 	/* Isn't this check the same as the one in lookup? */
 	lower_inode = lower_dentry->d_inode;
 	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 		rc = 0;
 		goto out;
 	}
 	mutex_lock(&crypt_stat->cs_mutex);
 	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 	    || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
 		rc = ecryptfs_read_metadata(ecryptfs_dentry, lower_file);
 		if (rc) {
 			ecryptfs_printk(KERN_DEBUG,
 					"Valid headers not found\n");
 			if (!(mount_crypt_stat->flags
 			      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 				rc = -EIO;
 				printk(KERN_WARNING "Attempt to read file that "
 				       "is not in a valid eCryptfs format, "
 				       "and plaintext passthrough mode is not "
 				       "enabled; returning -EIO\n");
 				mutex_unlock(&crypt_stat->cs_mutex);
 				goto out_puts;
 			}
 			rc = 0;
 			crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 			mutex_unlock(&crypt_stat->cs_mutex);
 			goto out;
 		}
 	}
 	mutex_unlock(&crypt_stat->cs_mutex);
 	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = [0x%.16x] "
 			"size: [0x%.16x]\n", inode, inode->i_ino,
 			i_size_read(inode));
 	ecryptfs_set_file_lower(file, lower_file);
 	goto out;
 out_puts:
 	mntput(lower_mnt);
 	dput(lower_dentry);
 	kmem_cache_free(ecryptfs_file_info_cache,
 			ecryptfs_file_to_private(file));
 out:
 	return rc;
 }

 static int ecryptfs_flush(struct file *file, fl_owner_t td)
 {
 	int rc = 0;
 	struct file *lower_file = NULL;

 	lower_file = ecryptfs_file_to_lower(file);
 	if (lower_file->f_op && lower_file->f_op->flush)
 		rc = lower_file->f_op->flush(lower_file, td);
 	return rc;
 }

 static int ecryptfs_release(struct inode *inode, struct file *file)
 {
 	struct file *lower_file = ecryptfs_file_to_lower(file);
 	struct ecryptfs_file_info *file_info = ecryptfs_file_to_private(file);
 	struct inode *lower_inode = ecryptfs_inode_to_lower(inode);
 	int rc;

 	rc = ecryptfs_close_lower_file(lower_file);
 	if (rc) {
 		printk(KERN_ERR "Error closing lower_file\n");
 		goto out;
 	}
 	inode->i_blocks = lower_inode->i_blocks;
 	kmem_cache_free(ecryptfs_file_info_cache, file_info);
 out:
 	return rc;
 }

 static int
 ecryptfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
 	struct file *lower_file = ecryptfs_file_to_lower(file);
 	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 	struct inode *lower_inode = lower_dentry->d_inode;
 	int rc = -EINVAL;

 	if (lower_inode->i_fop->fsync) {
 		mutex_lock(&lower_inode->i_mutex);
 		rc = lower_inode->i_fop->fsync(lower_file, lower_dentry,
 					       datasync);
 		mutex_unlock(&lower_inode->i_mutex);
 	}
 	return rc;
 }

 static int ecryptfs_fasync(int fd, struct file *file, int flag)
 {
 	int rc = 0;
 	struct file *lower_file = NULL;

 	lower_file = ecryptfs_file_to_lower(file);
 	if (lower_file->f_op && lower_file->f_op->fasync)
 		rc = lower_file->f_op->fasync(fd, lower_file, flag);
 	return rc;
 }

 static int ecryptfs_ioctl(struct inode *inode, struct file *file,
 			  unsigned int cmd, unsigned long arg);

 const struct file_operations ecryptfs_dir_fops = {
 	.readdir = ecryptfs_readdir,
 	.ioctl = ecryptfs_ioctl,
 	.mmap = generic_file_mmap,
 	.open = ecryptfs_open,
 	.flush = ecryptfs_flush,
 	.release = ecryptfs_release,
 	.fsync = ecryptfs_fsync,
 	.fasync = ecryptfs_fasync,
 	.splice_read = generic_file_splice_read,
 };

 const struct file_operations ecryptfs_main_fops = {
 	.llseek = generic_file_llseek,
 	.read = do_sync_read,
 	.aio_read = ecryptfs_read_update_atime,
 	.write = do_sync_write,
 	.aio_write = generic_file_aio_write,
 	.readdir = ecryptfs_readdir,
 	.ioctl = ecryptfs_ioctl,
 	.mmap = generic_file_mmap,
 	.open = ecryptfs_open,
 	.flush = ecryptfs_flush,
 	.release = ecryptfs_release,
 	.fsync = ecryptfs_fsync,
 	.fasync = ecryptfs_fasync,
 	.splice_read = generic_file_splice_read,
 };

 static int
 ecryptfs_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	       unsigned long arg)
 {
 	int rc = 0;
 	struct file *lower_file = NULL;

 	if (ecryptfs_file_to_private(file))
 		lower_file = ecryptfs_file_to_lower(file);
 	if (lower_file && lower_file->f_op && lower_file->f_op->ioctl)
 		rc = lower_file->f_op->ioctl(ecryptfs_inode_to_lower(inode),
 					     lower_file, cmd, arg);
 	else
 		rc = -ENOTTY;
 	return rc;
 }
	/**
	* eCryptfs: Linux filesystem encryption layer
	*
	* Copyright (C) 1997-2004 Erez Zadok
	* Copyright (C) 2001-2004 Stony Brook University
	* Copyright (C) 2004-2007 International Business Machines Corp.
	* Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
	* Michael C. Thompson <mcthomps@us.ibm.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	* 02111-1307, USA.
	*/

	#include <linux/file.h>
	#include <linux/poll.h>
	#include <linux/mount.h>
	#include <linux/pagemap.h>
	#include <linux/security.h>
	#include <linux/compat.h>
	#include <linux/fs_stack.h>
	#include "ecryptfs_kernel.h"

	/**
	* ecryptfs_read_update_atime
	*
	* generic_file_read updates the atime of upper layer inode. But, it
	* doesn't give us a chance to update the atime of the lower layer
	* inode. This function is a wrapper to generic_file_read. It
	* updates the atime of the lower level inode if generic_file_read
	* returns without any errors. This is to be used only for file reads.
	* The function to be used for directory reads is ecryptfs_read.
	*/
	static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs, loff_t pos)
	{
	int rc;
	struct dentry *lower_dentry;
	struct vfsmount *lower_vfsmount;
	struct file *file = iocb->ki_filp;

	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
	/*
	* Even though this is a async interface, we need to wait
	* for IO to finish to update atime
	*/
	if (-EIOCBQUEUED == rc)
	rc = wait_on_sync_kiocb(iocb);
	if (rc >= 0) {
	lower_dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
	lower_vfsmount = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
	touch_atime(lower_vfsmount, lower_dentry);
	}
	return rc;
	}

	struct ecryptfs_getdents_callback {
	void *dirent;
	struct dentry *dentry;
	filldir_t filldir;
	int err;
	int filldir_called;
	int entries_written;
	};

	/* Inspired by generic filldir in fs/readir.c */
	static int
	ecryptfs_filldir(void dirent, const char name, int namelen, loff_t offset,
	u64 ino, unsigned int d_type)
	{
	struct ecryptfs_crypt_stat *crypt_stat;
	struct ecryptfs_getdents_callback *buf =
	(struct ecryptfs_getdents_callback *)dirent;
	int rc;
	int decoded_length;
	char *decoded_name;

	crypt_stat = ecryptfs_dentry_to_private(buf->dentry)->crypt_stat;
	buf->filldir_called++;
	decoded_length = ecryptfs_decode_filename(crypt_stat, name, namelen,
	&decoded_name);
	if (decoded_length < 0) {
	rc = decoded_length;
	goto out;
	}
	rc = buf->filldir(buf->dirent, decoded_name, decoded_length, offset,
	ino, d_type);
	kfree(decoded_name);
	if (rc >= 0)
	buf->entries_written++;
	out:
	return rc;
	}

	/**
	* ecryptfs_readdir
	* @file: The ecryptfs file struct
	* @dirent: Directory entry
	* @filldir: The filldir callback function
	*/
	static int ecryptfs_readdir(struct file file, void dirent, filldir_t filldir)
	{
	int rc;
	struct file *lower_file;
	struct inode *inode;
	struct ecryptfs_getdents_callback buf;

	lower_file = ecryptfs_file_to_lower(file);
	lower_file->f_pos = file->f_pos;
	inode = file->f_path.dentry->d_inode;
	memset(&buf, 0, sizeof(buf));
	buf.dirent = dirent;
	buf.dentry = file->f_path.dentry;
	buf.filldir = filldir;
	retry:
	buf.filldir_called = 0;
	buf.entries_written = 0;
	buf.err = 0;
	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
	if (buf.err)
	rc = buf.err;
	if (buf.filldir_called && !buf.entries_written)
	goto retry;
	file->f_pos = lower_file->f_pos;
	if (rc >= 0)
	fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
	return rc;
	}

	struct kmem_cache *ecryptfs_file_info_cache;

	int ecryptfs_open_lower_file(struct file **lower_file,
	struct dentry *lower_dentry,
	struct vfsmount *lower_mnt, int flags)
	{
	int rc = 0;

	flags \|= O_LARGEFILE;
	dget(lower_dentry);
	mntget(lower_mnt);
	*lower_file = dentry_open(lower_dentry, lower_mnt, flags);
	if (IS_ERR(*lower_file)) {
	printk(KERN_ERR "Error opening lower file for lower_dentry "
	"[0x%p], lower_mnt [0x%p], and flags [0x%x]\n",
	lower_dentry, lower_mnt, flags);
	rc = PTR_ERR(*lower_file);
	*lower_file = NULL;
	goto out;
	}
	out:
	return rc;
	}

	int ecryptfs_close_lower_file(struct file *lower_file)
	{
	fput(lower_file);
	return 0;
	}

	/**
	* ecryptfs_open
	* @inode: inode speciying file to open
	* @file: Structure to return filled in
	*
	* Opens the file specified by inode.
	*
	* Returns zero on success; non-zero otherwise
	*/
	static int ecryptfs_open(struct inode inode, struct file file)
	{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	* ecryptfs_lookup() */
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	struct inode *lower_inode = NULL;
	struct file *lower_file = NULL;
	struct vfsmount *lower_mnt;
	struct ecryptfs_file_info *file_info;
	int lower_flags;

	mount_crypt_stat = &ecryptfs_superblock_to_private(
	ecryptfs_dentry->d_sb)->mount_crypt_stat;
	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	&& ((file->f_flags & O_WRONLY) \|\| (file->f_flags & O_RDWR)
	\|\| (file->f_flags & O_CREAT) \|\| (file->f_flags & O_TRUNC)
	\|\| (file->f_flags & O_APPEND))) {
	printk(KERN_WARNING "Mount has encrypted view enabled; "
	"files may only be read\n");
	rc = -EPERM;
	goto out;
	}
	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
	ecryptfs_printk(KERN_ERR,
	"Error attempting to allocate memory\n");
	rc = -ENOMEM;
	goto out;
	}
	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
	/* Policy code enabled in future release */
	crypt_stat->flags \|= ECRYPTFS_POLICY_APPLIED;
	crypt_stat->flags \|= ECRYPTFS_ENCRYPTED;
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	lower_flags = file->f_flags;
	if ((lower_flags & O_ACCMODE) == O_WRONLY)
	lower_flags = (lower_flags & O_ACCMODE) \| O_RDWR;
	if (file->f_flags & O_APPEND)
	lower_flags &= ~O_APPEND;
	lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
	/* Corresponding fput() in ecryptfs_release() */
	rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt,
	lower_flags);
	if (rc) {
	ecryptfs_printk(KERN_ERR, "Error opening lower file\n");
	goto out_puts;
	}
	ecryptfs_set_file_lower(file, lower_file);
	/* Isn't this check the same as the one in lookup? */
	lower_inode = lower_dentry->d_inode;
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
	rc = 0;
	goto out;
	}
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
	\|\| !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
	rc = ecryptfs_read_metadata(ecryptfs_dentry, lower_file);
	if (rc) {
	ecryptfs_printk(KERN_DEBUG,
	"Valid headers not found\n");
	if (!(mount_crypt_stat->flags
	& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
	rc = -EIO;
	printk(KERN_WARNING "Attempt to read file that "
	"is not in a valid eCryptfs format, "
	"and plaintext passthrough mode is not "
	"enabled; returning -EIO\n");
	mutex_unlock(&crypt_stat->cs_mutex);
	goto out_puts;
	}
	rc = 0;
	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
	mutex_unlock(&crypt_stat->cs_mutex);
	goto out;
	}
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = [0x%.16x] "
	"size: [0x%.16x]\n", inode, inode->i_ino,
	i_size_read(inode));
	ecryptfs_set_file_lower(file, lower_file);
	goto out;
	out_puts:
	mntput(lower_mnt);
	dput(lower_dentry);
	kmem_cache_free(ecryptfs_file_info_cache,
	ecryptfs_file_to_private(file));
	out:
	return rc;
	}

	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	{
	int rc = 0;
	struct file *lower_file = NULL;

	lower_file = ecryptfs_file_to_lower(file);
	if (lower_file->f_op && lower_file->f_op->flush)
	rc = lower_file->f_op->flush(lower_file, td);
	return rc;
	}

	static int ecryptfs_release(struct inode inode, struct file file)
	{
	struct file *lower_file = ecryptfs_file_to_lower(file);
	struct ecryptfs_file_info *file_info = ecryptfs_file_to_private(file);
	struct inode *lower_inode = ecryptfs_inode_to_lower(inode);
	int rc;

	rc = ecryptfs_close_lower_file(lower_file);
	if (rc) {
	printk(KERN_ERR "Error closing lower_file\n");
	goto out;
	}
	inode->i_blocks = lower_inode->i_blocks;
	kmem_cache_free(ecryptfs_file_info_cache, file_info);
	out:
	return rc;
	}

	static int
	ecryptfs_fsync(struct file file, struct dentry dentry, int datasync)
	{
	struct file *lower_file = ecryptfs_file_to_lower(file);
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
	struct inode *lower_inode = lower_dentry->d_inode;
	int rc = -EINVAL;

	if (lower_inode->i_fop->fsync) {
	mutex_lock(&lower_inode->i_mutex);
	rc = lower_inode->i_fop->fsync(lower_file, lower_dentry,
	datasync);
	mutex_unlock(&lower_inode->i_mutex);
	}
	return rc;
	}

	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	{
	int rc = 0;
	struct file *lower_file = NULL;

	lower_file = ecryptfs_file_to_lower(file);
	if (lower_file->f_op && lower_file->f_op->fasync)
	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	return rc;
	}

	static int ecryptfs_ioctl(struct inode inode, struct file file,
	unsigned int cmd, unsigned long arg);

	const struct file_operations ecryptfs_dir_fops = {
	.readdir = ecryptfs_readdir,
	.ioctl = ecryptfs_ioctl,
	.mmap = generic_file_mmap,
	.open = ecryptfs_open,
	.flush = ecryptfs_flush,
	.release = ecryptfs_release,
	.fsync = ecryptfs_fsync,
	.fasync = ecryptfs_fasync,
	.splice_read = generic_file_splice_read,
	};

	const struct file_operations ecryptfs_main_fops = {
	.llseek = generic_file_llseek,
	.read = do_sync_read,
	.aio_read = ecryptfs_read_update_atime,
	.write = do_sync_write,
	.aio_write = generic_file_aio_write,
	.readdir = ecryptfs_readdir,
	.ioctl = ecryptfs_ioctl,
	.mmap = generic_file_mmap,
	.open = ecryptfs_open,
	.flush = ecryptfs_flush,
	.release = ecryptfs_release,
	.fsync = ecryptfs_fsync,
	.fasync = ecryptfs_fasync,
	.splice_read = generic_file_splice_read,
	};

	static int
	ecryptfs_ioctl(struct inode inode, struct file file, unsigned int cmd,
	unsigned long arg)
	{
	int rc = 0;
	struct file *lower_file = NULL;

	if (ecryptfs_file_to_private(file))
	lower_file = ecryptfs_file_to_lower(file);
	if (lower_file && lower_file->f_op && lower_file->f_op->ioctl)
	rc = lower_file->f_op->ioctl(ecryptfs_inode_to_lower(inode),
	lower_file, cmd, arg);
	else
	rc = -ENOTTY;
	return rc;
	}