[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ecryptfs / file.c

/**
 * 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/slab.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/fs_stack.h>
#include <linux/smp_lock.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 filldir_called;
	int entries_written;
};

/* Inspired by generic filldir in fs/readdir.c */
static int
ecryptfs_filldir(void *dirent, const char *lower_name, int lower_namelen,
		 loff_t offset, u64 ino, unsigned int d_type)
{
	struct ecryptfs_getdents_callback *buf =
	    (struct ecryptfs_getdents_callback *)dirent;
	size_t name_size;
	char *name;
	int rc;

	buf->filldir_called++;
	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
						  buf->dentry, lower_name,
						  lower_namelen);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to decode and decrypt "
		       "filename [%s]; rc = [%d]\n", __func__, lower_name,
		       rc);
		goto out;
	}
	rc = buf->filldir(buf->dirent, name, name_size, offset, ino, d_type);
	kfree(name);
	if (rc >= 0)
		buf->entries_written++;
out:
	return rc;
}

/**
 * ecryptfs_readdir
 * @file: The eCryptfs directory file
 * @dirent: Directory entry handle
 * @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;
	buf.filldir_called = 0;
	buf.entries_written = 0;
	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
	file->f_pos = lower_file->f_pos;
	if (rc < 0)
		goto out;
	if (buf.filldir_called && !buf.entries_written)
		goto out;
	if (rc >= 0)
		fsstack_copy_attr_atime(inode,
					lower_file->f_path.dentry->d_inode);
out:
	return rc;
}

struct kmem_cache *ecryptfs_file_info_cache;

/**
 * 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;
	struct ecryptfs_file_info *file_info;

	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
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	if (!ecryptfs_inode_to_private(inode)->lower_file) {
		rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
		if (rc) {
			printk(KERN_ERR "%s: Error attempting to initialize "
			       "the persistent file for the dentry with name "
			       "[%s]; rc = [%d]\n", __func__,
			       ecryptfs_dentry->d_name.name, rc);
			goto out_free;
		}
	}
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
	    && !(file->f_flags & O_RDONLY)) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out_free;
	}
	ecryptfs_set_file_lower(
		file, ecryptfs_inode_to_private(inode)->lower_file);
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		mutex_lock(&crypt_stat->cs_mutex);
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		mutex_unlock(&crypt_stat->cs_mutex);
		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);
		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 "Either the lower file "
				       "is not in a valid eCryptfs format, "
				       "or the key could not be retrieved. "
				       "Plaintext passthrough mode is not "
				       "enabled; returning -EIO\n");
				mutex_unlock(&crypt_stat->cs_mutex);
				goto out_free;
			}
			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));
	goto out;
out_free:
	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)
{
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
	return 0;
}

static int
ecryptfs_fsync(struct file *file, int datasync)
{
	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
}

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

	lock_kernel();
	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);
	unlock_kernel();
	return rc;
}

static long
ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct file *lower_file = NULL;
	long rc = -ENOTTY;

	if (ecryptfs_file_to_private(file))
		lower_file = ecryptfs_file_to_lower(file);
	if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
		rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	return rc;
}

#ifdef CONFIG_COMPAT
static long
ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct file *lower_file = NULL;
	long rc = -ENOIOCTLCMD;

	if (ecryptfs_file_to_private(file))
		lower_file = ecryptfs_file_to_lower(file);
	if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
		rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	return rc;
}
#endif

const struct file_operations ecryptfs_dir_fops = {
	.readdir = ecryptfs_readdir,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.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,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.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,
};
Commit	Line	Data
237fead6 MH	1	/**
	2	* eCryptfs: Linux filesystem encryption layer
	3	*
	4	* Copyright (C) 1997-2004 Erez Zadok
	5	* Copyright (C) 2001-2004 Stony Brook University
dd2a3b7a	6	* Copyright (C) 2004-2007 International Business Machines Corp.
237fead6 MH	7	* Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
	8	* Michael C. Thompson <mcthomps@us.ibm.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of the
	13	* License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	23	* 02111-1307, USA.
	24	*/
	25
	26	#include <linux/file.h>
	27	#include <linux/poll.h>
5a0e3ad6	28	#include <linux/slab.h>
237fead6 MH	29	#include <linux/mount.h>
	30	#include <linux/pagemap.h>
	31	#include <linux/security.h>
237fead6	32	#include <linux/compat.h>
0cc72dc7	33	#include <linux/fs_stack.h>
dda6445e	34	#include <linux/smp_lock.h>
237fead6 MH	35	#include "ecryptfs_kernel.h"
237fead6 MH	36
237fead6 MH	37	/**
	38	* ecryptfs_read_update_atime
	39	*
	40	* generic_file_read updates the atime of upper layer inode. But, it
	41	* doesn't give us a chance to update the atime of the lower layer
	42	* inode. This function is a wrapper to generic_file_read. It
	43	* updates the atime of the lower level inode if generic_file_read
	44	* returns without any errors. This is to be used only for file reads.
	45	* The function to be used for directory reads is ecryptfs_read.
	46	*/
	47	static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
	48	const struct iovec *iov,
	49	unsigned long nr_segs, loff_t pos)
	50	{
	51	int rc;
	52	struct dentry *lower_dentry;
	53	struct vfsmount *lower_vfsmount;
	54	struct file *file = iocb->ki_filp;
	55
	56	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
	57	/*
	58	* Even though this is a async interface, we need to wait
	59	* for IO to finish to update atime
	60	*/
	61	if (-EIOCBQUEUED == rc)
	62	rc = wait_on_sync_kiocb(iocb);
	63	if (rc >= 0) {
bd243a4b JJS	64	lower_dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
bd243a4b JJS	65	lower_vfsmount = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
237fead6 MH	66	touch_atime(lower_vfsmount, lower_dentry);
	67	}
	68	return rc;
	69	}
	70
	71	struct ecryptfs_getdents_callback {
	72	void *dirent;
	73	struct dentry *dentry;
	74	filldir_t filldir;
237fead6 MH	75	int filldir_called;
	76	int entries_written;
	77	};
	78
7d6c7045	79	/* Inspired by generic filldir in fs/readdir.c */
237fead6	80	static int
addd65ad MH	81	ecryptfs_filldir(void dirent, const char lower_name, int lower_namelen,
addd65ad MH	82	loff_t offset, u64 ino, unsigned int d_type)
237fead6	83	{
237fead6 MH	84	struct ecryptfs_getdents_callback *buf =
237fead6 MH	85	(struct ecryptfs_getdents_callback *)dirent;
a8f12864	86	size_t name_size;
addd65ad	87	char *name;
237fead6	88	int rc;
237fead6	89
237fead6	90	buf->filldir_called++;
addd65ad MH	91	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
	92	buf->dentry, lower_name,
	93	lower_namelen);
	94	if (rc) {
	95	printk(KERN_ERR "%s: Error attempting to decode and decrypt "
	96	"filename [%s]; rc = [%d]\n", __func__, lower_name,
	97	rc);
237fead6 MH	98	goto out;
237fead6 MH	99	}
addd65ad MH	100	rc = buf->filldir(buf->dirent, name, name_size, offset, ino, d_type);
addd65ad MH	101	kfree(name);
237fead6 MH	102	if (rc >= 0)
	103	buf->entries_written++;
	104	out:
	105	return rc;
	106	}
	107
	108	/**
	109	* ecryptfs_readdir
addd65ad MH	110	* @file: The eCryptfs directory file
addd65ad MH	111	* @dirent: Directory entry handle
237fead6 MH	112	* @filldir: The filldir callback function
	113	*/
	114	static int ecryptfs_readdir(struct file file, void dirent, filldir_t filldir)
	115	{
	116	int rc;
	117	struct file *lower_file;
	118	struct inode *inode;
	119	struct ecryptfs_getdents_callback buf;
	120
	121	lower_file = ecryptfs_file_to_lower(file);
	122	lower_file->f_pos = file->f_pos;
bd243a4b	123	inode = file->f_path.dentry->d_inode;
237fead6 MH	124	memset(&buf, 0, sizeof(buf));
237fead6 MH	125	buf.dirent = dirent;
bd243a4b	126	buf.dentry = file->f_path.dentry;
237fead6	127	buf.filldir = filldir;
237fead6 MH	128	buf.filldir_called = 0;
237fead6 MH	129	buf.entries_written = 0;
237fead6	130	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
237fead6	131	file->f_pos = lower_file->f_pos;
7d6c7045 MH	132	if (rc < 0)
	133	goto out;
	134	if (buf.filldir_called && !buf.entries_written)
	135	goto out;
237fead6	136	if (rc >= 0)
7d6c7045 MH	137	fsstack_copy_attr_atime(inode,
	138	lower_file->f_path.dentry->d_inode);
	139	out:
237fead6 MH	140	return rc;
	141	}
	142
	143	struct kmem_cache *ecryptfs_file_info_cache;
	144
	145	/**
	146	* ecryptfs_open
	147	* @inode: inode speciying file to open
	148	* @file: Structure to return filled in
	149	*
	150	* Opens the file specified by inode.
	151	*
	152	* Returns zero on success; non-zero otherwise
	153	*/
	154	static int ecryptfs_open(struct inode inode, struct file file)
	155	{
	156	int rc = 0;
	157	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	158	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
bd243a4b	159	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	160	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	161	* ecryptfs_lookup() */
4aa25bcb	162	struct dentry *lower_dentry;
237fead6	163	struct ecryptfs_file_info *file_info;
237fead6	164
e77a56dd MH	165	mount_crypt_stat = &ecryptfs_superblock_to_private(
	166	ecryptfs_dentry->d_sb)->mount_crypt_stat;
	167	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	168	&& ((file->f_flags & O_WRONLY) \|\| (file->f_flags & O_RDWR)
	169	\|\| (file->f_flags & O_CREAT) \|\| (file->f_flags & O_TRUNC)
	170	\|\| (file->f_flags & O_APPEND))) {
	171	printk(KERN_WARNING "Mount has encrypted view enabled; "
	172	"files may only be read\n");
	173	rc = -EPERM;
	174	goto out;
	175	}
237fead6	176	/* Released in ecryptfs_release or end of function if failure */
c3762229	177	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	178	ecryptfs_set_file_private(file, file_info);
	179	if (!file_info) {
	180	ecryptfs_printk(KERN_ERR,
	181	"Error attempting to allocate memory\n");
	182	rc = -ENOMEM;
	183	goto out;
	184	}
237fead6 MH	185	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
237fead6 MH	186	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	187	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	188	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	189	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	190	/* Policy code enabled in future release */
2ed92554 MH	191	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	192	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	193	}
237fead6 MH	194	mutex_unlock(&crypt_stat->cs_mutex);
72b55fff	195	if (!ecryptfs_inode_to_private(inode)->lower_file) {
72b55fff MH	196	rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
	197	if (rc) {
	198	printk(KERN_ERR "%s: Error attempting to initialize "
	199	"the persistent file for the dentry with name "
	200	"[%s]; rc = [%d]\n", __func__,
	201	ecryptfs_dentry->d_name.name, rc);
ceeab929	202	goto out_free;
72b55fff MH	203	}
72b55fff MH	204	}
e27759d7 EZ	205	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
	206	&& !(file->f_flags & O_RDONLY)) {
	207	rc = -EPERM;
	208	printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
	209	"file must hence be opened RO\n", __func__);
ceeab929	210	goto out_free;
e27759d7	211	}
2ed92554 MH	212	ecryptfs_set_file_lower(
2ed92554 MH	213	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	214	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	215	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	216	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	217	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	218	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	219	rc = 0;
	220	goto out;
	221	}
	222	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec MH	223	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
e2bd99ec MH	224	\|\| !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
d7cdc5fe	225	rc = ecryptfs_read_metadata(ecryptfs_dentry);
237fead6 MH	226	if (rc) {
	227	ecryptfs_printk(KERN_DEBUG,
	228	"Valid headers not found\n");
	229	if (!(mount_crypt_stat->flags
	230	& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
	231	rc = -EIO;
25bd8174	232	printk(KERN_WARNING "Either the lower file "
237fead6	233	"is not in a valid eCryptfs format, "
25bd8174 MH	234	"or the key could not be retrieved. "
25bd8174 MH	235	"Plaintext passthrough mode is not "
237fead6 MH	236	"enabled; returning -EIO\n");
237fead6 MH	237	mutex_unlock(&crypt_stat->cs_mutex);
2ed92554	238	goto out_free;
237fead6	239	}
237fead6	240	rc = 0;
e2bd99ec	241	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
237fead6 MH	242	mutex_unlock(&crypt_stat->cs_mutex);
	243	goto out;
	244	}
	245	}
	246	mutex_unlock(&crypt_stat->cs_mutex);
	247	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = [0x%.16x] "
	248	"size: [0x%.16x]\n", inode, inode->i_ino,
	249	i_size_read(inode));
237fead6	250	goto out;
2ed92554	251	out_free:
237fead6 MH	252	kmem_cache_free(ecryptfs_file_info_cache,
	253	ecryptfs_file_to_private(file));
	254	out:
	255	return rc;
	256	}
	257
	258	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	259	{
	260	int rc = 0;
	261	struct file *lower_file = NULL;
	262
	263	lower_file = ecryptfs_file_to_lower(file);
	264	if (lower_file->f_op && lower_file->f_op->flush)
	265	rc = lower_file->f_op->flush(lower_file, td);
	266	return rc;
	267	}
	268
	269	static int ecryptfs_release(struct inode inode, struct file file)
	270	{
2ed92554 MH	271	kmem_cache_free(ecryptfs_file_info_cache,
	272	ecryptfs_file_to_private(file));
	273	return 0;
237fead6 MH	274	}
	275
	276	static int
7ea80859	277	ecryptfs_fsync(struct file *file, int datasync)
237fead6	278	{
8018ab05	279	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	280	}
	281
	282	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	283	{
	284	int rc = 0;
	285	struct file *lower_file = NULL;
	286
dda6445e	287	lock_kernel();
237fead6 MH	288	lower_file = ecryptfs_file_to_lower(file);
	289	if (lower_file->f_op && lower_file->f_op->fasync)
	290	rc = lower_file->f_op->fasync(fd, lower_file, flag);
dda6445e	291	unlock_kernel();
237fead6 MH	292	return rc;
	293	}
	294
c43f7b8f TH	295	static long
	296	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	297	{
	298	struct file *lower_file = NULL;
	299	long rc = -ENOTTY;
	300
	301	if (ecryptfs_file_to_private(file))
	302	lower_file = ecryptfs_file_to_lower(file);
	303	if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
	304	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	305	return rc;
	306	}
	307
	308	#ifdef CONFIG_COMPAT
	309	static long
	310	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	311	{
	312	struct file *lower_file = NULL;
	313	long rc = -ENOIOCTLCMD;
	314
	315	if (ecryptfs_file_to_private(file))
	316	lower_file = ecryptfs_file_to_lower(file);
	317	if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
	318	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	319	return rc;
	320	}
	321	#endif
237fead6 MH	322
	323	const struct file_operations ecryptfs_dir_fops = {
	324	.readdir = ecryptfs_readdir,
c43f7b8f TH	325	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	326	#ifdef CONFIG_COMPAT
	327	.compat_ioctl = ecryptfs_compat_ioctl,
	328	#endif
237fead6 MH	329	.open = ecryptfs_open,
	330	.flush = ecryptfs_flush,
	331	.release = ecryptfs_release,
	332	.fsync = ecryptfs_fsync,
	333	.fasync = ecryptfs_fasync,
e9f6a99c	334	.splice_read = generic_file_splice_read,
237fead6 MH	335	};
	336
	337	const struct file_operations ecryptfs_main_fops = {
53a2731f	338	.llseek = generic_file_llseek,
237fead6 MH	339	.read = do_sync_read,
	340	.aio_read = ecryptfs_read_update_atime,
	341	.write = do_sync_write,
	342	.aio_write = generic_file_aio_write,
	343	.readdir = ecryptfs_readdir,
c43f7b8f TH	344	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	345	#ifdef CONFIG_COMPAT
	346	.compat_ioctl = ecryptfs_compat_ioctl,
	347	#endif
237fead6 MH	348	.mmap = generic_file_mmap,
	349	.open = ecryptfs_open,
	350	.flush = ecryptfs_flush,
	351	.release = ecryptfs_release,
	352	.fsync = ecryptfs_fsync,
	353	.fasync = ecryptfs_fasync,
e9f6a99c	354	.splice_read = generic_file_splice_read,
237fead6	355	};