[mirror_ubuntu-artful-kernel.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/aio.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,
				struct iov_iter *to)
{
	ssize_t rc;
	struct path *path;
	struct file *file = iocb->ki_filp;

	rc = generic_file_read_iter(iocb, to);
	/*
	 * 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) {
		path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
		touch_atime(path);
	}
	return rc;
}

struct ecryptfs_getdents_callback {
	struct dir_context ctx;
	struct dir_context *caller;
	struct super_block *sb;
	int filldir_called;
	int entries_written;
};

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

	buf->filldir_called++;
	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
						  buf->sb, 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;
	}
	buf->caller->pos = buf->ctx.pos;
	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
	kfree(name);
	if (!rc)
		buf->entries_written++;
out:
	return rc;
}

/**
 * ecryptfs_readdir
 * @file: The eCryptfs directory file
 * @ctx: The actor to feed the entries to
 */
static int ecryptfs_readdir(struct file *file, struct dir_context *ctx)
{
	int rc;
	struct file *lower_file;
	struct inode *inode = file_inode(file);
	struct ecryptfs_getdents_callback buf = {
		.ctx.actor = ecryptfs_filldir,
		.caller = ctx,
		.sb = inode->i_sb,
	};
	lower_file = ecryptfs_file_to_lower(file);
	lower_file->f_pos = ctx->pos;
	rc = iterate_dir(lower_file, &buf.ctx);
	ctx->pos = buf.ctx.pos;
	if (rc < 0)
		goto out;
	if (buf.filldir_called && !buf.entries_written)
		goto out;
	if (rc >= 0)
		fsstack_copy_attr_atime(inode,
					file_inode(lower_file));
out:
	return rc;
}

struct kmem_cache *ecryptfs_file_info_cache;

static int read_or_initialize_metadata(struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct ecryptfs_crypt_stat *crypt_stat;
	int rc;

	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mount_crypt_stat = &ecryptfs_superblock_to_private(
						inode->i_sb)->mount_crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);

	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	    crypt_stat->flags & ECRYPTFS_KEY_VALID) {
		rc = 0;
		goto out;
	}

	rc = ecryptfs_read_metadata(dentry);
	if (!rc)
		goto out;

	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
		crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
				       | ECRYPTFS_ENCRYPTED);
		rc = 0;
		goto out;
	}

	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	    !i_size_read(ecryptfs_inode_to_lower(inode))) {
		rc = ecryptfs_initialize_file(dentry, inode);
		if (!rc)
			goto out;
	}

	rc = -EIO;
out:
	mutex_unlock(&crypt_stat->cs_mutex);
	return rc;
}

/**
 * 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 dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct ecryptfs_file_info *file_info;

	/* 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;
	}
	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);
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the lower file for the dentry with name "
			"[%pd]; rc = [%d]\n", __func__,
			ecryptfs_dentry, rc);
		goto out_free;
	}
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
	    == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out_put;
	}
	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;
	}
	rc = read_or_initialize_metadata(ecryptfs_dentry);
	if (rc)
		goto out_put;
	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
			"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
			(unsigned long long)i_size_read(inode));
	goto out;
out_put:
	ecryptfs_put_lower_file(inode);
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)
{
	struct file *lower_file = ecryptfs_file_to_lower(file);

	if (lower_file->f_op->flush) {
		filemap_write_and_wait(file->f_mapping);
		return lower_file->f_op->flush(lower_file, td);
	}

	return 0;
}

static int ecryptfs_release(struct inode *inode, struct file *file)
{
	ecryptfs_put_lower_file(inode);
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
	return 0;
}

static int
ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	int rc;

	rc = filemap_write_and_wait(file->f_mapping);
	if (rc)
		return rc;

	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;

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

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

	if (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 = ecryptfs_file_to_lower(file);
	long rc = -ENOIOCTLCMD;

	if (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 = {
	.iterate = ecryptfs_readdir,
	.read = generic_read_dir,
	.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,
	.llseek = default_llseek,
};

const struct file_operations ecryptfs_main_fops = {
	.llseek = generic_file_llseek,
	.read = new_sync_read,
	.read_iter = ecryptfs_read_update_atime,
	.write = new_sync_write,
	.write_iter = generic_file_write_iter,
	.iterate = 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>
a27bb332	34	#include <linux/aio.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,
02797829	48	struct iov_iter *to)
237fead6	49	{
38a708d7	50	ssize_t rc;
cc18ec3c	51	struct path *path;
237fead6 MH	52	struct file *file = iocb->ki_filp;
237fead6 MH	53
02797829	54	rc = generic_file_read_iter(iocb, to);
237fead6 MH	55	/*
	56	* Even though this is a async interface, we need to wait
	57	* for IO to finish to update atime
	58	*/
	59	if (-EIOCBQUEUED == rc)
	60	rc = wait_on_sync_kiocb(iocb);
	61	if (rc >= 0) {
cc18ec3c MW	62	path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
cc18ec3c MW	63	touch_atime(path);
237fead6 MH	64	}
	65	return rc;
	66	}
	67
	68	struct ecryptfs_getdents_callback {
5c0ba4e0	69	struct dir_context ctx;
2de5f059	70	struct dir_context *caller;
0747fdb2	71	struct super_block *sb;
237fead6 MH	72	int filldir_called;
	73	int entries_written;
	74	};
	75
7d6c7045	76	/* Inspired by generic filldir in fs/readdir.c */
237fead6	77	static int
ac7576f4 MS	78	ecryptfs_filldir(struct dir_context ctx, const char lower_name,
ac7576f4 MS	79	int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
237fead6	80	{
237fead6	81	struct ecryptfs_getdents_callback *buf =
ac7576f4	82	container_of(ctx, struct ecryptfs_getdents_callback, ctx);
a8f12864	83	size_t name_size;
addd65ad	84	char *name;
237fead6	85	int rc;
237fead6	86
237fead6	87	buf->filldir_called++;
addd65ad	88	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
0747fdb2	89	buf->sb, lower_name,
addd65ad MH	90	lower_namelen);
	91	if (rc) {
	92	printk(KERN_ERR "%s: Error attempting to decode and decrypt "
	93	"filename [%s]; rc = [%d]\n", __func__, lower_name,
	94	rc);
237fead6 MH	95	goto out;
237fead6 MH	96	}
2de5f059 AV	97	buf->caller->pos = buf->ctx.pos;
2de5f059 AV	98	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
addd65ad	99	kfree(name);
2de5f059	100	if (!rc)
237fead6 MH	101	buf->entries_written++;
	102	out:
	103	return rc;
	104	}
	105
	106	/**
	107	* ecryptfs_readdir
addd65ad	108	* @file: The eCryptfs directory file
2de5f059	109	* @ctx: The actor to feed the entries to
237fead6	110	*/
2de5f059	111	static int ecryptfs_readdir(struct file file, struct dir_context ctx)
237fead6 MH	112	{
	113	int rc;
	114	struct file *lower_file;
0747fdb2	115	struct inode *inode = file_inode(file);
2de5f059 AV	116	struct ecryptfs_getdents_callback buf = {
	117	.ctx.actor = ecryptfs_filldir,
	118	.caller = ctx,
0747fdb2	119	.sb = inode->i_sb,
2de5f059	120	};
237fead6	121	lower_file = ecryptfs_file_to_lower(file);
2de5f059	122	lower_file->f_pos = ctx->pos;
5c0ba4e0	123	rc = iterate_dir(lower_file, &buf.ctx);
2de5f059	124	ctx->pos = buf.ctx.pos;
7d6c7045 MH	125	if (rc < 0)
	126	goto out;
	127	if (buf.filldir_called && !buf.entries_written)
	128	goto out;
237fead6	129	if (rc >= 0)
7d6c7045	130	fsstack_copy_attr_atime(inode,
496ad9aa	131	file_inode(lower_file));
7d6c7045	132	out:
237fead6 MH	133	return rc;
	134	}
	135
	136	struct kmem_cache *ecryptfs_file_info_cache;
	137
e3ccaa97 TH	138	static int read_or_initialize_metadata(struct dentry *dentry)
	139	{
	140	struct inode *inode = dentry->d_inode;
	141	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	142	struct ecryptfs_crypt_stat *crypt_stat;
	143	int rc;
	144
	145	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	146	mount_crypt_stat = &ecryptfs_superblock_to_private(
	147	inode->i_sb)->mount_crypt_stat;
	148	mutex_lock(&crypt_stat->cs_mutex);
	149
	150	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	151	crypt_stat->flags & ECRYPTFS_KEY_VALID) {
	152	rc = 0;
	153	goto out;
	154	}
	155
	156	rc = ecryptfs_read_metadata(dentry);
	157	if (!rc)
	158	goto out;
	159
	160	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
	161	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
	162	\| ECRYPTFS_ENCRYPTED);
	163	rc = 0;
	164	goto out;
	165	}
	166
	167	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	168	!i_size_read(ecryptfs_inode_to_lower(inode))) {
	169	rc = ecryptfs_initialize_file(dentry, inode);
	170	if (!rc)
	171	goto out;
	172	}
	173
	174	rc = -EIO;
	175	out:
	176	mutex_unlock(&crypt_stat->cs_mutex);
	177	return rc;
	178	}
	179
237fead6 MH	180	/**
	181	* ecryptfs_open
	182	* @inode: inode speciying file to open
	183	* @file: Structure to return filled in
	184	*
	185	* Opens the file specified by inode.
	186	*
	187	* Returns zero on success; non-zero otherwise
	188	*/
	189	static int ecryptfs_open(struct inode inode, struct file file)
	190	{
	191	int rc = 0;
	192	struct ecryptfs_crypt_stat *crypt_stat = NULL;
bd243a4b	193	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	194	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	195	* ecryptfs_lookup() */
237fead6	196	struct ecryptfs_file_info *file_info;
237fead6 MH	197
237fead6 MH	198	/* Released in ecryptfs_release or end of function if failure */
c3762229	199	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	200	ecryptfs_set_file_private(file, file_info);
	201	if (!file_info) {
	202	ecryptfs_printk(KERN_ERR,
	203	"Error attempting to allocate memory\n");
	204	rc = -ENOMEM;
	205	goto out;
	206	}
237fead6	207	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	208	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	209	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	210	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	211	/* Policy code enabled in future release */
2ed92554 MH	212	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	213	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	214	}
237fead6 MH	215	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	216	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	217	if (rc) {
27992890 RS	218	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	219	"the lower file for the dentry with name "
9e78d14a DH	220	"[%pd]; rc = [%d]\n", __func__,
9e78d14a DH	221	ecryptfs_dentry, rc);
27992890	222	goto out_free;
72b55fff	223	}
0abe1169 RS	224	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	225	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	226	rc = -EPERM;
332ab16f	227	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	228	"file must hence be opened RO\n", __func__);
332ab16f	229	goto out_put;
e27759d7	230	}
2ed92554 MH	231	ecryptfs_set_file_lower(
2ed92554 MH	232	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	233	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	234	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	235	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	236	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	237	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	238	rc = 0;
	239	goto out;
	240	}
e3ccaa97 TH	241	rc = read_or_initialize_metadata(ecryptfs_dentry);
	242	if (rc)
	243	goto out_put;
888d57bb JP	244	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	245	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	246	(unsigned long long)i_size_read(inode));
237fead6	247	goto out;
332ab16f TH	248	out_put:
332ab16f TH	249	ecryptfs_put_lower_file(inode);
2ed92554	250	out_free:
237fead6 MH	251	kmem_cache_free(ecryptfs_file_info_cache,
	252	ecryptfs_file_to_private(file));
	253	out:
	254	return rc;
	255	}
	256
	257	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	258	{
64e6651d TH	259	struct file *lower_file = ecryptfs_file_to_lower(file);
64e6651d TH	260
72c2d531	261	if (lower_file->f_op->flush) {
64e6651d TH	262	filemap_write_and_wait(file->f_mapping);
	263	return lower_file->f_op->flush(lower_file, td);
	264	}
	265
	266	return 0;
237fead6 MH	267	}
	268
	269	static int ecryptfs_release(struct inode inode, struct file file)
	270	{
332ab16f	271	ecryptfs_put_lower_file(inode);
2ed92554 MH	272	kmem_cache_free(ecryptfs_file_info_cache,
	273	ecryptfs_file_to_private(file));
	274	return 0;
237fead6 MH	275	}
	276
	277	static int
02c24a82	278	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	279	{
bc5abcf7 TH	280	int rc;
	281
	282	rc = filemap_write_and_wait(file->f_mapping);
	283	if (rc)
	284	return rc;
	285
821f7494	286	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	287	}
	288
	289	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	290	{
	291	int rc = 0;
	292	struct file *lower_file = NULL;
	293
	294	lower_file = ecryptfs_file_to_lower(file);
72c2d531	295	if (lower_file->f_op->fasync)
237fead6 MH	296	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	297	return rc;
	298	}
	299
c43f7b8f TH	300	static long
	301	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	302	{
2000f5be	303	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	304	long rc = -ENOTTY;
c43f7b8f TH	305
bdd35366	306	if (lower_file->f_op->unlocked_ioctl)
c43f7b8f TH	307	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	308	return rc;
	309	}
	310
	311	#ifdef CONFIG_COMPAT
	312	static long
	313	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	314	{
2000f5be	315	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	316	long rc = -ENOIOCTLCMD;
c43f7b8f TH	317
c2e3f5d5	318	if (lower_file->f_op->compat_ioctl)
c43f7b8f TH	319	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	320	return rc;
	321	}
	322	#endif
237fead6 MH	323
237fead6 MH	324	const struct file_operations ecryptfs_dir_fops = {
2de5f059	325	.iterate = ecryptfs_readdir,
323ef68f	326	.read = generic_read_dir,
c43f7b8f TH	327	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	328	#ifdef CONFIG_COMPAT
	329	.compat_ioctl = ecryptfs_compat_ioctl,
	330	#endif
237fead6 MH	331	.open = ecryptfs_open,
	332	.flush = ecryptfs_flush,
	333	.release = ecryptfs_release,
	334	.fsync = ecryptfs_fsync,
	335	.fasync = ecryptfs_fasync,
e9f6a99c	336	.splice_read = generic_file_splice_read,
6038f373	337	.llseek = default_llseek,
237fead6 MH	338	};
	339
	340	const struct file_operations ecryptfs_main_fops = {
53a2731f	341	.llseek = generic_file_llseek,
02797829 AV	342	.read = new_sync_read,
02797829 AV	343	.read_iter = ecryptfs_read_update_atime,
8174202b AV	344	.write = new_sync_write,
8174202b AV	345	.write_iter = generic_file_write_iter,
2de5f059	346	.iterate = ecryptfs_readdir,
c43f7b8f TH	347	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	348	#ifdef CONFIG_COMPAT
	349	.compat_ioctl = ecryptfs_compat_ioctl,
	350	#endif
821f7494	351	.mmap = generic_file_mmap,
237fead6 MH	352	.open = ecryptfs_open,
	353	.flush = ecryptfs_flush,
	354	.release = ecryptfs_release,
	355	.fsync = ecryptfs_fsync,
	356	.fasync = ecryptfs_fasync,
e9f6a99c	357	.splice_read = generic_file_splice_read,
237fead6	358	};