[deliverable/linux.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,
				const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
{
	ssize_t rc;
	struct path *path;
	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) {
		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(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->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 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 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;
	}
	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 "
			"[%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_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 = NULL;
	long rc = -ENOTTY;

	if (ecryptfs_file_to_private(file))
		lower_file = ecryptfs_file_to_lower(file);
	if (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->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 = {
	.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 = do_sync_read,
	.aio_read = ecryptfs_read_update_atime,
	.write = do_sync_write,
	.aio_write = generic_file_aio_write,
	.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,
	48	const struct iovec *iov,
	49	unsigned long nr_segs, loff_t pos)
	50	{
38a708d7	51	ssize_t rc;
cc18ec3c	52	struct path *path;
237fead6 MH	53	struct file *file = iocb->ki_filp;
	54
	55	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
	56	/*
	57	* Even though this is a async interface, we need to wait
	58	* for IO to finish to update atime
	59	*/
	60	if (-EIOCBQUEUED == rc)
	61	rc = wait_on_sync_kiocb(iocb);
	62	if (rc >= 0) {
cc18ec3c MW	63	path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
cc18ec3c MW	64	touch_atime(path);
237fead6 MH	65	}
	66	return rc;
	67	}
	68
	69	struct ecryptfs_getdents_callback {
5c0ba4e0	70	struct dir_context ctx;
2de5f059	71	struct dir_context *caller;
0747fdb2	72	struct super_block *sb;
237fead6 MH	73	int filldir_called;
	74	int entries_written;
	75	};
	76
7d6c7045	77	/* Inspired by generic filldir in fs/readdir.c */
237fead6	78	static int
addd65ad MH	79	ecryptfs_filldir(void dirent, const char lower_name, int lower_namelen,
addd65ad MH	80	loff_t offset, u64 ino, unsigned int d_type)
237fead6	81	{
237fead6 MH	82	struct ecryptfs_getdents_callback *buf =
237fead6 MH	83	(struct ecryptfs_getdents_callback *)dirent;
a8f12864	84	size_t name_size;
addd65ad	85	char *name;
237fead6	86	int rc;
237fead6	87
237fead6	88	buf->filldir_called++;
addd65ad	89	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
0747fdb2	90	buf->sb, lower_name,
addd65ad MH	91	lower_namelen);
	92	if (rc) {
	93	printk(KERN_ERR "%s: Error attempting to decode and decrypt "
	94	"filename [%s]; rc = [%d]\n", __func__, lower_name,
	95	rc);
237fead6 MH	96	goto out;
237fead6 MH	97	}
2de5f059 AV	98	buf->caller->pos = buf->ctx.pos;
2de5f059 AV	99	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
addd65ad	100	kfree(name);
2de5f059	101	if (!rc)
237fead6 MH	102	buf->entries_written++;
	103	out:
	104	return rc;
	105	}
	106
	107	/**
	108	* ecryptfs_readdir
addd65ad	109	* @file: The eCryptfs directory file
2de5f059	110	* @ctx: The actor to feed the entries to
237fead6	111	*/
2de5f059	112	static int ecryptfs_readdir(struct file file, struct dir_context ctx)
237fead6 MH	113	{
	114	int rc;
	115	struct file *lower_file;
0747fdb2	116	struct inode *inode = file_inode(file);
2de5f059 AV	117	struct ecryptfs_getdents_callback buf = {
	118	.ctx.actor = ecryptfs_filldir,
	119	.caller = ctx,
0747fdb2	120	.sb = inode->i_sb,
2de5f059	121	};
237fead6	122	lower_file = ecryptfs_file_to_lower(file);
2de5f059	123	lower_file->f_pos = ctx->pos;
5c0ba4e0	124	rc = iterate_dir(lower_file, &buf.ctx);
2de5f059	125	ctx->pos = buf.ctx.pos;
7d6c7045 MH	126	if (rc < 0)
	127	goto out;
	128	if (buf.filldir_called && !buf.entries_written)
	129	goto out;
237fead6	130	if (rc >= 0)
7d6c7045	131	fsstack_copy_attr_atime(inode,
496ad9aa	132	file_inode(lower_file));
7d6c7045	133	out:
237fead6 MH	134	return rc;
	135	}
	136
	137	struct kmem_cache *ecryptfs_file_info_cache;
	138
e3ccaa97 TH	139	static int read_or_initialize_metadata(struct dentry *dentry)
	140	{
	141	struct inode *inode = dentry->d_inode;
	142	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	143	struct ecryptfs_crypt_stat *crypt_stat;
	144	int rc;
	145
	146	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	147	mount_crypt_stat = &ecryptfs_superblock_to_private(
	148	inode->i_sb)->mount_crypt_stat;
	149	mutex_lock(&crypt_stat->cs_mutex);
	150
	151	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	152	crypt_stat->flags & ECRYPTFS_KEY_VALID) {
	153	rc = 0;
	154	goto out;
	155	}
	156
	157	rc = ecryptfs_read_metadata(dentry);
	158	if (!rc)
	159	goto out;
	160
	161	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
	162	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
	163	\| ECRYPTFS_ENCRYPTED);
	164	rc = 0;
	165	goto out;
	166	}
	167
	168	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	169	!i_size_read(ecryptfs_inode_to_lower(inode))) {
	170	rc = ecryptfs_initialize_file(dentry, inode);
	171	if (!rc)
	172	goto out;
	173	}
	174
	175	rc = -EIO;
	176	out:
	177	mutex_unlock(&crypt_stat->cs_mutex);
	178	return rc;
	179	}
	180
237fead6 MH	181	/**
	182	* ecryptfs_open
	183	* @inode: inode speciying file to open
	184	* @file: Structure to return filled in
	185	*
	186	* Opens the file specified by inode.
	187	*
	188	* Returns zero on success; non-zero otherwise
	189	*/
	190	static int ecryptfs_open(struct inode inode, struct file file)
	191	{
	192	int rc = 0;
	193	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	194	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
bd243a4b	195	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	196	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	197	* ecryptfs_lookup() */
237fead6	198	struct ecryptfs_file_info *file_info;
237fead6	199
e77a56dd MH	200	mount_crypt_stat = &ecryptfs_superblock_to_private(
	201	ecryptfs_dentry->d_sb)->mount_crypt_stat;
	202	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	203	&& ((file->f_flags & O_WRONLY) \|\| (file->f_flags & O_RDWR)
	204	\|\| (file->f_flags & O_CREAT) \|\| (file->f_flags & O_TRUNC)
	205	\|\| (file->f_flags & O_APPEND))) {
	206	printk(KERN_WARNING "Mount has encrypted view enabled; "
	207	"files may only be read\n");
	208	rc = -EPERM;
	209	goto out;
	210	}
237fead6	211	/* Released in ecryptfs_release or end of function if failure */
c3762229	212	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	213	ecryptfs_set_file_private(file, file_info);
	214	if (!file_info) {
	215	ecryptfs_printk(KERN_ERR,
	216	"Error attempting to allocate memory\n");
	217	rc = -ENOMEM;
	218	goto out;
	219	}
237fead6	220	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	221	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	222	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	223	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	224	/* Policy code enabled in future release */
2ed92554 MH	225	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	226	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	227	}
237fead6 MH	228	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	229	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	230	if (rc) {
27992890 RS	231	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	232	"the lower file for the dentry with name "
27992890 RS	233	"[%s]; rc = [%d]\n", __func__,
	234	ecryptfs_dentry->d_name.name, rc);
	235	goto out_free;
72b55fff	236	}
0abe1169 RS	237	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	238	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	239	rc = -EPERM;
332ab16f	240	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	241	"file must hence be opened RO\n", __func__);
332ab16f	242	goto out_put;
e27759d7	243	}
2ed92554 MH	244	ecryptfs_set_file_lower(
2ed92554 MH	245	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	246	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	247	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	248	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	249	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	250	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	251	rc = 0;
	252	goto out;
	253	}
e3ccaa97 TH	254	rc = read_or_initialize_metadata(ecryptfs_dentry);
	255	if (rc)
	256	goto out_put;
888d57bb JP	257	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	258	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	259	(unsigned long long)i_size_read(inode));
237fead6	260	goto out;
332ab16f TH	261	out_put:
332ab16f TH	262	ecryptfs_put_lower_file(inode);
2ed92554	263	out_free:
237fead6 MH	264	kmem_cache_free(ecryptfs_file_info_cache,
	265	ecryptfs_file_to_private(file));
	266	out:
	267	return rc;
	268	}
	269
	270	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	271	{
64e6651d TH	272	struct file *lower_file = ecryptfs_file_to_lower(file);
64e6651d TH	273
72c2d531	274	if (lower_file->f_op->flush) {
64e6651d TH	275	filemap_write_and_wait(file->f_mapping);
	276	return lower_file->f_op->flush(lower_file, td);
	277	}
	278
	279	return 0;
237fead6 MH	280	}
	281
	282	static int ecryptfs_release(struct inode inode, struct file file)
	283	{
332ab16f	284	ecryptfs_put_lower_file(inode);
2ed92554 MH	285	kmem_cache_free(ecryptfs_file_info_cache,
	286	ecryptfs_file_to_private(file));
	287	return 0;
237fead6 MH	288	}
	289
	290	static int
02c24a82	291	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	292	{
bc5abcf7 TH	293	int rc;
	294
	295	rc = filemap_write_and_wait(file->f_mapping);
	296	if (rc)
	297	return rc;
	298
821f7494	299	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	300	}
	301
	302	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	303	{
	304	int rc = 0;
	305	struct file *lower_file = NULL;
	306
	307	lower_file = ecryptfs_file_to_lower(file);
72c2d531	308	if (lower_file->f_op->fasync)
237fead6 MH	309	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	310	return rc;
	311	}
	312
c43f7b8f TH	313	static long
	314	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	315	{
	316	struct file *lower_file = NULL;
	317	long rc = -ENOTTY;
	318
	319	if (ecryptfs_file_to_private(file))
	320	lower_file = ecryptfs_file_to_lower(file);
72c2d531	321	if (lower_file->f_op && lower_file->f_op->unlocked_ioctl)
c43f7b8f TH	322	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	323	return rc;
	324	}
	325
	326	#ifdef CONFIG_COMPAT
	327	static long
	328	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	329	{
	330	struct file *lower_file = NULL;
	331	long rc = -ENOIOCTLCMD;
	332
	333	if (ecryptfs_file_to_private(file))
	334	lower_file = ecryptfs_file_to_lower(file);
72c2d531	335	if (lower_file->f_op && lower_file->f_op->compat_ioctl)
c43f7b8f TH	336	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	337	return rc;
	338	}
	339	#endif
237fead6 MH	340
237fead6 MH	341	const struct file_operations ecryptfs_dir_fops = {
2de5f059	342	.iterate = ecryptfs_readdir,
323ef68f	343	.read = generic_read_dir,
c43f7b8f TH	344	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	345	#ifdef CONFIG_COMPAT
	346	.compat_ioctl = ecryptfs_compat_ioctl,
	347	#endif
237fead6 MH	348	.open = ecryptfs_open,
	349	.flush = ecryptfs_flush,
	350	.release = ecryptfs_release,
	351	.fsync = ecryptfs_fsync,
	352	.fasync = ecryptfs_fasync,
e9f6a99c	353	.splice_read = generic_file_splice_read,
6038f373	354	.llseek = default_llseek,
237fead6 MH	355	};
	356
	357	const struct file_operations ecryptfs_main_fops = {
53a2731f	358	.llseek = generic_file_llseek,
237fead6 MH	359	.read = do_sync_read,
	360	.aio_read = ecryptfs_read_update_atime,
	361	.write = do_sync_write,
	362	.aio_write = generic_file_aio_write,
2de5f059	363	.iterate = ecryptfs_readdir,
c43f7b8f TH	364	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	365	#ifdef CONFIG_COMPAT
	366	.compat_ioctl = ecryptfs_compat_ioctl,
	367	#endif
821f7494	368	.mmap = generic_file_mmap,
237fead6 MH	369	.open = ecryptfs_open,
	370	.flush = ecryptfs_flush,
	371	.release = ecryptfs_release,
	372	.fsync = ecryptfs_fsync,
	373	.fasync = ecryptfs_fasync,
e9f6a99c	374	.splice_read = generic_file_splice_read,
237fead6	375	};