[linux-2.6-block.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 "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);
	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) {
		if (rc != -EINVAL) {
			ecryptfs_printk(KERN_DEBUG,
					"%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
					__func__, lower_name, rc);
			return rc;
		}

		/* Mask -EINVAL errors as these are most likely due a plaintext
		 * filename present in the lower filesystem despite filename
		 * encryption being enabled. One unavoidable example would be
		 * the "lost+found" dentry in the root directory of an Ext4
		 * filesystem.
		 */
		return 0;
	}

	buf->caller->pos = buf->ctx.pos;
	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
	kfree(name);
	if (!rc)
		buf->entries_written++;

	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);
	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 = d_inode(dentry);
	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;
}

static int ecryptfs_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct file *lower_file = ecryptfs_file_to_lower(file);
	/*
	 * Don't allow mmap on top of file systems that don't support it
	 * natively.  If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
	 * allows recursive mounting, this will need to be extended.
	 */
	if (!lower_file->f_op->mmap)
		return -ENODEV;
	return generic_file_mmap(file, vma);
}

/**
 * ecryptfs_open
 * @inode: inode specifying 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);
	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;
}

/**
 * ecryptfs_dir_open
 * @inode: inode specifying 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_dir_open(struct inode *inode, struct file *file)
{
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct ecryptfs_file_info *file_info;
	struct file *lower_file;

	/* 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 (unlikely(!file_info)) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		return -ENOMEM;
	}
	lower_file = dentry_open(ecryptfs_dentry_to_lower_path(ecryptfs_dentry),
				 file->f_flags, current_cred());
	if (IS_ERR(lower_file)) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the lower file for the dentry with name "
			"[%pd]; rc = [%ld]\n", __func__,
			ecryptfs_dentry, PTR_ERR(lower_file));
		kmem_cache_free(ecryptfs_file_info_cache, file_info);
		return PTR_ERR(lower_file);
	}
	ecryptfs_set_file_lower(file, lower_file);
	return 0;
}

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_dir_release(struct inode *inode, struct file *file)
{
	fput(ecryptfs_file_to_lower(file));
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
	return 0;
}

static loff_t ecryptfs_dir_llseek(struct file *file, loff_t offset, int whence)
{
	return vfs_llseek(ecryptfs_file_to_lower(file), offset, whence);
}

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

	rc = file_write_and_wait(file);
	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)
		return rc;

	switch (cmd) {
	case FITRIM:
	case FS_IOC_GETFLAGS:
	case FS_IOC_SETFLAGS:
	case FS_IOC_GETVERSION:
	case FS_IOC_SETVERSION:
		rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
		fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));

		return rc;
	default:
		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)
		return rc;

	switch (cmd) {
	case FS_IOC32_GETFLAGS:
	case FS_IOC32_SETFLAGS:
	case FS_IOC32_GETVERSION:
	case FS_IOC32_SETVERSION:
		rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
		fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));

		return rc;
	default:
		return rc;
	}
}
#endif

const struct file_operations ecryptfs_dir_fops = {
	.iterate_shared = ecryptfs_readdir,
	.read = generic_read_dir,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.open = ecryptfs_dir_open,
	.release = ecryptfs_dir_release,
	.fsync = ecryptfs_fsync,
	.llseek = ecryptfs_dir_llseek,
};

const struct file_operations ecryptfs_main_fops = {
	.llseek = generic_file_llseek,
	.read_iter = ecryptfs_read_update_atime,
	.write_iter = generic_file_write_iter,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.mmap = ecryptfs_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>
237fead6 MH	34	#include "ecryptfs_kernel.h"
237fead6 MH	35
237fead6 MH	36	/**
	37	* ecryptfs_read_update_atime
	38	*
	39	* generic_file_read updates the atime of upper layer inode. But, it
	40	* doesn't give us a chance to update the atime of the lower layer
	41	* inode. This function is a wrapper to generic_file_read. It
	42	* updates the atime of the lower level inode if generic_file_read
	43	* returns without any errors. This is to be used only for file reads.
	44	* The function to be used for directory reads is ecryptfs_read.
	45	*/
	46	static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
02797829	47	struct iov_iter *to)
237fead6	48	{
38a708d7	49	ssize_t rc;
cc18ec3c	50	struct path *path;
237fead6 MH	51	struct file *file = iocb->ki_filp;
237fead6 MH	52
02797829	53	rc = generic_file_read_iter(iocb, to);
237fead6	54	if (rc >= 0) {
cc18ec3c MW	55	path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
cc18ec3c MW	56	touch_atime(path);
237fead6 MH	57	}
	58	return rc;
	59	}
	60
	61	struct ecryptfs_getdents_callback {
5c0ba4e0	62	struct dir_context ctx;
2de5f059	63	struct dir_context *caller;
0747fdb2	64	struct super_block *sb;
237fead6 MH	65	int filldir_called;
	66	int entries_written;
	67	};
	68
7d6c7045	69	/* Inspired by generic filldir in fs/readdir.c */
237fead6	70	static int
ac7576f4 MS	71	ecryptfs_filldir(struct dir_context ctx, const char lower_name,
ac7576f4 MS	72	int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
237fead6	73	{
237fead6	74	struct ecryptfs_getdents_callback *buf =
ac7576f4	75	container_of(ctx, struct ecryptfs_getdents_callback, ctx);
a8f12864	76	size_t name_size;
addd65ad	77	char *name;
237fead6	78	int rc;
237fead6	79
237fead6	80	buf->filldir_called++;
addd65ad	81	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
0747fdb2	82	buf->sb, lower_name,
addd65ad MH	83	lower_namelen);
addd65ad MH	84	if (rc) {
e86281e7 TH	85	if (rc != -EINVAL) {
	86	ecryptfs_printk(KERN_DEBUG,
	87	"%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
	88	__func__, lower_name, rc);
	89	return rc;
	90	}
	91
	92	/* Mask -EINVAL errors as these are most likely due a plaintext
	93	* filename present in the lower filesystem despite filename
	94	* encryption being enabled. One unavoidable example would be
	95	* the "lost+found" dentry in the root directory of an Ext4
	96	* filesystem.
	97	*/
	98	return 0;
237fead6	99	}
e86281e7	100
2de5f059 AV	101	buf->caller->pos = buf->ctx.pos;
2de5f059 AV	102	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
addd65ad	103	kfree(name);
2de5f059	104	if (!rc)
237fead6	105	buf->entries_written++;
e86281e7	106
237fead6 MH	107	return rc;
	108	}
	109
	110	/**
	111	* ecryptfs_readdir
addd65ad	112	* @file: The eCryptfs directory file
2de5f059	113	* @ctx: The actor to feed the entries to
237fead6	114	*/
2de5f059	115	static int ecryptfs_readdir(struct file file, struct dir_context ctx)
237fead6 MH	116	{
	117	int rc;
	118	struct file *lower_file;
0747fdb2	119	struct inode *inode = file_inode(file);
2de5f059 AV	120	struct ecryptfs_getdents_callback buf = {
	121	.ctx.actor = ecryptfs_filldir,
	122	.caller = ctx,
0747fdb2	123	.sb = inode->i_sb,
2de5f059	124	};
237fead6	125	lower_file = ecryptfs_file_to_lower(file);
5c0ba4e0	126	rc = iterate_dir(lower_file, &buf.ctx);
2de5f059	127	ctx->pos = buf.ctx.pos;
7d6c7045 MH	128	if (rc < 0)
	129	goto out;
	130	if (buf.filldir_called && !buf.entries_written)
	131	goto out;
237fead6	132	if (rc >= 0)
7d6c7045	133	fsstack_copy_attr_atime(inode,
496ad9aa	134	file_inode(lower_file));
7d6c7045	135	out:
237fead6 MH	136	return rc;
	137	}
	138
	139	struct kmem_cache *ecryptfs_file_info_cache;
	140
e3ccaa97 TH	141	static int read_or_initialize_metadata(struct dentry *dentry)
e3ccaa97 TH	142	{
2b0143b5	143	struct inode *inode = d_inode(dentry);
e3ccaa97 TH	144	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	145	struct ecryptfs_crypt_stat *crypt_stat;
	146	int rc;
	147
	148	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	149	mount_crypt_stat = &ecryptfs_superblock_to_private(
	150	inode->i_sb)->mount_crypt_stat;
	151	mutex_lock(&crypt_stat->cs_mutex);
	152
	153	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	154	crypt_stat->flags & ECRYPTFS_KEY_VALID) {
	155	rc = 0;
	156	goto out;
	157	}
	158
	159	rc = ecryptfs_read_metadata(dentry);
	160	if (!rc)
	161	goto out;
	162
	163	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
	164	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
	165	\| ECRYPTFS_ENCRYPTED);
	166	rc = 0;
	167	goto out;
	168	}
	169
	170	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	171	!i_size_read(ecryptfs_inode_to_lower(inode))) {
	172	rc = ecryptfs_initialize_file(dentry, inode);
	173	if (!rc)
	174	goto out;
	175	}
	176
	177	rc = -EIO;
	178	out:
	179	mutex_unlock(&crypt_stat->cs_mutex);
	180	return rc;
	181	}
	182
f0fe970d JM	183	static int ecryptfs_mmap(struct file file, struct vm_area_struct vma)
	184	{
	185	struct file *lower_file = ecryptfs_file_to_lower(file);
	186	/*
	187	* Don't allow mmap on top of file systems that don't support it
	188	* natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
	189	* allows recursive mounting, this will need to be extended.
	190	*/
	191	if (!lower_file->f_op->mmap)
	192	return -ENODEV;
	193	return generic_file_mmap(file, vma);
	194	}
	195
237fead6 MH	196	/**
237fead6 MH	197	* ecryptfs_open
40f0fd37	198	* @inode: inode specifying file to open
237fead6 MH	199	* @file: Structure to return filled in
	200	*
	201	* Opens the file specified by inode.
	202	*
	203	* Returns zero on success; non-zero otherwise
	204	*/
	205	static int ecryptfs_open(struct inode inode, struct file file)
	206	{
	207	int rc = 0;
	208	struct ecryptfs_crypt_stat *crypt_stat = NULL;
bd243a4b	209	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	210	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	211	* ecryptfs_lookup() */
237fead6	212	struct ecryptfs_file_info *file_info;
237fead6 MH	213
237fead6 MH	214	/* Released in ecryptfs_release or end of function if failure */
c3762229	215	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	216	ecryptfs_set_file_private(file, file_info);
	217	if (!file_info) {
	218	ecryptfs_printk(KERN_ERR,
	219	"Error attempting to allocate memory\n");
	220	rc = -ENOMEM;
	221	goto out;
	222	}
237fead6	223	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	224	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	225	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	226	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	227	/* Policy code enabled in future release */
2ed92554 MH	228	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	229	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	230	}
237fead6 MH	231	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	232	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	233	if (rc) {
27992890 RS	234	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	235	"the lower file for the dentry with name "
9e78d14a DH	236	"[%pd]; rc = [%d]\n", __func__,
9e78d14a DH	237	ecryptfs_dentry, rc);
27992890	238	goto out_free;
72b55fff	239	}
0abe1169 RS	240	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	241	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	242	rc = -EPERM;
332ab16f	243	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	244	"file must hence be opened RO\n", __func__);
332ab16f	245	goto out_put;
e27759d7	246	}
2ed92554 MH	247	ecryptfs_set_file_lower(
2ed92554 MH	248	file, ecryptfs_inode_to_private(inode)->lower_file);
e3ccaa97 TH	249	rc = read_or_initialize_metadata(ecryptfs_dentry);
	250	if (rc)
	251	goto out_put;
888d57bb JP	252	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	253	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	254	(unsigned long long)i_size_read(inode));
237fead6	255	goto out;
332ab16f TH	256	out_put:
332ab16f TH	257	ecryptfs_put_lower_file(inode);
2ed92554	258	out_free:
237fead6 MH	259	kmem_cache_free(ecryptfs_file_info_cache,
	260	ecryptfs_file_to_private(file));
	261	out:
	262	return rc;
	263	}
	264
6a480a78 AV	265	/**
6a480a78 AV	266	* ecryptfs_dir_open
40f0fd37	267	* @inode: inode specifying file to open
6a480a78 AV	268	* @file: Structure to return filled in
	269	*
	270	* Opens the file specified by inode.
	271	*
	272	* Returns zero on success; non-zero otherwise
	273	*/
	274	static int ecryptfs_dir_open(struct inode inode, struct file file)
	275	{
	276	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	277	/* Private value of ecryptfs_dentry allocated in
	278	* ecryptfs_lookup() */
	279	struct ecryptfs_file_info *file_info;
	280	struct file *lower_file;
	281
	282	/* Released in ecryptfs_release or end of function if failure */
	283	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	284	ecryptfs_set_file_private(file, file_info);
	285	if (unlikely(!file_info)) {
	286	ecryptfs_printk(KERN_ERR,
	287	"Error attempting to allocate memory\n");
	288	return -ENOMEM;
	289	}
	290	lower_file = dentry_open(ecryptfs_dentry_to_lower_path(ecryptfs_dentry),
	291	file->f_flags, current_cred());
	292	if (IS_ERR(lower_file)) {
	293	printk(KERN_ERR "%s: Error attempting to initialize "
	294	"the lower file for the dentry with name "
	295	"[%pd]; rc = [%ld]\n", __func__,
	296	ecryptfs_dentry, PTR_ERR(lower_file));
	297	kmem_cache_free(ecryptfs_file_info_cache, file_info);
	298	return PTR_ERR(lower_file);
	299	}
	300	ecryptfs_set_file_lower(file, lower_file);
	301	return 0;
	302	}
	303
237fead6 MH	304	static int ecryptfs_flush(struct file *file, fl_owner_t td)
237fead6 MH	305	{
64e6651d TH	306	struct file *lower_file = ecryptfs_file_to_lower(file);
64e6651d TH	307
72c2d531	308	if (lower_file->f_op->flush) {
64e6651d TH	309	filemap_write_and_wait(file->f_mapping);
	310	return lower_file->f_op->flush(lower_file, td);
	311	}
	312
	313	return 0;
237fead6 MH	314	}
	315
	316	static int ecryptfs_release(struct inode inode, struct file file)
	317	{
332ab16f	318	ecryptfs_put_lower_file(inode);
2ed92554 MH	319	kmem_cache_free(ecryptfs_file_info_cache,
	320	ecryptfs_file_to_private(file));
	321	return 0;
237fead6 MH	322	}
237fead6 MH	323
6a480a78 AV	324	static int ecryptfs_dir_release(struct inode inode, struct file file)
	325	{
	326	fput(ecryptfs_file_to_lower(file));
	327	kmem_cache_free(ecryptfs_file_info_cache,
	328	ecryptfs_file_to_private(file));
	329	return 0;
	330	}
	331
	332	static loff_t ecryptfs_dir_llseek(struct file *file, loff_t offset, int whence)
	333	{
	334	return vfs_llseek(ecryptfs_file_to_lower(file), offset, whence);
	335	}
	336
237fead6	337	static int
02c24a82	338	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	339	{
bc5abcf7 TH	340	int rc;
bc5abcf7 TH	341
6d4b5124	342	rc = file_write_and_wait(file);
bc5abcf7 TH	343	if (rc)
	344	return rc;
	345
821f7494	346	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	347	}
	348
	349	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	350	{
	351	int rc = 0;
	352	struct file *lower_file = NULL;
	353
	354	lower_file = ecryptfs_file_to_lower(file);
72c2d531	355	if (lower_file->f_op->fasync)
237fead6 MH	356	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	357	return rc;
	358	}
	359
c43f7b8f TH	360	static long
	361	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	362	{
2000f5be	363	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	364	long rc = -ENOTTY;
c43f7b8f TH	365
6d65261a TH	366	if (!lower_file->f_op->unlocked_ioctl)
	367	return rc;
	368
	369	switch (cmd) {
	370	case FITRIM:
	371	case FS_IOC_GETFLAGS:
	372	case FS_IOC_SETFLAGS:
	373	case FS_IOC_GETVERSION:
	374	case FS_IOC_SETVERSION:
c43f7b8f	375	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
6d65261a TH	376	fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
	377
	378	return rc;
	379	default:
	380	return rc;
	381	}
c43f7b8f TH	382	}
	383
	384	#ifdef CONFIG_COMPAT
	385	static long
	386	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	387	{
2000f5be	388	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	389	long rc = -ENOIOCTLCMD;
c43f7b8f TH	390
6d65261a TH	391	if (!lower_file->f_op->compat_ioctl)
	392	return rc;
	393
	394	switch (cmd) {
6d65261a TH	395	case FS_IOC32_GETFLAGS:
	396	case FS_IOC32_SETFLAGS:
	397	case FS_IOC32_GETVERSION:
	398	case FS_IOC32_SETVERSION:
c43f7b8f	399	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
6d65261a TH	400	fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
	401
	402	return rc;
	403	default:
	404	return rc;
	405	}
c43f7b8f TH	406	}
c43f7b8f TH	407	#endif
237fead6 MH	408
237fead6 MH	409	const struct file_operations ecryptfs_dir_fops = {
51a16a9c	410	.iterate_shared = ecryptfs_readdir,
323ef68f	411	.read = generic_read_dir,
c43f7b8f TH	412	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	413	#ifdef CONFIG_COMPAT
	414	.compat_ioctl = ecryptfs_compat_ioctl,
	415	#endif
6a480a78 AV	416	.open = ecryptfs_dir_open,
6a480a78 AV	417	.release = ecryptfs_dir_release,
237fead6	418	.fsync = ecryptfs_fsync,
6a480a78	419	.llseek = ecryptfs_dir_llseek,
237fead6 MH	420	};
	421
	422	const struct file_operations ecryptfs_main_fops = {
53a2731f	423	.llseek = generic_file_llseek,
02797829	424	.read_iter = ecryptfs_read_update_atime,
8174202b	425	.write_iter = generic_file_write_iter,
c43f7b8f TH	426	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	427	#ifdef CONFIG_COMPAT
	428	.compat_ioctl = ecryptfs_compat_ioctl,
	429	#endif
f0fe970d	430	.mmap = ecryptfs_mmap,
237fead6 MH	431	.open = ecryptfs_open,
	432	.flush = ecryptfs_flush,
	433	.release = ecryptfs_release,
	434	.fsync = ecryptfs_fsync,
	435	.fasync = ecryptfs_fasync,
e9f6a99c	436	.splice_read = generic_file_splice_read,
237fead6	437	};