[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 "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 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;
}

static void ecryptfs_vma_close(struct vm_area_struct *vma)
{
	filemap_write_and_wait(vma->vm_file->f_mapping);
}

static const struct vm_operations_struct ecryptfs_file_vm_ops = {
	.close		= ecryptfs_vma_close,
	.fault		= filemap_fault,
};

static int ecryptfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	int rc;

	rc = generic_file_mmap(file, vma);
	if (!rc)
		vma->vm_ops = &ecryptfs_file_vm_ops;

	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);
	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;
	}
	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_put;
			}
			rc = 0;
			crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
					       | 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%.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)
{
	return file->f_mode & FMODE_WRITE
	       ? filemap_write_and_wait(file->f_mapping) : 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 = 0;

	rc = generic_file_fsync(file, start, end, datasync);
	if (rc)
		goto out;
	rc = vfs_fsync_range(ecryptfs_file_to_lower(file), start, end,
			     datasync);
out:
	return rc;
}

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

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

static 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,
	.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,
	.readdir = ecryptfs_readdir,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.mmap = ecryptfs_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>
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,
	47	const struct iovec *iov,
	48	unsigned long nr_segs, loff_t pos)
	49	{
38a708d7	50	ssize_t rc;
237fead6 MH	51	struct dentry *lower_dentry;
	52	struct vfsmount *lower_vfsmount;
	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) {
bd243a4b JJS	63	lower_dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
bd243a4b JJS	64	lower_vfsmount = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
237fead6 MH	65	touch_atime(lower_vfsmount, lower_dentry);
	66	}
	67	return rc;
	68	}
	69
	70	struct ecryptfs_getdents_callback {
	71	void *dirent;
	72	struct dentry *dentry;
	73	filldir_t filldir;
237fead6 MH	74	int filldir_called;
	75	int entries_written;
	76	};
	77
7d6c7045	78	/* Inspired by generic filldir in fs/readdir.c */
237fead6	79	static int
addd65ad MH	80	ecryptfs_filldir(void dirent, const char lower_name, int lower_namelen,
addd65ad MH	81	loff_t offset, u64 ino, unsigned int d_type)
237fead6	82	{
237fead6 MH	83	struct ecryptfs_getdents_callback *buf =
237fead6 MH	84	(struct ecryptfs_getdents_callback *)dirent;
a8f12864	85	size_t name_size;
addd65ad	86	char *name;
237fead6	87	int rc;
237fead6	88
237fead6	89	buf->filldir_called++;
addd65ad MH	90	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
	91	buf->dentry, lower_name,
	92	lower_namelen);
	93	if (rc) {
	94	printk(KERN_ERR "%s: Error attempting to decode and decrypt "
	95	"filename [%s]; rc = [%d]\n", __func__, lower_name,
	96	rc);
237fead6 MH	97	goto out;
237fead6 MH	98	}
addd65ad MH	99	rc = buf->filldir(buf->dirent, name, name_size, offset, ino, d_type);
addd65ad MH	100	kfree(name);
237fead6 MH	101	if (rc >= 0)
	102	buf->entries_written++;
	103	out:
	104	return rc;
	105	}
	106
	107	/**
	108	* ecryptfs_readdir
addd65ad MH	109	* @file: The eCryptfs directory file
addd65ad MH	110	* @dirent: Directory entry handle
237fead6 MH	111	* @filldir: The filldir callback function
	112	*/
	113	static int ecryptfs_readdir(struct file file, void dirent, filldir_t filldir)
	114	{
	115	int rc;
	116	struct file *lower_file;
	117	struct inode *inode;
	118	struct ecryptfs_getdents_callback buf;
	119
	120	lower_file = ecryptfs_file_to_lower(file);
	121	lower_file->f_pos = file->f_pos;
bd243a4b	122	inode = file->f_path.dentry->d_inode;
237fead6 MH	123	memset(&buf, 0, sizeof(buf));
237fead6 MH	124	buf.dirent = dirent;
bd243a4b	125	buf.dentry = file->f_path.dentry;
237fead6	126	buf.filldir = filldir;
237fead6 MH	127	buf.filldir_called = 0;
237fead6 MH	128	buf.entries_written = 0;
237fead6	129	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
237fead6	130	file->f_pos = lower_file->f_pos;
7d6c7045 MH	131	if (rc < 0)
	132	goto out;
	133	if (buf.filldir_called && !buf.entries_written)
	134	goto out;
237fead6	135	if (rc >= 0)
7d6c7045 MH	136	fsstack_copy_attr_atime(inode,
	137	lower_file->f_path.dentry->d_inode);
	138	out:
237fead6 MH	139	return rc;
	140	}
	141
32001d6f TH	142	static void ecryptfs_vma_close(struct vm_area_struct *vma)
	143	{
	144	filemap_write_and_wait(vma->vm_file->f_mapping);
	145	}
	146
	147	static const struct vm_operations_struct ecryptfs_file_vm_ops = {
	148	.close = ecryptfs_vma_close,
	149	.fault = filemap_fault,
	150	};
	151
	152	static int ecryptfs_file_mmap(struct file file, struct vm_area_struct vma)
	153	{
	154	int rc;
	155
	156	rc = generic_file_mmap(file, vma);
	157	if (!rc)
	158	vma->vm_ops = &ecryptfs_file_vm_ops;
	159
	160	return rc;
	161	}
	162
237fead6 MH	163	struct kmem_cache *ecryptfs_file_info_cache;
	164
	165	/**
	166	* ecryptfs_open
	167	* @inode: inode speciying file to open
	168	* @file: Structure to return filled in
	169	*
	170	* Opens the file specified by inode.
	171	*
	172	* Returns zero on success; non-zero otherwise
	173	*/
	174	static int ecryptfs_open(struct inode inode, struct file file)
	175	{
	176	int rc = 0;
	177	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	178	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
bd243a4b	179	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	180	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	181	* ecryptfs_lookup() */
4aa25bcb	182	struct dentry *lower_dentry;
237fead6	183	struct ecryptfs_file_info *file_info;
237fead6	184
e77a56dd MH	185	mount_crypt_stat = &ecryptfs_superblock_to_private(
	186	ecryptfs_dentry->d_sb)->mount_crypt_stat;
	187	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	188	&& ((file->f_flags & O_WRONLY) \|\| (file->f_flags & O_RDWR)
	189	\|\| (file->f_flags & O_CREAT) \|\| (file->f_flags & O_TRUNC)
	190	\|\| (file->f_flags & O_APPEND))) {
	191	printk(KERN_WARNING "Mount has encrypted view enabled; "
	192	"files may only be read\n");
	193	rc = -EPERM;
	194	goto out;
	195	}
237fead6	196	/* Released in ecryptfs_release or end of function if failure */
c3762229	197	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	198	ecryptfs_set_file_private(file, file_info);
	199	if (!file_info) {
	200	ecryptfs_printk(KERN_ERR,
	201	"Error attempting to allocate memory\n");
	202	rc = -ENOMEM;
	203	goto out;
	204	}
237fead6 MH	205	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
237fead6 MH	206	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	207	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	208	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	209	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	210	/* Policy code enabled in future release */
2ed92554 MH	211	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	212	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	213	}
237fead6 MH	214	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	215	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	216	if (rc) {
27992890 RS	217	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	218	"the lower file for the dentry with name "
27992890 RS	219	"[%s]; rc = [%d]\n", __func__,
	220	ecryptfs_dentry->d_name.name, rc);
	221	goto out_free;
72b55fff	222	}
0abe1169 RS	223	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	224	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	225	rc = -EPERM;
332ab16f	226	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	227	"file must hence be opened RO\n", __func__);
332ab16f	228	goto out_put;
e27759d7	229	}
2ed92554 MH	230	ecryptfs_set_file_lower(
2ed92554 MH	231	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	232	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	233	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	234	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	235	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	236	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	237	rc = 0;
	238	goto out;
	239	}
	240	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec MH	241	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
e2bd99ec MH	242	\|\| !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
d7cdc5fe	243	rc = ecryptfs_read_metadata(ecryptfs_dentry);
237fead6 MH	244	if (rc) {
	245	ecryptfs_printk(KERN_DEBUG,
	246	"Valid headers not found\n");
	247	if (!(mount_crypt_stat->flags
	248	& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
	249	rc = -EIO;
25bd8174	250	printk(KERN_WARNING "Either the lower file "
237fead6	251	"is not in a valid eCryptfs format, "
25bd8174 MH	252	"or the key could not be retrieved. "
25bd8174 MH	253	"Plaintext passthrough mode is not "
237fead6 MH	254	"enabled; returning -EIO\n");
237fead6 MH	255	mutex_unlock(&crypt_stat->cs_mutex);
332ab16f	256	goto out_put;
237fead6	257	}
237fead6	258	rc = 0;
3aeb86ea TH	259	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
3aeb86ea TH	260	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	261	mutex_unlock(&crypt_stat->cs_mutex);
	262	goto out;
	263	}
	264	}
	265	mutex_unlock(&crypt_stat->cs_mutex);
888d57bb JP	266	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	267	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	268	(unsigned long long)i_size_read(inode));
237fead6	269	goto out;
332ab16f TH	270	out_put:
332ab16f TH	271	ecryptfs_put_lower_file(inode);
2ed92554	272	out_free:
237fead6 MH	273	kmem_cache_free(ecryptfs_file_info_cache,
	274	ecryptfs_file_to_private(file));
	275	out:
	276	return rc;
	277	}
	278
	279	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	280	{
332ab16f TH	281	return file->f_mode & FMODE_WRITE
332ab16f TH	282	? filemap_write_and_wait(file->f_mapping) : 0;
237fead6 MH	283	}
	284
	285	static int ecryptfs_release(struct inode inode, struct file file)
	286	{
332ab16f	287	ecryptfs_put_lower_file(inode);
2ed92554 MH	288	kmem_cache_free(ecryptfs_file_info_cache,
	289	ecryptfs_file_to_private(file));
	290	return 0;
237fead6 MH	291	}
	292
	293	static int
02c24a82	294	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	295	{
57db4e8d TL	296	int rc = 0;
57db4e8d TL	297
02c24a82	298	rc = generic_file_fsync(file, start, end, datasync);
57db4e8d TL	299	if (rc)
57db4e8d TL	300	goto out;
02c24a82 JB	301	rc = vfs_fsync_range(ecryptfs_file_to_lower(file), start, end,
02c24a82 JB	302	datasync);
57db4e8d TL	303	out:
57db4e8d TL	304	return rc;
237fead6 MH	305	}
	306
	307	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	308	{
	309	int rc = 0;
	310	struct file *lower_file = NULL;
	311
	312	lower_file = ecryptfs_file_to_lower(file);
	313	if (lower_file->f_op && lower_file->f_op->fasync)
	314	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	315	return rc;
	316	}
	317
c43f7b8f TH	318	static long
	319	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	320	{
	321	struct file *lower_file = NULL;
	322	long rc = -ENOTTY;
	323
	324	if (ecryptfs_file_to_private(file))
	325	lower_file = ecryptfs_file_to_lower(file);
	326	if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
	327	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	328	return rc;
	329	}
	330
	331	#ifdef CONFIG_COMPAT
	332	static long
	333	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	334	{
	335	struct file *lower_file = NULL;
	336	long rc = -ENOIOCTLCMD;
	337
	338	if (ecryptfs_file_to_private(file))
	339	lower_file = ecryptfs_file_to_lower(file);
	340	if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
	341	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	342	return rc;
	343	}
	344	#endif
237fead6 MH	345
	346	const struct file_operations ecryptfs_dir_fops = {
	347	.readdir = ecryptfs_readdir,
323ef68f	348	.read = generic_read_dir,
c43f7b8f TH	349	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	350	#ifdef CONFIG_COMPAT
	351	.compat_ioctl = ecryptfs_compat_ioctl,
	352	#endif
237fead6 MH	353	.open = ecryptfs_open,
	354	.flush = ecryptfs_flush,
	355	.release = ecryptfs_release,
	356	.fsync = ecryptfs_fsync,
	357	.fasync = ecryptfs_fasync,
e9f6a99c	358	.splice_read = generic_file_splice_read,
6038f373	359	.llseek = default_llseek,
237fead6 MH	360	};
	361
	362	const struct file_operations ecryptfs_main_fops = {
53a2731f	363	.llseek = generic_file_llseek,
237fead6 MH	364	.read = do_sync_read,
	365	.aio_read = ecryptfs_read_update_atime,
	366	.write = do_sync_write,
	367	.aio_write = generic_file_aio_write,
	368	.readdir = ecryptfs_readdir,
c43f7b8f TH	369	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	370	#ifdef CONFIG_COMPAT
	371	.compat_ioctl = ecryptfs_compat_ioctl,
	372	#endif
32001d6f	373	.mmap = ecryptfs_file_mmap,
237fead6 MH	374	.open = ecryptfs_open,
	375	.flush = ecryptfs_flush,
	376	.release = ecryptfs_release,
	377	.fsync = ecryptfs_fsync,
	378	.fasync = ecryptfs_fasync,
e9f6a99c	379	.splice_read = generic_file_splice_read,
237fead6	380	};