[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 path lower;
	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.mnt = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
		touch_atime(&lower);
	}
	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;
68ac1234	51	struct path lower;
237fead6 MH	52	struct file *file = iocb->ki_filp;
	53
	54	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
	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) {
68ac1234 AV	62	lower.dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
	63	lower.mnt = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
	64	touch_atime(&lower);
237fead6 MH	65	}
	66	return rc;
	67	}
	68
	69	struct ecryptfs_getdents_callback {
	70	void *dirent;
	71	struct dentry *dentry;
	72	filldir_t filldir;
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 MH	89	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
	90	buf->dentry, lower_name,
	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	}
addd65ad MH	98	rc = buf->filldir(buf->dirent, name, name_size, offset, ino, d_type);
addd65ad MH	99	kfree(name);
237fead6 MH	100	if (rc >= 0)
	101	buf->entries_written++;
	102	out:
	103	return rc;
	104	}
	105
	106	/**
	107	* ecryptfs_readdir
addd65ad MH	108	* @file: The eCryptfs directory file
addd65ad MH	109	* @dirent: Directory entry handle
237fead6 MH	110	* @filldir: The filldir callback function
	111	*/
	112	static int ecryptfs_readdir(struct file file, void dirent, filldir_t filldir)
	113	{
	114	int rc;
	115	struct file *lower_file;
	116	struct inode *inode;
	117	struct ecryptfs_getdents_callback buf;
	118
	119	lower_file = ecryptfs_file_to_lower(file);
	120	lower_file->f_pos = file->f_pos;
bd243a4b	121	inode = file->f_path.dentry->d_inode;
237fead6 MH	122	memset(&buf, 0, sizeof(buf));
237fead6 MH	123	buf.dirent = dirent;
bd243a4b	124	buf.dentry = file->f_path.dentry;
237fead6	125	buf.filldir = filldir;
237fead6 MH	126	buf.filldir_called = 0;
237fead6 MH	127	buf.entries_written = 0;
237fead6	128	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
237fead6	129	file->f_pos = lower_file->f_pos;
7d6c7045 MH	130	if (rc < 0)
	131	goto out;
	132	if (buf.filldir_called && !buf.entries_written)
	133	goto out;
237fead6	134	if (rc >= 0)
7d6c7045 MH	135	fsstack_copy_attr_atime(inode,
	136	lower_file->f_path.dentry->d_inode);
	137	out:
237fead6 MH	138	return rc;
	139	}
	140
32001d6f TH	141	static void ecryptfs_vma_close(struct vm_area_struct *vma)
	142	{
	143	filemap_write_and_wait(vma->vm_file->f_mapping);
	144	}
	145
	146	static const struct vm_operations_struct ecryptfs_file_vm_ops = {
	147	.close = ecryptfs_vma_close,
	148	.fault = filemap_fault,
	149	};
	150
	151	static int ecryptfs_file_mmap(struct file file, struct vm_area_struct vma)
	152	{
	153	int rc;
	154
	155	rc = generic_file_mmap(file, vma);
	156	if (!rc)
	157	vma->vm_ops = &ecryptfs_file_vm_ops;
	158
	159	return rc;
	160	}
	161
237fead6 MH	162	struct kmem_cache *ecryptfs_file_info_cache;
	163
	164	/**
	165	* ecryptfs_open
	166	* @inode: inode speciying file to open
	167	* @file: Structure to return filled in
	168	*
	169	* Opens the file specified by inode.
	170	*
	171	* Returns zero on success; non-zero otherwise
	172	*/
	173	static int ecryptfs_open(struct inode inode, struct file file)
	174	{
	175	int rc = 0;
	176	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	177	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
bd243a4b	178	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	179	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	180	* ecryptfs_lookup() */
4aa25bcb	181	struct dentry *lower_dentry;
237fead6	182	struct ecryptfs_file_info *file_info;
237fead6	183
e77a56dd MH	184	mount_crypt_stat = &ecryptfs_superblock_to_private(
	185	ecryptfs_dentry->d_sb)->mount_crypt_stat;
	186	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	187	&& ((file->f_flags & O_WRONLY) \|\| (file->f_flags & O_RDWR)
	188	\|\| (file->f_flags & O_CREAT) \|\| (file->f_flags & O_TRUNC)
	189	\|\| (file->f_flags & O_APPEND))) {
	190	printk(KERN_WARNING "Mount has encrypted view enabled; "
	191	"files may only be read\n");
	192	rc = -EPERM;
	193	goto out;
	194	}
237fead6	195	/* Released in ecryptfs_release or end of function if failure */
c3762229	196	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	197	ecryptfs_set_file_private(file, file_info);
	198	if (!file_info) {
	199	ecryptfs_printk(KERN_ERR,
	200	"Error attempting to allocate memory\n");
	201	rc = -ENOMEM;
	202	goto out;
	203	}
237fead6 MH	204	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
237fead6 MH	205	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	206	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	207	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	208	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	209	/* Policy code enabled in future release */
2ed92554 MH	210	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	211	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	212	}
237fead6 MH	213	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	214	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	215	if (rc) {
27992890 RS	216	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	217	"the lower file for the dentry with name "
27992890 RS	218	"[%s]; rc = [%d]\n", __func__,
	219	ecryptfs_dentry->d_name.name, rc);
	220	goto out_free;
72b55fff	221	}
0abe1169 RS	222	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	223	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	224	rc = -EPERM;
332ab16f	225	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	226	"file must hence be opened RO\n", __func__);
332ab16f	227	goto out_put;
e27759d7	228	}
2ed92554 MH	229	ecryptfs_set_file_lower(
2ed92554 MH	230	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	231	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	232	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	233	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	234	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	235	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	236	rc = 0;
	237	goto out;
	238	}
	239	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec MH	240	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
e2bd99ec MH	241	\|\| !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
d7cdc5fe	242	rc = ecryptfs_read_metadata(ecryptfs_dentry);
237fead6 MH	243	if (rc) {
	244	ecryptfs_printk(KERN_DEBUG,
	245	"Valid headers not found\n");
	246	if (!(mount_crypt_stat->flags
	247	& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
	248	rc = -EIO;
25bd8174	249	printk(KERN_WARNING "Either the lower file "
237fead6	250	"is not in a valid eCryptfs format, "
25bd8174 MH	251	"or the key could not be retrieved. "
25bd8174 MH	252	"Plaintext passthrough mode is not "
237fead6 MH	253	"enabled; returning -EIO\n");
237fead6 MH	254	mutex_unlock(&crypt_stat->cs_mutex);
332ab16f	255	goto out_put;
237fead6	256	}
237fead6	257	rc = 0;
3aeb86ea TH	258	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
3aeb86ea TH	259	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	260	mutex_unlock(&crypt_stat->cs_mutex);
	261	goto out;
	262	}
	263	}
	264	mutex_unlock(&crypt_stat->cs_mutex);
888d57bb JP	265	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	266	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	267	(unsigned long long)i_size_read(inode));
237fead6	268	goto out;
332ab16f TH	269	out_put:
332ab16f TH	270	ecryptfs_put_lower_file(inode);
2ed92554	271	out_free:
237fead6 MH	272	kmem_cache_free(ecryptfs_file_info_cache,
	273	ecryptfs_file_to_private(file));
	274	out:
	275	return rc;
	276	}
	277
	278	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	279	{
332ab16f TH	280	return file->f_mode & FMODE_WRITE
332ab16f TH	281	? filemap_write_and_wait(file->f_mapping) : 0;
237fead6 MH	282	}
	283
	284	static int ecryptfs_release(struct inode inode, struct file file)
	285	{
332ab16f	286	ecryptfs_put_lower_file(inode);
2ed92554 MH	287	kmem_cache_free(ecryptfs_file_info_cache,
	288	ecryptfs_file_to_private(file));
	289	return 0;
237fead6 MH	290	}
	291
	292	static int
02c24a82	293	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	294	{
57db4e8d TL	295	int rc = 0;
57db4e8d TL	296
02c24a82	297	rc = generic_file_fsync(file, start, end, datasync);
57db4e8d TL	298	if (rc)
57db4e8d TL	299	goto out;
02c24a82 JB	300	rc = vfs_fsync_range(ecryptfs_file_to_lower(file), start, end,
02c24a82 JB	301	datasync);
57db4e8d TL	302	out:
57db4e8d TL	303	return rc;
237fead6 MH	304	}
	305
	306	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	307	{
	308	int rc = 0;
	309	struct file *lower_file = NULL;
	310
	311	lower_file = ecryptfs_file_to_lower(file);
	312	if (lower_file->f_op && lower_file->f_op->fasync)
	313	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	314	return rc;
	315	}
	316
c43f7b8f TH	317	static long
	318	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	319	{
	320	struct file *lower_file = NULL;
	321	long rc = -ENOTTY;
	322
	323	if (ecryptfs_file_to_private(file))
	324	lower_file = ecryptfs_file_to_lower(file);
	325	if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
	326	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	327	return rc;
	328	}
	329
	330	#ifdef CONFIG_COMPAT
	331	static long
	332	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	333	{
	334	struct file *lower_file = NULL;
	335	long rc = -ENOIOCTLCMD;
	336
	337	if (ecryptfs_file_to_private(file))
	338	lower_file = ecryptfs_file_to_lower(file);
	339	if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
	340	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	341	return rc;
	342	}
	343	#endif
237fead6 MH	344
	345	const struct file_operations ecryptfs_dir_fops = {
	346	.readdir = ecryptfs_readdir,
323ef68f	347	.read = generic_read_dir,
c43f7b8f TH	348	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	349	#ifdef CONFIG_COMPAT
	350	.compat_ioctl = ecryptfs_compat_ioctl,
	351	#endif
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,
6038f373	358	.llseek = default_llseek,
237fead6 MH	359	};
	360
	361	const struct file_operations ecryptfs_main_fops = {
53a2731f	362	.llseek = generic_file_llseek,
237fead6 MH	363	.read = do_sync_read,
	364	.aio_read = ecryptfs_read_update_atime,
	365	.write = do_sync_write,
	366	.aio_write = generic_file_aio_write,
	367	.readdir = ecryptfs_readdir,
c43f7b8f TH	368	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	369	#ifdef CONFIG_COMPAT
	370	.compat_ioctl = ecryptfs_compat_ioctl,
	371	#endif
32001d6f	372	.mmap = ecryptfs_file_mmap,
237fead6 MH	373	.open = ecryptfs_open,
	374	.flush = ecryptfs_flush,
	375	.release = ecryptfs_release,
	376	.fsync = ecryptfs_fsync,
	377	.fasync = ecryptfs_fasync,
e9f6a99c	378	.splice_read = generic_file_splice_read,
237fead6	379	};