[GitHub/mt8127/android_kernel_alcatel_ttab.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 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 {
	struct dir_context ctx;
	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_inode(file);
	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;
	buf.ctx.actor = ecryptfs_filldir;
	rc = iterate_dir(lower_file, &buf.ctx);
	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,
					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;
}

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 speciying file to open
 * @file: Structure to return filled in
 *
 * Opens the file specified by inode.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_open(struct inode *inode, struct file *file)
{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct ecryptfs_file_info *file_info;

	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the lower file for the dentry with name "
			"[%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 && 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 && 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_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;
68ac1234	52	struct path lower;
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) {
68ac1234 AV	63	lower.dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
	64	lower.mnt = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
	65	touch_atime(&lower);
237fead6 MH	66	}
	67	return rc;
	68	}
	69
	70	struct ecryptfs_getdents_callback {
0f837692	71	struct dir_context ctx;
237fead6 MH	72	void *dirent;
	73	struct dentry *dentry;
	74	filldir_t filldir;
237fead6 MH	75	int filldir_called;
	76	int entries_written;
	77	};
	78
7d6c7045	79	/* Inspired by generic filldir in fs/readdir.c */
237fead6	80	static int
addd65ad MH	81	ecryptfs_filldir(void dirent, const char lower_name, int lower_namelen,
addd65ad MH	82	loff_t offset, u64 ino, unsigned int d_type)
237fead6	83	{
237fead6 MH	84	struct ecryptfs_getdents_callback *buf =
237fead6 MH	85	(struct ecryptfs_getdents_callback *)dirent;
a8f12864	86	size_t name_size;
addd65ad	87	char *name;
237fead6	88	int rc;
237fead6	89
237fead6	90	buf->filldir_called++;
addd65ad MH	91	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
	92	buf->dentry, lower_name,
	93	lower_namelen);
	94	if (rc) {
	95	printk(KERN_ERR "%s: Error attempting to decode and decrypt "
	96	"filename [%s]; rc = [%d]\n", __func__, lower_name,
	97	rc);
237fead6 MH	98	goto out;
237fead6 MH	99	}
addd65ad MH	100	rc = buf->filldir(buf->dirent, name, name_size, offset, ino, d_type);
addd65ad MH	101	kfree(name);
237fead6 MH	102	if (rc >= 0)
	103	buf->entries_written++;
	104	out:
	105	return rc;
	106	}
	107
	108	/**
	109	* ecryptfs_readdir
addd65ad MH	110	* @file: The eCryptfs directory file
addd65ad MH	111	* @dirent: Directory entry handle
237fead6 MH	112	* @filldir: The filldir callback function
	113	*/
	114	static int ecryptfs_readdir(struct file file, void dirent, filldir_t filldir)
	115	{
	116	int rc;
	117	struct file *lower_file;
	118	struct inode *inode;
	119	struct ecryptfs_getdents_callback buf;
	120
	121	lower_file = ecryptfs_file_to_lower(file);
	122	lower_file->f_pos = file->f_pos;
496ad9aa	123	inode = file_inode(file);
237fead6 MH	124	memset(&buf, 0, sizeof(buf));
237fead6 MH	125	buf.dirent = dirent;
bd243a4b	126	buf.dentry = file->f_path.dentry;
237fead6	127	buf.filldir = filldir;
237fead6 MH	128	buf.filldir_called = 0;
237fead6 MH	129	buf.entries_written = 0;
0f837692 AV	130	buf.ctx.actor = ecryptfs_filldir;
0f837692 AV	131	rc = iterate_dir(lower_file, &buf.ctx);
237fead6	132	file->f_pos = lower_file->f_pos;
7d6c7045 MH	133	if (rc < 0)
	134	goto out;
	135	if (buf.filldir_called && !buf.entries_written)
	136	goto out;
237fead6	137	if (rc >= 0)
7d6c7045	138	fsstack_copy_attr_atime(inode,
496ad9aa	139	file_inode(lower_file));
7d6c7045	140	out:
237fead6 MH	141	return rc;
	142	}
	143
	144	struct kmem_cache *ecryptfs_file_info_cache;
	145
e3ccaa97 TH	146	static int read_or_initialize_metadata(struct dentry *dentry)
	147	{
	148	struct inode *inode = dentry->d_inode;
	149	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	150	struct ecryptfs_crypt_stat *crypt_stat;
	151	int rc;
	152
	153	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	154	mount_crypt_stat = &ecryptfs_superblock_to_private(
	155	inode->i_sb)->mount_crypt_stat;
	156	mutex_lock(&crypt_stat->cs_mutex);
	157
	158	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	159	crypt_stat->flags & ECRYPTFS_KEY_VALID) {
	160	rc = 0;
	161	goto out;
	162	}
	163
	164	rc = ecryptfs_read_metadata(dentry);
	165	if (!rc)
	166	goto out;
	167
	168	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
	169	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
	170	\| ECRYPTFS_ENCRYPTED);
	171	rc = 0;
	172	goto out;
	173	}
	174
	175	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	176	!i_size_read(ecryptfs_inode_to_lower(inode))) {
	177	rc = ecryptfs_initialize_file(dentry, inode);
	178	if (!rc)
	179	goto out;
	180	}
	181
	182	rc = -EIO;
	183	out:
	184	mutex_unlock(&crypt_stat->cs_mutex);
	185	return rc;
	186	}
	187
e5201134 JM	188	static int ecryptfs_mmap(struct file file, struct vm_area_struct vma)
	189	{
	190	struct file *lower_file = ecryptfs_file_to_lower(file);
	191	/*
	192	* Don't allow mmap on top of file systems that don't support it
	193	* natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
	194	* allows recursive mounting, this will need to be extended.
	195	*/
	196	if (!lower_file->f_op->mmap)
	197	return -ENODEV;
	198	return generic_file_mmap(file, vma);
	199	}
	200
237fead6 MH	201	/**
	202	* ecryptfs_open
	203	* @inode: inode speciying file to open
	204	* @file: Structure to return filled in
	205	*
	206	* Opens the file specified by inode.
	207	*
	208	* Returns zero on success; non-zero otherwise
	209	*/
	210	static int ecryptfs_open(struct inode inode, struct file file)
	211	{
	212	int rc = 0;
	213	struct ecryptfs_crypt_stat *crypt_stat = NULL;
bd243a4b	214	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	215	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	216	* ecryptfs_lookup() */
237fead6	217	struct ecryptfs_file_info *file_info;
237fead6 MH	218
237fead6 MH	219	/* Released in ecryptfs_release or end of function if failure */
c3762229	220	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	221	ecryptfs_set_file_private(file, file_info);
	222	if (!file_info) {
	223	ecryptfs_printk(KERN_ERR,
	224	"Error attempting to allocate memory\n");
	225	rc = -ENOMEM;
	226	goto out;
	227	}
237fead6	228	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	229	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	230	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	231	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	232	/* Policy code enabled in future release */
2ed92554 MH	233	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	234	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	235	}
237fead6 MH	236	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	237	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	238	if (rc) {
27992890 RS	239	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	240	"the lower file for the dentry with name "
27992890 RS	241	"[%s]; rc = [%d]\n", __func__,
	242	ecryptfs_dentry->d_name.name, rc);
	243	goto out_free;
72b55fff	244	}
0abe1169 RS	245	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	246	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	247	rc = -EPERM;
332ab16f	248	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	249	"file must hence be opened RO\n", __func__);
332ab16f	250	goto out_put;
e27759d7	251	}
2ed92554 MH	252	ecryptfs_set_file_lower(
2ed92554 MH	253	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	254	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	255	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	256	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	257	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	258	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	259	rc = 0;
	260	goto out;
	261	}
e3ccaa97 TH	262	rc = read_or_initialize_metadata(ecryptfs_dentry);
	263	if (rc)
	264	goto out_put;
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	{
64e6651d TH	280	struct file *lower_file = ecryptfs_file_to_lower(file);
	281
	282	if (lower_file->f_op && lower_file->f_op->flush) {
	283	filemap_write_and_wait(file->f_mapping);
	284	return lower_file->f_op->flush(lower_file, td);
	285	}
	286
	287	return 0;
237fead6 MH	288	}
	289
	290	static int ecryptfs_release(struct inode inode, struct file file)
	291	{
332ab16f	292	ecryptfs_put_lower_file(inode);
2ed92554 MH	293	kmem_cache_free(ecryptfs_file_info_cache,
	294	ecryptfs_file_to_private(file));
	295	return 0;
237fead6 MH	296	}
	297
	298	static int
02c24a82	299	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	300	{
bc5abcf7 TH	301	int rc;
	302
	303	rc = filemap_write_and_wait(file->f_mapping);
	304	if (rc)
	305	return rc;
	306
821f7494	307	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	308	}
	309
	310	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	311	{
	312	int rc = 0;
	313	struct file *lower_file = NULL;
	314
	315	lower_file = ecryptfs_file_to_lower(file);
	316	if (lower_file->f_op && lower_file->f_op->fasync)
	317	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	318	return rc;
	319	}
	320
c43f7b8f TH	321	static long
	322	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	323	{
	324	struct file *lower_file = NULL;
	325	long rc = -ENOTTY;
	326
	327	if (ecryptfs_file_to_private(file))
	328	lower_file = ecryptfs_file_to_lower(file);
	329	if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
	330	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
	331	return rc;
	332	}
	333
	334	#ifdef CONFIG_COMPAT
	335	static long
	336	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	337	{
	338	struct file *lower_file = NULL;
	339	long rc = -ENOIOCTLCMD;
	340
	341	if (ecryptfs_file_to_private(file))
	342	lower_file = ecryptfs_file_to_lower(file);
	343	if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
	344	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
	345	return rc;
	346	}
	347	#endif
237fead6 MH	348
	349	const struct file_operations ecryptfs_dir_fops = {
	350	.readdir = ecryptfs_readdir,
323ef68f	351	.read = generic_read_dir,
c43f7b8f TH	352	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	353	#ifdef CONFIG_COMPAT
	354	.compat_ioctl = ecryptfs_compat_ioctl,
	355	#endif
237fead6 MH	356	.open = ecryptfs_open,
	357	.flush = ecryptfs_flush,
	358	.release = ecryptfs_release,
	359	.fsync = ecryptfs_fsync,
	360	.fasync = ecryptfs_fasync,
e9f6a99c	361	.splice_read = generic_file_splice_read,
6038f373	362	.llseek = default_llseek,
237fead6 MH	363	};
	364
	365	const struct file_operations ecryptfs_main_fops = {
53a2731f	366	.llseek = generic_file_llseek,
237fead6 MH	367	.read = do_sync_read,
	368	.aio_read = ecryptfs_read_update_atime,
	369	.write = do_sync_write,
	370	.aio_write = generic_file_aio_write,
	371	.readdir = ecryptfs_readdir,
c43f7b8f TH	372	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	373	#ifdef CONFIG_COMPAT
	374	.compat_ioctl = ecryptfs_compat_ioctl,
	375	#endif
e5201134	376	.mmap = ecryptfs_mmap,
237fead6 MH	377	.open = ecryptfs_open,
	378	.flush = ecryptfs_flush,
	379	.release = ecryptfs_release,
	380	.fsync = ecryptfs_fsync,
	381	.fasync = ecryptfs_fasync,
e9f6a99c	382	.splice_read = generic_file_splice_read,
237fead6	383	};