[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,
				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) {
		printk(KERN_ERR "%s: Error attempting to decode and decrypt "
		       "filename [%s]; rc = [%d]\n", __func__, lower_name,
		       rc);
		goto out;
	}
	buf->caller->pos = buf->ctx.pos;
	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
	kfree(name);
	if (!rc)
		buf->entries_written++;
out:
	return rc;
}

/**
 * ecryptfs_readdir
 * @file: The eCryptfs directory file
 * @ctx: The actor to feed the entries to
 */
static int ecryptfs_readdir(struct file *file, struct dir_context *ctx)
{
	int rc;
	struct file *lower_file;
	struct inode *inode = file_inode(file);
	struct ecryptfs_getdents_callback buf = {
		.ctx.actor = ecryptfs_filldir,
		.caller = ctx,
		.sb = inode->i_sb,
	};
	lower_file = ecryptfs_file_to_lower(file);
	lower_file->f_pos = ctx->pos;
	rc = iterate_dir(lower_file, &buf.ctx);
	ctx->pos = buf.ctx.pos;
	if (rc < 0)
		goto out;
	if (buf.filldir_called && !buf.entries_written)
		goto out;
	if (rc >= 0)
		fsstack_copy_attr_atime(inode,
					file_inode(lower_file));
out:
	return rc;
}

struct kmem_cache *ecryptfs_file_info_cache;

static int read_or_initialize_metadata(struct dentry *dentry)
{
	struct inode *inode = 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;
}

/**
 * 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 "
			"[%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);
	if (d_is_dir(ecryptfs_dentry)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		mutex_lock(&crypt_stat->cs_mutex);
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		mutex_unlock(&crypt_stat->cs_mutex);
		rc = 0;
		goto out;
	}
	rc = read_or_initialize_metadata(ecryptfs_dentry);
	if (rc)
		goto out_put;
	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
			"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
			(unsigned long long)i_size_read(inode));
	goto out;
out_put:
	ecryptfs_put_lower_file(inode);
out_free:
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
out:
	return rc;
}

static int ecryptfs_flush(struct file *file, fl_owner_t td)
{
	struct file *lower_file = ecryptfs_file_to_lower(file);

	if (lower_file->f_op->flush) {
		filemap_write_and_wait(file->f_mapping);
		return lower_file->f_op->flush(lower_file, td);
	}

	return 0;
}

static int ecryptfs_release(struct inode *inode, struct file *file)
{
	ecryptfs_put_lower_file(inode);
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
	return 0;
}

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

	rc = filemap_write_and_wait(file->f_mapping);
	if (rc)
		return rc;

	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
}

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

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

static long
ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct file *lower_file = 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 FITRIM:
	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 = 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_iter = ecryptfs_read_update_atime,
	.write_iter = generic_file_write_iter,
	.iterate = ecryptfs_readdir,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.mmap = generic_file_mmap,
	.open = ecryptfs_open,
	.flush = ecryptfs_flush,
	.release = ecryptfs_release,
	.fsync = ecryptfs_fsync,
	.fasync = ecryptfs_fasync,
	.splice_read = generic_file_splice_read,
};
Commit	Line	Data
237fead6 MH	1	/**
	2	* eCryptfs: Linux filesystem encryption layer
	3	*
	4	* Copyright (C) 1997-2004 Erez Zadok
	5	* Copyright (C) 2001-2004 Stony Brook University
dd2a3b7a	6	* Copyright (C) 2004-2007 International Business Machines Corp.
237fead6 MH	7	* Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
	8	* Michael C. Thompson <mcthomps@us.ibm.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of the
	13	* License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	23	* 02111-1307, USA.
	24	*/
	25
	26	#include <linux/file.h>
	27	#include <linux/poll.h>
5a0e3ad6	28	#include <linux/slab.h>
237fead6 MH	29	#include <linux/mount.h>
	30	#include <linux/pagemap.h>
	31	#include <linux/security.h>
237fead6	32	#include <linux/compat.h>
0cc72dc7	33	#include <linux/fs_stack.h>
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);
	84	if (rc) {
	85	printk(KERN_ERR "%s: Error attempting to decode and decrypt "
	86	"filename [%s]; rc = [%d]\n", __func__, lower_name,
	87	rc);
237fead6 MH	88	goto out;
237fead6 MH	89	}
2de5f059 AV	90	buf->caller->pos = buf->ctx.pos;
2de5f059 AV	91	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
addd65ad	92	kfree(name);
2de5f059	93	if (!rc)
237fead6 MH	94	buf->entries_written++;
	95	out:
	96	return rc;
	97	}
	98
	99	/**
	100	* ecryptfs_readdir
addd65ad	101	* @file: The eCryptfs directory file
2de5f059	102	* @ctx: The actor to feed the entries to
237fead6	103	*/
2de5f059	104	static int ecryptfs_readdir(struct file file, struct dir_context ctx)
237fead6 MH	105	{
	106	int rc;
	107	struct file *lower_file;
0747fdb2	108	struct inode *inode = file_inode(file);
2de5f059 AV	109	struct ecryptfs_getdents_callback buf = {
	110	.ctx.actor = ecryptfs_filldir,
	111	.caller = ctx,
0747fdb2	112	.sb = inode->i_sb,
2de5f059	113	};
237fead6	114	lower_file = ecryptfs_file_to_lower(file);
2de5f059	115	lower_file->f_pos = ctx->pos;
5c0ba4e0	116	rc = iterate_dir(lower_file, &buf.ctx);
2de5f059	117	ctx->pos = buf.ctx.pos;
7d6c7045 MH	118	if (rc < 0)
	119	goto out;
	120	if (buf.filldir_called && !buf.entries_written)
	121	goto out;
237fead6	122	if (rc >= 0)
7d6c7045	123	fsstack_copy_attr_atime(inode,
496ad9aa	124	file_inode(lower_file));
7d6c7045	125	out:
237fead6 MH	126	return rc;
	127	}
	128
	129	struct kmem_cache *ecryptfs_file_info_cache;
	130
e3ccaa97 TH	131	static int read_or_initialize_metadata(struct dentry *dentry)
e3ccaa97 TH	132	{
2b0143b5	133	struct inode *inode = d_inode(dentry);
e3ccaa97 TH	134	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	135	struct ecryptfs_crypt_stat *crypt_stat;
	136	int rc;
	137
	138	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	139	mount_crypt_stat = &ecryptfs_superblock_to_private(
	140	inode->i_sb)->mount_crypt_stat;
	141	mutex_lock(&crypt_stat->cs_mutex);
	142
	143	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	144	crypt_stat->flags & ECRYPTFS_KEY_VALID) {
	145	rc = 0;
	146	goto out;
	147	}
	148
	149	rc = ecryptfs_read_metadata(dentry);
	150	if (!rc)
	151	goto out;
	152
	153	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
	154	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
	155	\| ECRYPTFS_ENCRYPTED);
	156	rc = 0;
	157	goto out;
	158	}
	159
	160	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	161	!i_size_read(ecryptfs_inode_to_lower(inode))) {
	162	rc = ecryptfs_initialize_file(dentry, inode);
	163	if (!rc)
	164	goto out;
	165	}
	166
	167	rc = -EIO;
	168	out:
	169	mutex_unlock(&crypt_stat->cs_mutex);
	170	return rc;
	171	}
	172
237fead6 MH	173	/**
	174	* ecryptfs_open
	175	* @inode: inode speciying file to open
	176	* @file: Structure to return filled in
	177	*
	178	* Opens the file specified by inode.
	179	*
	180	* Returns zero on success; non-zero otherwise
	181	*/
	182	static int ecryptfs_open(struct inode inode, struct file file)
	183	{
	184	int rc = 0;
	185	struct ecryptfs_crypt_stat *crypt_stat = NULL;
bd243a4b	186	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	187	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	188	* ecryptfs_lookup() */
237fead6	189	struct ecryptfs_file_info *file_info;
237fead6 MH	190
237fead6 MH	191	/* Released in ecryptfs_release or end of function if failure */
c3762229	192	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	193	ecryptfs_set_file_private(file, file_info);
	194	if (!file_info) {
	195	ecryptfs_printk(KERN_ERR,
	196	"Error attempting to allocate memory\n");
	197	rc = -ENOMEM;
	198	goto out;
	199	}
237fead6	200	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	201	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	202	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	203	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	204	/* Policy code enabled in future release */
2ed92554 MH	205	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	206	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	207	}
237fead6 MH	208	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	209	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	210	if (rc) {
27992890 RS	211	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	212	"the lower file for the dentry with name "
9e78d14a DH	213	"[%pd]; rc = [%d]\n", __func__,
9e78d14a DH	214	ecryptfs_dentry, rc);
27992890	215	goto out_free;
72b55fff	216	}
0abe1169 RS	217	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	218	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	219	rc = -EPERM;
332ab16f	220	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	221	"file must hence be opened RO\n", __func__);
332ab16f	222	goto out_put;
e27759d7	223	}
2ed92554 MH	224	ecryptfs_set_file_lower(
2ed92554 MH	225	file, ecryptfs_inode_to_private(inode)->lower_file);
e36cb0b8	226	if (d_is_dir(ecryptfs_dentry)) {
237fead6	227	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	228	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	229	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	230	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	231	rc = 0;
	232	goto out;
	233	}
e3ccaa97 TH	234	rc = read_or_initialize_metadata(ecryptfs_dentry);
	235	if (rc)
	236	goto out_put;
888d57bb JP	237	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	238	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	239	(unsigned long long)i_size_read(inode));
237fead6	240	goto out;
332ab16f TH	241	out_put:
332ab16f TH	242	ecryptfs_put_lower_file(inode);
2ed92554	243	out_free:
237fead6 MH	244	kmem_cache_free(ecryptfs_file_info_cache,
	245	ecryptfs_file_to_private(file));
	246	out:
	247	return rc;
	248	}
	249
	250	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	251	{
64e6651d TH	252	struct file *lower_file = ecryptfs_file_to_lower(file);
64e6651d TH	253
72c2d531	254	if (lower_file->f_op->flush) {
64e6651d TH	255	filemap_write_and_wait(file->f_mapping);
	256	return lower_file->f_op->flush(lower_file, td);
	257	}
	258
	259	return 0;
237fead6 MH	260	}
	261
	262	static int ecryptfs_release(struct inode inode, struct file file)
	263	{
332ab16f	264	ecryptfs_put_lower_file(inode);
2ed92554 MH	265	kmem_cache_free(ecryptfs_file_info_cache,
	266	ecryptfs_file_to_private(file));
	267	return 0;
237fead6 MH	268	}
	269
	270	static int
02c24a82	271	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	272	{
bc5abcf7 TH	273	int rc;
	274
	275	rc = filemap_write_and_wait(file->f_mapping);
	276	if (rc)
	277	return rc;
	278
821f7494	279	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	280	}
	281
	282	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	283	{
	284	int rc = 0;
	285	struct file *lower_file = NULL;
	286
	287	lower_file = ecryptfs_file_to_lower(file);
72c2d531	288	if (lower_file->f_op->fasync)
237fead6 MH	289	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	290	return rc;
	291	}
	292
c43f7b8f TH	293	static long
	294	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	295	{
2000f5be	296	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	297	long rc = -ENOTTY;
c43f7b8f TH	298
6d65261a TH	299	if (!lower_file->f_op->unlocked_ioctl)
	300	return rc;
	301
	302	switch (cmd) {
	303	case FITRIM:
	304	case FS_IOC_GETFLAGS:
	305	case FS_IOC_SETFLAGS:
	306	case FS_IOC_GETVERSION:
	307	case FS_IOC_SETVERSION:
c43f7b8f	308	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
6d65261a TH	309	fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
	310
	311	return rc;
	312	default:
	313	return rc;
	314	}
c43f7b8f TH	315	}
	316
	317	#ifdef CONFIG_COMPAT
	318	static long
	319	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	320	{
2000f5be	321	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	322	long rc = -ENOIOCTLCMD;
c43f7b8f TH	323
6d65261a TH	324	if (!lower_file->f_op->compat_ioctl)
	325	return rc;
	326
	327	switch (cmd) {
	328	case FITRIM:
	329	case FS_IOC32_GETFLAGS:
	330	case FS_IOC32_SETFLAGS:
	331	case FS_IOC32_GETVERSION:
	332	case FS_IOC32_SETVERSION:
c43f7b8f	333	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
6d65261a TH	334	fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
	335
	336	return rc;
	337	default:
	338	return rc;
	339	}
c43f7b8f TH	340	}
c43f7b8f TH	341	#endif
237fead6 MH	342
237fead6 MH	343	const struct file_operations ecryptfs_dir_fops = {
2de5f059	344	.iterate = ecryptfs_readdir,
323ef68f	345	.read = generic_read_dir,
c43f7b8f TH	346	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	347	#ifdef CONFIG_COMPAT
	348	.compat_ioctl = ecryptfs_compat_ioctl,
	349	#endif
237fead6 MH	350	.open = ecryptfs_open,
	351	.flush = ecryptfs_flush,
	352	.release = ecryptfs_release,
	353	.fsync = ecryptfs_fsync,
	354	.fasync = ecryptfs_fasync,
e9f6a99c	355	.splice_read = generic_file_splice_read,
6038f373	356	.llseek = default_llseek,
237fead6 MH	357	};
	358
	359	const struct file_operations ecryptfs_main_fops = {
53a2731f	360	.llseek = generic_file_llseek,
02797829	361	.read_iter = ecryptfs_read_update_atime,
8174202b	362	.write_iter = generic_file_write_iter,
2de5f059	363	.iterate = ecryptfs_readdir,
c43f7b8f TH	364	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	365	#ifdef CONFIG_COMPAT
	366	.compat_ioctl = ecryptfs_compat_ioctl,
	367	#endif
821f7494	368	.mmap = generic_file_mmap,
237fead6 MH	369	.open = ecryptfs_open,
	370	.flush = ecryptfs_flush,
	371	.release = ecryptfs_release,
	372	.fsync = ecryptfs_fsync,
	373	.fasync = ecryptfs_fasync,
e9f6a99c	374	.splice_read = generic_file_splice_read,
237fead6	375	};