[linux-2.6-block.git] / fs / ecryptfs / file.c

// SPDX-License-Identifier: GPL-2.0-or-later
/**
 * 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>
 */

#include <linux/file.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/fs_stack.h>
#include "ecryptfs_kernel.h"

/**
 * ecryptfs_read_update_atime
 *
 * generic_file_read updates the atime of upper layer inode.  But, it
 * doesn't give us a chance to update the atime of the lower layer
 * inode.  This function is a wrapper to generic_file_read.  It
 * updates the atime of the lower level inode if generic_file_read
 * returns without any errors. This is to be used only for file reads.
 * The function to be used for directory reads is ecryptfs_read.
 */
static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
				struct iov_iter *to)
{
	ssize_t rc;
	struct path *path;
	struct file *file = iocb->ki_filp;

	rc = generic_file_read_iter(iocb, to);
	if (rc >= 0) {
		path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
		touch_atime(path);
	}
	return rc;
}

struct ecryptfs_getdents_callback {
	struct dir_context ctx;
	struct dir_context *caller;
	struct super_block *sb;
	int filldir_called;
	int entries_written;
};

/* Inspired by generic filldir in fs/readdir.c */
static int
ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
		 int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
{
	struct ecryptfs_getdents_callback *buf =
		container_of(ctx, struct ecryptfs_getdents_callback, ctx);
	size_t name_size;
	char *name;
	int rc;

	buf->filldir_called++;
	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
						  buf->sb, lower_name,
						  lower_namelen);
	if (rc) {
		if (rc != -EINVAL) {
			ecryptfs_printk(KERN_DEBUG,
					"%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
					__func__, lower_name, rc);
			return rc;
		}

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

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

	return rc;
}

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

struct kmem_cache *ecryptfs_file_info_cache;

static int read_or_initialize_metadata(struct dentry *dentry)
{
	struct inode *inode = d_inode(dentry);
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct ecryptfs_crypt_stat *crypt_stat;
	int rc;

	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mount_crypt_stat = &ecryptfs_superblock_to_private(
						inode->i_sb)->mount_crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);

	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	    crypt_stat->flags & ECRYPTFS_KEY_VALID) {
		rc = 0;
		goto out;
	}

	rc = ecryptfs_read_metadata(dentry);
	if (!rc)
		goto out;

	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
		crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
				       | ECRYPTFS_ENCRYPTED);
		rc = 0;
		goto out;
	}

	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	    !i_size_read(ecryptfs_inode_to_lower(inode))) {
		rc = ecryptfs_initialize_file(dentry, inode);
		if (!rc)
			goto out;
	}

	rc = -EIO;
out:
	mutex_unlock(&crypt_stat->cs_mutex);
	return rc;
}

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

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

	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the lower file for the dentry with name "
			"[%pd]; rc = [%d]\n", __func__,
			ecryptfs_dentry, rc);
		goto out_free;
	}
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
	    == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out_put;
	}
	ecryptfs_set_file_lower(
		file, ecryptfs_inode_to_private(inode)->lower_file);
	rc = read_or_initialize_metadata(ecryptfs_dentry);
	if (rc)
		goto out_put;
	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
			"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
			(unsigned long long)i_size_read(inode));
	goto out;
out_put:
	ecryptfs_put_lower_file(inode);
out_free:
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
out:
	return rc;
}

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

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

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

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

	return 0;
}

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

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

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

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

	rc = file_write_and_wait(file);
	if (rc)
		return rc;

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

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

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

static long
ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct file *lower_file = ecryptfs_file_to_lower(file);
	long rc = -ENOTTY;

	if (!lower_file->f_op->unlocked_ioctl)
		return rc;

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

		return rc;
	default:
		return rc;
	}
}

#ifdef CONFIG_COMPAT
static long
ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct file *lower_file = ecryptfs_file_to_lower(file);
	long rc = -ENOIOCTLCMD;

	if (!lower_file->f_op->compat_ioctl)
		return rc;

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

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

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

const struct file_operations ecryptfs_main_fops = {
	.llseek = generic_file_llseek,
	.read_iter = ecryptfs_read_update_atime,
	.write_iter = generic_file_write_iter,
	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = ecryptfs_compat_ioctl,
#endif
	.mmap = ecryptfs_mmap,
	.open = ecryptfs_open,
	.flush = ecryptfs_flush,
	.release = ecryptfs_release,
	.fsync = ecryptfs_fsync,
	.fasync = ecryptfs_fasync,
	.splice_read = generic_file_splice_read,
};
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
237fead6 MH	2	/**
	3	* eCryptfs: Linux filesystem encryption layer
	4	*
	5	* Copyright (C) 1997-2004 Erez Zadok
	6	* Copyright (C) 2001-2004 Stony Brook University
dd2a3b7a	7	* Copyright (C) 2004-2007 International Business Machines Corp.
237fead6 MH	8	* Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
237fead6 MH	9	* Michael C. Thompson <mcthomps@us.ibm.com>
237fead6 MH	10	*/
	11
	12	#include <linux/file.h>
	13	#include <linux/poll.h>
5a0e3ad6	14	#include <linux/slab.h>
237fead6 MH	15	#include <linux/mount.h>
	16	#include <linux/pagemap.h>
	17	#include <linux/security.h>
237fead6	18	#include <linux/compat.h>
0cc72dc7	19	#include <linux/fs_stack.h>
237fead6 MH	20	#include "ecryptfs_kernel.h"
237fead6 MH	21
237fead6 MH	22	/**
	23	* ecryptfs_read_update_atime
	24	*
	25	* generic_file_read updates the atime of upper layer inode. But, it
	26	* doesn't give us a chance to update the atime of the lower layer
	27	* inode. This function is a wrapper to generic_file_read. It
	28	* updates the atime of the lower level inode if generic_file_read
	29	* returns without any errors. This is to be used only for file reads.
	30	* The function to be used for directory reads is ecryptfs_read.
	31	*/
	32	static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
02797829	33	struct iov_iter *to)
237fead6	34	{
38a708d7	35	ssize_t rc;
cc18ec3c	36	struct path *path;
237fead6 MH	37	struct file *file = iocb->ki_filp;
237fead6 MH	38
02797829	39	rc = generic_file_read_iter(iocb, to);
237fead6	40	if (rc >= 0) {
cc18ec3c MW	41	path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
cc18ec3c MW	42	touch_atime(path);
237fead6 MH	43	}
	44	return rc;
	45	}
	46
	47	struct ecryptfs_getdents_callback {
5c0ba4e0	48	struct dir_context ctx;
2de5f059	49	struct dir_context *caller;
0747fdb2	50	struct super_block *sb;
237fead6 MH	51	int filldir_called;
	52	int entries_written;
	53	};
	54
7d6c7045	55	/* Inspired by generic filldir in fs/readdir.c */
237fead6	56	static int
ac7576f4 MS	57	ecryptfs_filldir(struct dir_context ctx, const char lower_name,
ac7576f4 MS	58	int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
237fead6	59	{
237fead6	60	struct ecryptfs_getdents_callback *buf =
ac7576f4	61	container_of(ctx, struct ecryptfs_getdents_callback, ctx);
a8f12864	62	size_t name_size;
addd65ad	63	char *name;
237fead6	64	int rc;
237fead6	65
237fead6	66	buf->filldir_called++;
addd65ad	67	rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
0747fdb2	68	buf->sb, lower_name,
addd65ad MH	69	lower_namelen);
addd65ad MH	70	if (rc) {
e86281e7 TH	71	if (rc != -EINVAL) {
	72	ecryptfs_printk(KERN_DEBUG,
	73	"%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
	74	__func__, lower_name, rc);
	75	return rc;
	76	}
	77
	78	/* Mask -EINVAL errors as these are most likely due a plaintext
	79	* filename present in the lower filesystem despite filename
	80	* encryption being enabled. One unavoidable example would be
	81	* the "lost+found" dentry in the root directory of an Ext4
	82	* filesystem.
	83	*/
	84	return 0;
237fead6	85	}
e86281e7	86
2de5f059 AV	87	buf->caller->pos = buf->ctx.pos;
2de5f059 AV	88	rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
addd65ad	89	kfree(name);
2de5f059	90	if (!rc)
237fead6	91	buf->entries_written++;
e86281e7	92
237fead6 MH	93	return rc;
	94	}
	95
	96	/**
	97	* ecryptfs_readdir
addd65ad	98	* @file: The eCryptfs directory file
2de5f059	99	* @ctx: The actor to feed the entries to
237fead6	100	*/
2de5f059	101	static int ecryptfs_readdir(struct file file, struct dir_context ctx)
237fead6 MH	102	{
	103	int rc;
	104	struct file *lower_file;
0747fdb2	105	struct inode *inode = file_inode(file);
2de5f059 AV	106	struct ecryptfs_getdents_callback buf = {
	107	.ctx.actor = ecryptfs_filldir,
	108	.caller = ctx,
0747fdb2	109	.sb = inode->i_sb,
2de5f059	110	};
237fead6	111	lower_file = ecryptfs_file_to_lower(file);
5c0ba4e0	112	rc = iterate_dir(lower_file, &buf.ctx);
2de5f059	113	ctx->pos = buf.ctx.pos;
7d6c7045 MH	114	if (rc < 0)
	115	goto out;
	116	if (buf.filldir_called && !buf.entries_written)
	117	goto out;
237fead6	118	if (rc >= 0)
7d6c7045	119	fsstack_copy_attr_atime(inode,
496ad9aa	120	file_inode(lower_file));
7d6c7045	121	out:
237fead6 MH	122	return rc;
	123	}
	124
	125	struct kmem_cache *ecryptfs_file_info_cache;
	126
e3ccaa97 TH	127	static int read_or_initialize_metadata(struct dentry *dentry)
e3ccaa97 TH	128	{
2b0143b5	129	struct inode *inode = d_inode(dentry);
e3ccaa97 TH	130	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	131	struct ecryptfs_crypt_stat *crypt_stat;
	132	int rc;
	133
	134	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	135	mount_crypt_stat = &ecryptfs_superblock_to_private(
	136	inode->i_sb)->mount_crypt_stat;
	137	mutex_lock(&crypt_stat->cs_mutex);
	138
	139	if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
	140	crypt_stat->flags & ECRYPTFS_KEY_VALID) {
	141	rc = 0;
	142	goto out;
	143	}
	144
	145	rc = ecryptfs_read_metadata(dentry);
	146	if (!rc)
	147	goto out;
	148
	149	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
	150	crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
	151	\| ECRYPTFS_ENCRYPTED);
	152	rc = 0;
	153	goto out;
	154	}
	155
	156	if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
	157	!i_size_read(ecryptfs_inode_to_lower(inode))) {
	158	rc = ecryptfs_initialize_file(dentry, inode);
	159	if (!rc)
	160	goto out;
	161	}
	162
	163	rc = -EIO;
	164	out:
	165	mutex_unlock(&crypt_stat->cs_mutex);
	166	return rc;
	167	}
	168
f0fe970d JM	169	static int ecryptfs_mmap(struct file file, struct vm_area_struct vma)
	170	{
	171	struct file *lower_file = ecryptfs_file_to_lower(file);
	172	/*
	173	* Don't allow mmap on top of file systems that don't support it
	174	* natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
	175	* allows recursive mounting, this will need to be extended.
	176	*/
	177	if (!lower_file->f_op->mmap)
	178	return -ENODEV;
	179	return generic_file_mmap(file, vma);
	180	}
	181
237fead6 MH	182	/**
237fead6 MH	183	* ecryptfs_open
40f0fd37	184	* @inode: inode specifying file to open
237fead6 MH	185	* @file: Structure to return filled in
	186	*
	187	* Opens the file specified by inode.
	188	*
	189	* Returns zero on success; non-zero otherwise
	190	*/
	191	static int ecryptfs_open(struct inode inode, struct file file)
	192	{
	193	int rc = 0;
	194	struct ecryptfs_crypt_stat *crypt_stat = NULL;
bd243a4b	195	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	196	/* Private value of ecryptfs_dentry allocated in
237fead6 MH	197	* ecryptfs_lookup() */
237fead6	198	struct ecryptfs_file_info *file_info;
237fead6 MH	199
237fead6 MH	200	/* Released in ecryptfs_release or end of function if failure */
c3762229	201	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	202	ecryptfs_set_file_private(file, file_info);
	203	if (!file_info) {
	204	ecryptfs_printk(KERN_ERR,
	205	"Error attempting to allocate memory\n");
	206	rc = -ENOMEM;
	207	goto out;
	208	}
237fead6	209	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	210	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	211	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	212	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	213	/* Policy code enabled in future release */
2ed92554 MH	214	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	215	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	216	}
237fead6 MH	217	mutex_unlock(&crypt_stat->cs_mutex);
3b06b3eb	218	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
27992890 RS	219	if (rc) {
27992890 RS	220	printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f	221	"the lower file for the dentry with name "
9e78d14a DH	222	"[%pd]; rc = [%d]\n", __func__,
9e78d14a DH	223	ecryptfs_dentry, rc);
27992890	224	goto out_free;
72b55fff	225	}
0abe1169 RS	226	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
0abe1169 RS	227	== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
e27759d7	228	rc = -EPERM;
332ab16f	229	printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
e27759d7	230	"file must hence be opened RO\n", __func__);
332ab16f	231	goto out_put;
e27759d7	232	}
2ed92554 MH	233	ecryptfs_set_file_lower(
2ed92554 MH	234	file, ecryptfs_inode_to_private(inode)->lower_file);
e3ccaa97 TH	235	rc = read_or_initialize_metadata(ecryptfs_dentry);
	236	if (rc)
	237	goto out_put;
888d57bb JP	238	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
	239	"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
	240	(unsigned long long)i_size_read(inode));
237fead6	241	goto out;
332ab16f TH	242	out_put:
332ab16f TH	243	ecryptfs_put_lower_file(inode);
2ed92554	244	out_free:
237fead6 MH	245	kmem_cache_free(ecryptfs_file_info_cache,
	246	ecryptfs_file_to_private(file));
	247	out:
	248	return rc;
	249	}
	250
6a480a78 AV	251	/**
6a480a78 AV	252	* ecryptfs_dir_open
40f0fd37	253	* @inode: inode specifying file to open
6a480a78 AV	254	* @file: Structure to return filled in
	255	*
	256	* Opens the file specified by inode.
	257	*
	258	* Returns zero on success; non-zero otherwise
	259	*/
	260	static int ecryptfs_dir_open(struct inode inode, struct file file)
	261	{
	262	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	263	/* Private value of ecryptfs_dentry allocated in
	264	* ecryptfs_lookup() */
	265	struct ecryptfs_file_info *file_info;
	266	struct file *lower_file;
	267
	268	/* Released in ecryptfs_release or end of function if failure */
	269	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	270	ecryptfs_set_file_private(file, file_info);
	271	if (unlikely(!file_info)) {
	272	ecryptfs_printk(KERN_ERR,
	273	"Error attempting to allocate memory\n");
	274	return -ENOMEM;
	275	}
	276	lower_file = dentry_open(ecryptfs_dentry_to_lower_path(ecryptfs_dentry),
	277	file->f_flags, current_cred());
	278	if (IS_ERR(lower_file)) {
	279	printk(KERN_ERR "%s: Error attempting to initialize "
	280	"the lower file for the dentry with name "
	281	"[%pd]; rc = [%ld]\n", __func__,
	282	ecryptfs_dentry, PTR_ERR(lower_file));
	283	kmem_cache_free(ecryptfs_file_info_cache, file_info);
	284	return PTR_ERR(lower_file);
	285	}
	286	ecryptfs_set_file_lower(file, lower_file);
	287	return 0;
	288	}
	289
237fead6 MH	290	static int ecryptfs_flush(struct file *file, fl_owner_t td)
237fead6 MH	291	{
64e6651d TH	292	struct file *lower_file = ecryptfs_file_to_lower(file);
64e6651d TH	293
72c2d531	294	if (lower_file->f_op->flush) {
64e6651d TH	295	filemap_write_and_wait(file->f_mapping);
	296	return lower_file->f_op->flush(lower_file, td);
	297	}
	298
	299	return 0;
237fead6 MH	300	}
	301
	302	static int ecryptfs_release(struct inode inode, struct file file)
	303	{
332ab16f	304	ecryptfs_put_lower_file(inode);
2ed92554 MH	305	kmem_cache_free(ecryptfs_file_info_cache,
	306	ecryptfs_file_to_private(file));
	307	return 0;
237fead6 MH	308	}
237fead6 MH	309
6a480a78 AV	310	static int ecryptfs_dir_release(struct inode inode, struct file file)
	311	{
	312	fput(ecryptfs_file_to_lower(file));
	313	kmem_cache_free(ecryptfs_file_info_cache,
	314	ecryptfs_file_to_private(file));
	315	return 0;
	316	}
	317
	318	static loff_t ecryptfs_dir_llseek(struct file *file, loff_t offset, int whence)
	319	{
	320	return vfs_llseek(ecryptfs_file_to_lower(file), offset, whence);
	321	}
	322
237fead6	323	static int
02c24a82	324	ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
237fead6	325	{
bc5abcf7 TH	326	int rc;
bc5abcf7 TH	327
6d4b5124	328	rc = file_write_and_wait(file);
bc5abcf7 TH	329	if (rc)
	330	return rc;
	331
821f7494	332	return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
237fead6 MH	333	}
	334
	335	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	336	{
	337	int rc = 0;
	338	struct file *lower_file = NULL;
	339
	340	lower_file = ecryptfs_file_to_lower(file);
72c2d531	341	if (lower_file->f_op->fasync)
237fead6 MH	342	rc = lower_file->f_op->fasync(fd, lower_file, flag);
	343	return rc;
	344	}
	345
c43f7b8f TH	346	static long
	347	ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	348	{
2000f5be	349	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	350	long rc = -ENOTTY;
c43f7b8f TH	351
6d65261a TH	352	if (!lower_file->f_op->unlocked_ioctl)
	353	return rc;
	354
	355	switch (cmd) {
	356	case FITRIM:
	357	case FS_IOC_GETFLAGS:
	358	case FS_IOC_SETFLAGS:
	359	case FS_IOC_GETVERSION:
	360	case FS_IOC_SETVERSION:
c43f7b8f	361	rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
6d65261a TH	362	fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
	363
	364	return rc;
	365	default:
	366	return rc;
	367	}
c43f7b8f TH	368	}
	369
	370	#ifdef CONFIG_COMPAT
	371	static long
	372	ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	373	{
2000f5be	374	struct file *lower_file = ecryptfs_file_to_lower(file);
c43f7b8f TH	375	long rc = -ENOIOCTLCMD;
c43f7b8f TH	376
6d65261a TH	377	if (!lower_file->f_op->compat_ioctl)
	378	return rc;
	379
	380	switch (cmd) {
6d65261a TH	381	case FS_IOC32_GETFLAGS:
	382	case FS_IOC32_SETFLAGS:
	383	case FS_IOC32_GETVERSION:
	384	case FS_IOC32_SETVERSION:
c43f7b8f	385	rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
6d65261a TH	386	fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
	387
	388	return rc;
	389	default:
	390	return rc;
	391	}
c43f7b8f TH	392	}
c43f7b8f TH	393	#endif
237fead6 MH	394
237fead6 MH	395	const struct file_operations ecryptfs_dir_fops = {
51a16a9c	396	.iterate_shared = ecryptfs_readdir,
323ef68f	397	.read = generic_read_dir,
c43f7b8f TH	398	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	399	#ifdef CONFIG_COMPAT
	400	.compat_ioctl = ecryptfs_compat_ioctl,
	401	#endif
6a480a78 AV	402	.open = ecryptfs_dir_open,
6a480a78 AV	403	.release = ecryptfs_dir_release,
237fead6	404	.fsync = ecryptfs_fsync,
6a480a78	405	.llseek = ecryptfs_dir_llseek,
237fead6 MH	406	};
	407
	408	const struct file_operations ecryptfs_main_fops = {
53a2731f	409	.llseek = generic_file_llseek,
02797829	410	.read_iter = ecryptfs_read_update_atime,
8174202b	411	.write_iter = generic_file_write_iter,
c43f7b8f TH	412	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
	413	#ifdef CONFIG_COMPAT
	414	.compat_ioctl = ecryptfs_compat_ioctl,
	415	#endif
f0fe970d	416	.mmap = ecryptfs_mmap,
237fead6 MH	417	.open = ecryptfs_open,
	418	.flush = ecryptfs_flush,
	419	.release = ecryptfs_release,
	420	.fsync = ecryptfs_fsync,
	421	.fasync = ecryptfs_fasync,
e9f6a99c	422	.splice_read = generic_file_splice_read,
237fead6	423	};