C++ ecryptfs_get_lower_file函数代码示例

static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
{
	struct ecryptfs_crypt_stat *crypt_stat;
	int rc;

	rc = ecryptfs_get_lower_file(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__,
			dentry->d_name.name, rc);
		return rc;
	}

	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	/* TODO: lock for crypt_stat comparison */
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
		ecryptfs_set_default_sizes(crypt_stat);

	rc = ecryptfs_read_and_validate_header_region(inode);
	ecryptfs_put_lower_file(inode);
	if (rc) {
		rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
		if (!rc)
			crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
	}

	/* Must return 0 to allow non-eCryptfs files to be looked up, too */
	return 0;
}

/**
 * ecryptfs_initialize_file
 *
 * Cause the file to be changed from a basic empty file to an ecryptfs
 * file with a header and first data page.
 *
 * Returns zero on success
 */
int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
			     struct inode *ecryptfs_inode)
{
	struct ecryptfs_crypt_stat *crypt_stat =
		&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
#ifdef FEATURE_SDCARD_ENCRYPTION
	struct ecryptfs_mount_sd_crypt_stat *mount_sd_crypt_stat =
		&ecryptfs_superblock_to_private(
			ecryptfs_dentry->d_sb)->mount_sd_crypt_stat;
	char dentry_name[MAX_FILE_NAME_LENGTH] = {0,};
#endif
	int rc = 0;

	if (S_ISDIR(ecryptfs_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		goto out;
	}
#ifdef FEATURE_SDCARD_ENCRYPTION
	memcpy(dentry_name, ecryptfs_dentry->d_name.name, ecryptfs_dentry->d_name.len);
	if (mount_sd_crypt_stat && (mount_sd_crypt_stat->flags
						& ECRYPTFS_MEDIA_EXCEPTION)) {
		if(ecryptfs_media_file_search(dentry_name)){
			crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
			goto out;
		}
	}

    if(ecryptfs_asec_file_search(dentry_name)){
        crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
        goto out;
    }
	if (mount_sd_crypt_stat && (mount_sd_crypt_stat->flags
			& ECRYPTFS_DECRYPTION_ONLY)) {
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		goto out;
	}
#endif
	ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
	rc = ecryptfs_new_file_context(ecryptfs_inode);
	if (rc) {
		ecryptfs_printk(KERN_ERR, "Error creating new file "
				"context; rc = [%d]\n", rc);
		goto out;
	}
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_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;
	}
	rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
	if (rc)
		printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
	ecryptfs_put_lower_file(ecryptfs_inode);
out:
	return rc;
}

static int ecryptfs_update_crypt_flag(struct dentry *dentry, int is_sensitive)
{
	int rc = 0;
	struct inode *inode;
	struct inode *lower_inode;
	struct ecryptfs_crypt_stat *crypt_stat;
	u32 tmp_flags;

	crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
	if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
		ecryptfs_init_crypt_stat(crypt_stat);
	inode = dentry->d_inode;
	lower_inode = ecryptfs_inode_to_lower(inode);

	mutex_lock(&crypt_stat->cs_mutex);
	rc = ecryptfs_get_lower_file(dentry, inode);
	if (rc) {
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("ecryptfs_get_lower_file rc=%d\n", rc);
		goto out;
	}

	tmp_flags = crypt_stat->flags;
	if (is_sensitive) {
		crypt_stat->flags |= ECRYPTFS_DEK_IS_SENSITIVE;
		/*
		* Set sensirive for all the pages in the inode 
		*/
		set_sensitive_mapping_pages(inode->i_mapping, 0, -1);
	}
	else{
		crypt_stat->flags &= ~ECRYPTFS_DEK_IS_SENSITIVE;
	}

	rc = ecryptfs_write_metadata(dentry, inode);
	if (rc) {
		crypt_stat->flags = tmp_flags;
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("ecryptfs_write_metadata rc=%d\n", rc);
		goto out;
	}

	rc = ecryptfs_write_inode_size_to_metadata(inode);
	if (rc) {
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("Problem with "
				"ecryptfs_write_inode_size_to_metadata; "
				"rc = [%d]\n", rc);
		goto out;
	}

	ecryptfs_put_lower_file(inode);
	mutex_unlock(&crypt_stat->cs_mutex);
out:
	fsstack_copy_attr_all(inode, lower_inode);
	return rc;
}

/**
 * ecryptfs_initialize_file
 *
 * Cause the file to be changed from a basic empty file to an ecryptfs
 * file with a header and first data page.
 *
 * Returns zero on success
 */
int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
			     struct inode *ecryptfs_inode)
{
	struct ecryptfs_crypt_stat *crypt_stat =
		&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
#if 1 // FEATURE_SDCARD_ENCRYPTION
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
		&ecryptfs_superblock_to_private(
			ecryptfs_dentry->d_sb)->mount_crypt_stat;
#endif
	int rc = 0;

	if (S_ISDIR(ecryptfs_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		goto out;
	}
#if defined (FEATURE_SDCARD_MEDIAEXN_SYSTEMCALL_ENCRYPTION)
	if (getMediaProperty() == 1){
		if(ecryptfs_mediaFileSearch(ecryptfs_dentry->d_name.name)){
			crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
			goto out;
		}
	}
#endif //FEATURE_SDCARD_MEDIAEXN_SYSTEMCALL_ENCRYPTION
#if 1 // FEATURE_SDCARD_ENCRYPTION
	if (mount_crypt_stat && (mount_crypt_stat->flags
			& ECRYPTFS_DECRYPTION_ONLY)) {
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		goto out;
	}
#endif
	ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
	rc = ecryptfs_new_file_context(ecryptfs_inode);
	if (rc) {
		ecryptfs_printk(KERN_ERR, "Error creating new file "
				"context; rc = [%d]\n", rc);
		goto out;
	}
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_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;
	}
	rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
	if (rc)
		printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
	ecryptfs_put_lower_file(ecryptfs_inode);
out:
	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 "
			"[%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;
}

//.........这里部分代码省略.........
	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 "
			"[%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;
}

/**
 * ecryptfs_initialize_file
 *
 * Cause the file to be changed from a basic empty file to an ecryptfs
 * file with a header and first data page.
 *
 * Returns zero on success
 */
static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
{
	struct ecryptfs_crypt_stat *crypt_stat =
		&ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
	int rc = 0;

	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		goto out;
	}
	ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
	rc = ecryptfs_new_file_context(ecryptfs_dentry);
	if (rc) {
		ecryptfs_printk(KERN_ERR, "Error creating new file "
				"context; rc = [%d]\n", rc);
		goto out;
	}
	rc = ecryptfs_get_lower_file(ecryptfs_dentry,
				     ecryptfs_dentry->d_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;
	}
#ifdef CONFIG_WTL_ENCRYPTION_FILTER
	mutex_lock(&crypt_stat->cs_mutex);
	if (crypt_stat->flags & ECRYPTFS_ENCRYPTED) {
		struct dentry *fp_dentry =
			ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)
			->lower_file->f_dentry;
		struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
			&ecryptfs_superblock_to_private(ecryptfs_dentry->d_sb)
			->mount_crypt_stat;
		char filename[256];
		strcpy(filename, fp_dentry->d_name.name);
		if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_NEW_PASSTHROUGH)
		    || ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING) &&
			(is_file_name_match(mount_crypt_stat, fp_dentry) ||
			is_file_ext_match(mount_crypt_stat, filename)))) {
			crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
					| ECRYPTFS_ENCRYPTED);
			ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
		} else {
			rc = ecryptfs_write_metadata(ecryptfs_dentry);
			if (rc)
				printk(
				KERN_ERR "Error writing headers; rc = [%d]\n"
				    , rc);
			ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
		}
	}
	mutex_unlock(&crypt_stat->cs_mutex);
#else
	rc = ecryptfs_write_metadata(ecryptfs_dentry);
	if (rc)
		printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
	ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
#endif
out:
	return rc;
}

/**
 * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 */
int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
					struct dentry *lower_dentry,
					struct inode *ecryptfs_dir_inode)
{
	struct dentry *lower_dir_dentry;
	struct vfsmount *lower_mnt;
	struct inode *lower_inode;
	struct ecryptfs_crypt_stat *crypt_stat;
	char *page_virt = NULL;
	int put_lower = 0, rc = 0;

	lower_dir_dentry = lower_dentry->d_parent;
	lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
				   ecryptfs_dentry->d_parent));
	lower_inode = lower_dentry->d_inode;
	fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
	BUG_ON(!lower_dentry->d_count);
	ecryptfs_set_dentry_private(ecryptfs_dentry,
				    kmem_cache_alloc(ecryptfs_dentry_info_cache,
						     GFP_KERNEL));
	if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
		rc = -ENOMEM;
		printk(KERN_ERR "%s: Out of memory whilst attempting "
		       "to allocate ecryptfs_dentry_info struct\n",
			__func__);
		goto out_put;
	}
	ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
	ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
	if (!lower_dentry->d_inode) {
		/* We want to add because we couldn't find in lower */
		d_add(ecryptfs_dentry, NULL);
		goto out;
	}
	rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
				ecryptfs_dir_inode->i_sb,
				ECRYPTFS_INTERPOSE_FLAG_D_ADD);
	if (rc) {
		printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
		       __func__, rc);
		goto out;
	}
	if (S_ISDIR(lower_inode->i_mode))
		goto out;
	if (S_ISLNK(lower_inode->i_mode))
		goto out;
	if (special_file(lower_inode->i_mode))
		goto out;
	/* Released in this function */
	page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
	if (!page_virt) {
		printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
		       __func__);
		rc = -ENOMEM;
		goto out;
	}
	rc = ecryptfs_get_lower_file(ecryptfs_dentry);
	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_kmem;
	}
	put_lower = 1;
	crypt_stat = &ecryptfs_inode_to_private(
					ecryptfs_dentry->d_inode)->crypt_stat;
	/* TODO: lock for crypt_stat comparison */
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
			ecryptfs_set_default_sizes(crypt_stat);
	rc = ecryptfs_read_and_validate_header_region(page_virt,
						      ecryptfs_dentry->d_inode);
	if (rc) {
		memset(page_virt, 0, PAGE_CACHE_SIZE);
		rc = ecryptfs_read_and_validate_xattr_region(page_virt,
							     ecryptfs_dentry);
		if (rc) {
			rc = 0;
			goto out_free_kmem;
		}
		crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
	}
	ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
out_free_kmem:
	kmem_cache_free(ecryptfs_header_cache_2, page_virt);
	goto out;
out_put:
	dput(lower_dentry);
	mntput(lower_mnt);
	d_drop(ecryptfs_dentry);
out:
	if (put_lower)
		ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
	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 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 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;
	}
	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)) {
#ifdef CONFIG_SDP
		/*
		 * it's possible to have a sensitive directory. (vault)
		 */
		if (mount_crypt_stat->flags & ECRYPTFS_MOUNT_SDP_ENABLED)
			crypt_stat->flags |= ECRYPTFS_DEK_SDP_ENABLED;
#endif
		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;
#ifdef CONFIG_SDP
	if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
		if (ecryptfs_is_persona_locked(crypt_stat->userid)) {
			ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc);
#if 0
			if (file->f_flags & O_SDP) {
				ecryptfs_printk(KERN_INFO, "ecryptfs_open: O_SDP is set, allow open, rc=%d\n", rc);
				mutex_lock(&crypt_stat->cs_mutex);
				crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
				mutex_unlock(&crypt_stat->cs_mutex);
			} else {
				mutex_lock(&crypt_stat->cs_mutex);
				crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
				mutex_unlock(&crypt_stat->cs_mutex);
				rc = -EACCES;
				goto out_put;
			}
//.........这里部分代码省略.........

static int ecryptfs_update_crypt_flag(struct dentry *dentry, int is_sensitive)
{
	int rc = 0;
	struct dentry *lower_dentry;
	struct inode *inode;
	struct inode *lower_inode;
	struct ecryptfs_crypt_stat *crypt_stat;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;

	crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
	if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
		ecryptfs_init_crypt_stat(crypt_stat);
	inode = dentry->d_inode;
	lower_inode = ecryptfs_inode_to_lower(inode);
	lower_dentry = ecryptfs_dentry_to_lower(dentry);

	mutex_lock(&crypt_stat->cs_mutex);

	mount_crypt_stat = &ecryptfs_superblock_to_private(
			dentry->d_sb)->mount_crypt_stat;
	rc = ecryptfs_get_lower_file(dentry, inode);
	if (rc) {
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("ecryptfs_get_lower_file rc=%d\n", rc);
		goto out;
	}

	if (is_sensitive) {
		crypt_stat->flags |= ECRYPTFS_DEK_IS_SENSITIVE;
		/*
		* Set sensirive for all the pages in the inode 
		*/
		set_sensitive_mapping_pages(inode->i_mapping, 0, -1);
	}
	else{
		crypt_stat->flags &= ~ECRYPTFS_DEK_IS_SENSITIVE;
	}

	rc = ecryptfs_write_metadata(dentry, inode);
	if (rc) {
		if (!(mount_crypt_stat->flags
				& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
			rc = -EIO;
			DEK_LOGE("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);
			DEK_LOGD("ecryptfs_write_metadata rc=%d\n", rc);
			goto out;
		}
		rc = 0;
		crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
				| ECRYPTFS_ENCRYPTED);
	}

	rc = ecryptfs_write_inode_size_to_metadata(inode);
	if (rc) {
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("Problem with "
				"ecryptfs_write_inode_size_to_metadata; "
				"rc = [%d]\n", rc);
		goto out;
	}

	ecryptfs_put_lower_file(inode);

	mutex_unlock(&crypt_stat->cs_mutex);

out:
	fsstack_copy_attr_all(inode, lower_inode);
	return rc;
}

//.........这里部分代码省略.........
	struct ecryptfs_file_info *file_info;
#ifdef CONFIG_DLP
	sdp_fs_command_t *cmd = NULL;

	ssize_t dlp_len = 0;
	struct knox_dlp_data dlp_data;
	struct timespec ts;
#endif

#if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) || defined(CONFIG_SDP)
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;	
	mount_crypt_stat = &ecryptfs_superblock_to_private(
							inode->i_sb)->mount_crypt_stat;
#endif

	/* 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 (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
#ifdef CONFIG_SDP
		/*
		 * it's possible to have a sensitive directory. (vault)
		 */
		if (mount_crypt_stat->flags & ECRYPTFS_MOUNT_SDP_ENABLED)
			crypt_stat->flags |= ECRYPTFS_DEK_SDP_ENABLED;
#endif
		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);

/**
 * ecryptfs_initialize_file
 *
 * Cause the file to be changed from a basic empty file to an ecryptfs
 * file with a header and first data page.
 *
 * Returns zero on success
 */
int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
			     struct inode *ecryptfs_inode)
{
	struct ecryptfs_crypt_stat *crypt_stat =
		&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
	int rc = 0;

#ifdef CONFIG_DLP
	sdp_fs_command_t *cmd = NULL;
#endif

	if (S_ISDIR(ecryptfs_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		goto out;
	}
	ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
	rc = ecryptfs_new_file_context(ecryptfs_inode);
	if (rc) {
		ecryptfs_printk(KERN_ERR, "Error creating new file "
				"context; rc = [%d]\n", rc);
		goto out;
	}
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_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;
	}
#ifdef CONFIG_DLP
	if(crypt_stat->mount_crypt_stat->flags & ECRYPTFS_MOUNT_DLP_ENABLED) {
#if DLP_DEBUG
		printk(KERN_ERR "DLP %s: file name: [%s], userid: [%d]\n",
				__func__, ecryptfs_dentry->d_iname, crypt_stat->mount_crypt_stat->userid);
#endif
		if(!rc && (in_egroup_p(AID_KNOX_DLP) || in_egroup_p(AID_KNOX_DLP_RESTRICTED))) {
			/* TODO: Can DLP files be created while in locked state? */
			struct timespec ts;
			crypt_stat->flags |= ECRYPTFS_DLP_ENABLED;
			getnstimeofday(&ts);
			crypt_stat->expiry.expiry_time.tv_sec = (int64_t)ts.tv_sec + 600;
			crypt_stat->expiry.expiry_time.tv_nsec = (int64_t)ts.tv_nsec;
#if DLP_DEBUG
			printk(KERN_ERR "DLP %s: current->pid : %d\n", __func__, current->tgid);
			printk(KERN_ERR "DLP %s: crypt_stat->mount_crypt_stat->userid : %d\n", __func__, crypt_stat->mount_crypt_stat->userid);
			printk(KERN_ERR "DLP %s: crypt_stat->mount_crypt_stat->partition_id : %d\n", __func__, crypt_stat->mount_crypt_stat->partition_id);
#endif
			if(in_egroup_p(AID_KNOX_DLP)) {
				cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_INIT,
                current->tgid, crypt_stat->mount_crypt_stat->userid, crypt_stat->mount_crypt_stat->partition_id,
                ecryptfs_inode->i_ino, GFP_KERNEL);
			}
			else if(in_egroup_p(AID_KNOX_DLP_RESTRICTED)) {
				cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_INIT_RESTRICTED,
                current->tgid, crypt_stat->mount_crypt_stat->userid, crypt_stat->mount_crypt_stat->partition_id,
                ecryptfs_inode->i_ino, GFP_KERNEL);
			}
		} else {
			printk(KERN_ERR "DLP %s: not in group\n", __func__);
		}
	}
#endif
#ifdef CONFIG_WTL_ENCRYPTION_FILTER
	mutex_lock(&crypt_stat->cs_mutex);
	if (crypt_stat->flags & ECRYPTFS_ENCRYPTED) {
		struct dentry *fp_dentry =
			ecryptfs_inode_to_private(ecryptfs_inode)
			->lower_file->f_dentry;
		struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
			&ecryptfs_superblock_to_private(ecryptfs_dentry->d_sb)
			->mount_crypt_stat;
		char filename[NAME_MAX+1] = {0};
		if (fp_dentry->d_name.len <= NAME_MAX)
			memcpy(filename, fp_dentry->d_name.name,
					fp_dentry->d_name.len + 1);

		if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_NEW_PASSTHROUGH)
		|| ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING) &&
			(is_file_name_match(mount_crypt_stat, fp_dentry) ||
			is_file_ext_match(mount_crypt_stat, filename)))) {
			crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
				| ECRYPTFS_ENCRYPTED);
			ecryptfs_put_lower_file(ecryptfs_inode);
		} else {
			rc = ecryptfs_write_metadata(ecryptfs_dentry,
				 ecryptfs_inode);
			if (rc)
				printk(
				KERN_ERR "Error writing headers; rc = [%d]\n"
				    , rc);
//.........这里部分代码省略.........