[deliverable/linux.git] / fs / ext4 / xattr_user.c

/*
 * linux/fs/ext4/xattr_user.c
 * Handler for extended user attributes.
 *
 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "xattr.h"

static size_t
ext4_xattr_user_list(struct inode *inode, char *list, size_t list_size,
		     const char *name, size_t name_len)
{
	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
	const size_t total_len = prefix_len + name_len + 1;

	if (!test_opt(inode->i_sb, XATTR_USER))
		return 0;

	if (list && total_len <= list_size) {
		memcpy(list, XATTR_USER_PREFIX, prefix_len);
		memcpy(list+prefix_len, name, name_len);
		list[prefix_len + name_len] = '\0';
	}
	return total_len;
}

static int
ext4_xattr_user_get(struct inode *inode, const char *name,
		    void *buffer, size_t size)
{
	if (strcmp(name, "") == 0)
		return -EINVAL;
	if (!test_opt(inode->i_sb, XATTR_USER))
		return -EOPNOTSUPP;
	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER, name, buffer, size);
}

static int
ext4_xattr_user_set(struct inode *inode, const char *name,
		    const void *value, size_t size, int flags)
{
	if (strcmp(name, "") == 0)
		return -EINVAL;
	if (!test_opt(inode->i_sb, XATTR_USER))
		return -EOPNOTSUPP;
	return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER, name,
			      value, size, flags);
}

struct xattr_handler ext4_xattr_user_handler = {
	.prefix	= XATTR_USER_PREFIX,
	.list	= ext4_xattr_user_list,
	.get	= ext4_xattr_user_get,
	.set	= ext4_xattr_user_set,
};
Commit	Line	Data
	1	/*
	2	* linux/fs/ext4/xattr_user.c
	3	* Handler for extended user attributes.
	4	*
	5	* Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/string.h>
	10	#include <linux/fs.h>
	11	#include "ext4_jbd2.h"
	12	#include "ext4.h"
	13	#include "xattr.h"
	14
	15	static size_t
	16	ext4_xattr_user_list(struct inode inode, char list, size_t list_size,
	17	const char *name, size_t name_len)
	18	{
	19	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
	20	const size_t total_len = prefix_len + name_len + 1;
	21
	22	if (!test_opt(inode->i_sb, XATTR_USER))
	23	return 0;
	24
	25	if (list && total_len <= list_size) {
	26	memcpy(list, XATTR_USER_PREFIX, prefix_len);
	27	memcpy(list+prefix_len, name, name_len);
	28	list[prefix_len + name_len] = '\0';
	29	}
	30	return total_len;
	31	}
	32
	33	static int
	34	ext4_xattr_user_get(struct inode inode, const char name,
	35	void *buffer, size_t size)
	36	{
	37	if (strcmp(name, "") == 0)
	38	return -EINVAL;
	39	if (!test_opt(inode->i_sb, XATTR_USER))
	40	return -EOPNOTSUPP;
	41	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER, name, buffer, size);
	42	}
	43
	44	static int
	45	ext4_xattr_user_set(struct inode inode, const char name,
	46	const void *value, size_t size, int flags)
	47	{
	48	if (strcmp(name, "") == 0)
	49	return -EINVAL;
	50	if (!test_opt(inode->i_sb, XATTR_USER))
	51	return -EOPNOTSUPP;
	52	return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER, name,
	53	value, size, flags);
	54	}
	55
	56	struct xattr_handler ext4_xattr_user_handler = {
	57	.prefix = XATTR_USER_PREFIX,
	58	.list = ext4_xattr_user_list,
	59	.get = ext4_xattr_user_get,
	60	.set = ext4_xattr_user_set,
	61	};