[deliverable/linux.git] / fs / ext2 / xattr_user.c

/*
 * linux/fs/ext2/xattr_user.c
 * Handler for extended user attributes.
 *
 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include "ext2.h"
#include "xattr.h"

#define XATTR_USER_PREFIX "user."

static size_t
ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size,
		     const char *name, size_t name_len)
{
	const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
	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
ext2_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 ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
}

static int
ext2_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 ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
			      value, size, flags);
}

struct xattr_handler ext2_xattr_user_handler = {
	.prefix	= XATTR_USER_PREFIX,
	.list	= ext2_xattr_user_list,
	.get	= ext2_xattr_user_get,
	.set	= ext2_xattr_user_set,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext2/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/init.h>
	9	#include <linux/module.h>
	10	#include <linux/string.h>
	11	#include "ext2.h"
	12	#include "xattr.h"
	13
	14	#define XATTR_USER_PREFIX "user."
	15
	16	static size_t
	17	ext2_xattr_user_list(struct inode inode, char list, size_t list_size,
	18	const char *name, size_t name_len)
	19	{
	20	const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
	21	const size_t total_len = prefix_len + name_len + 1;
	22
	23	if (!test_opt(inode->i_sb, XATTR_USER))
	24	return 0;
	25
	26	if (list && total_len <= list_size) {
	27	memcpy(list, XATTR_USER_PREFIX, prefix_len);
	28	memcpy(list+prefix_len, name, name_len);
	29	list[prefix_len + name_len] = '\0';
	30	}
	31	return total_len;
	32	}
	33
	34	static int
	35	ext2_xattr_user_get(struct inode inode, const char name,
	36	void *buffer, size_t size)
	37	{
1da177e4 LT	38	if (strcmp(name, "") == 0)
	39	return -EINVAL;
	40	if (!test_opt(inode->i_sb, XATTR_USER))
	41	return -EOPNOTSUPP;
1da177e4 LT	42	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
	43	}
	44
	45	static int
	46	ext2_xattr_user_set(struct inode inode, const char name,
	47	const void *value, size_t size, int flags)
	48	{
1da177e4 LT	49	if (strcmp(name, "") == 0)
	50	return -EINVAL;
	51	if (!test_opt(inode->i_sb, XATTR_USER))
	52	return -EOPNOTSUPP;
1da177e4 LT	53
	54	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
	55	value, size, flags);
	56	}
	57
	58	struct xattr_handler ext2_xattr_user_handler = {
	59	.prefix = XATTR_USER_PREFIX,
	60	.list = ext2_xattr_user_list,
	61	.get = ext2_xattr_user_get,
	62	.set = ext2_xattr_user_set,
	63	};