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/*
* 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)
{
int error;
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(inode->i_sb, XATTR_USER))
return -EOPNOTSUPP;
error = permission(inode, MAY_READ, NULL);
if (error)
return error;
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)
{
int error;
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(inode->i_sb, XATTR_USER))
return -EOPNOTSUPP;
if ( !S_ISREG(inode->i_mode) &&
(!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
return -EPERM;
error = permission(inode, MAY_WRITE, NULL);
if (error)
return error;
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,
};
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