62 lines
1.5 KiB
C
62 lines
1.5 KiB
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,
|
|
};
|