linux/fs/ext4/xattr_user.c
Mingming Cao dab291af8d [PATCH] jbd2: enable building of jbd2 and have ext4 use it rather than jbd
Reworked from a patch by Mingming Cao and Randy Dunlap

Signed-off-By: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-11 11:14:16 -07:00

64 lines
1.6 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 <linux/smp_lock.h>
#include <linux/ext4_jbd2.h>
#include <linux/ext4_fs.h>
#include "xattr.h"
#define XATTR_USER_PREFIX "user."
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 = 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
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,
};