Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr_user.c |
ac27a0ec DK |
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> | |
dab291af | 11 | #include <linux/ext4_jbd2.h> |
617ba13b | 12 | #include <linux/ext4_fs.h> |
ac27a0ec DK |
13 | #include "xattr.h" |
14 | ||
15 | #define XATTR_USER_PREFIX "user." | |
16 | ||
17 | static size_t | |
617ba13b | 18 | ext4_xattr_user_list(struct inode *inode, char *list, size_t list_size, |
ac27a0ec DK |
19 | const char *name, size_t name_len) |
20 | { | |
21 | const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1; | |
22 | const size_t total_len = prefix_len + name_len + 1; | |
23 | ||
24 | if (!test_opt(inode->i_sb, XATTR_USER)) | |
25 | return 0; | |
26 | ||
27 | if (list && total_len <= list_size) { | |
28 | memcpy(list, XATTR_USER_PREFIX, prefix_len); | |
29 | memcpy(list+prefix_len, name, name_len); | |
30 | list[prefix_len + name_len] = '\0'; | |
31 | } | |
32 | return total_len; | |
33 | } | |
34 | ||
35 | static int | |
617ba13b | 36 | ext4_xattr_user_get(struct inode *inode, const char *name, |
ac27a0ec DK |
37 | void *buffer, size_t size) |
38 | { | |
39 | if (strcmp(name, "") == 0) | |
40 | return -EINVAL; | |
41 | if (!test_opt(inode->i_sb, XATTR_USER)) | |
42 | return -EOPNOTSUPP; | |
617ba13b | 43 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER, name, buffer, size); |
ac27a0ec DK |
44 | } |
45 | ||
46 | static int | |
617ba13b | 47 | ext4_xattr_user_set(struct inode *inode, const char *name, |
ac27a0ec DK |
48 | const void *value, size_t size, int flags) |
49 | { | |
50 | if (strcmp(name, "") == 0) | |
51 | return -EINVAL; | |
52 | if (!test_opt(inode->i_sb, XATTR_USER)) | |
53 | return -EOPNOTSUPP; | |
617ba13b | 54 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER, name, |
ac27a0ec DK |
55 | value, size, flags); |
56 | } | |
57 | ||
617ba13b | 58 | struct xattr_handler ext4_xattr_user_handler = { |
ac27a0ec | 59 | .prefix = XATTR_USER_PREFIX, |
617ba13b MC |
60 | .list = ext4_xattr_user_list, |
61 | .get = ext4_xattr_user_get, | |
62 | .set = ext4_xattr_user_set, | |
ac27a0ec | 63 | }; |