fs/9p: mkdir fix for setting S_ISGID bit as per parent directory
[linux-2.6.git] / fs / 9p / xattr_user.c
1 /*
2  * Copyright IBM Corporation, 2010
3  * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2.1 of the GNU Lesser General Public License
7  * as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12  *
13  */
14
15
16 #include <linux/module.h>
17 #include <linux/string.h>
18 #include <linux/fs.h>
19 #include <linux/slab.h>
20 #include "xattr.h"
21
22 static int v9fs_xattr_user_get(struct dentry *dentry, const char *name,
23                         void *buffer, size_t size, int type)
24 {
25         int retval;
26         char *full_name;
27         size_t name_len;
28         size_t prefix_len = XATTR_USER_PREFIX_LEN;
29
30         if (name == NULL)
31                 return -EINVAL;
32
33         if (strcmp(name, "") == 0)
34                 return -EINVAL;
35
36         name_len = strlen(name);
37         full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
38         if (!full_name)
39                 return -ENOMEM;
40         memcpy(full_name, XATTR_USER_PREFIX, prefix_len);
41         memcpy(full_name+prefix_len, name, name_len);
42         full_name[prefix_len + name_len] = '\0';
43
44         retval = v9fs_xattr_get(dentry, full_name, buffer, size);
45         kfree(full_name);
46         return retval;
47 }
48
49 static int v9fs_xattr_user_set(struct dentry *dentry, const char *name,
50                         const void *value, size_t size, int flags, int type)
51 {
52         int retval;
53         char *full_name;
54         size_t name_len;
55         size_t prefix_len = XATTR_USER_PREFIX_LEN;
56
57         if (name == NULL)
58                 return -EINVAL;
59
60         if (strcmp(name, "") == 0)
61                 return -EINVAL;
62
63         name_len = strlen(name);
64         full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
65         if (!full_name)
66                 return -ENOMEM;
67         memcpy(full_name, XATTR_USER_PREFIX, prefix_len);
68         memcpy(full_name + prefix_len, name, name_len);
69         full_name[prefix_len + name_len] = '\0';
70
71         retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
72         kfree(full_name);
73         return retval;
74 }
75
76 struct xattr_handler v9fs_xattr_user_handler = {
77         .prefix = XATTR_USER_PREFIX,
78         .get    = v9fs_xattr_user_get,
79         .set    = v9fs_xattr_user_set,
80 };