Merge branch 'for-3.4/drivers' of git://git.kernel.dk/linux-block
[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / reiserfs / xattr_trusted.c
1 #include "reiserfs.h"
2 #include <linux/capability.h>
3 #include <linux/errno.h>
4 #include <linux/fs.h>
5 #include <linux/pagemap.h>
6 #include <linux/xattr.h>
7 #include "xattr.h"
8 #include <asm/uaccess.h>
9
10 static int
11 trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
12             int handler_flags)
13 {
14         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
15                 return -EINVAL;
16
17         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
18                 return -EPERM;
19
20         return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
21 }
22
23 static int
24 trusted_set(struct dentry *dentry, const char *name, const void *buffer,
25             size_t size, int flags, int handler_flags)
26 {
27         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
28                 return -EINVAL;
29
30         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
31                 return -EPERM;
32
33         return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
34 }
35
36 static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
37                            const char *name, size_t name_len, int handler_flags)
38 {
39         const size_t len = name_len + 1;
40
41         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
42                 return 0;
43
44         if (list && len <= list_size) {
45                 memcpy(list, name, name_len);
46                 list[name_len] = '\0';
47         }
48         return len;
49 }
50
51 const struct xattr_handler reiserfs_xattr_trusted_handler = {
52         .prefix = XATTR_TRUSTED_PREFIX,
53         .get = trusted_get,
54         .set = trusted_set,
55         .list = trusted_list,
56 };