davinci: mityomapl138: make file local data static
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / xattr_security.c
blob237c6928d3c69fe6901ea7abf74e4e6b1a220800
1 #include <linux/reiserfs_fs.h>
2 #include <linux/errno.h>
3 #include <linux/fs.h>
4 #include <linux/pagemap.h>
5 #include <linux/xattr.h>
6 #include <linux/slab.h>
7 #include <linux/reiserfs_xattr.h>
8 #include <linux/security.h>
9 #include <asm/uaccess.h>
11 static int
12 security_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
13 int handler_flags)
15 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
16 return -EINVAL;
18 if (IS_PRIVATE(dentry->d_inode))
19 return -EPERM;
21 return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
24 static int
25 security_set(struct dentry *dentry, const char *name, const void *buffer,
26 size_t size, int flags, int handler_flags)
28 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
29 return -EINVAL;
31 if (IS_PRIVATE(dentry->d_inode))
32 return -EPERM;
34 return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
37 static size_t security_list(struct dentry *dentry, char *list, size_t list_len,
38 const char *name, size_t namelen, int handler_flags)
40 const size_t len = namelen + 1;
42 if (IS_PRIVATE(dentry->d_inode))
43 return 0;
45 if (list && len <= list_len) {
46 memcpy(list, name, namelen);
47 list[namelen] = '\0';
50 return len;
53 /* Initializes the security context for a new inode and returns the number
54 * of blocks needed for the transaction. If successful, reiserfs_security
55 * must be released using reiserfs_security_free when the caller is done. */
56 int reiserfs_security_init(struct inode *dir, struct inode *inode,
57 struct reiserfs_security_handle *sec)
59 int blocks = 0;
60 int error;
62 sec->name = NULL;
64 /* Don't add selinux attributes on xattrs - they'll never get used */
65 if (IS_PRIVATE(dir))
66 return 0;
68 error = security_inode_init_security(inode, dir, &sec->name,
69 &sec->value, &sec->length);
70 if (error) {
71 if (error == -EOPNOTSUPP)
72 error = 0;
74 sec->name = NULL;
75 sec->value = NULL;
76 sec->length = 0;
77 return error;
80 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
81 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
82 reiserfs_xattr_nblocks(inode, sec->length);
83 /* We don't want to count the directories twice if we have
84 * a default ACL. */
85 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
87 return blocks;
90 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
91 struct inode *inode,
92 struct reiserfs_security_handle *sec)
94 int error;
95 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
96 return -EINVAL;
98 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
99 sec->length, XATTR_CREATE);
100 if (error == -ENODATA || error == -EOPNOTSUPP)
101 error = 0;
103 return error;
106 void reiserfs_security_free(struct reiserfs_security_handle *sec)
108 kfree(sec->name);
109 kfree(sec->value);
110 sec->name = NULL;
111 sec->value = NULL;
114 const struct xattr_handler reiserfs_xattr_security_handler = {
115 .prefix = XATTR_SECURITY_PREFIX,
116 .get = security_get,
117 .set = security_set,
118 .list = security_list,