eCryptfs: Remove mmap from directory operations
[linux/fpc-iii.git] / fs / reiserfs / xattr_security.c
blobd8b5bfcbdd30b027aae6c9eae937b566b7b2043d
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/reiserfs_xattr.h>
7 #include <linux/security.h>
8 #include <asm/uaccess.h>
10 static int
11 security_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
12 int handler_flags)
14 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
15 return -EINVAL;
17 if (IS_PRIVATE(dentry->d_inode))
18 return -EPERM;
20 return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
23 static int
24 security_set(struct dentry *dentry, const char *name, const void *buffer,
25 size_t size, int flags, int handler_flags)
27 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
28 return -EINVAL;
30 if (IS_PRIVATE(dentry->d_inode))
31 return -EPERM;
33 return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
36 static size_t security_list(struct dentry *dentry, char *list, size_t list_len,
37 const char *name, size_t namelen, int handler_flags)
39 const size_t len = namelen + 1;
41 if (IS_PRIVATE(dentry->d_inode))
42 return 0;
44 if (list && len <= list_len) {
45 memcpy(list, name, namelen);
46 list[namelen] = '\0';
49 return len;
52 /* Initializes the security context for a new inode and returns the number
53 * of blocks needed for the transaction. If successful, reiserfs_security
54 * must be released using reiserfs_security_free when the caller is done. */
55 int reiserfs_security_init(struct inode *dir, struct inode *inode,
56 struct reiserfs_security_handle *sec)
58 int blocks = 0;
59 int error;
61 sec->name = NULL;
63 /* Don't add selinux attributes on xattrs - they'll never get used */
64 if (IS_PRIVATE(dir))
65 return 0;
67 error = security_inode_init_security(inode, dir, &sec->name,
68 &sec->value, &sec->length);
69 if (error) {
70 if (error == -EOPNOTSUPP)
71 error = 0;
73 sec->name = NULL;
74 sec->value = NULL;
75 sec->length = 0;
76 return error;
79 if (sec->length) {
80 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
81 reiserfs_xattr_nblocks(inode, sec->length);
82 /* We don't want to count the directories twice if we have
83 * a default ACL. */
84 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
86 return blocks;
89 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
90 struct inode *inode,
91 struct reiserfs_security_handle *sec)
93 int error;
94 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
95 return -EINVAL;
97 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
98 sec->length, XATTR_CREATE);
99 if (error == -ENODATA || error == -EOPNOTSUPP)
100 error = 0;
102 return error;
105 void reiserfs_security_free(struct reiserfs_security_handle *sec)
107 kfree(sec->name);
108 kfree(sec->value);
109 sec->name = NULL;
110 sec->value = NULL;
113 struct xattr_handler reiserfs_xattr_security_handler = {
114 .prefix = XATTR_SECURITY_PREFIX,
115 .get = security_get,
116 .set = security_set,
117 .list = security_list,