nfs41: implement DESTROY_CLIENTID operation
[linux-btrfs-devel.git] / fs / reiserfs / xattr_security.c
blobef66c18a933266e9c658fde311f7a1d0e2d6d023
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 const struct qstr *qstr,
58 struct reiserfs_security_handle *sec)
60 int blocks = 0;
61 int error;
63 sec->name = NULL;
65 /* Don't add selinux attributes on xattrs - they'll never get used */
66 if (IS_PRIVATE(dir))
67 return 0;
69 error = security_inode_init_security(inode, dir, qstr, &sec->name,
70 &sec->value, &sec->length);
71 if (error) {
72 if (error == -EOPNOTSUPP)
73 error = 0;
75 sec->name = NULL;
76 sec->value = NULL;
77 sec->length = 0;
78 return error;
81 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
82 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
83 reiserfs_xattr_nblocks(inode, sec->length);
84 /* We don't want to count the directories twice if we have
85 * a default ACL. */
86 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
88 return blocks;
91 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
92 struct inode *inode,
93 struct reiserfs_security_handle *sec)
95 int error;
96 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
97 return -EINVAL;
99 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
100 sec->length, XATTR_CREATE);
101 if (error == -ENODATA || error == -EOPNOTSUPP)
102 error = 0;
104 return error;
107 void reiserfs_security_free(struct reiserfs_security_handle *sec)
109 kfree(sec->name);
110 kfree(sec->value);
111 sec->name = NULL;
112 sec->value = NULL;
115 const struct xattr_handler reiserfs_xattr_security_handler = {
116 .prefix = XATTR_SECURITY_PREFIX,
117 .get = security_get,
118 .set = security_set,
119 .list = security_list,