1 /*
2 * linux/fs/hfsplus/posix_acl.c
3 *
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
5 *
6 * Handler for Posix Access Control Lists (ACLs) support.
7 */
8
9 #include "hfsplus_fs.h"
10 #include "xattr.h"
11 #include "acl.h"
12
hfsplus_get_posix_acl(struct inode * inode,int type)13 struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
14 {
15 struct posix_acl *acl;
16 char *xattr_name;
17 char *value = NULL;
18 ssize_t size;
19
20 hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
21
22 switch (type) {
23 case ACL_TYPE_ACCESS:
24 xattr_name = POSIX_ACL_XATTR_ACCESS;
25 break;
26 case ACL_TYPE_DEFAULT:
27 xattr_name = POSIX_ACL_XATTR_DEFAULT;
28 break;
29 default:
30 return ERR_PTR(-EINVAL);
31 }
32
33 size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
34
35 if (size > 0) {
36 value = (char *)hfsplus_alloc_attr_entry();
37 if (unlikely(!value))
38 return ERR_PTR(-ENOMEM);
39 size = __hfsplus_getxattr(inode, xattr_name, value, size);
40 }
41
42 if (size > 0)
43 acl = posix_acl_from_xattr(&init_user_ns, value, size);
44 else if (size == -ENODATA)
45 acl = NULL;
46 else
47 acl = ERR_PTR(size);
48
49 hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
50
51 if (!IS_ERR(acl))
52 set_cached_acl(inode, type, acl);
53
54 return acl;
55 }
56
hfsplus_set_posix_acl(struct inode * inode,struct posix_acl * acl,int type)57 int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
58 int type)
59 {
60 int err;
61 char *xattr_name;
62 size_t size = 0;
63 char *value = NULL;
64
65 hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
66
67 switch (type) {
68 case ACL_TYPE_ACCESS:
69 xattr_name = POSIX_ACL_XATTR_ACCESS;
70 if (acl) {
71 err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
72 if (err)
73 return err;
74 }
75 err = 0;
76 break;
77
78 case ACL_TYPE_DEFAULT:
79 xattr_name = POSIX_ACL_XATTR_DEFAULT;
80 if (!S_ISDIR(inode->i_mode))
81 return acl ? -EACCES : 0;
82 break;
83
84 default:
85 return -EINVAL;
86 }
87
88 if (acl) {
89 size = posix_acl_xattr_size(acl->a_count);
90 if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
91 return -ENOMEM;
92 value = (char *)hfsplus_alloc_attr_entry();
93 if (unlikely(!value))
94 return -ENOMEM;
95 err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
96 if (unlikely(err < 0))
97 goto end_set_acl;
98 }
99
100 err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
101
102 end_set_acl:
103 hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
104
105 if (!err)
106 set_cached_acl(inode, type, acl);
107
108 return err;
109 }
110
hfsplus_init_posix_acl(struct inode * inode,struct inode * dir)111 int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
112 {
113 int err = 0;
114 struct posix_acl *default_acl, *acl;
115
116 hfs_dbg(ACL_MOD,
117 "[%s]: ino %lu, dir->ino %lu\n",
118 __func__, inode->i_ino, dir->i_ino);
119
120 if (S_ISLNK(inode->i_mode))
121 return 0;
122
123 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
124 if (err)
125 return err;
126
127 if (default_acl) {
128 err = hfsplus_set_posix_acl(inode, default_acl,
129 ACL_TYPE_DEFAULT);
130 posix_acl_release(default_acl);
131 }
132
133 if (acl) {
134 if (!err)
135 err = hfsplus_set_posix_acl(inode, acl,
136 ACL_TYPE_ACCESS);
137 posix_acl_release(acl);
138 }
139 return err;
140 }
141