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Commit | Line | Data |
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eef80d4a VD |
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 | ||
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 | ||
b0a7ab57 | 20 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); |
eef80d4a VD |
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 | ||
b0a7ab57 CH |
57 | int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, |
58 | int type) | |
eef80d4a VD |
59 | { |
60 | int err; | |
61 | char *xattr_name; | |
62 | size_t size = 0; | |
63 | char *value = NULL; | |
64 | ||
b0a7ab57 | 65 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); |
eef80d4a VD |
66 | |
67 | switch (type) { | |
68 | case ACL_TYPE_ACCESS: | |
69 | xattr_name = POSIX_ACL_XATTR_ACCESS; | |
70 | if (acl) { | |
71 | err = posix_acl_equiv_mode(acl, &inode->i_mode); | |
72 | if (err < 0) | |
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 | ||
111 | int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir) | |
112 | { | |
113 | int err = 0; | |
b0a7ab57 | 114 | struct posix_acl *default_acl, *acl; |
eef80d4a VD |
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 | ||
b0a7ab57 CH |
123 | err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
124 | if (err) | |
eef80d4a VD |
125 | return err; |
126 | ||
b0a7ab57 CH |
127 | if (default_acl) { |
128 | err = hfsplus_set_posix_acl(inode, default_acl, | |
129 | ACL_TYPE_DEFAULT); | |
130 | posix_acl_release(default_acl); | |
eef80d4a VD |
131 | } |
132 | ||
b0a7ab57 CH |
133 | if (acl) { |
134 | if (!err) | |
135 | err = hfsplus_set_posix_acl(inode, acl, | |
136 | ACL_TYPE_ACCESS); | |
137 | posix_acl_release(acl); | |
138 | } | |
eef80d4a VD |
139 | return err; |
140 | } |