Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
eef80d4a VD |
2 | /* |
3 | * linux/fs/hfsplus/posix_acl.c | |
4 | * | |
5 | * Vyacheslav Dubeyko <slava@dubeyko.com> | |
6 | * | |
7 | * Handler for Posix Access Control Lists (ACLs) support. | |
8 | */ | |
9 | ||
10 | #include "hfsplus_fs.h" | |
11 | #include "xattr.h" | |
12 | #include "acl.h" | |
13 | ||
14 | struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type) | |
15 | { | |
16 | struct posix_acl *acl; | |
17 | char *xattr_name; | |
18 | char *value = NULL; | |
19 | ssize_t size; | |
20 | ||
b0a7ab57 | 21 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); |
eef80d4a VD |
22 | |
23 | switch (type) { | |
24 | case ACL_TYPE_ACCESS: | |
97d79299 | 25 | xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; |
eef80d4a VD |
26 | break; |
27 | case ACL_TYPE_DEFAULT: | |
97d79299 | 28 | xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT; |
eef80d4a VD |
29 | break; |
30 | default: | |
31 | return ERR_PTR(-EINVAL); | |
32 | } | |
33 | ||
34 | size = __hfsplus_getxattr(inode, xattr_name, NULL, 0); | |
35 | ||
36 | if (size > 0) { | |
37 | value = (char *)hfsplus_alloc_attr_entry(); | |
38 | if (unlikely(!value)) | |
39 | return ERR_PTR(-ENOMEM); | |
40 | size = __hfsplus_getxattr(inode, xattr_name, value, size); | |
41 | } | |
42 | ||
43 | if (size > 0) | |
44 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
45 | else if (size == -ENODATA) | |
46 | acl = NULL; | |
47 | else | |
48 | acl = ERR_PTR(size); | |
49 | ||
50 | hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value); | |
51 | ||
eef80d4a VD |
52 | return acl; |
53 | } | |
54 | ||
84969465 JK |
55 | static int __hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, |
56 | int type) | |
eef80d4a VD |
57 | { |
58 | int err; | |
59 | char *xattr_name; | |
60 | size_t size = 0; | |
61 | char *value = NULL; | |
62 | ||
b0a7ab57 | 63 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); |
eef80d4a VD |
64 | |
65 | switch (type) { | |
66 | case ACL_TYPE_ACCESS: | |
97d79299 | 67 | xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; |
eef80d4a VD |
68 | break; |
69 | ||
70 | case ACL_TYPE_DEFAULT: | |
97d79299 | 71 | xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT; |
eef80d4a VD |
72 | if (!S_ISDIR(inode->i_mode)) |
73 | return acl ? -EACCES : 0; | |
74 | break; | |
75 | ||
76 | default: | |
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | if (acl) { | |
81 | size = posix_acl_xattr_size(acl->a_count); | |
82 | if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE)) | |
83 | return -ENOMEM; | |
84 | value = (char *)hfsplus_alloc_attr_entry(); | |
85 | if (unlikely(!value)) | |
86 | return -ENOMEM; | |
87 | err = posix_acl_to_xattr(&init_user_ns, acl, value, size); | |
88 | if (unlikely(err < 0)) | |
89 | goto end_set_acl; | |
90 | } | |
91 | ||
92 | err = __hfsplus_setxattr(inode, xattr_name, value, size, 0); | |
93 | ||
94 | end_set_acl: | |
95 | hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value); | |
96 | ||
97 | if (!err) | |
98 | set_cached_acl(inode, type, acl); | |
99 | ||
100 | return err; | |
101 | } | |
102 | ||
84969465 JK |
103 | int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type) |
104 | { | |
105 | int err; | |
106 | ||
107 | if (type == ACL_TYPE_ACCESS && acl) { | |
108 | err = posix_acl_update_mode(inode, &inode->i_mode, &acl); | |
109 | if (err) | |
110 | return err; | |
111 | } | |
112 | return __hfsplus_set_posix_acl(inode, acl, type); | |
113 | } | |
114 | ||
eef80d4a VD |
115 | int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir) |
116 | { | |
117 | int err = 0; | |
b0a7ab57 | 118 | struct posix_acl *default_acl, *acl; |
eef80d4a VD |
119 | |
120 | hfs_dbg(ACL_MOD, | |
121 | "[%s]: ino %lu, dir->ino %lu\n", | |
122 | __func__, inode->i_ino, dir->i_ino); | |
123 | ||
124 | if (S_ISLNK(inode->i_mode)) | |
125 | return 0; | |
126 | ||
b0a7ab57 CH |
127 | err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
128 | if (err) | |
eef80d4a VD |
129 | return err; |
130 | ||
b0a7ab57 | 131 | if (default_acl) { |
84969465 JK |
132 | err = __hfsplus_set_posix_acl(inode, default_acl, |
133 | ACL_TYPE_DEFAULT); | |
b0a7ab57 | 134 | posix_acl_release(default_acl); |
eef80d4a VD |
135 | } |
136 | ||
b0a7ab57 CH |
137 | if (acl) { |
138 | if (!err) | |
84969465 JK |
139 | err = __hfsplus_set_posix_acl(inode, acl, |
140 | ACL_TYPE_ACCESS); | |
b0a7ab57 CH |
141 | posix_acl_release(acl); |
142 | } | |
eef80d4a VD |
143 | return err; |
144 | } |