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Commit | Line | Data |
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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 | ||
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 = XATTR_NAME_POSIX_ACL_ACCESS; | |
25 | break; | |
26 | case ACL_TYPE_DEFAULT: | |
27 | xattr_name = XATTR_NAME_POSIX_ACL_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 | return acl; | |
52 | } | |
53 | ||
54 | static int __hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, | |
55 | int type) | |
56 | { | |
57 | int err; | |
58 | char *xattr_name; | |
59 | size_t size = 0; | |
60 | char *value = NULL; | |
61 | ||
62 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); | |
63 | ||
64 | switch (type) { | |
65 | case ACL_TYPE_ACCESS: | |
66 | xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; | |
67 | break; | |
68 | ||
69 | case ACL_TYPE_DEFAULT: | |
70 | xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT; | |
71 | if (!S_ISDIR(inode->i_mode)) | |
72 | return acl ? -EACCES : 0; | |
73 | break; | |
74 | ||
75 | default: | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
79 | if (acl) { | |
80 | size = posix_acl_xattr_size(acl->a_count); | |
81 | if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE)) | |
82 | return -ENOMEM; | |
83 | value = (char *)hfsplus_alloc_attr_entry(); | |
84 | if (unlikely(!value)) | |
85 | return -ENOMEM; | |
86 | err = posix_acl_to_xattr(&init_user_ns, acl, value, size); | |
87 | if (unlikely(err < 0)) | |
88 | goto end_set_acl; | |
89 | } | |
90 | ||
91 | err = __hfsplus_setxattr(inode, xattr_name, value, size, 0); | |
92 | ||
93 | end_set_acl: | |
94 | hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value); | |
95 | ||
96 | if (!err) | |
97 | set_cached_acl(inode, type, acl); | |
98 | ||
99 | return err; | |
100 | } | |
101 | ||
102 | int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type) | |
103 | { | |
104 | int err; | |
105 | ||
106 | if (type == ACL_TYPE_ACCESS && acl) { | |
107 | err = posix_acl_update_mode(inode, &inode->i_mode, &acl); | |
108 | if (err) | |
109 | return err; | |
110 | } | |
111 | return __hfsplus_set_posix_acl(inode, acl, type); | |
112 | } | |
113 | ||
114 | int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir) | |
115 | { | |
116 | int err = 0; | |
117 | struct posix_acl *default_acl, *acl; | |
118 | ||
119 | hfs_dbg(ACL_MOD, | |
120 | "[%s]: ino %lu, dir->ino %lu\n", | |
121 | __func__, inode->i_ino, dir->i_ino); | |
122 | ||
123 | if (S_ISLNK(inode->i_mode)) | |
124 | return 0; | |
125 | ||
126 | err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); | |
127 | if (err) | |
128 | return err; | |
129 | ||
130 | if (default_acl) { | |
131 | err = __hfsplus_set_posix_acl(inode, default_acl, | |
132 | ACL_TYPE_DEFAULT); | |
133 | posix_acl_release(default_acl); | |
134 | } | |
135 | ||
136 | if (acl) { | |
137 | if (!err) | |
138 | err = __hfsplus_set_posix_acl(inode, acl, | |
139 | ACL_TYPE_ACCESS); | |
140 | posix_acl_release(acl); | |
141 | } | |
142 | return err; | |
143 | } |