1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/hfs/attr.c
4 *
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 *
7 * Export hfs data via xattr
8 */
9
10
11 #include <linux/fs.h>
12 #include <linux/xattr.h>
13
14 #include "hfs_fs.h"
15 #include "btree.h"
16
17 enum hfs_xattr_type {
18 HFS_TYPE,
19 HFS_CREATOR,
20 };
21
22 static int __hfs_setxattr(struct inode *inode, enum hfs_xattr_type type,
23 const void *value, size_t size, int flags)
24 {
25 struct hfs_find_data fd;
26 hfs_cat_rec rec;
27 struct hfs_cat_file *file;
28 int res;
29
30 if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
31 return -EOPNOTSUPP;
32
33 res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
34 if (res)
35 return res;
36 fd.search_key->cat = HFS_I(inode)->cat_key;
37 res = hfs_brec_find(&fd);
38 if (res)
39 goto out;
40 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
41 sizeof(struct hfs_cat_file));
42 file = &rec.file;
43
44 switch (type) {
45 case HFS_TYPE:
46 if (size == 4)
47 memcpy(&file->UsrWds.fdType, value, 4);
48 else
49 res = -ERANGE;
50 break;
51
52 case HFS_CREATOR:
53 if (size == 4)
54 memcpy(&file->UsrWds.fdCreator, value, 4);
55 else
56 res = -ERANGE;
57 break;
58 }
59
60 if (!res)
61 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
62 sizeof(struct hfs_cat_file));
63 out:
64 hfs_find_exit(&fd);
65 return res;
66 }
67
68 static ssize_t __hfs_getxattr(struct inode *inode, enum hfs_xattr_type type,
69 void *value, size_t size)
70 {
71 struct hfs_find_data fd;
72 hfs_cat_rec rec;
73 struct hfs_cat_file *file;
74 ssize_t res = 0;
75
76 if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
77 return -EOPNOTSUPP;
78
79 if (size) {
80 res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
81 if (res)
82 return res;
83 fd.search_key->cat = HFS_I(inode)->cat_key;
84 res = hfs_brec_find(&fd);
85 if (res)
86 goto out;
87 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
88 sizeof(struct hfs_cat_file));
89 }
90 file = &rec.file;
91
92 switch (type) {
93 case HFS_TYPE:
94 if (size >= 4) {
95 memcpy(value, &file->UsrWds.fdType, 4);
96 res = 4;
97 } else
98 res = size ? -ERANGE : 4;
99 break;
100
101 case HFS_CREATOR:
102 if (size >= 4) {
103 memcpy(value, &file->UsrWds.fdCreator, 4);
104 res = 4;
105 } else
106 res = size ? -ERANGE : 4;
107 break;
108 }
109
110 out:
111 if (size)
112 hfs_find_exit(&fd);
113 return res;
114 }
115
116 static int hfs_xattr_get(const struct xattr_handler *handler,
117 struct dentry *unused, struct inode *inode,
118 const char *name, void *value, size_t size)
119 {
120 return __hfs_getxattr(inode, handler->flags, value, size);
121 }
122
123 static int hfs_xattr_set(const struct xattr_handler *handler,
124 struct mnt_idmap *idmap,
125 struct dentry *unused, struct inode *inode,
126 const char *name, const void *value, size_t size,
127 int flags)
128 {
129 if (!value)
130 return -EOPNOTSUPP;
131
132 return __hfs_setxattr(inode, handler->flags, value, size, flags);
133 }
134
135 static const struct xattr_handler hfs_creator_handler = {
136 .name = "hfs.creator",
137 .flags = HFS_CREATOR,
138 .get = hfs_xattr_get,
139 .set = hfs_xattr_set,
140 };
141
142 static const struct xattr_handler hfs_type_handler = {
143 .name = "hfs.type",
144 .flags = HFS_TYPE,
145 .get = hfs_xattr_get,
146 .set = hfs_xattr_set,
147 };
148
149 const struct xattr_handler * const hfs_xattr_handlers[] = {
150 &hfs_creator_handler,
151 &hfs_type_handler,
152 NULL
153 };
154
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