1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/fs/hfs/attr.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * (C) 2003 Ardis Technologies <roman@ardistech.com>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Export hfs data via xattr
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/fs.h>
12*4882a593Smuzhiyun #include <linux/xattr.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "hfs_fs.h"
15*4882a593Smuzhiyun #include "btree.h"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun enum hfs_xattr_type {
18*4882a593Smuzhiyun HFS_TYPE,
19*4882a593Smuzhiyun HFS_CREATOR,
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
__hfs_setxattr(struct inode * inode,enum hfs_xattr_type type,const void * value,size_t size,int flags)22*4882a593Smuzhiyun static int __hfs_setxattr(struct inode *inode, enum hfs_xattr_type type,
23*4882a593Smuzhiyun const void *value, size_t size, int flags)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct hfs_find_data fd;
26*4882a593Smuzhiyun hfs_cat_rec rec;
27*4882a593Smuzhiyun struct hfs_cat_file *file;
28*4882a593Smuzhiyun int res;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
31*4882a593Smuzhiyun return -EOPNOTSUPP;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
34*4882a593Smuzhiyun if (res)
35*4882a593Smuzhiyun return res;
36*4882a593Smuzhiyun fd.search_key->cat = HFS_I(inode)->cat_key;
37*4882a593Smuzhiyun res = hfs_brec_find(&fd);
38*4882a593Smuzhiyun if (res)
39*4882a593Smuzhiyun goto out;
40*4882a593Smuzhiyun hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
41*4882a593Smuzhiyun sizeof(struct hfs_cat_file));
42*4882a593Smuzhiyun file = &rec.file;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun switch (type) {
45*4882a593Smuzhiyun case HFS_TYPE:
46*4882a593Smuzhiyun if (size == 4)
47*4882a593Smuzhiyun memcpy(&file->UsrWds.fdType, value, 4);
48*4882a593Smuzhiyun else
49*4882a593Smuzhiyun res = -ERANGE;
50*4882a593Smuzhiyun break;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun case HFS_CREATOR:
53*4882a593Smuzhiyun if (size == 4)
54*4882a593Smuzhiyun memcpy(&file->UsrWds.fdCreator, value, 4);
55*4882a593Smuzhiyun else
56*4882a593Smuzhiyun res = -ERANGE;
57*4882a593Smuzhiyun break;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (!res)
61*4882a593Smuzhiyun hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
62*4882a593Smuzhiyun sizeof(struct hfs_cat_file));
63*4882a593Smuzhiyun out:
64*4882a593Smuzhiyun hfs_find_exit(&fd);
65*4882a593Smuzhiyun return res;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
__hfs_getxattr(struct inode * inode,enum hfs_xattr_type type,void * value,size_t size)68*4882a593Smuzhiyun static ssize_t __hfs_getxattr(struct inode *inode, enum hfs_xattr_type type,
69*4882a593Smuzhiyun void *value, size_t size)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun struct hfs_find_data fd;
72*4882a593Smuzhiyun hfs_cat_rec rec;
73*4882a593Smuzhiyun struct hfs_cat_file *file;
74*4882a593Smuzhiyun ssize_t res = 0;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
77*4882a593Smuzhiyun return -EOPNOTSUPP;
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun if (size) {
80*4882a593Smuzhiyun res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
81*4882a593Smuzhiyun if (res)
82*4882a593Smuzhiyun return res;
83*4882a593Smuzhiyun fd.search_key->cat = HFS_I(inode)->cat_key;
84*4882a593Smuzhiyun res = hfs_brec_find(&fd);
85*4882a593Smuzhiyun if (res)
86*4882a593Smuzhiyun goto out;
87*4882a593Smuzhiyun hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
88*4882a593Smuzhiyun sizeof(struct hfs_cat_file));
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun file = &rec.file;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun switch (type) {
93*4882a593Smuzhiyun case HFS_TYPE:
94*4882a593Smuzhiyun if (size >= 4) {
95*4882a593Smuzhiyun memcpy(value, &file->UsrWds.fdType, 4);
96*4882a593Smuzhiyun res = 4;
97*4882a593Smuzhiyun } else
98*4882a593Smuzhiyun res = size ? -ERANGE : 4;
99*4882a593Smuzhiyun break;
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun case HFS_CREATOR:
102*4882a593Smuzhiyun if (size >= 4) {
103*4882a593Smuzhiyun memcpy(value, &file->UsrWds.fdCreator, 4);
104*4882a593Smuzhiyun res = 4;
105*4882a593Smuzhiyun } else
106*4882a593Smuzhiyun res = size ? -ERANGE : 4;
107*4882a593Smuzhiyun break;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun out:
111*4882a593Smuzhiyun if (size)
112*4882a593Smuzhiyun hfs_find_exit(&fd);
113*4882a593Smuzhiyun return res;
114*4882a593Smuzhiyun }
115*4882a593Smuzhiyun
hfs_xattr_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * value,size_t size,int flags)116*4882a593Smuzhiyun static int hfs_xattr_get(const struct xattr_handler *handler,
117*4882a593Smuzhiyun struct dentry *unused, struct inode *inode,
118*4882a593Smuzhiyun const char *name, void *value, size_t size, int flags)
119*4882a593Smuzhiyun {
120*4882a593Smuzhiyun return __hfs_getxattr(inode, handler->flags, value, size);
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun
hfs_xattr_set(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)123*4882a593Smuzhiyun static int hfs_xattr_set(const struct xattr_handler *handler,
124*4882a593Smuzhiyun struct dentry *unused, struct inode *inode,
125*4882a593Smuzhiyun const char *name, const void *value, size_t size,
126*4882a593Smuzhiyun int flags)
127*4882a593Smuzhiyun {
128*4882a593Smuzhiyun if (!value)
129*4882a593Smuzhiyun return -EOPNOTSUPP;
130*4882a593Smuzhiyun
131*4882a593Smuzhiyun return __hfs_setxattr(inode, handler->flags, value, size, flags);
132*4882a593Smuzhiyun }
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun static const struct xattr_handler hfs_creator_handler = {
135*4882a593Smuzhiyun .name = "hfs.creator",
136*4882a593Smuzhiyun .flags = HFS_CREATOR,
137*4882a593Smuzhiyun .get = hfs_xattr_get,
138*4882a593Smuzhiyun .set = hfs_xattr_set,
139*4882a593Smuzhiyun };
140*4882a593Smuzhiyun
141*4882a593Smuzhiyun static const struct xattr_handler hfs_type_handler = {
142*4882a593Smuzhiyun .name = "hfs.type",
143*4882a593Smuzhiyun .flags = HFS_TYPE,
144*4882a593Smuzhiyun .get = hfs_xattr_get,
145*4882a593Smuzhiyun .set = hfs_xattr_set,
146*4882a593Smuzhiyun };
147*4882a593Smuzhiyun
148*4882a593Smuzhiyun const struct xattr_handler *hfs_xattr_handlers[] = {
149*4882a593Smuzhiyun &hfs_creator_handler,
150*4882a593Smuzhiyun &hfs_type_handler,
151*4882a593Smuzhiyun NULL
152*4882a593Smuzhiyun };
153