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9#include "fuse_i.h"
10
11#include <linux/xattr.h>
12#include <linux/posix_acl_xattr.h>
13
14int fuse_setxattr(struct inode *inode, const char *name, const void *value,
15 size_t size, int flags)
16{
17 struct fuse_conn *fc = get_fuse_conn(inode);
18 FUSE_ARGS(args);
19 struct fuse_setxattr_in inarg;
20 int err;
21
22 if (fc->no_setxattr)
23 return -EOPNOTSUPP;
24
25 memset(&inarg, 0, sizeof(inarg));
26 inarg.size = size;
27 inarg.flags = flags;
28 args.in.h.opcode = FUSE_SETXATTR;
29 args.in.h.nodeid = get_node_id(inode);
30 args.in.numargs = 3;
31 args.in.args[0].size = sizeof(inarg);
32 args.in.args[0].value = &inarg;
33 args.in.args[1].size = strlen(name) + 1;
34 args.in.args[1].value = name;
35 args.in.args[2].size = size;
36 args.in.args[2].value = value;
37 err = fuse_simple_request(fc, &args);
38 if (err == -ENOSYS) {
39 fc->no_setxattr = 1;
40 err = -EOPNOTSUPP;
41 }
42 if (!err) {
43 fuse_invalidate_attr(inode);
44 fuse_update_ctime(inode);
45 }
46 return err;
47}
48
49ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
50 size_t size)
51{
52 struct fuse_conn *fc = get_fuse_conn(inode);
53 FUSE_ARGS(args);
54 struct fuse_getxattr_in inarg;
55 struct fuse_getxattr_out outarg;
56 ssize_t ret;
57
58 if (fc->no_getxattr)
59 return -EOPNOTSUPP;
60
61 memset(&inarg, 0, sizeof(inarg));
62 inarg.size = size;
63 args.in.h.opcode = FUSE_GETXATTR;
64 args.in.h.nodeid = get_node_id(inode);
65 args.in.numargs = 2;
66 args.in.args[0].size = sizeof(inarg);
67 args.in.args[0].value = &inarg;
68 args.in.args[1].size = strlen(name) + 1;
69 args.in.args[1].value = name;
70
71 args.out.numargs = 1;
72 if (size) {
73 args.out.argvar = 1;
74 args.out.args[0].size = size;
75 args.out.args[0].value = value;
76 } else {
77 args.out.args[0].size = sizeof(outarg);
78 args.out.args[0].value = &outarg;
79 }
80 ret = fuse_simple_request(fc, &args);
81 if (!ret && !size)
82 ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
83 if (ret == -ENOSYS) {
84 fc->no_getxattr = 1;
85 ret = -EOPNOTSUPP;
86 }
87 return ret;
88}
89
90static int fuse_verify_xattr_list(char *list, size_t size)
91{
92 size_t origsize = size;
93
94 while (size) {
95 size_t thislen = strnlen(list, size);
96
97 if (!thislen || thislen == size)
98 return -EIO;
99
100 size -= thislen + 1;
101 list += thislen + 1;
102 }
103
104 return origsize;
105}
106
107ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
108{
109 struct inode *inode = d_inode(entry);
110 struct fuse_conn *fc = get_fuse_conn(inode);
111 FUSE_ARGS(args);
112 struct fuse_getxattr_in inarg;
113 struct fuse_getxattr_out outarg;
114 ssize_t ret;
115
116 if (!fuse_allow_current_process(fc))
117 return -EACCES;
118
119 if (fc->no_listxattr)
120 return -EOPNOTSUPP;
121
122 memset(&inarg, 0, sizeof(inarg));
123 inarg.size = size;
124 args.in.h.opcode = FUSE_LISTXATTR;
125 args.in.h.nodeid = get_node_id(inode);
126 args.in.numargs = 1;
127 args.in.args[0].size = sizeof(inarg);
128 args.in.args[0].value = &inarg;
129
130 args.out.numargs = 1;
131 if (size) {
132 args.out.argvar = 1;
133 args.out.args[0].size = size;
134 args.out.args[0].value = list;
135 } else {
136 args.out.args[0].size = sizeof(outarg);
137 args.out.args[0].value = &outarg;
138 }
139 ret = fuse_simple_request(fc, &args);
140 if (!ret && !size)
141 ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
142 if (ret > 0 && size)
143 ret = fuse_verify_xattr_list(list, ret);
144 if (ret == -ENOSYS) {
145 fc->no_listxattr = 1;
146 ret = -EOPNOTSUPP;
147 }
148 return ret;
149}
150
151int fuse_removexattr(struct inode *inode, const char *name)
152{
153 struct fuse_conn *fc = get_fuse_conn(inode);
154 FUSE_ARGS(args);
155 int err;
156
157 if (fc->no_removexattr)
158 return -EOPNOTSUPP;
159
160 args.in.h.opcode = FUSE_REMOVEXATTR;
161 args.in.h.nodeid = get_node_id(inode);
162 args.in.numargs = 1;
163 args.in.args[0].size = strlen(name) + 1;
164 args.in.args[0].value = name;
165 err = fuse_simple_request(fc, &args);
166 if (err == -ENOSYS) {
167 fc->no_removexattr = 1;
168 err = -EOPNOTSUPP;
169 }
170 if (!err) {
171 fuse_invalidate_attr(inode);
172 fuse_update_ctime(inode);
173 }
174 return err;
175}
176
177static int fuse_xattr_get(const struct xattr_handler *handler,
178 struct dentry *dentry, struct inode *inode,
179 const char *name, void *value, size_t size)
180{
181 return fuse_getxattr(inode, name, value, size);
182}
183
184static int fuse_xattr_set(const struct xattr_handler *handler,
185 struct dentry *dentry, struct inode *inode,
186 const char *name, const void *value, size_t size,
187 int flags)
188{
189 if (!value)
190 return fuse_removexattr(inode, name);
191
192 return fuse_setxattr(inode, name, value, size, flags);
193}
194
195static const struct xattr_handler fuse_xattr_handler = {
196 .prefix = "",
197 .get = fuse_xattr_get,
198 .set = fuse_xattr_set,
199};
200
201const struct xattr_handler *fuse_xattr_handlers[] = {
202 &fuse_xattr_handler,
203 NULL
204};
205
206const struct xattr_handler *fuse_acl_xattr_handlers[] = {
207 &posix_acl_access_xattr_handler,
208 &posix_acl_default_xattr_handler,
209 &fuse_xattr_handler,
210 NULL
211};
212
