2 * FUSE: Filesystem in Userspace
3 * Copyright (C) 2001-2016 Miklos Szeredi <miklos@szeredi.hu>
5 * This program can be distributed under the terms of the GNU GPL.
6 * See the file COPYING.
11 #include <linux/xattr.h>
12 #include <linux/posix_acl_xattr.h>
14 int fuse_setxattr(struct inode *inode, const char *name, const void *value,
15 size_t size, int flags)
17 struct fuse_conn *fc = get_fuse_conn(inode);
19 struct fuse_setxattr_in inarg;
25 memset(&inarg, 0, sizeof(inarg));
28 args.in.h.opcode = FUSE_SETXATTR;
29 args.in.h.nodeid = get_node_id(inode);
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);
43 fuse_invalidate_attr(inode);
44 fuse_update_ctime(inode);
49 ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
52 struct fuse_conn *fc = get_fuse_conn(inode);
54 struct fuse_getxattr_in inarg;
55 struct fuse_getxattr_out outarg;
61 memset(&inarg, 0, sizeof(inarg));
63 args.in.h.opcode = FUSE_GETXATTR;
64 args.in.h.nodeid = get_node_id(inode);
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 /* This is really two different operations rolled into one */
74 args.out.args[0].size = size;
75 args.out.args[0].value = value;
77 args.out.args[0].size = sizeof(outarg);
78 args.out.args[0].value = &outarg;
80 ret = fuse_simple_request(fc, &args);
82 ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
90 static int fuse_verify_xattr_list(char *list, size_t size)
92 size_t origsize = size;
95 size_t thislen = strnlen(list, size);
97 if (!thislen || thislen == size)
107 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
109 struct inode *inode = d_inode(entry);
110 struct fuse_conn *fc = get_fuse_conn(inode);
112 struct fuse_getxattr_in inarg;
113 struct fuse_getxattr_out outarg;
116 if (fuse_is_bad(inode))
119 if (!fuse_allow_current_process(fc))
122 if (fc->no_listxattr)
125 memset(&inarg, 0, sizeof(inarg));
127 args.in.h.opcode = FUSE_LISTXATTR;
128 args.in.h.nodeid = get_node_id(inode);
130 args.in.args[0].size = sizeof(inarg);
131 args.in.args[0].value = &inarg;
132 /* This is really two different operations rolled into one */
133 args.out.numargs = 1;
136 args.out.args[0].size = size;
137 args.out.args[0].value = list;
139 args.out.args[0].size = sizeof(outarg);
140 args.out.args[0].value = &outarg;
142 ret = fuse_simple_request(fc, &args);
144 ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
146 ret = fuse_verify_xattr_list(list, ret);
147 if (ret == -ENOSYS) {
148 fc->no_listxattr = 1;
154 int fuse_removexattr(struct inode *inode, const char *name)
156 struct fuse_conn *fc = get_fuse_conn(inode);
160 if (fc->no_removexattr)
163 args.in.h.opcode = FUSE_REMOVEXATTR;
164 args.in.h.nodeid = get_node_id(inode);
166 args.in.args[0].size = strlen(name) + 1;
167 args.in.args[0].value = name;
168 err = fuse_simple_request(fc, &args);
169 if (err == -ENOSYS) {
170 fc->no_removexattr = 1;
174 fuse_invalidate_attr(inode);
175 fuse_update_ctime(inode);
180 static int fuse_xattr_get(const struct xattr_handler *handler,
181 struct dentry *dentry, struct inode *inode,
182 const char *name, void *value, size_t size)
184 if (fuse_is_bad(inode))
187 return fuse_getxattr(inode, name, value, size);
190 static int fuse_xattr_set(const struct xattr_handler *handler,
191 struct dentry *dentry, struct inode *inode,
192 const char *name, const void *value, size_t size,
195 if (fuse_is_bad(inode))
199 return fuse_removexattr(inode, name);
201 return fuse_setxattr(inode, name, value, size, flags);
204 static bool no_xattr_list(struct dentry *dentry)
209 static int no_xattr_get(const struct xattr_handler *handler,
210 struct dentry *dentry, struct inode *inode,
211 const char *name, void *value, size_t size)
216 static int no_xattr_set(const struct xattr_handler *handler,
217 struct dentry *dentry, struct inode *nodee,
218 const char *name, const void *value,
219 size_t size, int flags)
224 static const struct xattr_handler fuse_xattr_handler = {
226 .get = fuse_xattr_get,
227 .set = fuse_xattr_set,
230 const struct xattr_handler *fuse_xattr_handlers[] = {
235 const struct xattr_handler *fuse_acl_xattr_handlers[] = {
236 &posix_acl_access_xattr_handler,
237 &posix_acl_default_xattr_handler,
242 static const struct xattr_handler fuse_no_acl_access_xattr_handler = {
243 .name = XATTR_NAME_POSIX_ACL_ACCESS,
244 .flags = ACL_TYPE_ACCESS,
245 .list = no_xattr_list,
250 static const struct xattr_handler fuse_no_acl_default_xattr_handler = {
251 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
252 .flags = ACL_TYPE_ACCESS,
253 .list = no_xattr_list,
258 const struct xattr_handler *fuse_no_acl_xattr_handlers[] = {
259 &fuse_no_acl_access_xattr_handler,
260 &fuse_no_acl_default_xattr_handler,