Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 3caac46b08b0eeaad1493024d7102c81c2f41661 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
/*
 * FUSE: Filesystem in Userspace
 * Copyright (C) 2001-2016  Miklos Szeredi <miklos@szeredi.hu>
 *
 * This program can be distributed under the terms of the GNU GPL.
 * See the file COPYING.
 */

#include "fuse_i.h"

#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>

int fuse_setxattr(struct inode *inode, const char *name, const void *value,
		  size_t size, int flags)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	struct fuse_setxattr_in inarg;
	int err;

	if (fc->no_setxattr)
		return -EOPNOTSUPP;

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	inarg.flags = flags;
	args.in.h.opcode = FUSE_SETXATTR;
	args.in.h.nodeid = get_node_id(inode);
	args.in.numargs = 3;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	args.in.args[1].size = strlen(name) + 1;
	args.in.args[1].value = name;
	args.in.args[2].size = size;
	args.in.args[2].value = value;
	err = fuse_simple_request(fc, &args);
	if (err == -ENOSYS) {
		fc->no_setxattr = 1;
		err = -EOPNOTSUPP;
	}
	if (!err) {
		fuse_invalidate_attr(inode);
		fuse_update_ctime(inode);
	}
	return err;
}

ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
		      size_t size)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	struct fuse_getxattr_in inarg;
	struct fuse_getxattr_out outarg;
	ssize_t ret;

	if (fc->no_getxattr)
		return -EOPNOTSUPP;

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	args.in.h.opcode = FUSE_GETXATTR;
	args.in.h.nodeid = get_node_id(inode);
	args.in.numargs = 2;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	args.in.args[1].size = strlen(name) + 1;
	args.in.args[1].value = name;
	/* This is really two different operations rolled into one */
	args.out.numargs = 1;
	if (size) {
		args.out.argvar = 1;
		args.out.args[0].size = size;
		args.out.args[0].value = value;
	} else {
		args.out.args[0].size = sizeof(outarg);
		args.out.args[0].value = &outarg;
	}
	ret = fuse_simple_request(fc, &args);
	if (!ret && !size)
		ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
	if (ret == -ENOSYS) {
		fc->no_getxattr = 1;
		ret = -EOPNOTSUPP;
	}
	return ret;
}

static int fuse_verify_xattr_list(char *list, size_t size)
{
	size_t origsize = size;

	while (size) {
		size_t thislen = strnlen(list, size);

		if (!thislen || thislen == size)
			return -EIO;

		size -= thislen + 1;
		list += thislen + 1;
	}

	return origsize;
}

ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
{
	struct inode *inode = d_inode(entry);
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	struct fuse_getxattr_in inarg;
	struct fuse_getxattr_out outarg;
	ssize_t ret;

	if (!fuse_allow_current_process(fc))
		return -EACCES;

	if (fc->no_listxattr)
		return -EOPNOTSUPP;

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	args.in.h.opcode = FUSE_LISTXATTR;
	args.in.h.nodeid = get_node_id(inode);
	args.in.numargs = 1;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	/* This is really two different operations rolled into one */
	args.out.numargs = 1;
	if (size) {
		args.out.argvar = 1;
		args.out.args[0].size = size;
		args.out.args[0].value = list;
	} else {
		args.out.args[0].size = sizeof(outarg);
		args.out.args[0].value = &outarg;
	}
	ret = fuse_simple_request(fc, &args);
	if (!ret && !size)
		ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
	if (ret > 0 && size)
		ret = fuse_verify_xattr_list(list, ret);
	if (ret == -ENOSYS) {
		fc->no_listxattr = 1;
		ret = -EOPNOTSUPP;
	}
	return ret;
}

int fuse_removexattr(struct inode *inode, const char *name)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	int err;

	if (fc->no_removexattr)
		return -EOPNOTSUPP;

	args.in.h.opcode = FUSE_REMOVEXATTR;
	args.in.h.nodeid = get_node_id(inode);
	args.in.numargs = 1;
	args.in.args[0].size = strlen(name) + 1;
	args.in.args[0].value = name;
	err = fuse_simple_request(fc, &args);
	if (err == -ENOSYS) {
		fc->no_removexattr = 1;
		err = -EOPNOTSUPP;
	}
	if (!err) {
		fuse_invalidate_attr(inode);
		fuse_update_ctime(inode);
	}
	return err;
}

static int fuse_xattr_get(const struct xattr_handler *handler,
			 struct dentry *dentry, struct inode *inode,
			 const char *name, void *value, size_t size)
{
	return fuse_getxattr(inode, name, value, size);
}

static int fuse_xattr_set(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, const void *value, size_t size,
			  int flags)
{
	if (!value)
		return fuse_removexattr(inode, name);

	return fuse_setxattr(inode, name, value, size, flags);
}

static const struct xattr_handler fuse_xattr_handler = {
	.prefix = "",
	.get    = fuse_xattr_get,
	.set    = fuse_xattr_set,
};

const struct xattr_handler *fuse_xattr_handlers[] = {
	&fuse_xattr_handler,
	NULL
};

const struct xattr_handler *fuse_acl_xattr_handlers[] = {
	&posix_acl_access_xattr_handler,
	&posix_acl_default_xattr_handler,
	&fuse_xattr_handler,
	NULL
};