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1/*
2 * Copyright IBM Corporation, 2010
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 */
14
15#include <linux/module.h>
16#include <linux/fs.h>
17#include <linux/sched.h>
18#include <linux/uio.h>
19#include <net/9p/9p.h>
20#include <net/9p/client.h>
21
22#include "fid.h"
23#include "xattr.h"
24
25ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
26 void *buffer, size_t buffer_size)
27{
28 ssize_t retval;
29 u64 attr_size;
30 struct p9_fid *attr_fid;
31 struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
32 struct iov_iter to;
33 int err;
34
35 iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buffer_size);
36
37 attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
38 if (IS_ERR(attr_fid)) {
39 retval = PTR_ERR(attr_fid);
40 p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
41 retval);
42 return retval;
43 }
44 if (attr_size > buffer_size) {
45 if (!buffer_size) /* request to get the attr_size */
46 retval = attr_size;
47 else
48 retval = -ERANGE;
49 } else {
50 iov_iter_truncate(&to, attr_size);
51 retval = p9_client_read(attr_fid, 0, &to, &err);
52 if (err)
53 retval = err;
54 }
55 p9_client_clunk(attr_fid);
56 return retval;
57}
58
59
60/*
61 * v9fs_xattr_get()
62 *
63 * Copy an extended attribute into the buffer
64 * provided, or compute the buffer size required.
65 * Buffer is NULL to compute the size of the buffer required.
66 *
67 * Returns a negative error number on failure, or the number of bytes
68 * used / required on success.
69 */
70ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
71 void *buffer, size_t buffer_size)
72{
73 struct p9_fid *fid;
74
75 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
76 name, buffer_size);
77 fid = v9fs_fid_lookup(dentry);
78 if (IS_ERR(fid))
79 return PTR_ERR(fid);
80
81 return v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
82}
83
84/*
85 * v9fs_xattr_set()
86 *
87 * Create, replace or remove an extended attribute for this inode. Buffer
88 * is NULL to remove an existing extended attribute, and non-NULL to
89 * either replace an existing extended attribute, or create a new extended
90 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
91 * specify that an extended attribute must exist and must not exist
92 * previous to the call, respectively.
93 *
94 * Returns 0, or a negative error number on failure.
95 */
96int v9fs_xattr_set(struct dentry *dentry, const char *name,
97 const void *value, size_t value_len, int flags)
98{
99 struct p9_fid *fid = v9fs_fid_lookup(dentry);
100 return v9fs_fid_xattr_set(fid, name, value, value_len, flags);
101}
102
103int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
104 const void *value, size_t value_len, int flags)
105{
106 struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
107 struct iov_iter from;
108 int retval;
109
110 iov_iter_kvec(&from, WRITE | ITER_KVEC, &kvec, 1, value_len);
111
112 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
113 name, value_len, flags);
114
115 /* Clone it */
116 fid = clone_fid(fid);
117 if (IS_ERR(fid))
118 return PTR_ERR(fid);
119
120 /*
121 * On success fid points to xattr
122 */
123 retval = p9_client_xattrcreate(fid, name, value_len, flags);
124 if (retval < 0)
125 p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
126 retval);
127 else
128 p9_client_write(fid, 0, &from, &retval);
129 p9_client_clunk(fid);
130 return retval;
131}
132
133ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
134{
135 return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
136}
137
138static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
139 struct dentry *dentry, struct inode *inode,
140 const char *name, void *buffer, size_t size)
141{
142 const char *full_name = xattr_full_name(handler, name);
143
144 return v9fs_xattr_get(dentry, full_name, buffer, size);
145}
146
147static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
148 struct dentry *dentry, struct inode *inode,
149 const char *name, const void *value,
150 size_t size, int flags)
151{
152 const char *full_name = xattr_full_name(handler, name);
153
154 return v9fs_xattr_set(dentry, full_name, value, size, flags);
155}
156
157static struct xattr_handler v9fs_xattr_user_handler = {
158 .prefix = XATTR_USER_PREFIX,
159 .get = v9fs_xattr_handler_get,
160 .set = v9fs_xattr_handler_set,
161};
162
163static struct xattr_handler v9fs_xattr_trusted_handler = {
164 .prefix = XATTR_TRUSTED_PREFIX,
165 .get = v9fs_xattr_handler_get,
166 .set = v9fs_xattr_handler_set,
167};
168
169#ifdef CONFIG_9P_FS_SECURITY
170static struct xattr_handler v9fs_xattr_security_handler = {
171 .prefix = XATTR_SECURITY_PREFIX,
172 .get = v9fs_xattr_handler_get,
173 .set = v9fs_xattr_handler_set,
174};
175#endif
176
177const struct xattr_handler *v9fs_xattr_handlers[] = {
178 &v9fs_xattr_user_handler,
179 &v9fs_xattr_trusted_handler,
180#ifdef CONFIG_9P_FS_POSIX_ACL
181 &v9fs_xattr_acl_access_handler,
182 &v9fs_xattr_acl_default_handler,
183#endif
184#ifdef CONFIG_9P_FS_SECURITY
185 &v9fs_xattr_security_handler,
186#endif
187 NULL
188};
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * Copyright IBM Corporation, 2010
4 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
5 */
6
7#include <linux/module.h>
8#include <linux/fs.h>
9#include <linux/sched.h>
10#include <linux/uio.h>
11#include <linux/posix_acl_xattr.h>
12#include <net/9p/9p.h>
13#include <net/9p/client.h>
14
15#include "fid.h"
16#include "xattr.h"
17
18ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
19 void *buffer, size_t buffer_size)
20{
21 ssize_t retval;
22 u64 attr_size;
23 struct p9_fid *attr_fid;
24 struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
25 struct iov_iter to;
26 int err;
27
28 iov_iter_kvec(&to, ITER_DEST, &kvec, 1, buffer_size);
29
30 attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
31 if (IS_ERR(attr_fid)) {
32 retval = PTR_ERR(attr_fid);
33 p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
34 retval);
35 return retval;
36 }
37 if (attr_size > buffer_size) {
38 if (!buffer_size) /* request to get the attr_size */
39 retval = attr_size;
40 else
41 retval = -ERANGE;
42 } else {
43 iov_iter_truncate(&to, attr_size);
44 retval = p9_client_read(attr_fid, 0, &to, &err);
45 if (err)
46 retval = err;
47 }
48 p9_fid_put(attr_fid);
49 return retval;
50}
51
52
53/*
54 * v9fs_xattr_get()
55 *
56 * Copy an extended attribute into the buffer
57 * provided, or compute the buffer size required.
58 * Buffer is NULL to compute the size of the buffer required.
59 *
60 * Returns a negative error number on failure, or the number of bytes
61 * used / required on success.
62 */
63ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
64 void *buffer, size_t buffer_size)
65{
66 struct p9_fid *fid;
67 int ret;
68
69 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
70 name, buffer_size);
71 fid = v9fs_fid_lookup(dentry);
72 if (IS_ERR(fid))
73 return PTR_ERR(fid);
74 ret = v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
75 p9_fid_put(fid);
76
77 return ret;
78}
79
80/*
81 * v9fs_xattr_set()
82 *
83 * Create, replace or remove an extended attribute for this inode. Buffer
84 * is NULL to remove an existing extended attribute, and non-NULL to
85 * either replace an existing extended attribute, or create a new extended
86 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
87 * specify that an extended attribute must exist and must not exist
88 * previous to the call, respectively.
89 *
90 * Returns 0, or a negative error number on failure.
91 */
92int v9fs_xattr_set(struct dentry *dentry, const char *name,
93 const void *value, size_t value_len, int flags)
94{
95 int ret;
96 struct p9_fid *fid;
97
98 fid = v9fs_fid_lookup(dentry);
99 if (IS_ERR(fid))
100 return PTR_ERR(fid);
101 ret = v9fs_fid_xattr_set(fid, name, value, value_len, flags);
102 p9_fid_put(fid);
103 return ret;
104}
105
106int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
107 const void *value, size_t value_len, int flags)
108{
109 struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
110 struct iov_iter from;
111 int retval, err;
112
113 iov_iter_kvec(&from, ITER_SOURCE, &kvec, 1, value_len);
114
115 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
116 name, value_len, flags);
117
118 /* Clone it */
119 fid = clone_fid(fid);
120 if (IS_ERR(fid))
121 return PTR_ERR(fid);
122
123 /*
124 * On success fid points to xattr
125 */
126 retval = p9_client_xattrcreate(fid, name, value_len, flags);
127 if (retval < 0)
128 p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
129 retval);
130 else
131 p9_client_write(fid, 0, &from, &retval);
132 err = p9_fid_put(fid);
133 if (!retval && err)
134 retval = err;
135 return retval;
136}
137
138ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
139{
140 return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
141}
142
143static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
144 struct dentry *dentry, struct inode *inode,
145 const char *name, void *buffer, size_t size)
146{
147 const char *full_name = xattr_full_name(handler, name);
148
149 return v9fs_xattr_get(dentry, full_name, buffer, size);
150}
151
152static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
153 struct user_namespace *mnt_userns,
154 struct dentry *dentry, struct inode *inode,
155 const char *name, const void *value,
156 size_t size, int flags)
157{
158 const char *full_name = xattr_full_name(handler, name);
159
160 return v9fs_xattr_set(dentry, full_name, value, size, flags);
161}
162
163static struct xattr_handler v9fs_xattr_user_handler = {
164 .prefix = XATTR_USER_PREFIX,
165 .get = v9fs_xattr_handler_get,
166 .set = v9fs_xattr_handler_set,
167};
168
169static struct xattr_handler v9fs_xattr_trusted_handler = {
170 .prefix = XATTR_TRUSTED_PREFIX,
171 .get = v9fs_xattr_handler_get,
172 .set = v9fs_xattr_handler_set,
173};
174
175#ifdef CONFIG_9P_FS_SECURITY
176static struct xattr_handler v9fs_xattr_security_handler = {
177 .prefix = XATTR_SECURITY_PREFIX,
178 .get = v9fs_xattr_handler_get,
179 .set = v9fs_xattr_handler_set,
180};
181#endif
182
183const struct xattr_handler *v9fs_xattr_handlers[] = {
184 &v9fs_xattr_user_handler,
185 &v9fs_xattr_trusted_handler,
186#ifdef CONFIG_FS_POSIX_ACL
187 &posix_acl_access_xattr_handler,
188 &posix_acl_default_xattr_handler,
189#endif
190#ifdef CONFIG_9P_FS_SECURITY
191 &v9fs_xattr_security_handler,
192#endif
193 NULL
194};