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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, &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)
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}
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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 int ret;
75
76 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
77 name, buffer_size);
78 fid = v9fs_fid_lookup(dentry);
79 if (IS_ERR(fid))
80 return PTR_ERR(fid);
81 ret = v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
82 p9_client_clunk(fid);
83
84 return ret;
85}
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98
99int v9fs_xattr_set(struct dentry *dentry, const char *name,
100 const void *value, size_t value_len, int flags)
101{
102 int ret;
103 struct p9_fid *fid;
104
105 fid = v9fs_fid_lookup(dentry);
106 if (IS_ERR(fid))
107 return PTR_ERR(fid);
108 ret = v9fs_fid_xattr_set(fid, name, value, value_len, flags);
109 p9_client_clunk(fid);
110 return ret;
111}
112
113int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
114 const void *value, size_t value_len, int flags)
115{
116 struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
117 struct iov_iter from;
118 int retval, err;
119
120 iov_iter_kvec(&from, WRITE, &kvec, 1, value_len);
121
122 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
123 name, value_len, flags);
124
125
126 fid = clone_fid(fid);
127 if (IS_ERR(fid))
128 return PTR_ERR(fid);
129
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132
133 retval = p9_client_xattrcreate(fid, name, value_len, flags);
134 if (retval < 0)
135 p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
136 retval);
137 else
138 p9_client_write(fid, 0, &from, &retval);
139 err = p9_client_clunk(fid);
140 if (!retval && err)
141 retval = err;
142 return retval;
143}
144
145ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
146{
147 return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
148}
149
150static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
151 struct dentry *dentry, struct inode *inode,
152 const char *name, void *buffer, size_t size)
153{
154 const char *full_name = xattr_full_name(handler, name);
155
156 return v9fs_xattr_get(dentry, full_name, buffer, size);
157}
158
159static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
160 struct user_namespace *mnt_userns,
161 struct dentry *dentry, struct inode *inode,
162 const char *name, const void *value,
163 size_t size, int flags)
164{
165 const char *full_name = xattr_full_name(handler, name);
166
167 return v9fs_xattr_set(dentry, full_name, value, size, flags);
168}
169
170static struct xattr_handler v9fs_xattr_user_handler = {
171 .prefix = XATTR_USER_PREFIX,
172 .get = v9fs_xattr_handler_get,
173 .set = v9fs_xattr_handler_set,
174};
175
176static struct xattr_handler v9fs_xattr_trusted_handler = {
177 .prefix = XATTR_TRUSTED_PREFIX,
178 .get = v9fs_xattr_handler_get,
179 .set = v9fs_xattr_handler_set,
180};
181
182#ifdef CONFIG_9P_FS_SECURITY
183static struct xattr_handler v9fs_xattr_security_handler = {
184 .prefix = XATTR_SECURITY_PREFIX,
185 .get = v9fs_xattr_handler_get,
186 .set = v9fs_xattr_handler_set,
187};
188#endif
189
190const struct xattr_handler *v9fs_xattr_handlers[] = {
191 &v9fs_xattr_user_handler,
192 &v9fs_xattr_trusted_handler,
193#ifdef CONFIG_9P_FS_POSIX_ACL
194 &v9fs_xattr_acl_access_handler,
195 &v9fs_xattr_acl_default_handler,
196#endif
197#ifdef CONFIG_9P_FS_SECURITY
198 &v9fs_xattr_security_handler,
199#endif
200 NULL
201};
202