1 /*
2 * linux/fs/9p/error.c
3 *
4 * Error string handling
5 *
6 * Plan 9 uses error strings, Unix uses error numbers. These functions
7 * try to help manage that and provide for dynamically adding error
8 * mappings.
9 *
10 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
11 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2
15 * as published by the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to:
24 * Free Software Foundation
25 * 51 Franklin Street, Fifth Floor
26 * Boston, MA 02111-1301 USA
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/list.h>
32 #include <linux/jhash.h>
33 #include <linux/errno.h>
34 #include <net/9p/9p.h>
35
36 /**
37 * struct errormap - map string errors from Plan 9 to Linux numeric ids
38 * @name: string sent over 9P
39 * @val: numeric id most closely representing @name
40 * @namelen: length of string
41 * @list: hash-table list for string lookup
42 */
43 struct errormap {
44 char *name;
45 int val;
46
47 int namelen;
48 struct hlist_node list;
49 };
50
51 #define ERRHASHSZ 32
52 static struct hlist_head hash_errmap[ERRHASHSZ];
53
54 /* FixMe - reduce to a reasonable size */
55 static struct errormap errmap[] = {
56 {"Operation not permitted", EPERM},
57 {"wstat prohibited", EPERM},
58 {"No such file or directory", ENOENT},
59 {"directory entry not found", ENOENT},
60 {"file not found", ENOENT},
61 {"Interrupted system call", EINTR},
62 {"Input/output error", EIO},
63 {"No such device or address", ENXIO},
64 {"Argument list too long", E2BIG},
65 {"Bad file descriptor", EBADF},
66 {"Resource temporarily unavailable", EAGAIN},
67 {"Cannot allocate memory", ENOMEM},
68 {"Permission denied", EACCES},
69 {"Bad address", EFAULT},
70 {"Block device required", ENOTBLK},
71 {"Device or resource busy", EBUSY},
72 {"File exists", EEXIST},
73 {"Invalid cross-device link", EXDEV},
74 {"No such device", ENODEV},
75 {"Not a directory", ENOTDIR},
76 {"Is a directory", EISDIR},
77 {"Invalid argument", EINVAL},
78 {"Too many open files in system", ENFILE},
79 {"Too many open files", EMFILE},
80 {"Text file busy", ETXTBSY},
81 {"File too large", EFBIG},
82 {"No space left on device", ENOSPC},
83 {"Illegal seek", ESPIPE},
84 {"Read-only file system", EROFS},
85 {"Too many links", EMLINK},
86 {"Broken pipe", EPIPE},
87 {"Numerical argument out of domain", EDOM},
88 {"Numerical result out of range", ERANGE},
89 {"Resource deadlock avoided", EDEADLK},
90 {"File name too long", ENAMETOOLONG},
91 {"No locks available", ENOLCK},
92 {"Function not implemented", ENOSYS},
93 {"Directory not empty", ENOTEMPTY},
94 {"Too many levels of symbolic links", ELOOP},
95 {"No message of desired type", ENOMSG},
96 {"Identifier removed", EIDRM},
97 {"No data available", ENODATA},
98 {"Machine is not on the network", ENONET},
99 {"Package not installed", ENOPKG},
100 {"Object is remote", EREMOTE},
101 {"Link has been severed", ENOLINK},
102 {"Communication error on send", ECOMM},
103 {"Protocol error", EPROTO},
104 {"Bad message", EBADMSG},
105 {"File descriptor in bad state", EBADFD},
106 {"Streams pipe error", ESTRPIPE},
107 {"Too many users", EUSERS},
108 {"Socket operation on non-socket", ENOTSOCK},
109 {"Message too long", EMSGSIZE},
110 {"Protocol not available", ENOPROTOOPT},
111 {"Protocol not supported", EPROTONOSUPPORT},
112 {"Socket type not supported", ESOCKTNOSUPPORT},
113 {"Operation not supported", EOPNOTSUPP},
114 {"Protocol family not supported", EPFNOSUPPORT},
115 {"Network is down", ENETDOWN},
116 {"Network is unreachable", ENETUNREACH},
117 {"Network dropped connection on reset", ENETRESET},
118 {"Software caused connection abort", ECONNABORTED},
119 {"Connection reset by peer", ECONNRESET},
120 {"No buffer space available", ENOBUFS},
121 {"Transport endpoint is already connected", EISCONN},
122 {"Transport endpoint is not connected", ENOTCONN},
123 {"Cannot send after transport endpoint shutdown", ESHUTDOWN},
124 {"Connection timed out", ETIMEDOUT},
125 {"Connection refused", ECONNREFUSED},
126 {"Host is down", EHOSTDOWN},
127 {"No route to host", EHOSTUNREACH},
128 {"Operation already in progress", EALREADY},
129 {"Operation now in progress", EINPROGRESS},
130 {"Is a named type file", EISNAM},
131 {"Remote I/O error", EREMOTEIO},
132 {"Disk quota exceeded", EDQUOT},
133 /* errors from fossil, vacfs, and u9fs */
134 {"fid unknown or out of range", EBADF},
135 {"permission denied", EACCES},
136 {"file does not exist", ENOENT},
137 {"authentication failed", ECONNREFUSED},
138 {"bad offset in directory read", ESPIPE},
139 {"bad use of fid", EBADF},
140 {"wstat can't convert between files and directories", EPERM},
141 {"directory is not empty", ENOTEMPTY},
142 {"file exists", EEXIST},
143 {"file already exists", EEXIST},
144 {"file or directory already exists", EEXIST},
145 {"fid already in use", EBADF},
146 {"file in use", ETXTBSY},
147 {"i/o error", EIO},
148 {"file already open for I/O", ETXTBSY},
149 {"illegal mode", EINVAL},
150 {"illegal name", ENAMETOOLONG},
151 {"not a directory", ENOTDIR},
152 {"not a member of proposed group", EPERM},
153 {"not owner", EACCES},
154 {"only owner can change group in wstat", EACCES},
155 {"read only file system", EROFS},
156 {"no access to special file", EPERM},
157 {"i/o count too large", EIO},
158 {"unknown group", EINVAL},
159 {"unknown user", EINVAL},
160 {"bogus wstat buffer", EPROTO},
161 {"exclusive use file already open", EAGAIN},
162 {"corrupted directory entry", EIO},
163 {"corrupted file entry", EIO},
164 {"corrupted block label", EIO},
165 {"corrupted meta data", EIO},
166 {"illegal offset", EINVAL},
167 {"illegal path element", ENOENT},
168 {"root of file system is corrupted", EIO},
169 {"corrupted super block", EIO},
170 {"protocol botch", EPROTO},
171 {"file system is full", ENOSPC},
172 {"file is in use", EAGAIN},
173 {"directory entry is not allocated", ENOENT},
174 {"file is read only", EROFS},
175 {"file has been removed", EIDRM},
176 {"only support truncation to zero length", EPERM},
177 {"cannot remove root", EPERM},
178 {"file too big", EFBIG},
179 {"venti i/o error", EIO},
180 /* these are not errors */
181 {"u9fs rhostsauth: no authentication required", 0},
182 {"u9fs authnone: no authentication required", 0},
183 {NULL, -1}
184 };
185
186 /**
187 * p9_error_init - preload mappings into hash list
188 *
189 */
190
p9_error_init(void)191 int p9_error_init(void)
192 {
193 struct errormap *c;
194 int bucket;
195
196 /* initialize hash table */
197 for (bucket = 0; bucket < ERRHASHSZ; bucket++)
198 INIT_HLIST_HEAD(&hash_errmap[bucket]);
199
200 /* load initial error map into hash table */
201 for (c = errmap; c->name != NULL; c++) {
202 c->namelen = strlen(c->name);
203 bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
204 INIT_HLIST_NODE(&c->list);
205 hlist_add_head(&c->list, &hash_errmap[bucket]);
206 }
207
208 return 1;
209 }
210 EXPORT_SYMBOL(p9_error_init);
211
212 /**
213 * errstr2errno - convert error string to error number
214 * @errstr: error string
215 * @len: length of error string
216 *
217 */
218
p9_errstr2errno(char * errstr,int len)219 int p9_errstr2errno(char *errstr, int len)
220 {
221 int errno;
222 struct hlist_node *p;
223 struct errormap *c;
224 int bucket;
225
226 errno = 0;
227 p = NULL;
228 c = NULL;
229 bucket = jhash(errstr, len, 0) % ERRHASHSZ;
230 hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
231 if (c->namelen == len && !memcmp(c->name, errstr, len)) {
232 errno = c->val;
233 break;
234 }
235 }
236
237 if (errno == 0) {
238 /* TODO: if error isn't found, add it dynamically */
239 errstr[len] = 0;
240 printk(KERN_ERR "%s: server reported unknown error %s\n",
241 __func__, errstr);
242 errno = ESERVERFAULT;
243 }
244
245 return -errno;
246 }
247 EXPORT_SYMBOL(p9_errstr2errno);
248