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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 | |
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 | |
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 |
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