1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Error string handling
4 *
5 * Plan 9 uses error strings, Unix uses error numbers. These functions
6 * try to help manage that and provide for dynamically adding error
7 * mappings.
8 *
9 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
10 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/list.h>
17 #include <linux/jhash.h>
18 #include <linux/errno.h>
19 #include <net/9p/9p.h>
20
21 /**
22 * struct errormap - map string errors from Plan 9 to Linux numeric ids
23 * @name: string sent over 9P
24 * @val: numeric id most closely representing @name
25 * @namelen: length of string
26 * @list: hash-table list for string lookup
27 */
28 struct errormap {
29 char *name;
30 int val;
31
32 int namelen;
33 struct hlist_node list;
34 };
35
36 #define ERRHASHSZ 32
37 static struct hlist_head hash_errmap[ERRHASHSZ];
38
39 /* FixMe - reduce to a reasonable size */
40 static struct errormap errmap[] = {
41 {"Operation not permitted", EPERM},
42 {"wstat prohibited", EPERM},
43 {"No such file or directory", ENOENT},
44 {"directory entry not found", ENOENT},
45 {"file not found", ENOENT},
46 {"Interrupted system call", EINTR},
47 {"Input/output error", EIO},
48 {"No such device or address", ENXIO},
49 {"Argument list too long", E2BIG},
50 {"Bad file descriptor", EBADF},
51 {"Resource temporarily unavailable", EAGAIN},
52 {"Cannot allocate memory", ENOMEM},
53 {"Permission denied", EACCES},
54 {"Bad address", EFAULT},
55 {"Block device required", ENOTBLK},
56 {"Device or resource busy", EBUSY},
57 {"File exists", EEXIST},
58 {"Invalid cross-device link", EXDEV},
59 {"No such device", ENODEV},
60 {"Not a directory", ENOTDIR},
61 {"Is a directory", EISDIR},
62 {"Invalid argument", EINVAL},
63 {"Too many open files in system", ENFILE},
64 {"Too many open files", EMFILE},
65 {"Text file busy", ETXTBSY},
66 {"File too large", EFBIG},
67 {"No space left on device", ENOSPC},
68 {"Illegal seek", ESPIPE},
69 {"Read-only file system", EROFS},
70 {"Too many links", EMLINK},
71 {"Broken pipe", EPIPE},
72 {"Numerical argument out of domain", EDOM},
73 {"Numerical result out of range", ERANGE},
74 {"Resource deadlock avoided", EDEADLK},
75 {"File name too long", ENAMETOOLONG},
76 {"No locks available", ENOLCK},
77 {"Function not implemented", ENOSYS},
78 {"Directory not empty", ENOTEMPTY},
79 {"Too many levels of symbolic links", ELOOP},
80 {"No message of desired type", ENOMSG},
81 {"Identifier removed", EIDRM},
82 {"No data available", ENODATA},
83 {"Machine is not on the network", ENONET},
84 {"Package not installed", ENOPKG},
85 {"Object is remote", EREMOTE},
86 {"Link has been severed", ENOLINK},
87 {"Communication error on send", ECOMM},
88 {"Protocol error", EPROTO},
89 {"Bad message", EBADMSG},
90 {"File descriptor in bad state", EBADFD},
91 {"Streams pipe error", ESTRPIPE},
92 {"Too many users", EUSERS},
93 {"Socket operation on non-socket", ENOTSOCK},
94 {"Message too long", EMSGSIZE},
95 {"Protocol not available", ENOPROTOOPT},
96 {"Protocol not supported", EPROTONOSUPPORT},
97 {"Socket type not supported", ESOCKTNOSUPPORT},
98 {"Operation not supported", EOPNOTSUPP},
99 {"Protocol family not supported", EPFNOSUPPORT},
100 {"Network is down", ENETDOWN},
101 {"Network is unreachable", ENETUNREACH},
102 {"Network dropped connection on reset", ENETRESET},
103 {"Software caused connection abort", ECONNABORTED},
104 {"Connection reset by peer", ECONNRESET},
105 {"No buffer space available", ENOBUFS},
106 {"Transport endpoint is already connected", EISCONN},
107 {"Transport endpoint is not connected", ENOTCONN},
108 {"Cannot send after transport endpoint shutdown", ESHUTDOWN},
109 {"Connection timed out", ETIMEDOUT},
110 {"Connection refused", ECONNREFUSED},
111 {"Host is down", EHOSTDOWN},
112 {"No route to host", EHOSTUNREACH},
113 {"Operation already in progress", EALREADY},
114 {"Operation now in progress", EINPROGRESS},
115 {"Is a named type file", EISNAM},
116 {"Remote I/O error", EREMOTEIO},
117 {"Disk quota exceeded", EDQUOT},
118 /* errors from fossil, vacfs, and u9fs */
119 {"fid unknown or out of range", EBADF},
120 {"permission denied", EACCES},
121 {"file does not exist", ENOENT},
122 {"authentication failed", ECONNREFUSED},
123 {"bad offset in directory read", ESPIPE},
124 {"bad use of fid", EBADF},
125 {"wstat can't convert between files and directories", EPERM},
126 {"directory is not empty", ENOTEMPTY},
127 {"file exists", EEXIST},
128 {"file already exists", EEXIST},
129 {"file or directory already exists", EEXIST},
130 {"fid already in use", EBADF},
131 {"file in use", ETXTBSY},
132 {"i/o error", EIO},
133 {"file already open for I/O", ETXTBSY},
134 {"illegal mode", EINVAL},
135 {"illegal name", ENAMETOOLONG},
136 {"not a directory", ENOTDIR},
137 {"not a member of proposed group", EPERM},
138 {"not owner", EACCES},
139 {"only owner can change group in wstat", EACCES},
140 {"read only file system", EROFS},
141 {"no access to special file", EPERM},
142 {"i/o count too large", EIO},
143 {"unknown group", EINVAL},
144 {"unknown user", EINVAL},
145 {"bogus wstat buffer", EPROTO},
146 {"exclusive use file already open", EAGAIN},
147 {"corrupted directory entry", EIO},
148 {"corrupted file entry", EIO},
149 {"corrupted block label", EIO},
150 {"corrupted meta data", EIO},
151 {"illegal offset", EINVAL},
152 {"illegal path element", ENOENT},
153 {"root of file system is corrupted", EIO},
154 {"corrupted super block", EIO},
155 {"protocol botch", EPROTO},
156 {"file system is full", ENOSPC},
157 {"file is in use", EAGAIN},
158 {"directory entry is not allocated", ENOENT},
159 {"file is read only", EROFS},
160 {"file has been removed", EIDRM},
161 {"only support truncation to zero length", EPERM},
162 {"cannot remove root", EPERM},
163 {"file too big", EFBIG},
164 {"venti i/o error", EIO},
165 /* these are not errors */
166 {"u9fs rhostsauth: no authentication required", 0},
167 {"u9fs authnone: no authentication required", 0},
168 {NULL, -1}
169 };
170
171 /**
172 * p9_error_init - preload mappings into hash list
173 *
174 */
175
176 int p9_error_init(void)
177 {
178 struct errormap *c;
179 int bucket;
180
181 /* initialize hash table */
182 for (bucket = 0; bucket < ERRHASHSZ; bucket++)
183 INIT_HLIST_HEAD(&hash_errmap[bucket]);
184
185 /* load initial error map into hash table */
186 for (c = errmap; c->name; c++) {
187 c->namelen = strlen(c->name);
188 bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
189 INIT_HLIST_NODE(&c->list);
190 hlist_add_head(&c->list, &hash_errmap[bucket]);
191 }
192
193 return 1;
194 }
195 EXPORT_SYMBOL(p9_error_init);
196
197 /**
198 * p9_errstr2errno - convert error string to error number
199 * @errstr: error string
200 * @len: length of error string
201 *
202 */
203
204 int p9_errstr2errno(char *errstr, int len)
205 {
206 int errno;
207 struct errormap *c;
208 int bucket;
209
210 errno = 0;
211 c = NULL;
212 bucket = jhash(errstr, len, 0) % ERRHASHSZ;
213 hlist_for_each_entry(c, &hash_errmap[bucket], list) {
214 if (c->namelen == len && !memcmp(c->name, errstr, len)) {
215 errno = c->val;
216 break;
217 }
218 }
219
220 if (errno == 0) {
221 /* TODO: if error isn't found, add it dynamically */
222 errstr[len] = 0;
223 pr_err("%s: server reported unknown error %s\n",
224 __func__, errstr);
225 errno = ESERVERFAULT;
226 }
227
228 return -errno;
229 }
230 EXPORT_SYMBOL(p9_errstr2errno);
231
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