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1 : : // SPDX-License-Identifier: GPL-2.0-only
2 : : /*
3 : : * linux/fs/9p/error.c
4 : : *
5 : : * Error string handling
6 : : *
7 : : * Plan 9 uses error strings, Unix uses error numbers. These functions
8 : : * try to help manage that and provide for dynamically adding error
9 : : * mappings.
10 : : *
11 : : * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
12 : : * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
13 : : */
14 : :
15 : : #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 : :
17 : : #include <linux/module.h>
18 : : #include <linux/list.h>
19 : : #include <linux/jhash.h>
20 : : #include <linux/errno.h>
21 : : #include <net/9p/9p.h>
22 : :
23 : : /**
24 : : * struct errormap - map string errors from Plan 9 to Linux numeric ids
25 : : * @name: string sent over 9P
26 : : * @val: numeric id most closely representing @name
27 : : * @namelen: length of string
28 : : * @list: hash-table list for string lookup
29 : : */
30 : : struct errormap {
31 : : char *name;
32 : : int val;
33 : :
34 : : int namelen;
35 : : struct hlist_node list;
36 : : };
37 : :
38 : : #define ERRHASHSZ 32
39 : : static struct hlist_head hash_errmap[ERRHASHSZ];
40 : :
41 : : /* FixMe - reduce to a reasonable size */
42 : : static struct errormap errmap[] = {
43 : : {"Operation not permitted", EPERM},
44 : : {"wstat prohibited", EPERM},
45 : : {"No such file or directory", ENOENT},
46 : : {"directory entry not found", ENOENT},
47 : : {"file not found", ENOENT},
48 : : {"Interrupted system call", EINTR},
49 : : {"Input/output error", EIO},
50 : : {"No such device or address", ENXIO},
51 : : {"Argument list too long", E2BIG},
52 : : {"Bad file descriptor", EBADF},
53 : : {"Resource temporarily unavailable", EAGAIN},
54 : : {"Cannot allocate memory", ENOMEM},
55 : : {"Permission denied", EACCES},
56 : : {"Bad address", EFAULT},
57 : : {"Block device required", ENOTBLK},
58 : : {"Device or resource busy", EBUSY},
59 : : {"File exists", EEXIST},
60 : : {"Invalid cross-device link", EXDEV},
61 : : {"No such device", ENODEV},
62 : : {"Not a directory", ENOTDIR},
63 : : {"Is a directory", EISDIR},
64 : : {"Invalid argument", EINVAL},
65 : : {"Too many open files in system", ENFILE},
66 : : {"Too many open files", EMFILE},
67 : : {"Text file busy", ETXTBSY},
68 : : {"File too large", EFBIG},
69 : : {"No space left on device", ENOSPC},
70 : : {"Illegal seek", ESPIPE},
71 : : {"Read-only file system", EROFS},
72 : : {"Too many links", EMLINK},
73 : : {"Broken pipe", EPIPE},
74 : : {"Numerical argument out of domain", EDOM},
75 : : {"Numerical result out of range", ERANGE},
76 : : {"Resource deadlock avoided", EDEADLK},
77 : : {"File name too long", ENAMETOOLONG},
78 : : {"No locks available", ENOLCK},
79 : : {"Function not implemented", ENOSYS},
80 : : {"Directory not empty", ENOTEMPTY},
81 : : {"Too many levels of symbolic links", ELOOP},
82 : : {"No message of desired type", ENOMSG},
83 : : {"Identifier removed", EIDRM},
84 : : {"No data available", ENODATA},
85 : : {"Machine is not on the network", ENONET},
86 : : {"Package not installed", ENOPKG},
87 : : {"Object is remote", EREMOTE},
88 : : {"Link has been severed", ENOLINK},
89 : : {"Communication error on send", ECOMM},
90 : : {"Protocol error", EPROTO},
91 : : {"Bad message", EBADMSG},
92 : : {"File descriptor in bad state", EBADFD},
93 : : {"Streams pipe error", ESTRPIPE},
94 : : {"Too many users", EUSERS},
95 : : {"Socket operation on non-socket", ENOTSOCK},
96 : : {"Message too long", EMSGSIZE},
97 : : {"Protocol not available", ENOPROTOOPT},
98 : : {"Protocol not supported", EPROTONOSUPPORT},
99 : : {"Socket type not supported", ESOCKTNOSUPPORT},
100 : : {"Operation not supported", EOPNOTSUPP},
101 : : {"Protocol family not supported", EPFNOSUPPORT},
102 : : {"Network is down", ENETDOWN},
103 : : {"Network is unreachable", ENETUNREACH},
104 : : {"Network dropped connection on reset", ENETRESET},
105 : : {"Software caused connection abort", ECONNABORTED},
106 : : {"Connection reset by peer", ECONNRESET},
107 : : {"No buffer space available", ENOBUFS},
108 : : {"Transport endpoint is already connected", EISCONN},
109 : : {"Transport endpoint is not connected", ENOTCONN},
110 : : {"Cannot send after transport endpoint shutdown", ESHUTDOWN},
111 : : {"Connection timed out", ETIMEDOUT},
112 : : {"Connection refused", ECONNREFUSED},
113 : : {"Host is down", EHOSTDOWN},
114 : : {"No route to host", EHOSTUNREACH},
115 : : {"Operation already in progress", EALREADY},
116 : : {"Operation now in progress", EINPROGRESS},
117 : : {"Is a named type file", EISNAM},
118 : : {"Remote I/O error", EREMOTEIO},
119 : : {"Disk quota exceeded", EDQUOT},
120 : : /* errors from fossil, vacfs, and u9fs */
121 : : {"fid unknown or out of range", EBADF},
122 : : {"permission denied", EACCES},
123 : : {"file does not exist", ENOENT},
124 : : {"authentication failed", ECONNREFUSED},
125 : : {"bad offset in directory read", ESPIPE},
126 : : {"bad use of fid", EBADF},
127 : : {"wstat can't convert between files and directories", EPERM},
128 : : {"directory is not empty", ENOTEMPTY},
129 : : {"file exists", EEXIST},
130 : : {"file already exists", EEXIST},
131 : : {"file or directory already exists", EEXIST},
132 : : {"fid already in use", EBADF},
133 : : {"file in use", ETXTBSY},
134 : : {"i/o error", EIO},
135 : : {"file already open for I/O", ETXTBSY},
136 : : {"illegal mode", EINVAL},
137 : : {"illegal name", ENAMETOOLONG},
138 : : {"not a directory", ENOTDIR},
139 : : {"not a member of proposed group", EPERM},
140 : : {"not owner", EACCES},
141 : : {"only owner can change group in wstat", EACCES},
142 : : {"read only file system", EROFS},
143 : : {"no access to special file", EPERM},
144 : : {"i/o count too large", EIO},
145 : : {"unknown group", EINVAL},
146 : : {"unknown user", EINVAL},
147 : : {"bogus wstat buffer", EPROTO},
148 : : {"exclusive use file already open", EAGAIN},
149 : : {"corrupted directory entry", EIO},
150 : : {"corrupted file entry", EIO},
151 : : {"corrupted block label", EIO},
152 : : {"corrupted meta data", EIO},
153 : : {"illegal offset", EINVAL},
154 : : {"illegal path element", ENOENT},
155 : : {"root of file system is corrupted", EIO},
156 : : {"corrupted super block", EIO},
157 : : {"protocol botch", EPROTO},
158 : : {"file system is full", ENOSPC},
159 : : {"file is in use", EAGAIN},
160 : : {"directory entry is not allocated", ENOENT},
161 : : {"file is read only", EROFS},
162 : : {"file has been removed", EIDRM},
163 : : {"only support truncation to zero length", EPERM},
164 : : {"cannot remove root", EPERM},
165 : : {"file too big", EFBIG},
166 : : {"venti i/o error", EIO},
167 : : /* these are not errors */
168 : : {"u9fs rhostsauth: no authentication required", 0},
169 : : {"u9fs authnone: no authentication required", 0},
170 : : {NULL, -1}
171 : : };
172 : :
173 : : /**
174 : : * p9_error_init - preload mappings into hash list
175 : : *
176 : : */
177 : :
178 : 21 : int p9_error_init(void)
179 : : {
180 : 21 : struct errormap *c;
181 : 21 : int bucket;
182 : :
183 : : /* initialize hash table */
184 [ + + ]: 693 : for (bucket = 0; bucket < ERRHASHSZ; bucket++)
185 : 672 : INIT_HLIST_HEAD(&hash_errmap[bucket]);
186 : :
187 : : /* load initial error map into hash table */
188 [ + + ]: 2646 : for (c = errmap; c->name != NULL; c++) {
189 : 2625 : c->namelen = strlen(c->name);
190 : 2625 : bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
191 [ + + ]: 2625 : INIT_HLIST_NODE(&c->list);
192 [ + + ]: 2625 : hlist_add_head(&c->list, &hash_errmap[bucket]);
193 : : }
194 : :
195 : 21 : return 1;
196 : : }
197 : : EXPORT_SYMBOL(p9_error_init);
198 : :
199 : : /**
200 : : * errstr2errno - convert error string to error number
201 : : * @errstr: error string
202 : : * @len: length of error string
203 : : *
204 : : */
205 : :
206 : 0 : int p9_errstr2errno(char *errstr, int len)
207 : : {
208 : 0 : int errno;
209 : 0 : struct errormap *c;
210 : 0 : int bucket;
211 : :
212 : 0 : errno = 0;
213 : 0 : c = NULL;
214 : 0 : bucket = jhash(errstr, len, 0) % ERRHASHSZ;
215 [ # # # # : 0 : hlist_for_each_entry(c, &hash_errmap[bucket], list) {
# # ]
216 [ # # # # ]: 0 : if (c->namelen == len && !memcmp(c->name, errstr, len)) {
217 : 0 : errno = c->val;
218 : 0 : break;
219 : : }
220 : : }
221 : :
222 [ # # ]: 0 : if (errno == 0) {
223 : : /* TODO: if error isn't found, add it dynamically */
224 : 0 : errstr[len] = 0;
225 : 0 : pr_err("%s: server reported unknown error %s\n",
226 : : __func__, errstr);
227 : 0 : errno = ESERVERFAULT;
228 : : }
229 : :
230 : 0 : return -errno;
231 : : }
232 : : EXPORT_SYMBOL(p9_errstr2errno);
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