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 
p9_error_init(void)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 
p9_errstr2errno(char * errstr,int len)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