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TOMOYO Linux Cross Reference
Linux/net/9p/error.c

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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 int p9_error_init(void)
179 {
180         struct errormap *c;
181         int bucket;
182 
183         /* initialize hash table */
184         for (bucket = 0; bucket < ERRHASHSZ; bucket++)
185                 INIT_HLIST_HEAD(&hash_errmap[bucket]);
186 
187         /* load initial error map into hash table */
188         for (c = errmap; c->name != NULL; c++) {
189                 c->namelen = strlen(c->name);
190                 bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
191                 INIT_HLIST_NODE(&c->list);
192                 hlist_add_head(&c->list, &hash_errmap[bucket]);
193         }
194 
195         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 int p9_errstr2errno(char *errstr, int len)
207 {
208         int errno;
209         struct errormap *c;
210         int bucket;
211 
212         errno = 0;
213         c = NULL;
214         bucket = jhash(errstr, len, 0) % ERRHASHSZ;
215         hlist_for_each_entry(c, &hash_errmap[bucket], list) {
216                 if (c->namelen == len && !memcmp(c->name, errstr, len)) {
217                         errno = c->val;
218                         break;
219                 }
220         }
221 
222         if (errno == 0) {
223                 /* TODO: if error isn't found, add it dynamically */
224                 errstr[len] = 0;
225                 pr_err("%s: server reported unknown error %s\n",
226                        __func__, errstr);
227                 errno = ESERVERFAULT;
228         }
229 
230         return -errno;
231 }
232 EXPORT_SYMBOL(p9_errstr2errno);
233 

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