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

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