net/9p/error.c

   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 hlist_node *p;
 225         struct errormap *c;
 226         int bucket;
 227
 228         errno = 0;
 229         p = NULL;
 230         c = NULL;
 231         bucket = jhash(errstr, len, 0) % ERRHASHSZ;
 232         hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
 233                 if (c->namelen == len && !memcmp(c->name, errstr, len)) {
 234                         errno = c->val;
 235                         break;
 236                 }
 237         }
 238
 239         if (errno == 0) {
 240                 /* TODO: if error isn't found, add it dynamically */
 241                 errstr[len] = 0;
 242                 pr_err("%s: server reported unknown error %s\n",
 243                        __func__, errstr);
 244                 errno = ESERVERFAULT;
 245         }
 246
 247         return -errno;
 248 }
 249 EXPORT_SYMBOL(p9_errstr2errno);