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 */
  45struct errormap {
  46        char *name;
  47        int val;
  48
  49        int namelen;
  50        struct hlist_node list;
  51};
  52
  53#define ERRHASHSZ               32
  54static struct hlist_head hash_errmap[ERRHASHSZ];
  55
  56/* FixMe - reduce to a reasonable size */
  57static 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
 193int 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}
 212EXPORT_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
 221int 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}
 249EXPORT_SYMBOL(p9_errstr2errno);
 250
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