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 */
  30struct errormap {
  31        char *name;
  32        int val;
  33
  34        int namelen;
  35        struct hlist_node list;
  36};
  37
  38#define ERRHASHSZ               32
  39static struct hlist_head hash_errmap[ERRHASHSZ];
  40
  41/* FixMe - reduce to a reasonable size */
  42static 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
 178int 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}
 197EXPORT_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
 206int 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}
 232EXPORT_SYMBOL(p9_errstr2errno);
 233