net/9p/error.c

   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);