net/9p/error.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Error string handling
   4  *
   5  * Plan 9 uses error strings, Unix uses error numbers.  These functions
   6  * try to help manage that and provide for dynamically adding error
   7  * mappings.
   8  *
   9  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  10  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/list.h>
  17 #include <linux/jhash.h>
  18 #include <linux/errno.h>
  19 #include <net/9p/9p.h>
  20
  21 /**
  22  * struct errormap - map string errors from Plan 9 to Linux numeric ids
  23  * @name: string sent over 9P
  24  * @val: numeric id most closely representing @name
  25  * @namelen: length of string
  26  * @list: hash-table list for string lookup
  27  */
  28 struct errormap {
  29         char *name;
  30         int val;
  31
  32         int namelen;
  33         struct hlist_node list;
  34 };
  35
  36 #define ERRHASHSZ               32
  37 static struct hlist_head hash_errmap[ERRHASHSZ];
  38
  39 /* FixMe - reduce to a reasonable size */
  40 static struct errormap errmap[] = {
  41         {"Operation not permitted", EPERM},
  42         {"wstat prohibited", EPERM},
  43         {"No such file or directory", ENOENT},
  44         {"directory entry not found", ENOENT},
  45         {"file not found", ENOENT},
  46         {"Interrupted system call", EINTR},
  47         {"Input/output error", EIO},
  48         {"No such device or address", ENXIO},
  49         {"Argument list too long", E2BIG},
  50         {"Bad file descriptor", EBADF},
  51         {"Resource temporarily unavailable", EAGAIN},
  52         {"Cannot allocate memory", ENOMEM},
  53         {"Permission denied", EACCES},
  54         {"Bad address", EFAULT},
  55         {"Block device required", ENOTBLK},
  56         {"Device or resource busy", EBUSY},
  57         {"File exists", EEXIST},
  58         {"Invalid cross-device link", EXDEV},
  59         {"No such device", ENODEV},
  60         {"Not a directory", ENOTDIR},
  61         {"Is a directory", EISDIR},
  62         {"Invalid argument", EINVAL},
  63         {"Too many open files in system", ENFILE},
  64         {"Too many open files", EMFILE},
  65         {"Text file busy", ETXTBSY},
  66         {"File too large", EFBIG},
  67         {"No space left on device", ENOSPC},
  68         {"Illegal seek", ESPIPE},
  69         {"Read-only file system", EROFS},
  70         {"Too many links", EMLINK},
  71         {"Broken pipe", EPIPE},
  72         {"Numerical argument out of domain", EDOM},
  73         {"Numerical result out of range", ERANGE},
  74         {"Resource deadlock avoided", EDEADLK},
  75         {"File name too long", ENAMETOOLONG},
  76         {"No locks available", ENOLCK},
  77         {"Function not implemented", ENOSYS},
  78         {"Directory not empty", ENOTEMPTY},
  79         {"Too many levels of symbolic links", ELOOP},
  80         {"No message of desired type", ENOMSG},
  81         {"Identifier removed", EIDRM},
  82         {"No data available", ENODATA},
  83         {"Machine is not on the network", ENONET},
  84         {"Package not installed", ENOPKG},
  85         {"Object is remote", EREMOTE},
  86         {"Link has been severed", ENOLINK},
  87         {"Communication error on send", ECOMM},
  88         {"Protocol error", EPROTO},
  89         {"Bad message", EBADMSG},
  90         {"File descriptor in bad state", EBADFD},
  91         {"Streams pipe error", ESTRPIPE},
  92         {"Too many users", EUSERS},
  93         {"Socket operation on non-socket", ENOTSOCK},
  94         {"Message too long", EMSGSIZE},
  95         {"Protocol not available", ENOPROTOOPT},
  96         {"Protocol not supported", EPROTONOSUPPORT},
  97         {"Socket type not supported", ESOCKTNOSUPPORT},
  98         {"Operation not supported", EOPNOTSUPP},
  99         {"Protocol family not supported", EPFNOSUPPORT},
 100         {"Network is down", ENETDOWN},
 101         {"Network is unreachable", ENETUNREACH},
 102         {"Network dropped connection on reset", ENETRESET},
 103         {"Software caused connection abort", ECONNABORTED},
 104         {"Connection reset by peer", ECONNRESET},
 105         {"No buffer space available", ENOBUFS},
 106         {"Transport endpoint is already connected", EISCONN},
 107         {"Transport endpoint is not connected", ENOTCONN},
 108         {"Cannot send after transport endpoint shutdown", ESHUTDOWN},
 109         {"Connection timed out", ETIMEDOUT},
 110         {"Connection refused", ECONNREFUSED},
 111         {"Host is down", EHOSTDOWN},
 112         {"No route to host", EHOSTUNREACH},
 113         {"Operation already in progress", EALREADY},
 114         {"Operation now in progress", EINPROGRESS},
 115         {"Is a named type file", EISNAM},
 116         {"Remote I/O error", EREMOTEIO},
 117         {"Disk quota exceeded", EDQUOT},
 118 /* errors from fossil, vacfs, and u9fs */
 119         {"fid unknown or out of range", EBADF},
 120         {"permission denied", EACCES},
 121         {"file does not exist", ENOENT},
 122         {"authentication failed", ECONNREFUSED},
 123         {"bad offset in directory read", ESPIPE},
 124         {"bad use of fid", EBADF},
 125         {"wstat can't convert between files and directories", EPERM},
 126         {"directory is not empty", ENOTEMPTY},
 127         {"file exists", EEXIST},
 128         {"file already exists", EEXIST},
 129         {"file or directory already exists", EEXIST},
 130         {"fid already in use", EBADF},
 131         {"file in use", ETXTBSY},
 132         {"i/o error", EIO},
 133         {"file already open for I/O", ETXTBSY},
 134         {"illegal mode", EINVAL},
 135         {"illegal name", ENAMETOOLONG},
 136         {"not a directory", ENOTDIR},
 137         {"not a member of proposed group", EPERM},
 138         {"not owner", EACCES},
 139         {"only owner can change group in wstat", EACCES},
 140         {"read only file system", EROFS},
 141         {"no access to special file", EPERM},
 142         {"i/o count too large", EIO},
 143         {"unknown group", EINVAL},
 144         {"unknown user", EINVAL},
 145         {"bogus wstat buffer", EPROTO},
 146         {"exclusive use file already open", EAGAIN},
 147         {"corrupted directory entry", EIO},
 148         {"corrupted file entry", EIO},
 149         {"corrupted block label", EIO},
 150         {"corrupted meta data", EIO},
 151         {"illegal offset", EINVAL},
 152         {"illegal path element", ENOENT},
 153         {"root of file system is corrupted", EIO},
 154         {"corrupted super block", EIO},
 155         {"protocol botch", EPROTO},
 156         {"file system is full", ENOSPC},
 157         {"file is in use", EAGAIN},
 158         {"directory entry is not allocated", ENOENT},
 159         {"file is read only", EROFS},
 160         {"file has been removed", EIDRM},
 161         {"only support truncation to zero length", EPERM},
 162         {"cannot remove root", EPERM},
 163         {"file too big", EFBIG},
 164         {"venti i/o error", EIO},
 165         /* these are not errors */
 166         {"u9fs rhostsauth: no authentication required", 0},
 167         {"u9fs authnone: no authentication required", 0},
 168         {NULL, -1}
 169 };
 170
 171 /**
 172  * p9_error_init - preload mappings into hash list
 173  *
 174  */
 175
 176 int p9_error_init(void)
 177 {
 178         struct errormap *c;
 179         int bucket;
 180
 181         /* initialize hash table */
 182         for (bucket = 0; bucket < ERRHASHSZ; bucket++)
 183                 INIT_HLIST_HEAD(&hash_errmap[bucket]);
 184
 185         /* load initial error map into hash table */
 186         for (c = errmap; c->name; c++) {
 187                 c->namelen = strlen(c->name);
 188                 bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
 189                 INIT_HLIST_NODE(&c->list);
 190                 hlist_add_head(&c->list, &hash_errmap[bucket]);
 191         }
 192
 193         return 1;
 194 }
 195 EXPORT_SYMBOL(p9_error_init);
 196
 197 /**
 198  * p9_errstr2errno - convert error string to error number
 199  * @errstr: error string
 200  * @len: length of error string
 201  *
 202  */
 203
 204 int p9_errstr2errno(char *errstr, int len)
 205 {
 206         int errno;
 207         struct errormap *c;
 208         int bucket;
 209
 210         errno = 0;
 211         c = NULL;
 212         bucket = jhash(errstr, len, 0) % ERRHASHSZ;
 213         hlist_for_each_entry(c, &hash_errmap[bucket], list) {
 214                 if (c->namelen == len && !memcmp(c->name, errstr, len)) {
 215                         errno = c->val;
 216                         break;
 217                 }
 218         }
 219
 220         if (errno == 0) {
 221                 /* TODO: if error isn't found, add it dynamically */
 222                 errstr[len] = 0;
 223                 pr_err("%s: server reported unknown error %s\n",
 224                        __func__, errstr);
 225                 errno = ESERVERFAULT;
 226         }
 227
 228         return -errno;
 229 }
 230 EXPORT_SYMBOL(p9_errstr2errno);