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#include <linux/module.h> 31#include <linux/list.h> 32#include <linux/jhash.h> 33#include <linux/errno.h> 34#include <net/9p/9p.h> 35 36/** 37 * struct errormap - map string errors from Plan 9 to Linux numeric ids 38 * @name: string sent over 9P 39 * @val: numeric id most closely representing @name 40 * @namelen: length of string 41 * @list: hash-table list for string lookup 42 */ 43struct errormap { 44 char *name; 45 int val; 46 47 int namelen; 48 struct hlist_node list; 49}; 50 51#define ERRHASHSZ 32 52static struct hlist_head hash_errmap[ERRHASHSZ]; 53 54static struct errormap errmap[] = { 55 {"Operation not permitted", EPERM}, 56 {"wstat prohibited", EPERM}, 57 {"No such file or directory", ENOENT}, 58 {"directory entry not found", ENOENT}, 59 {"file not found", ENOENT}, 60 {"Interrupted system call", EINTR}, 61 {"Input/output error", EIO}, 62 {"No such device or address", ENXIO}, 63 {"Argument list too long", E2BIG}, 64 {"Bad file descriptor", EBADF}, 65 {"Resource temporarily unavailable", EAGAIN}, 66 {"Cannot allocate memory", ENOMEM}, 67 {"Permission denied", EACCES}, 68 {"Bad address", EFAULT}, 69 {"Block device required", ENOTBLK}, 70 {"Device or resource busy", EBUSY}, 71 {"File exists", EEXIST}, 72 {"Invalid cross-device link", EXDEV}, 73 {"No such device", ENODEV}, 74 {"Not a directory", ENOTDIR}, 75 {"Is a directory", EISDIR}, 76 {"Invalid argument", EINVAL}, 77 {"Too many open files in system", ENFILE}, 78 {"Too many open files", EMFILE}, 79 {"Text file busy", ETXTBSY}, 80 {"File too large", EFBIG}, 81 {"No space left on device", ENOSPC}, 82 {"Illegal seek", ESPIPE}, 83 {"Read-only file system", EROFS}, 84 {"Too many links", EMLINK}, 85 {"Broken pipe", EPIPE}, 86 {"Numerical argument out of domain", EDOM}, 87 {"Numerical result out of range", ERANGE}, 88 {"Resource deadlock avoided", EDEADLK}, 89 {"File name too long", ENAMETOOLONG}, 90 {"No locks available", ENOLCK}, 91 {"Function not implemented", ENOSYS}, 92 {"Directory not empty", ENOTEMPTY}, 93 {"Too many levels of symbolic links", ELOOP}, 94 {"No message of desired type", ENOMSG}, 95 {"Identifier removed", EIDRM}, 96 {"No data available", ENODATA}, 97 {"Machine is not on the network", ENONET}, 98 {"Package not installed", ENOPKG}, 99 {"Object is remote", EREMOTE}, 100 {"Link has been severed", ENOLINK}, 101 {"Communication error on send", ECOMM}, 102 {"Protocol error", EPROTO}, 103 {"Bad message", EBADMSG}, 104 {"File descriptor in bad state", EBADFD}, 105 {"Streams pipe error", ESTRPIPE}, 106 {"Too many users", EUSERS}, 107 {"Socket operation on non-socket", ENOTSOCK}, 108 {"Message too long", EMSGSIZE}, 109 {"Protocol not available", ENOPROTOOPT}, 110 {"Protocol not supported", EPROTONOSUPPORT}, 111 {"Socket type not supported", ESOCKTNOSUPPORT}, 112 {"Operation not supported", EOPNOTSUPP}, 113 {"Protocol family not supported", EPFNOSUPPORT}, 114 {"Network is down", ENETDOWN}, 115 {"Network is unreachable", ENETUNREACH}, 116 {"Network dropped connection on reset", ENETRESET}, 117 {"Software caused connection abort", ECONNABORTED}, 118 {"Connection reset by peer", ECONNRESET}, 119 {"No buffer space available", ENOBUFS}, 120 {"Transport endpoint is already connected", EISCONN}, 121 {"Transport endpoint is not connected", ENOTCONN}, 122 {"Cannot send after transport endpoint shutdown", ESHUTDOWN}, 123 {"Connection timed out", ETIMEDOUT}, 124 {"Connection refused", ECONNREFUSED}, 125 {"Host is down", EHOSTDOWN}, 126 {"No route to host", EHOSTUNREACH}, 127 {"Operation already in progress", EALREADY}, 128 {"Operation now in progress", EINPROGRESS}, 129 {"Is a named type file", EISNAM}, 130 {"Remote I/O error", EREMOTEIO}, 131 {"Disk quota exceeded", EDQUOT}, 132/* errors from fossil, vacfs, and u9fs */ 133 {"fid unknown or out of range", EBADF}, 134 {"permission denied", EACCES}, 135 {"file does not exist", ENOENT}, 136 {"authentication failed", ECONNREFUSED}, 137 {"bad offset in directory read", ESPIPE}, 138 {"bad use of fid", EBADF}, 139 {"wstat can't convert between files and directories", EPERM}, 140 {"directory is not empty", ENOTEMPTY}, 141 {"file exists", EEXIST}, 142 {"file already exists", EEXIST}, 143 {"file or directory already exists", EEXIST}, 144 {"fid already in use", EBADF}, 145 {"file in use", ETXTBSY}, 146 {"i/o error", EIO}, 147 {"file already open for I/O", ETXTBSY}, 148 {"illegal mode", EINVAL}, 149 {"illegal name", ENAMETOOLONG}, 150 {"not a directory", ENOTDIR}, 151 {"not a member of proposed group", EPERM}, 152 {"not owner", EACCES}, 153 {"only owner can change group in wstat", EACCES}, 154 {"read only file system", EROFS}, 155 {"no access to special file", EPERM}, 156 {"i/o count too large", EIO}, 157 {"unknown group", EINVAL}, 158 {"unknown user", EINVAL}, 159 {"bogus wstat buffer", EPROTO}, 160 {"exclusive use file already open", EAGAIN}, 161 {"corrupted directory entry", EIO}, 162 {"corrupted file entry", EIO}, 163 {"corrupted block label", EIO}, 164 {"corrupted meta data", EIO}, 165 {"illegal offset", EINVAL}, 166 {"illegal path element", ENOENT}, 167 {"root of file system is corrupted", EIO}, 168 {"corrupted super block", EIO}, 169 {"protocol botch", EPROTO}, 170 {"file system is full", ENOSPC}, 171 {"file is in use", EAGAIN}, 172 {"directory entry is not allocated", ENOENT}, 173 {"file is read only", EROFS}, 174 {"file has been removed", EIDRM}, 175 {"only support truncation to zero length", EPERM}, 176 {"cannot remove root", EPERM}, 177 {"file too big", EFBIG}, 178 {"venti i/o error", EIO}, 179 /* these are not errors */ 180 {"u9fs rhostsauth: no authentication required", 0}, 181 {"u9fs authnone: no authentication required", 0}, 182 {NULL, -1} 183}; 184 185/** 186 * p9_error_init - preload mappings into hash list 187 * 188 */ 189 190int p9_error_init(void) 191{ 192 struct errormap *c; 193 int bucket; 194 195 /* initialize hash table */ 196 for (bucket = 0; bucket < ERRHASHSZ; bucket++) 197 INIT_HLIST_HEAD(&hash_errmap[bucket]); 198 199 /* load initial error map into hash table */ 200 for (c = errmap; c->name != NULL; c++) { 201 c->namelen = strlen(c->name); 202 bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ; 203 INIT_HLIST_NODE(&c->list); 204 hlist_add_head(&c->list, &hash_errmap[bucket]); 205 } 206 207 return 1; 208} 209EXPORT_SYMBOL(p9_error_init); 210 211/** 212 * errstr2errno - convert error string to error number 213 * @errstr: error string 214 * @len: length of error string 215 * 216 */ 217 218int p9_errstr2errno(char *errstr, int len) 219{ 220 int errno; 221 struct hlist_node *p; 222 struct errormap *c; 223 int bucket; 224 225 errno = 0; 226 p = NULL; 227 c = NULL; 228 bucket = jhash(errstr, len, 0) % ERRHASHSZ; 229 hlist_for_each_entry(c, p, &hash_errmap[bucket], list) { 230 if (c->namelen == len && !memcmp(c->name, errstr, len)) { 231 errno = c->val; 232 break; 233 } 234 } 235 236 if (errno == 0) { 237 /* TODO: if error isn't found, add it dynamically */ 238 errstr[len] = 0; 239 printk(KERN_ERR "%s: server reported unknown error %s\n", 240 __func__, errstr); 241 errno = ESERVERFAULT; 242 } 243 244 return -errno; 245} 246EXPORT_SYMBOL(p9_errstr2errno); 247