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 */ 45 struct errormap { 46 char *name; 47 int val; 48 49 int namelen; 50 struct hlist_node list; 51 }; 52 53 #define ERRHASHSZ 32 54 static struct hlist_head hash_errmap[ERRHASHSZ]; 55 56 /* FixMe - reduce to a reasonable size */ 57 static 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 */ 192 193 int 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 } 212 EXPORT_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 */ 220 221 int p9_errstr2errno(char *errstr, int len) 222 { 223 int errno; 224 struct errormap *c; 225 int bucket; 226 227 errno = 0; 228 c = NULL; 229 bucket = jhash(errstr, len, 0) % ERRHASHSZ; 230 hlist_for_each_entry(c, &hash_errmap[bucket], list) { 231 if (c->namelen == len && !memcmp(c->name, errstr, len)) { 232 errno = c->val; 233 break; 234 } 235 } 236 237 if (errno == 0) { 238 /* TODO: if error isn't found, add it dynamically */ 239 errstr[len] = 0; 240 pr_err("%s: server reported unknown error %s\n", 241 __func__, errstr); 242 errno = ESERVERFAULT; 243 } 244 245 return -errno; 246 } 247 EXPORT_SYMBOL(p9_errstr2errno); 248