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 <linux/hashtable.h> 20 #include <net/9p/9p.h> 21 22 /** 23 * struct errormap - map string errors from Plan 9 to Linux numeric ids 24 * @name: string sent over 9P 25 * @val: numeric id most closely representing @name 26 * @namelen: length of string 27 * @list: hash-table list for string lookup 28 */ 29 struct errormap { 30 char *name; 31 int val; 32 33 int namelen; 34 struct hlist_node list; 35 }; 36 37 #define ERRHASH_BITS 5 38 static DEFINE_HASHTABLE(hash_errmap, ERRHASH_BITS); 39 40 /* FixMe - reduce to a reasonable size */ 41 static struct errormap errmap[] = { 42 {"Operation not permitted", EPERM}, 43 {"wstat prohibited", EPERM}, 44 {"No such file or directory", ENOENT}, 45 {"directory entry not found", ENOENT}, 46 {"file not found", ENOENT}, 47 {"Interrupted system call", EINTR}, 48 {"Input/output error", EIO}, 49 {"No such device or address", ENXIO}, 50 {"Argument list too long", E2BIG}, 51 {"Bad file descriptor", EBADF}, 52 {"Resource temporarily unavailable", EAGAIN}, 53 {"Cannot allocate memory", ENOMEM}, 54 {"Permission denied", EACCES}, 55 {"Bad address", EFAULT}, 56 {"Block device required", ENOTBLK}, 57 {"Device or resource busy", EBUSY}, 58 {"File exists", EEXIST}, 59 {"Invalid cross-device link", EXDEV}, 60 {"No such device", ENODEV}, 61 {"Not a directory", ENOTDIR}, 62 {"Is a directory", EISDIR}, 63 {"Invalid argument", EINVAL}, 64 {"Too many open files in system", ENFILE}, 65 {"Too many open files", EMFILE}, 66 {"Text file busy", ETXTBSY}, 67 {"File too large", EFBIG}, 68 {"No space left on device", ENOSPC}, 69 {"Illegal seek", ESPIPE}, 70 {"Read-only file system", EROFS}, 71 {"Too many links", EMLINK}, 72 {"Broken pipe", EPIPE}, 73 {"Numerical argument out of domain", EDOM}, 74 {"Numerical result out of range", ERANGE}, 75 {"Resource deadlock avoided", EDEADLK}, 76 {"File name too long", ENAMETOOLONG}, 77 {"No locks available", ENOLCK}, 78 {"Function not implemented", ENOSYS}, 79 {"Directory not empty", ENOTEMPTY}, 80 {"Too many levels of symbolic links", ELOOP}, 81 {"No message of desired type", ENOMSG}, 82 {"Identifier removed", EIDRM}, 83 {"No data available", ENODATA}, 84 {"Machine is not on the network", ENONET}, 85 {"Package not installed", ENOPKG}, 86 {"Object is remote", EREMOTE}, 87 {"Link has been severed", ENOLINK}, 88 {"Communication error on send", ECOMM}, 89 {"Protocol error", EPROTO}, 90 {"Bad message", EBADMSG}, 91 {"File descriptor in bad state", EBADFD}, 92 {"Streams pipe error", ESTRPIPE}, 93 {"Too many users", EUSERS}, 94 {"Socket operation on non-socket", ENOTSOCK}, 95 {"Message too long", EMSGSIZE}, 96 {"Protocol not available", ENOPROTOOPT}, 97 {"Protocol not supported", EPROTONOSUPPORT}, 98 {"Socket type not supported", ESOCKTNOSUPPORT}, 99 {"Operation not supported", EOPNOTSUPP}, 100 {"Protocol family not supported", EPFNOSUPPORT}, 101 {"Network is down", ENETDOWN}, 102 {"Network is unreachable", ENETUNREACH}, 103 {"Network dropped connection on reset", ENETRESET}, 104 {"Software caused connection abort", ECONNABORTED}, 105 {"Connection reset by peer", ECONNRESET}, 106 {"No buffer space available", ENOBUFS}, 107 {"Transport endpoint is already connected", EISCONN}, 108 {"Transport endpoint is not connected", ENOTCONN}, 109 {"Cannot send after transport endpoint shutdown", ESHUTDOWN}, 110 {"Connection timed out", ETIMEDOUT}, 111 {"Connection refused", ECONNREFUSED}, 112 {"Host is down", EHOSTDOWN}, 113 {"No route to host", EHOSTUNREACH}, 114 {"Operation already in progress", EALREADY}, 115 {"Operation now in progress", EINPROGRESS}, 116 {"Is a named type file", EISNAM}, 117 {"Remote I/O error", EREMOTEIO}, 118 {"Disk quota exceeded", EDQUOT}, 119 /* errors from fossil, vacfs, and u9fs */ 120 {"fid unknown or out of range", EBADF}, 121 {"permission denied", EACCES}, 122 {"file does not exist", ENOENT}, 123 {"authentication failed", ECONNREFUSED}, 124 {"bad offset in directory read", ESPIPE}, 125 {"bad use of fid", EBADF}, 126 {"wstat can't convert between files and directories", EPERM}, 127 {"directory is not empty", ENOTEMPTY}, 128 {"file exists", EEXIST}, 129 {"file already exists", EEXIST}, 130 {"file or directory already exists", EEXIST}, 131 {"fid already in use", EBADF}, 132 {"file in use", ETXTBSY}, 133 {"i/o error", EIO}, 134 {"file already open for I/O", ETXTBSY}, 135 {"illegal mode", EINVAL}, 136 {"illegal name", ENAMETOOLONG}, 137 {"not a directory", ENOTDIR}, 138 {"not a member of proposed group", EPERM}, 139 {"not owner", EACCES}, 140 {"only owner can change group in wstat", EACCES}, 141 {"read only file system", EROFS}, 142 {"no access to special file", EPERM}, 143 {"i/o count too large", EIO}, 144 {"unknown group", EINVAL}, 145 {"unknown user", EINVAL}, 146 {"bogus wstat buffer", EPROTO}, 147 {"exclusive use file already open", EAGAIN}, 148 {"corrupted directory entry", EIO}, 149 {"corrupted file entry", EIO}, 150 {"corrupted block label", EIO}, 151 {"corrupted meta data", EIO}, 152 {"illegal offset", EINVAL}, 153 {"illegal path element", ENOENT}, 154 {"root of file system is corrupted", EIO}, 155 {"corrupted super block", EIO}, 156 {"protocol botch", EPROTO}, 157 {"file system is full", ENOSPC}, 158 {"file is in use", EAGAIN}, 159 {"directory entry is not allocated", ENOENT}, 160 {"file is read only", EROFS}, 161 {"file has been removed", EIDRM}, 162 {"only support truncation to zero length", EPERM}, 163 {"cannot remove root", EPERM}, 164 {"file too big", EFBIG}, 165 {"venti i/o error", EIO}, 166 /* these are not errors */ 167 {"u9fs rhostsauth: no authentication required", 0}, 168 {"u9fs authnone: no authentication required", 0}, 169 {NULL, -1} 170 }; 171 172 /** 173 * p9_error_init - preload mappings into hash list 174 * 175 */ 176 177 int p9_error_init(void) 178 { 179 struct errormap *c; 180 u32 hash; 181 182 /* load initial error map into hash table */ 183 for (c = errmap; c->name; c++) { 184 c->namelen = strlen(c->name); 185 hash = jhash(c->name, c->namelen, 0); 186 INIT_HLIST_NODE(&c->list); 187 hash_add(hash_errmap, &c->list, hash); 188 } 189 190 return 1; 191 } 192 EXPORT_SYMBOL(p9_error_init); 193 194 /** 195 * p9_errstr2errno - convert error string to error number 196 * @errstr: error string 197 * @len: length of error string 198 * 199 */ 200 201 int p9_errstr2errno(char *errstr, int len) 202 { 203 int errno; 204 struct errormap *c; 205 u32 hash; 206 207 errno = 0; 208 c = NULL; 209 hash = jhash(errstr, len, 0); 210 hash_for_each_possible(hash_errmap, c, list, hash) { 211 if (c->namelen == len && !memcmp(c->name, errstr, len)) { 212 errno = c->val; 213 break; 214 } 215 } 216 217 if (errno == 0) { 218 /* TODO: if error isn't found, add it dynamically */ 219 errstr[len] = 0; 220 pr_err("%s: server reported unknown error %s\n", 221 __func__, errstr); 222 errno = ESERVERFAULT; 223 } 224 225 return -errno; 226 } 227 EXPORT_SYMBOL(p9_errstr2errno); 228