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); 231