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 <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 */
 29struct errormap {
 30	char *name;
 31	int val;
 32
 33	int namelen;
 34	struct hlist_node list;
 35};
 36
 37#define ERRHASH_BITS 5
 38static DEFINE_HASHTABLE(hash_errmap, ERRHASH_BITS);
 39
 40/* FixMe - reduce to a reasonable size */
 41static 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
177int 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}
192EXPORT_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
201int 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}
227EXPORT_SYMBOL(p9_errstr2errno);