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 */
 28struct errormap {
 29	char *name;
 30	int val;
 31
 32	int namelen;
 33	struct hlist_node list;
 34};
 35
 36#define ERRHASHSZ		32
 37static struct hlist_head hash_errmap[ERRHASHSZ];
 38
 39/* FixMe - reduce to a reasonable size */
 40static 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
176int 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}
195EXPORT_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
204int 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}
230EXPORT_SYMBOL(p9_errstr2errno);

  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 */
 28struct errormap {
 29	char *name;
 30	int val;
 31
 32	int namelen;
 33	struct hlist_node list;
 34};
 35
 36#define ERRHASHSZ		32
 37static struct hlist_head hash_errmap[ERRHASHSZ];
 38
 39/* FixMe - reduce to a reasonable size */
 40static 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
176int 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}
195EXPORT_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
204int 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}
230EXPORT_SYMBOL(p9_errstr2errno);