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// SPDX-License-Identifier: GPL-2.0-only
/*
* Error string handling
*
* Plan 9 uses error strings, Unix uses error numbers. These functions
* try to help manage that and provide for dynamically adding error
* mappings.
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/list.h>
#include <linux/jhash.h>
#include <linux/errno.h>
#include <net/9p/9p.h>
/**
* struct errormap - map string errors from Plan 9 to Linux numeric ids
* @name: string sent over 9P
* @val: numeric id most closely representing @name
* @namelen: length of string
* @list: hash-table list for string lookup
*/
struct errormap {
char *name;
int val;
int namelen;
struct hlist_node list;
};
#define ERRHASHSZ 32
static struct hlist_head hash_errmap[ERRHASHSZ];
/* FixMe - reduce to a reasonable size */
static struct errormap errmap[] = {
{"Operation not permitted", EPERM},
{"wstat prohibited", EPERM},
{"No such file or directory", ENOENT},
{"directory entry not found", ENOENT},
{"file not found", ENOENT},
{"Interrupted system call", EINTR},
{"Input/output error", EIO},
{"No such device or address", ENXIO},
{"Argument list too long", E2BIG},
{"Bad file descriptor", EBADF},
{"Resource temporarily unavailable", EAGAIN},
{"Cannot allocate memory", ENOMEM},
{"Permission denied", EACCES},
{"Bad address", EFAULT},
{"Block device required", ENOTBLK},
{"Device or resource busy", EBUSY},
{"File exists", EEXIST},
{"Invalid cross-device link", EXDEV},
{"No such device", ENODEV},
{"Not a directory", ENOTDIR},
{"Is a directory", EISDIR},
{"Invalid argument", EINVAL},
{"Too many open files in system", ENFILE},
{"Too many open files", EMFILE},
{"Text file busy", ETXTBSY},
{"File too large", EFBIG},
{"No space left on device", ENOSPC},
{"Illegal seek", ESPIPE},
{"Read-only file system", EROFS},
{"Too many links", EMLINK},
{"Broken pipe", EPIPE},
{"Numerical argument out of domain", EDOM},
{"Numerical result out of range", ERANGE},
{"Resource deadlock avoided", EDEADLK},
{"File name too long", ENAMETOOLONG},
{"No locks available", ENOLCK},
{"Function not implemented", ENOSYS},
{"Directory not empty", ENOTEMPTY},
{"Too many levels of symbolic links", ELOOP},
{"No message of desired type", ENOMSG},
{"Identifier removed", EIDRM},
{"No data available", ENODATA},
{"Machine is not on the network", ENONET},
{"Package not installed", ENOPKG},
{"Object is remote", EREMOTE},
{"Link has been severed", ENOLINK},
{"Communication error on send", ECOMM},
{"Protocol error", EPROTO},
{"Bad message", EBADMSG},
{"File descriptor in bad state", EBADFD},
{"Streams pipe error", ESTRPIPE},
{"Too many users", EUSERS},
{"Socket operation on non-socket", ENOTSOCK},
{"Message too long", EMSGSIZE},
{"Protocol not available", ENOPROTOOPT},
{"Protocol not supported", EPROTONOSUPPORT},
{"Socket type not supported", ESOCKTNOSUPPORT},
{"Operation not supported", EOPNOTSUPP},
{"Protocol family not supported", EPFNOSUPPORT},
{"Network is down", ENETDOWN},
{"Network is unreachable", ENETUNREACH},
{"Network dropped connection on reset", ENETRESET},
{"Software caused connection abort", ECONNABORTED},
{"Connection reset by peer", ECONNRESET},
{"No buffer space available", ENOBUFS},
{"Transport endpoint is already connected", EISCONN},
{"Transport endpoint is not connected", ENOTCONN},
{"Cannot send after transport endpoint shutdown", ESHUTDOWN},
{"Connection timed out", ETIMEDOUT},
{"Connection refused", ECONNREFUSED},
{"Host is down", EHOSTDOWN},
{"No route to host", EHOSTUNREACH},
{"Operation already in progress", EALREADY},
{"Operation now in progress", EINPROGRESS},
{"Is a named type file", EISNAM},
{"Remote I/O error", EREMOTEIO},
{"Disk quota exceeded", EDQUOT},
/* errors from fossil, vacfs, and u9fs */
{"fid unknown or out of range", EBADF},
{"permission denied", EACCES},
{"file does not exist", ENOENT},
{"authentication failed", ECONNREFUSED},
{"bad offset in directory read", ESPIPE},
{"bad use of fid", EBADF},
{"wstat can't convert between files and directories", EPERM},
{"directory is not empty", ENOTEMPTY},
{"file exists", EEXIST},
{"file already exists", EEXIST},
{"file or directory already exists", EEXIST},
{"fid already in use", EBADF},
{"file in use", ETXTBSY},
{"i/o error", EIO},
{"file already open for I/O", ETXTBSY},
{"illegal mode", EINVAL},
{"illegal name", ENAMETOOLONG},
{"not a directory", ENOTDIR},
{"not a member of proposed group", EPERM},
{"not owner", EACCES},
{"only owner can change group in wstat", EACCES},
{"read only file system", EROFS},
{"no access to special file", EPERM},
{"i/o count too large", EIO},
{"unknown group", EINVAL},
{"unknown user", EINVAL},
{"bogus wstat buffer", EPROTO},
{"exclusive use file already open", EAGAIN},
{"corrupted directory entry", EIO},
{"corrupted file entry", EIO},
{"corrupted block label", EIO},
{"corrupted meta data", EIO},
{"illegal offset", EINVAL},
{"illegal path element", ENOENT},
{"root of file system is corrupted", EIO},
{"corrupted super block", EIO},
{"protocol botch", EPROTO},
{"file system is full", ENOSPC},
{"file is in use", EAGAIN},
{"directory entry is not allocated", ENOENT},
{"file is read only", EROFS},
{"file has been removed", EIDRM},
{"only support truncation to zero length", EPERM},
{"cannot remove root", EPERM},
{"file too big", EFBIG},
{"venti i/o error", EIO},
/* these are not errors */
{"u9fs rhostsauth: no authentication required", 0},
{"u9fs authnone: no authentication required", 0},
{NULL, -1}
};
/**
* p9_error_init - preload mappings into hash list
*
*/
int p9_error_init(void)
{
struct errormap *c;
int bucket;
/* initialize hash table */
for (bucket = 0; bucket < ERRHASHSZ; bucket++)
INIT_HLIST_HEAD(&hash_errmap[bucket]);
/* load initial error map into hash table */
for (c = errmap; c->name; c++) {
c->namelen = strlen(c->name);
bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
INIT_HLIST_NODE(&c->list);
hlist_add_head(&c->list, &hash_errmap[bucket]);
}
return 1;
}
EXPORT_SYMBOL(p9_error_init);
/**
* p9_errstr2errno - convert error string to error number
* @errstr: error string
* @len: length of error string
*
*/
int p9_errstr2errno(char *errstr, int len)
{
int errno;
struct errormap *c;
int bucket;
errno = 0;
c = NULL;
bucket = jhash(errstr, len, 0) % ERRHASHSZ;
hlist_for_each_entry(c, &hash_errmap[bucket], list) {
if (c->namelen == len && !memcmp(c->name, errstr, len)) {
errno = c->val;
break;
}
}
if (errno == 0) {
/* TODO: if error isn't found, add it dynamically */
errstr[len] = 0;
pr_err("%s: server reported unknown error %s\n",
__func__, errstr);
errno = ESERVERFAULT;
}
return -errno;
}
EXPORT_SYMBOL(p9_errstr2errno);
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