248 lines
7.4 KiB
C
248 lines
7.4 KiB
C
/*
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* linux/fs/9p/error.c
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*
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* Error string handling
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*
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* Plan 9 uses error strings, Unix uses error numbers. These functions
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* try to help manage that and provide for dynamically adding error
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* mappings.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/jhash.h>
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#include <linux/errno.h>
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#include <net/9p/9p.h>
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/**
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* struct errormap - map string errors from Plan 9 to Linux numeric ids
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* @name: string sent over 9P
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* @val: numeric id most closely representing @name
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* @namelen: length of string
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* @list: hash-table list for string lookup
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*/
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struct errormap {
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char *name;
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int val;
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int namelen;
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struct hlist_node list;
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};
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#define ERRHASHSZ 32
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static struct hlist_head hash_errmap[ERRHASHSZ];
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/* FixMe - reduce to a reasonable size */
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static struct errormap errmap[] = {
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{"Operation not permitted", EPERM},
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{"wstat prohibited", EPERM},
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{"No such file or directory", ENOENT},
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{"directory entry not found", ENOENT},
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{"file not found", ENOENT},
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{"Interrupted system call", EINTR},
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{"Input/output error", EIO},
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{"No such device or address", ENXIO},
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{"Argument list too long", E2BIG},
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{"Bad file descriptor", EBADF},
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{"Resource temporarily unavailable", EAGAIN},
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{"Cannot allocate memory", ENOMEM},
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{"Permission denied", EACCES},
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{"Bad address", EFAULT},
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{"Block device required", ENOTBLK},
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{"Device or resource busy", EBUSY},
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{"File exists", EEXIST},
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{"Invalid cross-device link", EXDEV},
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{"No such device", ENODEV},
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{"Not a directory", ENOTDIR},
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{"Is a directory", EISDIR},
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{"Invalid argument", EINVAL},
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{"Too many open files in system", ENFILE},
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{"Too many open files", EMFILE},
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{"Text file busy", ETXTBSY},
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{"File too large", EFBIG},
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{"No space left on device", ENOSPC},
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{"Illegal seek", ESPIPE},
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{"Read-only file system", EROFS},
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{"Too many links", EMLINK},
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{"Broken pipe", EPIPE},
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{"Numerical argument out of domain", EDOM},
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{"Numerical result out of range", ERANGE},
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{"Resource deadlock avoided", EDEADLK},
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{"File name too long", ENAMETOOLONG},
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{"No locks available", ENOLCK},
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{"Function not implemented", ENOSYS},
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{"Directory not empty", ENOTEMPTY},
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{"Too many levels of symbolic links", ELOOP},
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{"No message of desired type", ENOMSG},
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{"Identifier removed", EIDRM},
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{"No data available", ENODATA},
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{"Machine is not on the network", ENONET},
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{"Package not installed", ENOPKG},
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{"Object is remote", EREMOTE},
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{"Link has been severed", ENOLINK},
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{"Communication error on send", ECOMM},
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{"Protocol error", EPROTO},
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{"Bad message", EBADMSG},
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{"File descriptor in bad state", EBADFD},
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{"Streams pipe error", ESTRPIPE},
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{"Too many users", EUSERS},
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{"Socket operation on non-socket", ENOTSOCK},
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{"Message too long", EMSGSIZE},
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{"Protocol not available", ENOPROTOOPT},
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{"Protocol not supported", EPROTONOSUPPORT},
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{"Socket type not supported", ESOCKTNOSUPPORT},
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{"Operation not supported", EOPNOTSUPP},
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{"Protocol family not supported", EPFNOSUPPORT},
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{"Network is down", ENETDOWN},
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{"Network is unreachable", ENETUNREACH},
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{"Network dropped connection on reset", ENETRESET},
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{"Software caused connection abort", ECONNABORTED},
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{"Connection reset by peer", ECONNRESET},
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{"No buffer space available", ENOBUFS},
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{"Transport endpoint is already connected", EISCONN},
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{"Transport endpoint is not connected", ENOTCONN},
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{"Cannot send after transport endpoint shutdown", ESHUTDOWN},
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{"Connection timed out", ETIMEDOUT},
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{"Connection refused", ECONNREFUSED},
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{"Host is down", EHOSTDOWN},
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{"No route to host", EHOSTUNREACH},
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{"Operation already in progress", EALREADY},
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{"Operation now in progress", EINPROGRESS},
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{"Is a named type file", EISNAM},
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{"Remote I/O error", EREMOTEIO},
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{"Disk quota exceeded", EDQUOT},
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/* errors from fossil, vacfs, and u9fs */
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{"fid unknown or out of range", EBADF},
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{"permission denied", EACCES},
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{"file does not exist", ENOENT},
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{"authentication failed", ECONNREFUSED},
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{"bad offset in directory read", ESPIPE},
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{"bad use of fid", EBADF},
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{"wstat can't convert between files and directories", EPERM},
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{"directory is not empty", ENOTEMPTY},
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{"file exists", EEXIST},
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{"file already exists", EEXIST},
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{"file or directory already exists", EEXIST},
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{"fid already in use", EBADF},
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{"file in use", ETXTBSY},
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{"i/o error", EIO},
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{"file already open for I/O", ETXTBSY},
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{"illegal mode", EINVAL},
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{"illegal name", ENAMETOOLONG},
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{"not a directory", ENOTDIR},
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{"not a member of proposed group", EPERM},
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{"not owner", EACCES},
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{"only owner can change group in wstat", EACCES},
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{"read only file system", EROFS},
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{"no access to special file", EPERM},
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{"i/o count too large", EIO},
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{"unknown group", EINVAL},
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{"unknown user", EINVAL},
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{"bogus wstat buffer", EPROTO},
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{"exclusive use file already open", EAGAIN},
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{"corrupted directory entry", EIO},
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{"corrupted file entry", EIO},
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{"corrupted block label", EIO},
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{"corrupted meta data", EIO},
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{"illegal offset", EINVAL},
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{"illegal path element", ENOENT},
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{"root of file system is corrupted", EIO},
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{"corrupted super block", EIO},
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{"protocol botch", EPROTO},
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{"file system is full", ENOSPC},
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{"file is in use", EAGAIN},
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{"directory entry is not allocated", ENOENT},
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{"file is read only", EROFS},
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{"file has been removed", EIDRM},
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{"only support truncation to zero length", EPERM},
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{"cannot remove root", EPERM},
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{"file too big", EFBIG},
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{"venti i/o error", EIO},
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/* these are not errors */
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{"u9fs rhostsauth: no authentication required", 0},
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{"u9fs authnone: no authentication required", 0},
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{NULL, -1}
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};
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/**
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* p9_error_init - preload mappings into hash list
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*
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*/
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int p9_error_init(void)
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{
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struct errormap *c;
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int bucket;
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/* initialize hash table */
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for (bucket = 0; bucket < ERRHASHSZ; bucket++)
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INIT_HLIST_HEAD(&hash_errmap[bucket]);
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/* load initial error map into hash table */
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for (c = errmap; c->name != NULL; c++) {
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c->namelen = strlen(c->name);
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bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
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INIT_HLIST_NODE(&c->list);
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hlist_add_head(&c->list, &hash_errmap[bucket]);
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}
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return 1;
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}
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EXPORT_SYMBOL(p9_error_init);
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/**
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* errstr2errno - convert error string to error number
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* @errstr: error string
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* @len: length of error string
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*
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*/
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int p9_errstr2errno(char *errstr, int len)
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{
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int errno;
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struct errormap *c;
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int bucket;
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errno = 0;
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c = NULL;
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bucket = jhash(errstr, len, 0) % ERRHASHSZ;
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hlist_for_each_entry(c, &hash_errmap[bucket], list) {
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if (c->namelen == len && !memcmp(c->name, errstr, len)) {
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errno = c->val;
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break;
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}
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}
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if (errno == 0) {
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/* TODO: if error isn't found, add it dynamically */
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errstr[len] = 0;
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pr_err("%s: server reported unknown error %s\n",
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__func__, errstr);
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errno = ESERVERFAULT;
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}
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return -errno;
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}
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EXPORT_SYMBOL(p9_errstr2errno);
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