Subversion Repositories test_project

/*

 * linux/fs/9p/error.c

 *

 * 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>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2

 *  as published by the Free Software Foundation.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to:

 *  Free Software Foundation

 *  51 Franklin Street, Fifth Floor

 *  Boston, MA  02111-1301  USA

 *

 */

#include <linux/module.h>

#include <linux/list.h>

#include <linux/jhash.h>

#include <linux/errno.h>

#include <net/9p/9p.h>

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

 * @errstr: error string

 *

 */

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 != NULL; 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);

/**

 * errstr2errno - convert error string to error number

 * @errstr: error string

 *

 */

int p9_errstr2errno(char *errstr, int len)

{

        int errno;

        struct hlist_node *p;

        struct errormap *c;

        int bucket;

        errno = 0;

        p = NULL;

        c = NULL;

        bucket = jhash(errstr, len, 0) % ERRHASHSZ;

        hlist_for_each_entry(c, p, &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;

                printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,

                       errstr);

                errno = 1;

        }

        return -errno;

}

EXPORT_SYMBOL(p9_errstr2errno);