9p: Reorganization of 9p file system code

This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p.
It moves the transport, packet marshalling and connection layers to net/9p
leaving only the VFS related files in fs/9p.  This work is being done in
preparation for in-kernel 9p servers as well as alternate 9p clients (other
than VFS).

Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 240 insertions, 0 deletions

diff --git a/net/9p/error.c b/net/9p/error.c
new file mode 100644
index 000000000000..ab2458b6c903
--- /dev/null
+++ b/net/9p/error.c
@@ -0,0 +1,240 @@
+/*
+ * 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);