333 lines
7.0 KiB
C
333 lines
7.0 KiB
C
/*
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* linux/fs/9p/v9fs.c
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*
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* This file contains functions assisting in mapping VFS to 9P2000
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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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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/parser.h>
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#include <linux/idr.h>
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#include <net/9p/9p.h>
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#include <net/9p/transport.h>
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#include <net/9p/conn.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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/*
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* Option Parsing (code inspired by NFS code)
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*
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*/
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enum {
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/* Options that take integer arguments */
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Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
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Opt_rfdno, Opt_wfdno,
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/* String options */
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Opt_uname, Opt_remotename,
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/* Options that take no arguments */
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Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
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/* Cache options */
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Opt_cache_loose,
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/* Error token */
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Opt_err
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};
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static match_table_t tokens = {
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{Opt_debug, "debug=%x"},
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{Opt_port, "port=%u"},
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{Opt_msize, "msize=%u"},
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_afid, "afid=%u"},
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{Opt_rfdno, "rfdno=%u"},
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{Opt_wfdno, "wfdno=%u"},
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{Opt_uname, "uname=%s"},
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{Opt_remotename, "aname=%s"},
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{Opt_unix, "proto=unix"},
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{Opt_tcp, "proto=tcp"},
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{Opt_fd, "proto=fd"},
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#ifdef CONFIG_PCI_9P
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{Opt_pci, "proto=pci"},
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#endif
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{Opt_tcp, "tcp"},
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{Opt_unix, "unix"},
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{Opt_fd, "fd"},
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{Opt_legacy, "noextend"},
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{Opt_nodevmap, "nodevmap"},
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{Opt_cache_loose, "cache=loose"},
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{Opt_cache_loose, "loose"},
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{Opt_err, NULL}
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};
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extern struct p9_transport *p9pci_trans_create(void);
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/*
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* Parse option string.
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*/
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/**
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* v9fs_parse_options - parse mount options into session structure
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* @options: options string passed from mount
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* @v9ses: existing v9fs session information
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*
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*/
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static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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int ret;
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/* setup defaults */
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v9ses->port = V9FS_PORT;
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v9ses->maxdata = 9000;
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v9ses->proto = PROTO_TCP;
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v9ses->extended = 1;
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v9ses->afid = ~0;
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v9ses->debug = 0;
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v9ses->rfdno = ~0;
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v9ses->wfdno = ~0;
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v9ses->cache = 0;
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if (!options)
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return;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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if (token < Opt_uname) {
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if ((ret = match_int(&args[0], &option)) < 0) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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continue;
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}
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}
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switch (token) {
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case Opt_debug:
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v9ses->debug = option;
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p9_debug_level = option;
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break;
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case Opt_port:
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v9ses->port = option;
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break;
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case Opt_msize:
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v9ses->maxdata = option;
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break;
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case Opt_uid:
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v9ses->uid = option;
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break;
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case Opt_gid:
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v9ses->gid = option;
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break;
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case Opt_afid:
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v9ses->afid = option;
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break;
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case Opt_rfdno:
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v9ses->rfdno = option;
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break;
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case Opt_wfdno:
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v9ses->wfdno = option;
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break;
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case Opt_tcp:
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v9ses->proto = PROTO_TCP;
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break;
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case Opt_unix:
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v9ses->proto = PROTO_UNIX;
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break;
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case Opt_pci:
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v9ses->proto = PROTO_PCI;
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break;
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case Opt_fd:
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v9ses->proto = PROTO_FD;
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break;
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case Opt_uname:
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match_strcpy(v9ses->name, &args[0]);
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break;
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case Opt_remotename:
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match_strcpy(v9ses->remotename, &args[0]);
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break;
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case Opt_legacy:
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v9ses->extended = 0;
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break;
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case Opt_nodevmap:
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v9ses->nodev = 1;
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break;
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case Opt_cache_loose:
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v9ses->cache = CACHE_LOOSE;
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break;
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default:
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continue;
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}
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}
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}
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/**
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* v9fs_session_init - initialize session
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* @v9ses: session information structure
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* @dev_name: device being mounted
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* @data: options
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*
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*/
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struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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const char *dev_name, char *data)
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{
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int retval = -EINVAL;
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struct p9_transport *trans;
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struct p9_fid *fid;
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v9ses->name = __getname();
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if (!v9ses->name)
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return ERR_PTR(-ENOMEM);
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v9ses->remotename = __getname();
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if (!v9ses->remotename) {
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__putname(v9ses->name);
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return ERR_PTR(-ENOMEM);
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}
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strcpy(v9ses->name, V9FS_DEFUSER);
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strcpy(v9ses->remotename, V9FS_DEFANAME);
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v9fs_parse_options(data, v9ses);
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switch (v9ses->proto) {
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case PROTO_TCP:
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trans = p9_trans_create_tcp(dev_name, v9ses->port);
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break;
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case PROTO_UNIX:
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trans = p9_trans_create_unix(dev_name);
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*v9ses->remotename = 0;
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break;
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case PROTO_FD:
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trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
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*v9ses->remotename = 0;
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break;
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#ifdef CONFIG_PCI_9P
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case PROTO_PCI:
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trans = p9pci_trans_create();
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*v9ses->remotename = 0;
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break;
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#endif
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default:
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printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
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retval = -ENOPROTOOPT;
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goto error;
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};
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if (IS_ERR(trans)) {
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retval = PTR_ERR(trans);
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trans = NULL;
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goto error;
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}
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v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
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v9ses->extended);
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if (IS_ERR(v9ses->clnt)) {
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retval = PTR_ERR(v9ses->clnt);
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v9ses->clnt = NULL;
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P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
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goto error;
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}
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fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
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v9ses->remotename);
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if (IS_ERR(fid)) {
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retval = PTR_ERR(fid);
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fid = NULL;
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P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
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goto error;
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}
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return fid;
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error:
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v9fs_session_close(v9ses);
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return ERR_PTR(retval);
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}
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/**
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* v9fs_session_close - shutdown a session
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* @v9ses: session information structure
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*
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*/
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void v9fs_session_close(struct v9fs_session_info *v9ses)
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{
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if (v9ses->clnt) {
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p9_client_destroy(v9ses->clnt);
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v9ses->clnt = NULL;
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}
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__putname(v9ses->name);
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__putname(v9ses->remotename);
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}
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/**
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* v9fs_session_cancel - mark transport as disconnected
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* and cancel all pending requests.
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*/
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void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
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P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
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p9_client_disconnect(v9ses->clnt);
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}
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extern int v9fs_error_init(void);
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/**
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* v9fs_init - Initialize module
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*
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*/
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static int __init init_v9fs(void)
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{
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printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
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return register_filesystem(&v9fs_fs_type);
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}
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/**
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* v9fs_init - shutdown module
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*
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*/
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static void __exit exit_v9fs(void)
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{
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unregister_filesystem(&v9fs_fs_type);
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}
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module_init(init_v9fs)
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module_exit(exit_v9fs)
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MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
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MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
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MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
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MODULE_LICENSE("GPL");
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