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