329 lines
7.1 KiB
C
329 lines
7.1 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) 2004-2008 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/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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* NOTE: each transport will parse its own options
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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_dfltuid, Opt_dfltgid, Opt_afid,
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/* String options */
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Opt_uname, Opt_remotename, Opt_trans,
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/* Options that take no arguments */
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Opt_nodevmap,
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/* Cache options */
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Opt_cache_loose,
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/* Access options */
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Opt_access,
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/* Error token */
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Opt_err
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};
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static const match_table_t tokens = {
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{Opt_debug, "debug=%x"},
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{Opt_dfltuid, "dfltuid=%u"},
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{Opt_dfltgid, "dfltgid=%u"},
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{Opt_afid, "afid=%u"},
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{Opt_uname, "uname=%s"},
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{Opt_remotename, "aname=%s"},
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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_access, "access=%s"},
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{Opt_err, NULL}
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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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* @v9ses: existing v9fs session information
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*
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* Return 0 upon success, -ERRNO upon failure.
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*/
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static int v9fs_parse_options(struct v9fs_session_info *v9ses)
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{
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char *options;
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substring_t args[MAX_OPT_ARGS];
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char *p;
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int option = 0;
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char *s, *e;
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int ret = 0;
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/* setup defaults */
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v9ses->afid = ~0;
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v9ses->debug = 0;
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v9ses->cache = 0;
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if (!v9ses->options)
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return 0;
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options = kstrdup(v9ses->options, GFP_KERNEL);
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if (!options) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"failed to allocate copy of option string\n");
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return -ENOMEM;
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}
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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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int r = match_int(&args[0], &option);
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if (r < 0) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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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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#ifdef CONFIG_NET_9P_DEBUG
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p9_debug_level = option;
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#endif
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break;
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case Opt_dfltuid:
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v9ses->dfltuid = option;
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break;
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case Opt_dfltgid:
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v9ses->dfltgid = 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_uname:
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match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
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break;
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case Opt_remotename:
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match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
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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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case Opt_access:
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s = match_strdup(&args[0]);
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if (!s) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"failed to allocate copy"
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" of option argument\n");
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ret = -ENOMEM;
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break;
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}
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v9ses->flags &= ~V9FS_ACCESS_MASK;
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if (strcmp(s, "user") == 0)
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v9ses->flags |= V9FS_ACCESS_USER;
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else if (strcmp(s, "any") == 0)
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v9ses->flags |= V9FS_ACCESS_ANY;
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else {
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v9ses->flags |= V9FS_ACCESS_SINGLE;
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v9ses->uid = simple_strtol(s, &e, 10);
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if (*e != '\0')
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v9ses->uid = ~0;
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}
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kfree(s);
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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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kfree(options);
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return ret;
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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_fid *fid;
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int rc;
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v9ses->uname = __getname();
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if (!v9ses->uname)
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return ERR_PTR(-ENOMEM);
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v9ses->aname = __getname();
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if (!v9ses->aname) {
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__putname(v9ses->uname);
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return ERR_PTR(-ENOMEM);
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}
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v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
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strcpy(v9ses->uname, V9FS_DEFUSER);
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strcpy(v9ses->aname, V9FS_DEFANAME);
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v9ses->uid = ~0;
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v9ses->dfltuid = V9FS_DEFUID;
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v9ses->dfltgid = V9FS_DEFGID;
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if (data) {
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v9ses->options = kstrdup(data, GFP_KERNEL);
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if (!v9ses->options) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"failed to allocate copy of option string\n");
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retval = -ENOMEM;
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goto error;
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}
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}
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rc = v9fs_parse_options(v9ses);
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if (rc < 0) {
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retval = rc;
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goto error;
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}
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v9ses->clnt = p9_client_create(dev_name, v9ses->options);
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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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if (!v9ses->clnt->dotu)
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v9ses->flags &= ~V9FS_EXTENDED;
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v9ses->maxdata = v9ses->clnt->msize;
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/* for legacy mode, fall back to V9FS_ACCESS_ANY */
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if (!v9fs_extended(v9ses) &&
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((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
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v9ses->flags &= ~V9FS_ACCESS_MASK;
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v9ses->flags |= V9FS_ACCESS_ANY;
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v9ses->uid = ~0;
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}
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fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
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v9ses->aname);
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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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if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
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fid->uid = v9ses->uid;
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else
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fid->uid = ~0;
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return fid;
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error:
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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->uname);
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__putname(v9ses->aname);
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kfree(v9ses->options);
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}
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/**
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* v9fs_session_cancel - terminate a session
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* @v9ses: session to terminate
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*
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* mark transport as disconnected 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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/* TODO: Setup list of registered trasnport modules */
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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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