/* * linux/fs/9p/v9fs.c * * This file contains functions assisting in mapping VFS to 9P2000 * * Copyright (C) 2004-2008 by Eric Van Hensbergen * Copyright (C) 2002 by Ron Minnich * * 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 #include #include #include #include #include #include #include #include #include "v9fs.h" #include "v9fs_vfs.h" /* * Option Parsing (code inspired by NFS code) * NOTE: each transport will parse its own options */ enum { /* Options that take integer arguments */ Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, /* String options */ Opt_uname, Opt_remotename, Opt_trans, /* Options that take no arguments */ Opt_nodevmap, /* Cache options */ Opt_cache_loose, /* Access options */ Opt_access, /* Error token */ Opt_err }; static match_table_t tokens = { {Opt_debug, "debug=%x"}, {Opt_dfltuid, "dfltuid=%u"}, {Opt_dfltgid, "dfltgid=%u"}, {Opt_afid, "afid=%u"}, {Opt_uname, "uname=%s"}, {Opt_remotename, "aname=%s"}, {Opt_nodevmap, "nodevmap"}, {Opt_cache_loose, "cache=loose"}, {Opt_cache_loose, "loose"}, {Opt_access, "access=%s"}, {Opt_err, NULL} }; /** * v9fs_parse_options - parse mount options into session structure * @v9ses: existing v9fs session information * * Return 0 upon success, -ERRNO upon failure. */ static int v9fs_parse_options(struct v9fs_session_info *v9ses) { char *options; substring_t args[MAX_OPT_ARGS]; char *p; int option = 0; char *s, *e; int ret = 0; /* setup defaults */ v9ses->afid = ~0; v9ses->debug = 0; v9ses->cache = 0; if (!v9ses->options) return 0; options = kstrdup(v9ses->options, GFP_KERNEL); if (!options) { P9_DPRINTK(P9_DEBUG_ERROR, "failed to allocate copy of option string\n"); return -ENOMEM; } while ((p = strsep(&options, ",")) != NULL) { int token; if (!*p) continue; token = match_token(p, tokens, args); if (token < Opt_uname) { int r = match_int(&args[0], &option); if (r < 0) { P9_DPRINTK(P9_DEBUG_ERROR, "integer field, but no integer?\n"); ret = r; continue; } } switch (token) { case Opt_debug: v9ses->debug = option; #ifdef CONFIG_NET_9P_DEBUG p9_debug_level = option; #endif break; case Opt_dfltuid: v9ses->dfltuid = option; break; case Opt_dfltgid: v9ses->dfltgid = option; break; case Opt_afid: v9ses->afid = option; break; case Opt_uname: match_strlcpy(v9ses->uname, &args[0], PATH_MAX); break; case Opt_remotename: match_strlcpy(v9ses->aname, &args[0], PATH_MAX); break; case Opt_nodevmap: v9ses->nodev = 1; break; case Opt_cache_loose: v9ses->cache = CACHE_LOOSE; break; case Opt_access: s = match_strdup(&args[0]); if (!s) { P9_DPRINTK(P9_DEBUG_ERROR, "failed to allocate copy" " of option argument\n"); ret = -ENOMEM; break; } v9ses->flags &= ~V9FS_ACCESS_MASK; if (strcmp(s, "user") == 0) v9ses->flags |= V9FS_ACCESS_USER; else if (strcmp(s, "any") == 0) v9ses->flags |= V9FS_ACCESS_ANY; else { v9ses->flags |= V9FS_ACCESS_SINGLE; v9ses->uid = simple_strtol(s, &e, 10); if (*e != '\0') v9ses->uid = ~0; } kfree(s); break; default: continue; } } kfree(options); return ret; } /** * 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_fid *fid; int rc; v9ses->uname = __getname(); if (!v9ses->uname) return ERR_PTR(-ENOMEM); v9ses->aname = __getname(); if (!v9ses->aname) { __putname(v9ses->uname); return ERR_PTR(-ENOMEM); } v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER; strcpy(v9ses->uname, V9FS_DEFUSER); strcpy(v9ses->aname, V9FS_DEFANAME); v9ses->uid = ~0; v9ses->dfltuid = V9FS_DEFUID; v9ses->dfltgid = V9FS_DEFGID; v9ses->options = kstrdup(data, GFP_KERNEL); if (!v9ses->options) { P9_DPRINTK(P9_DEBUG_ERROR, "failed to allocate copy of option string\n"); retval = -ENOMEM; goto error; } rc = v9fs_parse_options(v9ses); if (rc < 0) { retval = rc; goto error; } v9ses->clnt = p9_client_create(dev_name, v9ses->options); 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; } if (!v9ses->clnt->dotu) v9ses->flags &= ~V9FS_EXTENDED; v9ses->maxdata = v9ses->clnt->msize; /* for legacy mode, fall back to V9FS_ACCESS_ANY */ if (!v9fs_extended(v9ses) && ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { v9ses->flags &= ~V9FS_ACCESS_MASK; v9ses->flags |= V9FS_ACCESS_ANY; v9ses->uid = ~0; } fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, v9ses->aname); if (IS_ERR(fid)) { retval = PTR_ERR(fid); fid = NULL; P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); goto error; } if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) fid->uid = v9ses->uid; else fid->uid = ~0; 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->uname); __putname(v9ses->aname); kfree(v9ses->options); } /** * v9fs_session_cancel - terminate a session * @v9ses: session to terminate * * 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"); /* TODO: Setup list of registered trasnport modules */ 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 "); MODULE_AUTHOR("Eric Van Hensbergen "); MODULE_AUTHOR("Ron Minnich "); MODULE_LICENSE("GPL");