forked from Minki/linux
[PATCH] v9fs: VFS superblock operations and glue
This part of the patch contains VFS superblock and mapping code. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Van Hensbergen
Linus Torvalds
parent
2bad847151
commit
9e82cf6a80
448
fs/9p/v9fs.c
Normal file
448
fs/9p/v9fs.c
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@ -0,0 +1,448 @@
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/*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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/config.h>
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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/parser.h>
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#include <linux/idr.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "9p.h"
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#include "v9fs_vfs.h"
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#include "transport.h"
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#include "mux.h"
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#include "conv.h"
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/* TODO: sysfs or debugfs interface */
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int v9fs_debug_level = 0; /* feature-rific global debug level */
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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_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
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Opt_rfdno, Opt_wfdno,
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/* String options */
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Opt_name, 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,
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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_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_debug, "debug=%u"},
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{Opt_name, "name=%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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{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_err, NULL}
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};
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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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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_name) {
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if ((ret = match_int(&args[0], &option)) < 0) {
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dprintk(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_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_debug:
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v9ses->debug = 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_fd:
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v9ses->proto = PROTO_FD;
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break;
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case Opt_name:
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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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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_inode2v9ses - safely extract v9fs session info from super block
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* @inode: inode to extract information from
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*
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* Paranoid function to extract v9ses information from superblock,
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* if anything is missing it will report an error.
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*
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*/
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struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
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{
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return (inode->i_sb->s_fs_info);
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}
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/**
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* v9fs_get_idpool - allocate numeric id from pool
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* @p - pool to allocate from
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*
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* XXX - This seems to be an awful generic function, should it be in idr.c with
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* the lock included in struct idr?
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*/
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int v9fs_get_idpool(struct v9fs_idpool *p)
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{
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int i = 0;
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int error;
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retry:
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if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
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return 0;
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if (down_interruptible(&p->lock) == -EINTR) {
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eprintk(KERN_WARNING, "Interrupted while locking\n");
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return -1;
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}
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error = idr_get_new(&p->pool, NULL, &i);
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up(&p->lock);
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if (error == -EAGAIN)
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goto retry;
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else if (error)
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return -1;
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return i;
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}
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/**
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* v9fs_put_idpool - release numeric id from pool
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* @p - pool to allocate from
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*
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* XXX - This seems to be an awful generic function, should it be in idr.c with
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* the lock included in struct idr?
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*/
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void v9fs_put_idpool(int id, struct v9fs_idpool *p)
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{
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if (down_interruptible(&p->lock) == -EINTR) {
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eprintk(KERN_WARNING, "Interrupted while locking\n");
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return;
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}
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idr_remove(&p->pool, id);
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up(&p->lock);
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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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int
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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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struct v9fs_fcall *fcall = NULL;
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struct v9fs_transport *trans_proto;
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int n = 0;
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int newfid = -1;
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int retval = -EINVAL;
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v9ses->name = __getname();
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if (!v9ses->name)
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return -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 -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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/* set global debug level */
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v9fs_debug_level = v9ses->debug;
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/* id pools that are session-dependent: FIDs and TIDs */
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idr_init(&v9ses->fidpool.pool);
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init_MUTEX(&v9ses->fidpool.lock);
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idr_init(&v9ses->tidpool.pool);
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init_MUTEX(&v9ses->tidpool.lock);
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switch (v9ses->proto) {
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case PROTO_TCP:
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trans_proto = &v9fs_trans_tcp;
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break;
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case PROTO_UNIX:
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trans_proto = &v9fs_trans_unix;
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*v9ses->remotename = 0;
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break;
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case PROTO_FD:
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trans_proto = &v9fs_trans_fd;
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*v9ses->remotename = 0;
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if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
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printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
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retval = -ENOPROTOOPT;
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goto SessCleanUp;
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}
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break;
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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 SessCleanUp;
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};
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v9ses->transport = trans_proto;
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if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
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eprintk(KERN_ERR, "problem initializing transport\n");
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goto SessCleanUp;
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}
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v9ses->inprogress = 0;
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v9ses->shutdown = 0;
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v9ses->session_hung = 0;
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if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
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dprintk(DEBUG_ERROR, "problem initializing mux\n");
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goto SessCleanUp;
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}
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if (v9ses->afid == ~0) {
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if (v9ses->extended)
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retval =
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v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u",
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&fcall);
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else
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retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000",
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&fcall);
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if (retval < 0) {
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dprintk(DEBUG_ERROR, "v9fs_t_version failed\n");
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goto FreeFcall;
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}
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/* Really should check for 9P1 and report error */
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if (!strcmp(fcall->params.rversion.version, "9P2000.u")) {
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dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
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v9ses->extended = 1;
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} else {
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dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
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v9ses->extended = 0;
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}
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n = fcall->params.rversion.msize;
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kfree(fcall);
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if (n < v9ses->maxdata)
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v9ses->maxdata = n;
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}
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newfid = v9fs_get_idpool(&v9ses->fidpool);
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if (newfid < 0) {
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eprintk(KERN_WARNING, "couldn't allocate FID\n");
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retval = -ENOMEM;
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goto SessCleanUp;
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}
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/* it is a little bit ugly, but we have to prevent newfid */
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/* being the same as afid, so if it is, get a new fid */
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if (v9ses->afid != ~0 && newfid == v9ses->afid) {
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newfid = v9fs_get_idpool(&v9ses->fidpool);
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if (newfid < 0) {
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eprintk(KERN_WARNING, "couldn't allocate FID\n");
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retval = -ENOMEM;
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goto SessCleanUp;
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}
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}
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if ((retval =
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v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid,
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v9ses->afid, NULL))
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< 0) {
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dprintk(DEBUG_ERROR, "cannot attach\n");
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goto SessCleanUp;
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}
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if (v9ses->afid != ~0) {
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if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
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dprintk(DEBUG_ERROR, "clunk failed\n");
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}
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return newfid;
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FreeFcall:
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kfree(fcall);
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SessCleanUp:
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v9fs_session_close(v9ses);
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return 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->recvproc) {
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send_sig(SIGKILL, v9ses->recvproc, 1);
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wait_for_completion(&v9ses->proccmpl);
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}
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if (v9ses->transport)
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v9ses->transport->close(v9ses->transport);
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putname(v9ses->name);
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putname(v9ses->remotename);
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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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v9fs_error_init();
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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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/**
|
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* v9fs_init - shutdown module
|
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*
|
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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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|
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module_init(init_v9fs)
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module_exit(exit_v9fs)
|
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|
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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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105
fs/9p/v9fs.h
Normal file
105
fs/9p/v9fs.h
Normal file
@ -0,0 +1,105 @@
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/*
|
||||
* V9FS definitions.
|
||||
*
|
||||
* 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 as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* 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
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* Idpool structure provides lock and id management
|
||||
*
|
||||
*/
|
||||
|
||||
struct v9fs_idpool {
|
||||
struct semaphore lock;
|
||||
struct idr pool;
|
||||
};
|
||||
|
||||
/*
|
||||
* Session structure provides information for an opened session
|
||||
*
|
||||
*/
|
||||
|
||||
struct v9fs_session_info {
|
||||
/* options */
|
||||
unsigned int maxdata;
|
||||
unsigned char extended; /* set to 1 if we are using UNIX extensions */
|
||||
unsigned char nodev; /* set to 1 if no disable device mapping */
|
||||
unsigned short port; /* port to connect to */
|
||||
unsigned short debug; /* debug level */
|
||||
unsigned short proto; /* protocol to use */
|
||||
unsigned int afid; /* authentication fid */
|
||||
unsigned int rfdno; /* read file descriptor number */
|
||||
unsigned int wfdno; /* write file descriptor number */
|
||||
|
||||
|
||||
char *name; /* user name to mount as */
|
||||
char *remotename; /* name of remote hierarchy being mounted */
|
||||
unsigned int uid; /* default uid/muid for legacy support */
|
||||
unsigned int gid; /* default gid for legacy support */
|
||||
|
||||
/* book keeping */
|
||||
struct v9fs_idpool fidpool; /* The FID pool for file descriptors */
|
||||
struct v9fs_idpool tidpool; /* The TID pool for transactions ids */
|
||||
|
||||
/* transport information */
|
||||
struct v9fs_transport *transport;
|
||||
|
||||
int inprogress; /* session in progress => true */
|
||||
int shutdown; /* session shutting down. no more attaches. */
|
||||
unsigned char session_hung;
|
||||
|
||||
/* mux private data */
|
||||
struct v9fs_fcall *curfcall;
|
||||
wait_queue_head_t read_wait;
|
||||
struct completion fcread;
|
||||
struct completion proccmpl;
|
||||
struct task_struct *recvproc;
|
||||
|
||||
spinlock_t muxlock;
|
||||
struct list_head mux_fcalls;
|
||||
};
|
||||
|
||||
/* possible values of ->proto */
|
||||
enum {
|
||||
PROTO_TCP,
|
||||
PROTO_UNIX,
|
||||
PROTO_FD,
|
||||
};
|
||||
|
||||
int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
|
||||
struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
|
||||
void v9fs_session_close(struct v9fs_session_info *v9ses);
|
||||
int v9fs_get_idpool(struct v9fs_idpool *p);
|
||||
void v9fs_put_idpool(int id, struct v9fs_idpool *p);
|
||||
int v9fs_get_option(char *opts, char *name, char *buf, int buflen);
|
||||
long long v9fs_get_int_option(char *opts, char *name, long long dflt);
|
||||
int v9fs_parse_tcp_devname(const char *devname, char **addr, char **remotename);
|
||||
|
||||
#define V9FS_MAGIC 0x01021997
|
||||
|
||||
/* other default globals */
|
||||
#define V9FS_PORT 564
|
||||
#define V9FS_DEFUSER "nobody"
|
||||
#define V9FS_DEFANAME ""
|
||||
|
||||
/* inital pool sizes for fids and tags */
|
||||
#define V9FS_START_FIDS 8192
|
||||
#define V9FS_START_TIDS 256
|
||||
53
fs/9p/v9fs_vfs.h
Normal file
53
fs/9p/v9fs_vfs.h
Normal file
@ -0,0 +1,53 @@
|
||||
/*
|
||||
* V9FS VFS extensions.
|
||||
*
|
||||
* 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 as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* 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
|
||||
*
|
||||
*/
|
||||
|
||||
/* plan9 semantics are that created files are implicitly opened.
|
||||
* But linux semantics are that you call create, then open.
|
||||
* the plan9 approach is superior as it provides an atomic
|
||||
* open.
|
||||
* we track the create fid here. When the file is opened, if fidopen is
|
||||
* non-zero, we use the fid and can skip some steps.
|
||||
* there may be a better way to do this, but I don't know it.
|
||||
* one BAD way is to clunk the fid on create, then open it again:
|
||||
* you lose the atomicity of file open
|
||||
*/
|
||||
|
||||
/* special case:
|
||||
* unlink calls remove, which is an implicit clunk. So we have to track
|
||||
* that kind of thing so that we don't try to clunk a dead fid.
|
||||
*/
|
||||
|
||||
extern struct file_system_type v9fs_fs_type;
|
||||
extern struct file_operations v9fs_file_operations;
|
||||
extern struct file_operations v9fs_dir_operations;
|
||||
extern struct dentry_operations v9fs_dentry_operations;
|
||||
|
||||
struct inode *v9fs_get_inode(struct super_block *sb, int mode);
|
||||
ino_t v9fs_qid2ino(struct v9fs_qid *qid);
|
||||
void v9fs_mistat2inode(struct v9fs_stat *, struct inode *,
|
||||
struct super_block *);
|
||||
int v9fs_dir_release(struct inode *inode, struct file *filp);
|
||||
int v9fs_file_open(struct inode *inode, struct file *file);
|
||||
void v9fs_inode2mistat(struct inode *inode, struct v9fs_stat *mistat);
|
||||
void v9fs_dentry_release(struct dentry *);
|
||||
271
fs/9p/vfs_super.c
Normal file
271
fs/9p/vfs_super.c
Normal file
@ -0,0 +1,271 @@
|
||||
/*
|
||||
* linux/fs/9p/vfs_super.c
|
||||
*
|
||||
* This file contians superblock ops for 9P2000. It is intended that
|
||||
* you mount this file system on directories.
|
||||
*
|
||||
* 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 as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* 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/kernel.h>
|
||||
#include <linux/config.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/file.h>
|
||||
#include <linux/stat.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/inet.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/mount.h>
|
||||
#include <linux/idr.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "v9fs.h"
|
||||
#include "9p.h"
|
||||
#include "v9fs_vfs.h"
|
||||
#include "conv.h"
|
||||
#include "fid.h"
|
||||
|
||||
static void v9fs_clear_inode(struct inode *);
|
||||
static struct super_operations v9fs_super_ops;
|
||||
|
||||
/**
|
||||
* v9fs_clear_inode - release an inode
|
||||
* @inode: inode to release
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_clear_inode(struct inode *inode)
|
||||
{
|
||||
filemap_fdatawrite(inode->i_mapping);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_set_super - set the superblock
|
||||
* @s: super block
|
||||
* @data: file system specific data
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_set_super(struct super_block *s, void *data)
|
||||
{
|
||||
s->s_fs_info = data;
|
||||
return set_anon_super(s, data);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_fill_super - populate superblock with info
|
||||
* @sb: superblock
|
||||
* @v9ses: session information
|
||||
*
|
||||
*/
|
||||
|
||||
static void
|
||||
v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
|
||||
int flags)
|
||||
{
|
||||
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
||||
sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
|
||||
sb->s_blocksize = 1 << sb->s_blocksize_bits;
|
||||
sb->s_magic = V9FS_MAGIC;
|
||||
sb->s_op = &v9fs_super_ops;
|
||||
|
||||
sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
|
||||
MS_NODIRATIME | MS_NOATIME;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_get_sb - mount a superblock
|
||||
* @fs_type: file system type
|
||||
* @flags: mount flags
|
||||
* @dev_name: device name that was mounted
|
||||
* @data: mount options
|
||||
*
|
||||
*/
|
||||
|
||||
static struct super_block *v9fs_get_sb(struct file_system_type
|
||||
*fs_type, int flags,
|
||||
const char *dev_name, void *data)
|
||||
{
|
||||
struct super_block *sb = NULL;
|
||||
struct v9fs_fcall *fcall = NULL;
|
||||
struct inode *inode = NULL;
|
||||
struct dentry *root = NULL;
|
||||
struct v9fs_session_info *v9ses = NULL;
|
||||
struct v9fs_fid *root_fid = NULL;
|
||||
int mode = S_IRWXUGO | S_ISVTX;
|
||||
uid_t uid = current->fsuid;
|
||||
gid_t gid = current->fsgid;
|
||||
int stat_result = 0;
|
||||
int newfid = 0;
|
||||
int retval = 0;
|
||||
|
||||
dprintk(DEBUG_VFS, " \n");
|
||||
|
||||
v9ses = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL);
|
||||
if (!v9ses)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
|
||||
dprintk(DEBUG_ERROR, "problem initiating session\n");
|
||||
retval = newfid;
|
||||
goto free_session;
|
||||
}
|
||||
|
||||
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
|
||||
|
||||
v9fs_fill_super(sb, v9ses, flags);
|
||||
|
||||
inode = v9fs_get_inode(sb, S_IFDIR | mode);
|
||||
if (IS_ERR(inode)) {
|
||||
retval = PTR_ERR(inode);
|
||||
goto put_back_sb;
|
||||
}
|
||||
|
||||
inode->i_uid = uid;
|
||||
inode->i_gid = gid;
|
||||
|
||||
root = d_alloc_root(inode);
|
||||
|
||||
if (!root) {
|
||||
retval = -ENOMEM;
|
||||
goto release_inode;
|
||||
}
|
||||
|
||||
sb->s_root = root;
|
||||
|
||||
/* Setup the Root Inode */
|
||||
root_fid = v9fs_fid_create(root);
|
||||
if (root_fid == NULL) {
|
||||
retval = -ENOMEM;
|
||||
goto release_dentry;
|
||||
}
|
||||
|
||||
root_fid->fidopen = 0;
|
||||
root_fid->v9ses = v9ses;
|
||||
|
||||
stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
|
||||
if (stat_result < 0) {
|
||||
dprintk(DEBUG_ERROR, "stat error\n");
|
||||
v9fs_t_clunk(v9ses, newfid, NULL);
|
||||
v9fs_put_idpool(newfid, &v9ses->fidpool);
|
||||
} else {
|
||||
root_fid->fid = newfid;
|
||||
root_fid->qid = fcall->params.rstat.stat->qid;
|
||||
root->d_inode->i_ino =
|
||||
v9fs_qid2ino(&fcall->params.rstat.stat->qid);
|
||||
v9fs_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb);
|
||||
}
|
||||
|
||||
kfree(fcall);
|
||||
|
||||
if (stat_result < 0) {
|
||||
retval = stat_result;
|
||||
goto release_dentry;
|
||||
}
|
||||
|
||||
return sb;
|
||||
|
||||
release_dentry:
|
||||
dput(sb->s_root);
|
||||
|
||||
release_inode:
|
||||
iput(inode);
|
||||
|
||||
put_back_sb:
|
||||
up_write(&sb->s_umount);
|
||||
deactivate_super(sb);
|
||||
v9fs_session_close(v9ses);
|
||||
|
||||
free_session:
|
||||
kfree(v9ses);
|
||||
|
||||
return ERR_PTR(retval);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_kill_super - Kill Superblock
|
||||
* @s: superblock
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_kill_super(struct super_block *s)
|
||||
{
|
||||
struct v9fs_session_info *v9ses = s->s_fs_info;
|
||||
|
||||
dprintk(DEBUG_VFS, " %p\n", s);
|
||||
|
||||
v9fs_dentry_release(s->s_root); /* clunk root */
|
||||
|
||||
kill_anon_super(s);
|
||||
|
||||
v9fs_session_close(v9ses);
|
||||
kfree(v9ses);
|
||||
dprintk(DEBUG_VFS, "exiting kill_super\n");
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_show_options - Show mount options in /proc/mounts
|
||||
* @m: seq_file to write to
|
||||
* @mnt: mount descriptor
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
|
||||
{
|
||||
struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
|
||||
|
||||
if (v9ses->debug != 0)
|
||||
seq_printf(m, ",debug=%u", v9ses->debug);
|
||||
if (v9ses->port != V9FS_PORT)
|
||||
seq_printf(m, ",port=%u", v9ses->port);
|
||||
if (v9ses->maxdata != 9000)
|
||||
seq_printf(m, ",msize=%u", v9ses->maxdata);
|
||||
if (v9ses->afid != ~0)
|
||||
seq_printf(m, ",afid=%u", v9ses->afid);
|
||||
if (v9ses->proto == PROTO_UNIX)
|
||||
seq_puts(m, ",proto=unix");
|
||||
if (v9ses->extended == 0)
|
||||
seq_puts(m, ",noextend");
|
||||
if (v9ses->nodev == 1)
|
||||
seq_puts(m, ",nodevmap");
|
||||
seq_printf(m, ",name=%s", v9ses->name);
|
||||
seq_printf(m, ",aname=%s", v9ses->remotename);
|
||||
seq_printf(m, ",uid=%u", v9ses->uid);
|
||||
seq_printf(m, ",gid=%u", v9ses->gid);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct super_operations v9fs_super_ops = {
|
||||
.statfs = simple_statfs,
|
||||
.clear_inode = v9fs_clear_inode,
|
||||
.show_options = v9fs_show_options,
|
||||
};
|
||||
|
||||
struct file_system_type v9fs_fs_type = {
|
||||
.name = "9P",
|
||||
.get_sb = v9fs_get_sb,
|
||||
.kill_sb = v9fs_kill_super,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user