Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932623AbWJGFze (ORCPT ); Sat, 7 Oct 2006 01:55:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932615AbWJGFzG (ORCPT ); Sat, 7 Oct 2006 01:55:06 -0400 Received: from filer.fsl.cs.sunysb.edu ([130.245.126.2]:54960 "EHLO filer.fsl.cs.sunysb.edu") by vger.kernel.org with ESMTP id S932605AbWJGFyz (ORCPT ); Sat, 7 Oct 2006 01:54:55 -0400 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 3 of 23] Unionfs: Branch management functionality Message-Id: <283be70922a4ed04834a.1160197642@thor.fsl.cs.sunysb.edu> In-Reply-To: Date: Sat, 07 Oct 2006 01:07:22 -0400 From: Josef "Jeff" Sipek To: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, torvalds@osdl.org, akpm@osdl.org, hch@infradead.org, viro@ftp.linux.org.uk Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2829 Lines: 99 From: Josef "Jeff" Sipek This patch contains the ioctls to increase the union generation and to query which branch a file exists on. Signed-off-by: Josef "Jeff" Sipek Signed-off-by: David Quigley Signed-off-by: Erez Zadok --- 1 file changed, 74 insertions(+) fs/unionfs/branchman.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++ diff -r 3104d077379c -r 283be70922a4 fs/unionfs/branchman.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/fs/unionfs/branchman.c Sat Oct 07 00:46:18 2006 -0400 @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2003-2006 Erez Zadok + * Copyright (c) 2003-2006 Charles P. Wright + * Copyright (c) 2005-2006 Josef 'Jeff' Sipek + * Copyright (c) 2005-2006 Junjiro Okajima + * Copyright (c) 2005 Arun M. Krishnakumar + * Copyright (c) 2004-2006 David P. Quigley + * Copyright (c) 2003-2004 Mohammad Nayyer Zubair + * Copyright (c) 2003 Puja Gupta + * Copyright (c) 2003 Harikesavan Krishnan + * Copyright (c) 2003-2006 Stony Brook University + * Copyright (c) 2003-2006 The Research Foundation of State University of New York + * + * 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. + */ + +#include "union.h" + +int unionfs_ioctl_incgen(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct super_block *sb; + int gen; + + sb = file->f_dentry->d_sb; + + unionfs_write_lock(sb); + + gen = atomic_inc_return(&stopd(sb)->usi_generation); + + atomic_set(&dtopd(sb->s_root)->udi_generation, gen); + atomic_set(&itopd(sb->s_root->d_inode)->uii_generation, gen); + + unionfs_write_unlock(sb); + + return gen; +} + +int unionfs_ioctl_queryfile(struct file *file, unsigned int cmd, + unsigned long arg) +{ + int err = 0; + fd_set branchlist; + + int bstart = 0, bend = 0, bindex = 0; + struct dentry *dentry, *hidden_dentry; + + dentry = file->f_dentry; + lock_dentry(dentry); + if ((err = unionfs_partial_lookup(dentry))) + goto out; + bstart = dbstart(dentry); + bend = dbend(dentry); + + FD_ZERO(&branchlist); + + for (bindex = bstart; bindex <= bend; bindex++) { + hidden_dentry = dtohd_index(dentry, bindex); + if (!hidden_dentry) + continue; + if (hidden_dentry->d_inode) + FD_SET(bindex, &branchlist); + } + + err = copy_to_user((void __user *)arg, &branchlist, sizeof(fd_set)); + if (err) + err = -EFAULT; + +out: + unlock_dentry(dentry); + return err < 0 ? err : bend; +} + - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/