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*
* FL-COW by Davide Libenzi ( File Links Copy On Write )
* Copyright (C) 2003 Davide Libenzi
*
* 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 the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Davide Libenzi <davidel@xmailserver.org>
*
The preload library perform Copy On Write on files having hard links.
The environment variable FLCOW_PATH tells the library which paths are
allowed to be FL-COWed. For example :
FLCOW_PATH=/home/davide/arch-projects/:/home/davide/test-flcow/
Anything that is inside :
/home/davide/arch-projects/*
and inside /home/davide/test-flcow/*
will be FL-COWed if its st_nlink > 1. To have the library effective
you simply set your FLCOW_PATH :
export FLCOW_PATH=...
and you also set :
export LD_PRELOAD=$LD_PRELOAD:/usr/lib/libflcow.so
I usually export this in my developer shell. To test the library after
a build you can use :
$ LD_PRELOAD=./fl-cow/.libs/libflcow.so ./test/flcow-test
Or simply :
$ make check
Enjoy,
Davide
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