/*
drbd_actlog.c
This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
Copyright (C) 2003-2008, LINBIT Information Technologies GmbH.
Copyright (C) 2003-2008, Philipp Reisner <philipp.reisner@linbit.com>.
Copyright (C) 2003-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
drbd 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, or (at your option)
any later version.
drbd 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 drbd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/slab.h>
#include <linux/drbd.h>
#include "drbd_int.h"
#include "drbd_tracing.h"
#include "drbd_wrappers.h"
/* We maintain a trivial check sum in our on disk activity log.
* With that we can ensure correct operation even when the storage
* device might do a partial (last) sector write while loosing power.
*/
struct __packed al_transaction {
u32 magic;
u32 tr_number;
struct __packed {
u32 pos;
u32 extent; } updates[1 + AL_EXTENTS_PT];
u32 xor_sum;
};
struct update_odbm_work {
struct drbd_work w;
unsigned int enr;
};
struct update_al_work {
struct drbd_work w;
struct lc_element *al_ext;
struct completion event;
unsigned int enr;
/* if old_enr != LC_FREE, write corresponding bitmap sector, too */</