linux-stable/fs/ocfs2/slot_map.h
Joel Becker fc881fa0d5 ocfs2: De-magic the in-memory slot map.
The in-memory slot map uses the same magic as the on-disk one.  There is
a special value to mark a slot as invalid.  It relies on the size of
certain types and so on.

Write a new in-memory map that keeps validity as a separate field.  Outside
of the I/O functions, OCFS2_INVALID_SLOT now means what it is supposed to.
It also is no longer tied to the type size.

This also means that only the I/O functions refer to 16bit quantities.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2008-04-18 08:56:03 -07:00

44 lines
1.4 KiB
C

/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* slotmap.h
*
* description here
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* 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 021110-1307, USA.
*/
#ifndef SLOTMAP_H
#define SLOTMAP_H
int ocfs2_init_slot_info(struct ocfs2_super *osb);
void ocfs2_free_slot_info(struct ocfs2_super *osb);
int ocfs2_find_slot(struct ocfs2_super *osb);
void ocfs2_put_slot(struct ocfs2_super *osb);
int ocfs2_refresh_slot_info(struct ocfs2_super *osb);
int ocfs2_node_num_to_slot(struct ocfs2_super *osb, unsigned int node_num);
int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
unsigned int *node_num);
int ocfs2_clear_slot(struct ocfs2_super *osb, int slot_num);
#endif