1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * slotmap.h
5 *
6 * description here
7 *
8 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26
27#ifndef SLOTMAP_H
28#define SLOTMAP_H
29
30struct ocfs2_slot_info {
31	spinlock_t si_lock;
32
33       	struct inode *si_inode;
34	struct buffer_head *si_bh;
35	unsigned int si_num_slots;
36	unsigned int si_size;
37	s16 si_global_node_nums[OCFS2_MAX_SLOTS];
38};
39
40int ocfs2_init_slot_info(struct ocfs2_super *osb);
41void ocfs2_free_slot_info(struct ocfs2_slot_info *si);
42
43int ocfs2_find_slot(struct ocfs2_super *osb);
44void ocfs2_put_slot(struct ocfs2_super *osb);
45
46void ocfs2_update_slot_info(struct ocfs2_slot_info *si);
47int ocfs2_update_disk_slots(struct ocfs2_super *osb,
48			    struct ocfs2_slot_info *si);
49
50s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
51			   s16 global);
52void ocfs2_clear_slot(struct ocfs2_slot_info *si,
53		      s16 slot_num);
54
55void ocfs2_populate_mounted_map(struct ocfs2_super *osb);
56
57static inline int ocfs2_is_empty_slot(struct ocfs2_slot_info *si,
58				      int slot_num)
59{
60	BUG_ON(slot_num == OCFS2_INVALID_SLOT);
61	assert_spin_locked(&si->si_lock);
62
63	return si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT;
64}
65
66#endif
67