fs/ocfs2/slot_map.h

   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
  30 struct 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
  40 int ocfs2_init_slot_info(struct ocfs2_super *osb);
  41 void ocfs2_free_slot_info(struct ocfs2_slot_info *si);
  42
  43 int ocfs2_find_slot(struct ocfs2_super *osb);
  44 void ocfs2_put_slot(struct ocfs2_super *osb);
  45
  46 void ocfs2_update_slot_info(struct ocfs2_slot_info *si);
  47 int ocfs2_update_disk_slots(struct ocfs2_super *osb,
  48                             struct ocfs2_slot_info *si);
  49
  50 s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
  51                            s16 global);
  52 void ocfs2_clear_slot(struct ocfs2_slot_info *si,
  53                       s16 slot_num);
  54
  55 static inline int ocfs2_is_empty_slot(struct ocfs2_slot_info *si,
  56                                       int slot_num)
  57 {
  58         BUG_ON(slot_num == OCFS2_INVALID_SLOT);
  59         assert_spin_locked(&si->si_lock);
  60
  61         return si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT;
  62 }
  63
  64 #endif