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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * refcounttree.h
   5  *
   6  * Copyright (C) 2009 Oracle.  All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public
  10  * License version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17 #ifndef OCFS2_REFCOUNTTREE_H
  18 #define OCFS2_REFCOUNTTREE_H
  19
  20 struct ocfs2_refcount_tree {
  21         struct rb_node rf_node;
  22         u64 rf_blkno;
  23         u32 rf_generation;
  24         struct rw_semaphore rf_sem;
  25         struct ocfs2_lock_res rf_lockres;
  26         struct kref rf_getcnt;
  27         int rf_removed;
  28
  29         /* the following 4 fields are used by caching_info. */
  30         struct ocfs2_caching_info rf_ci;
  31         spinlock_t rf_lock;
  32         struct mutex rf_io_mutex;
  33         struct super_block *rf_sb;
  34 };
  35
  36 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
  37 int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
  38                              struct ocfs2_refcount_tree **tree,
  39                              struct buffer_head **ref_bh);
  40 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
  41                                 struct ocfs2_refcount_tree *tree,
  42                                 int rw);
  43
  44 int ocfs2_decrease_refcount(struct inode *inode,
  45                             handle_t *handle, u32 cpos, u32 len,
  46                             struct ocfs2_alloc_context *meta_ac,
  47                             struct ocfs2_cached_dealloc_ctxt *dealloc);
  48 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
  49                                           struct buffer_head *di_bh,
  50                                           u64 phys_blkno,
  51                                           u32 clusters,
  52                                           int *credits,
  53                                           struct ocfs2_alloc_context **meta_ac);
  54 #endif /* OCFS2_REFCOUNTTREE_H */