forked from luck/tmp_suning_uos_patched
1823cb0b9f
Given a physical cpos and length, decrement the refcount in the tree. If the refcount for any portion of the extent goes to zero, that portion is queued for freeing. Signed-off-by: Tao Ma <tao.ma@oracle.com>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* refcounttree.h
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*
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* Copyright (C) 2009 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef OCFS2_REFCOUNTTREE_H
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#define OCFS2_REFCOUNTTREE_H
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struct ocfs2_refcount_tree {
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struct rb_node rf_node;
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u64 rf_blkno;
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u32 rf_generation;
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struct rw_semaphore rf_sem;
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struct ocfs2_lock_res rf_lockres;
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struct kref rf_getcnt;
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int rf_removed;
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/* the following 4 fields are used by caching_info. */
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struct ocfs2_caching_info rf_ci;
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spinlock_t rf_lock;
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struct mutex rf_io_mutex;
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struct super_block *rf_sb;
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};
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void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
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int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
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struct ocfs2_refcount_tree **tree,
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struct buffer_head **ref_bh);
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void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
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struct ocfs2_refcount_tree *tree,
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int rw);
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int ocfs2_decrease_refcount(struct inode *inode,
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handle_t *handle, u32 cpos, u32 len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc);
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#endif /* OCFS2_REFCOUNTTREE_H */
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