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
20struct 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
36void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
37int 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);
40void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
41				struct ocfs2_refcount_tree *tree,
42				int rw);
43
44int 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 delete);
49int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
50					  u64 refcount_loc,
51					  u64 phys_blkno,
52					  u32 clusters,
53					  int *credits,
54					  int *ref_blocks);
55int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh,
56		       u32 cpos, u32 write_len, u32 max_cpos);
57
58typedef int (ocfs2_post_refcount_func)(struct inode *inode,
59				       handle_t *handle,
60				       void *para);
61/*
62 * Some refcount caller need to do more work after we modify the data b-tree
63 * during refcount operation(including CoW and add refcount flag), and make the
64 * transaction complete. So it must give us this structure so that we can do it
65 * within our transaction.
66 *
67 */
68struct ocfs2_post_refcount {
69	int credits;			/* credits it need for journal. */
70	ocfs2_post_refcount_func *func;	/* real function. */
71	void *para;
72};
73
74int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
75				       struct ocfs2_caching_info *ref_ci,
76				       struct buffer_head *ref_root_bh,
77				       struct ocfs2_xattr_value_root *xv,
78				       int *meta_add, int *credits);
79int ocfs2_refcount_cow_xattr(struct inode *inode,
80			     struct ocfs2_dinode *di,
81			     struct ocfs2_xattr_value_buf *vb,
82			     struct ocfs2_refcount_tree *ref_tree,
83			     struct buffer_head *ref_root_bh,
84			     u32 cpos, u32 write_len,
85			     struct ocfs2_post_refcount *post);
86int ocfs2_add_refcount_flag(struct inode *inode,
87			    struct ocfs2_extent_tree *data_et,
88			    struct ocfs2_caching_info *ref_ci,
89			    struct buffer_head *ref_root_bh,
90			    u32 cpos, u32 p_cluster, u32 num_clusters,
91			    struct ocfs2_cached_dealloc_ctxt *dealloc,
92			    struct ocfs2_post_refcount *post);
93int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
94int ocfs2_try_remove_refcount_tree(struct inode *inode,
95				   struct buffer_head *di_bh);
96int ocfs2_increase_refcount(handle_t *handle,
97			    struct ocfs2_caching_info *ci,
98			    struct buffer_head *ref_root_bh,
99			    u64 cpos, u32 len,
100			    struct ocfs2_alloc_context *meta_ac,
101			    struct ocfs2_cached_dealloc_ctxt *dealloc);
102int ocfs2_reflink_ioctl(struct inode *inode,
103			const char __user *oldname,
104			const char __user *newname,
105			bool preserve);
106#endif /* OCFS2_REFCOUNTTREE_H */
107