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 kref rf_getcnt;
25	struct rw_semaphore rf_sem;
26	struct ocfs2_lock_res rf_lockres;
27	int rf_removed;
28
29	/* the following 4 fields are used by caching_info. */
30	spinlock_t rf_lock;
31	struct ocfs2_caching_info rf_ci;
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,
56		       struct buffer_head *di_bh,
57		       u32 cpos, u32 write_len, u32 max_cpos);
58
59typedef int (ocfs2_post_refcount_func)(struct inode *inode,
60				       handle_t *handle,
61				       void *para);
62/*
63 * Some refcount caller need to do more work after we modify the data b-tree
64 * during refcount operation(including CoW and add refcount flag), and make the
65 * transaction complete. So it must give us this structure so that we can do it
66 * within our transaction.
67 *
68 */
69struct ocfs2_post_refcount {
70	int credits;			/* credits it need for journal. */
71	ocfs2_post_refcount_func *func;	/* real function. */
72	void *para;
73};
74
75int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
76				       struct ocfs2_caching_info *ref_ci,
77				       struct buffer_head *ref_root_bh,
78				       struct ocfs2_xattr_value_root *xv,
79				       int *meta_add, int *credits);
80int ocfs2_refcount_cow_xattr(struct inode *inode,
81			     struct ocfs2_dinode *di,
82			     struct ocfs2_xattr_value_buf *vb,
83			     struct ocfs2_refcount_tree *ref_tree,
84			     struct buffer_head *ref_root_bh,
85			     u32 cpos, u32 write_len,
86			     struct ocfs2_post_refcount *post);
87int ocfs2_duplicate_clusters_by_page(handle_t *handle,
88				     struct inode *inode,
89				     u32 cpos, u32 old_cluster,
90				     u32 new_cluster, u32 new_len);
91int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
92				    struct inode *inode,
93				    u32 cpos, u32 old_cluster,
94				    u32 new_cluster, u32 new_len);
95int ocfs2_cow_sync_writeback(struct super_block *sb,
96			     struct inode *inode,
97			     u32 cpos, u32 num_clusters);
98int ocfs2_add_refcount_flag(struct inode *inode,
99			    struct ocfs2_extent_tree *data_et,
100			    struct ocfs2_caching_info *ref_ci,
101			    struct buffer_head *ref_root_bh,
102			    u32 cpos, u32 p_cluster, u32 num_clusters,
103			    struct ocfs2_cached_dealloc_ctxt *dealloc,
104			    struct ocfs2_post_refcount *post);
105int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
106int ocfs2_try_remove_refcount_tree(struct inode *inode,
107				   struct buffer_head *di_bh);
108int ocfs2_increase_refcount(handle_t *handle,
109			    struct ocfs2_caching_info *ci,
110			    struct buffer_head *ref_root_bh,
111			    u64 cpos, u32 len,
112			    struct ocfs2_alloc_context *meta_ac,
113			    struct ocfs2_cached_dealloc_ctxt *dealloc);
114int ocfs2_reflink_ioctl(struct inode *inode,
115			const char __user *oldname,
116			const char __user *newname,
117			bool preserve);
118#endif /* OCFS2_REFCOUNTTREE_H */
119