1/* SPDX-License-Identifier: GPL-2.0-only */
2/* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * refcounttree.h
6 *
7 * Copyright (C) 2009 Oracle.  All rights reserved.
8 */
9#ifndef OCFS2_REFCOUNTTREE_H
10#define OCFS2_REFCOUNTTREE_H
11
12struct ocfs2_refcount_tree {
13	struct rb_node rf_node;
14	u64 rf_blkno;
15	u32 rf_generation;
16	struct kref rf_getcnt;
17	struct rw_semaphore rf_sem;
18	struct ocfs2_lock_res rf_lockres;
19	int rf_removed;
20
21	/* the following 4 fields are used by caching_info. */
22	spinlock_t rf_lock;
23	struct ocfs2_caching_info rf_ci;
24	struct mutex rf_io_mutex;
25	struct super_block *rf_sb;
26};
27
28void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
29int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
30			     struct ocfs2_refcount_tree **tree,
31			     struct buffer_head **ref_bh);
32void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
33				struct ocfs2_refcount_tree *tree,
34				int rw);
35
36int ocfs2_decrease_refcount(struct inode *inode,
37			    handle_t *handle, u32 cpos, u32 len,
38			    struct ocfs2_alloc_context *meta_ac,
39			    struct ocfs2_cached_dealloc_ctxt *dealloc,
40			    int delete);
41int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
42					  u64 refcount_loc,
43					  u64 phys_blkno,
44					  u32 clusters,
45					  int *credits,
46					  int *ref_blocks);
47int ocfs2_refcount_cow(struct inode *inode,
48		       struct buffer_head *di_bh,
49		       u32 cpos, u32 write_len, u32 max_cpos);
50
51typedef int (ocfs2_post_refcount_func)(struct inode *inode,
52				       handle_t *handle,
53				       void *para);
54/*
55 * Some refcount caller need to do more work after we modify the data b-tree
56 * during refcount operation(including CoW and add refcount flag), and make the
57 * transaction complete. So it must give us this structure so that we can do it
58 * within our transaction.
59 *
60 */
61struct ocfs2_post_refcount {
62	int credits;			/* credits it need for journal. */
63	ocfs2_post_refcount_func *func;	/* real function. */
64	void *para;
65};
66
67int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
68				       struct ocfs2_caching_info *ref_ci,
69				       struct buffer_head *ref_root_bh,
70				       struct ocfs2_xattr_value_root *xv,
71				       int *meta_add, int *credits);
72int ocfs2_refcount_cow_xattr(struct inode *inode,
73			     struct ocfs2_dinode *di,
74			     struct ocfs2_xattr_value_buf *vb,
75			     struct ocfs2_refcount_tree *ref_tree,
76			     struct buffer_head *ref_root_bh,
77			     u32 cpos, u32 write_len,
78			     struct ocfs2_post_refcount *post);
79int ocfs2_duplicate_clusters_by_page(handle_t *handle,
80				     struct inode *inode,
81				     u32 cpos, u32 old_cluster,
82				     u32 new_cluster, u32 new_len);
83int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
84				    struct inode *inode,
85				    u32 cpos, u32 old_cluster,
86				    u32 new_cluster, u32 new_len);
87int ocfs2_cow_sync_writeback(struct super_block *sb,
88			     struct inode *inode,
89			     u32 cpos, u32 num_clusters);
90int ocfs2_add_refcount_flag(struct inode *inode,
91			    struct ocfs2_extent_tree *data_et,
92			    struct ocfs2_caching_info *ref_ci,
93			    struct buffer_head *ref_root_bh,
94			    u32 cpos, u32 p_cluster, u32 num_clusters,
95			    struct ocfs2_cached_dealloc_ctxt *dealloc,
96			    struct ocfs2_post_refcount *post);
97int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
98int ocfs2_try_remove_refcount_tree(struct inode *inode,
99				   struct buffer_head *di_bh);
100int ocfs2_increase_refcount(handle_t *handle,
101			    struct ocfs2_caching_info *ci,
102			    struct buffer_head *ref_root_bh,
103			    u64 cpos, u32 len,
104			    struct ocfs2_alloc_context *meta_ac,
105			    struct ocfs2_cached_dealloc_ctxt *dealloc);
106int ocfs2_reflink_ioctl(struct inode *inode,
107			const char __user *oldname,
108			const char __user *newname,
109			bool preserve);
110loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
111				  struct buffer_head *s_bh,
112				  loff_t pos_in,
113				  struct inode *t_inode,
114				  struct buffer_head *t_bh,
115				  loff_t pos_out,
116				  loff_t len);
117int ocfs2_reflink_inodes_lock(struct inode *s_inode,
118			      struct buffer_head **bh1,
119			      struct inode *t_inode,
120			      struct buffer_head **bh2);
121void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
122				 struct buffer_head *s_bh,
123				 struct inode *t_inode,
124				 struct buffer_head *t_bh);
125int ocfs2_reflink_update_dest(struct inode *dest,
126			      struct buffer_head *d_bh,
127			      loff_t newlen);
128
129#endif /* OCFS2_REFCOUNTTREE_H */
130