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