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 
10 struct 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 
26 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
27 int 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);
30 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
31 				struct ocfs2_refcount_tree *tree,
32 				int rw);
33 
34 int 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);
39 int 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);
45 int ocfs2_refcount_cow(struct inode *inode,
46 		       struct buffer_head *di_bh,
47 		       u32 cpos, u32 write_len, u32 max_cpos);
48 
49 typedef 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  */
59 struct ocfs2_post_refcount {
60 	int credits;			/* credits it need for journal. */
61 	ocfs2_post_refcount_func *func;	/* real function. */
62 	void *para;
63 };
64 
65 int 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);
70 int 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);
77 int 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);
81 int 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);
85 int ocfs2_cow_sync_writeback(struct super_block *sb,
86 			     struct inode *inode,
87 			     u32 cpos, u32 num_clusters);
88 int 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);
95 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
96 int ocfs2_try_remove_refcount_tree(struct inode *inode,
97 				   struct buffer_head *di_bh);
98 int 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);
104 int ocfs2_reflink_ioctl(struct inode *inode,
105 			const char __user *oldname,
106 			const char __user *newname,
107 			bool preserve);
108 loff_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);
115 int ocfs2_reflink_inodes_lock(struct inode *s_inode,
116 			      struct buffer_head **bh1,
117 			      struct inode *t_inode,
118 			      struct buffer_head **bh2);
119 void 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);
123 int ocfs2_reflink_update_dest(struct inode *dest,
124 			      struct buffer_head *d_bh,
125 			      loff_t newlen);
126 
127 #endif /* OCFS2_REFCOUNTTREE_H */
128