1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
7 * Copyright (C) 2009 Oracle. All rights reserved.
9 #ifndef OCFS2_REFCOUNTTREE_H
10 #define OCFS2_REFCOUNTTREE_H
12 struct ocfs2_refcount_tree {
13 struct rb_node rf_node;
16 struct kref rf_getcnt;
17 struct rw_semaphore rf_sem;
18 struct ocfs2_lock_res rf_lockres;
21 /* the following 4 fields are used by caching_info. */
23 struct ocfs2_caching_info rf_ci;
24 struct mutex rf_io_mutex;
25 struct super_block *rf_sb;
28 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
29 int 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);
32 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
33 struct ocfs2_refcount_tree *tree,
36 int 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,
41 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
47 int ocfs2_refcount_cow(struct inode *inode,
48 struct buffer_head *di_bh,
49 u32 cpos, u32 write_len, u32 max_cpos);
51 typedef int (ocfs2_post_refcount_func)(struct inode *inode,
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.
61 struct ocfs2_post_refcount {
62 int credits; /* credits it need for journal. */
63 ocfs2_post_refcount_func *func; /* real function. */
67 int 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);
72 int 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);
79 int ocfs2_duplicate_clusters_by_page(handle_t *handle,
81 u32 cpos, u32 old_cluster,
82 u32 new_cluster, u32 new_len);
83 int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
85 u32 cpos, u32 old_cluster,
86 u32 new_cluster, u32 new_len);
87 int ocfs2_cow_sync_writeback(struct super_block *sb,
89 u32 cpos, u32 num_clusters);
90 int 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);
97 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
98 int ocfs2_try_remove_refcount_tree(struct inode *inode,
99 struct buffer_head *di_bh);
100 int ocfs2_increase_refcount(handle_t *handle,
101 struct ocfs2_caching_info *ci,
102 struct buffer_head *ref_root_bh,
104 struct ocfs2_alloc_context *meta_ac,
105 struct ocfs2_cached_dealloc_ctxt *dealloc);
106 int ocfs2_reflink_ioctl(struct inode *inode,
107 const char __user *oldname,
108 const char __user *newname,
110 loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
111 struct buffer_head *s_bh,
113 struct inode *t_inode,
114 struct buffer_head *t_bh,
117 int ocfs2_reflink_inodes_lock(struct inode *s_inode,
118 struct buffer_head **bh1,
119 struct inode *t_inode,
120 struct buffer_head **bh2);
121 void 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);
125 int ocfs2_reflink_update_dest(struct inode *dest,
126 struct buffer_head *d_bh,
129 #endif /* OCFS2_REFCOUNTTREE_H */