projects/linux·blob master · refs

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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 */