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refcounttree.h
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1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * refcounttree.h
5  *
6  * Copyright (C) 2009 Oracle. All rights reserved.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public
10  * License version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * General Public License for more details.
16  */
17 #ifndef OCFS2_REFCOUNTTREE_H
18 #define OCFS2_REFCOUNTTREE_H
19 
20 struct ocfs2_refcount_tree {
21  struct rb_node rf_node;
22  u64 rf_blkno;
23  u32 rf_generation;
24  struct kref rf_getcnt;
25  struct rw_semaphore rf_sem;
26  struct ocfs2_lock_res rf_lockres;
27  int rf_removed;
28 
29  /* the following 4 fields are used by caching_info. */
30  spinlock_t rf_lock;
31  struct ocfs2_caching_info rf_ci;
32  struct mutex rf_io_mutex;
33  struct super_block *rf_sb;
34 };
35 
36 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
37 int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
38  struct ocfs2_refcount_tree **tree,
39  struct buffer_head **ref_bh);
40 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
41  struct ocfs2_refcount_tree *tree,
42  int rw);
43 
44 int ocfs2_decrease_refcount(struct inode *inode,
45  handle_t *handle, u32 cpos, u32 len,
46  struct ocfs2_alloc_context *meta_ac,
47  struct ocfs2_cached_dealloc_ctxt *dealloc,
48  int delete);
49 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
50  u64 refcount_loc,
51  u64 phys_blkno,
52  u32 clusters,
53  int *credits,
54  int *ref_blocks);
55 int ocfs2_refcount_cow(struct inode *inode,
56  struct file *filep, struct buffer_head *di_bh,
57  u32 cpos, u32 write_len, u32 max_cpos);
58 
59 typedef int (ocfs2_post_refcount_func)(struct inode *inode,
60  handle_t *handle,
61  void *para);
62 /*
63  * Some refcount caller need to do more work after we modify the data b-tree
64  * during refcount operation(including CoW and add refcount flag), and make the
65  * transaction complete. So it must give us this structure so that we can do it
66  * within our transaction.
67  *
68  */
69 struct ocfs2_post_refcount {
70  int credits; /* credits it need for journal. */
71  ocfs2_post_refcount_func *func; /* real function. */
72  void *para;
73 };
74 
75 int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
76  struct ocfs2_caching_info *ref_ci,
77  struct buffer_head *ref_root_bh,
78  struct ocfs2_xattr_value_root *xv,
79  int *meta_add, int *credits);
80 int ocfs2_refcount_cow_xattr(struct inode *inode,
81  struct ocfs2_dinode *di,
82  struct ocfs2_xattr_value_buf *vb,
83  struct ocfs2_refcount_tree *ref_tree,
84  struct buffer_head *ref_root_bh,
85  u32 cpos, u32 write_len,
86  struct ocfs2_post_refcount *post);
87 int ocfs2_duplicate_clusters_by_page(handle_t *handle,
88  struct file *file,
89  u32 cpos, u32 old_cluster,
90  u32 new_cluster, u32 new_len);
91 int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
92  struct file *file,
93  u32 cpos, u32 old_cluster,
94  u32 new_cluster, u32 new_len);
95 int ocfs2_cow_sync_writeback(struct super_block *sb,
96  struct inode *inode,
97  u32 cpos, u32 num_clusters);
98 int ocfs2_add_refcount_flag(struct inode *inode,
99  struct ocfs2_extent_tree *data_et,
100  struct ocfs2_caching_info *ref_ci,
101  struct buffer_head *ref_root_bh,
102  u32 cpos, u32 p_cluster, u32 num_clusters,
103  struct ocfs2_cached_dealloc_ctxt *dealloc,
104  struct ocfs2_post_refcount *post);
105 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
106 int ocfs2_try_remove_refcount_tree(struct inode *inode,
107  struct buffer_head *di_bh);
108 int ocfs2_increase_refcount(handle_t *handle,
109  struct ocfs2_caching_info *ci,
110  struct buffer_head *ref_root_bh,
111  u64 cpos, u32 len,
112  struct ocfs2_alloc_context *meta_ac,
113  struct ocfs2_cached_dealloc_ctxt *dealloc);
114 int ocfs2_reflink_ioctl(struct inode *inode,
115  const char __user *oldname,
116  const char __user *newname,
117  bool preserve);
118 #endif /* OCFS2_REFCOUNTTREE_H */
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