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 */
119