Root/fs/ocfs2/refcounttree.h

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
20struct 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
36void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
37int 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);
40void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
41                struct ocfs2_refcount_tree *tree,
42                int rw);
43
44int 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);
49int 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);
55int 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
59typedef 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 */
69struct ocfs2_post_refcount {
70    int credits; /* credits it need for journal. */
71    ocfs2_post_refcount_func *func; /* real function. */
72    void *para;
73};
74
75int 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);
80int 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);
87int 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);
91int 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);
95int ocfs2_cow_sync_writeback(struct super_block *sb,
96                 struct inode *inode,
97                 u32 cpos, u32 num_clusters);
98int 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);
105int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
106int ocfs2_try_remove_refcount_tree(struct inode *inode,
107                   struct buffer_head *di_bh);
108int 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);
114int 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

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