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 rw_semaphore rf_sem;
25    struct ocfs2_lock_res rf_lockres;
26    struct kref rf_getcnt;
27    int rf_removed;
28
29    /* the following 4 fields are used by caching_info. */
30    struct ocfs2_caching_info rf_ci;
31    spinlock_t rf_lock;
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                      struct buffer_head *di_bh,
51                      u64 phys_blkno,
52                      u32 clusters,
53                      int *credits,
54                      struct ocfs2_alloc_context **meta_ac);
55int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh,
56               u32 cpos, u32 write_len, u32 max_cpos);
57
58typedef int (ocfs2_post_refcount_func)(struct inode *inode,
59                       handle_t *handle,
60                       void *para);
61/*
62 * Some refcount caller need to do more work after we modify the data b-tree
63 * during refcount operation(including CoW and add refcount flag), and make the
64 * transaction complete. So it must give us this structure so that we can do it
65 * within our transaction.
66 *
67 */
68struct ocfs2_post_refcount {
69    int credits; /* credits it need for journal. */
70    ocfs2_post_refcount_func *func; /* real function. */
71    void *para;
72};
73
74int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
75                       struct ocfs2_caching_info *ref_ci,
76                       struct buffer_head *ref_root_bh,
77                       struct ocfs2_xattr_value_root *xv,
78                       int *meta_add, int *credits);
79int ocfs2_refcount_cow_xattr(struct inode *inode,
80                 struct ocfs2_dinode *di,
81                 struct ocfs2_xattr_value_buf *vb,
82                 struct ocfs2_refcount_tree *ref_tree,
83                 struct buffer_head *ref_root_bh,
84                 u32 cpos, u32 write_len,
85                 struct ocfs2_post_refcount *post);
86int ocfs2_add_refcount_flag(struct inode *inode,
87                struct ocfs2_extent_tree *data_et,
88                struct ocfs2_caching_info *ref_ci,
89                struct buffer_head *ref_root_bh,
90                u32 cpos, u32 p_cluster, u32 num_clusters,
91                struct ocfs2_cached_dealloc_ctxt *dealloc,
92                struct ocfs2_post_refcount *post);
93int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
94int ocfs2_try_remove_refcount_tree(struct inode *inode,
95                   struct buffer_head *di_bh);
96int ocfs2_increase_refcount(handle_t *handle,
97                struct ocfs2_caching_info *ci,
98                struct buffer_head *ref_root_bh,
99                u64 cpos, u32 len,
100                struct ocfs2_alloc_context *meta_ac,
101                struct ocfs2_cached_dealloc_ctxt *dealloc);
102int ocfs2_reflink_ioctl(struct inode *inode,
103            const char __user *oldname,
104            const char __user *newname,
105            bool preserve);
106#endif /* OCFS2_REFCOUNTTREE_H */
107

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