blob: 9983ba1570e20073bb45e3d8e47f78e320afe1a5 [file] [log] [blame]
Tao Ma8dec98e2009-08-18 11:19:58 +08001/* -*- 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
Tao Ma374a2632009-08-24 11:13:37 +080036void 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);
Tao Ma1823cb02009-08-18 11:24:49 +080043
44int ocfs2_decrease_refcount(struct inode *inode,
45 handle_t *handle, u32 cpos, u32 len,
46 struct ocfs2_alloc_context *meta_ac,
Tao Ma6ae23c52009-08-18 11:30:55 +080047 struct ocfs2_cached_dealloc_ctxt *dealloc,
48 int delete);
Tao Mabcbbb242009-08-18 11:29:12 +080049int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
Tristan Ye78f94672010-05-11 17:54:42 +080050 u64 refcount_loc,
Tao Mabcbbb242009-08-18 11:29:12 +080051 u64 phys_blkno,
52 u32 clusters,
53 int *credits,
Tristan Ye78f94672010-05-11 17:54:42 +080054 int *ref_blocks);
Tao Ma6f70fa52009-08-25 08:05:12 +080055int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +080056 u32 cpos, u32 write_len, u32 max_cpos);
Tao Ma492a8a32009-08-18 11:43:17 +080057
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);
Tao Ma01292412009-09-21 13:04:19 +080086int 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);
Tao Ma8b2c0db2009-08-18 11:43:49 +080093int 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);
Tao Ma2999d122009-08-18 11:43:55 +080096int 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);
Tao Mabd508732009-09-21 11:25:14 +0800102int ocfs2_reflink_ioctl(struct inode *inode,
103 const char __user *oldname,
104 const char __user *newname,
105 bool preserve);
Tao Ma8dec98e2009-08-18 11:19:58 +0800106#endif /* OCFS2_REFCOUNTTREE_H */