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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 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 | |
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 | struct buffer_head *di_bh, |
51 | u64 phys_blkno, |
52 | u32 clusters, |
53 | int *credits, |
54 | struct ocfs2_alloc_context **meta_ac); |
55 | int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh, |
56 | u32 cpos, u32 write_len, u32 max_cpos); |
57 | |
58 | typedef 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 | */ |
68 | struct ocfs2_post_refcount { |
69 | int credits; /* credits it need for journal. */ |
70 | ocfs2_post_refcount_func *func; /* real function. */ |
71 | void *para; |
72 | }; |
73 | |
74 | int 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); |
79 | int 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); |
86 | int 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); |
93 | int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh); |
94 | int ocfs2_try_remove_refcount_tree(struct inode *inode, |
95 | struct buffer_head *di_bh); |
96 | int 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); |
102 | int 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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