Pull pstorev4 into release branch
[sfrench/cifs-2.6.git] / 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
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_add_refcount_flag(struct inode *inode,
88                             struct ocfs2_extent_tree *data_et,
89                             struct ocfs2_caching_info *ref_ci,
90                             struct buffer_head *ref_root_bh,
91                             u32 cpos, u32 p_cluster, u32 num_clusters,
92                             struct ocfs2_cached_dealloc_ctxt *dealloc,
93                             struct ocfs2_post_refcount *post);
94 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
95 int ocfs2_try_remove_refcount_tree(struct inode *inode,
96                                    struct buffer_head *di_bh);
97 int ocfs2_increase_refcount(handle_t *handle,
98                             struct ocfs2_caching_info *ci,
99                             struct buffer_head *ref_root_bh,
100                             u64 cpos, u32 len,
101                             struct ocfs2_alloc_context *meta_ac,
102                             struct ocfs2_cached_dealloc_ctxt *dealloc);
103 int ocfs2_reflink_ioctl(struct inode *inode,
104                         const char __user *oldname,
105                         const char __user *newname,
106                         bool preserve);
107 #endif /* OCFS2_REFCOUNTTREE_H */