← Back to branch summary

~ubuntu-branches/ubuntu/precise/linux-lowlatency/precise

« back to all changes in this revision

Viewing changes to fs/ocfs2/refcounttree.h

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

Show diffs side-by-side

added added

removed removed

Lines of Context:
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_duplicate_clusters_by_page(handle_t *handle,
 
88
                                     struct file *file,
 
89
                                     u32 cpos, u32 old_cluster,
 
90
                                     u32 new_cluster, u32 new_len);
 
91
int 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);
 
95
int ocfs2_cow_sync_writeback(struct super_block *sb,
 
96
                             struct inode *inode,
 
97
                             u32 cpos, u32 num_clusters);
 
98
int 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);
 
105
int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
 
106
int ocfs2_try_remove_refcount_tree(struct inode *inode,
 
107
                                   struct buffer_head *di_bh);
 
108
int 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);
 
114
int ocfs2_reflink_ioctl(struct inode *inode,
 
115
                        const char __user *oldname,
 
116
                        const char __user *newname,
 
117
                        bool preserve);
 
118
#endif /* OCFS2_REFCOUNTTREE_H */