Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[linux-btrfs-devel.git] / fs / ocfs2 / refcounttree.h
blob7754608c83a47b1b44425c8f9c5e13a2adc65675
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * refcounttree.h
6 * Copyright (C) 2009 Oracle. All rights reserved.
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.
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.
17 #ifndef OCFS2_REFCOUNTTREE_H
18 #define OCFS2_REFCOUNTTREE_H
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;
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;
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);
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);
59 typedef int (ocfs2_post_refcount_func)(struct inode *inode,
60 handle_t *handle,
61 void *para);
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.
69 struct ocfs2_post_refcount {
70 int credits; /* credits it need for journal. */
71 ocfs2_post_refcount_func *func; /* real function. */
72 void *para;
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 */