1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * suballoc.h
5 *
6 * Defines sub allocator api
7 *
8 * Copyright (C) 2003, 2004 Oracle.  All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#ifndef _CHAINALLOC_H_
27#define _CHAINALLOC_H_
28
29typedef int (group_search_t)(struct inode *,
30			     struct buffer_head *,
31			     u32,
32			     u32,
33			     u16 *,
34			     u16 *);
35
36struct ocfs2_alloc_context {
37	struct inode *ac_inode;    /* which bitmap are we allocating from? */
38	struct buffer_head *ac_bh; /* file entry bh */
39	u32    ac_bits_wanted;
40	u32    ac_bits_given;
41#define OCFS2_AC_USE_LOCAL 1
42#define OCFS2_AC_USE_MAIN  2
43#define OCFS2_AC_USE_INODE 3
44#define OCFS2_AC_USE_META  4
45	u32    ac_which;
46
47	/* these are used by the chain search */
48	u16    ac_chain;
49	int    ac_allow_chain_relink;
50	group_search_t *ac_group_search;
51
52	u64    ac_last_group;
53};
54
55void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
56static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
57{
58	return ac->ac_bits_wanted - ac->ac_bits_given;
59}
60
61int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
62			       struct ocfs2_dinode *fe,
63			       struct ocfs2_alloc_context **ac);
64int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
65			    struct ocfs2_alloc_context **ac);
66int ocfs2_reserve_clusters(struct ocfs2_super *osb,
67			   u32 bits_wanted,
68			   struct ocfs2_alloc_context **ac);
69
70int ocfs2_claim_metadata(struct ocfs2_super *osb,
71			 handle_t *handle,
72			 struct ocfs2_alloc_context *ac,
73			 u32 bits_wanted,
74			 u16 *suballoc_bit_start,
75			 u32 *num_bits,
76			 u64 *blkno_start);
77int ocfs2_claim_new_inode(struct ocfs2_super *osb,
78			  handle_t *handle,
79			  struct ocfs2_alloc_context *ac,
80			  u16 *suballoc_bit,
81			  u64 *fe_blkno);
82int ocfs2_claim_clusters(struct ocfs2_super *osb,
83			 handle_t *handle,
84			 struct ocfs2_alloc_context *ac,
85			 u32 min_clusters,
86			 u32 *cluster_start,
87			 u32 *num_clusters);
88
89int ocfs2_free_dinode(handle_t *handle,
90		      struct inode *inode_alloc_inode,
91		      struct buffer_head *inode_alloc_bh,
92		      struct ocfs2_dinode *di);
93int ocfs2_free_extent_block(handle_t *handle,
94			    struct inode *eb_alloc_inode,
95			    struct buffer_head *eb_alloc_bh,
96			    struct ocfs2_extent_block *eb);
97int ocfs2_free_clusters(handle_t *handle,
98			struct inode *bitmap_inode,
99			struct buffer_head *bitmap_bh,
100			u64 start_blk,
101			unsigned int num_clusters);
102
103static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
104					  u64 bg_blkno)
105{
106	/* This should work for all block group descriptors as only
107	 * the 1st group descriptor of the cluster bitmap is
108	 * different. */
109
110	if (bg_blkno == osb->first_cluster_group_blkno)
111		return 0;
112
113	/* the rest of the block groups are located at the beginning
114	 * of their 1st cluster, so a direct translation just
115	 * works. */
116	return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
117}
118
119static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
120{
121	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
122	return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
123}
124
125/* This is for local alloc ONLY. Others should use the task-specific
126 * apis above. */
127int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
128				      struct ocfs2_alloc_context *ac);
129
130#endif /* _CHAINALLOC_H_ */
131