1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Defines sub allocator api
8 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
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.
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.
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.
26 #ifndef _CHAINALLOC_H_
27 #define _CHAINALLOC_H_
29 typedef int (group_search_t
)(struct inode
*,
36 struct 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_alloc_slot
; /* which slot are we allocating from? */
42 #define OCFS2_AC_USE_LOCAL 1
43 #define OCFS2_AC_USE_MAIN 2
44 #define OCFS2_AC_USE_INODE 3
45 #define OCFS2_AC_USE_META 4
48 /* these are used by the chain search */
50 int ac_allow_chain_relink
;
51 group_search_t
*ac_group_search
;
56 void ocfs2_free_alloc_context(struct ocfs2_alloc_context
*ac
);
57 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context
*ac
)
59 return ac
->ac_bits_wanted
- ac
->ac_bits_given
;
63 * Please note that the caller must make sure that root_el is the root
64 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
65 * the result may be wrong.
67 int ocfs2_reserve_new_metadata(struct ocfs2_super
*osb
,
68 struct ocfs2_extent_list
*root_el
,
69 struct ocfs2_alloc_context
**ac
);
70 int ocfs2_reserve_new_inode(struct ocfs2_super
*osb
,
71 struct ocfs2_alloc_context
**ac
);
72 int ocfs2_reserve_clusters(struct ocfs2_super
*osb
,
74 struct ocfs2_alloc_context
**ac
);
76 int ocfs2_claim_metadata(struct ocfs2_super
*osb
,
78 struct ocfs2_alloc_context
*ac
,
80 u16
*suballoc_bit_start
,
83 int ocfs2_claim_new_inode(struct ocfs2_super
*osb
,
85 struct ocfs2_alloc_context
*ac
,
88 int ocfs2_claim_clusters(struct ocfs2_super
*osb
,
90 struct ocfs2_alloc_context
*ac
,
95 * Use this variant of ocfs2_claim_clusters to specify a maxiumum
96 * number of clusters smaller than the allocation reserved.
98 int __ocfs2_claim_clusters(struct ocfs2_super
*osb
,
100 struct ocfs2_alloc_context
*ac
,
106 int ocfs2_free_suballoc_bits(handle_t
*handle
,
107 struct inode
*alloc_inode
,
108 struct buffer_head
*alloc_bh
,
109 unsigned int start_bit
,
112 int ocfs2_free_dinode(handle_t
*handle
,
113 struct inode
*inode_alloc_inode
,
114 struct buffer_head
*inode_alloc_bh
,
115 struct ocfs2_dinode
*di
);
116 int ocfs2_free_clusters(handle_t
*handle
,
117 struct inode
*bitmap_inode
,
118 struct buffer_head
*bitmap_bh
,
120 unsigned int num_clusters
);
122 static inline u64
ocfs2_which_suballoc_group(u64 block
, unsigned int bit
)
124 u64 group
= block
- (u64
) bit
;
129 static inline u32
ocfs2_cluster_from_desc(struct ocfs2_super
*osb
,
132 /* This should work for all block group descriptors as only
133 * the 1st group descriptor of the cluster bitmap is
136 if (bg_blkno
== osb
->first_cluster_group_blkno
)
139 /* the rest of the block groups are located at the beginning
140 * of their 1st cluster, so a direct translation just
142 return ocfs2_blocks_to_clusters(osb
->sb
, bg_blkno
);
145 static inline int ocfs2_is_cluster_bitmap(struct inode
*inode
)
147 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
148 return osb
->bitmap_blkno
== OCFS2_I(inode
)->ip_blkno
;
151 /* This is for local alloc ONLY. Others should use the task-specific
153 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super
*osb
,
154 struct ocfs2_alloc_context
*ac
);
155 void ocfs2_free_ac_resource(struct ocfs2_alloc_context
*ac
);
157 /* given a cluster offset, calculate which block group it belongs to
158 * and return that block offset. */
159 u64
ocfs2_which_cluster_group(struct inode
*inode
, u32 cluster
);
161 /* somewhat more expensive than our other checks, so use sparingly. */
162 int ocfs2_check_group_descriptor(struct super_block
*sb
,
163 struct ocfs2_dinode
*di
,
164 struct ocfs2_group_desc
*gd
);
165 int ocfs2_lock_allocators(struct inode
*inode
, struct buffer_head
*root_bh
,
166 struct ocfs2_extent_list
*root_el
,
167 u32 clusters_to_add
, u32 extents_to_split
,
168 struct ocfs2_alloc_context
**data_ac
,
169 struct ocfs2_alloc_context
**meta_ac
);
170 #endif /* _CHAINALLOC_H_ */