ia64/linux-2.6.18-xen.hg

view fs/ocfs2/suballoc.h @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 */
26 #ifndef _CHAINALLOC_H_
27 #define _CHAINALLOC_H_
29 typedef int (group_search_t)(struct inode *,
30 struct buffer_head *,
31 u32,
32 u32,
33 u16 *,
34 u16 *);
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_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 struct ocfs2_journal_handle *ac_handle;
48 /* these are used by the chain search */
49 u16 ac_chain;
50 int ac_allow_chain_relink;
51 group_search_t *ac_group_search;
53 u64 ac_last_group;
54 };
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)
58 {
59 return ac->ac_bits_wanted - ac->ac_bits_given;
60 }
62 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
63 struct ocfs2_journal_handle *handle,
64 struct ocfs2_dinode *fe,
65 struct ocfs2_alloc_context **ac);
66 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
67 struct ocfs2_journal_handle *handle,
68 struct ocfs2_alloc_context **ac);
69 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
70 struct ocfs2_journal_handle *handle,
71 u32 bits_wanted,
72 struct ocfs2_alloc_context **ac);
74 int ocfs2_claim_metadata(struct ocfs2_super *osb,
75 struct ocfs2_journal_handle *handle,
76 struct ocfs2_alloc_context *ac,
77 u32 bits_wanted,
78 u16 *suballoc_bit_start,
79 u32 *num_bits,
80 u64 *blkno_start);
81 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
82 struct ocfs2_journal_handle *handle,
83 struct ocfs2_alloc_context *ac,
84 u16 *suballoc_bit,
85 u64 *fe_blkno);
86 int ocfs2_claim_clusters(struct ocfs2_super *osb,
87 struct ocfs2_journal_handle *handle,
88 struct ocfs2_alloc_context *ac,
89 u32 min_clusters,
90 u32 *cluster_start,
91 u32 *num_clusters);
93 int ocfs2_free_dinode(struct ocfs2_journal_handle *handle,
94 struct inode *inode_alloc_inode,
95 struct buffer_head *inode_alloc_bh,
96 struct ocfs2_dinode *di);
97 int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle,
98 struct inode *eb_alloc_inode,
99 struct buffer_head *eb_alloc_bh,
100 struct ocfs2_extent_block *eb);
101 int ocfs2_free_clusters(struct ocfs2_journal_handle *handle,
102 struct inode *bitmap_inode,
103 struct buffer_head *bitmap_bh,
104 u64 start_blk,
105 unsigned int num_clusters);
107 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
108 u64 bg_blkno)
109 {
110 /* This should work for all block group descriptors as only
111 * the 1st group descriptor of the cluster bitmap is
112 * different. */
114 if (bg_blkno == osb->first_cluster_group_blkno)
115 return 0;
117 /* the rest of the block groups are located at the beginning
118 * of their 1st cluster, so a direct translation just
119 * works. */
120 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
121 }
123 static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
124 {
125 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
126 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
127 }
129 /* This is for local alloc ONLY. Others should use the task-specific
130 * apis above. */
131 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
132 struct ocfs2_alloc_context *ac);
134 #endif /* _CHAINALLOC_H_ */