| Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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 | |
| 29 | typedef int (group_search_t)(struct inode *, |
| 30 | struct buffer_head *, |
| 31 | u32, |
| 32 | u32, |
| 33 | u16 *, |
| 34 | u16 *); |
| 35 | |
| 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; |
| 47 | |
| 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; |
| 52 | }; |
| 53 | |
| 54 | void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); |
| 55 | static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) |
| 56 | { |
| 57 | return ac->ac_bits_wanted - ac->ac_bits_given; |
| 58 | } |
| 59 | |
| 60 | int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, |
| 61 | struct ocfs2_journal_handle *handle, |
| 62 | struct ocfs2_dinode *fe, |
| 63 | struct ocfs2_alloc_context **ac); |
| 64 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, |
| 65 | struct ocfs2_journal_handle *handle, |
| 66 | struct ocfs2_alloc_context **ac); |
| 67 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, |
| 68 | struct ocfs2_journal_handle *handle, |
| 69 | u32 bits_wanted, |
| 70 | struct ocfs2_alloc_context **ac); |
| 71 | |
| 72 | int ocfs2_claim_metadata(struct ocfs2_super *osb, |
| 73 | struct ocfs2_journal_handle *handle, |
| 74 | struct ocfs2_alloc_context *ac, |
| 75 | u32 bits_wanted, |
| 76 | u16 *suballoc_bit_start, |
| 77 | u32 *num_bits, |
| 78 | u64 *blkno_start); |
| 79 | int ocfs2_claim_new_inode(struct ocfs2_super *osb, |
| 80 | struct ocfs2_journal_handle *handle, |
| 81 | struct ocfs2_alloc_context *ac, |
| 82 | u16 *suballoc_bit, |
| 83 | u64 *fe_blkno); |
| 84 | int ocfs2_claim_clusters(struct ocfs2_super *osb, |
| 85 | struct ocfs2_journal_handle *handle, |
| 86 | struct ocfs2_alloc_context *ac, |
| 87 | u32 min_clusters, |
| 88 | u32 *cluster_start, |
| 89 | u32 *num_clusters); |
| 90 | |
| 91 | int ocfs2_free_dinode(struct ocfs2_journal_handle *handle, |
| 92 | struct inode *inode_alloc_inode, |
| 93 | struct buffer_head *inode_alloc_bh, |
| 94 | struct ocfs2_dinode *di); |
| 95 | int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle, |
| 96 | struct inode *eb_alloc_inode, |
| 97 | struct buffer_head *eb_alloc_bh, |
| 98 | struct ocfs2_extent_block *eb); |
| 99 | int ocfs2_free_clusters(struct ocfs2_journal_handle *handle, |
| 100 | struct inode *bitmap_inode, |
| 101 | struct buffer_head *bitmap_bh, |
| 102 | u64 start_blk, |
| 103 | unsigned int num_clusters); |
| 104 | |
| 105 | static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, |
| 106 | u64 bg_blkno) |
| 107 | { |
| 108 | /* This should work for all block group descriptors as only |
| 109 | * the 1st group descriptor of the cluster bitmap is |
| 110 | * different. */ |
| 111 | |
| 112 | if (bg_blkno == osb->first_cluster_group_blkno) |
| 113 | return 0; |
| 114 | |
| 115 | /* the rest of the block groups are located at the beginning |
| 116 | * of their 1st cluster, so a direct translation just |
| 117 | * works. */ |
| 118 | return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); |
| 119 | } |
| 120 | |
| 121 | static inline int ocfs2_is_cluster_bitmap(struct inode *inode) |
| 122 | { |
| 123 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 124 | return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; |
| 125 | } |
| 126 | |
| 127 | /* This is for local alloc ONLY. Others should use the task-specific |
| 128 | * apis above. */ |
| 129 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, |
| 130 | struct ocfs2_alloc_context *ac); |
| 131 | |
| 132 | #endif /* _CHAINALLOC_H_ */ |