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_alloc_slot; /* which slot are we allocating from? */ 40 u32 ac_bits_wanted; 41 u32 ac_bits_given; 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 46 u32 ac_which; 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 u64 ac_last_group; 54 }; 55 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 } 61 62 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 63 struct ocfs2_dinode *fe, 64 struct ocfs2_alloc_context **ac); 65 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 66 struct ocfs2_alloc_context **ac); 67 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 68 u32 bits_wanted, 69 struct ocfs2_alloc_context **ac); 70 71 int ocfs2_claim_metadata(struct ocfs2_super *osb, 72 handle_t *handle, 73 struct ocfs2_alloc_context *ac, 74 u32 bits_wanted, 75 u16 *suballoc_bit_start, 76 u32 *num_bits, 77 u64 *blkno_start); 78 int ocfs2_claim_new_inode(struct ocfs2_super *osb, 79 handle_t *handle, 80 struct ocfs2_alloc_context *ac, 81 u16 *suballoc_bit, 82 u64 *fe_blkno); 83 int ocfs2_claim_clusters(struct ocfs2_super *osb, 84 handle_t *handle, 85 struct ocfs2_alloc_context *ac, 86 u32 min_clusters, 87 u32 *cluster_start, 88 u32 *num_clusters); 89 /* 90 * Use this variant of ocfs2_claim_clusters to specify a maxiumum 91 * number of clusters smaller than the allocation reserved. 92 */ 93 int __ocfs2_claim_clusters(struct ocfs2_super *osb, 94 handle_t *handle, 95 struct ocfs2_alloc_context *ac, 96 u32 min_clusters, 97 u32 max_clusters, 98 u32 *cluster_start, 99 u32 *num_clusters); 100 101 int ocfs2_free_suballoc_bits(handle_t *handle, 102 struct inode *alloc_inode, 103 struct buffer_head *alloc_bh, 104 unsigned int start_bit, 105 u64 bg_blkno, 106 unsigned int count); 107 int ocfs2_free_dinode(handle_t *handle, 108 struct inode *inode_alloc_inode, 109 struct buffer_head *inode_alloc_bh, 110 struct ocfs2_dinode *di); 111 int ocfs2_free_clusters(handle_t *handle, 112 struct inode *bitmap_inode, 113 struct buffer_head *bitmap_bh, 114 u64 start_blk, 115 unsigned int num_clusters); 116 117 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 118 { 119 u64 group = block - (u64) bit; 120 121 return group; 122 } 123 124 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 125 u64 bg_blkno) 126 { 127 /* This should work for all block group descriptors as only 128 * the 1st group descriptor of the cluster bitmap is 129 * different. */ 130 131 if (bg_blkno == osb->first_cluster_group_blkno) 132 return 0; 133 134 /* the rest of the block groups are located at the beginning 135 * of their 1st cluster, so a direct translation just 136 * works. */ 137 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 138 } 139 140 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 141 { 142 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 143 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 144 } 145 146 /* This is for local alloc ONLY. Others should use the task-specific 147 * apis above. */ 148 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 149 struct ocfs2_alloc_context *ac); 150 151 /* given a cluster offset, calculate which block group it belongs to 152 * and return that block offset. */ 153 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); 154 155 /* somewhat more expensive than our other checks, so use sparingly. */ 156 int ocfs2_check_group_descriptor(struct super_block *sb, 157 struct ocfs2_dinode *di, 158 struct ocfs2_group_desc *gd); 159 #endif /* _CHAINALLOC_H_ */ 160