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 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 55 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); 56 static 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 61 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 62 struct ocfs2_dinode *fe, 63 struct ocfs2_alloc_context **ac); 64 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 65 struct ocfs2_alloc_context **ac); 66 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 67 u32 bits_wanted, 68 struct ocfs2_alloc_context **ac); 69 70 int 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); 77 int 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); 82 int 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 89 int ocfs2_free_suballoc_bits(handle_t *handle, 90 struct inode *alloc_inode, 91 struct buffer_head *alloc_bh, 92 unsigned int start_bit, 93 u64 bg_blkno, 94 unsigned int count); 95 int ocfs2_free_dinode(handle_t *handle, 96 struct inode *inode_alloc_inode, 97 struct buffer_head *inode_alloc_bh, 98 struct ocfs2_dinode *di); 99 int ocfs2_free_clusters(handle_t *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 u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 106 { 107 u64 group = block - (u64) bit; 108 109 return group; 110 } 111 112 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 113 u64 bg_blkno) 114 { 115 /* This should work for all block group descriptors as only 116 * the 1st group descriptor of the cluster bitmap is 117 * different. */ 118 119 if (bg_blkno == osb->first_cluster_group_blkno) 120 return 0; 121 122 /* the rest of the block groups are located at the beginning 123 * of their 1st cluster, so a direct translation just 124 * works. */ 125 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 126 } 127 128 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 129 { 130 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 131 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 132 } 133 134 /* This is for local alloc ONLY. Others should use the task-specific 135 * apis above. */ 136 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 137 struct ocfs2_alloc_context *ac); 138 139 #endif /* _CHAINALLOC_H_ */ 140