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, /* bits_wanted */ 32 u32, /* min_bits */ 33 u64, /* max_block */ 34 u16 *, /* *bit_off */ 35 u16 *); /* *bits_found */ 36 37 struct ocfs2_alloc_context { 38 struct inode *ac_inode; /* which bitmap are we allocating from? */ 39 struct buffer_head *ac_bh; /* file entry bh */ 40 u32 ac_alloc_slot; /* which slot are we allocating from? */ 41 u32 ac_bits_wanted; 42 u32 ac_bits_given; 43 #define OCFS2_AC_USE_LOCAL 1 44 #define OCFS2_AC_USE_MAIN 2 45 #define OCFS2_AC_USE_INODE 3 46 #define OCFS2_AC_USE_META 4 47 u32 ac_which; 48 49 /* these are used by the chain search */ 50 u16 ac_chain; 51 int ac_allow_chain_relink; 52 group_search_t *ac_group_search; 53 54 u64 ac_last_group; 55 u64 ac_max_block; /* Highest block number to allocate. 0 is 56 is the same as ~0 - unlimited */ 57 }; 58 59 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); 60 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) 61 { 62 return ac->ac_bits_wanted - ac->ac_bits_given; 63 } 64 65 /* 66 * Please note that the caller must make sure that root_el is the root 67 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 68 * the result may be wrong. 69 */ 70 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 71 struct ocfs2_extent_list *root_el, 72 struct ocfs2_alloc_context **ac); 73 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, 74 int blocks, 75 struct ocfs2_alloc_context **ac); 76 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 77 struct ocfs2_alloc_context **ac); 78 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 79 u32 bits_wanted, 80 struct ocfs2_alloc_context **ac); 81 82 int ocfs2_claim_metadata(struct ocfs2_super *osb, 83 handle_t *handle, 84 struct ocfs2_alloc_context *ac, 85 u32 bits_wanted, 86 u16 *suballoc_bit_start, 87 u32 *num_bits, 88 u64 *blkno_start); 89 int ocfs2_claim_new_inode(struct ocfs2_super *osb, 90 handle_t *handle, 91 struct inode *dir, 92 struct buffer_head *parent_fe_bh, 93 struct ocfs2_alloc_context *ac, 94 u16 *suballoc_bit, 95 u64 *fe_blkno); 96 int ocfs2_claim_clusters(struct ocfs2_super *osb, 97 handle_t *handle, 98 struct ocfs2_alloc_context *ac, 99 u32 min_clusters, 100 u32 *cluster_start, 101 u32 *num_clusters); 102 /* 103 * Use this variant of ocfs2_claim_clusters to specify a maxiumum 104 * number of clusters smaller than the allocation reserved. 105 */ 106 int __ocfs2_claim_clusters(struct ocfs2_super *osb, 107 handle_t *handle, 108 struct ocfs2_alloc_context *ac, 109 u32 min_clusters, 110 u32 max_clusters, 111 u32 *cluster_start, 112 u32 *num_clusters); 113 114 int ocfs2_free_suballoc_bits(handle_t *handle, 115 struct inode *alloc_inode, 116 struct buffer_head *alloc_bh, 117 unsigned int start_bit, 118 u64 bg_blkno, 119 unsigned int count); 120 int ocfs2_free_dinode(handle_t *handle, 121 struct inode *inode_alloc_inode, 122 struct buffer_head *inode_alloc_bh, 123 struct ocfs2_dinode *di); 124 int ocfs2_free_clusters(handle_t *handle, 125 struct inode *bitmap_inode, 126 struct buffer_head *bitmap_bh, 127 u64 start_blk, 128 unsigned int num_clusters); 129 130 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 131 { 132 u64 group = block - (u64) bit; 133 134 return group; 135 } 136 137 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 138 u64 bg_blkno) 139 { 140 /* This should work for all block group descriptors as only 141 * the 1st group descriptor of the cluster bitmap is 142 * different. */ 143 144 if (bg_blkno == osb->first_cluster_group_blkno) 145 return 0; 146 147 /* the rest of the block groups are located at the beginning 148 * of their 1st cluster, so a direct translation just 149 * works. */ 150 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 151 } 152 153 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 154 { 155 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 156 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 157 } 158 159 /* This is for local alloc ONLY. Others should use the task-specific 160 * apis above. */ 161 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 162 struct ocfs2_alloc_context *ac); 163 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); 164 165 /* given a cluster offset, calculate which block group it belongs to 166 * and return that block offset. */ 167 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); 168 169 /* 170 * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it 171 * finds a problem. A caller that wants to check a group descriptor 172 * without going readonly should read the block with ocfs2_read_block[s]() 173 * and then checking it with this function. This is only resize, really. 174 * Everyone else should be using ocfs2_read_group_descriptor(). 175 */ 176 int ocfs2_check_group_descriptor(struct super_block *sb, 177 struct ocfs2_dinode *di, 178 struct buffer_head *bh); 179 /* 180 * Read a group descriptor block into *bh. If *bh is NULL, a bh will be 181 * allocated. This is a cached read. The descriptor will be validated with 182 * ocfs2_validate_group_descriptor(). 183 */ 184 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, 185 u64 gd_blkno, struct buffer_head **bh); 186 187 int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, 188 u32 clusters_to_add, u32 extents_to_split, 189 struct ocfs2_alloc_context **data_ac, 190 struct ocfs2_alloc_context **meta_ac); 191 192 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); 193 #endif /* _CHAINALLOC_H_ */ 194