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_init_steal_slots(struct ocfs2_super *osb); 60 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); 61 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) 62 { 63 return ac->ac_bits_wanted - ac->ac_bits_given; 64 } 65 66 /* 67 * Please note that the caller must make sure that root_el is the root 68 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 69 * the result may be wrong. 70 */ 71 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 72 struct ocfs2_extent_list *root_el, 73 struct ocfs2_alloc_context **ac); 74 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, 75 int blocks, 76 struct ocfs2_alloc_context **ac); 77 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 78 struct ocfs2_alloc_context **ac); 79 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 80 u32 bits_wanted, 81 struct ocfs2_alloc_context **ac); 82 83 int ocfs2_claim_metadata(struct ocfs2_super *osb, 84 handle_t *handle, 85 struct ocfs2_alloc_context *ac, 86 u32 bits_wanted, 87 u16 *suballoc_bit_start, 88 u32 *num_bits, 89 u64 *blkno_start); 90 int ocfs2_claim_new_inode(struct ocfs2_super *osb, 91 handle_t *handle, 92 struct inode *dir, 93 struct buffer_head *parent_fe_bh, 94 struct ocfs2_alloc_context *ac, 95 u16 *suballoc_bit, 96 u64 *fe_blkno); 97 int ocfs2_claim_clusters(struct ocfs2_super *osb, 98 handle_t *handle, 99 struct ocfs2_alloc_context *ac, 100 u32 min_clusters, 101 u32 *cluster_start, 102 u32 *num_clusters); 103 /* 104 * Use this variant of ocfs2_claim_clusters to specify a maxiumum 105 * number of clusters smaller than the allocation reserved. 106 */ 107 int __ocfs2_claim_clusters(struct ocfs2_super *osb, 108 handle_t *handle, 109 struct ocfs2_alloc_context *ac, 110 u32 min_clusters, 111 u32 max_clusters, 112 u32 *cluster_start, 113 u32 *num_clusters); 114 115 int ocfs2_free_suballoc_bits(handle_t *handle, 116 struct inode *alloc_inode, 117 struct buffer_head *alloc_bh, 118 unsigned int start_bit, 119 u64 bg_blkno, 120 unsigned int count); 121 int ocfs2_free_dinode(handle_t *handle, 122 struct inode *inode_alloc_inode, 123 struct buffer_head *inode_alloc_bh, 124 struct ocfs2_dinode *di); 125 int ocfs2_free_clusters(handle_t *handle, 126 struct inode *bitmap_inode, 127 struct buffer_head *bitmap_bh, 128 u64 start_blk, 129 unsigned int num_clusters); 130 int ocfs2_release_clusters(handle_t *handle, 131 struct inode *bitmap_inode, 132 struct buffer_head *bitmap_bh, 133 u64 start_blk, 134 unsigned int num_clusters); 135 136 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 137 { 138 u64 group = block - (u64) bit; 139 140 return group; 141 } 142 143 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 144 u64 bg_blkno) 145 { 146 /* This should work for all block group descriptors as only 147 * the 1st group descriptor of the cluster bitmap is 148 * different. */ 149 150 if (bg_blkno == osb->first_cluster_group_blkno) 151 return 0; 152 153 /* the rest of the block groups are located at the beginning 154 * of their 1st cluster, so a direct translation just 155 * works. */ 156 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 157 } 158 159 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 160 { 161 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 162 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 163 } 164 165 /* This is for local alloc ONLY. Others should use the task-specific 166 * apis above. */ 167 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 168 struct ocfs2_alloc_context *ac); 169 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); 170 171 /* given a cluster offset, calculate which block group it belongs to 172 * and return that block offset. */ 173 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); 174 175 /* 176 * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it 177 * finds a problem. A caller that wants to check a group descriptor 178 * without going readonly should read the block with ocfs2_read_block[s]() 179 * and then checking it with this function. This is only resize, really. 180 * Everyone else should be using ocfs2_read_group_descriptor(). 181 */ 182 int ocfs2_check_group_descriptor(struct super_block *sb, 183 struct ocfs2_dinode *di, 184 struct buffer_head *bh); 185 /* 186 * Read a group descriptor block into *bh. If *bh is NULL, a bh will be 187 * allocated. This is a cached read. The descriptor will be validated with 188 * ocfs2_validate_group_descriptor(). 189 */ 190 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, 191 u64 gd_blkno, struct buffer_head **bh); 192 193 int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, 194 u32 clusters_to_add, u32 extents_to_split, 195 struct ocfs2_alloc_context **data_ac, 196 struct ocfs2_alloc_context **meta_ac); 197 198 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); 199 #endif /* _CHAINALLOC_H_ */ 200