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 struct ocfs2_suballoc_result; 30 typedef int (group_search_t)(struct inode *, 31 struct buffer_head *, 32 u32, /* bits_wanted */ 33 u32, /* min_bits */ 34 u64, /* max_block */ 35 struct ocfs2_suballoc_result *); 36 /* found bits */ 37 38 struct ocfs2_alloc_context { 39 struct inode *ac_inode; /* which bitmap are we allocating from? */ 40 struct buffer_head *ac_bh; /* file entry bh */ 41 u32 ac_alloc_slot; /* which slot are we allocating from? */ 42 u32 ac_bits_wanted; 43 u32 ac_bits_given; 44 #define OCFS2_AC_USE_LOCAL 1 45 #define OCFS2_AC_USE_MAIN 2 46 #define OCFS2_AC_USE_INODE 3 47 #define OCFS2_AC_USE_META 4 48 u32 ac_which; 49 50 /* these are used by the chain search */ 51 u16 ac_chain; 52 int ac_allow_chain_relink; 53 group_search_t *ac_group_search; 54 55 u64 ac_last_group; 56 u64 ac_max_block; /* Highest block number to allocate. 0 is 57 is the same as ~0 - unlimited */ 58 59 struct ocfs2_alloc_reservation *ac_resv; 60 }; 61 62 void ocfs2_init_steal_slots(struct ocfs2_super *osb); 63 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); 64 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) 65 { 66 return ac->ac_bits_wanted - ac->ac_bits_given; 67 } 68 69 /* 70 * Please note that the caller must make sure that root_el is the root 71 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 72 * the result may be wrong. 73 */ 74 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 75 struct ocfs2_extent_list *root_el, 76 struct ocfs2_alloc_context **ac); 77 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, 78 int blocks, 79 struct ocfs2_alloc_context **ac); 80 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 81 struct ocfs2_alloc_context **ac); 82 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 83 u32 bits_wanted, 84 struct ocfs2_alloc_context **ac); 85 86 int ocfs2_claim_metadata(handle_t *handle, 87 struct ocfs2_alloc_context *ac, 88 u32 bits_wanted, 89 u64 *suballoc_loc, 90 u16 *suballoc_bit_start, 91 u32 *num_bits, 92 u64 *blkno_start); 93 int ocfs2_claim_new_inode(handle_t *handle, 94 struct inode *dir, 95 struct buffer_head *parent_fe_bh, 96 struct ocfs2_alloc_context *ac, 97 u64 *suballoc_loc, 98 u16 *suballoc_bit, 99 u64 *fe_blkno); 100 int ocfs2_claim_clusters(handle_t *handle, 101 struct ocfs2_alloc_context *ac, 102 u32 min_clusters, 103 u32 *cluster_start, 104 u32 *num_clusters); 105 /* 106 * Use this variant of ocfs2_claim_clusters to specify a maxiumum 107 * number of clusters smaller than the allocation reserved. 108 */ 109 int __ocfs2_claim_clusters(handle_t *handle, 110 struct ocfs2_alloc_context *ac, 111 u32 min_clusters, 112 u32 max_clusters, 113 u32 *cluster_start, 114 u32 *num_clusters); 115 116 int ocfs2_free_suballoc_bits(handle_t *handle, 117 struct inode *alloc_inode, 118 struct buffer_head *alloc_bh, 119 unsigned int start_bit, 120 u64 bg_blkno, 121 unsigned int count); 122 int ocfs2_free_dinode(handle_t *handle, 123 struct inode *inode_alloc_inode, 124 struct buffer_head *inode_alloc_bh, 125 struct ocfs2_dinode *di); 126 int ocfs2_free_clusters(handle_t *handle, 127 struct inode *bitmap_inode, 128 struct buffer_head *bitmap_bh, 129 u64 start_blk, 130 unsigned int num_clusters); 131 int ocfs2_release_clusters(handle_t *handle, 132 struct inode *bitmap_inode, 133 struct buffer_head *bitmap_bh, 134 u64 start_blk, 135 unsigned int num_clusters); 136 137 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 138 { 139 u64 group = block - (u64) bit; 140 141 return group; 142 } 143 144 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 145 u64 bg_blkno) 146 { 147 /* This should work for all block group descriptors as only 148 * the 1st group descriptor of the cluster bitmap is 149 * different. */ 150 151 if (bg_blkno == osb->first_cluster_group_blkno) 152 return 0; 153 154 /* the rest of the block groups are located at the beginning 155 * of their 1st cluster, so a direct translation just 156 * works. */ 157 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 158 } 159 160 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 161 { 162 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 163 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 164 } 165 166 /* This is for local alloc ONLY. Others should use the task-specific 167 * apis above. */ 168 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 169 struct ocfs2_alloc_context *ac); 170 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); 171 172 /* given a cluster offset, calculate which block group it belongs to 173 * and return that block offset. */ 174 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); 175 176 /* 177 * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it 178 * finds a problem. A caller that wants to check a group descriptor 179 * without going readonly should read the block with ocfs2_read_block[s]() 180 * and then checking it with this function. This is only resize, really. 181 * Everyone else should be using ocfs2_read_group_descriptor(). 182 */ 183 int ocfs2_check_group_descriptor(struct super_block *sb, 184 struct ocfs2_dinode *di, 185 struct buffer_head *bh); 186 /* 187 * Read a group descriptor block into *bh. If *bh is NULL, a bh will be 188 * allocated. This is a cached read. The descriptor will be validated with 189 * ocfs2_validate_group_descriptor(). 190 */ 191 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, 192 u64 gd_blkno, struct buffer_head **bh); 193 194 int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, 195 u32 clusters_to_add, u32 extents_to_split, 196 struct ocfs2_alloc_context **data_ac, 197 struct ocfs2_alloc_context **meta_ac); 198 199 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); 200 #endif /* _CHAINALLOC_H_ */ 201