1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* -*- mode: c; c-basic-offset: 8; -*- 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * suballoc.h 6 * 7 * Defines sub allocator api 8 * 9 * Copyright (C) 2003, 2004 Oracle. All rights reserved. 10 */ 11 12 #ifndef _CHAINALLOC_H_ 13 #define _CHAINALLOC_H_ 14 15 struct ocfs2_suballoc_result; 16 typedef int (group_search_t)(struct inode *, 17 struct buffer_head *, 18 u32, /* bits_wanted */ 19 u32, /* min_bits */ 20 u64, /* max_block */ 21 struct ocfs2_suballoc_result *); 22 /* found bits */ 23 24 struct ocfs2_alloc_context { 25 struct inode *ac_inode; /* which bitmap are we allocating from? */ 26 struct buffer_head *ac_bh; /* file entry bh */ 27 u32 ac_alloc_slot; /* which slot are we allocating from? */ 28 u32 ac_bits_wanted; 29 u32 ac_bits_given; 30 #define OCFS2_AC_USE_LOCAL 1 31 #define OCFS2_AC_USE_MAIN 2 32 #define OCFS2_AC_USE_INODE 3 33 #define OCFS2_AC_USE_META 4 34 u32 ac_which; 35 36 /* these are used by the chain search */ 37 u16 ac_chain; 38 int ac_disable_chain_relink; 39 group_search_t *ac_group_search; 40 41 u64 ac_last_group; 42 u64 ac_max_block; /* Highest block number to allocate. 0 is 43 the same as ~0 - unlimited */ 44 45 int ac_find_loc_only; /* hack for reflink operation ordering */ 46 struct ocfs2_suballoc_result *ac_find_loc_priv; /* */ 47 48 struct ocfs2_alloc_reservation *ac_resv; 49 }; 50 51 void ocfs2_init_steal_slots(struct ocfs2_super *osb); 52 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); 53 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) 54 { 55 return ac->ac_bits_wanted - ac->ac_bits_given; 56 } 57 58 /* 59 * Please note that the caller must make sure that root_el is the root 60 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 61 * the result may be wrong. 62 */ 63 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 64 struct ocfs2_extent_list *root_el, 65 struct ocfs2_alloc_context **ac); 66 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, 67 int blocks, 68 struct ocfs2_alloc_context **ac); 69 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 70 struct ocfs2_alloc_context **ac); 71 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 72 u32 bits_wanted, 73 struct ocfs2_alloc_context **ac); 74 75 int ocfs2_alloc_dinode_update_counts(struct inode *inode, 76 handle_t *handle, 77 struct buffer_head *di_bh, 78 u32 num_bits, 79 u16 chain); 80 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode, 81 struct buffer_head *di_bh, 82 u32 num_bits, 83 u16 chain); 84 int ocfs2_block_group_set_bits(handle_t *handle, 85 struct inode *alloc_inode, 86 struct ocfs2_group_desc *bg, 87 struct buffer_head *group_bh, 88 unsigned int bit_off, 89 unsigned int num_bits); 90 91 int ocfs2_claim_metadata(handle_t *handle, 92 struct ocfs2_alloc_context *ac, 93 u32 bits_wanted, 94 u64 *suballoc_loc, 95 u16 *suballoc_bit_start, 96 u32 *num_bits, 97 u64 *blkno_start); 98 int ocfs2_claim_new_inode(handle_t *handle, 99 struct inode *dir, 100 struct buffer_head *parent_fe_bh, 101 struct ocfs2_alloc_context *ac, 102 u64 *suballoc_loc, 103 u16 *suballoc_bit, 104 u64 *fe_blkno); 105 int ocfs2_claim_clusters(handle_t *handle, 106 struct ocfs2_alloc_context *ac, 107 u32 min_clusters, 108 u32 *cluster_start, 109 u32 *num_clusters); 110 /* 111 * Use this variant of ocfs2_claim_clusters to specify a maxiumum 112 * number of clusters smaller than the allocation reserved. 113 */ 114 int __ocfs2_claim_clusters(handle_t *handle, 115 struct ocfs2_alloc_context *ac, 116 u32 min_clusters, 117 u32 max_clusters, 118 u32 *cluster_start, 119 u32 *num_clusters); 120 121 int ocfs2_free_suballoc_bits(handle_t *handle, 122 struct inode *alloc_inode, 123 struct buffer_head *alloc_bh, 124 unsigned int start_bit, 125 u64 bg_blkno, 126 unsigned int count); 127 int ocfs2_free_dinode(handle_t *handle, 128 struct inode *inode_alloc_inode, 129 struct buffer_head *inode_alloc_bh, 130 struct ocfs2_dinode *di); 131 int ocfs2_free_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 int ocfs2_release_clusters(handle_t *handle, 137 struct inode *bitmap_inode, 138 struct buffer_head *bitmap_bh, 139 u64 start_blk, 140 unsigned int num_clusters); 141 142 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 143 { 144 u64 group = block - (u64) bit; 145 146 return group; 147 } 148 149 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 150 u64 bg_blkno) 151 { 152 /* This should work for all block group descriptors as only 153 * the 1st group descriptor of the cluster bitmap is 154 * different. */ 155 156 if (bg_blkno == osb->first_cluster_group_blkno) 157 return 0; 158 159 /* the rest of the block groups are located at the beginning 160 * of their 1st cluster, so a direct translation just 161 * works. */ 162 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 163 } 164 165 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 166 { 167 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 168 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 169 } 170 171 /* This is for local alloc ONLY. Others should use the task-specific 172 * apis above. */ 173 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 174 struct ocfs2_alloc_context *ac); 175 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); 176 177 /* given a cluster offset, calculate which block group it belongs to 178 * and return that block offset. */ 179 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); 180 181 /* 182 * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it 183 * finds a problem. A caller that wants to check a group descriptor 184 * without going readonly should read the block with ocfs2_read_block[s]() 185 * and then checking it with this function. This is only resize, really. 186 * Everyone else should be using ocfs2_read_group_descriptor(). 187 */ 188 int ocfs2_check_group_descriptor(struct super_block *sb, 189 struct ocfs2_dinode *di, 190 struct buffer_head *bh); 191 /* 192 * Read a group descriptor block into *bh. If *bh is NULL, a bh will be 193 * allocated. This is a cached read. The descriptor will be validated with 194 * ocfs2_validate_group_descriptor(). 195 */ 196 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, 197 u64 gd_blkno, struct buffer_head **bh); 198 199 int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, 200 u32 clusters_to_add, u32 extents_to_split, 201 struct ocfs2_alloc_context **data_ac, 202 struct ocfs2_alloc_context **meta_ac); 203 204 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); 205 206 207 208 /* 209 * The following two interfaces are for ocfs2_create_inode_in_orphan(). 210 */ 211 int ocfs2_find_new_inode_loc(struct inode *dir, 212 struct buffer_head *parent_fe_bh, 213 struct ocfs2_alloc_context *ac, 214 u64 *fe_blkno); 215 216 int ocfs2_claim_new_inode_at_loc(handle_t *handle, 217 struct inode *dir, 218 struct ocfs2_alloc_context *ac, 219 u64 *suballoc_loc, 220 u16 *suballoc_bit, 221 u64 di_blkno); 222 223 #endif /* _CHAINALLOC_H_ */ 224