1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * suballoc.h 4 * 5 * Defines sub allocator api 6 * 7 * Copyright (C) 2003, 2004 Oracle. All rights reserved. 8 */ 9 10 #ifndef _CHAINALLOC_H_ 11 #define _CHAINALLOC_H_ 12 13 struct ocfs2_suballoc_result; 14 typedef int (group_search_t)(struct inode *, 15 struct buffer_head *, 16 u32, /* bits_wanted */ 17 u32, /* min_bits */ 18 u64, /* max_block */ 19 struct ocfs2_suballoc_result *); 20 /* found bits */ 21 22 struct ocfs2_alloc_context { 23 struct inode *ac_inode; /* which bitmap are we allocating from? */ 24 struct buffer_head *ac_bh; /* file entry bh */ 25 u32 ac_alloc_slot; /* which slot are we allocating from? */ 26 u32 ac_bits_wanted; 27 u32 ac_bits_given; 28 #define OCFS2_AC_USE_LOCAL 1 29 #define OCFS2_AC_USE_MAIN 2 30 #define OCFS2_AC_USE_INODE 3 31 #define OCFS2_AC_USE_META 4 32 u32 ac_which; 33 34 /* these are used by the chain search */ 35 u16 ac_chain; 36 int ac_disable_chain_relink; 37 group_search_t *ac_group_search; 38 39 u64 ac_last_group; 40 u64 ac_max_block; /* Highest block number to allocate. 0 is 41 the same as ~0 - unlimited */ 42 43 int ac_find_loc_only; /* hack for reflink operation ordering */ 44 struct ocfs2_suballoc_result *ac_find_loc_priv; /* */ 45 46 struct ocfs2_alloc_reservation *ac_resv; 47 }; 48 49 void ocfs2_init_steal_slots(struct ocfs2_super *osb); 50 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); 51 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) 52 { 53 return ac->ac_bits_wanted - ac->ac_bits_given; 54 } 55 56 /* 57 * Please note that the caller must make sure that root_el is the root 58 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 59 * the result may be wrong. 60 */ 61 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 62 struct ocfs2_extent_list *root_el, 63 struct ocfs2_alloc_context **ac); 64 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, 65 int blocks, 66 struct ocfs2_alloc_context **ac); 67 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 68 struct ocfs2_alloc_context **ac); 69 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 70 u32 bits_wanted, 71 struct ocfs2_alloc_context **ac); 72 73 int ocfs2_alloc_dinode_update_counts(struct inode *inode, 74 handle_t *handle, 75 struct buffer_head *di_bh, 76 u32 num_bits, 77 u16 chain); 78 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode, 79 struct buffer_head *di_bh, 80 u32 num_bits, 81 u16 chain); 82 int ocfs2_block_group_set_bits(handle_t *handle, 83 struct inode *alloc_inode, 84 struct ocfs2_group_desc *bg, 85 struct buffer_head *group_bh, 86 unsigned int bit_off, 87 unsigned int num_bits); 88 89 int ocfs2_claim_metadata(handle_t *handle, 90 struct ocfs2_alloc_context *ac, 91 u32 bits_wanted, 92 u64 *suballoc_loc, 93 u16 *suballoc_bit_start, 94 u32 *num_bits, 95 u64 *blkno_start); 96 int ocfs2_claim_new_inode(handle_t *handle, 97 struct inode *dir, 98 struct buffer_head *parent_fe_bh, 99 struct ocfs2_alloc_context *ac, 100 u64 *suballoc_loc, 101 u16 *suballoc_bit, 102 u64 *fe_blkno); 103 int ocfs2_claim_clusters(handle_t *handle, 104 struct ocfs2_alloc_context *ac, 105 u32 min_clusters, 106 u32 *cluster_start, 107 u32 *num_clusters); 108 /* 109 * Use this variant of ocfs2_claim_clusters to specify a maximum 110 * number of clusters smaller than the allocation reserved. 111 */ 112 int __ocfs2_claim_clusters(handle_t *handle, 113 struct ocfs2_alloc_context *ac, 114 u32 min_clusters, 115 u32 max_clusters, 116 u32 *cluster_start, 117 u32 *num_clusters); 118 119 int ocfs2_free_suballoc_bits(handle_t *handle, 120 struct inode *alloc_inode, 121 struct buffer_head *alloc_bh, 122 unsigned int start_bit, 123 u64 bg_blkno, 124 unsigned int count); 125 int ocfs2_free_dinode(handle_t *handle, 126 struct inode *inode_alloc_inode, 127 struct buffer_head *inode_alloc_bh, 128 struct ocfs2_dinode *di); 129 int ocfs2_free_clusters(handle_t *handle, 130 struct inode *bitmap_inode, 131 struct buffer_head *bitmap_bh, 132 u64 start_blk, 133 unsigned int num_clusters); 134 int ocfs2_release_clusters(handle_t *handle, 135 struct inode *bitmap_inode, 136 struct buffer_head *bitmap_bh, 137 u64 start_blk, 138 unsigned int num_clusters); 139 140 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) 141 { 142 u64 group = block - (u64) bit; 143 144 return group; 145 } 146 147 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, 148 u64 bg_blkno) 149 { 150 /* This should work for all block group descriptors as only 151 * the 1st group descriptor of the cluster bitmap is 152 * different. */ 153 154 if (bg_blkno == osb->first_cluster_group_blkno) 155 return 0; 156 157 /* the rest of the block groups are located at the beginning 158 * of their 1st cluster, so a direct translation just 159 * works. */ 160 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); 161 } 162 163 static inline int ocfs2_is_cluster_bitmap(struct inode *inode) 164 { 165 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 166 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; 167 } 168 169 /* This is for local alloc ONLY. Others should use the task-specific 170 * apis above. */ 171 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 172 struct ocfs2_alloc_context *ac); 173 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); 174 175 /* given a cluster offset, calculate which block group it belongs to 176 * and return that block offset. */ 177 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); 178 179 /* 180 * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it 181 * finds a problem. A caller that wants to check a group descriptor 182 * without going readonly should read the block with ocfs2_read_block[s]() 183 * and then checking it with this function. This is only resize, really. 184 * Everyone else should be using ocfs2_read_group_descriptor(). 185 */ 186 int ocfs2_check_group_descriptor(struct super_block *sb, 187 struct ocfs2_dinode *di, 188 struct buffer_head *bh); 189 /* 190 * Read a group descriptor block into *bh. If *bh is NULL, a bh will be 191 * allocated. This is a cached read. The descriptor will be validated with 192 * ocfs2_validate_group_descriptor(). 193 */ 194 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, 195 u64 gd_blkno, struct buffer_head **bh); 196 197 int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, 198 u32 clusters_to_add, u32 extents_to_split, 199 struct ocfs2_alloc_context **data_ac, 200 struct ocfs2_alloc_context **meta_ac); 201 202 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); 203 204 205 206 /* 207 * The following two interfaces are for ocfs2_create_inode_in_orphan(). 208 */ 209 int ocfs2_find_new_inode_loc(struct inode *dir, 210 struct buffer_head *parent_fe_bh, 211 struct ocfs2_alloc_context *ac, 212 u64 *fe_blkno); 213 214 int ocfs2_claim_new_inode_at_loc(handle_t *handle, 215 struct inode *dir, 216 struct ocfs2_alloc_context *ac, 217 u64 *suballoc_loc, 218 u16 *suballoc_bit, 219 u64 di_blkno); 220 221 #endif /* _CHAINALLOC_H_ */ 222