fs/ocfs2/suballoc.h

   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                                  is 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_ */