fs/btrfs/block-rsv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef BTRFS_BLOCK_RSV_H
   4 #define BTRFS_BLOCK_RSV_H
   5
   6 struct btrfs_trans_handle;
   7 enum btrfs_reserve_flush_enum;
   8
   9 /*
  10  * Types of block reserves
  11  */
  12 enum {
  13         BTRFS_BLOCK_RSV_GLOBAL,
  14         BTRFS_BLOCK_RSV_DELALLOC,
  15         BTRFS_BLOCK_RSV_TRANS,
  16         BTRFS_BLOCK_RSV_CHUNK,
  17         BTRFS_BLOCK_RSV_DELOPS,
  18         BTRFS_BLOCK_RSV_DELREFS,
  19         BTRFS_BLOCK_RSV_EMPTY,
  20         BTRFS_BLOCK_RSV_TEMP,
  21 };
  22
  23 struct btrfs_block_rsv {
  24         u64 size;
  25         u64 reserved;
  26         struct btrfs_space_info *space_info;
  27         spinlock_t lock;
  28         unsigned short full;
  29         unsigned short type;
  30         unsigned short failfast;
  31
  32         /*
  33          * Qgroup equivalent for @size @reserved
  34          *
  35          * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
  36          * about things like csum size nor how many tree blocks it will need to
  37          * reserve.
  38          *
  39          * Qgroup cares more about net change of the extent usage.
  40          *
  41          * So for one newly inserted file extent, in worst case it will cause
  42          * leaf split and level increase, nodesize for each file extent is
  43          * already too much.
  44          *
  45          * In short, qgroup_size/reserved is the upper limit of possible needed
  46          * qgroup metadata reservation.
  47          */
  48         u64 qgroup_rsv_size;
  49         u64 qgroup_rsv_reserved;
  50 };
  51
  52 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
  53 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
  54                                               unsigned short type);
  55 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
  56                                    struct btrfs_block_rsv *rsv,
  57                                    unsigned short type);
  58 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
  59                           struct btrfs_block_rsv *rsv);
  60 int btrfs_block_rsv_add(struct btrfs_root *root,
  61                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
  62                         enum btrfs_reserve_flush_enum flush);
  63 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
  64 int btrfs_block_rsv_refill(struct btrfs_root *root,
  65                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
  66                            enum btrfs_reserve_flush_enum flush);
  67 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
  68                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
  69                             bool update_size);
  70 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
  71 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
  72                              struct btrfs_block_rsv *dest, u64 num_bytes,
  73                              int min_factor);
  74 void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
  75                                u64 num_bytes, bool update_size);
  76 u64 btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
  77                               struct btrfs_block_rsv *block_rsv,
  78                               u64 num_bytes, u64 *qgroup_to_release);
  79 void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info);
  80 void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info);
  81 void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info);
  82 struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
  83                                             struct btrfs_root *root,
  84                                             u32 blocksize);
  85 static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info,
  86                                          struct btrfs_block_rsv *block_rsv,
  87                                          u32 blocksize)
  88 {
  89         btrfs_block_rsv_add_bytes(block_rsv, blocksize, false);
  90         btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL);
  91 }
  92
  93 #endif /* BTRFS_BLOCK_RSV_H */