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 struct btrfs_root;
   8 enum btrfs_reserve_flush_enum;
   9
  10 /*
  11  * Types of block reserves
  12  */
  13 enum btrfs_rsv_type {
  14         BTRFS_BLOCK_RSV_GLOBAL,
  15         BTRFS_BLOCK_RSV_DELALLOC,
  16         BTRFS_BLOCK_RSV_TRANS,
  17         BTRFS_BLOCK_RSV_CHUNK,
  18         BTRFS_BLOCK_RSV_DELOPS,
  19         BTRFS_BLOCK_RSV_DELREFS,
  20         BTRFS_BLOCK_RSV_EMPTY,
  21         BTRFS_BLOCK_RSV_TEMP,
  22 };
  23
  24 struct btrfs_block_rsv {
  25         u64 size;
  26         u64 reserved;
  27         struct btrfs_space_info *space_info;
  28         spinlock_t lock;
  29         bool full;
  30         bool failfast;
  31         /* Block reserve type, one of BTRFS_BLOCK_RSV_* */
  32         enum btrfs_rsv_type type:8;
  33
  34         /*
  35          * Qgroup equivalent for @size @reserved
  36          *
  37          * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
  38          * about things like csum size nor how many tree blocks it will need to
  39          * reserve.
  40          *
  41          * Qgroup cares more about net change of the extent usage.
  42          *
  43          * So for one newly inserted file extent, in worst case it will cause
  44          * leaf split and level increase, nodesize for each file extent is
  45          * already too much.
  46          *
  47          * In short, qgroup_size/reserved is the upper limit of possible needed
  48          * qgroup metadata reservation.
  49          */
  50         u64 qgroup_rsv_size;
  51         u64 qgroup_rsv_reserved;
  52 };
  53
  54 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, enum btrfs_rsv_type type);
  55 void btrfs_init_root_block_rsv(struct btrfs_root *root);
  56 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
  57                                               enum btrfs_rsv_type type);
  58 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
  59                                    struct btrfs_block_rsv *rsv,
  60                                    enum btrfs_rsv_type type);
  61 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
  62                           struct btrfs_block_rsv *rsv);
  63 int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info,
  64                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
  65                         enum btrfs_reserve_flush_enum flush);
  66 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_percent);
  67 int btrfs_block_rsv_refill(struct btrfs_fs_info *fs_info,
  68                            struct btrfs_block_rsv *block_rsv, u64 num_bytes,
  69                            enum btrfs_reserve_flush_enum flush);
  70 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
  71                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
  72                             bool update_size);
  73 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
  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 /*
  94  * Fast path to check if the reserve is full, may be carefully used outside of
  95  * locks.
  96  */
  97 static inline bool btrfs_block_rsv_full(const struct btrfs_block_rsv *rsv)
  98 {
  99         return data_race(rsv->full);
 100 }
 101
 102 #endif /* BTRFS_BLOCK_RSV_H */