fs/btrfs/space-info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef BTRFS_SPACE_INFO_H
   4 #define BTRFS_SPACE_INFO_H
   5
   6 struct btrfs_space_info {
   7         spinlock_t lock;
   8
   9         u64 total_bytes;        /* total bytes in the space,
  10                                    this doesn't take mirrors into account */
  11         u64 bytes_used;         /* total bytes used,
  12                                    this doesn't take mirrors into account */
  13         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
  14                                    transaction finishes */
  15         u64 bytes_reserved;     /* total bytes the allocator has reserved for
  16                                    current allocations */
  17         u64 bytes_may_use;      /* number of bytes that may be used for
  18                                    delalloc/allocations */
  19         u64 bytes_readonly;     /* total bytes that are read only */
  20         u64 bytes_zone_unusable;        /* total bytes that are unusable until
  21                                            resetting the device zone */
  22
  23         u64 max_extent_size;    /* This will hold the maximum extent size of
  24                                    the space info if we had an ENOSPC in the
  25                                    allocator. */
  26
  27         int clamp;              /* Used to scale our threshold for preemptive
  28                                    flushing. The value is >> clamp, so turns
  29                                    out to be a 2^clamp divisor. */
  30
  31         unsigned int full:1;    /* indicates that we cannot allocate any more
  32                                    chunks for this space */
  33         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
  34
  35         unsigned int flush:1;           /* set if we are trying to make space */
  36
  37         unsigned int force_alloc;       /* set if we need to force a chunk
  38                                            alloc for this space */
  39
  40         u64 disk_used;          /* total bytes used on disk */
  41         u64 disk_total;         /* total bytes on disk, takes mirrors into
  42                                    account */
  43
  44         u64 flags;
  45
  46         struct list_head list;
  47         /* Protected by the spinlock 'lock'. */
  48         struct list_head ro_bgs;
  49         struct list_head priority_tickets;
  50         struct list_head tickets;
  51
  52         /*
  53          * Size of space that needs to be reclaimed in order to satisfy pending
  54          * tickets
  55          */
  56         u64 reclaim_size;
  57
  58         /*
  59          * tickets_id just indicates the next ticket will be handled, so note
  60          * it's not stored per ticket.
  61          */
  62         u64 tickets_id;
  63
  64         struct rw_semaphore groups_sem;
  65         /* for block groups in our same type */
  66         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
  67
  68         struct kobject kobj;
  69         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
  70 };
  71
  72 struct reserve_ticket {
  73         u64 bytes;
  74         int error;
  75         bool steal;
  76         struct list_head list;
  77         wait_queue_head_t wait;
  78 };
  79
  80 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
  81 {
  82         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
  83                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
  84 }
  85
  86 /*
  87  *
  88  * Declare a helper function to detect underflow of various space info members
  89  */
  90 #define DECLARE_SPACE_INFO_UPDATE(name, trace_name)                     \
  91 static inline void                                                      \
  92 btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info,           \
  93                                struct btrfs_space_info *sinfo,          \
  94                                s64 bytes)                               \
  95 {                                                                       \
  96         const u64 abs_bytes = (bytes < 0) ? -bytes : bytes;             \
  97         lockdep_assert_held(&sinfo->lock);                              \
  98         trace_update_##name(fs_info, sinfo, sinfo->name, bytes);        \
  99         trace_btrfs_space_reservation(fs_info, trace_name,              \
 100                                       sinfo->flags, abs_bytes,          \
 101                                       bytes > 0);                       \
 102         if (bytes < 0 && sinfo->name < -bytes) {                        \
 103                 WARN_ON(1);                                             \
 104                 sinfo->name = 0;                                        \
 105                 return;                                                 \
 106         }                                                               \
 107         sinfo->name += bytes;                                           \
 108 }
 109
 110 DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
 111 DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
 112
 113 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
 114 void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
 115                              u64 total_bytes, u64 bytes_used,
 116                              u64 bytes_readonly, u64 bytes_zone_unusable,
 117                              struct btrfs_space_info **space_info);
 118 struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
 119                                                u64 flags);
 120 u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
 121                           bool may_use_included);
 122 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
 123 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
 124                            struct btrfs_space_info *info, u64 bytes,
 125                            int dump_block_groups);
 126 int btrfs_reserve_metadata_bytes(struct btrfs_root *root,
 127                                  struct btrfs_block_rsv *block_rsv,
 128                                  u64 orig_bytes,
 129                                  enum btrfs_reserve_flush_enum flush);
 130 void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
 131                                 struct btrfs_space_info *space_info);
 132 int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
 133                          struct btrfs_space_info *space_info, u64 bytes,
 134                          enum btrfs_reserve_flush_enum flush);
 135
 136 static inline void btrfs_space_info_free_bytes_may_use(
 137                                 struct btrfs_fs_info *fs_info,
 138                                 struct btrfs_space_info *space_info,
 139                                 u64 num_bytes)
 140 {
 141         spin_lock(&space_info->lock);
 142         btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
 143         btrfs_try_granting_tickets(fs_info, space_info);
 144         spin_unlock(&space_info->lock);
 145 }
 146 int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes,
 147                              enum btrfs_reserve_flush_enum flush);
 148 #endif /* BTRFS_SPACE_INFO_H */