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
  21         u64 max_extent_size;    /* This will hold the maximum extent size of
  22                                    the space info if we had an ENOSPC in the
  23                                    allocator. */
  24
  25         unsigned int full:1;    /* indicates that we cannot allocate any more
  26                                    chunks for this space */
  27         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
  28
  29         unsigned int flush:1;           /* set if we are trying to make space */
  30
  31         unsigned int force_alloc;       /* set if we need to force a chunk
  32                                            alloc for this space */
  33
  34         u64 disk_used;          /* total bytes used on disk */
  35         u64 disk_total;         /* total bytes on disk, takes mirrors into
  36                                    account */
  37
  38         u64 flags;
  39
  40         /*
  41          * bytes_pinned is kept in line with what is actually pinned, as in
  42          * we've called update_block_group and dropped the bytes_used counter
  43          * and increased the bytes_pinned counter.  However this means that
  44          * bytes_pinned does not reflect the bytes that will be pinned once the
  45          * delayed refs are flushed, so this counter is inc'ed every time we
  46          * call btrfs_free_extent so it is a realtime count of what will be
  47          * freed once the transaction is committed.  It will be zeroed every
  48          * time the transaction commits.
  49          */
  50         struct percpu_counter total_bytes_pinned;
  51
  52         struct list_head list;
  53         /* Protected by the spinlock 'lock'. */
  54         struct list_head ro_bgs;
  55         struct list_head priority_tickets;
  56         struct list_head tickets;
  57         /*
  58          * tickets_id just indicates the next ticket will be handled, so note
  59          * it's not stored per ticket.
  60          */
  61         u64 tickets_id;
  62
  63         struct rw_semaphore groups_sem;
  64         /* for block groups in our same type */
  65         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
  66
  67         struct kobject kobj;
  68         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
  69 };
  70
  71 struct reserve_ticket {
  72         u64 bytes;
  73         int error;
  74         struct list_head list;
  75         wait_queue_head_t wait;
  76 };
  77
  78 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
  79 {
  80         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
  81                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
  82 }
  83
  84 /*
  85  *
  86  * Declare a helper function to detect underflow of various space info members
  87  */
  88 #define DECLARE_SPACE_INFO_UPDATE(name, trace_name)                     \
  89 static inline void                                                      \
  90 btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info,           \
  91                                struct btrfs_space_info *sinfo,          \
  92                                s64 bytes)                               \
  93 {                                                                       \
  94         const u64 abs_bytes = (bytes < 0) ? -bytes : bytes;             \
  95         lockdep_assert_held(&sinfo->lock);                              \
  96         trace_update_##name(fs_info, sinfo, sinfo->name, bytes);        \
  97         trace_btrfs_space_reservation(fs_info, trace_name,              \
  98                                       sinfo->flags, abs_bytes,          \
  99                                       bytes > 0);                       \
 100         if (bytes < 0 && sinfo->name < -bytes) {                        \
 101                 WARN_ON(1);                                             \
 102                 sinfo->name = 0;                                        \
 103                 return;                                                 \
 104         }                                                               \
 105         sinfo->name += bytes;                                           \
 106 }
 107
 108 DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
 109 DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
 110
 111 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
 112 void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
 113                              u64 total_bytes, u64 bytes_used,
 114                              u64 bytes_readonly,
 115                              struct btrfs_space_info **space_info);
 116 struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
 117                                                u64 flags);
 118 u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
 119                           bool may_use_included);
 120 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
 121 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
 122                            struct btrfs_space_info *info, u64 bytes,
 123                            int dump_block_groups);
 124 int btrfs_reserve_metadata_bytes(struct btrfs_root *root,
 125                                  struct btrfs_block_rsv *block_rsv,
 126                                  u64 orig_bytes,
 127                                  enum btrfs_reserve_flush_enum flush);
 128 void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
 129                                 struct btrfs_space_info *space_info);
 130
 131 static inline void btrfs_space_info_free_bytes_may_use(
 132                                 struct btrfs_fs_info *fs_info,
 133                                 struct btrfs_space_info *space_info,
 134                                 u64 num_bytes)
 135 {
 136         spin_lock(&space_info->lock);
 137         btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
 138         btrfs_try_granting_tickets(fs_info, space_info);
 139         spin_unlock(&space_info->lock);
 140 }
 141
 142 #endif /* BTRFS_SPACE_INFO_H */