LXR linux/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
   6struct 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        wait_queue_head_t wait;
  67
  68        struct kobject kobj;
  69        struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
  70};
  71
  72struct reserve_ticket {
  73        u64 orig_bytes;
  74        u64 bytes;
  75        int error;
  76        struct list_head list;
  77        wait_queue_head_t wait;
  78};
  79
  80static 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)                                 \
  91static inline void                                                      \
  92btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info,           \
  93                               struct btrfs_space_info *sinfo,          \
  94                               s64 bytes)                               \
  95{                                                                       \
  96        lockdep_assert_held(&sinfo->lock);                              \
  97        trace_update_##name(fs_info, sinfo, sinfo->name, bytes);        \
  98        if (bytes < 0 && sinfo->name < -bytes) {                        \
  99                WARN_ON(1);                                             \
 100                sinfo->name = 0;                                        \
 101                return;                                                 \
 102        }                                                               \
 103        sinfo->name += bytes;                                           \
 104}
 105
 106DECLARE_SPACE_INFO_UPDATE(bytes_may_use);
 107DECLARE_SPACE_INFO_UPDATE(bytes_pinned);
 108
 109void btrfs_space_info_add_new_bytes(struct btrfs_fs_info *fs_info,
 110                                    struct btrfs_space_info *space_info,
 111                                    u64 num_bytes);
 112void btrfs_space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
 113                                    struct btrfs_space_info *space_info,
 114                                    u64 num_bytes);
 115int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
 116void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
 117                             u64 total_bytes, u64 bytes_used,
 118                             u64 bytes_readonly,
 119                             struct btrfs_space_info **space_info);
 120struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
 121                                               u64 flags);
 122u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
 123                          bool may_use_included);
 124void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
 125void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
 126                           struct btrfs_space_info *info, u64 bytes,
 127                           int dump_block_groups);
 128int btrfs_reserve_metadata_bytes(struct btrfs_root *root,
 129                                 struct btrfs_block_rsv *block_rsv,
 130                                 u64 orig_bytes,
 131                                 enum btrfs_reserve_flush_enum flush);
 132
 133#endif /* BTRFS_SPACE_INFO_H */
 134