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![Naohiro Aota](/assets/img/avatar_default.png)
The active_total_bytes, like the total_bytes, accounts for the total bytes of active block groups in the space_info. With an introduction of active_total_bytes, we can check if the reserved bytes can be written to the block groups without activating a new block group. The check is necessary for metadata allocation on zoned filesystem. We cannot finish a block group, which may require waiting for the current transaction, from the metadata allocation context. Instead, we need to ensure the ongoing allocation (reserved bytes) fits in active block groups. Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_SPACE_INFO_H
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#define BTRFS_SPACE_INFO_H
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#include "volumes.h"
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struct btrfs_space_info {
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spinlock_t lock;
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u64 total_bytes; /* total bytes in the space,
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this doesn't take mirrors into account */
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u64 bytes_used; /* total bytes used,
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this doesn't take mirrors into account */
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u64 bytes_pinned; /* total bytes pinned, will be freed when the
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transaction finishes */
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u64 bytes_reserved; /* total bytes the allocator has reserved for
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current allocations */
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u64 bytes_may_use; /* number of bytes that may be used for
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delalloc/allocations */
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u64 bytes_readonly; /* total bytes that are read only */
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/* Total bytes in the space, but only accounts active block groups. */
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u64 active_total_bytes;
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u64 bytes_zone_unusable; /* total bytes that are unusable until
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resetting the device zone */
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u64 max_extent_size; /* This will hold the maximum extent size of
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the space info if we had an ENOSPC in the
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allocator. */
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/* Chunk size in bytes */
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u64 chunk_size;
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/*
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* Once a block group drops below this threshold (percents) we'll
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* schedule it for reclaim.
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*/
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int bg_reclaim_threshold;
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int clamp; /* Used to scale our threshold for preemptive
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flushing. The value is >> clamp, so turns
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out to be a 2^clamp divisor. */
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unsigned int full:1; /* indicates that we cannot allocate any more
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chunks for this space */
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unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
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unsigned int flush:1; /* set if we are trying to make space */
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unsigned int force_alloc; /* set if we need to force a chunk
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alloc for this space */
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u64 disk_used; /* total bytes used on disk */
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u64 disk_total; /* total bytes on disk, takes mirrors into
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account */
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u64 flags;
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struct list_head list;
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/* Protected by the spinlock 'lock'. */
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struct list_head ro_bgs;
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struct list_head priority_tickets;
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struct list_head tickets;
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/*
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* Size of space that needs to be reclaimed in order to satisfy pending
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* tickets
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*/
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u64 reclaim_size;
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/*
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* tickets_id just indicates the next ticket will be handled, so note
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* it's not stored per ticket.
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*/
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u64 tickets_id;
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struct rw_semaphore groups_sem;
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/* for block groups in our same type */
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struct list_head block_groups[BTRFS_NR_RAID_TYPES];
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struct kobject kobj;
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struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
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};
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struct reserve_ticket {
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u64 bytes;
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int error;
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bool steal;
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struct list_head list;
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wait_queue_head_t wait;
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};
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static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
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{
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return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
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(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
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}
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/*
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*
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* Declare a helper function to detect underflow of various space info members
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*/
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#define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \
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static inline void \
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btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \
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struct btrfs_space_info *sinfo, \
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s64 bytes) \
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{ \
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const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \
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lockdep_assert_held(&sinfo->lock); \
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trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \
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trace_btrfs_space_reservation(fs_info, trace_name, \
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sinfo->flags, abs_bytes, \
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bytes > 0); \
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if (bytes < 0 && sinfo->name < -bytes) { \
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WARN_ON(1); \
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sinfo->name = 0; \
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return; \
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} \
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sinfo->name += bytes; \
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}
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DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
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DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
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int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
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void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
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u64 total_bytes, u64 bytes_used,
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u64 bytes_readonly, u64 bytes_zone_unusable,
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bool active, struct btrfs_space_info **space_info);
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void btrfs_update_space_info_chunk_size(struct btrfs_space_info *space_info,
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u64 chunk_size);
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struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
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u64 flags);
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u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
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bool may_use_included);
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void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
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void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *info, u64 bytes,
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int dump_block_groups);
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int btrfs_reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
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struct btrfs_block_rsv *block_rsv,
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u64 orig_bytes,
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enum btrfs_reserve_flush_enum flush);
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void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *space_info);
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int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *space_info, u64 bytes,
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enum btrfs_reserve_flush_enum flush);
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static inline void btrfs_space_info_free_bytes_may_use(
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struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *space_info,
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u64 num_bytes)
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{
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spin_lock(&space_info->lock);
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btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
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btrfs_try_granting_tickets(fs_info, space_info);
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spin_unlock(&space_info->lock);
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}
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int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes,
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enum btrfs_reserve_flush_enum flush);
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#endif /* BTRFS_SPACE_INFO_H */
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