330 строки
11 KiB
C
330 строки
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_BLOCK_GROUP_H
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#define BTRFS_BLOCK_GROUP_H
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#include "free-space-cache.h"
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enum btrfs_disk_cache_state {
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BTRFS_DC_WRITTEN,
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BTRFS_DC_ERROR,
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BTRFS_DC_CLEAR,
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BTRFS_DC_SETUP,
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};
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/*
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* This describes the state of the block_group for async discard. This is due
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* to the two pass nature of it where extent discarding is prioritized over
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* bitmap discarding. BTRFS_DISCARD_RESET_CURSOR is set when we are resetting
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* between lists to prevent contention for discard state variables
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* (eg. discard_cursor).
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*/
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enum btrfs_discard_state {
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BTRFS_DISCARD_EXTENTS,
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BTRFS_DISCARD_BITMAPS,
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BTRFS_DISCARD_RESET_CURSOR,
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};
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/*
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* Control flags for do_chunk_alloc's force field CHUNK_ALLOC_NO_FORCE means to
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* only allocate a chunk if we really need one.
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*
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* CHUNK_ALLOC_LIMITED means to only try and allocate one if we have very few
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* chunks already allocated. This is used as part of the clustering code to
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* help make sure we have a good pool of storage to cluster in, without filling
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* the FS with empty chunks
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*
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* CHUNK_ALLOC_FORCE means it must try to allocate one
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*/
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enum btrfs_chunk_alloc_enum {
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CHUNK_ALLOC_NO_FORCE,
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CHUNK_ALLOC_LIMITED,
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CHUNK_ALLOC_FORCE,
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};
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struct btrfs_caching_control {
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struct list_head list;
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struct mutex mutex;
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wait_queue_head_t wait;
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struct btrfs_work work;
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struct btrfs_block_group *block_group;
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u64 progress;
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refcount_t count;
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};
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/* Once caching_thread() finds this much free space, it will wake up waiters. */
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#define CACHING_CTL_WAKE_UP SZ_2M
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struct btrfs_block_group {
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struct btrfs_fs_info *fs_info;
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struct inode *inode;
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spinlock_t lock;
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u64 start;
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u64 length;
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u64 pinned;
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u64 reserved;
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u64 used;
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u64 delalloc_bytes;
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u64 bytes_super;
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u64 flags;
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u64 cache_generation;
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/*
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* If the free space extent count exceeds this number, convert the block
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* group to bitmaps.
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*/
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u32 bitmap_high_thresh;
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/*
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* If the free space extent count drops below this number, convert the
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* block group back to extents.
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*/
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u32 bitmap_low_thresh;
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/*
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* It is just used for the delayed data space allocation because
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* only the data space allocation and the relative metadata update
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* can be done cross the transaction.
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*/
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struct rw_semaphore data_rwsem;
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/* For raid56, this is a full stripe, without parity */
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unsigned long full_stripe_len;
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unsigned int ro;
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unsigned int iref:1;
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unsigned int has_caching_ctl:1;
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unsigned int removed:1;
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unsigned int to_copy:1;
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unsigned int relocating_repair:1;
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unsigned int chunk_item_inserted:1;
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int disk_cache_state;
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/* Cache tracking stuff */
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int cached;
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struct btrfs_caching_control *caching_ctl;
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u64 last_byte_to_unpin;
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struct btrfs_space_info *space_info;
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/* Free space cache stuff */
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struct btrfs_free_space_ctl *free_space_ctl;
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/* Block group cache stuff */
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struct rb_node cache_node;
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/* For block groups in the same raid type */
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struct list_head list;
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refcount_t refs;
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/*
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* List of struct btrfs_free_clusters for this block group.
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* Today it will only have one thing on it, but that may change
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*/
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struct list_head cluster_list;
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/* For delayed block group creation or deletion of empty block groups */
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struct list_head bg_list;
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/* For read-only block groups */
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struct list_head ro_list;
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/*
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* When non-zero it means the block group's logical address and its
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* device extents can not be reused for future block group allocations
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* until the counter goes down to 0. This is to prevent them from being
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* reused while some task is still using the block group after it was
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* deleted - we want to make sure they can only be reused for new block
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* groups after that task is done with the deleted block group.
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*/
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atomic_t frozen;
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/* For discard operations */
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struct list_head discard_list;
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int discard_index;
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u64 discard_eligible_time;
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u64 discard_cursor;
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enum btrfs_discard_state discard_state;
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/* For dirty block groups */
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struct list_head dirty_list;
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struct list_head io_list;
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struct btrfs_io_ctl io_ctl;
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/*
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* Incremented when doing extent allocations and holding a read lock
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* on the space_info's groups_sem semaphore.
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* Decremented when an ordered extent that represents an IO against this
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* block group's range is created (after it's added to its inode's
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* root's list of ordered extents) or immediately after the allocation
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* if it's a metadata extent or fallocate extent (for these cases we
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* don't create ordered extents).
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*/
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atomic_t reservations;
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/*
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* Incremented while holding the spinlock *lock* by a task checking if
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* it can perform a nocow write (incremented if the value for the *ro*
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* field is 0). Decremented by such tasks once they create an ordered
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* extent or before that if some error happens before reaching that step.
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* This is to prevent races between block group relocation and nocow
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* writes through direct IO.
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*/
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atomic_t nocow_writers;
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/* Lock for free space tree operations. */
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struct mutex free_space_lock;
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/*
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* Does the block group need to be added to the free space tree?
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* Protected by free_space_lock.
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*/
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int needs_free_space;
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/* Flag indicating this block group is placed on a sequential zone */
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bool seq_zone;
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/*
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* Number of extents in this block group used for swap files.
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* All accesses protected by the spinlock 'lock'.
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*/
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int swap_extents;
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/* Record locked full stripes for RAID5/6 block group */
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struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
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/*
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* Allocation offset for the block group to implement sequential
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* allocation. This is used only on a zoned filesystem.
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*/
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u64 alloc_offset;
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u64 zone_unusable;
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u64 meta_write_pointer;
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};
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static inline u64 btrfs_block_group_end(struct btrfs_block_group *block_group)
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{
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return (block_group->start + block_group->length);
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}
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static inline bool btrfs_is_block_group_data_only(
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struct btrfs_block_group *block_group)
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{
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/*
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* In mixed mode the fragmentation is expected to be high, lowering the
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* efficiency, so only proper data block groups are considered.
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*/
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return (block_group->flags & BTRFS_BLOCK_GROUP_DATA) &&
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!(block_group->flags & BTRFS_BLOCK_GROUP_METADATA);
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}
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#ifdef CONFIG_BTRFS_DEBUG
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static inline int btrfs_should_fragment_free_space(
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struct btrfs_block_group *block_group)
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{
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struct btrfs_fs_info *fs_info = block_group->fs_info;
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return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
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block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
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(btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
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block_group->flags & BTRFS_BLOCK_GROUP_DATA);
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}
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#endif
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struct btrfs_block_group *btrfs_lookup_first_block_group(
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struct btrfs_fs_info *info, u64 bytenr);
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struct btrfs_block_group *btrfs_lookup_block_group(
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struct btrfs_fs_info *info, u64 bytenr);
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struct btrfs_block_group *btrfs_next_block_group(
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struct btrfs_block_group *cache);
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void btrfs_get_block_group(struct btrfs_block_group *cache);
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void btrfs_put_block_group(struct btrfs_block_group *cache);
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void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
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const u64 start);
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void btrfs_wait_block_group_reservations(struct btrfs_block_group *bg);
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bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
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void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
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void btrfs_wait_nocow_writers(struct btrfs_block_group *bg);
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void btrfs_wait_block_group_cache_progress(struct btrfs_block_group *cache,
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u64 num_bytes);
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int btrfs_wait_block_group_cache_done(struct btrfs_block_group *cache);
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int btrfs_cache_block_group(struct btrfs_block_group *cache,
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int load_cache_only);
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void btrfs_put_caching_control(struct btrfs_caching_control *ctl);
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struct btrfs_caching_control *btrfs_get_caching_control(
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struct btrfs_block_group *cache);
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u64 add_new_free_space(struct btrfs_block_group *block_group,
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u64 start, u64 end);
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struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
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struct btrfs_fs_info *fs_info,
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const u64 chunk_offset);
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int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
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u64 group_start, struct extent_map *em);
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void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
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void btrfs_mark_bg_unused(struct btrfs_block_group *bg);
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void btrfs_reclaim_bgs_work(struct work_struct *work);
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void btrfs_reclaim_bgs(struct btrfs_fs_info *fs_info);
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void btrfs_mark_bg_to_reclaim(struct btrfs_block_group *bg);
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int btrfs_read_block_groups(struct btrfs_fs_info *info);
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struct btrfs_block_group *btrfs_make_block_group(struct btrfs_trans_handle *trans,
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u64 bytes_used, u64 type,
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u64 chunk_offset, u64 size);
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void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
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int btrfs_inc_block_group_ro(struct btrfs_block_group *cache,
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bool do_chunk_alloc);
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void btrfs_dec_block_group_ro(struct btrfs_block_group *cache);
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int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
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int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans);
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int btrfs_setup_space_cache(struct btrfs_trans_handle *trans);
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int btrfs_update_block_group(struct btrfs_trans_handle *trans,
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u64 bytenr, u64 num_bytes, int alloc);
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int btrfs_add_reserved_bytes(struct btrfs_block_group *cache,
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u64 ram_bytes, u64 num_bytes, int delalloc);
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void btrfs_free_reserved_bytes(struct btrfs_block_group *cache,
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u64 num_bytes, int delalloc);
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int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
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enum btrfs_chunk_alloc_enum force);
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int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
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void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
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u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags);
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void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
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int btrfs_free_block_groups(struct btrfs_fs_info *info);
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void btrfs_wait_space_cache_v1_finished(struct btrfs_block_group *cache,
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struct btrfs_caching_control *caching_ctl);
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int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
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struct block_device *bdev, u64 physical, u64 **logical,
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int *naddrs, int *stripe_len);
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static inline u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info)
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{
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return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA);
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}
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static inline u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info)
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{
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return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA);
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}
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static inline u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info)
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{
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return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
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}
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static inline int btrfs_block_group_done(struct btrfs_block_group *cache)
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{
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smp_mb();
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return cache->cached == BTRFS_CACHE_FINISHED ||
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cache->cached == BTRFS_CACHE_ERROR;
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}
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void btrfs_freeze_block_group(struct btrfs_block_group *cache);
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void btrfs_unfreeze_block_group(struct btrfs_block_group *cache);
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bool btrfs_inc_block_group_swap_extents(struct btrfs_block_group *bg);
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void btrfs_dec_block_group_swap_extents(struct btrfs_block_group *bg, int amount);
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#endif /* BTRFS_BLOCK_GROUP_H */
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