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b56f35560b
Handle the preliminary work for relocating a block group in a filesystem with the remap-tree flag set. If the block group is SYSTEM btrfs_relocate_block_group() proceeds as it does already, as bootstrapping issues mean that these block groups have to be processed the existing way. Similarly with METADATA_REMAP blocks, which are dealt with in a later patch. Otherwise we walk the free-space tree for the block group in question, recording any holes. These get converted into identity remaps and placed in the remap tree, and the block group's REMAPPED flag is set. From now on no new allocations are possible within this block group, and any I/O to it will be funnelled through btrfs_translate_remap(). We store the number of identity remaps in `identity_remap_count`, so that we know when we've removed the last one and the block group is fully remapped. The change in btrfs_read_roots() is because data relocations no longer rely on the data reloc tree as a hidden subvolume in which to do snapshots. (Thanks to Sun YangKai for his suggestions.) Reviewed-by: Boris Burkov <boris@bur.io> Signed-off-by: Mark Harmstone <mark@harmstone.com> Signed-off-by: David Sterba <dsterba@suse.com>
62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015 Facebook. All rights reserved.
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*/
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#ifndef BTRFS_FREE_SPACE_TREE_H
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#define BTRFS_FREE_SPACE_TREE_H
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#include <linux/bits.h>
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struct btrfs_caching_control;
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struct btrfs_fs_info;
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struct btrfs_path;
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struct btrfs_block_group;
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struct btrfs_trans_handle;
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/*
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* The default size for new free space bitmap items. The last bitmap in a block
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* group may be truncated, and none of the free space tree code assumes that
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* existing bitmaps are this size.
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*/
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#define BTRFS_FREE_SPACE_BITMAP_SIZE 256
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#define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
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void btrfs_set_free_space_tree_thresholds(struct btrfs_block_group *block_group);
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int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
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int btrfs_delete_free_space_tree(struct btrfs_fs_info *fs_info);
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int btrfs_rebuild_free_space_tree(struct btrfs_fs_info *fs_info);
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int btrfs_load_free_space_tree(struct btrfs_caching_control *caching_ctl);
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int btrfs_add_block_group_free_space(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group);
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int btrfs_remove_block_group_free_space(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group);
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int btrfs_add_to_free_space_tree(struct btrfs_trans_handle *trans,
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u64 start, u64 size);
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int btrfs_remove_from_free_space_tree(struct btrfs_trans_handle *trans,
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u64 start, u64 size);
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int btrfs_delete_orphan_free_space_entries(struct btrfs_fs_info *fs_info);
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struct btrfs_free_space_info *
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btrfs_search_free_space_info(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path, int cow);
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struct btrfs_root *btrfs_free_space_root(struct btrfs_block_group *block_group);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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int __btrfs_add_to_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path, u64 start, u64 size);
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int __btrfs_remove_from_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path, u64 start, u64 size);
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int btrfs_convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path);
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int btrfs_convert_free_space_to_extents(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path);
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bool btrfs_free_space_test_bit(struct btrfs_block_group *block_group,
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struct btrfs_path *path, u64 offset);
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#endif
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#endif
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