e3e464ac6d
Ever since the btree code was first written, handling of overwriting existing extents - including partially overwriting and splittin existing extents - was handled as part of the core btree insert path. The modern transaction and iterator infrastructure didn't exist then, so that was the only way for it to be done. This patch moves that outside of the core btree code to a pass that runs at transaction commit time. This is a significant simplification to the btree code and overall reduction in code size, but more importantly it gets us much closer to the core btree code being completely independent of extents and is important prep work for snapshots. This introduces a new feature bit; the old and new extent update models are incompatible when the filesystem needs journal replay. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_RECOVERY_H
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#define _BCACHEFS_RECOVERY_H
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struct journal_keys {
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struct journal_key {
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enum btree_id btree_id:8;
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struct bkey_i *k;
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u32 journal_seq;
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u32 journal_offset;
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} *d;
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size_t nr;
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u64 journal_seq_base;
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};
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#define for_each_journal_key(keys, i) \
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for (i = (keys).d; i < (keys).d + (keys).nr; (i)++)
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struct journal_iter {
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struct journal_keys *keys;
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struct journal_key *k;
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enum btree_id btree_id;
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};
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struct btree_and_journal_iter {
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enum btree_id btree_id;
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struct btree_iter *btree;
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struct journal_iter journal;
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enum last_key_returned {
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none,
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btree,
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journal,
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} last;
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};
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void bch2_btree_and_journal_iter_advance(struct btree_and_journal_iter *);
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struct bkey_s_c bch2_btree_and_journal_iter_peek(struct btree_and_journal_iter *);
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struct bkey_s_c bch2_btree_and_journal_iter_next(struct btree_and_journal_iter *);
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struct journal_key *journal_key_search(struct journal_keys *,
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enum btree_id, struct bpos);
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void bch2_btree_and_journal_iter_init(struct btree_and_journal_iter *,
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struct btree_trans *,
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struct journal_keys *,
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enum btree_id, struct bpos);
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int bch2_fs_recovery(struct bch_fs *);
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int bch2_fs_initialize(struct bch_fs *);
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#endif /* _BCACHEFS_RECOVERY_H */
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