132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H
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#define _BCACHEFS_BACKPOINTERS_BACKGROUND_H
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#include "btree_iter.h"
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#include "btree_update.h"
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#include "buckets.h"
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#include "super.h"
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int bch2_backpointer_invalid(const struct bch_fs *, struct bkey_s_c k,
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enum bkey_invalid_flags, struct printbuf *);
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void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *);
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void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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void bch2_backpointer_swab(struct bkey_s);
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#define bch2_bkey_ops_backpointer ((struct bkey_ops) { \
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.key_invalid = bch2_backpointer_invalid, \
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.val_to_text = bch2_backpointer_k_to_text, \
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.swab = bch2_backpointer_swab, \
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.min_val_size = 32, \
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})
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#define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10
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/*
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* Convert from pos in backpointer btree to pos of corresponding bucket in alloc
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* btree:
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*/
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static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c,
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struct bpos bp_pos)
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{
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struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode);
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u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
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return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
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}
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/*
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* Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
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*/
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static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c,
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struct bpos bucket,
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u64 bucket_offset)
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{
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struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
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struct bpos ret;
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ret = POS(bucket.inode,
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(bucket_to_sector(ca, bucket.offset) <<
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MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
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EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret)));
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return ret;
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}
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int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bkey_i_backpointer *,
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struct bch_backpointer, struct bkey_s_c, bool);
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static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
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struct bpos bucket,
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struct bch_backpointer bp,
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struct bkey_s_c orig_k,
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bool insert)
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{
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struct bch_fs *c = trans->c;
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struct bkey_i_backpointer *bp_k;
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int ret;
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bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
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ret = PTR_ERR_OR_ZERO(bp_k);
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if (ret)
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return ret;
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bkey_backpointer_init(&bp_k->k_i);
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bp_k->k.p = bucket_pos_to_bp(c, bucket, bp.bucket_offset);
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bp_k->v = bp;
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if (!insert) {
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bp_k->k.type = KEY_TYPE_deleted;
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set_bkey_val_u64s(&bp_k->k, 0);
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}
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if (unlikely(bch2_backpointers_no_use_write_buffer))
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return bch2_bucket_backpointer_mod_nowritebuffer(trans, bp_k, bp, orig_k, insert);
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return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i);
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}
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static inline enum bch_data_type bkey_ptr_data_type(enum btree_id btree_id, unsigned level,
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struct bkey_s_c k, struct extent_ptr_decoded p)
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{
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return level ? BCH_DATA_btree :
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p.has_ec ? BCH_DATA_stripe :
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BCH_DATA_user;
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}
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static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
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enum btree_id btree_id, unsigned level,
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struct bkey_s_c k, struct extent_ptr_decoded p,
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struct bpos *bucket_pos, struct bch_backpointer *bp)
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{
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enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p);
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s64 sectors = level ? btree_sectors(c) : k.k->size;
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u32 bucket_offset;
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*bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
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*bp = (struct bch_backpointer) {
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.btree_id = btree_id,
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.level = level,
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.data_type = data_type,
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.bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
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p.crc.offset,
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.bucket_len = ptr_disk_sectors(sectors, p),
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.pos = k.k->p,
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};
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}
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int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
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struct bpos *, struct bch_backpointer *, unsigned);
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struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
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struct bpos, struct bch_backpointer,
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unsigned);
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struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
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struct bpos, struct bch_backpointer);
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int bch2_check_btree_backpointers(struct bch_fs *);
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int bch2_check_extents_to_backpointers(struct bch_fs *);
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int bch2_check_backpointers_to_extents(struct bch_fs *);
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#endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */
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