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Diffstat (limited to '')
| -rw-r--r-- | fs/bcachefs/backpointers.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/fs/bcachefs/backpointers.h b/fs/bcachefs/backpointers.h new file mode 100644 index 0000000000..ab866feeaf --- /dev/null +++ b/fs/bcachefs/backpointers.h @@ -0,0 +1,140 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H +#define _BCACHEFS_BACKPOINTERS_BACKGROUND_H + +#include "btree_iter.h" +#include "btree_update.h" +#include "buckets.h" +#include "super.h" + +static inline u64 swab40(u64 x) +{ + return (((x & 0x00000000ffULL) << 32)| + ((x & 0x000000ff00ULL) << 16)| + ((x & 0x0000ff0000ULL) >> 0)| + ((x & 0x00ff000000ULL) >> 16)| + ((x & 0xff00000000ULL) >> 32)); +} + +int bch2_backpointer_invalid(struct bch_fs *, struct bkey_s_c k, + enum bkey_invalid_flags, struct printbuf *); +void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *); +void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); +void bch2_backpointer_swab(struct bkey_s); + +#define bch2_bkey_ops_backpointer ((struct bkey_ops) { \ + .key_invalid = bch2_backpointer_invalid, \ + .val_to_text = bch2_backpointer_k_to_text, \ + .swab = bch2_backpointer_swab, \ + .min_val_size = 32, \ +}) + +#define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10 + +/* + * Convert from pos in backpointer btree to pos of corresponding bucket in alloc + * btree: + */ +static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c, + struct bpos bp_pos) +{ + struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode); + u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT; + + return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector)); +} + +/* + * Convert from pos in alloc btree + bucket offset to pos in backpointer btree: + */ +static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c, + struct bpos bucket, + u64 bucket_offset) +{ + struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode); + struct bpos ret; + + ret = POS(bucket.inode, + (bucket_to_sector(ca, bucket.offset) << + MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset); + + EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret))); + + return ret; +} + +int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bkey_i_backpointer *, + struct bch_backpointer, struct bkey_s_c, bool); + +static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans, + struct bpos bucket, + struct bch_backpointer bp, + struct bkey_s_c orig_k, + bool insert) +{ + struct bch_fs *c = trans->c; + struct bkey_i_backpointer *bp_k; + int ret; + + bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer)); + ret = PTR_ERR_OR_ZERO(bp_k); + if (ret) + return ret; + + bkey_backpointer_init(&bp_k->k_i); + bp_k->k.p = bucket_pos_to_bp(c, bucket, bp.bucket_offset); + bp_k->v = bp; + + if (!insert) { + bp_k->k.type = KEY_TYPE_deleted; + set_bkey_val_u64s(&bp_k->k, 0); + } + + if (unlikely(bch2_backpointers_no_use_write_buffer)) + return bch2_bucket_backpointer_mod_nowritebuffer(trans, bp_k, bp, orig_k, insert); + + return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i); +} + +static inline enum bch_data_type bkey_ptr_data_type(enum btree_id btree_id, unsigned level, + struct bkey_s_c k, struct extent_ptr_decoded p) +{ + return level ? BCH_DATA_btree : + p.has_ec ? BCH_DATA_stripe : + BCH_DATA_user; +} + +static inline void bch2_extent_ptr_to_bp(struct bch_fs *c, + enum btree_id btree_id, unsigned level, + struct bkey_s_c k, struct extent_ptr_decoded p, + struct bpos *bucket_pos, struct bch_backpointer *bp) +{ + enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p); + s64 sectors = level ? btree_sectors(c) : k.k->size; + u32 bucket_offset; + + *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset); + *bp = (struct bch_backpointer) { + .btree_id = btree_id, + .level = level, + .data_type = data_type, + .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) + + p.crc.offset, + .bucket_len = ptr_disk_sectors(sectors, p), + .pos = k.k->p, + }; +} + +int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int, + struct bpos *, struct bch_backpointer *, unsigned); +struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *, + struct bpos, struct bch_backpointer, + unsigned); +struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *, + struct bpos, struct bch_backpointer); + +int bch2_check_btree_backpointers(struct bch_fs *); +int bch2_check_extents_to_backpointers(struct bch_fs *); +int bch2_check_backpointers_to_extents(struct bch_fs *); + +#endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */ |