diff options
Diffstat (limited to 'fs/bcachefs/backpointers.h')
| -rw-r--r-- | fs/bcachefs/backpointers.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/fs/bcachefs/backpointers.h b/fs/bcachefs/backpointers.h new file mode 100644 index 000000000000..3b29fdf519dd --- /dev/null +++ b/fs/bcachefs/backpointers.h @@ -0,0 +1,180 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H +#define _BCACHEFS_BACKPOINTERS_BACKGROUND_H + +#include "btree_cache.h" +#include "btree_iter.h" +#include "btree_update.h" +#include "buckets.h" +#include "error.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_validate(struct bch_fs *, struct bkey_s_c k, enum bch_validate_flags); +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_validate = bch2_backpointer_validate, \ + .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_dev *ca, struct bpos bp_pos) +{ + u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT; + + return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector)); +} + +static inline bool bp_pos_to_bucket_nodev_noerror(struct bch_fs *c, struct bpos bp_pos, struct bpos *bucket) +{ + rcu_read_lock(); + struct bch_dev *ca = bch2_dev_rcu(c, bp_pos.inode); + if (ca) + *bucket = bp_pos_to_bucket(ca, bp_pos); + rcu_read_unlock(); + return ca != NULL; +} + +static inline bool bp_pos_to_bucket_nodev(struct bch_fs *c, struct bpos bp_pos, struct bpos *bucket) +{ + return !bch2_fs_inconsistent_on(!bp_pos_to_bucket_nodev_noerror(c, bp_pos, bucket), + c, "backpointer for missing device %llu", bp_pos.inode); +} + +static inline struct bpos bucket_pos_to_bp_noerror(const struct bch_dev *ca, + struct bpos bucket, + u64 bucket_offset) +{ + return POS(bucket.inode, + (bucket_to_sector(ca, bucket.offset) << + MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset); +} + +/* + * Convert from pos in alloc btree + bucket offset to pos in backpointer btree: + */ +static inline struct bpos bucket_pos_to_bp(const struct bch_dev *ca, + struct bpos bucket, + u64 bucket_offset) +{ + struct bpos ret = bucket_pos_to_bp_noerror(ca, bucket, bucket_offset); + EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(ca, ret))); + return ret; +} + +int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bch_dev *, + struct bpos bucket, struct bch_backpointer, struct bkey_s_c, bool); + +static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans, + struct bch_dev *ca, + struct bpos bucket, + struct bch_backpointer bp, + struct bkey_s_c orig_k, + bool insert) +{ + if (unlikely(bch2_backpointers_no_use_write_buffer)) + return bch2_bucket_backpointer_mod_nowritebuffer(trans, ca, bucket, bp, orig_k, insert); + + struct bkey_i_backpointer bp_k; + + bkey_backpointer_init(&bp_k.k_i); + bp_k.k.p = bucket_pos_to_bp(ca, 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); + } + + return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k.k_i); +} + +static inline enum bch_data_type bch2_bkey_ptr_data_type(struct bkey_s_c k, + struct extent_ptr_decoded p, + const union bch_extent_entry *entry) +{ + switch (k.k->type) { + case KEY_TYPE_btree_ptr: + case KEY_TYPE_btree_ptr_v2: + return BCH_DATA_btree; + case KEY_TYPE_extent: + case KEY_TYPE_reflink_v: + return p.has_ec ? BCH_DATA_stripe : BCH_DATA_user; + case KEY_TYPE_stripe: { + const struct bch_extent_ptr *ptr = &entry->ptr; + struct bkey_s_c_stripe s = bkey_s_c_to_stripe(k); + + BUG_ON(ptr < s.v->ptrs || + ptr >= s.v->ptrs + s.v->nr_blocks); + + return ptr >= s.v->ptrs + s.v->nr_blocks - s.v->nr_redundant + ? BCH_DATA_parity + : BCH_DATA_user; + } + default: + BUG(); + } +} + +static inline void __bch2_extent_ptr_to_bp(struct bch_fs *c, struct bch_dev *ca, + enum btree_id btree_id, unsigned level, + struct bkey_s_c k, struct extent_ptr_decoded p, + const union bch_extent_entry *entry, + struct bpos *bucket_pos, struct bch_backpointer *bp, + u64 sectors) +{ + u32 bucket_offset; + *bucket_pos = PTR_BUCKET_POS_OFFSET(ca, &p.ptr, &bucket_offset); + *bp = (struct bch_backpointer) { + .btree_id = btree_id, + .level = level, + .data_type = bch2_bkey_ptr_data_type(k, p, entry), + .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) + + p.crc.offset, + .bucket_len = sectors, + .pos = k.k->p, + }; +} + +static inline void bch2_extent_ptr_to_bp(struct bch_fs *c, struct bch_dev *ca, + enum btree_id btree_id, unsigned level, + struct bkey_s_c k, struct extent_ptr_decoded p, + const union bch_extent_entry *entry, + struct bpos *bucket_pos, struct bch_backpointer *bp) +{ + u64 sectors = ptr_disk_sectors(level ? btree_sectors(c) : k.k->size, p); + + __bch2_extent_ptr_to_bp(c, ca, btree_id, level, k, p, entry, bucket_pos, bp, sectors); +} + +int bch2_get_next_backpointer(struct btree_trans *, struct bch_dev *ca, 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 */ |