/* 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 */