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/* 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 */
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