linux/fs/bcachefs/data_update.h
Kent Overstreet 7d9f8468ff bcachefs: Data update path won't accidentaly grow replicas
Previously, there was a bug where if an extent had greater durability
than required (because we needed to move a durability=1 pointer and
ended up putting it on a durability 2 device), we would submit a write
for replicas=2 - the durability of the pointer being rewritten - instead
of the number of replicas required to bring it back up to the
data_replicas option.

This, plus the allocation path sometimes allocating on a greater
durability device than requested, meant that extents could continue
having more and more replicas added as they were being rewritten.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2023-11-25 21:48:42 -05:00

50 lines
1.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_DATA_UPDATE_H
#define _BCACHEFS_DATA_UPDATE_H
#include "bkey_buf.h"
#include "io_write_types.h"
struct moving_context;
struct data_update_opts {
unsigned rewrite_ptrs;
unsigned kill_ptrs;
u16 target;
u8 extra_replicas;
unsigned btree_insert_flags;
unsigned write_flags;
};
struct data_update {
/* extent being updated: */
enum btree_id btree_id;
struct bkey_buf k;
struct data_update_opts data_opts;
struct moving_context *ctxt;
struct bch_move_stats *stats;
struct bch_write_op op;
};
int bch2_data_update_index_update(struct bch_write_op *);
void bch2_data_update_read_done(struct data_update *,
struct bch_extent_crc_unpacked);
int bch2_extent_drop_ptrs(struct btree_trans *,
struct btree_iter *,
struct bkey_s_c,
struct data_update_opts);
void bch2_data_update_exit(struct data_update *);
int bch2_data_update_init(struct btree_trans *, struct btree_iter *,
struct moving_context *,
struct data_update *,
struct write_point_specifier,
struct bch_io_opts, struct data_update_opts,
enum btree_id, struct bkey_s_c);
void bch2_data_update_opts_normalize(struct bkey_s_c, struct data_update_opts *);
#endif /* _BCACHEFS_DATA_UPDATE_H */