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/*
* This file is part of dm-writeboost
* Copyright (C) 2012-2018 Akira Hayakawa <ruby.wktk@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef DM_WRITEBOOST_METADATA_H
#define DM_WRITEBOOST_METADATA_H
/*----------------------------------------------------------------------------*/
struct segment_header *
get_segment_header_by_id(struct wb_device *, u64 segment_id);
struct rambuffer *get_rambuffer_by_id(struct wb_device *wb, u64 id);
sector_t calc_mb_start_sector(struct wb_device *, struct segment_header *,
u32 mb_idx);
u8 mb_idx_inseg(struct wb_device *, u32 mb_idx);
struct segment_header *mb_to_seg(struct wb_device *, struct metablock *);
bool is_on_buffer(struct wb_device *, u32 mb_idx);
/*----------------------------------------------------------------------------*/
struct lookup_key {
sector_t sector;
};
struct ht_head;
struct ht_head *ht_get_head(struct wb_device *, struct lookup_key *);
struct metablock *ht_lookup(struct wb_device *,
struct ht_head *, struct lookup_key *);
void ht_register(struct wb_device *, struct ht_head *,
struct metablock *, struct lookup_key *);
void ht_del(struct wb_device *, struct metablock *);
void discard_caches_inseg(struct wb_device *, struct segment_header *);
/*----------------------------------------------------------------------------*/
void prepare_segment_header_device(void *rambuffer, struct wb_device *,
struct segment_header *src);
u32 calc_checksum(void *rambuffer, u8 length);
/*----------------------------------------------------------------------------*/
int try_alloc_writeback_ios(struct wb_device *, size_t nr_batch, gfp_t gfp);
/*----------------------------------------------------------------------------*/
int resume_cache(struct wb_device *);
void free_cache(struct wb_device *);
/*----------------------------------------------------------------------------*/
#endif
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