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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _PCACHE_SEGMENT_H
#define _PCACHE_SEGMENT_H
#include <linux/bio.h>
#include <linux/bitfield.h>
#include "pcache_internal.h"
struct pcache_segment_info {
struct pcache_meta_header header;
__u32 flags;
__u32 next_seg;
};
#define PCACHE_SEG_INFO_FLAGS_HAS_NEXT BIT(0)
#define PCACHE_SEG_INFO_FLAGS_TYPE_MASK GENMASK(4, 1)
#define PCACHE_SEGMENT_TYPE_CACHE_DATA 1
static inline bool segment_info_has_next(struct pcache_segment_info *seg_info)
{
return (seg_info->flags & PCACHE_SEG_INFO_FLAGS_HAS_NEXT);
}
static inline void segment_info_set_type(struct pcache_segment_info *seg_info, u8 type)
{
seg_info->flags &= ~PCACHE_SEG_INFO_FLAGS_TYPE_MASK;
seg_info->flags |= FIELD_PREP(PCACHE_SEG_INFO_FLAGS_TYPE_MASK, type);
}
static inline u8 segment_info_get_type(struct pcache_segment_info *seg_info)
{
return FIELD_GET(PCACHE_SEG_INFO_FLAGS_TYPE_MASK, seg_info->flags);
}
struct pcache_segment_pos {
struct pcache_segment *segment; /* Segment associated with the position */
u32 off; /* Offset within the segment */
};
struct pcache_segment_init_options {
u8 type;
u32 seg_id;
u32 data_off;
struct pcache_segment_info *seg_info;
};
struct pcache_segment {
struct pcache_cache_dev *cache_dev;
void *data;
u32 data_size;
u32 seg_id;
struct pcache_segment_info *seg_info;
};
int segment_copy_to_bio(struct pcache_segment *segment,
u32 data_off, u32 data_len, struct bio *bio, u32 bio_off);
int segment_copy_from_bio(struct pcache_segment *segment,
u32 data_off, u32 data_len, struct bio *bio, u32 bio_off);
static inline void segment_pos_advance(struct pcache_segment_pos *seg_pos, u32 len)
{
BUG_ON(seg_pos->off + len > seg_pos->segment->data_size);
seg_pos->off += len;
}
void pcache_segment_init(struct pcache_cache_dev *cache_dev, struct pcache_segment *segment,
struct pcache_segment_init_options *options);
#endif /* _PCACHE_SEGMENT_H */
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