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