segment.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2#include <linux/dax.h>
 3
 4#include "pcache_internal.h"
 5#include "cache_dev.h"
 6#include "segment.h"
 7
 8int segment_copy_to_bio(struct pcache_segment *segment,
 9		u32 data_off, u32 data_len, struct bio *bio, u32 bio_off)
10{
11	struct iov_iter iter;
12	size_t copied;
13	void *src;
14
15	iov_iter_bvec(&iter, ITER_DEST, &bio->bi_io_vec[bio->bi_iter.bi_idx],
16			bio_segments(bio), bio->bi_iter.bi_size);
17	iter.iov_offset = bio->bi_iter.bi_bvec_done;
18	if (bio_off)
19		iov_iter_advance(&iter, bio_off);
20
21	src = segment->data + data_off;
22	copied = _copy_mc_to_iter(src, data_len, &iter);
23	if (copied != data_len)
24		return -EIO;
25
26	return 0;
27}
28
29int segment_copy_from_bio(struct pcache_segment *segment,
30		u32 data_off, u32 data_len, struct bio *bio, u32 bio_off)
31{
32	struct iov_iter iter;
33	size_t copied;
34	void *dst;
35
36	iov_iter_bvec(&iter, ITER_SOURCE, &bio->bi_io_vec[bio->bi_iter.bi_idx],
37			bio_segments(bio), bio->bi_iter.bi_size);
38	iter.iov_offset = bio->bi_iter.bi_bvec_done;
39	if (bio_off)
40		iov_iter_advance(&iter, bio_off);
41
42	dst = segment->data + data_off;
43	copied = _copy_from_iter_flushcache(dst, data_len, &iter);
44	if (copied != data_len)
45		return -EIO;
46	pmem_wmb();
47
48	return 0;
49}
50
51void pcache_segment_init(struct pcache_cache_dev *cache_dev, struct pcache_segment *segment,
52		      struct pcache_segment_init_options *options)
53{
54	segment->seg_info = options->seg_info;
55	segment_info_set_type(segment->seg_info, options->type);
56
57	segment->cache_dev = cache_dev;
58	segment->seg_id = options->seg_id;
59	segment->data_size = PCACHE_SEG_SIZE - options->data_off;
60	segment->data = CACHE_DEV_SEGMENT(cache_dev, options->seg_id) + options->data_off;
61}