tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}