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