62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/dax.h>
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#include "pcache_internal.h"
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#include "cache_dev.h"
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#include "segment.h"
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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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{
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struct iov_iter iter;
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size_t copied;
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void *src;
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iov_iter_bvec(&iter, ITER_DEST, &bio->bi_io_vec[bio->bi_iter.bi_idx],
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bio_segments(bio), bio->bi_iter.bi_size);
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iter.iov_offset = bio->bi_iter.bi_bvec_done;
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if (bio_off)
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iov_iter_advance(&iter, bio_off);
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src = segment->data + data_off;
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copied = _copy_mc_to_iter(src, data_len, &iter);
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if (copied != data_len)
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return -EIO;
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return 0;
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}
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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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{
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struct iov_iter iter;
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size_t copied;
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void *dst;
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iov_iter_bvec(&iter, ITER_SOURCE, &bio->bi_io_vec[bio->bi_iter.bi_idx],
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bio_segments(bio), bio->bi_iter.bi_size);
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iter.iov_offset = bio->bi_iter.bi_bvec_done;
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if (bio_off)
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iov_iter_advance(&iter, bio_off);
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dst = segment->data + data_off;
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copied = _copy_from_iter_flushcache(dst, data_len, &iter);
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if (copied != data_len)
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return -EIO;
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pmem_wmb();
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return 0;
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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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{
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segment->seg_info = options->seg_info;
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segment_info_set_type(segment->seg_info, options->type);
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segment->cache_dev = cache_dev;
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segment->seg_id = options->seg_id;
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segment->data_size = PCACHE_SEG_SIZE - options->data_off;
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segment->data = CACHE_DEV_SEGMENT(cache_dev, options->seg_id) + options->data_off;
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}
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