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 8 int 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 29 int 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 51 void 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 } 62