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block: save page offset gaps in cloned bio #1150

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block: save page offset gaps in cloned bio #1150

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9 changes: 9 additions & 0 deletions block/bio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -859,6 +859,7 @@ static int __bio_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp)
bio->bi_ioprio = bio_src->bi_ioprio;
bio->bi_write_hint = bio_src->bi_write_hint;
bio->bi_write_stream = bio_src->bi_write_stream;
bio->bi_bvec_gap_bit = bio_src->bi_bvec_gap_bit;
bio->bi_iter = bio_src->bi_iter;

if (bio->bi_bdev) {
Expand Down Expand Up @@ -1863,6 +1864,14 @@ struct bio *bio_split(struct bio *bio, int sectors,

bio_advance(bio, split->bi_iter.bi_size);

/*
* The gap bit is set when splitting to limits and only applies to the
* front bio that was split off. The remaining bio will calcualte its
* gap value when it is subsequently split to limits, so it is safe to
* re-initialize the value back to 0.
*/
bio->bi_bvec_gap_bit = 0;

if (bio_flagged(bio, BIO_TRACE_COMPLETION))
bio_set_flag(split, BIO_TRACE_COMPLETION);

Expand Down