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lightnvm: pblk: fix crash in pblk_end_partial_read due to multipage bvecs 

The introduction of multipage bio vectors broke pblk's partial read
logic due to it not being prepared for multipage bio vectors.

Use bio vector iterators instead of direct bio vector indexing.

Fixes: 07173c3ec2 ("block: enable multipage bvecs")
Reported-by: Klaus Jensen <klaus.jensen@cnexlabs.com>
Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Updated description.
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hans Holmberg 2019-04-10 19:56:43 +02:00 committed by Jens Axboe
parent eb3afb75b5
commit b2b3a70cd9
1 changed files with 28 additions and 22 deletions
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50
drivers/lightnvm/pblk-read.c
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@ -231,14 +231,14 @@ static void pblk_end_partial_read(struct nvm_rq *rqd)
struct pblk_sec_meta *meta;
struct bio *new_bio = rqd->bio;
struct bio *bio = pr_ctx->orig_bio;
struct bio_vec src_bv, dst_bv;
void *meta_list = rqd->meta_list;
int bio_init_idx = pr_ctx->bio_init_idx;
unsigned long *read_bitmap = pr_ctx->bitmap;
struct bvec_iter orig_iter = BVEC_ITER_ALL_INIT;
struct bvec_iter new_iter = BVEC_ITER_ALL_INIT;
int nr_secs = pr_ctx->orig_nr_secs;
int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
void *src_p, *dst_p;
int hole, i;
int bit, i;
if (unlikely(nr_holes == 1)) {
struct ppa_addr ppa;
@ -257,33 +257,39 @@ static void pblk_end_partial_read(struct nvm_rq *rqd)
/* Fill the holes in the original bio */
i = 0;
hole = find_first_zero_bit(read_bitmap, nr_secs);
do {
struct pblk_line *line;
for (bit = 0; bit < nr_secs; bit++) {
if (!test_bit(bit, read_bitmap)) {
struct bio_vec dst_bv, src_bv;
struct pblk_line *line;
line = pblk_ppa_to_line(pblk, rqd->ppa_list[i]);
kref_put(&line->ref, pblk_line_put);
line = pblk_ppa_to_line(pblk, rqd->ppa_list[i]);
kref_put(&line->ref, pblk_line_put);
meta = pblk_get_meta(pblk, meta_list, hole);
meta->lba = cpu_to_le64(pr_ctx->lba_list_media[i]);
meta = pblk_get_meta(pblk, meta_list, bit);
meta->lba = cpu_to_le64(pr_ctx->lba_list_media[i]);
src_bv = new_bio->bi_io_vec[i++];
dst_bv = bio->bi_io_vec[bio_init_idx + hole];
dst_bv = bio_iter_iovec(bio, orig_iter);
src_bv = bio_iter_iovec(new_bio, new_iter);
src_p = kmap_atomic(src_bv.bv_page);
dst_p = kmap_atomic(dst_bv.bv_page);
src_p = kmap_atomic(src_bv.bv_page);
dst_p = kmap_atomic(dst_bv.bv_page);
memcpy(dst_p + dst_bv.bv_offset,
src_p + src_bv.bv_offset,
PBLK_EXPOSED_PAGE_SIZE);
memcpy(dst_p + dst_bv.bv_offset,
src_p + src_bv.bv_offset,
PBLK_EXPOSED_PAGE_SIZE);
kunmap_atomic(src_p);
kunmap_atomic(dst_p);
kunmap_atomic(src_p);
kunmap_atomic(dst_p);
mempool_free(src_bv.bv_page, &pblk->page_bio_pool);
flush_dcache_page(dst_bv.bv_page);
mempool_free(src_bv.bv_page, &pblk->page_bio_pool);
hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
} while (hole < nr_secs);
bio_advance_iter(new_bio, &new_iter,
PBLK_EXPOSED_PAGE_SIZE);
i++;
}
bio_advance_iter(bio, &orig_iter, PBLK_EXPOSED_PAGE_SIZE);
}
bio_put(new_bio);
kfree(pr_ctx);