If dp->get_page() returns an non-zero offset, the bio might need an additional bvec to deal with the offset. For example, if remaining is exactly one page size, but there is an offset, the memory will span two pages. Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx> --- drivers/md/dm-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index 7409490259d1..3333943fe288 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -347,7 +347,7 @@ static void do_region(const blk_opf_t opf, unsigned int region, break; default: num_bvecs = bio_max_segs(dm_sector_div_up(remaining, - (PAGE_SIZE >> SECTOR_SHIFT))); + (PAGE_SIZE >> SECTOR_SHIFT)) + 1); } bio = bio_alloc_bioset(where->bdev, num_bvecs, opf, GFP_NOIO, -- 2.45.0
