From: "Jun'ichi Nomura" <j-nomura@xxxxxxxxxxxxx> bio_alloc_bioset() will return NULL if 'num_vecs' is too large. Use bio_get_nr_vecs() to get estimation of maximum number. Signed-off-by: "Jun'ichi Nomura" <j-nomura@xxxxxxxxxxxxx> Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx> --- drivers/md/dm-io.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletion(-) Index: linux/drivers/md/dm-io.c =================================================================== --- linux.orig/drivers/md/dm-io.c 2007-07-11 21:37:32.000000000 +0100 +++ linux/drivers/md/dm-io.c 2007-07-11 21:37:43.000000000 +0100 @@ -293,7 +293,10 @@ static void do_region(int rw, unsigned i * bvec for bio_get/set_region() and decrement bi_max_vecs * to hide it from bio_add_page(). */ - num_bvecs = (remaining / (PAGE_SIZE >> SECTOR_SHIFT)) + 2; + num_bvecs = dm_sector_div_up(remaining, + (PAGE_SIZE >> SECTOR_SHIFT)); + num_bvecs = 1 + min_t(int, bio_get_nr_vecs(where->bdev), + num_bvecs); bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, io->client->bios); bio->bi_sector = where->sector + (where->count - remaining); bio->bi_bdev = where->bdev; -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
