From baa2c7c97153b8064dbeeb99f2f72de3a75c90a7 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Mon, 11 Jan 2021 11:05:55 +0800 Subject: [PATCH] block: set .bi_max_vecs as actual allocated vector number bvec_alloc() may allocate more bio vectors than requested, so set .bi_max_vecs as actual allocated vector number, instead of the requested number. This way can help fs build bigger bio because new bio often won't be allocated until the current one becomes full. Reviewed-by: Christoph Hellwig Signed-off-by: Ming Lei Reviewed-by: Pavel Begunkov Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe --- block/bio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index 8ccda51dd831..56a06f94fb63 100644 --- a/block/bio.c +++ b/block/bio.c @@ -505,12 +505,13 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int nr_iovecs, goto err_free; bio->bi_flags |= idx << BVEC_POOL_OFFSET; + bio->bi_max_vecs = bvec_nr_vecs(idx); } else if (nr_iovecs) { bvl = bio->bi_inline_vecs; + bio->bi_max_vecs = inline_vecs; } bio->bi_pool = bs; - bio->bi_max_vecs = nr_iovecs; bio->bi_io_vec = bvl; return bio;