Hello, The 1st adds check to avoid to call into iov_iter_revert() with zero 'unroll'. The 2nd patch improves big chunk sequential IO performance by aligning bio with max io size. V2: - add patch 1/2 - add 'max_size' hint to iov_iter_extract_pages() so that bio/iov iter revert can be minimized, as suggested by Christoph BTW, the check on 'bio->bi_bdev' isn't removed because there are more such patterns(P2PDMA, block size check) in __bio_iov_iter_get_pages(), and we need to audit that bio->bi_bdev is really non-NULL first, so it shouldn't be part of this patchset Ming Lei (2): block: don't call into iov_iter_revert if nothing is left block: try to make aligned bio in case of big chunk IO block/bio.c | 126 +++++++++++++++++++++++++++++++++++++++-- include/linux/blkdev.h | 5 ++ 2 files changed, 125 insertions(+), 6 deletions(-) -- 2.41.0
