On Thu, Oct 22, 2020 at 10:22:25PM +0100, Matthew Wilcox (Oracle) wrote:
> Use the new blk_completion infrastructure to wait for multiple I/Os.
> Also coalesce adjacent buffer heads into a single BIO instead of
> submitting one BIO per buffer head. This doesn't work for fscrypt yet,
> so keep the old code around for now.
>
> Signed-off-by: Matthew Wilcox (Oracle) <wi...@infradead.org>
> ---
> fs/buffer.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 90 insertions(+)
>
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 1b0ba1d59966..ccb90081117c 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -2249,6 +2249,87 @@ int block_is_partially_uptodate(struct page *page,
> unsigned long from,
> }
> EXPORT_SYMBOL(block_is_partially_uptodate);
>
> +static void readpage_end_bio(struct bio *bio)
> +{
> + struct bio_vec *bvec;
> + struct page *page;
> + struct buffer_head *bh;
> + int i, nr = 0;
> +
> + bio_for_each_bvec_all(bvec, bio, i) {
Shouldn't this technically be bio_for_each_segment_all()? This wants to iterate
over the pages, not the bvecs -- and in general, each bvec might contain
multiple pages.
Now, in this case, each bio has only 1 page and 1 bvec, so it doesn't really
matter. But if we're going to use an iterator, it seems we should use the right
kind.
Likewise in decrypt_bio() in patch 6.
- Eric
