Re: [PATCH 6.1.y] block: fix bio-cache for passthru IO

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, May 29, 2023 at 05:46:30PM +0530, Kanchan Joshi wrote:
> From: Anuj Gupta <anuj20.g@samsung.com>
> 
> commit <8af870aa5b847> ("block: enable bio caching use for passthru IO")
> introduced bio-cache for passthru IO. In case when nr_vecs are greater
> than BIO_INLINE_VECS, bio and bvecs are allocated from mempool (instead
> of percpu cache) and REQ_ALLOC_CACHE is cleared. This causes the side
> effect of not freeing bio/bvecs into mempool on completion.
> 
> This patch lets the passthru IO fallback to allocation using bio_kmalloc
> when nr_vecs are greater than BIO_INLINE_VECS. The corresponding bio
> is freed during call to blk_mq_map_bio_put during completion.
> 
> Cc: stable@vger.kernel.org # 6.1
> fixes <8af870aa5b847> ("block: enable bio caching use for passthru IO")
> 
> Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
> Link: https://lore.kernel.org/r/20230523111709.145676-1-anuj20.g@samsung.com
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> (cherry picked from commit 46930b7cc7727271c9c27aac1fdc97a8645e2d00)
> ---
>  block/blk-map.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Now queued up, thanks.

greg k-h