lkml.org 
[lkml]   [2021]   [Apr]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH v2 8/8] block: add WARN() in bio_split() for sector alignment
On Thu, Mar 25, 2021 at 09:26:09PM +0000, Satya Tangirala wrote:
> The number of sectors passed to bio_split() should be aligned to
> bio_required_sector_alignment(). All callers (other than bounce.c) have
> been updated to ensure this, so add a WARN() if the number of sectors is
> not aligned. (bounce.c was not updated since it's legacy code that
> won't interact with inline encryption).

What does bounce.c "won't interact with inline encryption" mean, exactly?
Devices that enable bounce buffering won't declare inline encryption support, so
bounce.c will never see a bio that has an encryption context?

> diff --git a/block/bio.c b/block/bio.c
> index 26b7f721cda8..cb348f134a15 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -1458,6 +1458,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
>
> BUG_ON(sectors <= 0);
> BUG_ON(sectors >= bio_sectors(bio));
> + WARN_ON(!IS_ALIGNED(sectors, bio_required_sector_alignment(bio)));

If this warning triggers, shouldn't the function return NULL to indicate a
failure rather than proceeding on?

- Eric

\
 
 \ /
  Last update: 2021-04-15 22:01    [W:0.176 / U:0.616 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site