Re: [PATCH v4 1/6] block: Rework bio_split() return value

[Hannes Reinecke]

On 11/11/24 12:21, John Garry wrote:
> Instead of returning an inconclusive value of NULL for an error in calling
> bio_split(), return a ERR_PTR() always.
>
> Also remove the BUG_ON() calls, and WARN_ON_ONCE() instead. Indeed, since
> almost all callers don't check the return code from bio_split(), we'll
> crash anyway (for those failures).
>
> Fix up the only user which checks bio_split() return code today (directly
> or indirectly), blk_crypto_fallback_split_bio_if_needed(). The md/bcache
> code does check the return code in cached_dev_cache_miss() ->
> bio_next_split() -> bio_split(), but only to see if there was a split, so
> there would be no change in behaviour here (when returning a ERR_PTR()).
>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
> Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
> ---
>   block/bio.c                 | 10 ++++++----
>   block/blk-crypto-fallback.c |  2 +-
>   2 files changed, 7 insertions(+), 5 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke                  Kernel Storage Architect
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