> }
>
> +struct bio *btrfs_bio_clone_partial(struct bio *orig, gfp_t gfp_mask, int offset, int size)
> +{
> + struct bio *bio;
> +
> + bio = bio_clone_fast(orig, gfp_mask, btrfs_bioset);
> + if (bio) {
bio_clone_fast will never fail when backed by a bioset, which this
one always is. Also you always pass GFP_NPFS as the gfp_mask argument,
it might make sense to hardcode that here.
> + struct btrfs_io_bio *btrfs_bio = btrfs_io_bio(bio);
> + btrfs_bio->csum = NULL;
> + btrfs_bio->csum_allocated = NULL;
> + btrfs_bio->end_io = NULL;
> +
> + bio_trim(bio, (offset >> 9), (size >> 9));
No need for the inner braces here.
Last but not least do you even need this as a separate helper?
> +struct bio *btrfs_bio_clone_partial(struct bio *orig, gfp_t gfp_mask, int offset, int size);
Over long line, please trim to 80 characters
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