From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Date: Wed, 21 Nov 2018 17:11:45 +0100
Subject: [Cluster-devel] [PATCH V11 14/19] block: handle non-cluster bio
 out of blk_bio_segment_split
In-Reply-To: <20181121153726.GC19111@ming.t460p>
References: <20181121032327.8434-1-ming.lei@redhat.com>
	<20181121032327.8434-15-ming.lei@redhat.com>
	<20181121143355.GB2594@lst.de> <20181121153726.GC19111@ming.t460p>
Message-ID: <20181121161145.GC4977@lst.de>
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On Wed, Nov 21, 2018 at 11:37:27PM +0800, Ming Lei wrote:
> > +	bio = bio_alloc_bioset(GFP_NOIO, bio_segments(*bio_orig),
> > +			&non_cluster_bio_set);
> 
> bio_segments(*bio_orig) may be > 256, so bio_alloc_bioset() may fail.

Nothing a little min with BIO_MAX_PAGES couldn't fix.  This patch
was just intended as an idea how I think this code could work.