From 28e89fd914a22e8a64f05ae2f0048b06165f371b Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Thu, 7 Jun 2018 14:42:05 -0600
Subject: block: add bioset_init_from_src() helper

Add a helper that allows a caller to initialize a new bio_set,
using the settings from an existing bio_set.

Reported-by: Venkat R.B <vrbagal1@linux.vnet.ibm.com>
Tested-by: Venkat R.B <vrbagal1@linux.vnet.ibm.com>
Tested-by: Li Wang <liwang@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/bio.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'block')

diff --git a/block/bio.c b/block/bio.c
index 595663e0281a..bf516d873ce9 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1967,6 +1967,24 @@ bad:
 }
 EXPORT_SYMBOL(bioset_init);
 
+/*
+ * Initialize and setup a new bio_set, based on the settings from
+ * another bio_set.
+ */
+int bioset_init_from_src(struct bio_set *bs, struct bio_set *src)
+{
+	int flags;
+
+	flags = 0;
+	if (src->bvec_pool.min_nr)
+		flags |= BIOSET_NEED_BVECS;
+	if (src->rescue_workqueue)
+		flags |= BIOSET_NEED_RESCUER;
+
+	return bioset_init(bs, src->bio_pool.min_nr, src->front_pad, flags);
+}
+EXPORT_SYMBOL(bioset_init_from_src);
+
 #ifdef CONFIG_BLK_CGROUP
 
 /**
-- 
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