[PATCH 2/5] dm: add __send_empty_flush_bios() helper

[Yang Yang]

There are no functional changes, the helper will be used in later
patches.

Signed-off-by: Yang Yang <yang.y...@vivo.com>
---
 drivers/md/dm.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 56aa2a8b9d71..25215b93c3cf 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1543,6 +1543,20 @@ static unsigned int __send_duplicate_bios(struct 
clone_info *ci, struct dm_targe
        return ret;
 }
 
+static void __send_empty_flush_bios(struct dm_table *t, struct dm_target *ti,
+               struct clone_info *ci)
+{
+       unsigned int bios;
+
+       if (unlikely(ti->num_flush_bios == 0))
+               return;
+
+       atomic_add(ti->num_flush_bios, &ci->io->io_count);
+       bios = __send_duplicate_bios(ci, ti, ti->num_flush_bios,
+                       NULL, GFP_NOWAIT);
+       atomic_sub(ti->num_flush_bios - bios, &ci->io->io_count);
+}
+
 static void __send_empty_flush(struct clone_info *ci)
 {
        struct dm_table *t = ci->map;
@@ -1561,16 +1575,9 @@ static void __send_empty_flush(struct clone_info *ci)
        ci->io->tio.clone.bi_iter.bi_size = 0;
 
        for (unsigned int i = 0; i < t->num_targets; i++) {
-               unsigned int bios;
                struct dm_target *ti = dm_table_get_target(t, i);
 
-               if (unlikely(ti->num_flush_bios == 0))
-                       continue;
-
-               atomic_add(ti->num_flush_bios, &ci->io->io_count);
-               bios = __send_duplicate_bios(ci, ti, ti->num_flush_bios,
-                                            NULL, GFP_NOWAIT);
-               atomic_sub(ti->num_flush_bios - bios, &ci->io->io_count);
+               __send_empty_flush_bios(t, ti, ci);
        }
 
        /*
-- 
2.34.1