[Devel] [PATCH RH8 13/14] dm-qcow2: Introduce __submit_rw_mapped() to avoid segments count

[Kirill Tkhai]

Sometimes we do know number of segments.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 drivers/md/dm-qcow2-map.c |   18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/md/dm-qcow2-map.c b/drivers/md/dm-qcow2-map.c
index daeec3adfc58..c3706705c465 100644
--- a/drivers/md/dm-qcow2-map.c
+++ b/drivers/md/dm-qcow2-map.c
@@ -1231,15 +1231,14 @@ static void dec_cluster_usage(struct qcow2 *qcow2, 
struct md_page *r2_md,
        spin_unlock_irqrestore(&qcow2->md_pages_lock, flags);
 }
 
-static void submit_rw_mapped(struct qcow2 *qcow2, struct qio *qio)
+static void __submit_rw_mapped(struct qcow2 *qcow2, struct qio *qio, u32 
nr_segs)
 {
-       unsigned int rw, nr_segs;
        struct bio_vec *bvec;
        struct iov_iter iter;
+       unsigned int rw;
        loff_t pos;
 
        rw = (op_is_write(qio->bi_op) ? WRITE : READ);
-       nr_segs = qio_nr_segs(qio);
        bvec = __bvec_iter_bvec(qio->bi_io_vec, qio->bi_iter);
        pos = to_bytes(qio->bi_iter.bi_sector);
 
@@ -1249,6 +1248,13 @@ static void submit_rw_mapped(struct qcow2 *qcow2, struct 
qio *qio)
        call_rw_iter(qcow2->file, pos, rw, &iter, qio);
 }
 
+static void submit_rw_mapped(struct qcow2 *qcow2, struct qio *qio)
+{
+       u32 nr_segs = qio_nr_segs(qio);
+
+       __submit_rw_mapped(qcow2, qio, nr_segs);
+}
+
 static void map_and_submit_rw(struct qcow2 *qcow2, loff_t clu_pos, struct qio 
*qio)
 {
        WARN_ON_ONCE(qio->qcow2 != qcow2);
@@ -1509,7 +1515,7 @@ static void submit_rw_md_page(unsigned int rw, struct 
qcow2 *qcow2,
 
        /* @pos is not clu-aligned, so we can't use map_and_submit_rw() */
        qio->bi_iter.bi_sector = to_sector(pos);
-       submit_rw_mapped(qcow2, qio);
+       __submit_rw_mapped(qcow2, qio, 1);
 }
 
 static int submit_read_md_page(struct qcow2 *qcow2, struct qio **qio,
@@ -3046,7 +3052,7 @@ static void submit_read_compressed(struct qcow2_map *map, 
struct qio *qio,
        read_qio->bi_iter.bi_sector = to_sector(pos);
        read_qio->bi_iter.bi_size = end - pos;
 
-       submit_rw_mapped(qcow2, read_qio);
+       __submit_rw_mapped(qcow2, read_qio, nr_pages);
 }
 
 static void sliced_cow_read_complete(struct qcow2_target *tgt, struct qio 
*read_qio,
@@ -3688,7 +3694,7 @@ static void submit_cow_data_write(struct qcow2 *qcow2, 
struct qio *qio, loff_t p
 
        write_qio->bi_iter.bi_sector = to_sector(pos);
 
-       submit_rw_mapped(qcow2, write_qio);
+       __submit_rw_mapped(qcow2, write_qio, clu_size >> PAGE_SHIFT);
 }
 
 static void sliced_cow_data_write_complete(struct qcow2_target *tgt, struct 
qio *unused,


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