drbd: properly use max_hw_sectors to limit the our bio size

To ease tracking of bios in some hash tables, we want it to
not cross certain boundaries (128k, used to be 32k).
We limit the maximum bio size using queue parameters.

Historically some defines and variables we use there have been named
max_segment_size, which was misguided. Rename them to max_bio_size,
and use [blk_]queue_max_hw_sectors where appropriate.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index af805efc94d7..782d87237cb4 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -524,7 +524,7 @@ int w_make_resync_request(struct drbd_conf *mdev,
         unsigned long bit;
         sector_t sector;
         const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
-        int max_segment_size;
+        int max_bio_size;
         int number, rollback_i, size;
         int align, queued, sndbuf;
         int i = 0;
@@ -559,9 +559,9 @@ int w_make_resync_request(struct drbd_conf *mdev,
 
         /* starting with drbd 8.3.8, we can handle multi-bio EEs,
          * if it should be necessary */
-        max_segment_size =
-                mdev->agreed_pro_version < 94 ? queue_max_segment_size(mdev->rq_queue) :
-                mdev->agreed_pro_version < 95 ? DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_SEGMENT_SIZE;
+        max_bio_size =
+                mdev->agreed_pro_version < 94 ? queue_max_hw_sectors(mdev->rq_queue) << 9 :
+                mdev->agreed_pro_version < 95 ? DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_BIO_SIZE;
 
         number = drbd_rs_number_requests(mdev);
         if (number == 0)
@@ -605,7 +605,7 @@ next_sector:
                         goto next_sector;
                 }
 
-#if DRBD_MAX_SEGMENT_SIZE > BM_BLOCK_SIZE
+#if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE
                 /* try to find some adjacent bits.
                  * we stop if we have already the maximum req size.
                  *
@@ -615,7 +615,7 @@ next_sector:
                 align = 1;
                 rollback_i = i;
                 for (;;) {
-                        if (size + BM_BLOCK_SIZE > max_segment_size)
+                        if (size + BM_BLOCK_SIZE > max_bio_size)
                                 break;
 
                         /* Be always aligned */