rbd: adjust queue limits for "fancy" striping

In order to take full advantage of merging in ceph_file_to_extents(),
allow object set sized I/Os.  If the layout is not "fancy", an object
set consists of just one object.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index e40e490..6a18058 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3928,7 +3928,8 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
 {
        struct gendisk *disk;
        struct request_queue *q;
-       u64 segment_size;
+       unsigned int objset_bytes =
+           rbd_dev->layout.object_size * rbd_dev->layout.stripe_count;
        int err;
 
        /* create gendisk info */
@@ -3968,20 +3969,18 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
        blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
        /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */
 
-       /* set io sizes to object size */
-       segment_size = rbd_obj_bytes(&rbd_dev->header);
-       blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE);
+       blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT);
        q->limits.max_sectors = queue_max_hw_sectors(q);
        blk_queue_max_segments(q, USHRT_MAX);
        blk_queue_max_segment_size(q, UINT_MAX);
-       blk_queue_io_min(q, segment_size);
-       blk_queue_io_opt(q, segment_size);
+       blk_queue_io_min(q, objset_bytes);
+       blk_queue_io_opt(q, objset_bytes);
 
        /* enable the discard support */
        blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
-       q->limits.discard_granularity = segment_size;
-       blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE);
-       blk_queue_max_write_zeroes_sectors(q, segment_size / SECTOR_SIZE);
+       q->limits.discard_granularity = objset_bytes;
+       blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT);
+       blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT);
 
        if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
                q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;