[PATCH 08/26] loop: fold loop_update_rotational into loop_reconfigure_limits

[Christoph Hellwig <hch@xxxxxx>]

This prepares for moving the rotational flag into the queue_limits and
also fixes it for the case where the loop device is backed by a block
device.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 drivers/block/loop.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6a4826708a3acf..8991de8fb1bb0b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -916,24 +916,6 @@ static void loop_free_idle_workers_timer(struct timer_list 
*timer)
        return loop_free_idle_workers(lo, false);
 }
 
-static void loop_update_rotational(struct loop_device *lo)
-{
-       struct file *file = lo->lo_backing_file;
-       struct inode *file_inode = file->f_mapping->host;
-       struct block_device *file_bdev = file_inode->i_sb->s_bdev;
-       struct request_queue *q = lo->lo_queue;
-       bool nonrot = true;
-
-       /* not all filesystems (e.g. tmpfs) have a sb->s_bdev */
-       if (file_bdev)
-               nonrot = bdev_nonrot(file_bdev);
-
-       if (nonrot)
-               blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
-       else
-               blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
-}
-
 /**
  * loop_set_status_from_info - configure device from loop_info
  * @lo: struct loop_device to configure
@@ -1003,6 +985,10 @@ static int loop_reconfigure_limits(struct loop_device 
*lo, unsigned short bsize)
        lim.logical_block_size = bsize;
        lim.physical_block_size = bsize;
        lim.io_min = bsize;
+       if (!backing_bdev || bdev_nonrot(backing_bdev))
+               blk_queue_flag_set(QUEUE_FLAG_NONROT, lo->lo_queue);
+       else
+               blk_queue_flag_clear(QUEUE_FLAG_NONROT, lo->lo_queue);
        loop_config_discard(lo, &lim);
        return queue_limits_commit_update(lo->lo_queue, &lim);
 }
@@ -1099,7 +1085,6 @@ static int loop_configure(struct loop_device *lo, 
blk_mode_t mode,
        if (WARN_ON_ONCE(error))
                goto out_unlock;
 
-       loop_update_rotational(lo);
        loop_update_dio(lo);
        loop_sysfs_init(lo);
 
-- 
2.43.0