From: Omar Sandoval <[email protected]>
The request queue created when we create a loop device has the default
logical block size of 512. When we associate the device with an fd, we
set the block size on the block_device but don't update the logical
block size of the request_queue. This makes it impossibe to use direct
I/O with a backing file on a device with a block size >512, as the
following check in __loop_update_dio() fails:
sb_bsize = bdev_logical_block_size(inode->i_sb->s_bdev);
if (queue_logical_block_size(lo->lo_queue) >= sb_bsize &&
...
Fix it by updating the logical block size when we set the fd.
Signed-off-by: Omar Sandoval <[email protected]>
---
drivers/block/loop.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index cc981f34e017..1bb22903ad1a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -941,6 +941,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
/* let user-space know about the new size */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+ blk_queue_logical_block_size(lo->lo_queue, lo_blocksize);
set_blocksize(bdev, lo_blocksize);
lo->lo_state = Lo_bound;
--
2.12.2
