Fix the code in loop_reconfigure_limits to pick a default block size for
O_DIRECT file descriptors to also work when the loop device sits on top
of a block device and not just on a regular file on a block device based
file system.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/block/loop.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 4f6d8514d19bd6..d7cf6bbbfb1b86 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -988,10 +988,16 @@ static int loop_reconfigure_limits(struct loop_device *lo, unsigned short bsize)
{
struct file *file = lo->lo_backing_file;
struct inode *inode = file->f_mapping->host;
+ struct block_device *backing_bdev = NULL;
struct queue_limits lim;
+ if (S_ISBLK(inode->i_mode))
+ backing_bdev = I_BDEV(inode);
+ else if (inode->i_sb->s_bdev)
+ backing_bdev = inode->i_sb->s_bdev;
+
if (!bsize)
- bsize = loop_default_blocksize(lo, inode->i_sb->s_bdev);
+ bsize = loop_default_blocksize(lo, backing_bdev);
lim = queue_limits_start_update(lo->lo_queue);
lim.logical_block_size = bsize;
--
2.43.0
