On Mon, Aug 25, 2025 at 5:40 PM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote:
>
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
>
> By default, /dev/sda is block specail file from devtmpfs, getattr will
> return file size as zero, causing loop failed for raw block device.
>
> We can add bdev_statx() to return device size, however this may introduce
> changes that are not acknowledged by user. Fix this problem by reverting
> changes for block special file, file mapping host is set to bdev inode
> while opening, and use i_size_read() directly to get device size.
>
> Fixes: 47b71abd5846 ("loop: use vfs_getattr_nosec for accurate file size")
> Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-lkp/202508200409.b2459c02-lkp@xxxxxxxxx
> Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
> ---
> Changes in v2:
> - don't call vfs_getattr_nosec() for block special file path, by Ming
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
