On Wed, Aug 02, 2023 at 05:41:26PM +0200, Christoph Hellwig wrote:

fs_mark_dead currently uses get_super to find the superblock for the
block device that is going away.  This means it is limited to the
main device stored in sb->s_dev, leading to a lot of code duplication
for file systems that can use multiple block devices.

Now that the holder for all block devices used by file systems is set
to the super_block, we can instead look at that holder and then check
if the file system is born and active, so do that instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
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Looks good to me,
Reviewed-by: Christian Brauner <brauner@kernel.org>