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87efb39075
Add a new ->shutdown super operation that can be used to tell the file system to shut down, and call it from newly created holder ops when the block device under a file system shuts down. This only covers the main block device for "simple" file systems using get_tree_bdev / mount_bdev. File systems their own get_tree method or opening additional devices will need to set up their own blk_holder_ops. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Acked-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Link: https://lore.kernel.org/r/20230601094459.1350643-12-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>