Re: [PATCH] fscrypt: move the call to fscrypt_destroy_keyring() into ->put_super()

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Tue, Dec 05, 2023 at 10:44:30PM -0800, Eric Biggers wrote:
> There are lots of filesystems that free their ->s_fs_info in ->put_super().  Are
> they all wrong?

Wrong is the wrong word :)

For simple file systems that either don't use block devices, or just
the main one set up by the super.c code using ->put_super is perfectly
fine.  Once a file system does something complicated like setting up
their own block devices, or trying to reuse super blocks using custom
rules it basically has to free ->s_fs_info  in it's own ->kill_sb
handler.  This whole area is a bit messy unfortunately.