On Tue, Dec 05, 2023 at 10:38:12PM -0800, Christoph Hellwig wrote: > On Tue, Dec 05, 2023 at 04:13:24PM -0800, Eric Biggers wrote: > > From: Eric Biggers <[email protected]> > > > > btrfs, which is planning to add support for fscrypt, has a variety of > > asynchronous things it does with inodes that can potentially last until > > ->put_super, when it shuts everything down and cleans up all async work. > > Consequently, btrfs needs the call to fscrypt_destroy_keyring() to > > happen either after or within ->put_super. > > > > Meanwhile, f2fs needs the call to fscrypt_destroy_keyring() to happen > > either *before* or within ->put_super, due to the dependency of > > f2fs_get_devices() on ->s_fs_info still existing. > > And that means f2fs should free ->s_fs_info in ->kill_sb after > the call to shutdown_generic_super. > > So the right thing here is: > > - change f2fs to free ->s_fs_info later > - move down fscrypt_destroy_keyring in the keneric code to happen > after ->put_super >
There are lots of filesystems that free their ->s_fs_info in ->put_super(). Are they all wrong? - Eric