Hi!

To my understanding ->setxattr() is always being called with i_mutex held.
->set_context() in ext4 stores the security context using ext4_xattr_set(),
but the fs crypto framework does not lock the inode itself.
So, depending on the call path, ext4_xattr_set() is sometimes being
called with i_mutex held and some times not.

What are the locking rules for fscrypt_operations and especially 
->set_context()?

Thanks,
//richard

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