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The initial FUSE passthrough interface has the issue of introducing an ioctl which receives as a parameter a data structure containing a pointer. What happens is that, depending on the architecture, the size of this struct might change, and especially for 32-bit userspace running on 64-bit kernel, the size mismatch results into different a single ioctl the behavior of which depends on the data that is passed (e.g., with an enum). This is just a poor ioctl design as mentioned by Arnd Bergmann [1]. Introduce the new FUSE_PASSTHROUGH_OPEN ioctl which only gets the fd of the lower file system, which is a fixed-size __u32, dropping the confusing fuse_passthrough_out data structure. [1] https://lore.kernel.org/lkml/CAK8P3a2K2FzPvqBYL9W=Yut58SFXyetXwU4Fz50G5O3TsS0pPQ@mail.gmail.com/ Bug: 175195837 Signed-off-by: Alessio Balsini <balsini@google.com> Change-Id: I486d71cbe20f3c0c87544fa75da4e2704fe57c7c |
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