fuse: when are release requests queued?

[Nikolaus Rath <Nikolaus@rath.org>]

Hello,

I am trying to debug a sporadic test failure in libfuse
(https://github.com/libfuse/libfuse/issues/157).


Can someone tell me at which point the fuse kernel module will send a
RELEASE request to userspace? Is it possible that this is delayed until
after the close() syscall for the last fd has returned and userspace has
submitted a different fuse request for the same fs?


Looking at fs/fuse/file.c, it looks as if fuse_release() directly calls
fuse_request_send_background() to send the request. But at that point I
can no longer follow the code. Is it possible for another request to
sneak in at this point?

Furthermore, does the VFS call fuse_release() directly while handling
the close() syscall, or does this happen asynchronously later on?


Thanks!
-Nikolaus

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