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for extending and reusing it. The sendfile_sync wrapper is mostly just a "mbuf transaction" wrapper, used to indicate that the backing store for a group of mbufs has completed. It's only being used by sendfile for now and it's only implementing a sleep/wakeup rendezvous. However, there are other potential signaling paths (kqueue) and other potential uses (socket zero-copy write) where the same mechanism would also be useful. So, with that in mind: * extract the sendfile_sync code out into sf_sync_*() methods * teach the sf_sync_alloc method about the current config flag - it will eventually know about kqueue. * move the sendfile_sync code out of do_sendfile() - the only thing it now knows about is the sfs pointer. The guts of the sync rendezvous (setup, rendezvous/wait, free) is now done in the syscall wrapper. * .. and teach the 32-bit compat sendfile call the same. This should be a no-op. It's primarily preparation work for teaching the sendfile_sync about kqueue notification. Tested: * Peter Holm's sendfile stress / regression scripts Sponsored by: Netflix, Inc. |
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