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The old name could have suggested that it held a response to a request
received by fs_wait. The new name is unfortunately very similar to
the `struct vfs_request` already used internally in the kernel, but
it's better at conveying that it contains a filesystem request yet to
be handled.
vfs_request - virtual filesystem request (a bad name in hindsight)
ufs_request - user filesystem request
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$ iostress 32 512 0 > /vtty # before
512 calls, 0 bytes. avg 121133
$ iostress 32 512 0 > /vtty # after
512 calls, 0 bytes. avg 103540
103540/121133 = ~85%
I think the tiny bit of added complexity is worth it here.
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i have been planning to implement something like this for a while now.
it should be faster when doing consecutive syscalls (to be tested).
it will also be helpful in writing the elf loader
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dead processes now can't have alive children
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other parts of the kernel don't need to care about which process exactly
gets switched into
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this makes `process_transition` safe again, as it won't be able to free
processes. it was a pretty unintuitive behaviour
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removes `proc.c`'s pointless dependency on `vfs/root.h`
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This isn't really all that useful, it doesn't enable anything that
wasn't possible before. With it removed I'll be able to implement
process_exit() in a much simpler way.
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the new name is terrible, but at least the function now has a clear
purpose
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awaited_req is a garbage name but i couldn't come up with a better one.
i also have no idea how to handle all the failure states
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