[Bug 153173] [zfs] booting from a gzip-compressed dataset doesn't work

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=153173

Warner Losh <imp@FreeBSD.org> changed:

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                 CC|                            |imp@FreeBSD.org

--- Comment #8 from Warner Losh <imp@FreeBSD.org> ---
This patch looks good. It leverages code we already have in the boot loader
(inflate.o and friends) so the size increase should be minor (should test the
before/after size).

zstd is also in the boot loader (or at least compiled for the boot loader), so
we could use that instead.

In an ideal world, the boot loader would lose inflate.o and friends and use the
functionality from zstd instead since that's supposed to be a replacement for
it. Since we only use it in gzipfs and pkgfs, perhaps that wouldn't be a heavy
lift and that would result in a savings of maybe 20k which I think is going to
be more and more important to look for as the loader slowly bloats over time.
the EFI loader is in good shape, but the BIOS/CMS loader is getting tight on
space with all we've added to it over the years.

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