Date: Wed, 21 Oct 2015 01:04:53 -0700 From: NGie Cooper <yaneurabeya@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r289203 - head/usr.sbin/makefs Message-ID: <F399C99D-F2A1-441C-ACC8-EF418A5F46ED@gmail.com> In-Reply-To: <201510130232.t9D2WFo2034264@repo.freebsd.org> References: <201510130232.t9D2WFo2034264@repo.freebsd.org>
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> On Oct 12, 2015, at 19:32, Adrian Chadd <adrian@freebsd.org> wrote: > > Author: adrian > Date: Tue Oct 13 02:32:15 2015 > New Revision: 289203 > URL: https://svnweb.freebsd.org/changeset/base/289203 > > Log: > makefs: introduce a new option to specify what to round the resulting > image up to. > > From ticket: > > While trying to run FreeBSD/mips on some device having very small flash media, > one is forced to compress file system with mkulzma(8) utility. It is desirable > to specify small UFS block/fragment sizes like 4096/512 bytes for makefs(8) > and big compression block size like 65535 bytes to mkulzma at the same time. > Then one obtains very good comression ratios (like 75% and more) but faces > the following problem. > > geom_uncompress kernel module reports GEOM provider size rounded up to its > compression block size. Generally, this changes original media size and now > it fails to match the size of embedded UFS file system that leads to other > problems, f.e. geom_label kernel module does not like this and skips the > file system while tasting the GEOM and looking for UFS label. > > This makes it impossible to refer to the file system using known UFS label > instead of something like /dev/map/rootfs.uncompress. > > The following patch introduces new command line option "-r roundup" for makefs > that makes it round up the image to specified block size. Hence, geom_uncompress > does not change GEOM media size for images rounded that way and geom_label > accepts such GEOMs just fine. > > With the patch applied, one can use following commands: > > $ makefs -t ffs -r 65536 -o bsize=4096,fsize=512,label=flash optimization=space fs.img fs > $ mkulzma -s 65536 -o fs.img.ulzma fs.img > > PR: bin/203707 > Submitted by: <eugen@grosbein.net> 1. roundup doesn’t seem like a user-friendly name. 2. “roundup” isn’t documented under the FFS-specific options. I’m going to send out a CR soon updating the documentation and changing -r to -R. Thanks, -NGie
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