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>
next in thread | previous in thread | raw e-mail | index | archive | help
> On Oct 12, 2015, at 19:32, Adrian Chadd <adrian@freebsd.org> wrote: >=20 > Author: adrian > Date: Tue Oct 13 02:32:15 2015 > New Revision: 289203 > URL: https://svnweb.freebsd.org/changeset/base/289203 >=20 > Log: > makefs: introduce a new option to specify what to round the resulting > image up to. >=20 > =46rom ticket: >=20 > 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. >=20 > 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. >=20 > This makes it impossible to refer to the file system using known UFS = label > instead of something like /dev/map/rootfs.uncompress. >=20 > 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. >=20 > With the patch applied, one can use following commands: >=20 > $ makefs -t ffs -r 65536 -o bsize=3D4096,fsize=3D512,label=3Dflash = optimization=3Dspace fs.img fs > $ mkulzma -s 65536 -o fs.img.ulzma fs.img >=20 > PR: bin/203707 > Submitted by: <eugen@grosbein.net> 1. roundup doesn=E2=80=99t seem like a user-friendly name. 2. =E2=80=9Croundup=E2=80=9D isn=E2=80=99t documented under the = FFS-specific options. I=E2=80=99m going to send out a CR soon updating the documentation and = changing -r to -R. Thanks, -NGie=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?F399C99D-F2A1-441C-ACC8-EF418A5F46ED>