Date: Sun, 25 Jul 2010 18:51:31 +0200 From: Olivier Smedts <olivier@gid0.org> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-fs@freebsd.org Subject: Re: zfs loader: allow access to any filesystem in a pool Message-ID: <AANLkTin84T7-ac_7-x5vWQFrSEcj0L3Q=OG7y6B4%2BQhT@mail.gmail.com> In-Reply-To: <4C4C15DE.1030802@icyb.net.ua> References: <4C4C15DE.1030802@icyb.net.ua>
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2010/7/25 Andriy Gapon <avg@icyb.net.ua>: > > This is a ZFS boot patch that I would like to present you for review and testing: > http://people.freebsd.org/~avg/zfsboot.diff > > Currently in zfsloader you can only switch between pools, but you can only > access one predetermined filesystem within a pool - wither root dataset of a > pool or a filesystem pointed to by bootfs pool property. > With this patch it is possible to access any filesystem in a pool and, thus, to > boot kernel and modules from an alternative filesystem. This is another > stepping stone in so called Boot Environments support. > > An example. > You can boot kernel from a different filesystem by doing the following at the > loader prompt: > set currdev=zfs:tank/some/fs: Can you specify a snapshot ? For example set currdev=zfs:tank/rootfs@20100722: I never tried this, but it would be really great in case of a broken kernel/world. Cheers > (note the trailing colon). > This is a breakdown of device name format: > "zfs" - is type of a device > "tank" - is a sample pool name > "some/fs" - is a sample name of a filesystem within the pool > > You can access an individual file e.g. like this: > load zfs:tank/some/fs:boot/kernel/module.ko > "boot/kernel/module.ko" is a path within the specified filesystem (from its root). > > As an additional feature, default filesystem (either root dataset or the one > pointed to by bootfs) is resolved to its name, so currdev and loaddev will be in > the format shown above. > > Thank you in advance for any feedback! > -- > Andriy Gapon > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > -- Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier@gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."
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