Re: [PATCH] Don't create grubenv on ZFS

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 03.02.2012 11:07, Richard Laager wrote:
> On Fri, 2012-02-03 at 11:05 +0100, Vladimir 'φ-coder/phcoder' Serbinenko
> wrote:
> > On 02.02.2012 12:16, Richard Laager wrote:
> > > GRUB can't write to ZFS.  Creating a grubenv file leads to a misleading
> > > "sparse file not allowed" error on boot.  The attached patch for
> > > grub-install skips the creation of a grubenv file on ZFS.
> > This isn't specific to ZFS. BtrFS, squash4, all variants of cpio, tar
> > and romfs are affected by the same problem. Could you expand your patch
> > to handle those?
> I suspect that handling them by name is not the best way to do this. How
> can I tell if a filesystem doesn't support writing?
I think it's the best way. One could use grub-fstest blocklist but it 
has other problems.  While btrfs and zfs don't hook blocklist on purpose 
(COW and, more importantly, checksums), others are just almost never 
sector-aligned or are compressed.


--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko