Matthew Seaman wrote:
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On 11/02/2010 15:39, RW wrote:
On Thu, 11 Feb 2010 15:12:22 +0000
Matthew Seaman <m.sea...@infracaninophile.co.uk> wrote:
On 11/02/2010 14:53, Pierre-Luc Drouin wrote:
I would like to know if there is a mount command that allows to
create a memory disk that can be initialized from a file. What I am
looking for is something like mount_mfs -F, but that does not
modify the actual file. I know what I could easily to this by
copying the content of the file to the memory disk, but I am
looking for a solution that can be configured via fstab.
Yes. See mdconfig(8) -- there are examples in there of exactly what
you want to do.
I don't think covers what he is asking for. I think you would need a
union filsystem that overlays a swap-backed filesystem on top of a
file-backed filesystem - if that's possible.
Actually, I was thinking more along the lines of mounting a .iso as a
cd9660 filesystem. Which won't muck up the underlying .iso, but only
because it's read-only. You could mount a FFS image read-only in
exactly the same way -- I think there's a 'last mounted on' field in the
backing file image that will be updated if the it is writable (even if
the fs itself is mounted ro) but that's not the right answer either.
Basically, you're going to have to mount and initialise as two separate
operations as far as I can see.
By this do you mean that I would need to copy the whole content of the
read-only filesystem to the memory disk?
I looked at the man page for mount_unionfs and there is a big warning
saying that it is a bad idea to use it, so I guess I will pass on this
solution...
What I am trying to do basically is to mount a filesystem from a CD but
I want to use a memory disk to allow write operations. I would basically
want the filesystem to behave like a regular read-write filesystem, but
not have to copy everything into a memory disk. What does "mfs_root" do
exactly in the official FreeBSD boot CDs? Does it copy the content of
mfsroot.gz into a memory disk? That filesystem is so small that I guess
it can be copied without any problem...
Thanks!
Cheers,
Matthew
- --
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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