Messages in this thread | | | Date | Wed, 17 Jul 2013 17:15:29 -0700 (PDT) | From | Hugh Dickins <> | Subject | Re: [PATCH 0/5] initmpfs v2: use tmpfs instead of ramfs for rootfs |
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On Wed, 17 Jul 2013, Andrew Morton wrote: > On Tue, 16 Jul 2013 08:31:13 -0700 (PDT) Rob Landley <rob@landley.net> wrote: > > > Use tmpfs for rootfs when CONFIG_TMPFS=y and there's no root=. > > Specify rootfstype=ramfs to get the old initramfs behavior. > > > > The previous initramfs code provided a fairly crappy root filesystem: > > didn't let you --bind mount directories out of it, reported zero > > size/usage so it didn't show up in "df" and couldn't run things like > > rpm that query available space before proceeding, would fill up all > > available memory and panic the system if you wrote too much to it... > > The df problem and the mount --bind thing are ramfs issues, are they > not? Can we fix them? If so, that's a less intrusive change, and we > also get a fixed ramfs.
I'll leave others to comment on "mount --bind", but with regard to "df": yes, we could enhance ramfs with accounting such as tmpfs has, to allow it to support non-0 "df". We could have done so years ago; but have always preferred to leave ramfs as minimal, than import tmpfs features into it one by one.
I prefer Rob's approach of making tmpfs usable for rootfs.
Hugh
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