Quoting Michael H. Warfield (m...@wittsend.com):
> No. There's a change there, all right, and thank you for reminding me
> of that, but (afaik) it's NOT in the kernel itself. It's a mount
> option. It's that bloody MS_SHARED option and, to a lessor extent,
There *is* a kernel change which dhansen was telling me about last
week - I believe it's commit 4ed5e82fe77f4147cf386327c9a63a2dd7eff518.
It allows you to now do
sudo mount -t tmpfs tmpfs /tmp/a
sudo mount -o bind,remount,ro /tmp/a /tmp/b
In the past you had to first create a bind mount before you could
mark it readonly, i.e.
sudo mount -t tmpfs tmpfs /tmp/a
sudo mount --bind /tmp/a /tmp/b
sudo mount -o remount,ro /tmp/b /tmp/b
In either case first making sure there is a bind-mount for us to mark
read-write seems to work. (We'll have to, of course, make sure it
was actually read-write to begin with, and that the user *wants* it
read-write. That'll be the only painful part of this patch)
-serge
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