Re: md device is read only mode

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On Mon, 9 Jul 2012 19:34:07 +0200 Piergiorgio Sartor
<piergiorgio.sartor@xxxxxxxx> wrote:

> Hi Neil,
> please see one comment below.
> On Mon, Jul 09, 2012 at 11:40:22AM +1000, NeilBrown wrote:
> [...]
> > The mount system call will notice that the device is read-only, and will make
> > assume the read-only mount option.
> OK, so it should work as expected.
> The story was this.
> After fixing the RAID-5 superblock problem, we
> wanted to see if the filesystem was still OK.
> So we started the RAID in r/o mode (so to avoid
> any possible further damage from mount) and then
> mounted the filesystem (actually, now that I
> think of it, there was an LVM layer in the middle).
> This mount caused a kernel error report (I do
> not know if BUG() or else).
> Is there any explanation for that?

Probably LVM isn't detecting that the underlying device is readonly and so
forcing the upper device to be readonly.
md doesn't do this either - it should.


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