Is it possible to mount an entire disk device read only?
cjwatson at ubuntu.com
Mon Sep 7 17:01:35 UTC 2015
On Sun, Sep 06, 2015 at 10:56:08PM +0000, Carlos Checo wrote:
> Hardware and software are two separate things.
I'm aware of that (and could you have said this in any more patronising
a way?). However, it does not affect the explanation I gave in the mail
you're replying to.
> The disk is "mounted" entirely it's just that the disks says it has
> two, one or more partitions. The disk's description is read when
> plugged. When you mount you're using the software part not the
> hardware nature of the disk.
The blockdev command is a piece of software. It changes a piece of data
stored by the kernel (which is also a piece of software) about the disk.
When you attempt to write to a disk (hardware), it goes through the
kernel's block device layer (software); the block device layer may
refuse the write on the grounds that its policy for that block device is
set to read-only.
Colin Watson [cjwatson at ubuntu.com]
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