Re: Journaling: Surviving or allowing unclean shutdown?

[David Woodhouse]

[e-mail] said:
> In what way?  A root fs readonly mount is usually designed to prevent
                                            ^^^^^^^
> the filesystem from being stomped on during the initial boot so that
> fsck can run without the filesystem being volatile.  That's the only
> reason for the readonly mount: to allow recovery before we enable
> writes.  With ext3, that recovery is done in the kernel, so doing that
> recovery during mount makes perfect sense even if the user is mounting
> root readonly. 

Alternative reasons for readonly mount include "my hard drive is dying and 
I don't want _anything_ to write to it because it'll explode".

You mount it read-only, recover as much as possible from it, and bin it.

You _don't_ want the fs code to ignore your explicit instructions not to
write to the medium, and to destroy whatever data were left.

--
dwmw2