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Re: Default size limits for /run (/var/run) and /run/lock (/var/lock)

Hi there!

Disclaimer: this is my last post on this matter (i.e. the meaning of
RAMLOCK), it seems there is a problem with myself or my understanding.

On Tue, 12 Apr 2011 23:42:58 +0200, Roger Leigh wrote:
> On Tue, Apr 12, 2011 at 10:35:37PM +0200, Luca Capello wrote:
>> On Tue, 12 Apr 2011 20:47:35 +0200, Roger Leigh wrote:
>> > On Tue, Apr 12, 2011 at 08:12:21PM +0200, Luca Capello wrote:
>> >> Currently, `man rcS` gives:
>> >> 
>> >> 	RAMLOCK
>> >> 		Make /var/lock/ available as a ram file system (tmpfs).
>> Again, I found it changed: how can you define LOCK_SIZE if /run/lock is
>> on the same tmpfs than /run?
> If you set RAMLOCK=yes, then /run/lock is a *separate* tmpfs
> of size LOCK_SIZE, *exactly* like the /var/lock tmpfs mount
> (it's the same code with s/var/run/g).  So the actual behaviour of this
> option is entirely unchanged bar the switch from /var/lock to
> /run/lock.
> So by default, /run and /run/lock are on the same tmpfs.  But
> if you set RAMLOCK=yes, you'll get a second tmpfs mounted on
> /run/lock.  So yes, /run/lock will always be on a tmpfs filesystem,
> that's obviously the main point of the patch.

Either I do not read `man rcS` as you read it or we do not understand
each other, so here the situation before and after your patch for /run
(/var/lock became useless, everything is in /run/lock now, but I kept
using /var/lock for consistency with the previous state):

[before] RAMLOCK=no  -> /var/lock on the same filesystem /var is on
         RAMLOCK=yes -> /var/lock on tmpfs
 [after] RAMLOCK=no  -> /var/lock is on tmpfs, shared with /run (given
                        that /var/lock is symlinked/bind-mounted to
         RAMLOCK=yes -> /var/lock gets its own tmpfs, differently from
                        the one mounted at /run

So, the meaning of RAMLOCK, WRT `man rcS` and as I read it, *has*
changed.  This is where we do not agree on wordings, but given that
English is not my mother language, maybe it is only my fault.

Thx, bye,
Gismo / Luca

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