jfs reverting permissions?

jfs reverting permissions?

[Frederik Eaton]

Hi,

I'm experiencing a problem on a JFS mount where a certain directory
becomes non-world-readable every month or so. It started out
non-world-readable when I initially copied it from a CD, and then I
changed the permissions to world-readable, but they keep getting
reverted. It seems to happen in one direction only - it doesn't go
back and forth. I don't think it's just happening when I reboot. I've
looked at all the cron jobs on my system and can't find anything that
would be causing this behavior. So I'm wondering if maybe this is a
known bug in JFS, or if any other JFS users have seen something
similar.

Regards,

Frederik Eaton

-- 
http://ofb.net/~frederik/

Re: jfs reverting permissions?

[Sonny Rao]

On Wed, Jun 01, 2005 at 11:59:10PM -0700, Frederik Eaton wrote:
> Hi,
> 
> I'm experiencing a problem on a JFS mount where a certain directory
> becomes non-world-readable every month or so. It started out
> non-world-readable when I initially copied it from a CD, and then I
> changed the permissions to world-readable, but they keep getting
> reverted. It seems to happen in one direction only - it doesn't go
> back and forth. I don't think it's just happening when I reboot. I've
> looked at all the cron jobs on my system and can't find anything that
> would be causing this behavior. So I'm wondering if maybe this is a
> known bug in JFS, or if any other JFS users have seen something
> similar.

I don't think anyone else has reported such a bug on JFS but the
maintainer (cc'ed on this email) would know for sure. 

Sonny

Re: jfs reverting permissions?

[Dave Kleikamp]

On Fri, 2005-06-03 at 15:17 -0400, Sonny Rao wrote:
> On Wed, Jun 01, 2005 at 11:59:10PM -0700, Frederik Eaton wrote:
> > Hi,
> > 
> > I'm experiencing a problem on a JFS mount where a certain directory
> > becomes non-world-readable every month or so. It started out
> > non-world-readable when I initially copied it from a CD, and then I
> > changed the permissions to world-readable, but they keep getting
> > reverted. It seems to happen in one direction only - it doesn't go
> > back and forth. I don't think it's just happening when I reboot. I've
> > looked at all the cron jobs on my system and can't find anything that
> > would be causing this behavior. So I'm wondering if maybe this is a
> > known bug in JFS, or if any other JFS users have seen something
> > similar.
> 
> I don't think anyone else has reported such a bug on JFS but the
> maintainer (cc'ed on this email) would know for sure. 

No, I don't remember anybody reporting anything like this.  I would
suspect a file system bug if the permissions reverted after a short
time, such that a change was made in-memory, but was not written to
disk.  But if it happens roughly every month, it's more likely some
outside force is changing the permissions.

> Sonny
-- 
David Kleikamp
IBM Linux Technology Center

Re: jfs reverting permissions?

[Frederik Eaton]

OK, thanks. I've added some logging and now I'm waiting for the
problem to reproduce itself but it's been like 6 times in 6 months and
I can't find any suspicious cron entries.

Frederik

On Fri, Jun 03, 2005 at 02:46:30PM -0500, Dave Kleikamp wrote:
> On Fri, 2005-06-03 at 15:17 -0400, Sonny Rao wrote:
> > On Wed, Jun 01, 2005 at 11:59:10PM -0700, Frederik Eaton wrote:
> > > Hi,
> > > 
> > > I'm experiencing a problem on a JFS mount where a certain directory
> > > becomes non-world-readable every month or so. It started out
> > > non-world-readable when I initially copied it from a CD, and then I
> > > changed the permissions to world-readable, but they keep getting
> > > reverted. It seems to happen in one direction only - it doesn't go
> > > back and forth. I don't think it's just happening when I reboot. I've
> > > looked at all the cron jobs on my system and can't find anything that
> > > would be causing this behavior. So I'm wondering if maybe this is a
> > > known bug in JFS, or if any other JFS users have seen something
> > > similar.
> > 
> > I don't think anyone else has reported such a bug on JFS but the
> > maintainer (cc'ed on this email) would know for sure. 
> 
> No, I don't remember anybody reporting anything like this.  I would
> suspect a file system bug if the permissions reverted after a short
> time, such that a change was made in-memory, but was not written to
> disk.  But if it happens roughly every month, it's more likely some
> outside force is changing the permissions.
> 
> > Sonny
> -- 
> David Kleikamp
> IBM Linux Technology Center

-- 
http://ofb.net/~frederik/