[Jfs-discussion] Read-only directory is reported writable

[Michael <mue...@ni...>]

Hi Dave,

I mount a partion read-only:
mm@grizzly:~$ mount
...
/dev/mapper/vg_multimedia-lvol0 on /opt/Multimedia type jfs (ro,errors=remount-ro)

mm@grizzly:~$ ls -l /opt/Multimedia/
...
drwxrwx--- 15 mm mueller 4096 2006-04-15 10:53 Filme
...

mm@grizzly:~$ ls -l /opt/Multimedia/Filme/
...
drwxr-xr-x  4 mm mueller         16 2005-09-30 19:11 dvdrip

When I used the read-only mount option the first time I was surprised
that the 'w' still exists. Otherwise I was lucky with that because
copies to other drives have 'w' without any change.

But I'm using the program dvd::rip and that tells that the directory
/opt/Multimedia/Filme/dvdrip/ on this partition is writable. I asked
in the dvd::rip mailing list and was told that it uses perl to
determine if a directory is writable. I got the following perl command
that is similar to the one used in the program:

perl -e 'my $dir="/opt/Multimedia/Filme/dvdrip/"; -d $dir && -w $dir && print "writable\n"'

and it reports "writable".

Now the question is if it is a perl or a JFS problem. I have no free
partition to check it with different read-only mounted filesystems to
find out if JFS behaves the same.

Thanks for your help.

Regards

Michael