Date: Sun, 4 Feb 2007 02:37:11 +0000 From: Josef Karthauser <joe@FreeBSD.org> To: fs@freebsd.org Cc: hackers@freebsd.org Subject: nullfs and named pipes. Message-ID: <20070204023711.GA3393@genius.tao.org.uk>
next in thread | raw e-mail | index | archive | help
--x+6KMIRAuhnl3hBn
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
Hey guys, does anyone know off the top of their heads why named pipes
don't appear to work across null_fs mounted partitions? i.e. if I have
a named pipe in a file system,
# ls -ld /mysql/mysql.sock=20
srwxrwxrwx 1 mysql wheel 0 Feb 3 19:01 /mysql/mysql.sock
# mysql --socket=3D/mysql/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.0.33-log FreeBSD port: mysql-server-5.0.33
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql>=20
However if I make this available elsewhere via a null_fs mount:
# mkdir /foo
# mount_nullfs /mysql /foo
# ls -ld /foo/mysql.sock=20
srwxrwxrwx 1 mysql wheel 0 Feb 3 19:01 /foo/mysql.sock
# mysql --socket=3D/foo/mysql.sock -p
Enter password:=20
ERROR 2002 (HY000): Can't connect to local MySQL server through socket =
'/foo/mysql.sock' (61)
the socket stops working.
However a hardlink to the socket works:
# umount /foo
# ln /mysql/mysql.sock /foo/mysql.sock
# mysql --socket=3D/foo/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 5.0.33-log FreeBSD port: mysql-server-5.0.33
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
Is this a fundamental design issue with null_fs or a bug?
There appears to be a lot of confusion on the lists about this point
as many people are trying to do this so as to make a single mysql
server available from within a number of jails, for instance. However
people appear to think that this is a limitation of the jail code, not a
limitation of the null_fs code. Having named pipes work in null_fs
filesystems would be a very handy thing indeed.
I'd appreciate any insights into this.
Many thanks,
Joe
--x+6KMIRAuhnl3hBn
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (FreeBSD)
iEYEARECAAYFAkXFRtcACgkQXVIcjOaxUBZ2AgCfTJ8HIcdLfntDJMmcX5ndeyDL
W5IAoJ+u0qy81TjfB/P1XedupjNxqp+m
=5sRm
-----END PGP SIGNATURE-----
--x+6KMIRAuhnl3hBn--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070204023711.GA3393>