Re: [PATCH] bonding: Prevent deletion of a bond, or the last slave from a bond, with active usage.

Tue, Sep 06, 2016 at 11:34:30AM CEST, jasminder.kaur@hpe.com wrote:

From: "Kaur, Jasminder" <redacted>

If a bond is in use such as with IP address configured, removing it
can result in application disruptions. If bond is used for cluster
communication or network file system interfaces, removing it can cause
system down time.

An additional write option “?-” is added to sysfs bond interfaces as
below, in order to prevent accidental deletions while bond is in use.
In the absence of any usage, the below option proceeds with bond deletion.
“ echo "?-bondX" > /sys/class/net/bonding_masters “ .
If usage is detected such as an IP address configured, deletion is
prevented with appropriate message logged to syslog.

In the absence of any usage, the below option proceeds with deletion of
slaves from a bond.
“ echo "?-enoX" > /sys/class/net/bondX/bonding/slaves “ .
If usage is detected such as an IP address configured on bond, deletion
is prevented if the last slave is being removed from bond.
An appropriate message is logged to syslog.

NACK

sysfs bonding iface should die in peace, don't poke in it.

Either fix you application or fix you configuration flow. Don't do this
in kernel.