tree cc9eee61c37d18e1887f0723d338b121561dc0b9
parent 1ce533686c7d40bf900dc346a7279c17a9ee8e0e
author Steven Whitehouse <swhiteho@redhat.com> 1310370810 +0100
committer Steven Whitehouse <swhiteho@redhat.com> 1310458546 +0100

GFS2: Fix race during filesystem mount

There is a potential race during filesystem mounting which has recently
been reported. It occurs when the userland gfs_controld is able to
process requests fast enough that it tries to use the sysfs interface
before the lock module is properly initialised. This is a pretty
unusual case as normally the lock module initialisation is very quick
compared with gfs_controld.

This patch adds an interruptible completion which is used to ensure that
userland will wait for the initialisation of the lock module to
complete.

There are other potential solutions to this problem, but this is the
quickest at this stage and has been tested both with and without
mount.gfs2 present in the system.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Reported-by: David Booher <dbooher@adams.net>