]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
GFS2: Fix panic in glock memory shrinker
authorBenjamin Marzinski <bmarzins@redhat.com>
Tue, 30 Jun 2009 18:51:11 +0000 (13:51 -0500)
committerSteven Whitehouse <swhiteho@redhat.com>
Thu, 30 Jul 2009 09:59:28 +0000 (10:59 +0100)
commita51b56fff3f04fc5aa66b21a2a6d693ee9862d66
treee93c25ebe818e7a157f2b878a9512ada0f2f2bd1
parent1946f70ab5e4eb8b54a8eaaedba2293a3750ab7e
GFS2: Fix panic in glock memory shrinker

It is possible for gfs2_shrink_glock_memory() to check a glock for
demotion
that's in the process of being freed by gfs2_glock_put().  In this case,
gfs2_shrink_glock_memory() will acquire a new reference to this glock,
and
then try to free the glock itself when it drops the refernce.  To solve
this, gfs2_shrink_glock_memory() just needs to check if the glock is in
the process of being freed, and if so skip it without ever unlocking the
lru_lock.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Acked-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
fs/gfs2/glock.c