gfs2: Wake up when sd_glock_disposal becomes zero

commit da7d554f7c62d0c17c1ac3cc2586473c2d99f0bd upstream.

Commit fc0e38dae645 ("GFS2: Fix glock deallocation race") fixed a
sd_glock_disposal accounting bug by adding a missing atomic_dec
statement, but it failed to wake up sd_glock_wait when that decrement
causes sd_glock_disposal to reach zero.  As a consequence,
gfs2_gl_hash_clear can now run into a 10-minute timeout instead of
being woken up.  Add the missing wakeup.

Fixes: fc0e38dae645 ("GFS2: Fix glock deallocation race")
Cc: stable@vger.kernel.org # v2.6.39+
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index aea1ed0aebd0f6a615b8118775583e7e8e21ad43..0a0dd3178483e3d5ecdc96d2f14a58ae2daa5d3a 100644 (file)
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -870,7 +870,8 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 out_free:
        kfree(gl->gl_lksb.sb_lvbptr);
        kmem_cache_free(cachep, gl);
-       atomic_dec(&sdp->sd_glock_disposal);
+       if (atomic_dec_and_test(&sdp->sd_glock_disposal))
+               wake_up(&sdp->sd_glock_wait);
 
 out:
        return ret;