GFS2: Wait for unlock completion on umount
This patch adds a wait on umount between the point at which we
dispose of all glocks and the point at which we unmount the
lock protocol. This ensures that we've received all the replies
to our unlock requests before we stop the locking.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Reported-by: Fabio M. Di Nitto <fdinitto@redhat.com>
diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 46df988..cdd0755 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -21,6 +21,7 @@
{
struct gfs2_glock *gl = arg;
unsigned ret = gl->gl_state;
+ struct gfs2_sbd *sdp = gl->gl_sbd;
BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED);
@@ -30,6 +31,8 @@
switch (gl->gl_lksb.sb_status) {
case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */
kmem_cache_free(gfs2_glock_cachep, gl);
+ if (atomic_dec_and_test(&sdp->sd_glock_disposal))
+ wake_up(&sdp->sd_glock_wait);
return;
case -DLM_ECANCEL: /* Cancel while getting lock */
ret |= LM_OUT_CANCELED;
@@ -167,7 +170,8 @@
static void gdlm_put_lock(struct kmem_cache *cachep, void *ptr)
{
struct gfs2_glock *gl = ptr;
- struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct lm_lockstruct *ls = &sdp->sd_lockstruct;
int error;
if (gl->gl_lksb.sb_lkid == 0) {
@@ -183,6 +187,7 @@
(unsigned long long)gl->gl_name.ln_number, error);
return;
}
+ atomic_inc(&sdp->sd_glock_disposal);
}
static void gdlm_cancel(struct gfs2_glock *gl)