[Cluster-devel] [PATCH 3/3] Revert "GFS2: Wait for iopen glock dequeues"

[Andreas Gruenbacher <agruenba@redhat.com>]

Revert commit 86d067a797d4e8546a7c92b985f31e8cd3ec39ad: it turns out
that waiting for iopen glock dequeues here isn't needed anymore because
the bugs that commit was meant to fix have been fixed otherwise.

In addition, we want to avoid waiting on glocks in gfs2_evict_inode in
shrinker context because the shrinker may be invoked on behalf of DLM,
in which case calling into DLM again would deadlock.  This commit makes
the described scenario less likely without completely avoiding it; it's
still a step in the right direction, though.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/gfs2/inode.c | 3 +--
 fs/gfs2/super.c | 8 +++-----
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index e279c3c..de919f1 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -202,8 +202,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 fail_refresh:
 	ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
 	ip->i_iopen_gh.gh_gl->gl_object = NULL;
-	gfs2_glock_dq_wait(&ip->i_iopen_gh);
-	gfs2_holder_uninit(&ip->i_iopen_gh);
+	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 fail_put:
 	if (io_gl)
 		gfs2_glock_put(io_gl);
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 2a9a830..29b0473 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1539,8 +1539,7 @@ static void gfs2_evict_inode(struct inode *inode)
 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
 	if (unlikely(error)) {
 		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
-		gfs2_glock_dq_wait(&ip->i_iopen_gh);
-		gfs2_holder_uninit(&ip->i_iopen_gh);
+		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 		goto out;
 	}
 
@@ -1618,7 +1617,7 @@ static void gfs2_evict_inode(struct inode *inode)
 	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
 		if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
 			ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
-			gfs2_glock_dq_wait(&ip->i_iopen_gh);
+			gfs2_glock_dq(&ip->i_iopen_gh);
 		}
 		gfs2_holder_uninit(&ip->i_iopen_gh);
 	}
@@ -1640,8 +1639,7 @@ static void gfs2_evict_inode(struct inode *inode)
 	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
 		ip->i_iopen_gh.gh_gl->gl_object = NULL;
 		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
-		gfs2_glock_dq_wait(&ip->i_iopen_gh);
-		gfs2_holder_uninit(&ip->i_iopen_gh);
+		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 	}
 }
 
-- 
2.7.4