gfs2: gfs2_create_inode: Keep glock across iput

On failure, keep the inode glock across the final iput of the new inode
so that gfs2_evict_inode doesn't have to re-acquire the glock.  That
way, gfs2_evict_inode won't need to revalidate the block type.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

fs/gfs2/inode.c

@@ -608,6 +608,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 	if (error)
 		goto fail;
+	gfs2_holder_mark_uninitialized(ghs + 1);
 
 	error = create_ok(dip, name, mode);
 	if (error)
@@ -779,7 +780,6 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 fail_gunlock2:
 	if (io_gl)
 		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
-	gfs2_glock_dq_uninit(ghs + 1);
 fail_free_inode:
 	if (ip->i_gl)
 		gfs2_glock_put(ip->i_gl);
@@ -800,6 +800,8 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 			&GFS2_I(inode)->i_flags);
 		iput(inode);
 	}
+	if (gfs2_holder_initialized(ghs + 1))
+		gfs2_glock_dq_uninit(ghs + 1);
 fail:
 	return error;
 }

fs/gfs2/super.c

@@ -1538,6 +1538,12 @@ static void gfs2_evict_inode(struct inode *inode)
 	if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
 		goto out;
 
+	if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
+		BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
+		gfs2_holder_mark_uninitialized(&gh);
+		goto alloc_failed;
+	}
+
 	/* Must not read inode block until block type has been verified */
 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
 	if (unlikely(error)) {
@@ -1546,11 +1552,9 @@ static void gfs2_evict_inode(struct inode *inode)
 		goto out;
 	}
 
-	if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
-		error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
-		if (error)
-			goto out_truncate;
-	}
+	error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
+	if (error)
+		goto out_truncate;
 
 	if (test_bit(GIF_INVALID, &ip->i_flags)) {
 		error = gfs2_inode_refresh(ip);
@@ -1558,6 +1562,7 @@ static void gfs2_evict_inode(struct inode *inode)
 			goto out_truncate;
 	}
 
+alloc_failed:
 	if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
 	    test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
 		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
@@ -1624,7 +1629,8 @@ static void gfs2_evict_inode(struct inode *inode)
 		}
 		gfs2_holder_uninit(&ip->i_iopen_gh);
 	}
-	gfs2_glock_dq_uninit(&gh);
+	if (gfs2_holder_initialized(&gh))
+		gfs2_glock_dq_uninit(&gh);
 	if (error && error != GLR_TRYFAILED && error != -EROFS)
 		fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
 out: