ocfs2: Add an insertion check to ocfs2_extent_tree_operations.

A couple places check an extent_tree for a valid inode.  We move that
out to add an eo_insert_check() operation.  It can be called from
ocfs2_insert_extent() and elsewhere.

We also have the wrapper calls ocfs2_et_insert_check() and
ocfs2_et_sanity_check() ignore NULL ops.  That way we don't have to
provide useless operations for xattr types.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

fs/ocfs2/alloc.c

@@ -71,6 +71,9 @@ struct ocfs2_extent_tree_operations {
 	void (*eo_update_clusters)(struct inode *inode,
 				   struct ocfs2_extent_tree *et,
 				   u32 new_clusters);
+	int (*eo_insert_check)(struct inode *inode,
+			       struct ocfs2_extent_tree *et,
+			       struct ocfs2_extent_rec *rec);
 	int (*eo_sanity_check)(struct inode *inode, struct ocfs2_extent_tree *et);
 
 	/* These are internal to ocfs2_extent_tree and don't have
@@ -125,6 +128,25 @@ static void ocfs2_dinode_update_clusters(struct inode *inode,
 	spin_unlock(&OCFS2_I(inode)->ip_lock);
 }
 
+static int ocfs2_dinode_insert_check(struct inode *inode,
+				     struct ocfs2_extent_tree *et,
+				     struct ocfs2_extent_rec *rec)
+{
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+	BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
+	mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
+			(OCFS2_I(inode)->ip_clusters != rec->e_cpos),
+			"Device %s, asking for sparse allocation: inode %llu, "
+			"cpos %u, clusters %u\n",
+			osb->dev_str,
+			(unsigned long long)OCFS2_I(inode)->ip_blkno,
+			rec->e_cpos,
+			OCFS2_I(inode)->ip_clusters);
+
+	return 0;
+}
+
 static int ocfs2_dinode_sanity_check(struct inode *inode,
 				     struct ocfs2_extent_tree *et)
 {
@@ -148,6 +170,7 @@ static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
 	.eo_set_last_eb_blk	= ocfs2_dinode_set_last_eb_blk,
 	.eo_get_last_eb_blk	= ocfs2_dinode_get_last_eb_blk,
 	.eo_update_clusters	= ocfs2_dinode_update_clusters,
+	.eo_insert_check	= ocfs2_dinode_insert_check,
 	.eo_sanity_check	= ocfs2_dinode_sanity_check,
 	.eo_fill_root_el	= ocfs2_dinode_fill_root_el,
 };
@@ -186,17 +209,10 @@ static void ocfs2_xattr_value_update_clusters(struct inode *inode,
 	le32_add_cpu(&xv->xr_clusters, clusters);
 }
 
-static int ocfs2_xattr_value_sanity_check(struct inode *inode,
-					  struct ocfs2_extent_tree *et)
-{
-	return 0;
-}
-
 static struct ocfs2_extent_tree_operations ocfs2_xattr_value_et_ops = {
 	.eo_set_last_eb_blk	= ocfs2_xattr_value_set_last_eb_blk,
 	.eo_get_last_eb_blk	= ocfs2_xattr_value_get_last_eb_blk,
 	.eo_update_clusters	= ocfs2_xattr_value_update_clusters,
-	.eo_sanity_check	= ocfs2_xattr_value_sanity_check,
 	.eo_fill_root_el	= ocfs2_xattr_value_fill_root_el,
 };
 
@@ -241,17 +257,10 @@ static void ocfs2_xattr_tree_update_clusters(struct inode *inode,
 	le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, clusters);
 }
 
-static int ocfs2_xattr_tree_sanity_check(struct inode *inode,
-					 struct ocfs2_extent_tree *et)
-{
-	return 0;
-}
-
 static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
 	.eo_set_last_eb_blk	= ocfs2_xattr_tree_set_last_eb_blk,
 	.eo_get_last_eb_blk	= ocfs2_xattr_tree_get_last_eb_blk,
 	.eo_update_clusters	= ocfs2_xattr_tree_update_clusters,
-	.eo_sanity_check	= ocfs2_xattr_tree_sanity_check,
 	.eo_fill_root_el	= ocfs2_xattr_tree_fill_root_el,
 	.eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
 };
@@ -344,10 +353,25 @@ static inline void ocfs2_et_update_clusters(struct inode *inode,
 	et->et_ops->eo_update_clusters(inode, et, clusters);
 }
 
+static inline int ocfs2_et_insert_check(struct inode *inode,
+					struct ocfs2_extent_tree *et,
+					struct ocfs2_extent_rec *rec)
+{
+	int ret = 0;
+
+	if (et->et_ops->eo_insert_check)
+		ret = et->et_ops->eo_insert_check(inode, et, rec);
+	return ret;
+}
+
 static inline int ocfs2_et_sanity_check(struct inode *inode,
 					struct ocfs2_extent_tree *et)
 {
-	return et->et_ops->eo_sanity_check(inode, et);
+	int ret = 0;
+
+	if (et->et_ops->eo_sanity_check)
+		ret = et->et_ops->eo_sanity_check(inode, et);
+	return ret;
 }
 
 static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
@@ -4399,24 +4423,19 @@ static int ocfs2_insert_extent(struct ocfs2_super *osb,
 	struct ocfs2_insert_type insert = {0, };
 	struct ocfs2_extent_rec rec;
 
-	BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
-
 	mlog(0, "add %u clusters at position %u to inode %llu\n",
 	     new_clusters, cpos, (unsigned long long)OCFS2_I(inode)->ip_blkno);
 
-	mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
-			(OCFS2_I(inode)->ip_clusters != cpos),
-			"Device %s, asking for sparse allocation: inode %llu, "
-			"cpos %u, clusters %u\n",
-			osb->dev_str,
-			(unsigned long long)OCFS2_I(inode)->ip_blkno, cpos,
-			OCFS2_I(inode)->ip_clusters);
-
 	memset(&rec, 0, sizeof(rec));
 	rec.e_cpos = cpu_to_le32(cpos);
 	rec.e_blkno = cpu_to_le64(start_blk);
 	rec.e_leaf_clusters = cpu_to_le16(new_clusters);
 	rec.e_flags = flags;
+	status = ocfs2_et_insert_check(inode, et, &rec);
+	if (status) {
+		mlog_errno(status);
+		goto bail;
+	}
 
 	status = ocfs2_figure_insert_type(inode, et, &last_eb_bh, &rec,
 					  &free_records, &insert);