ocfs2: Change ocfs2_get_*_extent_tree() to ocfs2_init_*_extent_tree()

The original get/put_extent_tree() functions held a reference on
et_root_bh.  However, every single caller already has a safe reference,
making the get/put cycle irrelevant.

We change ocfs2_get_*_extent_tree() to ocfs2_init_*_extent_tree().  It
no longer gets a reference on et_root_bh.  ocfs2_put_extent_tree() is
removed.  Callers now have a simpler init+use pattern.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

6 files changed, 44 insertions, 67 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 06b9bd7..47201b6 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -55,7 +55,7 @@
  *
  * To implement an on-disk btree (extent tree) type in ocfs2, add
  * an ocfs2_extent_tree_operations structure and the matching
- * ocfs2_get_<thingy>_extent_tree() function.  That's pretty much it
+ * ocfs2_init_<thingy>_extent_tree() function.  That's pretty much it
  * for the allocation portion of the extent tree.
  */
 struct ocfs2_extent_tree_operations {
@@ -301,14 +301,13 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
 	.eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
 };
 
-static void __ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
-				    struct inode *inode,
-				    struct buffer_head *bh,
-				    void *obj,
-				    struct ocfs2_extent_tree_operations *ops)
+static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
+				     struct inode *inode,
+				     struct buffer_head *bh,
+				     void *obj,
+				     struct ocfs2_extent_tree_operations *ops)
 {
 	et->et_ops = ops;
-	get_bh(bh);
 	et->et_root_bh = bh;
 	if (!obj)
 		obj = (void *)bh->b_data;
@@ -321,33 +320,28 @@ static void __ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
 		et->et_ops->eo_fill_max_leaf_clusters(inode, et);
 }
 
-void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et,
-				  struct inode *inode,
-				  struct buffer_head *bh)
-{
-	__ocfs2_get_extent_tree(et, inode, bh, NULL, &ocfs2_dinode_et_ops);
-}
-
-void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
-				      struct inode *inode,
-				      struct buffer_head *bh)
+void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
+				   struct inode *inode,
+				   struct buffer_head *bh)
 {
-	__ocfs2_get_extent_tree(et, inode, bh, NULL,
-				&ocfs2_xattr_tree_et_ops);
+	__ocfs2_init_extent_tree(et, inode, bh, NULL, &ocfs2_dinode_et_ops);
 }
 
-void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
 				       struct inode *inode,
-				       struct buffer_head *bh,
-				       struct ocfs2_xattr_value_root *xv)
+				       struct buffer_head *bh)
 {
-	__ocfs2_get_extent_tree(et, inode, bh, xv,
-				&ocfs2_xattr_value_et_ops);
+	__ocfs2_init_extent_tree(et, inode, bh, NULL,
+				 &ocfs2_xattr_tree_et_ops);
 }
 
-void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et)
+void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+					struct inode *inode,
+					struct buffer_head *bh,
+					struct ocfs2_xattr_value_root *xv)
 {
-	brelse(et->et_root_bh);
+	__ocfs2_init_extent_tree(et, inode, bh, xv,
+				 &ocfs2_xattr_value_et_ops);
 }
 
 static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
@@ -6791,10 +6785,9 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode,
 		 * this proves to be false, we could always re-build
 		 * the in-inode data from our pages.
 		 */
-		ocfs2_get_dinode_extent_tree(&et, inode, di_bh);
+		ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
 		ret = ocfs2_insert_extent(osb, handle, inode, &et,
 					  0, block, 1, 0, NULL);
-		ocfs2_put_extent_tree(&et);
 		if (ret) {
 			mlog_errno(ret);
 			goto out_commit;
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 35ad07f..70257c8 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -41,7 +41,7 @@
  *
  * ocfs2_extent_tree becomes the first-class object for extent tree
  * manipulation.  Callers of the alloc.c code need to fill it via one of
- * the ocfs2_get_*_extent_tree() operations below.
+ * the ocfs2_init_*_extent_tree() operations below.
  *
  * ocfs2_extent_tree contains info for the root of the b-tree, it must have a
  * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
@@ -59,21 +59,19 @@ struct ocfs2_extent_tree {
 };
 
 /*
- * ocfs2_*_get_extent_tree() will fill an ocfs2_extent_tree from the
- * specified object buffer.  The bh is referenced until
- * ocfs2_put_extent_tree().
+ * ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the
+ * specified object buffer.
  */
-void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et,
-				  struct inode *inode,
-				  struct buffer_head *bh);
-void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
-				      struct inode *inode,
-				      struct buffer_head *bh);
-void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
+				   struct inode *inode,
+				   struct buffer_head *bh);
+void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
 				       struct inode *inode,
-				       struct buffer_head *bh,
-				       struct ocfs2_xattr_value_root *xv);
-void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et);
+				       struct buffer_head *bh);
+void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+					struct inode *inode,
+					struct buffer_head *bh,
+					struct ocfs2_xattr_value_root *xv);
 
 struct ocfs2_alloc_context;
 int ocfs2_insert_extent(struct ocfs2_super *osb,
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index ed937fa..259775e 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1277,11 +1277,10 @@ static int ocfs2_write_cluster(struct address_space *mapping,
 			goto out;
 		}
 	} else if (unwritten) {
-		ocfs2_get_dinode_extent_tree(&et, inode, wc->w_di_bh);
+		ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
 		ret = ocfs2_mark_extent_written(inode, &et,
 						wc->w_handle, cpos, 1, phys,
 						meta_ac, &wc->w_dealloc);
-		ocfs2_put_extent_tree(&et);
 		if (ret < 0) {
 			mlog_errno(ret);
 			goto out;
@@ -1722,11 +1721,10 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
 		     (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
 		     clusters_to_alloc, extents_to_split);
 
-		ocfs2_get_dinode_extent_tree(&et, inode, wc->w_di_bh);
+		ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
 		ret = ocfs2_lock_allocators(inode, &et,
 					    clusters_to_alloc, extents_to_split,
 					    &data_ac, &meta_ac);
-		ocfs2_put_extent_tree(&et);
 		if (ret) {
 			mlog_errno(ret);
 			goto out;
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 2cdc553..167e6c9 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -1194,7 +1194,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 	handle_t *handle;
 	struct ocfs2_extent_tree et;
 
-	ocfs2_get_dinode_extent_tree(&et, dir, di_bh);
+	ocfs2_init_dinode_extent_tree(&et, dir, di_bh);
 
 	alloc = ocfs2_clusters_for_bytes(sb, bytes);
 
@@ -1363,7 +1363,6 @@ out:
 
 	brelse(dirdata_bh);
 
-	ocfs2_put_extent_tree(&et);
 	return ret;
 }
 
@@ -1485,9 +1484,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
 	spin_lock(&OCFS2_I(dir)->ip_lock);
 	if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
 		spin_unlock(&OCFS2_I(dir)->ip_lock);
-		ocfs2_get_dinode_extent_tree(&et, dir, parent_fe_bh);
+		ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh);
 		num_free_extents = ocfs2_num_free_extents(osb, dir, &et);
-		ocfs2_put_extent_tree(&et);
 		if (num_free_extents < 0) {
 			status = num_free_extents;
 			mlog_errno(status);
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ca3d38a..441c6a9 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -512,12 +512,11 @@ int ocfs2_add_inode_data(struct ocfs2_super *osb,
 	int ret;
 	struct ocfs2_extent_tree et;
 
-	ocfs2_get_dinode_extent_tree(&et, inode, fe_bh);
+	ocfs2_init_dinode_extent_tree(&et, inode, fe_bh);
 	ret = ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
 					   clusters_to_add, mark_unwritten,
 					   &et, handle,
 					   data_ac, meta_ac, reason_ret);
-	ocfs2_put_extent_tree(&et);
 
 	return ret;
 }
@@ -568,10 +567,9 @@ restart_all:
 	     (unsigned long long)OCFS2_I(inode)->ip_blkno,
 	     (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
 	     clusters_to_add);
-	ocfs2_get_dinode_extent_tree(&et, inode, bh);
+	ocfs2_init_dinode_extent_tree(&et, inode, bh);
 	status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 				       &data_ac, &meta_ac);
-	ocfs2_put_extent_tree(&et);
 	if (status) {
 		mlog_errno(status);
 		goto leave;
@@ -1243,11 +1241,10 @@ static int __ocfs2_remove_inode_range(struct inode *inode,
 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 	struct ocfs2_extent_tree et;
 
-	ocfs2_get_dinode_extent_tree(&et, inode, di_bh);
+	ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
 
 	ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
 	if (ret) {
-		ocfs2_put_extent_tree(&et);
 		mlog_errno(ret);
 		return ret;
 	}
@@ -1304,7 +1301,6 @@ out:
 	if (meta_ac)
 		ocfs2_free_alloc_context(meta_ac);
 
-	ocfs2_put_extent_tree(&et);
 	return ret;
 }
 
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 9c3d4dc..1a4de3d 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -211,7 +211,7 @@ static int ocfs2_xattr_extend_allocation(struct inode *inode,
 
 	mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 
-	ocfs2_get_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
+	ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
 
 restart_all:
 
@@ -307,7 +307,6 @@ leave:
 		goto restart_all;
 	}
 
-	ocfs2_put_extent_tree(&et);
 	return status;
 }
 
@@ -325,11 +324,10 @@ static int __ocfs2_remove_xattr_range(struct inode *inode,
 	struct ocfs2_alloc_context *meta_ac = NULL;
 	struct ocfs2_extent_tree et;
 
-	ocfs2_get_xattr_value_extent_tree(&et, inode, root_bh, xv);
+	ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
 
 	ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
 	if (ret) {
-		ocfs2_put_extent_tree(&et);
 		mlog_errno(ret);
 		return ret;
 	}
@@ -385,7 +383,6 @@ out:
 	if (meta_ac)
 		ocfs2_free_alloc_context(meta_ac);
 
-	ocfs2_put_extent_tree(&et);
 	return ret;
 }
 
@@ -3632,7 +3629,7 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
 	     (unsigned long long)OCFS2_I(inode)->ip_blkno,
 	     prev_cpos, prev_blkno);
 
-	ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh);
+	ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
 
 	ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 				    &data_ac, &meta_ac);
@@ -3727,7 +3724,6 @@ leave:
 	if (meta_ac)
 		ocfs2_free_alloc_context(meta_ac);
 
-	ocfs2_put_extent_tree(&et);
 	return ret;
 }
 
@@ -4336,7 +4332,7 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
 	struct ocfs2_cached_dealloc_ctxt dealloc;
 	struct ocfs2_extent_tree et;
 
-	ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh);
+	ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
 
 	ocfs2_init_dealloc_ctxt(&dealloc);
 
@@ -4347,7 +4343,6 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
 
 	ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
 	if (ret) {
-		ocfs2_put_extent_tree(&et);
 		mlog_errno(ret);
 		return ret;
 	}
@@ -4407,7 +4402,6 @@ out:
 
 	ocfs2_run_deallocs(osb, &dealloc);
 
-	ocfs2_put_extent_tree(&et);
 	return ret;
 }