ext4: adjust some functions for reclaiming extents from extent status tree

This commit changes some interfaces in extent status tree because we
need to use inode to count the cached objects in a extent status tree.

Signed-off-by: Zheng Liu <[e-mail]>
Signed-off-by: "Theodore Ts'o" <[e-mail]>
Cc: Jan kara <[e-mail]>

fs/ext4/extents_status.c

···
 
 static struct kmem_cache *ext4_es_cachep;
 
-static int __es_insert_extent(struct ext4_es_tree *tree,
-			      struct extent_status *newes);
-static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
+static int __es_insert_extent(struct inode *inode, struct extent_status *newes);
+static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
 			      ext4_lblk_t end);
 
 int __init ext4_init_es(void)
···
 }
 
 static struct extent_status *
-ext4_es_alloc_extent(ext4_lblk_t lblk, ext4_lblk_t len, ext4_fsblk_t pblk)
+ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len,
+		     ext4_fsblk_t pblk)
 {
 	struct extent_status *es;
 	es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC);
···
 	return es;
 }
 
-static void ext4_es_free_extent(struct extent_status *es)
+static void ext4_es_free_extent(struct inode *inode, struct extent_status *es)
 {
 	kmem_cache_free(ext4_es_cachep, es);
 }
···
 }
 
 static struct extent_status *
-ext4_es_try_to_merge_left(struct ext4_es_tree *tree, struct extent_status *es)
+ext4_es_try_to_merge_left(struct inode *inode, struct extent_status *es)
 {
+	struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
 	struct extent_status *es1;
 	struct rb_node *node;
 
···
 	if (ext4_es_can_be_merged(es1, es)) {
 		es1->es_len += es->es_len;
 		rb_erase(&es->rb_node, &tree->root);
-		ext4_es_free_extent(es);
+		ext4_es_free_extent(inode, es);
 		es = es1;
 	}
 
···
 }
 
 static struct extent_status *
-ext4_es_try_to_merge_right(struct ext4_es_tree *tree, struct extent_status *es)
+ext4_es_try_to_merge_right(struct inode *inode, struct extent_status *es)
 {
+	struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
 	struct extent_status *es1;
 	struct rb_node *node;
 
···
 	if (ext4_es_can_be_merged(es, es1)) {
 		es->es_len += es1->es_len;
 		rb_erase(node, &tree->root);
-		ext4_es_free_extent(es1);
+		ext4_es_free_extent(inode, es1);
 	}
 
 	return es;
 }
 
-static int __es_insert_extent(struct ext4_es_tree *tree,
-			      struct extent_status *newes)
+static int __es_insert_extent(struct inode *inode, struct extent_status *newes)
 {
+	struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
 	struct rb_node **p = &tree->root.rb_node;
 	struct rb_node *parent = NULL;
 	struct extent_status *es;
···
 				    ext4_es_is_unwritten(es))
 					ext4_es_store_pblock(es,
 							     newes->es_pblk);
-				es = ext4_es_try_to_merge_left(tree, es);
+				es = ext4_es_try_to_merge_left(inode, es);
 				goto out;
 			}
 			p = &(*p)->rb_left;
 		} else if (newes->es_lblk > ext4_es_end(es)) {
 			if (ext4_es_can_be_merged(es, newes)) {
 				es->es_len += newes->es_len;
-				es = ext4_es_try_to_merge_right(tree, es);
+				es = ext4_es_try_to_merge_right(inode, es);
 				goto out;
 			}
 			p = &(*p)->rb_right;
···
 		}
 	}
 
-	es = ext4_es_alloc_extent(newes->es_lblk, newes->es_len,
+	es = ext4_es_alloc_extent(inode, newes->es_lblk, newes->es_len,
 				  newes->es_pblk);
 	if (!es)
 		return -ENOMEM;
···
 			  ext4_lblk_t len, ext4_fsblk_t pblk,
 			  unsigned long long status)
 {
-	struct ext4_es_tree *tree;
 	struct extent_status newes;
 	ext4_lblk_t end = lblk + len - 1;
 	int err = 0;
···
 	trace_ext4_es_insert_extent(inode, &newes);
 
 	write_lock(&EXT4_I(inode)->i_es_lock);
-	tree = &EXT4_I(inode)->i_es_tree;
-	err = __es_remove_extent(tree, lblk, end);
+	err = __es_remove_extent(inode, lblk, end);
 	if (err != 0)
 		goto error;
-	err = __es_insert_extent(tree, &newes);
+	err = __es_insert_extent(inode, &newes);
 
 error:
 	write_unlock(&EXT4_I(inode)->i_es_lock);
···
 	return found;
 }
 
-static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
-				 ext4_lblk_t end)
+static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
+			      ext4_lblk_t end)
 {
+	struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
 	struct rb_node *node;
 	struct extent_status *es;
 	struct extent_status orig_es;
···
 				ext4_es_store_pblock(&newes, block);
 			}
 			ext4_es_store_status(&newes, ext4_es_status(&orig_es));
-			err = __es_insert_extent(tree, &newes);
+			err = __es_insert_extent(inode, &newes);
 			if (err) {
 				es->es_lblk = orig_es.es_lblk;
 				es->es_len = orig_es.es_len;
···
 	while (es && ext4_es_end(es) <= end) {
 		node = rb_next(&es->rb_node);
 		rb_erase(&es->rb_node, &tree->root);
-		ext4_es_free_extent(es);
+		ext4_es_free_extent(inode, es);
 		if (!node) {
 			es = NULL;
 			break;
···
 int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
 			  ext4_lblk_t len)
 {
-	struct ext4_es_tree *tree;
 	ext4_lblk_t end;
 	int err = 0;
 
···
 	end = lblk + len - 1;
 	BUG_ON(end < lblk);
 
-	tree = &EXT4_I(inode)->i_es_tree;
-
 	write_lock(&EXT4_I(inode)->i_es_lock);
-	err = __es_remove_extent(tree, lblk, end);
+	err = __es_remove_extent(inode, lblk, end);
 	write_unlock(&EXT4_I(inode)->i_es_lock);
 	ext4_es_print_tree(inode);
 	return err;