btrfs: pass the extent map tree's inode to remove_extent_mapping()

Extent maps are always associated to an inode's extent map tree, so
there's no need to pass the extent map tree explicitly to
remove_extent_mapping().

In order to facilitate an upcoming change that adds a shrinker for extent
maps, change remove_extent_mapping() to receive the inode instead of its
extent map tree.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -2457,7 +2457,7 @@ int try_release_extent_mapping(struct page *page, gfp_t mask)
 			 * hurts the fsync performance for workloads with a data
 			 * size that exceeds or is close to the system's memory).
 			 */
-			remove_extent_mapping(map, em);
+			remove_extent_mapping(btrfs_inode, em);
 			/* once for the rb tree */
 			free_extent_map(em);
 next:

fs/btrfs/extent_map.c

@@ -449,16 +449,18 @@ struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
 }
 
 /*
- * Remove an extent_map from the extent tree.
+ * Remove an extent_map from its inode's extent tree.
  *
- * @tree:	extent tree to remove from
+ * @inode:	the inode the extent map belongs to
  * @em:		extent map being removed
  *
- * Remove @em from @tree.  No reference counts are dropped, and no checks
- * are done to see if the range is in use.
+ * Remove @em from the extent tree of @inode.  No reference counts are dropped,
+ * and no checks are done to see if the range is in use.
  */
-void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em)
+void remove_extent_mapping(struct btrfs_inode *inode, struct extent_map *em)
 {
+	struct extent_map_tree *tree = &inode->extent_tree;
+
 	lockdep_assert_held_write(&tree->lock);
 
 	WARN_ON(em->flags & EXTENT_FLAG_PINNED);
@@ -633,8 +635,10 @@ int btrfs_add_extent_mapping(struct btrfs_inode *inode,
  * if needed. This avoids searching the tree, from the root down to the first
  * extent map, before each deletion.
  */
-static void drop_all_extent_maps_fast(struct extent_map_tree *tree)
+static void drop_all_extent_maps_fast(struct btrfs_inode *inode)
 {
+	struct extent_map_tree *tree = &inode->extent_tree;
+
 	write_lock(&tree->lock);
 	while (!RB_EMPTY_ROOT(&tree->map.rb_root)) {
 		struct extent_map *em;
@@ -643,7 +647,7 @@ static void drop_all_extent_maps_fast(struct extent_map_tree *tree)
 		node = rb_first_cached(&tree->map);
 		em = rb_entry(node, struct extent_map, rb_node);
 		em->flags &= ~(EXTENT_FLAG_PINNED | EXTENT_FLAG_LOGGING);
-		remove_extent_mapping(tree, em);
+		remove_extent_mapping(inode, em);
 		free_extent_map(em);
 		cond_resched_rwlock_write(&tree->lock);
 	}
@@ -676,7 +680,7 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
 	WARN_ON(end < start);
 	if (end == (u64)-1) {
 		if (start == 0 && !skip_pinned) {
-			drop_all_extent_maps_fast(em_tree);
+			drop_all_extent_maps_fast(inode);
 			return;
 		}
 		len = (u64)-1;
@@ -854,7 +858,7 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
 				ASSERT(!split);
 				btrfs_set_inode_full_sync(inode);
 			}
-			remove_extent_mapping(em_tree, em);
+			remove_extent_mapping(inode, em);
 		}
 
 		/*

fs/btrfs/extent_map.h

@@ -120,7 +120,7 @@ static inline u64 extent_map_end(const struct extent_map *em)
 void extent_map_tree_init(struct extent_map_tree *tree);
 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
 					 u64 start, u64 len);
-void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
+void remove_extent_mapping(struct btrfs_inode *inode, struct extent_map *em);
 int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre,
 		     u64 new_logical);
 

fs/btrfs/tests/extent-map-tests.c

@@ -11,8 +11,9 @@
 #include "../disk-io.h"
 #include "../block-group.h"
 
-static int free_extent_map_tree(struct extent_map_tree *em_tree)
+static int free_extent_map_tree(struct btrfs_inode *inode)
 {
+	struct extent_map_tree *em_tree = &inode->extent_tree;
 	struct extent_map *em;
 	struct rb_node *node;
 	int ret = 0;
@@ -21,7 +22,7 @@ static int free_extent_map_tree(struct extent_map_tree *em_tree)
 	while (!RB_EMPTY_ROOT(&em_tree->map.rb_root)) {
 		node = rb_first_cached(&em_tree->map);
 		em = rb_entry(node, struct extent_map, rb_node);
-		remove_extent_mapping(em_tree, em);
+		remove_extent_mapping(inode, em);
 
 #ifdef CONFIG_BTRFS_DEBUG
 		if (refcount_read(&em->refs) != 1) {
@@ -142,7 +143,7 @@ static int test_case_1(struct btrfs_fs_info *fs_info, struct btrfs_inode *inode)
 	}
 	free_extent_map(em);
 out:
-	ret2 = free_extent_map_tree(em_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;
 
@@ -237,7 +238,7 @@ static int test_case_2(struct btrfs_fs_info *fs_info, struct btrfs_inode *inode)
 	}
 	free_extent_map(em);
 out:
-	ret2 = free_extent_map_tree(em_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;
 
@@ -313,7 +314,7 @@ static int __test_case_3(struct btrfs_fs_info *fs_info,
 	}
 	free_extent_map(em);
 out:
-	ret2 = free_extent_map_tree(em_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;
 
@@ -435,7 +436,7 @@ static int __test_case_4(struct btrfs_fs_info *fs_info,
 	}
 	free_extent_map(em);
 out:
-	ret2 = free_extent_map_tree(em_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;
 
@@ -679,7 +680,7 @@ static int test_case_5(struct btrfs_fs_info *fs_info, struct btrfs_inode *inode)
 	if (ret)
 		goto out;
 out:
-	ret2 = free_extent_map_tree(&inode->extent_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;
 
@@ -738,7 +739,7 @@ static int test_case_6(struct btrfs_fs_info *fs_info, struct btrfs_inode *inode)
 	ret = 0;
 out:
 	free_extent_map(em);
-	ret2 = free_extent_map_tree(em_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;
 
@@ -876,7 +877,7 @@ static int test_case_7(struct btrfs_fs_info *fs_info, struct btrfs_inode *inode)
 	ret2 = unpin_extent_cache(inode, 0, SZ_16K, 0);
 	if (ret == 0)
 		ret = ret2;
-	ret2 = free_extent_map_tree(em_tree);
+	ret2 = free_extent_map_tree(inode);
 	if (ret == 0)
 		ret = ret2;