btrfs: pass btrfs_inode to btrfs_merge_delalloc_extent

The function is for internal interfaces so we should use the
btrfs_inode.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/btrfs_inode.h

@@ -475,7 +475,7 @@ struct inode *btrfs_new_subvol_inode(struct user_namespace *mnt_userns,
 			        u32 bits);
 void btrfs_clear_delalloc_extent(struct inode *inode,
 				 struct extent_state *state, u32 bits);
-void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
+void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new,
 				 struct extent_state *other);
 void btrfs_split_delalloc_extent(struct inode *inode,
 				 struct extent_state *orig, u64 split);

fs/btrfs/extent-io-tree.c

@@ -347,8 +347,7 @@ static void merge_state(struct extent_io_tree *tree, struct extent_state *state)
 	if (other && other->end == state->start - 1 &&
 	    other->state == state->state) {
 		if (tree->inode)
-			btrfs_merge_delalloc_extent(&tree->inode->vfs_inode, state,
-						    other);
+			btrfs_merge_delalloc_extent(tree->inode, state, other);
 		state->start = other->start;
 		rb_erase(&other->rb_node, &tree->state);
 		RB_CLEAR_NODE(&other->rb_node);
@@ -358,8 +357,7 @@ static void merge_state(struct extent_io_tree *tree, struct extent_state *state)
 	if (other && other->start == state->end + 1 &&
 	    other->state == state->state) {
 		if (tree->inode)
-			btrfs_merge_delalloc_extent(&tree->inode->vfs_inode, state,
-						    other);
+			btrfs_merge_delalloc_extent(tree->inode, state, other);
 		state->end = other->end;
 		rb_erase(&other->rb_node, &tree->state);
 		RB_CLEAR_NODE(&other->rb_node);

fs/btrfs/inode.c

@@ -2314,10 +2314,10 @@ void btrfs_split_delalloc_extent(struct inode *inode,
  * that are just merged onto old extents, such as when we are doing sequential
  * writes, so we can properly account for the metadata space we'll need.
  */
-void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
+void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new,
 				 struct extent_state *other)
 {
-	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	u64 new_size, old_size;
 	u32 num_extents;
 
@@ -2332,9 +2332,9 @@ void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
 
 	/* we're not bigger than the max, unreserve the space and go */
 	if (new_size <= fs_info->max_extent_size) {
-		spin_lock(&BTRFS_I(inode)->lock);
-		btrfs_mod_outstanding_extents(BTRFS_I(inode), -1);
-		spin_unlock(&BTRFS_I(inode)->lock);
+		spin_lock(&inode->lock);
+		btrfs_mod_outstanding_extents(inode, -1);
+		spin_unlock(&inode->lock);
 		return;
 	}
 
@@ -2363,9 +2363,9 @@ void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
 	if (count_max_extents(fs_info, new_size) >= num_extents)
 		return;
 
-	spin_lock(&BTRFS_I(inode)->lock);
-	btrfs_mod_outstanding_extents(BTRFS_I(inode), -1);
-	spin_unlock(&BTRFS_I(inode)->lock);
+	spin_lock(&inode->lock);
+	btrfs_mod_outstanding_extents(inode, -1);
+	spin_unlock(&inode->lock);
 }
 
 static void btrfs_add_delalloc_inodes(struct btrfs_root *root,