[PATCH v4 2/7] fuse: refactor finished writeback stats updates into helper function

[Joanne Koong <joannelkoong@xxxxxxxxx>]

Move the logic for updating the bdi and page stats for a finished
writeback into a separate helper function, where it can be called from
both fuse_writepage_finish() and fuse_writepage_add() (in the case
where there is already an auxiliary write request for the page).

No functional changes added.

Signed-off-by: Joanne Koong <joannelkoong@xxxxxxxxx>
Suggested by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
---
 fs/fuse/file.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 63fd5fc6872e..320fa26b23e8 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1769,19 +1769,25 @@ static void fuse_writepage_free(struct fuse_writepage_args *wpa)
 	kfree(wpa);
 }
 
+static void fuse_writepage_finish_stat(struct inode *inode, struct page *page)
+{
+	struct backing_dev_info *bdi = inode_to_bdi(inode);
+
+	dec_wb_stat(&bdi->wb, WB_WRITEBACK);
+	dec_node_page_state(page, NR_WRITEBACK_TEMP);
+	wb_writeout_inc(&bdi->wb);
+}
+
 static void fuse_writepage_finish(struct fuse_writepage_args *wpa)
 {
 	struct fuse_args_pages *ap = &wpa->ia.ap;
 	struct inode *inode = wpa->inode;
 	struct fuse_inode *fi = get_fuse_inode(inode);
-	struct backing_dev_info *bdi = inode_to_bdi(inode);
 	int i;
 
-	for (i = 0; i < ap->num_pages; i++) {
-		dec_wb_stat(&bdi->wb, WB_WRITEBACK);
-		dec_node_page_state(ap->pages[i], NR_WRITEBACK_TEMP);
-		wb_writeout_inc(&bdi->wb);
-	}
+	for (i = 0; i < ap->num_pages; i++)
+		fuse_writepage_finish_stat(inode, ap->pages[i]);
+
 	wake_up(&fi->page_waitq);
 }
 
@@ -2203,11 +2209,7 @@ static bool fuse_writepage_add(struct fuse_writepage_args *new_wpa,
 	spin_unlock(&fi->lock);
 
 	if (tmp) {
-		struct backing_dev_info *bdi = inode_to_bdi(new_wpa->inode);
-
-		dec_wb_stat(&bdi->wb, WB_WRITEBACK);
-		dec_node_page_state(new_ap->pages[0], NR_WRITEBACK_TEMP);
-		wb_writeout_inc(&bdi->wb);
+		fuse_writepage_finish_stat(new_wpa->inode, new_ap->pages[0]);
 		fuse_writepage_free(new_wpa);
 	}
 
-- 
2.43.5