[PATCH 3.18 064/108] fuse: decrement NR_WRITEBACK_TEMP on the right page

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszeredi@xxxxxxxxxx>

commit a2ebba824106dabe79937a9f29a875f837e1b6d4 upstream.

NR_WRITEBACK_TEMP is accounted on the temporary page in the request, not
the page cache page.

Fixes: 8b284dc47291 ("fuse: writepages: handle same page rewrites")
Cc: <stable@xxxxxxxxxxxxxxx> # v3.13
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/fuse/file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1844,7 +1844,7 @@ static bool fuse_writepage_in_flight(str
 		spin_unlock(&fc->lock);
 
 		dec_bdi_stat(bdi, BDI_WRITEBACK);
-		dec_zone_page_state(page, NR_WRITEBACK_TEMP);
+		dec_zone_page_state(new_req->pages[0], NR_WRITEBACK_TEMP);
 		bdi_writeout_inc(bdi);
 		fuse_writepage_free(fc, new_req);
 		fuse_request_free(new_req);