[PATCH] afs: Fix afs_launder_page() to set correct start file position

[David Howells <dhowells@redhat.com>]

Fix afs_launder_page() to set the starting position of the StoreData RPC at
the offset into the page at which the modified data starts instead of at
the beginning of the page (the iov_iter is correctly offset).

The offset got lost during the conversion to passing an iov_iter into
afs_store_data().

Fixes: bd80d8a80e12 ("afs: Use ITER_XARRAY for writing")
Signed-off-by: David Howells <dhowells@redhat.com>
---

 fs/afs/write.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/afs/write.c b/fs/afs/write.c
index fb7d5c1cabde..fff4c7d88e0d 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -950,8 +950,8 @@ int afs_launder_page(struct page *page)
 		iov_iter_bvec(&iter, WRITE, bv, 1, bv[0].bv_len);
 
 		trace_afs_page_dirty(vnode, tracepoint_string("launder"), page);
-		ret = afs_store_data(vnode, &iter, (loff_t)page->index * PAGE_SIZE,
-				     true);
+		ret = afs_store_data(vnode, &iter,
+				     (loff_t)page->index * PAGE_SIZE + f, true);
 	}
 
 	trace_afs_page_dirty(vnode, tracepoint_string("laundered"), page);