AFS: further write support fixes

Further fixes for AFS write support:

 (1) The afs_send_pages() outer loop must do an extra iteration if it ends
     with 'first == last' because 'last' is inclusive in the page set
     otherwise it fails to send the last page and complete the RxRPC op under
     some circumstances.

 (2) Similarly, the outer loop in afs_pages_written_back() must also do an
     extra iteration if it ends with 'first == last', otherwise it fails to
     clear PG_writeback on the last page under some circumstances.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 04189c47d6a0..1b36f45076ad 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -294,7 +294,7 @@ int afs_send_pages(struct afs_call *call, struct msghdr *msg, struct kvec *iov)
                         put_page(pages[loop]);
                 if (ret < 0)
                         break;
-        } while (first < last);
+        } while (first <= last);
 
         _leave(" = %d", ret);
         return ret;
diff --git a/fs/afs/write.c b/fs/afs/write.c
index aa03d43984b3..67ae4dbf66b3 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -669,7 +669,7 @@ void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call)
         pagevec_init(&pv, 0);
 
         do {
-                _debug("attach %lx-%lx", first, last);
+                _debug("done %lx-%lx", first, last);
 
                 count = last - first + 1;
                 if (count > PAGEVEC_SIZE)
@@ -701,7 +701,7 @@ void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call)
                 }
 
                 __pagevec_release(&pv);
-        } while (first < last);
+        } while (first <= last);
 
         _leave("");
 }