1 files changed, 12 insertions, 7 deletions

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 160a5489a939..31ba0935e32e 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -664,7 +664,6 @@ static inline int dio_new_bio(struct dio *dio, struct dio_submit *sdio,
                 goto out;
         sector = start_sector << (sdio->blkbits - 9);
         nr_pages = min(sdio->pages_in_io, bio_get_nr_vecs(map_bh->b_bdev));
-        nr_pages = min(nr_pages, BIO_MAX_PAGES);
         BUG_ON(nr_pages <= 0);
         dio_bio_alloc(dio, sdio, map_bh->b_bdev, sector, nr_pages);
         sdio->boundary = 0;
@@ -1194,13 +1193,19 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
         }
 
         /*
-         * For file extending writes updating i_size before data
-         * writeouts complete can expose uninitialized blocks. So
-         * even for AIO, we need to wait for i/o to complete before
-         * returning in this case.
+         * For file extending writes updating i_size before data writeouts
+         * complete can expose uninitialized blocks in dumb filesystems.
+         * In that case we need to wait for I/O completion even if asked
+         * for an asynchronous write.
          */
-        dio->is_async = !is_sync_kiocb(iocb) && !((rw & WRITE) &&
-                (end > i_size_read(inode)));
+        if (is_sync_kiocb(iocb))
+                dio->is_async = false;
+        else if (!(dio->flags & DIO_ASYNC_EXTEND) &&
+            (rw & WRITE) && end > i_size_read(inode))
+                dio->is_async = false;
+        else
+                dio->is_async = true;
+
         dio->inode = inode;
         dio->rw = rw;