Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[mirror_ubuntu-bionic-kernel.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 870971e209670c99a335bc05903f7f12326b9882..db250d0e05655a2e4b72e4f7a7834964a641c86d 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2926,9 +2926,15 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
         * we're writing.  Either one is a pretty crazy thing to do,
         * so we don't support it 100%.  If this invalidation
         * fails, tough, the write still worked...
+        *
+        * Most of the time we do not need this since dio_complete() will do
+        * the invalidation for us. However there are some file systems that
+        * do not end up with dio_complete() being called, so let's not break
+        * them by removing it completely
         */
-       invalidate_inode_pages2_range(mapping,
-                               pos >> PAGE_SHIFT, end);
+       if (mapping->nrpages)
+               invalidate_inode_pages2_range(mapping,
+                                       pos >> PAGE_SHIFT, end);
 
        if (written > 0) {
                pos += written;