mm/filemap.c: Use existing variable

Use the variable write_len instead of ov_iter_count(from).

Link: http://lkml.kernel.org/r/1537375855-2088-1-git-send-email-leviathan0992@gmail.com
Signed-off-by: haiqing.shq <leviathan0992@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 41586009fa42..0b8c6de6d995 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3027,7 +3027,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
         if (iocb->ki_flags & IOCB_NOWAIT) {
                 /* If there are pages to writeback, return */
                 if (filemap_range_has_page(inode->i_mapping, pos,
-                                           pos + iov_iter_count(from)))
+                                           pos + write_len))
                         return -EAGAIN;
         } else {
                 written = filemap_write_and_wait_range(mapping, pos,