ovl: fix lockdep warning for async write

[linux.git] / fs / overlayfs / file.c

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index a5317216de7368f30a15a49a93a3cbfabe7eb71d..87c362f65448b956f5ca425ac40f728dae408dab 100644 (file)
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -244,6 +244,9 @@ static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req)
        if (iocb->ki_flags & IOCB_WRITE) {
                struct inode *inode = file_inode(orig_iocb->ki_filp);
 
+               /* Actually acquired in ovl_write_iter() */
+               __sb_writers_acquired(file_inode(iocb->ki_filp)->i_sb,
+                                     SB_FREEZE_WRITE);
                file_end_write(iocb->ki_filp);
                ovl_copyattr(ovl_inode_real(inode), inode);
        }
@@ -346,6 +349,9 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
                        goto out;
 
                file_start_write(real.file);
+               /* Pacify lockdep, same trick as done in aio_write() */
+               __sb_writers_release(file_inode(real.file)->i_sb,
+                                    SB_FREEZE_WRITE);
                aio_req->fd = real;
                real.flags = 0;
                aio_req->orig_iocb = iocb;