Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull read/write fix from Al Viro:
"file_start_write()/file_end_write() got mixed into vfs_iter_write() by
accident; that's a deadlock for all existing callers - they already do
that, some - quite a bit outside.

Easily fixed, fortunately"

* 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
move file_{start,end}_write() out of do_iter_write()

fs/read_write.c

···
 	if (ret < 0)
 		return ret;
 
-	file_start_write(file);
 	if (file->f_op->write_iter)
 		ret = do_iter_readv_writev(file, iter, pos, WRITE, flags);
 	else
 		ret = do_loop_readv_writev(file, iter, pos, WRITE, flags);
-	file_end_write(file);
 	if (ret > 0)
 		fsnotify_modify(file);
 	return ret;
···
 
 	ret = import_iovec(WRITE, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
 	if (ret >= 0) {
+		file_start_write(file);
 		ret = do_iter_write(file, &iter, pos, flags);
+		file_end_write(file);
 		kfree(iov);
 	}
 	return ret;
···
 
 	ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);
 	if (ret >= 0) {
+		file_start_write(file);
 		ret = do_iter_write(file, &iter, pos, flags);
+		file_end_write(file);
 		kfree(iov);
 	}
 	if (ret > 0)