From 165af99c57a686444167fcef56f9fae31d815887 Mon Sep 17 00:00:00 2001
From: Lukas Czerner <lczerner@redhat.com>
Date: Mon, 24 Feb 2014 18:41:06 +0100
Subject: [PATCH 4/8] mke2fs: Enable lazy_itable_init on newer kernel by
default
Currently is used did not specified lazy_itable_init option we rely on
information from ext4 module exported via sysfs interface. However if
the ext4 module is not loaded it will not be enabled even though kernel
might support it.
With this commit we set the default according to the kernel version,
however we still allow it to be set manually via extended option or be
enabled in case that ext4 module advertise that it supports this
feature.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
misc/mke2fs.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 76ea60b..23a988e 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -1998,7 +1998,15 @@ profile_error:
blocksize, sys_page_size);
}
- lazy_itable_init = 0;
+ /*
+ * On newer kernels we do have lazy_itable_init support. So pick the
+ * right default in case ext4 module is not loaded.
+ */
+ if (is_before_linux_ver(2, 6, 37))
+ lazy_itable_init = 0;
+ else
+ lazy_itable_init = 1;
+
if (access("/sys/fs/ext4/features/lazy_itable_init", R_OK) == 0)
lazy_itable_init = 1;
--
1.8.3.1