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