linux-ext4 - [PATCH 2/2] mke2fs: Enable lazy_itable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 24 Feb 2014 18:41:06 +0100
From:	Lukas Czerner <lczerner@...hat.com>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, Lukas Czerner <lczerner@...hat.com>
Subject: [PATCH 2/2] 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@...hat.com>
---
 misc/mke2fs.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 957b4b6..e1c6d09 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -2146,7 +2146,15 @@ 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

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html