Dan Horák píše v Po 02. 11. 2009 v 18:34 +0100:
> Hello,
>
> I started to use dracut for preparing generic ramdisk for Fedora/ARM.
> The issue with ramdisks on ARM is that they are usually limited in size
> because they are stored in the internal flash memories whose capacity
> can be 8 or 16 MB (for kernel, ramdisk and other stuff) in the
> commercial devices (like NAS from QNAP). So I used the
> "omit_dracutmodules" option in the config file to drop stuff like i18n,
> plymouth etc. It works, the created ramdisk is usable, but what remains
> quite large are the kernel modules for all filesystems. The ability to
I have solved the problem with filesystem modules with an introduction
of new command line/config file parameter. It controls the list of
filesystem modules that will be included when running in generic mode.
See the attached patch for details.
> limit the list of drivers for block devices would be also nice. Is there
> a way to control what kernel modules get loaded into the ramdisk, like
> some black- or whitelist?
Dan
>From c903db8863923a6f9d32f6ac5e5481b74cb1e75c Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Dan=20Hor=C3=A1k?= <dan@xxxxxxxx>
Date: Tue, 3 Nov 2009 10:39:59 +0100
Subject: [PATCH 1/3] specify a list of kernel filesystem modules to be exlusively included in the initramfs
MIME-Version: 1.0
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Signed-off-by: Dan Horák <dan@xxxxxxxx>
---
dracut | 6 +++++-
dracut.8 | 3 +++
modules.d/90kernel-modules/installkernel | 8 ++++++--
3 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/dracut b/dracut
index 7b9304f..dbc5d73 100755
--- a/dracut
+++ b/dracut
@@ -37,6 +37,8 @@ Creates initial ramdisk images for preloading modules
exclusively include in the initramfs.
--add-drivers [LIST] Specify a space-separated list of kernel
modules to add to the initramfs.
+ --filesystems [LIST] Specify a space-separated list of filesystem kenrel
+ modules to exclusively include in the initramfs.
-k, --kmoddir [DIR] Specify the directory, where to look for kernel
modules
--fwdir [DIR] Specify additional directories, where to look for
@@ -76,6 +78,7 @@ while (($# > 0)); do
-a|--add) add_dracutmodules_l="$2"; shift;;
-d|--drivers) drivers_l="$2"; shift;;
--add-drivers) add_drivers_l="$2"; shift;;
+ --filesystems) filesystems_l="$2"; shift;;
-k|--kmoddir) drivers_dir_l="$2"; shift;;
--fwdir) fw_dir_l="$2"; shift;;
--kernel-only) kernel_only="yes"; nokernel="no";;
@@ -127,6 +130,7 @@ fi
[[ $add_dracutmodules_l ]] && add_dracutmodules="$add_dracutmodules $add_dracutmodules_l"
[[ $drivers_l ]] && drivers=$drivers_l
[[ $add_drivers_l ]] && add_drivers=$add_drivers_l
+[[ $filesystems_l ]] && filesystems=$filesystems_l
[[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
[[ $fw_dir_l ]] && fw_dir=$fw_dir_l
[[ $do_strip_l ]] && do_strip=$do_strip_l
@@ -180,7 +184,7 @@ chmod 755 "$initdir"
export initdir hookdirs dracutbasedir dracutmodules drivers \
fw_dir drivers_dir debug beverbose no_kernel kernel_only \
- add_drivers mdadmconf lvmconf
+ add_drivers mdadmconf lvmconf filesystems
if [[ $kernel_only != yes ]]; then
# Create some directory structure first
diff --git a/dracut.8 b/dracut.8
index 309d0dd..93dafc9 100644
--- a/dracut.8
+++ b/dracut.8
@@ -32,6 +32,9 @@ specify a space-separated list of kernel modules to exclusively include in the i
.BR \-\-add-drivers " \fILIST\fR"
specify a space-separated list of kernel modules to add to the initramfs.
.TP
+.BR \-\-filesystems " \fILIST\fR"
+specify a space-separated list of kernel filesystem modules to exclusively include in the initramfs.
+.TP
.BR \-k ", " \-\-kmoddir " \fI{DIR}\fR
specify the directory, where to look for kernel modules
.TP
diff --git a/modules.d/90kernel-modules/installkernel b/modules.d/90kernel-modules/installkernel
index b5e4c93..77fbe09 100755
--- a/modules.d/90kernel-modules/installkernel
+++ b/modules.d/90kernel-modules/installkernel
@@ -6,9 +6,13 @@ if [[ -z $drivers ]]; then
nm -uPA "$1" | egrep -q "$blockfuncs"
}
instmods pcmcia sd_mod $(filter_kernel_modules block_module_test) "=drivers/pcmcia" =ide
- # if not on hostonly mode, install all known filesystems.
+ # if not on hostonly mode, install all known filesystems if the required list is not set via the filesystems variable
if [[ $hostonly = '' ]]; then
- instmods '=fs'
+ if [[ -z $filesystems ]]; then
+ instmods '=fs'
+ else
+ instmods $filesystems
+ fi
else
instmods $(get_fs_type "/dev/block/$(find_root_block_device)")
fi
--
1.6.3.3
>From d9912f909196d7d53981720b444d1aa23d1edbe6 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Dan=20Hor=C3=A1k?= <dan@xxxxxxxx>
Date: Tue, 3 Nov 2009 11:05:12 +0100
Subject: [PATCH 2/3] add the "filesystems" option into config file
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
Signed-off-by: Dan Horák <dan@xxxxxxxx>
---
dracut.conf | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/dracut.conf b/dracut.conf
index 2ebeeda..44cecaf 100644
--- a/dracut.conf
+++ b/dracut.conf
@@ -9,6 +9,9 @@
# additional kernel modules to the default
#add_drivers=""
+# list of kernel filesystem modules to be loaded into generic initramfs
+#filesystems=""
+
# build initrd only to boot current hardware
#hostonly="-h"
#
--
1.6.3.3
>From 80fe42e3224d4240319ddf56ea3deb807ab1e9aa Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Dan=20Hor=C3=A1k?= <dan@xxxxxxxx>
Date: Tue, 3 Nov 2009 11:06:38 +0100
Subject: [PATCH 3/3] append the filesystems list to the exclusive list of kernel modules
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Dan Horák <dan@xxxxxxxx>
---
modules.d/90kernel-modules/installkernel | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/modules.d/90kernel-modules/installkernel b/modules.d/90kernel-modules/installkernel
index 77fbe09..c739bfc 100755
--- a/modules.d/90kernel-modules/installkernel
+++ b/modules.d/90kernel-modules/installkernel
@@ -19,7 +19,7 @@ if [[ -z $drivers ]]; then
# hardcoded list of exceptions
rm -fr ${initdir}/lib/modules/*/kernel/fs/ocfs2
else
- instmods $drivers
+ instmods $drivers $filesystems
fi
[[ $add_drivers ]] && instmods $add_drivers
--
1.6.3.3
