On 02/26/2013 01:24 AM, Robert Yang wrote:
===Contents===
* Summary
* Brief design
* Test info
* The rootfs generation time changes
* The rootfs size changes
* Summary:
The ext3 and ext4 rootfs generation relied on genext2fs and flipping
some bits to "convert" the ext2 filesystem to ext3 and ext4 in the past,
now we use the mkfs.ext3/ext4 to create the image, and use mkdebugfs.sh
to copy the files to the image.
* Brief design:
- Upgrade the e2fsprogs to the update to date version (the git
repo) which contains the "symlink" command in debugfs shell that we
need.
This should really be an RFC
This work was intended to be a step toward incorporating it into
genext2fs directly. At this point we do not want to switch to the GIT
version of e2fsprogs, there is an update to e2fsprogs pending on the
patch queue that addes the symlink support (crossed with your request)
- Replace the current genext2fs command with mkdebugfs.sh in
image_types.bbclass.
The goal is to change genext2fs to support a rootfs option an not
replace it with mkdebugfs.
- The new steps to generate the root filesystem are:
-> use "dd" command to make rootfs.ext* file
Why the dd?
-> run "mkfs.ext* rootfs.ext*" to create the filesystem
-> run the mkdebugfs.sh to generate the root filesystem
* Test info: (MACHINE = qemuarm, IMAGE_FSTYPES = "ext2 ext3 ext4 tar.bz2")
$ bitbake core-image-minimal core-image-sato meta-toolchain-sdk
core-image-sato-sdk
$ runqemu runqemu qemuarm core-image-sato ext3
$ runqemu runqemu qemuarm core-image-minimal ext3
All of them are OK
What about booting an ext4 image, part of the goal of this was to enable
ext4.
* The rootfs generation time changes
- For a core-image-minimal generation (IMAGE_FSTYPES="tar.bz2 ext3"):
Before:
$ time bitbake core-image-minimal
real 1m10.823s
user 0m37.108s
sys 0m15.894s
After:
$ time bitbake core-image-minimal
real 1m17.501s
user 0m29.304s
sys 0m20.731s
# 7 seconds lost.
- For a core-image-sato generation (IMAGE_FSTYPES="tar.bz2 ext3"):
Before:
$ time bitbake core-image-sato
real 11m10.645s
user 2m43.503s
sys 1m1.589s
After:
$ time bitbake core-image-sato
real 11m53.131s
user 3m18.988s
sys 2m8.350s
# 43 seconds lost.
* The rootfs size changes
- The image size are the same by "ls -h", but different by "du -sh":
(core-image-sato)
$ ls -lh BEFORE.rootfs.ext3 AFTER.rootfs.ext3 | awk '{print $5"\t"$NF}'
357M BEFORE.rootfs.ext3
357M AFTER.rootfs.ext3
$ du -sh BEFORE.rootfs.ext3 AFTER.rootfs.ext3
238M BEFORE.rootfs.ext3
357M AFTER.rootfs.ext3
It seems that the genext2fs has optimized the rootfs generation.
// Robert
The following changes since commit 2cc4fe4a0874c42421b1bf3fa100160a9e60a9da:
upstream_tracking.inc: Coonectivity and multimedia packages updates
(2013-02-25 05:58:20 -0800)
are available in the git repository at:
git://git.pokylinux.org/poky-contrib robert/e2fsprogs
http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=robert/e2fsprogs
Robert Yang (7):
e2fsprogs: upgrade to the git version (rename only)
e2fsprogs: upgrade to the git version
e2fsprogs: add the original mkdebugfs.sh
mkdebugfs.sh: convert the tab to 4 spaces
mkdebugfs.sh: several fixes
e2fsprogs: ship mkfsdebug.sh
image_types.bbclass: replace genext2fs with mkdebugfs.sh
meta/classes/image_types.bbclass | 45 +++++-------
meta/recipes-devtools/e2fsprogs/e2fsprogs.inc | 4 +-
.../{e2fsprogs-1.42.6 => e2fsprogs}/acinclude.m4 | 0
.../fallocate.patch | 0
.../e2fsprogs/e2fsprogs/mkdebugfs.sh | 82 ++++++++++++++++++++++
.../{e2fsprogs-1.42.6 => e2fsprogs}/mkdir.patch | 0
.../remove.ldconfig.call.patch | 0
.../{e2fsprogs_1.42.6.bb => e2fsprogs_git.bb} | 6 +-
8 files changed, 106 insertions(+), 31 deletions(-)
rename meta/recipes-devtools/e2fsprogs/{e2fsprogs-1.42.6 =>
e2fsprogs}/acinclude.m4 (100%)
rename meta/recipes-devtools/e2fsprogs/{e2fsprogs-1.42.6 =>
e2fsprogs}/fallocate.patch (100%)
create mode 100644 meta/recipes-devtools/e2fsprogs/e2fsprogs/mkdebugfs.sh
rename meta/recipes-devtools/e2fsprogs/{e2fsprogs-1.42.6 =>
e2fsprogs}/mkdir.patch (100%)
rename meta/recipes-devtools/e2fsprogs/{e2fsprogs-1.42.6 =>
e2fsprogs}/remove.ldconfig.call.patch (100%)
rename meta/recipes-devtools/e2fsprogs/{e2fsprogs_1.42.6.bb =>
e2fsprogs_git.bb} (92%)
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