[OE-core] [PATCH 0/7] Create ext* filesystems using debugfs

[Robert Yang]

===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.
  - Replace the current genext2fs command with mkdebugfs.sh in
    image_types.bbclass.
  - The new steps to generate the root filesystem are:
    -> use "dd" command to make rootfs.ext* file
    -> 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

* 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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1.7.11.2