linux-ext4 - [PATCH 00/10] extent-based bitmaps for e2fsprogs

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Date:	Sun, 18 Dec 2011 01:42:28 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:	Theodore Ts'o <tytso@....edu>
Subject: [PATCH 00/10] extent-based bitmaps for e2fsprogs

I spent some time playing with Lukas Czerner's rbtree patches.  Here is
a patch set which is based on the latest e2fsprogs sources, and which
doesn't break any library ABI's or API's.  I also threw in regression
tester for bitmaps, and fixed a bug in rb_unmark_bmap() that was found
by the regression tests.

My tests on a number of file systems that I had easy access to seems to
indicate that on pretty much all file systems, using the rbtree based
implementation is a huge win over the bitarray.  (With memory required
after patches being as low as 25% of the memory needed beforehand,
although I believe 40-50% of the memory required in previous releases is
more realistic.)  The one exception is if there are a huge number of
directories, which is the reason for the AUTODIR pseudo backend.

Comments, please!

						- Ted

Lukas Czerner (3):
  libext2fs: add rbtree library
  libext2fs: add a bitmap implementation using rbtree's
  libext2fs: add bitmap statistics

Theodore Ts'o (7):
  libext2fs: add default_bitmap_type to the ext2_filsys structure
  libext2fs: add tests for the bitmap functions
  libext2fs: add pseudo bitmap backend type EXT2FS_BMAP64_AUTODIR
  e2fsck: fix pass5 bug when using two different bitmap backends
  libext2fs: use the rbtree bitmap by default when initializing a file
    system
  e2fsck: use different bitmap types as appropriate
  libext2fs: adjust the description when copying a bitmap

 e2fsck/e2fsck.h               |   20 +
 e2fsck/pass1.c                |   62 ++--
 e2fsck/pass1b.c               |    6 +-
 e2fsck/pass2.c                |    7 +-
 e2fsck/pass3.c                |    7 +-
 e2fsck/pass5.c                |    4 +-
 e2fsck/unix.c                 |    4 +
 e2fsck/util.c                 |   61 +++
 lib/ext2fs/Makefile.in        |   38 ++-
 lib/ext2fs/bitmaps.c          |   14 +-
 lib/ext2fs/blkmap64_ba.c      |    8 +
 lib/ext2fs/blkmap64_rb.c      |  824 +++++++++++++++++++++++++++++++++++++++++
 lib/ext2fs/bmap64.h           |   33 ++
 lib/ext2fs/ext2fs.h           |   15 +-
 lib/ext2fs/ext2fsP.h          |    2 -
 lib/ext2fs/gen_bitmap64.c     |  158 ++++++++-
 lib/ext2fs/icount.c           |    4 +-
 lib/ext2fs/initialize.c       |    1 +
 lib/ext2fs/rbtree.c           |  451 ++++++++++++++++++++++
 lib/ext2fs/rbtree.h           |  180 +++++++++
 lib/ext2fs/tst_bitmaps.c      |  577 ++++++++++++++++++++++++++++
 lib/ext2fs/tst_bitmaps_cmd.ct |   39 ++
 lib/ext2fs/tst_bitmaps_cmds   |   46 +++
 lib/ext2fs/tst_bitmaps_exp    |   92 +++++
 24 files changed, 2600 insertions(+), 53 deletions(-)
 create mode 100644 lib/ext2fs/blkmap64_rb.c
 create mode 100644 lib/ext2fs/rbtree.c
 create mode 100644 lib/ext2fs/rbtree.h
 create mode 100644 lib/ext2fs/tst_bitmaps.c
 create mode 100644 lib/ext2fs/tst_bitmaps_cmd.ct
 create mode 100644 lib/ext2fs/tst_bitmaps_cmds
 create mode 100644 lib/ext2fs/tst_bitmaps_exp

-- 
1.7.8.11.gefc1f.dirty

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