On Mon, Jan 14, 2013 at 10:10:06PM -0500, Theodore Ts'o wrote:
> On Sun, Jan 13, 2013 at 05:08:15PM +0800, Zheng Liu wrote:
> > From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
> >
> > Bigalloc feature has been used for a long time, but the documentation in mke2fs
> > is still missing. So add it.
> >
> > Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
>
> Applied (with some changes to improve the english/wording).
BTW, I used the following modified text:
bigalloc
This feature enables clustered allocation, so that
the unit of allocation is a power of two number of
blocks. That is, each bit in the what had tradi‐
tionally been known as the block allocation bitmap
now indicates whether a cluster is in use or not,
where a cluster is by default composed of 16 blocks.
This feature can decrease the time spent on doing
block allocation and brings smaller fragmentation,
especially for large files. The size can be speci‐
fied using the -C option.
Warning: The bigalloc feature is still under devel‐
opment, and may not be fully supported with your
kernel or may have various bugs. Please see the web
page http://ext4.wiki.kernel.org/index.php/Bigalloc
for details.
And I populated the page on the ext4 wiki so that when we finally fix
the delalloc/bigalloc problem, we can update the ext4 wiki to reflect
this.
- Ted
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