On Sat, Apr 21, 2012 at 03:30:37PM +0300, Touko Korpela wrote:
> Package: e2fsprogs
> Version: 1.42.2-2
> Severity: wishlist
> 
> E2fsprogs 1.42 release notes says:
> >This release of e2fsprogs has support for clustered allocation.  This
> >reduces the number of block (now cluster) bitmaps by allocating and
> >deallocating space in contiguous power-of-2 collections of blocks,
> >which are called clustered.  This is a file system level feature,
> >called 'bigalloc', which must be enabled when the file system is
> >initially formatted.  It is not backwards compatible with older
> >kernels.
> 
> mke2fs manpage should document how to create such filesystems and what is
> minimum kernel version that support it

I managed to create bigalloc fs with "mkfs.ext4 -C<cluster-size> -O bigalloc"
Filesystem seems to work (only lightly tested) under kernel 3.2.15

Shouldn't mkfs be smart and turn "bigalloc" feature on automatically when
"-C" is used?

Also should be documented issues that this feature causes in resizing support.
Am I correct saying that off-line resizing isn't supported and on-line resizing
needs at least kernel version 3.3?



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