Re: Is there a "make hole" (truncate in middle) syscall?

Ville Herva
2003-12-05T07:09:41Z

On Thu, Dec 04, 2003 at 06:03:12PM -0800, you [Mike Fedyk] wrote:
>
> o per file compression
>
> Ext2/3 has a flag for it, but support hasn't been implemented.

It has (for 2.0, 2.2, 2.4 ext2) - it just was never merged into baseline.

2.4:
http://sourceforge.net/projects/e2compr/
2.2:
http://his.luky.org/ftp/mirrors/e2compr/www.netspace.net.au/%257Ereiter/e2compr/

FWIW, I have a 2.2 server keeping >20 workstations' daily backups on
compressed ext2:

/dev/md2 441G 154G 287G 35% /backup-versioned
/dev/md4 144G 141G 3.5G 98% /backup-versioned2

and it's really solid.

> o make hole support

According to Andreas Dilger, Peter Braam has implemented this (sys_punch):
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=utf-8&threadm=linux.kernel.200106291838.f5TIcbAM015809%40webber.adilger.int&rnum=2&prev=/groups%3Fhl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3Dutf-8%26q%3Dhole%2Bpunch%2Bgroup%253Amlist.linux.kernel%26btnG%3DGoogle%2BSearch

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