From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Marshall Subject: Re: [RFC] Per-file compression Date: Sun, 19 Apr 2015 14:15:01 -0700 Message-ID: <55341ad8.c7bb420a.053f.ffffeff5@mx.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: base64 Cc: linux-fsdevel , Richard Weinberger To: Theodore Ts'o Return-path: Received: from mail-pd0-f178.google.com ([209.85.192.178]:34453 "EHLO mail-pd0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752387AbbDSVPG (ORCPT ); Sun, 19 Apr 2015 17:15:06 -0400 Received: by pdbqa5 with SMTP id qa5so187161106pdb.1 for ; Sun, 19 Apr 2015 14:15:05 -0700 (PDT) Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Ck9uIEFwciAxOCwgMjAxNSA0OjA5IFBNLCBUaGVvZG9yZSBUcydvIDx0eXRzb0BtaXQuZWR1PiB3 cm90ZToKPgo+IE9uIFNhdCwgQXByIDE4LCAyMDE1IGF0IDEwOjA2OjE0QU0gKzAyMDAsIFJpY2hh cmQgV2VpbmJlcmdlciB3cm90ZTogCj4gPiBPbiBTYXQsIEFwciAxOCwgMjAxNSBhdCAxMjoyMCBB TSwgVG9tIE1hcnNoYWxsIDx0b21AY3luZ24uY29tPiB3cm90ZTogCj4gPiA+IFdlIGFyZSBydW5u aW5nIGludG8gc3BhY2UgaXNzdWVzIHdoZW4gdXBncmFkaW5nIEFuZHJvaWQgZGV2aWNlcyB0byB0 aGUgCj4gPiA+IGxhdGVzdCB2ZXJzaW9uLsKgIFRoaXMgaXNzdWUgaXMgcGFydGljdWxhcmx5IHRy b3VibGVzb21lIGZvciA2NC1iaXQgZGV2aWNlcyAKPiA+ID4gdGhhdCBpbml0aWFsbHkgc2hpcHBl ZCB3aXRob3V0IDY0LWJpdCBzdXBwb3J0LCBhcyB0aGUgbXVsdGktbGliIGZpbGVzIG5lYXJseSAK PiA+ID4gZG91YmxlIHRoZSBzcGFjZSByZXF1aXJlbWVudHMuwqAgQXMgaXQgaGFwcGVucywgbWFu eSBzeXN0ZW0gZmlsZXMgYXJlIHF1aXRlIAo+ID4gPiBjb21wcmVzc2libGUgLS0gbmFtZWx5IHNo YXJlZCBsaWJzIGFuZCBhcGsgZmlsZXMuwqAgU28gaW1wbGVtZW50aW5nIAo+ID4gPiBmaWxlc3lz dGVtIGNvbXByZXNzaW9uIGlzIGEgbmF0dXJhbCBzb2x1dGlvbi4gCj4KPiBUb20sIGhhdmUgeW91 IHZlcmlmaWVkIHdoZXRoZXIgb3Igbm90IHRoaXMgYXBwcm9hY2ggYWN0dWFsbHkgaXMgCj4gc3Vm ZmljaWVudCB0byBhZGRyZXNzIHRoZSBwcm9ibGVtIHlvdSBhcmUgdHJ5aW5nIHRvIHNvbHZlPyAK PiBTcGVjaWZpY2FsbHksIChhKSBjYW4geW91IGdldCBlbm91Z2ggc3BhY2UgY29tcHJlc3Npb24g dGhhdCBpdCB3aWxsIAo+IG1ha2UgdGhpbmdzIGZpdD/CoCBHaXZlbiB0aGF0IGFwayBmaWxlcyBh cmUgYWxyZWFkeSBjb21wcmVzc2VkIHVzaW5nIAo+IHppcCwgSSdtIGEgYml0IHN1cnByaXNlZCB5 b3Ugd291bGQgZ2V0IGVub3VnaCBvZiBhIGNvbXByZXNzaW9uIHNhdmluZ3MgCj4gdGhhdCBpdCdz IGdvaW5nIHRvIGFsbG93IHRvIG1ha2UgdGhpbmdzIGZpdC4KClllcyBpdCB3b3JrcyBzdXJwcmlz aW5nbHkgd2VsbC4gQm90aCAuc28gZmlsZXMgYW5kIC5hcGsgZmlsZXMgY29tcHJlc3MgYnkgcm91 Z2hseSA0MCUuIEknbSBhbHNvIGEgYml0IHN1cnByaXNlZCBhdCB0aGUgLmFwayByZXN1bHRzLCBi dXQgaXQgd29ya3MgZ3JlYXQuCgo+wqAgQW5kIHNlY29uZGx5IChiKSBhZnRlciAKPiB5b3UgZGVj b21wcmVzcyB0aGUgc2hhcmVkIGxpYnJhcmllcywgaXMgdGhlcmUgZW5vdWdoIG1lbW9yeSB0aGF0 IHRoZSAKPiByZXN1bHRpbmcgc3lzdGVtIGZ1bmN0aW9ucyB3ZWxsLgoKWWVzLCBvbiBvdXIgcGFy dGljdWxhciBkZXZpY2UsIGl0IGFjdHVhbGx5IHBlcmZvcm1zIGF0IGxlYXN0IGFzIHdlbGwgYXMg YmVmb3JlLCBwb3NzaWJseSBiZXR0ZXIuIEkgaGF2ZW4ndCBkb25lIGFuIGV4dGVuc2l2ZSBzdXJ2 ZXkgb2YgbWVtb3J5IHVzYWdlIHRob3VnaC4KClRoZSBtYWpvcml0eSBvZiBjb21wcmVzc2lvbiBj b21lcyBmcm9tIC5zbyBhbmQgLmFwayBmaWxlcy4gU2hhcmVkIGxpYnMgYXJlIHR5cGljYWxseSBt bWFwJ2QgYW5kIG1vc3Qgb2YgdGhlIGNvbnRlbnRzIGFjY2Vzc2VkLiBhcGsgZmlsZXMgYXJlIG5v dCByZWZlcmVuY2VkIG11Y2ggYWZ0ZXIgaW5pdGlhbCBkZXhvcHQuCgo+IE9mdGVuIHRpbWVzIHRo ZXNlIG9sZGVyIEFuZHJvaWQgCj4gZGV2aWNlcyBkb24ndCBoYXZlIGEgaHVnZSBhbW91bnQgb2Yg bWVtb3J5LCBhbmQgc28gZWl0aGVyIHdpdGggb3IgCj4gd2l0aG91dCB0aGUgb3ZlcmhlYWQgb2Yg bmVlZGluZyB0byBkZWNvbXByZXNzIHRoZSBlbnRpcmUgZmlsZSAod2hpY2ggCj4gY2FuIGJlIHNv bHZlZCB3aXRoIGNodW5raW5nLCBhbHRob3VnaCB0aGlzIHRlbmRzIHRvIHJlZHVjZSB0aGUgCj4g Y29tcHJlc3Npb24gZWZmaWNpZW5jeSksIGlzIHRoZSBzeXN0ZW0gZ29pbmcgdG8gZnVuY3Rpb24g d2VsbCB1c2luZyAKPiA2NC1iaXQgYmluYXJpZXMgdGhhdCB0YWtlIHVwIGEgbG90IG1vcmUgcm9v bSB0aGFuIHRoZSBvbGRlciAzMi1iaXQgCj4gYmluYXJpZXM/IAoKT3VyIHRlc3QgZGV2aWNlIGlz IG5vdCBzbyBtdWNoIGFuIG9sZGVyIGRldmljZSwganVzdCBhIG1pZC1yYW5nZSBkZXZpY2UgKG1z bTg5MTYpLiBJdCBoYXMgbWVkaW9jcmUgZW1tYyBzcGVlZCBhbmQgZGVjZW50IENQVSAodGhvdWdo IHRoZXJtYWwgdGhyb3R0bGluZyBpcyBwcmV0dHkgYWdncmVzc2l2ZSkuCgo+Cj4gPiA+IFNvLCBJ IHdyb3RlIGEgdGhpbmcgY2FsbGVkICd6ZmlsZScgdGhhdCBob29rcyBpbnRvIHRoZSBWRlMgbGF5 ZXIgYW5kIAo+ID4gPiBpbnRlcmNlcHRzIGZpbGVfb3BlcmF0aW9ucyB0byBkbyBmaWxlIChkZSlj b21wcmVzc2lvbiBvbiB0aGUgZmx5LiBXaGVuIGEgCj4gPiA+IGZpbGUgaXMgb3BlbmVkLCBpdCBy ZWFkcyBhbmQgZGVjb21wcmVzc2VzIHRoZSBkYXRhIGludG8gbWVtb3J5LsKgIFRoZSBmaWxlIAo+ ID4gPiBtYXkgYmUgcmVhZCwgd3JpdHRlbiwgYW5kIG1tYXBlZCBpbiB0aGUgdXN1YWwgd2F5LsKg IElmIHRoZSBjb250ZW50cyBhcmUgCj4gPiA+IGNoYW5nZWQsIHRoZSBkYXRhIGlzIGNvbXByZXNz ZWQgYW5kIHdyaXR0ZW4gYmFjay4gCj4KPiBEbyB5b3UgcmVhbGx5IG5lZWQgdG8gYmUgYWJsZSB0 byByZXdyaXRlIHRoZSBmaWxlcz/CoCBMaWZlIGdldHMgbXVjaCAKPiBlYXNpZXIgaWYgeW91IGNh biBhc3N1bWUgdGhhdCB0aGUgY29tcHJlc3NlZCBmaWxlcyBhcmUgcmVhZC1vbmx5OyAKPiBlc3Bl Y2lhbGx5IG9uY2UgeW91IHN0YXJ0IHRyeWluZyB0byB1c2UgY2h1bmtpbmcsIGl0ICpkZWZpbml0 ZWx5KiAKPiBiZWNvbWVzIGVhc2llciBpZiB5b3UgZG9uJ3QgbmVlZCB0byBzdXBwb3J0IG1vZGlm eWluZyB0aGUgY29tcHJlc3NlZCAKPiBmaWxlcy7CoCBBbmQgaW4gdGhlIGNhc2Ugb2YgdGhlIHN5 c3RlbSBwYXJ0aXRpb24sIHRoaXMgbWlnaHQgYmUgYSBzYWZlIAo+IGFzc3VtcHRpb24seWVzPyAK CllvdSBhcmUgY29ycmVjdC4gV3JpdGluZyBpcyBub3QgcmVhbGx5IGEgcmVxdWlyZW1lbnQgZm9y IHVzLCBqdXN0IG5pY2UgdG8gaGF2ZS4=