From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q5JEJcpn102707 for ; Tue, 19 Jun 2012 09:19:39 -0500 Received: from imap.thunk.org (li9-11.members.linode.com [67.18.176.11]) by cuda.sgi.com with ESMTP id h6C1E5pDscRJRllW (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO) for ; Tue, 19 Jun 2012 07:19:37 -0700 (PDT) Date: Tue, 19 Jun 2012 10:19:33 -0400 From: "Ted Ts'o" Subject: Re: Ext4 and xfs problems in dm-thin on allocation and discard Message-ID: <20120619141933.GC10637@thunk.org> References: <4FDF9EBE.2030809@shiftmail.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: =?utf-8?B?THVrw6HFoQ==?= Czerner Cc: linux-ext4@vger.kernel.org, device-mapper development , xfs@oss.sgi.com, Spelic T24gVHVlLCBKdW4gMTksIDIwMTIgYXQgMDQ6MDk6NDhQTSArMDIwMCwgTHVrw6HFoSBDemVybmVy IHdyb3RlOgo+IAo+IFdpdGggdGhpbiBwcm92aXNpb25pbmcgeW91J2xsIGdldCB0b3RhbGx5IGRp ZmZlcmVudCBmaWxlIHN5c3RlbQo+IGxheW91dCB0aGFuIG9uIGZ1bGx5IHByb3Zpc2lvbmVkIGRp c2sgYXMgeW91IHB1c2ggbW9yZSBhbmQgbW9yZQo+IHdyaXRlcyB0byB5b3VyIGRyaXZlLiBUaGlz IHVuZm9ydHVuYXRlbHkgaGFzIGdyZWF0IGltcGFjdCBvbgo+IHBlcmZvcm1hbmNlIHNpbmNlIGZp bGUgc3lzdGVtcyB1c3VhbGx5IGhhdmUgYSBsb3Qgb2Ygb3B0aW1pemF0aW9uIG9uCj4gd2hlcmUg dG8gcHV0IGRhdGEvbWV0YWRhdGEgb24gdGhlIGRyaXZlIGFuZCBob3cgdG8gcmVhZCB0aGVtLgo+ IEhvd2V2ZXIgaW4gY2FzZSBvZiB0aGlubHkgcHJvdmlzaW9uZWQgc3RvcmFnZSB0aG9zZSBvcHRp bWl6YXRpb24KPiB3b3VsZCBub3QgaGVscC4gQW5kIHllcywgeW91IGp1c3QgaGF2ZSB0byBleHBl Y3QgbG93ZXIgcGVyZm9ybWFuY2UKPiB3aXRoIGRtLXRoaW4gZnJvbSB0aGUgZmlsZSBzeXN0ZW0g b24gdG9wIG9mIGl0LiBJdCBpcyBub3QgYW5kIGl0Cj4gd2lsbCBuZXZlciBiZSBpZGVhbCBzb2x1 dGlvbiBmb3Igd29ya2xvYWRzIHdoZXJlIHlvdSBleHBlY3QgdGhlIGJlc3QKPiBwZXJmb3JtYW5j ZS4KCk9uZSBvZiB0aGUgdGhpbmdzIHdoaWNoIHdvdWxkIGJlIG5pY2UgdG8gYmUgYWJsZSB0byBl YXNpbHkgc2V0IHVwIGlzIGEKY29uZmlndXJhdGlvbiB3aGVyZSB3ZSBnZXQgdGhlIGJlbmVmaXRz IG9mIHRoaW4gcHJvdmlzaW9uaW5nIHdpdGgKcmVzcGVjdCB0byBzbmFwc2hvc3QsIGJ1dCB3aGVy ZSB0aGUgdW5kZXJseWluZyBibG9jayBkZXZpY2UgdXNlZCBieQp0aGUgZmlsZSBzeXN0ZW0gaXMg Y29udGlndW91cy4gIFRoYXQgaXMsIGl0IHdvdWxkIGJlIHJlYWxseSB1c2VmdWwgdG8KKm5vdCog dXNlIHRoaW4gcHJvdmlzaW9uaW5nIGZvciB0aGUgdW5kZXJseWluZyBmaWxlIHN5c3RlbSwgYnV0 IHRvIHVzZQp0aGluIHByb3Zpc2lvbmVkIHNuYXBzaG90cy4gIFRoYXQgd2F5IHdlIG9ubHkgcGF5 IHRoZSB0aGlucApwZXJmb3JtYW5jZSBwZW5hbHR5IGZvciB0aGUgc25hcHNob3RzLCBhbmQgbm90 IGZvciBub3JtYWwgZmlsZSBzeXN0ZW0Kb3BlcmF0aW9ucy4gIFRoaXMgaXMgc29tZXRoaW5nIHRo YXQgd291bGQgYmUgdmVyeSB1c2VmdWwgYm90aCBmb3IgZXh0NAphbmQgeGZzLgoKSSB0YWxrZWQg dG8gQWxhc2RhaXIgYWJvdXQgdGhpcyBhIGZldyBtb250aHMgYWdvIGF0IHRoZSBDb2xsYWIgU3Vt bWl0LAphbmQgSSB0aGluayBpdCdzIGRvYWJsZSB0b2RheSwgYnV0IGl0IHdhcyBzb21ld2hhdCBj b21wbGljYWVkIHRvIHNldAp1cC4gIEkgZG9uJ3QgcmVjYWxsIHRoZSBkZXRhaWxzIG5vdywgYnV0 IHBlcmhhcHMgc29tZW9uZSB3aG8ncyBtb3JlCmZhbWlsaWFyIGRldmljZSBtYXBwZXIgY291bGQg b3V0bGluZSB0aGUgZGV0YWlscywgYW5kIHBlcmhhcHMgd2UgY2FuCmVpdGhlciBzaW1wbGlmeSBp dCBvciBhYnN0cmFjdCBpdCBhd2F5IGluIGEgY29udmVuaWVudCBmcm9udC1lbmQKc2NyaXB0PwoK CQkJCQkJLSBUZWQKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fCnhmcyBtYWlsaW5nIGxpc3QKeGZzQG9zcy5zZ2kuY29tCmh0dHA6Ly9vc3Muc2dpLmNvbS9t YWlsbWFuL2xpc3RpbmZvL3hmcwo=