From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chao Yu Subject: Re: [PATCH V2] f2fs: check all ones or zeros bitmap with bitops for better mount performance Date: Fri, 25 Oct 2013 09:34:46 +0800 Message-ID: <000001ced122$86c53f10$944fbd30$@samsung.com> References: <000401ced092$28087a90$78196fb0$@samsung.com> <5268F075.3000206@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Cc: linux-fsdevel@vger.kernel.org, =?utf-8?B?J+iwreWnnSc=?= , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net To: 'Gu Zheng' Return-path: In-reply-to: <5268F075.3000206@cn.fujitsu.com> Content-language: zh-cn List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net List-Id: linux-fsdevel.vger.kernel.org SGkgR3UsCgo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tCj4gRnJvbTogR3UgWmhlbmcgW21h aWx0bzpndXouZm5zdEBjbi5mdWppdHN1LmNvbV0KPiBTZW50OiBUaHVyc2RheSwgT2N0b2JlciAy NCwgMjAxMyA2OjA0IFBNCj4gVG86IENoYW8gWXUKPiBDYzogamFlZ2V1ay5raW1Ac2Ftc3VuZy5j b207IGxpbnV4LWZzZGV2ZWxAdmdlci5rZXJuZWwub3JnOwo+IGxpbnV4LWtlcm5lbEB2Z2VyLmtl cm5lbC5vcmc7IGxpbnV4LWYyZnMtZGV2ZWxAbGlzdHMuc291cmNlZm9yZ2UubmV0OyAn6LCt5aed Jwo+IFN1YmplY3Q6IFJlOiBbZjJmcy1kZXZdIFtQQVRDSCBWMl0gZjJmczogY2hlY2sgYWxsIG9u ZXMgb3IgemVyb3MgYml0bWFwIHdpdGgKPiBiaXRvcHMgZm9yIGJldHRlciBtb3VudCBwZXJmb3Jt YW5jZQo+IAo+IEhpIFl1LAo+IE9uIDEwLzI0LzIwMTMgMDQ6MjEgUE0sIENoYW8gWXUgd3JvdGU6 Cj4gCj4gPiBQcmV2aW91c2x5LCBjaGVja19ibG9ja19jb3VudCBjaGVjayB2YWxpZF9tYXAgd2l0 aCBiaXQgZGF0YSB0eXBlIGluIGNvbW1vbgo+IHNjZW5hcmlvIHRoYXQgc2l0IGhhcyBhbGwgb25l cyBvciB6ZXJvcyBiaXRtYXAsIGl0IG1ha2VzIGxvdyBtb3VudAo+IHBlcmZvcm1hbmNlLgo+ID4g U28gbGV0J3MgY2hlY2sgdGhlIHNwZWNpYWwgYml0bWFwIHdpdGggaW50ZWdlciBkYXRhIHR5cGUg aW5zdGVhZCBvZiB0aGUgYml0IG9uZS4KPiA+Cj4gPiB2MjoKPiA+ICAgICB1c2UgZmluZF9uZXh0 X2JpdF9sZS9maW5kX25leHRfemVyb19iaXRfbGUgZm9yIGJldHRlciBwZXJmb3JtYW5jZSBhbmQK PiByZWFkYWJsZSBhcyBKYWVnZXVrIHN1Z2dlc3RlZC4KPiAKPiBJZiBzbywgaG93IGFib3V0IHVz aW5nIGZpbmRfZmlyc3Rfe3plcm9ffWJpdF9sZSBpbnN0ZWFkPyBJdCdzIG1vcmUgbmVhdC4KSXQg c2VlbXMgbW9yZSBuZWF0LiBJIHdpbGwgdGFrZSBpdCwgdGhhbmtzLgoKPiAKPiBSZWdhcmRzLAo+ IEd1Cj4gCj4gPgo+ID4gU3VnZ2VzdGVkLWJ5OiBKYWVnZXVrIEtpbSA8amFlZ2V1ay5raW1Ac2Ft c3VuZy5jb20+Cj4gPiBTaWduZWQtb2ZmLWJ5OiBUYW4gU2h1IDxzaHUudGFuQHNhbXN1bmcuY29t Pgo+ID4gU2lnbmVkLW9mZi1ieTogWXUgQ2hhbyA8Y2hhbzIueXVAc2Ftc3VuZy5jb20+Cj4gPiAt LS0KPiA+ICBmcy9mMmZzL3NlZ21lbnQuaCB8ICAgMTcgKysrKysrKysrKysrKysrKysKPiA+ICAx IGZpbGUgY2hhbmdlZCwgMTcgaW5zZXJ0aW9ucygrKQo+ID4KPiA+IGRpZmYgLS1naXQgYS9mcy9m MmZzL3NlZ21lbnQuaCBiL2ZzL2YyZnMvc2VnbWVudC5oIGluZGV4Cj4gPiA3Zjk0ZDc4Li5kMjVi NmFmIDEwMDY0NAo+ID4gLS0tIGEvZnMvZjJmcy9zZWdtZW50LmgKPiA+ICsrKyBiL2ZzL2YyZnMv c2VnbWVudC5oCj4gPiBAQCAtNTUyLDYgKzU1MiwyMyBAQCBzdGF0aWMgaW5saW5lIHZvaWQgY2hl Y2tfYmxvY2tfY291bnQoc3RydWN0Cj4gZjJmc19zYl9pbmZvICpzYmksCj4gPiAgCS8qIGNoZWNr IGJvdW5kYXJ5IG9mIGEgZ2l2ZW4gc2VnbWVudCBudW1iZXIgKi8KPiA+ICAJQlVHX09OKHNlZ25v ID4gZW5kX3NlZ25vKTsKPiA+Cj4gPiArCS8qIGNoZWNrIGFsbCBvbmVzIG9yIHplcm9zIHZhbGlk X21hcCAqLwo+ID4gKwlpZiAoR0VUX1NJVF9WQkxPQ0tTKHJhd19zaXQpID09IDApIHsKPiA+ICsJ CWludCBwb3MgPSBmaW5kX25leHRfYml0X2xlKCZyYXdfc2l0LT52YWxpZF9tYXAsCj4gPiArCQkJ CQlzYmktPmJsb2Nrc19wZXJfc2VnLAo+ID4gKwkJCQkJMCk7Cj4gPiArCQlpZiAocG9zICE9IHNi aS0+YmxvY2tzX3Blcl9zZWcpCj4gPiArCQkJQlVHKCk7Cj4gPiArCQlyZXR1cm47Cj4gPiArCX0g ZWxzZSBpZiAoR0VUX1NJVF9WQkxPQ0tTKHJhd19zaXQpID09IHNiaS0+YmxvY2tzX3Blcl9zZWcp IHsKPiA+ICsJCWludCBwb3MgPSBmaW5kX25leHRfemVyb19iaXRfbGUoJnJhd19zaXQtPnZhbGlk X21hcCwKPiA+ICsJCQkJCXNiaS0+YmxvY2tzX3Blcl9zZWcsCj4gPiArCQkJCQkwKTsKPiA+ICsJ CWlmIChwb3MgIT0gc2JpLT5ibG9ja3NfcGVyX3NlZykKPiA+ICsJCQlCVUcoKTsKPiA+ICsJCXJl dHVybjsKPiA+ICsJfQo+ID4gKwo+ID4gIAkvKiBjaGVjayBiaXRtYXAgd2l0aCB2YWxpZCBibG9j ayBjb3VudCAqLwo+ID4gIAlmb3IgKGkgPSAwOyBpIDwgc2JpLT5ibG9ja3NfcGVyX3NlZzsgaSsr KQo+ID4gIAkJaWYgKGYyZnNfdGVzdF9iaXQoaSwgcmF3X3NpdC0+dmFsaWRfbWFwKSkKCgoKLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tCk9jdG9iZXIgV2ViaW5hcnM6IENvZGUgZm9yIFBlcmZvcm1hbmNl CkZyZWUgSW50ZWwgd2ViaW5hcnMgY2FuIGhlbHAgeW91IGFjY2VsZXJhdGUgYXBwbGljYXRpb24g cGVyZm9ybWFuY2UuCkV4cGxvcmUgdGlwcyBmb3IgTVBJLCBPcGVuTVAsIGFkdmFuY2VkIHByb2Zp bGluZywgYW5kIG1vcmUuIEdldCB0aGUgbW9zdCBmcm9tIAp0aGUgbGF0ZXN0IEludGVsIHByb2Nl c3NvcnMgYW5kIGNvcHJvY2Vzc29ycy4gU2VlIGFic3RyYWN0cyBhbmQgcmVnaXN0ZXIgPgpodHRw Oi8vcHViYWRzLmcuZG91YmxlY2xpY2submV0L2dhbXBhZC9jbGs/aWQ9NjAxMzU5OTEmaXU9LzQx NDAvb3N0Zy5jbGt0cmsKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18KTGludXgtZjJmcy1kZXZlbCBtYWlsaW5nIGxpc3QKTGludXgtZjJmcy1kZXZlbEBsaXN0 cy5zb3VyY2Vmb3JnZS5uZXQKaHR0cHM6Ly9saXN0cy5zb3VyY2Vmb3JnZS5uZXQvbGlzdHMvbGlz dGluZm8vbGludXgtZjJmcy1kZXZlbAo=