From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id 771C829DF6 for ; Thu, 13 Aug 2015 11:40:26 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id 50D088F804B for ; Thu, 13 Aug 2015 09:40:26 -0700 (PDT) Received: from mx5-phx2.redhat.com (mx5-phx2.redhat.com [209.132.183.37]) by cuda.sgi.com with ESMTP id e86EBgUzoiuoB23o (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO) for ; Thu, 13 Aug 2015 09:40:23 -0700 (PDT) Date: Thu, 13 Aug 2015 12:40:22 -0400 (EDT) From: Zirong Lang Message-ID: <510394920.8151266.1439484022770.JavaMail.zimbra@redhat.com> In-Reply-To: <55CCC47A.5030706@sandeen.net> References: <1439478465-14072-1-git-send-email-zlang@redhat.com> <55CCC47A.5030706@sandeen.net> Subject: Re: [PATCH][RFC] xfs_copy: don't use DIRECT IO to copy 4k sector device MIME-Version: 1.0 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 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Eric Sandeen Cc: xfs@oss.sgi.com CgotLS0tLSDljp/lp4vpgq7ku7YgLS0tLS0KPiDlj5Hku7bkuro6ICJFcmljIFNhbmRlZW4iIDxz YW5kZWVuQHNhbmRlZW4ubmV0Pgo+IOaUtuS7tuS6ujogIlpvcnJvIExhbmciIDx6bGFuZ0ByZWRo YXQuY29tPiwgeGZzQG9zcy5zZ2kuY29tCj4g5Y+R6YCB5pe26Ze0OiDmmJ/mnJ/kupQsIDIwMTXl ubQgOCDmnIggMTTml6Ug5LiK5Y2IIDEyOjIzOjIyCj4g5Li76aKYOiBSZTogW1BBVENIXVtSRkNd IHhmc19jb3B5OiBkb24ndCB1c2UgRElSRUNUIElPIHRvIGNvcHkgNGsgc2VjdG9yIGRldmljZQo+ IAo+IE9uIDgvMTMvMTUgMTA6MDcgQU0sIFpvcnJvIExhbmcgd3JvdGU6Cj4gPiBXaGVuIEkgcnVu IHhmc3Rlc3RzIHhmcy8wMzIgaW4gcHBjNjRsZSwgSSBoaXQgYSBmYWlsdXJlOgo+ID4gCj4gPiAg ICAgIHhmc19jb3B5OiByZWFkIGZhaWxlZDogSW52YWxpZCBhcmd1bWVudAo+ID4gICAgICB4ZnNf Y29weTogc2l6ZSBjaGVjayBmYWlsZWQKPiA+ICAgICAgeGZzX2NvcHk6IC9kZXYvc2RhNSBmaWxl c3lzdGVtIGZhaWxlZCB0byBpbml0aWFsaXplCj4gPiAgICAgIHhmc19jb3B5OiBBYm9ydGluZy4K PiA+ICAgICAgQ29weSBmYWlsZWQgZm9yIFNlY3RvciBzaXplIDQwOTYgQmxvY2sgc2l6ZSA0MDk2 Cj4gPiAKPiA+IEkgdHJ5IHRvIHVzZSBnZGIgdHJhY2UgeGZzX2NvcHkuIEkgZmluZCBpdCB0cnkg dG8gb3BlbiB0aGUKPiA+IHNvdXJjZSBkZXZpY2Ugd2l0aCBESVJFQ1QgZmxhZywgdGhlbiByZWFk IHRoZSBkZXZpY2Ugd2l0aAo+ID4gKCgxPDxCQlNISUZUKSk9NTEyIGJ5dGVzIGxlbmd0aC4gSWYg dGhlIHNvdXJjZSBkZXZpY2UgaXMKPiA+IDRrIHNlY3RvciwgZGlyZWN0bHkgcmVhZCA1MTIgYnl0 ZXMgd2lsbCBiZSBmYWlsZWQuCj4gPiAKPiA+IHhmc19jb3B5ICctYicgb3B0aW9uIG9ubHkgd29y ayBmb3IgdGFyZ2V0IGZpbGUvZGV2aWNlLCB0bwo+ID4gc3VyZSBpdCB3aWxsIG9wZW4gdGhlIHRh cmdldCB3aXRob3V0IERJUkVDVCBmbGFnLiBCdXQgdXNlbGVzcwo+ID4gZm9yIHNvdXJjZSBkZXZp Y2Ugb3Blbi4KPiA+IAo+ID4gU28gSSBtYWtlIERJUkVDVCBmbGFnIG9ubHkgYmUgZW5hYmxlZCB3 aGVuIHNvdXJjZSBkZXZpY2UKPiA+IHNlY3RvciBzaXplIGVxdWFsIEJCU0laRS4KPiAKPiBXaGlj aCB2ZXJzaW9uIG9mIHhmc3Byb2dzIGRpZCB5b3UgdGVzdD8gIFRoaXMgaXMgcmVjZW50bHkgdXBz dHJlYW06CgpTb3JyeSBJIGRpZG4ndCBub3RpY2UgdGhhdCB5b3UgaGF2ZSBmaXggdGhpcyBwcm9i bGVtLiBJIHRlc3Qgb24gdGhlCm5ld2VzdCB2ZXJzaW9uIGZyb20gZ2l0Oi8vb3NzLnNnaS5jb20v eGZzL2NtZHMveGZzcHJvZ3MsIGl0IGhhdmVuJ3QKZml4IHRoaXMgcHJvYmxlbS4gSSB0ZXN0IHRo aXMgcGF0Y2ggb24gaXQgYXQgZmlyc3QuIFRoZW4gSSBmaW5kCnRoZXJlIGlzIGFub3RoZXIgdmVy c2lvbiBpbiBnaXQ6Ly9naXQua2VybmVsLm9yZy9wdWIvc2NtL2ZzL3hmcy94ZnNwcm9ncy1kZXYu Z2l0CgpJIGRvbid0IGtub3cgdGhleSBhcmUgdG9vIGRpZmZlcmVudCwgc28gSSBkaWRuJ3QgY2hl Y2sgaWYgdGhpcyB4ZnNwcm9ncy1kZXYgaGFzCiBmaXhlZCBpdCwgYW5kIGp1c3QgZGlkIHRoaXMg cGF0Y2ggb24gaXQgYW5kIHNlbmQgb3V0LgoKU29ycnkgZm9yIHRoaXMgbWlzdGFrZSwgYW5kIHlv dXIgcGF0Y2ggaXMgcmVhbGx5IGJldHRlcjopCgpUaGFua3MsClpvcnJvIExhbmcKCj4gCj4gY29t bWl0IGM2M2NlMTBhOTQ1MDAyMDM4MmJiYmUyYzQ4Nzg4OTYxYjE5ODMwZjQKPiBBdXRob3I6IEVy aWMgU2FuZGVlbiA8c2FuZGVlbkByZWRoYXQuY29tPgo+IERhdGU6ICAgRnJpIEp1bCAzMSAwOTow MzoxMSAyMDE1ICsxMDAwCj4gCj4gICAgIHhmc19jb3B5OiBmaXggY29weSBvZiBoYXJkIDRrIGRl dmljZXMKPiAgICAgCj4gICAgIElmIHdlIGhhdmUgYSBwdXJlIDRrIGRldmljZSB3aXRoIG5vIDUx MiBlbXVsYXRpb24sIHhmc19jb3B5Cj4gICAgIGZhaWxzIHN0cmFpZ2h0YXdheSBiZWNhdXNlIGl0 IHRyaWVzIHRvIGRvIGEgNTEyLWJ5dGUgZGlyZWN0Cj4gICAgIElPIHJlYWQgb2YgdGhlIHN1cGVy YmxvY2suCj4gICAgIAo+ICAgICBEbyBsaWtlIHdlIGRvIGluIHhmc19kYiwgYW5kIHJlYWQgaW4g dGhlIG1heCBwb3NzaWJsZSBzZWN0b3Igc2l6ZSwKPiAgICAgYmVjYXVzZSB3ZSBkb24ndCB5ZXQg a25vdyB3aGF0IHRoZSBmaWxlc3lzdGVtJ3Mgc2VjdG9yIHNpemUgaXMuCj4gICAgIAo+ICAgICBU aGlzIGZpeGVzIGEgZmFpbHVyZSBpbiB4ZnMvMDMyIG9uIGEgaGFyZCA0ayBkZXZpY2UuCj4gCj4g LUVyaWMKPiAKPiA+IFNpZ25lZC1vZmYtYnk6IFpvcnJvIExhbmcgPHpsYW5nQHJlZGhhdC5jb20+ Cj4gPiAtLS0KPiA+IAo+ID4gSGksCj4gPiAKPiA+IEknbSBub3Qgc28gZmFtaWxpYXIgZm9yIHhm c3Byb2dzLCBzbyBJJ20gbm90IHN1cmUgdGhpcydzIHRoZSBiZXN0Cj4gPiBpZGVhIHRvIGZpeCB0 aGlzIHByb2JsZW0uIFBsZWFzZSBoZWxwIHRvIGNoZWNrLCBhbmQgbWF5YmUgZ2l2ZSBtZQo+ID4g YmV0dGVyIHN1Z2dlc3Rpb25zLgo+ID4gCj4gPiBUaGFua3MgdmVyeSBtdWNoLAo+ID4gWm9ycm8g TGFuZwo+ID4gCj4gPiAgY29weS94ZnNfY29weS5jIHwgMyArKy0KPiA+ICAxIGZpbGUgY2hhbmdl ZCwgMiBpbnNlcnRpb25zKCspLCAxIGRlbGV0aW9uKC0pCj4gPiAKPiA+IGRpZmYgLS1naXQgYS9j b3B5L3hmc19jb3B5LmMgYi9jb3B5L3hmc19jb3B5LmMKPiA+IGluZGV4IGUxM2Y0NjguLjFjZDYy NTMgMTAwNjQ0Cj4gPiAtLS0gYS9jb3B5L3hmc19jb3B5LmMKPiA+ICsrKyBiL2NvcHkveGZzX2Nv cHkuYwo+ID4gQEAgLTY2Niw3ICs2NjYsNiBAQCBtYWluKGludCBhcmdjLCBjaGFyICoqYXJndikK PiA+ICAJLyogcHJlcGFyZSB0aGUgbGlieGZzX2luaXQgc3RydWN0dXJlICovCj4gPiAgCj4gPiAg CW1lbXNldCgmeGFyZ3MsIDAsIHNpemVvZih4YXJncykpOwo+ID4gLQl4YXJncy5pc2RpcmVjdCA9 IExJQlhGU19ESVJFQ1Q7Cj4gPiAgCXhhcmdzLmlzcmVhZG9ubHkgPSBMSUJYRlNfSVNSRUFET05M WTsKPiA+ICAKPiA+ICAJaWYgKHNvdXJjZV9pc19maWxlKSAgewo+ID4gQEAgLTY4OSw2ICs2ODgs OCBAQCBtYWluKGludCBhcmdjLCBjaGFyICoqYXJndikKPiA+ICAJCQkgICAgIDEgPDwgKFhGU19N QVhfU0VDVE9SU0laRV9MT0cgLSBCQlNISUZUKSwgMCwgTlVMTCk7Cj4gPiAgCXNiID0gJm1idWYu bV9zYjsKPiA+ICAJbGlieGZzX3NiX2Zyb21fZGlzayhzYiwgWEZTX0JVRl9UT19TQlAoc2JwKSk7 Cj4gPiArCWlmIChzYi0+c2Jfc2VjdHNpemUgPT0gQkJTSVpFKQo+ID4gKwkJeGFyZ3MuaXNkaXJl Y3QgPSBMSUJYRlNfRElSRUNUOwo+ID4gIAo+ID4gIAkvKiBEbyBpdCBhZ2Fpbiwgbm93IHdpdGgg cHJvcGVyIGxlbmd0aCBhbmQgdmVyaWZpZXIgKi8KPiA+ICAJbGlieGZzX3B1dGJ1ZihzYnApOwo+ ID4gCj4gCj4gCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f Xwp4ZnMgbWFpbGluZyBsaXN0Cnhmc0Bvc3Muc2dpLmNvbQpodHRwOi8vb3NzLnNnaS5jb20vbWFp bG1hbi9saXN0aW5mby94ZnMK