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Fri, 29 Jan 2021 07:45:52 +0000 Received: from szxga08-in.huawei.com ([45.249.212.255]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l5OTT-0006F0-Ex for linux-nvme@lists.infradead.org; Fri, 29 Jan 2021 07:45:49 +0000 Received: from DGGEMM401-HUB.china.huawei.com (unknown [172.30.72.56]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4DRq8X58mtz13bbl; Fri, 29 Jan 2021 15:43:40 +0800 (CST) Received: from dggema772-chm.china.huawei.com (10.1.198.214) by DGGEMM401-HUB.china.huawei.com (10.3.20.209) with Microsoft SMTP Server (TLS) id 14.3.498.0; Fri, 29 Jan 2021 15:45:40 +0800 Received: from [10.169.42.93] (10.169.42.93) by dggema772-chm.china.huawei.com (10.1.198.214) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2106.2; Fri, 29 Jan 2021 15:45:40 +0800 Subject: Re: [PATCH v2] nvme-multipath: Early exit if no path is available To: Hannes Reinecke , Sagi Grimberg , "Daniel Wagner" References: <20210127103033.15318-1-dwagner@suse.de> <20210128075837.u5u56t23fq5gu6ou@beryllium.lan> <69575290-200e-b4a1-4269-c71e4c2cc37b@huawei.com> <20210128094004.erwnszjqcxlsi2kd@beryllium.lan> <675d3cf7-1ae8-adc5-b6d0-359fe10f6b23@grimberg.me> <59cd053e-46cb-0235-141f-4ce919c93f48@huawei.com> <65392653-6b03-9195-f686-5fe4b3290bd2@suse.de> From: Chao Leng Message-ID: <81b22bbf-4dd3-6161-e63a-9699690a4e4f@huawei.com> Date: Fri, 29 Jan 2021 15:45:39 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <65392653-6b03-9195-f686-5fe4b3290bd2@suse.de> Content-Language: en-US X-Originating-IP: [10.169.42.93] X-ClientProxiedBy: dggeme705-chm.china.huawei.com (10.1.199.101) To dggema772-chm.china.huawei.com (10.1.198.214) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210129_024549_035376_98F340B7 X-CRM114-Status: GOOD ( 14.33 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jens Axboe , Keith Busch , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Christoph Hellwig Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org CgpPbiAyMDIxLzEvMjkgMTU6MDYsIEhhbm5lcyBSZWluZWNrZSB3cm90ZToKPiBPbiAxLzI5LzIx IDQ6MDcgQU0sIENoYW8gTGVuZyB3cm90ZToKPj4KPj4KPj4gT24gMjAyMS8xLzI5IDk6NDIsIFNh Z2kgR3JpbWJlcmcgd3JvdGU6Cj4+Pgo+Pj4+PiBZb3UgY2FuJ3Qgc2VlIGV4YWN0bHkgd2hlcmUg aXQgZGllcyBidXQgSSBmb2xsb3dlZCB0aGUgYXNzZW1ibHkgdG8KPj4+Pj4gbnZtZV9yb3VuZF9y b2Jpbl9wYXRoKCkuIE1heWJlIGl0J3Mgbm90IHRoZSBpbml0aWFsIG52bWVfbmV4dF9ucyhoZWFk LAo+Pj4+PiBvbGQpIHdoaWNoIHJldHVybnMgTlVMTCBidXQgbnZtZV9uZXh0X25zKCkgaXMgcmV0 dXJuaW5nIE5VTEwgZXZlbnR1YWxseQo+Pj4+PiAobGlzdF9uZXh0X29yX251bGxfcmN1KCkpLgo+ Pj4+IFNvIHRoZXJlIGlzIG90aGVyIGJ1ZyBjYXVzZSBudm1lX25leHRfbnMgYWJvcm1hbC4KPj4+ PiBJIHJldmlldyB0aGUgY29kZSBhYm91dCBoZWFkLT5saXN0IGFuZCBoZWFkLT5jdXJyZW50X3Bh dGgsIEkgZmluZCAyIGJ1Z3MKPj4+PiBtYXkgY2F1c2UgdGhlIGJ1ZzoKPj4+PiBGaXJzdCwgSSBh bHJlYWR5IHNlbmQgdGhlIHBhdGNoLiBzZWU6Cj4+Pj4gaHR0cHM6Ly9sb3JlLmtlcm5lbC5vcmcv bGludXgtbnZtZS8yMDIxMDEyODAzMzM1MS4yMjExNi0xLWxlbmdjaGFvQGh1YXdlaS5jb20vCj4+ Pj4gU2Vjb25kLCBpbiBudm1lX25zX3JlbW92ZSwgbGlzdF9kZWxfcmN1IGlzIGJlZm9yZQo+Pj4+ IG52bWVfbXBhdGhfY2xlYXJfY3VycmVudF9wYXRoLiBUaGlzIG1heSBjYXVzZSAib2xkIiBpcyBk ZWxldGVkIGZyb20gdGhlCj4+Pj4gImhlYWQiLCBidXQgc3RpbGwgdXNlICJvbGQiLiBJJ20gbm90 IHN1cmUgdGhlcmUncyBhbnkgb3RoZXIKPj4+PiBjb25zaWRlcmF0aW9uIGhlcmUsIEkgd2lsbCBj aGVjayBpdCBhbmQgdHJ5IHRvIGZpeCBpdC4KPj4+Cj4+PiBUaGUgcmVhc29uIHdoeSB3ZSBmaXJz dCByZW1vdmUgZnJvbSBoZWFkLT5saXN0IGFuZCBvbmx5IHRoZW4gY2xlYXIKPj4+IGN1cnJlbnRf cGF0aCBpcyBiZWNhdXNlIHRoZSBvdGhlciB3YXkgYXJvdW5kIHRoZXJlIGlzIG5vIHdheQo+Pj4g dG8gZ3VhcmFudGVlIHRoYXQgdGhhdCB0aGUgbnMgd29uJ3QgYmUgYXNzaWduZWQgYXMgY3VycmVu dF9wYXRoCj4+PiBhZ2FpbiAoYmVjYXVzZSBpdCBpcyBpbiBoZWFkLT5saXN0KS4KPj4gb2ssIEkg c2VlLgo+Pj4KPj4+IG52bWVfbnNfcmVtb3ZlIGZlbmNlcyBjb250aW51ZSBvZiBkZWxldGlvbiBv ZiB0aGUgbnMgYnkgc3luY2hyb25pemluZwo+Pj4gdGhlIHNyY3Ugc3VjaCB0aGF0IGZvciBzdXJl IHRoZSBjdXJyZW50X3BhdGggY2xlYXJhbmNlIGlzIHZpc2libGUuCj4+IFRoZSBsaXN0IHdpbGwg YmUgbGlrZSB0aGlzOgo+PiBoZWFkLT5uZXh0ID0gbnMxOwo+PiBuczEtPm5leHQgPSBoZWFkOwo+ PiBvbGQtPm5leHQgPSBuczE7Cj4gCj4gV2hlcmUgZG9lcyAnb2xkJyBwb2ludGluZyB0bz8KPiAK Pj4gVGhpcyBtYXkgY2F1c2UgaW5maW5pdGUgbG9vcCBpbiBudm1lX3JvdW5kX3JvYmluX3BhdGgu Cj4+IGZvciAobnMgPSBudm1lX25leHRfbnMoaGVhZCwgb2xkKTsKPj4gwqDCoMKgwqDCoG5zICE9 IG9sZDsKPj4gwqDCoMKgwqDCoG5zID0gbnZtZV9uZXh0X25zKGhlYWQsIG5zKSkKPj4gVGhlIG5z IHdpbGwgYWx3YXlzIGJlIG5zMSwgYW5kIHRoZW4gaW5maW5pdGUgbG9vcC4KPiAKPiBOby4gbnZt ZV9uZXh0X25zKCkgd2lsbCByZXR1cm4gTlVMTC4KSWYgdGhlcmUgaXMganVzdCBvbmUgcGF0aCh0 aGUgIm9sZCIpIGFuZCB0aGUgIm9sZCIgaXMgZGVsZXRlZCwKbnZtZV9uZXh0X25zKCkgd2lsbCBy ZXR1cm4gTlVMTC4KVGhlIGxpc3QgbGlrZSB0aGlzOgpoZWFkLT5uZXh0ID0gaGVhZDsKb2xkLT5u ZXh0ID0gaGVhZDsKSWYgdGhlcmUgaXMgdHdvIG9yIG1vcmUgcGF0aCBhbmQgdGhlICJvbGQiIGlz IGRlbGV0ZWQsCiJmb3IiIHdpbGwgYmUgaW5maW5pdGUgbG9vcC4gYmVjYXVzZSBudm1lX25leHRf bnMoKSB3aWxsIHJldHVybgp0aGUgcGF0aCB3aGljaCBpbiB0aGUgbGlzdCBleGNlcHQgdGhlICJv bGQiLCBjaGVjayBjb25kaXRpb24gd2lsbApiZSB0cnVlIGZvciBldmVyLgpGb3IgZXhhbXBsZSwg dGhlcmUgaXMgdHdvIHBhdGg6IG9uZSBpcyB0aGUgIm9sZCIsIGFub3RoZXIgaXMgIm5zMSIuClRo ZSBsaXN0IGxpa2UgdGhpczoKaGVhZC0+bmV4dCA9IG5zMTsKbnMxLT5uZXh0ID0gaGVhZDsKb2xk LT5uZXh0ID0gbnMxOwpudm1lX25leHRfbnMoaGVhZCwgb2xkKSB3aWxsIHJldHVybiBuczE7ClRo ZW4gbnZtZV9uZXh0X25zKGhlYWQsIG5zMSkgd2lsbCByZXR1cm4gbnMxOwpBbmQgdGhlbiBpbmZp bml0ZSBsb29wLgo+IAo+IENoZWVycywKPiAKPiBIYW5uZXMKCl9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fCkxpbnV4LW52bWUgbWFpbGluZyBsaXN0CkxpbnV4 LW52bWVAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2xpbnV4LW52bWUK