From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: block layer API for file system creation - when to use multidisk mode Date: Sat, 1 Dec 2018 15:52:31 -0500 Message-ID: <80505ddf-8c6f-50d7-1e6d-2e50e7349c6f@gmail.com> References: <67627995-714c-5c38-a796-32b503de7d13@sandeen.net> <20181005232710.GH12041@dastard> <20181006232037.GB18095@dastard> <36bc3f17-e7d1-ce8b-2088-36ff5d7b1e8b@sandeen.net> <0290ec9f-ab2b-7c1b-faaf-409d72f99e5f@gmail.com> <20181129214851.GU6311@dastard> <39031e68-3936-b5e1-bcb6-6fdecc5988c1@gmail.com> <20181130022510.GW6311@dastard> <3da04164-a89f-f4c0-1529-eab12b3226e1@gmail.com> <20181201043509.GZ6311@dastard> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20181201043509.GZ6311@dastard> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Dave Chinner Cc: Jens Axboe , Eric Sandeen , "linux-scsi@vger.kernel.org" , Mike Snitzer , Eric Sandeen , xfs , IDE/ATA development list , device-mapper development , linux-block@vger.kernel.org, Mark Nelson , Ilya Dryomov List-Id: linux-ide@vger.kernel.org T24gMTEvMzAvMTggMTE6MzUgUE0sIERhdmUgQ2hpbm5lciB3cm90ZToKPiBPbiBGcmksIE5vdiAz MCwgMjAxOCBhdCAwMTowMDo1MlBNIC0wNTAwLCBSaWMgV2hlZWxlciB3cm90ZToKPj4gT24gMTEv MzAvMTggNzo1NSBBTSwgRGF2ZSBDaGlubmVyIHdyb3RlOgo+Pj4gT24gVGh1LCBOb3YgMjksIDIw MTggYXQgMDY6NTM6MTRQTSAtMDUwMCwgUmljIFdoZWVsZXIgd3JvdGU6Cj4+Pj4gT3RoZXIgZmls ZSBzeXN0ZW1zIGFsc28gbmVlZCB0bwo+Pj4+IGFjY29tbW9kYXRlL3Byb2JlIGJlaGluZCB0aGUg ZmljdGl0aW91cyB2aXNpYmxlIHN0b3JhZ2UgZGV2aWNlCj4+Pj4gbGF5ZXIuLi4gU3BlY2lmaWNh bGx5LCBpcyB0aGVyZSBzb21ldGhpbmcgd2UgY2FuIGFkZCBwZXIgYmxvY2sKPj4+PiBkZXZpY2Ug dG8gaGVscCBoZXJlPyBOdW1iZXIgb2YgaW5kZXBlbmRlbnQgZGV2aWNlcwo+Pj4gVGhhdCdzIGhv dyBta2ZzLnhmcyB1c2VkIHRvIGRvIHN0cmlwZSB1bml0L3N0cmlwZSB3aWR0aCBjYWxjdWxhdGlv bnMKPj4+IGF1dG9tYXRpY2FsbHkgb24gTUQgZGV2aWNlcyBiYWNrIGluIHRoZSAyMDAwcy4gV2Ug Z290IHJpZCBvZiB0aGF0Cj4+PiBmb3IgbW9yZSBnZW5lcmFseSBhcHBsaWNhYmxlIGNvbmZpZ3Vy YXRpb24gaW5mb3JtYXRpb24gc3VjaCBhcwo+Pj4gbWluaW11bS9vcHRpbWFsIElPIHNpemVzIHNv IHdlIGNvdWxkIGV4cG9zZSBlcXVpdmFsZW50IGFsaWdubWVudAo+Pj4gaW5mb3JtYXRpb24gZnJv bSBsb3RzIG9mIGRpZmZlcmVudCB0eXBlcyBvZiBzdG9yYWdlIGRldmljZS4uLi4KPj4+Cj4+Pj4g b3IgYSBtYXAgb2YKPj4+PiB0aG9zZSByZWdpb25zPwo+Pj4gTm90IHN1cmUgd2hhdCB0aGlzIG1l YW5zIG9yIGhvdyB3ZSdkIHVzZSBpdC4KPj4+IERhdmUuCj4+IFdoYXQgSSB3YXMgdGhpbmtpbmcg b2Ygd2FzIGEgd2F5IG9mIGdpdmluZyB1cCBhIGdvb2Qgb3V0bGluZSBvZiBob3cKPj4gbWFueSBp bmRlcGVuZGVudCByZWdpb25zIHRoYXQgYXJlIGJlaGluZCBvbmUgInZpcnR1YWwiIGJsb2NrIGRl dmljZQo+PiBsaWtlIGEgY2VwaCByYmQgb3IgZGV2aWNlIG1hcHBlciBkZXZpY2UuIE15IGFzc3Vt cHRpb24gaXMgdGhhdCB3ZQo+PiBhcmUgdHJ5aW5nIHRvIGxheSBkb3duIChhdCBsZWFzdCBvbmUp IGFsbG9jYXRpb24gZ3JvdXAgcGVyIHJlZ2lvbi4KPj4KPj4gV2hhdCB3ZSBuZWVkIHRvIG9wdGlt aXplIGZvciBpbmNsdWRlczoKPj4KPj4gIMKgwqDCoCAqIGhvdyBtYW55IGluZGVwZW5kZW50IHJl Z2lvbnMgYXJlIHRoZXJlPwo+Pgo+PiAgwqDCoMKgICogd2hhdCBhcmUgdGhlIGJvdW5kYXJpZXMg b2YgdGhvc2UgcmVnaW9ucz8KPj4KPj4gIMKgwqDCoCAqIG9wdGltYWwgSU8gc2l6ZS9hbGlnbm1l bnQvZXRjCj4+Cj4+IFNvbWUgb2YgdGhhdCB3ZSBoYXZlLCBidXQgdGhlIGN1cnJlbnQgYXNzdW1w dGlvbnMgZG9uJ3Qgd29yayB3ZWxsCj4+IGZvciBhbGwgZGV2aWNlIHR5cGVzLgo+IE9oLCBzbyBl c3NlbnRpYWwgImluZGVwZW5kZW50IHJlZ2lvbnMiIG9mIHRoZSBzdG9yYWdlIGRldmljZS4gSQo+ IHdyb3RlIHRoaXMgaW4gMjAwODoKPgo+IGh0dHA6Ly94ZnMub3JnL2luZGV4LnBocC9SZWxpYWJs ZV9EZXRlY3Rpb25fYW5kX1JlcGFpcl9vZl9NZXRhZGF0YV9Db3JydXB0aW9uI0ZhaWx1cmVfRG9t YWlucwo+Cj4gVGhpcyB3YXMgZGVyaXZlZCBmcm9tIHRoZSBpZGVhcyBpbiBwcm90b3R5cGUgY29k ZSBJIHdyb3RlIGluIH4yMDA3Cj4gdG8gdHJ5IHRvIG9wdGltaXNlIGZpbGUgbGF5b3V0IGFuZCBs b2FkIGRpc3RyaWJ1dGlvbiBhY3Jvc3MgbGluZWFyCj4gY29uY2F0cyBvZiBtdWx0aS1UQiBSQUlE NiBsdW5zLiBTb21lIG9mIHRoYXQgd29yayB3YXMgcHVibGlzaGVkCj4gbG9uZyBhZnRlciBJIGxl ZnQgU0dJOgo+Cj4gaHR0cHM6Ly9tYXJjLmluZm8vP2w9bGludXgteGZzJm09MTIzNDQxMTkxMjIy NzE0Jnc9Mgo+Cj4gRXNzZW50aWFsbHksIGluZGVwZW5kZW50IHJlZ2lvbnMgLSBjYWxsZWQgIkxv Z2ljYWwKPiBFeHRlbnNpb24gR3JvdXBzIiwgb3IgImxlZ3MiIG9mIHRoZSBmaWxlc3lzdGVtIC0g YW5kIHdvdWxkCj4gZXNzZW50aWFsbHkgYmUgYW4gYWdncmVnYXRpb24gb2YgQUdzIGluIHRoYXQg cmVnaW9uLiBUaGUKPiBjb25jZXB0IHdhcyB0aGF0IHdlJ2QgbW92ZSB0aGUgZ2VvbWV0cnkgaW5m b3JtYXRpb24gZnJvbSB0aGUKPiBzdXBlcmJsb2NrIGludG8gdGhlIGxlZ3MsIGFuZCBzbyB3ZSBj b3VsZCBoYXZlIGRpZmZlcmVudCBBRwo+IGdlb2VtZXRyeSBvcHRpbWllcyBmb3IgZWFjaCBpbmRl cGVuZGVudCBsZWcgb2YgdGhlIGZpbGVzeXN0ZW0uCj4KPiBlZyB0aGUgU1NEIHJlZ2lvbiBjb3Vs ZCBoYXZlIG51bWVyb3VzIHNtYWxsIEFHcywgdGhlIGxhcmdlLAo+IGNvbnRpZ3VvdXMgUkFJRDYg cGFydCBjb3VsZCBoYXZlIG1heGltYWxseSBzaXplIEFHcyBvciBldmVuIG1ha2UgdXNlCj4gb2Yg dGhlIFJUIGFsbG9jYXRvciBmb3IgZnJlZSBzcGFjZSBtYW5hZ2VtZW50IGluc3RlYWQgb2YgdGhl Cj4gQUcvYnRyZWUgYWxsb2NhdG9yLiBCYXNpY2FsbHkgaXQgd2FzIHNlZW4gYXMgYSBtZWNoYW5p c20gZm9yIGdldHRpbmcKPiByaWQgb2YgbmVlZGluZyB0byBzcGVjaWZ5IGJsb2NrIGRldmljZXMg YXMgY29tbWFuZCBsaW5lIG9yIG1vdW50Cj4gb3B0aW9ucy4KPgo+IEZ1bmRhbWVudGFsbHksIHRo b3VnaCwgaXQgd2FzIGJhc2VkIG9uIHRoZSBjb25jZXB0IHRoYXQgTGludXggd291bGQKPiBldmVu dHVhbGx5IGdyb3cgYW4gaW50ZXJmYWNlIGZvciB0aGUgYmxvY2sgZGV2aWNlL3ZvbHVtZSBtYW5h Z2VyIHRvCj4gdGVsbCB0aGUgZmlsZXN5c3RlbSB3aGVyZSB0aGUgaW5kZXBlbmRlbnQgcmVnaW9u cyBpbiB0aGUgZGV2aWNlCj4gd2VyZSgqKSwgYnV0IHRoYXQncyBub3Qgc29tZXRoaW5nIHRoYXQg aGFzIGV2ZXIgYXBwZWFyZWQuIElmIHlvdSBjYW4KPiBwcm92aWRlIGFuIGluZGVwZWRlbnQgcmVn aW9uIG1hcCBpbiBhbiBlYXN5IHRvIGRpZ2VzdCBmb3JtYXQgKGUuZy4gYQo+IHNldCBvZiB7b2Zm c2V0LCBsZW4sIGdlb21ldHJ5fSB0dXBsZXMpLCB0aGVuIHdlIGNhbiBvYnZpb3VzbHkgbWFrZQo+ IHVzZSBvZiBpdCBpbiBYRlMuLi4uCj4KPiBDaGVlcnMsCj4KPiBEYXZlLgo+Cj4gKCopIEJhc2lj YWxseSBwcm92aWRlIGEgbGludXggdmVyc2lvbiBvZiB0aGUgZnVuY3Rpb25hbGl0eSBJcml4Cj4g dm9sdW1lIG1hbmFnZXJzIGhhZCBwcm92aWRlZCBmaWxlc3lzdGVtcyBzaW5jZSB0aGUgbGF0ZSA4 MHMuLi4uCj4KSGkgRGF2ZSwKClRoaXMgaXMgZXhhY3RseSB0aGUga2luZCBvZiB0aGluZyBJIHRo aW5rIHdvdWxkIGJlIHVzZWZ1bC7CoCBXZSBtaWdodCB3YW50IHRvIApoYXZlIGEgZGlzdGluY3Qg dmFsdWUgKGxpa2UgdGhlIHJvdGF0aW9uYWwpIHRoYXQgaW5kaWNhdGVzIHRoaXMgaXMgYSBkZXZp Y2Ugd2l0aCAKbXVsdGlwbGUgImxlZ3MiIHNvIHRoYXQgbm9ybWFsbHkgd2UgcXVlcnkgdGhhdCBh bmQgZG9uJ3QgaGF2ZSB0byBsb29rIGZvciB0aGUgCm1vcmUgY29tcGxpY2F0ZWQgaW5mb3JtYXRp b24uCgpSZWdhcmRzLAoKUmljCgoKLS0KZG0tZGV2ZWwgbWFpbGluZyBsaXN0CmRtLWRldmVsQHJl ZGhhdC5jb20KaHR0cHM6Ly93d3cucmVkaGF0LmNvbS9tYWlsbWFuL2xpc3RpbmZvL2RtLWRldmVs