From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f179.google.com ([209.85.213.179]:34275 "EHLO mail-ig0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754616AbbGJNg7 (ORCPT ); Fri, 10 Jul 2015 09:36:59 -0400 Received: by igoe12 with SMTP id e12so35320348igo.1 for ; Fri, 10 Jul 2015 06:36:58 -0700 (PDT) Message-ID: <559FCA6D.8020800@gmail.com> Date: Fri, 10 Jul 2015 09:36:45 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: dsterba@suse.cz, sander@humilis.net, "Fajar A. Nugraha" , james harvey , linux-btrfs Subject: Re: btrfs subvolume clone or fork (btrfs-progs feature request) References: <559E6411.6090109@gmail.com> <20150709124121.GA25033@panda> <559E6D80.7010607@gmail.com> <20150709183355.GA726@twin.jikos.cz> In-Reply-To: <20150709183355.GA726@twin.jikos.cz> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms000802080005070104050407" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms000802080005070104050407 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-07-09 14:33, David Sterba wrote: > On Thu, Jul 09, 2015 at 08:48:00AM -0400, Austin S Hemmelgarn wrote: >> On 2015-07-09 08:41, Sander wrote: >>> Austin S Hemmelgarn wrote (ao): >>>>> What's wrong with "btrfs subvolume snapshot"? >>>> >>>> Well, personally I would say the fact that once something is tagged = as >>>> a snapshot, you can't change it to a regular subvolume without doing= a >>>> non-incremental send/receive. >>> >>> A snapshot is a subvolume. There is no such thing as "tagged as a >>> snapshot". >>> >> No, there is a bit in the subvolume metadata that says whether it's >> considered a snapshot or not. > > Technically it's not really a bit. The snapshot relation is determined > by the parent uuid value of a subvolume. I'm actually kind of curious, is the parent UUID actually used for=20 anything outside of send/receive? > >> Internally, they are handled identically, >> but it does come into play when you consider things like btrfs subvolu= me >> show -s (which only lists snapshots), > > That was probably 'btrfs subvol list -s', though the 'subvol show' > command prints all snapshots of a given subvolume. You're right, I just have a tendency to get the two confused because my=20 workflow means that I don't use either very frequently. > >> which in turn means that certain >> tasks are more difficult to script robustly. > > I don't deny the interface/output is imperfect for scripting purposes, > maybe we can provide filters that would satisfy your usecase. > Personally, I don't really do much direct scripting of BTRFS related=20 tasks (although that might change if I can convince my boss that we=20 should move to BTRFS for our server systems). Most of my complaint with = the current arrangement is primarily aesthetic more than anything else. --------------ms000802080005070104050407 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGuDCC BrQwggScoAMCAQICAxBuVTANBgkqhkiG9w0BAQ0FADB5MRAwDgYDVQQKEwdSb290IENBMR4w HAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmlu ZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZzAeFw0xNTAz MjUxOTM0MzhaFw0xNTA5MjExOTM0MzhaMGMxGDAWBgNVBAMTD0NBY2VydCBXb1QgVXNlcjEj MCEGCSqGSIb3DQEJARYUYWhmZXJyb2luN0BnbWFpbC5jb20xIjAgBgkqhkiG9w0BCQEWE2Fo ZW1tZWxnQG9oaW9ndC5jb20wggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCdD/zW 2rRAFCLnDfXpWxU1+ODqRVUgzHvrRO7ADUxRo1CBDc3JSX5TIW2OGmQ3DAKGOACp8Z0sgxMc B05tzAZ/M7m4jajVrwwdVCdrwVGxTdAai7Kwg4ZCVfyMVhcwo8R2eW3QahBx34G0RKumK9sZ ZQSQ+zULAzpY6uz7T1sAk/erMoivRXF6u8WvOsLkOD1F/Xyv1ZccSUG5YeDgZgc0nZUBvyIp zXSHjgWerFkrxEM3y2z/Ff3eL1sgGYecV/I1F+I5S01V7Kclt/qRW10c/4JEGRcI1FmrJBPu BtMYPbg/3Y9LZROYN+mVIFxZxOfrmjfFZ96xt/TaMXo8vcEKtWcNEjhGBjEbfMUEm4aq8ygQ 4MuEcpJc8DJCHBkg2KBk13DkbU2qNepTD6Uip1C+g+KMr0nd6KOJqSH27ZuNY4xqV4hIxFHp ex0zY7mq6fV2o6sKBGQzRdI20FDYmNjsLJwjH6qJ8laxFphZnPRpBThmu0AjuBWE72GnI1oA aO+bs92MQGJernt7hByCnDO82W/ykbVz+Ge3Sax8NY0m2Xdvp6WFDY/PjD9CdaJ9nwQGsUSa N54lrZ2qMTeCI9Vauwf6U69BA42xgk65VvxvTNqji+tZ4aZbarZ7el2/QDHOb/rRwlCFplS/ z4l1f1nOrE6bnDl5RBJyW3zi74P6GwIDAQABo4IBWTCCAVUwDAYDVR0TAQH/BAIwADBWBglg hkgBhvhCAQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg b3ZlciB0byBodHRwOi8vd3d3LkNBY2VydC5vcmcwDgYDVR0PAQH/BAQDAgOoMEAGA1UdJQQ5 MDcGCCsGAQUFBwMEBggrBgEFBQcDAgYKKwYBBAGCNwoDBAYKKwYBBAGCNwoDAwYJYIZIAYb4 QgQBMDIGCCsGAQUFBwEBBCYwJDAiBggrBgEFBQcwAYYWaHR0cDovL29jc3AuY2FjZXJ0Lm9y ZzAxBgNVHR8EKjAoMCagJKAihiBodHRwOi8vY3JsLmNhY2VydC5vcmcvcmV2b2tlLmNybDA0 BgNVHREELTArgRRhaGZlcnJvaW43QGdtYWlsLmNvbYETYWhlbW1lbGdAb2hpb2d0LmNvbTAN BgkqhkiG9w0BAQ0FAAOCAgEAGvl7xb42JMRH5D/vCIDYvFY3dR2FPd5kmOqpKU/fvQ8ovmJa p5N/FDrsCL+YdslxPY+AAn78PYmL5pFHTdRadT++07DPIMtQyy2qd+XRmz6zP8Il7vGcEDmO WmMLYMq4xV9s/N7t7JJp6ftdIYUcoTVChUgilDaRWMLidtslCdRsBVfUjPb1bF5Ua31diKDP e0M9/e2CU36rbcTtiNCXhptMigzuL3zJXUf2B9jyUV8pnqNEQH36fqJ7YTBLcpq3aYa2XbAH Hgx9GehJBIqwspDmhPCFZ/QmqUXCkt+XfvinQ2NzKR6P3+OdYbwqzVX8BdMeojh7Ig8x/nIx mQ+/ufstL1ZYp0bg13fyK/hPYSIBpayaC76vzWovkIm70DIDRIFLi20p/qTd7rfDYy831Hjm +lDdCECF9bIXEWFk33kA97dgQIMbf5chEmlFg8S0e4iw7LMjvRqMX3eCD8GJ2+oqyZUwzZxy S0Mx+rBld5rrN7LsXwZ671HsGqNeYbYeU25e7t7/Gcc6Bd/kPfA+adEuUGFcvUKH3trDYqNq 6mOkAd8WO/mQadlc3ztS++XDMhmIpfBre9MPAr6usqf+wc+R8Nk9KLK39kEgrqVfzc/fgf8L MaD4rHnusdg4gca6Yi+kNrm99anw7SwaBrBvULYBp7ixNRUhaYiNW4YjTrYxggShMIIEnQIB ATCBgDB5MRAwDgYDVQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5v cmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEW EnN1cHBvcnRAY2FjZXJ0Lm9yZwIDEG5VMAkGBSsOAwIaBQCgggH1MBgGCSqGSIb3DQEJAzEL BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTE1MDcxMDEzMzY0NVowIwYJKoZIhvcNAQkE MRYEFAL7xVqI39InPLjYTEa2QmMCqVcOMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEq MAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwIC AUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgwgZEGCSsGAQQBgjcQBDGBgzCBgDB5MRAwDgYD VQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMT GUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2Fj ZXJ0Lm9yZwIDEG5VMIGTBgsqhkiG9w0BCRACCzGBg6CBgDB5MRAwDgYDVQQKEwdSb290IENB MR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2ln bmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZwIDEG5V MA0GCSqGSIb3DQEBAQUABIICAHTPZ0kauoI/FYsumwAIklcnTeer1Bq8d12WEUFnm+ImVAV0 C7YPyEy0GR3t6XHyQJHYrM8JS7bnTWx71xsl1+pnaMujtd879vF+ztaSF3cN5PLX1usSo+y8 cLYXLHuUuGSUmxXhvDdP8/hrnNk6d6CdhCxApPPKv4UdRBLlp4AhPNzIBqGnxFpXmnod1vQi twY6pSnM/qpRFZbBxdxLi5XpVZ6/aPTMGcCbWELTn6mvaUnudkwCeLEVsj5baACiSunkZ4v9 nNLTW768du5N8M0XBoy6Q0eFvlOVKOwWmvJpGGqmvTl2SbloUNn7GhJhtBKHByHA81Qb12iM ISy4xis+75idljTJynC3vagj0lT7YM2U8pcCbznAJ+b5h0HP7MZqjN6/4FzLXRT4+7pFicuF n1C4VFW+4J8RscZlqJ8g0uI6kOj9JZz70FgiBXg4D+aO3wp7NdwMDpeQ5WWRXoZISd2IZDr1 DMX9acnYLkp/sFNaQ3d9C+4La/grRrPzL1XWq9Rw6zZEy21PJGHxhmv9VLItlPQEKEOup9Ax nVgj1ogWZhX4AS1KRPeI8d0ijrQ3P21pTJ1UHSP7smErTBr16QsV8PtVNLKjUrnoxkE3WfX2 lBDVbH2idVLSiXfliwCtzVz5LPiL6nwvM/sljokBQkHBN69CKNDcKj7ENOx6AAAAAAAA --------------ms000802080005070104050407--