From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f177.google.com ([209.85.213.177]:35403 "EHLO mail-ig0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753638AbbEOLZM (ORCPT ); Fri, 15 May 2015 07:25:12 -0400 Received: by igbyr2 with SMTP id yr2so213779090igb.0 for ; Fri, 15 May 2015 04:25:11 -0700 (PDT) Message-ID: <5555D78D.5040909@gmail.com> Date: Fri, 15 May 2015 07:25:01 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: Christian , linux-btrfs@vger.kernel.org Subject: Re: Mysterious device (id 0). References: In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms090904050702070309060901" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms090904050702070309060901 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-05-14 20:09, Christian wrote: > Hi, > > My laptop has a small ext4 /boot partition /dev/sda1 and a large btrfs > partition containing / and /home as a sub volume /dev/sda3 > > When I run scrub on /dev/sda3 and check status with sudo btrfs scrub > status -d /dev/sda3 I get: > > scrub status for 3d52dc93-c89f-453f-965d-8601d11e7710 > scrub device /dev/sda3 (id 1) history > scrub started at Thu May 14 19:54:02 2015 and finished after 235 > seconds > total bytes scrubbed: 111.03GiB with 0 errors > scrub device (id 0) history > scrub started at Thu May 14 19:54:02 2015 and was aborted after 0 > seconds > total bytes scrubbed: 0.00B with 0 errors > > As device (id 0) is indicated, but I have no idea what it is. > > When I run scrub with a script (cron) the same device (id 0) shows up i= n > a warning: > > /etc/cron.daily/btrfs-scrub: > WARNING: device 0 not present > scrub device /dev/sda3 (id 1) done > scrub started at Sat May 2 08:03:46 2015 and finished after 241 > seconds > total bytes scrubbed: 109.06GiB with 0 errors > scrub device (id 0) canceled > scrub started at Sat May 2 08:03:46 2015 and was aborted after 0 > seconds > total bytes scrubbed: 0.00B with 0 errors > > What is this device (id 0) which never gets scrubbed but always shows u= p? > > I'm running Ubuntu 15.04 with the 3.19.0-16-generic kernel. > Have you ever run 'btrfs replace' to replace a device in the filesystem? = I know that new device in a replace operation get's tagged as device=20 id 0 until the replace operation completes (at which point it gets the=20 devid of the device it replaced). Personally, this is the only case=20 that I know of that devid 0 is actually used in the code. Thinking=20 further though, it might also be an off-by-one error somewhere, although = I have no idea where. --------------ms090904050702070309060901 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 BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTE1MDUxNTExMjUwMVowIwYJKoZIhvcNAQkE MRYEFCeA3YiMtpZmwsjRhbPCK1QMce9gMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEq MAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwIC AUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgwgZEGCSsGAQQBgjcQBDGBgzCBgDB5MRAwDgYD VQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMT GUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2Fj ZXJ0Lm9yZwIDEG5VMIGTBgsqhkiG9w0BCRACCzGBg6CBgDB5MRAwDgYDVQQKEwdSb290IENB MR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2ln bmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZwIDEG5V MA0GCSqGSIb3DQEBAQUABIICAI2kQV4F73FcQuV+A3kIE9iey6tWUPTxZRw2UUGrzmErUcSL vuW+BAKt8jiKikr22fireuHpYJa3ogiFKXccmc/6qxw2nFESFRCmbBrcncDRpZPKhc6/FBlo kKbaPe6/ynSVMPdHo1Bclwr4ufwdWFrNF4yDSJLMroxdHzrk4XQ4g3Q2UUbOfd9pRcqKWLou iW/wiBlc9KAQtvpI2mqyA5g14HW+jV8KcQg8d20LHUyRYRDBKSNqpAz9ztNWuNW1czRcZAx5 Pt05kZMYIKOx/FbcrQtDSb/Tr3rO3Zh9HaOojBoOpnxp4mhX3Z5HQwOYkMcrd/GnVVsLCfZ+ 794Thi9Wpf+sCg0yNOdvVmsNjNUjlJfcXDbvft/UNKsWiM9NYamARIHtgXzqjaSvMK8V4Vzi 0kA+3dwpz4jS17IShufDSFd58zCv4FParS7eUCnrOkrm9DcUyjH+v4WwBIK/r860p+qp5gjN QTlkU3DLqW0n0tV0iA9mXLcP0j9IuizgSXuMBJVYMjkLZ1BB+j+hBm52Kqi8gW4AowrXLt0H PtfinkWOFlH8B6IRjgYyBANfDORwjtjHW/dqJex1SwIR5LNlYEKch4CfI2DvBgkYmP8kH4TO 5SuhA1+vTo8itB9E9LvRzzvuCxj3KVtcnY0FpVoioBEq5o34Z7MImqtiwn3qAAAAAAAA --------------ms090904050702070309060901--