From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f181.google.com ([209.85.213.181]:37486 "EHLO mail-ig0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751147AbbDHLhc (ORCPT ); Wed, 8 Apr 2015 07:37:32 -0400 Received: by igblo3 with SMTP id lo3so35596080igb.0 for ; Wed, 08 Apr 2015 04:37:31 -0700 (PDT) Message-ID: <552512E9.2090805@gmail.com> Date: Wed, 08 Apr 2015 07:37:13 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: js7.in@samsung.com, "linux-btrfs@vger.kernel.org" Subject: Re: Porting BTRFS to user space References: <455311443.534051428451031043.JavaMail.weblogic@epmlwas09b> In-Reply-To: <455311443.534051428451031043.JavaMail.weblogic@epmlwas09b> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms070208070707080409020808" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms070208070707080409020808 Content-Type: text/plain; charset=euc-kr Content-Transfer-Encoding: quoted-printable On 2015-04-07 19:57, =C0=CE=C1=A4=BD=C4 wrote: > Thank you for the information. > I just found that btrfs-progs includes several files that seem modified= from btrfs kernel source. > I am not sure exactly what they are. > Web pages say libbtrfs is to provide interface for apps that use btrfs.= > Why should there be duplicated codes between kernel and user space? > Is it an on-going effort to port whole btrfs to user space? >=20 > Could you lead me to some more information about libbtrfs or how to por= t btrfs to user space? >=20 > Thank you, > Jeongsik >=20 >=20 As far as I understand it, the intent is to allow things like btrfs check and btrfs restore to still work even if the kernel doesn't have btrfs support. From what I can tell, you are the first person to actually be serious about getting BTRFS running in userspace, so there probably isn't much BTRFS specific literature out there. I would, however suggest looking at the FUSE drivers for ext4 and ZFS, as those are both ported from kernel space, and should give some good examples of where to start. --------------ms070208070707080409020808 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 BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTE1MDQwODExMzcxM1owIwYJKoZIhvcNAQkE MRYEFDVzz30WBzcewq5zVKXvQgHKQ6YsMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEq MAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwIC AUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgwgZEGCSsGAQQBgjcQBDGBgzCBgDB5MRAwDgYD VQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMT GUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2Fj ZXJ0Lm9yZwIDEG5VMIGTBgsqhkiG9w0BCRACCzGBg6CBgDB5MRAwDgYDVQQKEwdSb290IENB MR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2ln bmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZwIDEG5V MA0GCSqGSIb3DQEBAQUABIICAJzSu45pcqg7VYv2FsZf+r3a27+FqCHAztwRWpZ4Gbhujabe XsD1tPCrE+3E8Gg1FO5GnoPgmXkURc/qveUBOKAaPAtfwtDIdyuRhp9NoyypaoVc72pnbXkN Ealfy8yquwWBf5FBiLzCH1nx/jJwMuZAhkfziTkRy0Mx/Auj5NVTw0dS5s0J6ysu5zmP4+xd H+StFRNb2Isz+oDTPE0suniu/ROqeAqUB/ft0u0hxFr7NePF5iYDAc6XTmVkxghUK+gEg4Hy P7RMUFFb8WW8txZo9zhnC2hdKpdDtoF6A3yyjbrO41V/Sx+EwW+aMMmR9YBe7lJc6DaT/GjT Ex6saK8Z6hF4K9FkwuaZ9yJhkjo2OISoELZ9g5qL9QLbh5W027w5vIOaVmBnh7lPJPtxWJz9 dev+EKWIV11OzEpo92bbPA0yF/CHJfYJDDYa7HUA8veDunixs6t1eVtIyOQleoaT3KK/3SI9 RNRVpebw3XiWLwKTwmzn2kovpHwRC36UmOkrArAionQhJhRgWlIZmD0QkfdB0I5ncT1v44gl 8TlTWgvpSlKGBfJN3w8flIOrhepS0liPWlBzvBZXJ8eZvP2K2JMsyQLcAOQjRGYK1ZohBi+y bqa+7WuNquBL4YG+bS5X/+OWskAgHRD1FPMC3ILvQOp0hXRD0U+L9KhQF9LGAAAAAAAA --------------ms070208070707080409020808--