From: Eric Sandeen Subject: Re: Issue with bad file system Date: Mon, 19 Nov 2012 11:14:59 -0600 Message-ID: <50AA6913.2090104@redhat.com> References: <20121119083245.18044.qmail@science.horizon.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: George Spelvin , linux-ext4@vger.kernel.org To: Drew Reusser Return-path: Received: from mx1.redhat.com ([209.132.183.28]:30336 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753655Ab2KSRoV (ORCPT ); Mon, 19 Nov 2012 12:44:21 -0500 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On 11/19/12 10:57 AM, Drew Reusser wrote: > On Mon, Nov 19, 2012 at 8:32 AM, George Spelvin wrote: ... >> Another thing that would be useful is "dd if=/dev/md0 skip=2 count=2 | xxd" >> (or od -x if you don't have xxd). That will give a hex dump of the >> primary superblock, which might show the extent of the damage. >> >> > > > mint mnt # dd if=/dev/md0 skip=2 count=2 | xxd > 0000000: 3a3a 6b4e fd9b a66c 6467 f7a6 9fb0 9183 ::kN...ldg...... > 2+0 records in > 2+0 records out I'd actually start looking at block 0 too. Can you do that again, and drop the "skip?" as an aside - any chance there was supposed to be an encryption layer in there somewhere? The below looks pretty random. -Eric > 0000010: 3fc6 11aa 0cec 0441 6bc8 6b55 ff4d f2ba ?......Ak.kU.M.. > 0000020: a475 15d9 ea5d 6833 5608 df95 60cd 4f76 .u...]h3V...`.Ov > 0000030: 5490 5c22 e564 c91b 1913 a519 807a 8986 T.\".d.......z.. > 0000040: f3ba 3c8a 6c11 f78a bc94 5947 b55d d83f ..<.l.....YG.].? > 0000050: 2eac 0f3c ab20 d88d 1820 d5bc 0f97 aaf6 ...<. ... ...... > 0000060: 81f5 63cc 6eff 8e2e 54ad 50fe 291f 17f8 ..c.n...T.P.)... > 0000070: be01 67ad b9ec 49f7 fa60 953b 7348 9730 ..g...I..`.;sH.0 > 0000080: 6105 8f4d da9c 3ef3 e90e c190 6471 a766 a..M..>.....dq.f > 0000090: c90a 77f6 1196 3b74 9121 e89c 19bd 29f4 ..w...;t.!....). > 00000a0: 808c 3342 16e7 0c80 e8c3 3a6a 5560 78eb ..3B......:jU`x. > 00000b0: c0d9 c6d5 b386 a3a9 5275 7f5a f572 218b ........Ru.Z.r!. > 00000c0: 63d5 28f8 71aa 4f6f e716 060a 4a50 70cb c.(.q.Oo....JPp. > 00000d0: a740 8c5f e2df 2e65 11cd a88f c4ed c9bb .@._...e........ > 00000e0: d444 2da5 7e5d 7bb4 38f6 5fd0 60a8 d2cf .D-.~]{.8._.`... > 00000f0: 813f 9afd 26b8 8cc0 6e6a 59a2 e1f6 32ce .?..&...njY...2. > 0000100: 8c01 5928 5661 9687 fb9c b07d b412 4a57 ..Y(Va.....}..JW > 0000110: 2626 7099 c350 a893 3f76 1953 c34b 7ddf &&p..P..?v.S.K}. > 0000120: d73d 5e7f 9d3c f4fe dac9 e2d7 8eaf da94 .=^..<.......... > 0000130: 86fb cbfe 7866 45fa 72c9 a687 ea83 3b71 ....xfE.r.....;q > 0000140: 80cc 3320 59c3 c653 977d b6e3 79c4 5c3b ..3 Y..S.}..y.\; > 0000150: b36b c978 6824 d4b9 9252 04dd 39de 4c05 .k.xh$...R..9.L. > 0000160: d331 951b 3dff 8974 4ac1 1950 f6bd 5586 .1..=..tJ..P..U. > 0000170: 1095 f62c e7b3 d9d6 fbee 8cfb 5bd0 959e ...,........[... > 0000180: f6ae f551 1b41 a8cf ae40 435a ff05 c38e ...Q.A...@CZ.... > 0000190: 903d 2258 689e b64c f49d b7b3 593d f55c .="Xh..L....Y=.\ > 00001a0: fd4f f395 4ecd 6653 e46d 66b6 a046 a9cb .O..N.fS.mf..F.. > 00001b0: ee90 58d8 e876 5f63 5014 cbfe b0e1 cd53 ..X..v_cP......S > 00001c0: 12ac 43c5 2996 4a15 014e 3c7d a5c2 5842 ..C.).J..N<}..XB > 00001d0: 2e00 f2ea 3e12 fbe6 1403 e240 0e01 80d0 ....>......@.... > 00001e0: 1a03 c0c0 37fb 3cae df51 1818 987f e03b ....7.<..Q.....; > 00001f0: 718f b339 63e7 8495 56b4 045a 0091 7382 q..9c...V..Z..s. > 0000200: 9828 187e 5eab e288 a4c6 fd95 3950 f868 .(.~^.......9P.h > 0000210: 3ee5 5fe0 4943 8e1d 2315 41a7 0989 c97c >._.IC..#.A....| > 0000220: 992a c47b 9ccd e08a cfea 4603 2f51 e5e3 .*.{......F./Q.. > 0000230: 04c3 3224 bfaa f0fa 79ae 13db d774 8c87 ..2$....y....t.. > 0000240: fad8 93b1 ddc6 ce8c 90f3 e754 c6a4 ece3 ...........T.... > 0000250: 13ab 59e8 b5cc f5d1 c9ab 297f ba63 84a7 ..Y.......)..c.. > 0000260: c8ed bff6 9e55 a191 cfef c79e 6cd0 8ccd .....U......l... > 0000270: 83b1 de5a 3c26 1f81 e1fa b2ed 503a 2445 ...Z<&......P:$E > 0000280: 7212 2b2e 1242 18fb cac7 c3e5 73de fb2a r.+..B......s..* > 0000290: c0ed 2318 01ba 1f04 22f1 fb3d f356 c0a0 ..#....."..=.V.. > 00002a0: 258f 0184 6653 7814 e3ff b4ab 3276 7b9d %...fSx.....2v{. > 00002b0: 6c68 0b00 8024 68f0 47e6 2aad e447 674b lh...$h.G.*..GgK > 00002c0: 1a0c 0f85 e11d 5275 6d58 9940 e738 a3a8 ......RumX.@.8.. > 00002d0: 490f cdbc e710 9099 9dbd a688 00d8 a530 I..............0 > 00002e0: 843c 6665 a912 abdb 6c95 9e96 70dc f409 . 00002f0: f27a 3c12 15b0 c168 29a7 c190 f9ac 90c0 .z<....h)....... > 0000300: cd58 20ff 0461 ddcf 6617 9764 c352 a0de .X ..a..f..d.R.. > 0000310: 3818 e5e0 a168 49aa 8b98 2e6d 92f9 b575 8....hI....m...u > 0000320: d7dd 4651 1c54 c5e9 f96a d0f0 14c0 240a ..FQ.T...j....$. > 0000330: 3193 00e1 f895 6aba 0780 37c1 0f3a 3b3e 1.....j...7..:;> > 0000340: a8bb c25f 8148 0140 1825 7814 0a68 8e5e ..._.H.@.%x..h.^ > 0000350: 237b db47 9e5f 573c acbd 5d54 a1ae ce9c #{.G._W<..]T.... > 0000360: b498 c8cd e0dd 4c34 ee8a bf32 b7cf 0cca ......L4...2.... > 0000370: ba69 e0a7 e9ef 09c6 7c20 5007 7662 9c36 .i......| P.vb.6 > 0000380: f053 fda0 41f6 e560 1f2b ffbc 5344 407c .S..A..`.+..SD@| > 0000390: 9801 ee74 a1ef 236f 6b6c 50c0 2acf 8ebf ...t..#oklP.*... > 00003a0: f6ec 5049 7633 d215 1b35 af46 44e0 a7db ..PIv3...5.FD... > 00003b0: fd01 43ef c03d 2d44 7c21 d12c 75a3 f1f2 ..C..=-D|!.,u... > 00003c0: a459 e196 ce0f 6de0 19f1 d086 2504 2f09 .Y....m.....%./. > 00003d0: 6abe 5f04 4277 86c9 6b20 a054 bf82 0b5d j._.Bw..k .T...] > 00003e0: 3525 32b4 051a af5e 34af 1b29 0083 4987 5%2....^4..)..I. > 00003f0: c071 ab38 2567 0dff 54bc 2f8e 130e 33e2 .q.8%g..T./...3. > >