From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from avasout06.plus.net ([212.159.14.18]:54661 "EHLO avasout06.plus.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754892AbeD1OOX (ORCPT ); Sat, 28 Apr 2018 10:14:23 -0400 From: "David C. Partridge" To: References: <003801d3de56$fba1b930$f2e52b90$@perdrix.co.uk> <035a8b69-127a-0b7f-28e0-67c0a3e3f5c7@gmx.com> <003801d3def2$d90965c0$8b1c3140$@perdrix.co.uk> <004d01d3def6$4000ed40$c002c7c0$@perdrix.co.uk> <60674123-6fe2-2cfe-e7a8-25d62e023c53@gmx.com> In-Reply-To: <60674123-6fe2-2cfe-e7a8-25d62e023c53@gmx.com> Subject: RE: Problems with btrfs Date: Sat, 28 Apr 2018 15:06:49 +0100 Message-ID: <006201d3defa$2783dda0$768b98e0$@perdrix.co.uk> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0063_01D3DF02.894893C0" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a multipart message in MIME format. ------=_NextPart_000_0063_01D3DF02.894893C0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Here's the log you asked for ... David -----Original Message----- From: Qu Wenruo [mailto:quwenruo.btrfs@gmx.com]=20 Sent: 28 April 2018 14:54 To: David C. Partridge Subject: Re: Problems with btrfs On 2018=E5=B9=B404=E6=9C=8828=E6=97=A5 21:38, David C. Partridge wrote: > Oh! doing a private build from source a bit beyond my skill level :( = Are there alternatives like climbing in with a disk editor or is there = too much to change? It's possible to only modify that offending tree block. But I can't ensure the safety, thus I recommend to use = btrfs-corrupt-block. Since it's not convenient for you, then let's go that way. Please provide the following dump: # btrfs inspect dump-tree -t chunk Then I could calculate the offset on-disk for you to do a binary dump = and send that tree block back to me to hand patch it. >=20 > I'm prepared to install a newer version of btrfs-progs if that will = fix the problem (assuming I can find a suitable package file). >=20 > I'm assuming that I'll likely also need to update the kernel? Not exactly. If latest btrfs check gives no error after fix, even old kernel should = handle it well without problem. But as a generic advice, it's recommended to use latest kernel for btrfs = if possible. And currently there is nothing sensitive in the thread = (btrfs-inspect.log could contain some filenames, but nothing sensitive = right now), so it's better to CC the mail to mail list, just in case = some other guy could provide extra help. (Next mail may be after 8~10 hours, as it's bed time for my timezone) Thanks, Qu >=20 > David >=20 > -----Original Message----- > From: Qu Wenruo [mailto:quwenruo.btrfs@gmx.com] > Sent: 28 April 2018 14:25 > To: David C. Partridge > Subject: Re: Problems with btrfs >=20 >=20 >=20 > On 2018=E5=B9=B404=E6=9C=8828=E6=97=A5 21:14, David C. Partridge = wrote: >> Here's the output from >> >> # btrfs inspect dump-tree /dev/mapper/Charon--vg-root | grep -C 20 >> 224304857088 >=20 > Located the problem: >=20 > item 382 key (224304857088 EXTENT_ITEM 16384) itemoff 14495 itemsize = 51 > extent refs 1 gen 735989 flags TREE_BLOCK > tree block key (4401028 UNKNOWN.0 0) level 0 > ^^^^^^^^^^^^^^^^^^^ > shared block backref parent 140827475968 >=20 > It could be fixed by special crafted btrfs-corrupt-block tool to = handle it. > Although this means you need to compile btrfs-progs by yourself with = special branch. >=20 > Before patching btrfs-progs, I'd like to double check if other part is = correct. >=20 > Please execute the following command: > # btrfs inspect dump-tree -b 140827475968 /dev/mapper/Charon--vg-root >=20 > If the output is correct, I could start patching btrfs-corrupt-block = then. > But please be aware of that, this could only fix the problem found in = extent tree, I'm not 100% sure if there will be other problems, as the = btrfs-progs is pretty old. >=20 > Thanks, > Qu >=20 >> >> HtH >> David >> >=20 ------=_NextPart_000_0063_01D3DF02.894893C0 Content-Type: application/octet-stream; name="btrfs-dump-chunk.log" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="btrfs-dump-chunk.log" btrfs-progs v4.7.3=0A= chunk tree=0A= leaf 302570274816 items 68 free space 8933 generation 849190 owner 3=0A= fs uuid a0a6c5a6-061f-4c86-bc14-7f9abf3cb57e=0A= chunk uuid 98c0b1e7-1845-4803-8965-22f0a655353d=0A= item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 16185 itemsize 98=0A= dev item devid 1 total_bytes 78852915200 bytes used 68144857088=0A= dev uuid 5e27c2ed-872b-4bcf-946f-d7f9e81e2c32=0A= item 1 key (FIRST_CHUNK_TREE CHUNK_ITEM 124046540800) itemoff 16105 = itemsize 80=0A= chunk length 1073741824 owner 2 stripe_len 65536=0A= type DATA num_stripes 1=0A= stripe 0 devid 1 offset 51577356288=0A= dev uuid: 5e27c2ed-872b-4bcf-946f-d7f9e81e2c32=0A= item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 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