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Thu, 15 Aug 2019 08:55:59 -0500 Received: from tew by calvin.localdomain with local (Exim 4.84_2) (envelope-from ) id 1hyGEQ-0003ds-Pl; Thu, 15 Aug 2019 08:55:58 -0500 Date: Thu, 15 Aug 2019 08:55:58 -0500 From: Tim Walberg To: Qu Wenruo Cc: Tim Walberg , linux-btrfs@vger.kernel.org Subject: Re: recovering from "parent transid verify failed" Message-ID: <20190815135558.GD2731@comcast.net> Reply-To: Tim Walberg References: <20190814183213.GA2731@comcast.net> <4be5086f-61e7-a108-8036-da7d7a5d5c11@gmx.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4be5086f-61e7-a108-8036-da7d7a5d5c11@gmx.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Also - here's 'btrfs inspect-internal dump-super /dev/sdc1': superblock: bytenr=65536, device=/dev/sdc1 --------------------------------------------------------- csum_type 0 (crc32c) csum_size 4 csum 0x4331039b [match] bytenr 65536 flags 0x1 ( WRITTEN ) magic _BHRfS_M [match] fsid 53749823-faaf-46f9-866d-3778d93cb1ca label btrfs1 generation 49750 root 229846646784 sys_array_size 129 chunk_root_generation 49725 root_level 1 chunk_root 2568857059328 chunk_root_level 1 log_root 0 log_root_transid 0 log_root_level 0 total_bytes 9001775738880 bytes_used 2085801975808 sectorsize 4096 nodesize 16384 leafsize (deprecated) 16384 stripesize 4096 root_dir 6 num_devices 3 compat_flags 0x0 compat_ro_flags 0x0 incompat_flags 0x361 ( MIXED_BACKREF | BIG_METADATA | EXTENDED_IREF | SKINNY_METADATA | NO_HOLES ) cache_generation 49748 uuid_tree_generation 49748 dev_item.uuid 7338a973-9a45-4032-a4c9-d18142fd7908 dev_item.fsid 53749823-faaf-46f9-866d-3778d93cb1ca [match] dev_item.type 0 dev_item.total_bytes 3000591912960 dev_item.bytes_used 1407675531264 dev_item.io_align 4096 dev_item.io_width 4096 dev_item.sector_size 4096 dev_item.devid 1 dev_item.dev_group 0 dev_item.seek_speed 0 dev_item.bandwidth 0 dev_item.generation 0 Although, 'btrfs inspect-internal logical-resolve ...' just says: # btrfs inspect-internal logical-resolve 229846466560 /dev/sdc1 ERROR: not a btrfs filesystem: /dev/sdc1 On 08/15/2019 10:35 +0800, Qu Wenruo wrote: >> >> >> On 2019/8/15 ??????2:32, Tim Walberg wrote: >> > Most of the recommendations I've found online deal with when "wanted" is >> > greater than "found", which, if I understand correctly means that one or >> > more transactions were interrupted/lost before fully committed. >> >> No matter what the case is, a proper transaction shouldn't have any tree >> block overwritten. >> >> That means, either the FLUSH/FUA of the hardware/lower block layer is >> screwed up, or the COW of tree block is already screwed up. >> >> > >> > Are the recommendations for recovery the same if the system is reporting a >> > "wanted" that is less than "found"? >> > >> The salvage is no difference than any transid mismatch, no matter if >> it's larger or smaller. >> >> It depends on the tree block. >> >> Please provide full dmesg output and btrfs check for further advice. >> >> Thanks, >> Qu >> End of included message -- +----------------------+ | Tim Walberg | | 830 Carriage Dr. | | Algonquin, IL 60102 | | twalberg@comcast.net | +----------------------+