I have a ~350 GB Btrfs filesystem that is corrupted. I think the
damage was caused by a bad SATA cable. I can mount the filesystem
and read most of the data (I already have backups of most everything).
The scrub is aborted after a few seconds with the following error in
the kernel log:
parent transid verify failed on 795639808 wanted 102145 found 101462
parent transid verify failed on 795639808 wanted 102145 found 101462
verify_parent_transid: 16273 callbacks suppressed
...
Trying to remove the corrupted directory tree results in the following:
device label DATA devid 1 transid 102169 /dev/sda2
btrfs: enabling auto recovery
btrfs: disk space caching is enabled
verify_parent_transid: 12197 callbacks suppressed
parent transid verify failed on 795062272 wanted 102145 found 101462
...
------------[ cut here ]------------
WARNING: at fs/btrfs/super.c:256 __btrfs_abort_transaction+0x43/0xb6()
Hardware name: MS-7388
btrfs: Transaction aborted
...
Pid: 24332, comm: rm Not tainted 3.8.0-rc4 #66
Call Trace:
[<ffffffff81162000>] ? __btrfs_abort_transaction+0x39/0xb6
[<ffffffff8102cf85>] warn_slowpath_common+0x7e/0x97
[<ffffffff8102d032>] warn_slowpath_fmt+0x41/0x43
[<ffffffff81198d6e>] ? set_extent_dirty+0x1b/0x1d
[<ffffffff8116200a>] __btrfs_abort_transaction+0x43/0xb6
[<ffffffff81170db9>] __btrfs_free_extent+0x612/0x64e
[<ffffffff811950eb>] ? btrfs_get_token_32+0x79/0xc7
[<ffffffff811b8fa9>] ? btrfs_merge_delayed_refs+0x24b/0x266
[<ffffffff81173cfe>] run_clustered_refs+0x7e3/0x8b9
[<ffffffff81176b20>] btrfs_run_delayed_refs+0xde/0x268
[<ffffffff811843f8>] __btrfs_end_transaction+0xd8/0x2cf
[<ffffffff8118461a>] btrfs_end_transaction+0xb/0xd
[<ffffffff81186b15>] __unlink_end_trans+0x5e/0x63
[<ffffffff8118baf1>] btrfs_unlink+0x86/0xa0
[<ffffffff810bc29f>] vfs_unlink+0x6f/0xdc
[<ffffffff810bc3f9>] do_unlinkat+0xed/0x199
[<ffffffff810b1d2e>] ? vfs_write+0x100/0x127
[<ffffffff810b1f32>] ? sys_write+0x44/0x75
[<ffffffff810bdf8a>] sys_unlinkat+0x1d/0x29
[<ffffffff8147f9d2>] system_call_fastpath+0x16/0x1b
---[ end trace ce4d352b0ec7d230 ]---
BTRFS error (device sda2) in __btrfs_free_extent:5184: IO failure
btrfs is forced readonly
btrfs: run_one_delayed_ref returned -5
I've tried btrfsck but it fails as well. Is there some way I can
remove the damaged data and save the good or is a re-format the only
solution?
Neil
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