Forgot to CC Marc.
On 07/10/2018 09:33 AM, Su Yue wrote:
[FWD to linux-btrfs]
Thanks to Marc's patient of running and tests btrfsck lowmem mode
in recent days.
The FS has a large extent tree but luckily few are corrupted, they are
all fixed by special version. Reloc trees were cleaned too.
So the FS can be mounted with RW.
However, the remaining errors of extent data in file trees are
unresloved, they are all about holes.
Since I'm not familiar with kernel code, not sure how serious those
errors are and what result could be during write/read those wrong
items.
Marc also has some questions in the part forwarded, replies are
always welcome.
Error messages are showed in the last.
-------- Forwarded Message --------
Subject: Re: So, does btrfs check lowmem take days? weeks?
Date: Mon, 9 Jul 2018 10:48:18 -0700
From: Marc MERLIN <m...@merlins.org>
To: Su Yue <damenly...@gmx.com>
CC: quwenruo.bt...@gmx.com, Su Yue <suy.f...@cn.fujitsu.com>
Success!
Well done Su, this is a huge improvement to the lowmem code. It went
from days to less than 3 hours.
I'll paste the logs below.
Questions:
1) I assume I first need to delete a lot of snapshots. What is the limit
in your opinion?
100? 150? other?
2) my filesystem is somewhat misbalanced. Which balance options do you
think are safe to use?
3) Should I start a scrub now (takes about 1 day) or anything else to
check that the filesystem is hopefully not damaged anymore?
4) should btrfs check reset the corrupt counter?
bdev /dev/mapper/dshelf2 errs: wr 0, rd 0, flush 0, corrupt 2, gen 0
for now, should I reset it manually?
Thanks,
Marc
gargamel:/var/local/src/btrfs-progs.sy# ./btrfsck --mode=lowmem -q
--repair /dev/mapper/dshelf2
enabling repair mode
WARNING: low-memory mode repair support is only partial
Checking filesystem on /dev/mapper/dshelf2
UUID: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
Created new chunk [18460145811456 1073741824]
Add one extent data backref [84302495744 69632]
Add one extent data backref [84302495744 69632]
Add one extent data backref [125712527360 12214272]
Add one extent data backref [125730848768 5111808]
Add one extent data backref [125730848768 5111808]
Add one extent data backref [125736914944 6037504]
Add one extent data backref [125736914944 6037504]
Add one extent data backref [129952120832 20242432]
Add one extent data backref [129952120832 20242432]
Add one extent data backref [134925357056 11829248]
Add one extent data backref [134925357056 11829248]
Add one extent data backref [147895111680 12345344]
Add one extent data backref [147895111680 12345344]
Add one extent data backref [150850146304 17522688]
Add one extent data backref [156909494272 55320576]
Add one extent data backref [156909494272 55320576]
good luck!
found 0 bytes used, no error found
total csum bytes: 0
total tree bytes: 0
total fs tree bytes: 0
total extent tree bytes: 0
btree space waste bytes: 0
file data blocks allocated: 0
referenced 0
gargamel:/var/local/src/btrfs-progs.sy# ./btrfsck --mode=lowmem -q
/dev/mapper/dshelf2
Checking filesystem on /dev/mapper/dshelf2
UUID: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
good luck!
found 251650048 bytes used, no error found
total csum bytes: 0
total tree bytes: 0
total fs tree bytes: 0
total extent tree bytes: 0
btree space waste bytes: 0
file data blocks allocated: 0
referenced 0
gargamel:/var/local/src/btrfs-progs.sy# ./btrfsck -c /dev/mapper/dshelf2
Checking filesystem on /dev/mapper/dshelf2
UUID: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
found 0 bytes used, no error found
total csum bytes: 0
total tree bytes: 0
total fs tree bytes: 0
total extent tree bytes: 0
btree space waste bytes: 0
file data blocks allocated: 0
referenced 0
gargamel:/var/local/src/btrfs-progs.sy# mount /dev/mapper/dshelf2 /mnt/mnt
[671283.314558] BTRFS info (device dm-2): disk space caching is enabled
[671283.334226] BTRFS info (device dm-2): has skinny extents
[671285.191740] BTRFS info (device dm-2): bdev /dev/mapper/dshelf2 errs:
wr 0, rd 0, flush 0, corrupt 2, gen 0
[671395.371313] BTRFS info (device dm-2): enabling ssd optimizations
[671400.884013] BTRFS info (device dm-2): checking UUID tree
(hung about 2-3mn but worked eventually)
gargamel:/mnt/mnt# btrfs fi show .
Label: 'dshelf2' uuid: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
Total devices 1 FS bytes used 12.59TiB
devid 1 size 14.55TiB used 13.81TiB path /dev/mapper/dshelf2
gargamel:/mnt/mnt# btrfs fi df .
Data, single: total=13.57TiB, used=12.48TiB
System, DUP: total=32.00MiB, used=1.55MiB
Metadata, DUP: total=124.50GiB, used=116.92GiB
Metadata, single: total=216.00MiB, used=0.00B
GlobalReserve, single: total=512.00MiB, used=42.62MiB
gargamel:/mnt/mnt# btrfs subvolume list . | wc -l
270
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