Hello,
new on the btrfs list, my name is Arjan Filius.
new with btrfs i used my old laptop disk as USB external disk now,
formatted with btrfs, running ubuntu 10.04LTS alpha. (x86_64)
while running (for some reason) on that USB/btrfs:
~/bin$ cat manydir.sh
#!/bin/bash
declare -i counter=0
DIRS="1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49"
for dirA in $DIRS
do
mkdir $dirA
cd $dirA
for dirB in $DIRS
do
mkdir $dirB
cd $dirB
for dirC in $DIRS
do
mkdir $dirC
cd $dirC
touch $DIRS
cd ..
done
cd ..
done
cd ..
done
and doing/trying a "mount -i remount,noatime /dev/sdb" after a while,
because the possible time gain.
I found getting my system unusable (slow). i looked in my syslog and
found a
warning like:
Mar 3 13:48:02 arfi-laptop kernel: [24960.532815] INFO: task mount:30662
blocked for more than 120 seconds.
Mar 3 13:48:02 arfi-laptop kernel: [24960.532819] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 3 13:48:02 arfi-laptop kernel: [24960.532822] mount D
00000000ffffffff 0 30662 21991 0x00000000
Mar 3 13:48:02 arfi-laptop kernel: [24960.532827] ffff8800b2543c78
0000000000000082 0000000000015b00 0000000000015b00
Mar 3 13:48:02 arfi-laptop kernel: [24960.532838] ffff8801384903c0
ffff8800b2543fd8 0000000000015b00 ffff880138490000
Mar 3 13:48:02 arfi-laptop kernel: [24960.532842] 0000000000015b00
ffff8800b2543fd8 0000000000015b00 ffff8801384903c0
Mar 3 13:48:02 arfi-laptop kernel: [24960.532847] Call Trace:
Mar 3 13:48:02 arfi-laptop kernel: [24960.532857] [<ffffffff81162770>] ?
bdi_sched_wait+0x0/0x20
Mar 3 13:48:02 arfi-laptop kernel: [24960.532860] [<ffffffff8116277e>]
bdi_sched_wait+0xe/0x20
Mar 3 13:48:02 arfi-laptop kernel: [24960.532865] [<ffffffff8155d60f>]
__wait_on_bit+0x5f/0x90
Mar 3 13:48:02 arfi-laptop kernel: [24960.532868] [<ffffffff81162770>] ?
bdi_sched_wait+0x0/0x20
Mar 3 13:48:02 arfi-laptop kernel: [24960.532872] [<ffffffff8155d6b8>]
out_of_line_wait_on_bit+0x78/0x90
Mar 3 13:48:02 arfi-laptop kernel: [24960.532876] [<ffffffff810835c0>] ?
wake_bit_function+0x0/0x40
Mar 3 13:48:02 arfi-laptop kernel: [24960.532880] [<ffffffff81162734>] ?
bdi_queue_work+0xa4/0xe0
Mar 3 13:48:02 arfi-laptop kernel: [24960.532883] [<ffffffff81163aaf>]
bdi_sync_writeback+0x6f/0x80
Mar 3 13:48:02 arfi-laptop kernel: [24960.532887] [<ffffffff81163ae0>]
sync_inodes_sb+0x20/0x30
Mar 3 13:48:02 arfi-laptop kernel: [24960.532890] [<ffffffff811675c2>]
__sync_filesystem+0x82/0x90
Mar 3 13:48:02 arfi-laptop kernel: [24960.532901] [<ffffffff811677cb>]
sync_filesystem+0x4b/0x70
Mar 3 13:48:02 arfi-laptop kernel: [24960.532905] [<ffffffff81141e74>]
do_remount_sb+0x54/0x190
Mar 3 13:48:02 arfi-laptop kernel: [24960.532908] [<ffffffff8115b454>]
do_remount+0x174/0x210
Mar 3 13:48:02 arfi-laptop kernel: [24960.532911] [<ffffffff8115e12d>]
do_mount+0x1bd/0x250
Mar 3 13:48:02 arfi-laptop kernel: [24960.532915] [<ffffffff8115e250>]
sys_mount+0x90/0xe0
Mar 3 13:48:02 arfi-laptop kernel: [24960.532920] [<ffffffff810131f2>]
system_call_fastpath+0x16/0x1b
which is explainable i think, as my disk was quite busy.
however, as my system got quite unasable, and i wanted back to work, i
tried first just to unplug the USB disk, in the hope i could back to work.
no luck.. a hard reboot was required (or more time perhaps)
But here it comes, after the reboot, i cant't mont the btrfs USB disk, and
get with the latest git version:
# ./btrfsck /dev/sdb
parent transid verify failed on 38783700992 wanted 22494 found 22498
parent transid verify failed on 38783700992 wanted 22494 found 22498
parent transid verify failed on 38783700992 wanted 22494 found 22498
btrfsck: disk-io.c:739: open_ctree_fd: Assertion `!(!tree_root->node)'
failed.
Aborted (core dumped)
the code lines disk-io.c:
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super),
blocksize, generation);
BUG_ON(!tree_root->node); <<<< line 739
and:
# ./btrfs-show /dev/sdb
failed to read /dev/sr0
Label: none uuid: d68dc8f3-ab9f-46ac-b041-3de619f71283
Total devices 1 FS bytes used 52.27GB
devid 1 size 111.79GB used 111.79GB path /dev/sdb
Btrfs v0.19-4-gab8fb4c
root@arfi-laptop:~/btrfs/btrfs-progs-unstable#
Is there a way, witch may lead to recover my data, or copy my data of the
disk, or even better recover the filesystem?
I can live without it, but if it can be done, i realy would like that.
Thanks , and thanks in advance
ps:
more or less a same situation on:
http://www.mail-archive.com/linux-btrfs@xxxxxxxxxxxxxxx/msg03863.html
Regards,
--
Arjan Filius
mailto:iafilius@xxxxxxxxx
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