Re: [ANNOUNCE] Btrfs: a copy on write, snapshotting FS

["Florian D." <flockmock@gmail.com>]

Chris Mason wrote:
> 
>> is it possible to test it on top of LVM2 on RAID at this stage?
> 
> Yes, I haven't done much multi-spindle testing yet, so I'm definitely
> interested in these numbers.
> 
> -chris
> 
> 

I did not get very far:


# insmod btrfs.ko
# mkfs.btrfs /dev/brain_volume_group/btrfstest
on close 0 blocks are allocated
fs created on /dev/brain_volume_group/btrfstest blocksize 4096 blocks
4980736

(/dev/brain_volume_group/btrfstest is a 20GB logical volume on top of
RAID6)

# mount /dev/brain_volume_group/btrfstest /mnt/temp/
(this gives these kernel-msgs:
[  385.980358] btrfs: dm-6 checksum verify failed on 4
[  385.980462] btrfs: dm-6 checksum verify failed on 12
[  385.980559] btrfs: dm-6 checksum verify failed on 11
)

# touch /mnt/temp/default/testfile.txt
[  445.445638] btrfs: dm-6 checksum verify failed on 10


# umount /mnt/temp/

[  457.980372] ------------[ cut here ]------------
[  457.980377] kernel BUG at fs/buffer.c:2644!
[  457.980379] invalid opcode: 0000 [1] PREEMPT
[  457.980382] CPU 0
[  457.980384] Modules linked in: btrfs snd_seq_midi cx88_dvb
cx88_vp3054_i2c video_buf_dvb snd_ice1712 snd_ice17xx_ak4xxx
snd_ak4xxx_adda snd_cs8427 snd_ac97_codec ac97_bus snd_i2c
snd_mpu401_uart snd_rawmidi cx8800 cx8802 cx88xx ir_common tveeprom
btcx_risc video_buf uhci_hcd
[  457.980397] Pid: 6040, comm: btrfs/0 Not tainted 2.6.21.5 #50
[  457.980400] RIP: 0010:[<ffffffff8021996c>]  [<ffffffff8021996c>]
submit_bh+0xf/0x102
[  457.980408] RSP: 0018:ffff81000bab7d30  EFLAGS: 00010246
[  457.980411] RAX: 000000000000a829 RBX: ffff81000ac207b0 RCX:
ffff81005f0458c8
[  457.980414] RDX: 0000000000000033 RSI: ffff81000ac207b0 RDI:
0000000000000001
[  457.980418] RBP: 0000000000000001 R08: ffff81000ccdd3f8 R09:
ffff81005fe78d50
[  457.980422] R10: 00000000025fffe0 R11: ffffffff802407c7 R12:
0000000000000000
[  457.980426] R13: ffff81001c16f480 R14: ffff81000ccdd3f8 R15:
ffff81000bab7d88
[  457.980430] FS:  00002b7554d54050(0000) GS:ffffffff80728000(0000)
knlGS:00000000f7e3f6b0
[  457.980434] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[  457.980437] CR2: 00002aaaaabaf000 CR3: 0000000003b06000 CR4:
00000000000006e0
[  457.980441] Process btrfs/0 (pid: 6040, threadinfo
ffff81000bab6000, task ffff81005dba8480)
[  457.980443] Stack:  ffff81000ac207b0 ffff81001c16f480
0000000000000000 ffffffff880988bb
[  457.980450]  ffff81001c16f480 ffff81000bab7d80 ffff81000fee76e0
ffffffff88099eb1
[  457.980455]  0000000100000000 ffff81001b318c10 ffff81001c16f180
0000000000000050
[  457.980459] Call Trace:
[  457.980471]  [<ffffffff880988bb>] :btrfs:write_ctree_super+0xd3/0x11f
[  457.980480]  [<ffffffff88099eb1>]
:btrfs:btrfs_commit_transaction+0x43e/0x5c0
[  457.980486]  [<ffffffff80257e4b>] cache_alloc_refill+0x2a3/0x4f7
[  457.980491]  [<ffffffff802873fb>] autoremove_wake_function+0x0/0x2e
[  457.980501]  [<ffffffff8809a033>]
:btrfs:btrfs_transaction_cleaner+0x0/0x141
[  457.980510]  [<ffffffff8809a0e0>]
:btrfs:btrfs_transaction_cleaner+0xad/0x141
[  457.980515]  [<ffffffff8024869c>] run_workqueue+0xb5/0x18e
[  457.980519]  [<ffffffff80245499>] worker_thread+0x0/0x145
[  457.980523]  [<ffffffff80287256>] keventd_create_kthread+0x0/0x89
[  457.980526]  [<ffffffff802455a8>] worker_thread+0x10f/0x145
[  457.980531]  [<ffffffff80277d4f>] default_wake_function+0x0/0xe
[  457.980535]  [<ffffffff80287256>] keventd_create_kthread+0x0/0x89
[  457.980540]  [<ffffffff802302cb>] kthread+0xca/0xfb
[  457.980545]  [<ffffffff80259318>] child_rip+0xa/0x12
[  457.980549]  [<ffffffff80287256>] keventd_create_kthread+0x0/0x89
[  457.980555]  [<ffffffff80230201>] kthread+0x0/0xfb
[  457.980558]  [<ffffffff8025930e>] child_rip+0x0/0x12
[  457.980561]
[  457.980562]
[  457.980563] Code: 0f 0b eb fe 8b 06 a8 20 75 04 0f 0b eb fe 48 83
7e 38 00 75
[  457.980571] RIP  [<ffffffff8021996c>] submit_bh+0xf/0x102
[  457.980576]  RSP <ffff81000bab7d30>


Linux localhost 2.6.21.5 #51 Fri Jun 15 20:53:36 CEST 2007 x86_64 AMD
Athlon(tm) 64 Processor 3200+ AuthenticAMD GNU/Linux