The version in that git repository is old; I've got another version with
many bug fixes. I ought to have a new version up soon (I have to rebase
onto a vanilla kernel) - unfortunately, the on disk format is in flux at
the moment, so it's probably a bad time to try it out for anything but
testing.
(If you're feeling really adventurous, the on disk format changes won't
require you to reformat the backing device; you can always detach the
cache device so migrating shouldn't be hard. But keep in mind the
barrier issue mentioned in the wiki still exists - bcache won't support
barriers until it's in a kernel with stable pages for writeback and we
add data checksumming for the journal).
I'm hoping to be done with the on disk format changes in around a month.
Sorry you had to trip over some bugs... I think I'm going to try and
figure out a way to rebase my code from the internal tree to vanilla
2.6.34 so I can do it more often).
On 06/25/11 07:41, Gary Chen wrote:
Hi all,
I cloned the whole git kernel of bcache, after building, installing and followed
the steps:
make-bcache -B /dev/sdb
make-bcache -C -w2k -b1M -j64 /dev/sdc
echo /dev/sdb> /sys/fs/bcache/register
echo /dev/sdc> /sys/fs/bcache/register
mkfs.ext4 /dev/bcache0
mount /dev/bcache0 /mnt
echo<UUID> > /sys/block/sdb/bcache/attach
Then I tried to copy some files into backing device, it will always ended up
with the following exception.
Did I miss anything?
Thanks in advance!
[ 338.484902] bcache: invalidating existing data
[ 338.485867] bcache: journal replay done, 0 keys in 0 entries
[ 338.486000] bcache: loaded cache device sdc
[ 370.746292] EXT4-fs (bcache0): mounted filesystem with ordered data mode
[ 455.012810] bcache: Caching sdb, inserted new UUID
[ 759.001294] BUG: unable to handle kernel paging request at f81cdf14
[ 759.001306] IP: [<c12447d6>] bio_insert+0x486/0x840
[ 759.001335] *pde = 3641b067 *pte = 00000000
[ 759.001340] Oops: 0002 [#1] SMP
[ 759.001345] last sysfs file:
/sys/fs/bcache/55c83915-531d-4855-807c-2db26d742a11/tree_depth
[ 759.001354] Modules linked in: binfmt_misc snd_intel8x0 snd_ac97_codec
ac97_bus snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
snd_seq_device ppdev parport_pc joydev snd psmouse serio_raw soundcore
snd_page_alloc i2c_piix4 lp parport usbhid hid ahci e1000
[ 759.001374]
[ 759.001380] Pid: 1624, comm: jbd2/bcache0-8 Not tainted 2.6.34-bcache #2
/VirtualBox
[ 759.001385] EIP: 0060:[<c12447d6>] EFLAGS: 00010282 CPU: 0
[ 759.001390] EIP is at bio_insert+0x486/0x840
[ 759.001394] EAX: 00000000 EBX: ef89f120 ECX: f81cdf10 EDX: ef86b800
[ 759.001399] ESI: 00001df1 EDI: 00000000 EBP: ee1d3d2c ESP: ee1d3c8c
[ 759.001403] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 759.001408] Process jbd2/bcache0-8 (pid: 1624, ti=ee1d2000 task=f43d26a0
task.ti=ee1d2000)
[ 759.001412] Stack:
[ 759.001416] ef89f130 00000000 0000000b ee1d3cd8 000000e2 e6902299 f43d26a0
ef87a2e4
[ 759.001423]<0> ef87a25c 00179836 00000000 f432ce80 ef87a264 00ef89f1
00000000 f6e86000
[ 759.001430]<0> ffffffff ee1d3d2c ef89f130 00000000 00000008 f6e865a8
f6e86000 ef87a210
[ 759.001437] Call Trace:
[ 759.001449] [<c1249f5d>] ? bcache_make_request+0x2ed/0x5c0
[ 759.001455] [<c103be1a>] ? update_curr+0x17a/0x350
[ 759.001462] [<c1229d38>] ? generic_make_request+0x368/0x510
[ 759.001467] [<c10357a2>] ? resched_task+0x22/0x70
[ 759.001474] [<c1043c8a>] ? try_to_wake_up+0xba/0x430
[ 759.001479] [<c1229f5a>] ? submit_bio+0x7a/0x110
[ 759.001485] [<c1131de0>] ? bio_alloc_bioset+0x40/0xc0
[ 759.001491] [<c112cfcf>] ? submit_bh+0xdf/0x110
[ 759.001497] [<c112da49>] ? sync_dirty_buffer+0x49/0xd0
[ 759.001503] [<c11c8b8c>] ? jbd2_journal_update_superblock+0x8c/0x140
[ 759.001510] [<c11c3572>] ? jbd2_journal_commit_transaction+0xe82/0x10f0
[ 759.001515] [<c1035b06>] ? hrtick_update+0x36/0x40
[ 759.001521] [<c103c763>] ? dequeue_task_fair+0x43/0x50
[ 759.001526] [<c1001e0e>] ? __switch_to+0xbe/0x170
[ 759.001542] [<c1029928>] ? default_spin_lock_flags+0x8/0x10
[ 759.001552] [<c14bdf1f>] ? _raw_spin_lock_irqsave+0x2f/0x50
[ 759.001556] [<c1057bdb>] ? lock_timer_base.clone.50+0x2b/0x50
[ 759.001558] [<c1057f22>] ? try_to_del_timer_sync+0x72/0xc0
[ 759.001561] [<c11c7e7f>] ? kjournald2+0x8f/0x1c0
[ 759.001564] [<c10663e0>] ? autoremove_wake_function+0x0/0x50
[ 759.001566] [<c11c7df0>] ? kjournald2+0x0/0x1c0
[ 759.001568] [<c1066024>] ? kthread+0x74/0x80
[ 759.001571] [<c1065fb0>] ? kthread+0x0/0x80
[ 759.001573] [<c100353e>] ? kernel_thread_helper+0x6/0x10
[ 759.001574] Code: ff 8b 7d 98 0f b6 8d 68 ff ff ff 0f ad fe d3 ef f6 c1 20 74
04 89 fe 31 ff 89 75 d0 8b 4d d0 89 7d d4 c1 e1 04 03 8a 30 01 00 00<3e> ff 41
04 8b 53 14 83 c0 01 89 c7 c1 ff 1f c1 ea 1c 83 e2 07
[ 759.001595] EIP: [<c12447d6>] bio_insert+0x486/0x840 SS:ESP 0068:ee1d3c8c
[ 759.001599] CR2: 00000000f81cdf14
[ 759.001601] ---[ end trace 2e15f07eadf04a6e ]---
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