I was just playing around with bcache, and set up an LV as the backing store for the cache: make-bcache -C -b512K /dev/sdb && echo /dev/sdb > /sys/fs/bcache/register make-bcache -B /dev/mapper/zapazoid-bacachetest && echo /dev/mapper-bacachetest > /sys/fs/bcache/register echo $CACHE_UUID > /sys/block/dm-11/bcache/attach mkfs.ext4 /dev/bcache0 mount /dev/bcache0 /mnt scp hercules.vistashare.net:/mnt/data/backups/2011-12-10-scylla-incr.tar.bz2* /mnt/ And there it hangs: [78411.767785] bcache: Caching dm-11, inserted new UUID 4fb485fd-25b0-4e6a-8a57-cb3889f984be [78601.490591] EXT4-fs (bcache0): mounted filesystem with ordered data mode. Opts: (null) [78962.976149] INFO: task jbd2/bcache0-8:22301 blocked for more than 120 seconds. [78962.976158] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [78962.976165] jbd2/bcache0-8 D 00000000 0 22301 2 0x00000000 [78962.976176] f2690e50 00000046 00000000 00000000 00000000 00000000 00000000 31b5d000 [78962.976193] 00000000 c14aa500 f2690ffc c14aa500 f2690e50 c14aa500 c14aa500 00000001 [78962.976208] 00000000 00000000 f2cb60c0 f2cb60c0 00000000 f2cb60c0 c10380ee 00000002 [78962.976221] Call Trace: [78962.976239] [<c10380ee>] ? load_balance+0x60/0x58a [78962.976282] [<f833ca94>] ? jbd2_journal_commit_transaction+0x17e/0xf36 [jbd2] [78962.976295] [<c100b769>] ? __switch_to+0x6f/0xe2 [78962.976305] [<c12c00df>] ? __schedule+0x58d/0x5b4 [78962.976316] [<c105115a>] ? wake_up_bit+0x56/0x56 [78962.976324] [<c102c141>] ? __wake_up_common+0x34/0x5a [78962.976332] [<c104562e>] ? lock_timer_base+0x19/0x34 [78962.976341] [<c1045a5f>] ? try_to_del_timer_sync+0x5c/0x63 [78962.976364] [<f8340dec>] ? kjournald2+0x9e/0x1c7 [jbd2] [78962.976373] [<c105115a>] ? wake_up_bit+0x56/0x56 [78962.976390] [<f8340d4e>] ? commit_timeout+0x5/0x5 [jbd2] [78962.976400] [<c1050e10>] ? kthread+0x63/0x68 [78962.976409] [<c1050dad>] ? kthread_worker_fn+0x114/0x114 [78962.976418] [<c12c6ebe>] ? kernel_thread_helper+0x6/0x10 Is there any reason bcache would not work with LVM in particular, or did I do something else that was silly? -davidc -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
