Hi! 1. # ./bcache format --compression_type=lz4 --error_action=readonly --tier=0 /dev/system10/bcache --tier=1 /dev/sdd1 /dev/system10/bcache contains a bcache filesystem Proceed anyway? (y,n) y /dev/sdd1 contains a bcache filesystem Proceed anyway? (y,n) y UUID: ab597c6a-7394-41ff-9138-e66c5722bc9d Set UUID: 311a03a9-3646-40a8-935f-10030ee75b25 version: 6 nbuckets: 22288 block_size: 1 bucket_size: 1024 nr_in_set: 2 nr_this_dev: 0 first_bucket: 3 UUID: 2ac11eef-6d66-4ca0-bd6e-17ac83c6942a Set UUID: 311a03a9-3646-40a8-935f-10030ee75b25 version: 6 nbuckets: 40960 block_size: 1 bucket_size: 1024 nr_in_set: 2 nr_this_dev: 1 first_bucket: 3 # mount -o noatime -t bcache /dev/system10/bcache:/dev/sdd1 /mnt/test # dd if=/dev/urandom of=/mnt/test/randomdata bs=1M count=1000 # md5sum /mnt/test/randomdata a7d2712c673d891d9ba50f2f7157c091 /mnt/test/randomdata # cat /sys/fs/bcache/311a03a9-3646-40a8-935f-10030ee75b25/tiering_percent 10 # echo 1 > /sys/fs/bcache/311a03a9-3646-40a8-935f-10030ee75b25/tiering_percent ; sleep 5 ; umount /mnt/test Now I'm getting in dmesg: Aug 25 11:55:04 localhost kernel: [ 1366.385581] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.385600] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.390298] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.391076] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.391098] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.391111] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.417244] bcache (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only Aug 25 11:55:04 localhost kernel: [ 1366.656319] bcache (311a03a9-3646-40a8-935f-10030ee75b25): stopped Now: # mount -o noatime -t bcache /dev/system10/bcache:/dev/sdd1 /mnt/test # md5sum /mnt/test/randomdata a7d2712c673d891d9ba50f2f7157c091 /mnt/test/randomdata So it is ok. But logs in dmesg are a little scary. I had data corruption in similar situation like this but I can't reproduce it. Btw, should be bcachefs immune of power reset while IO activity? 2. Unsuccessful try of unregister device: # echo 1 > /sys/fs/bcache/311a03a9-3646-40a8-935f-10030ee75b25/cache1/unregister and console hangs. I have acces to files from other console. In dmesg is: Aug 25 12:07:48 localhost kernel: [ 2130.432099] INFO: task bash:19379 blocked for more than 30 seconds. Aug 25 12:07:48 localhost kernel: [ 2130.432105] Tainted: P O 4.7.0-bcache+ #5 Aug 25 12:07:48 localhost kernel: [ 2130.432108] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 25 12:07:48 localhost kernel: [ 2130.432111] bash D ffff88014857bc88 0 19379 19376 0x00000000 Aug 25 12:07:48 localhost kernel: [ 2130.432118] ffff88014857bc88 0000000000000000 ffff88014a1a1b40 ffff8800c8f78000 Aug 25 12:07:48 localhost kernel: [ 2130.432124] ffff88014857bcb0 ffff88014857c000 ffffffffc0785244 ffff8800c8f78000 Aug 25 12:07:48 localhost kernel: [ 2130.432129] 00000000ffffffff ffffffffc0785248 ffff88014857bca0 ffffffff8156fcea Aug 25 12:07:48 localhost kernel: [ 2130.432135] Call Trace: Aug 25 12:07:48 localhost kernel: [ 2130.432147] [<ffffffff8156fcea>] schedule+0x3a/0x90 Aug 25 12:07:48 localhost kernel: [ 2130.432152] [<ffffffff81570163>] schedule_preempt_disabled+0x13/0x20 Aug 25 12:07:48 localhost kernel: [ 2130.432155] [<ffffffff81571c3b>] __mutex_lock_slowpath+0x9b/0x140 Aug 25 12:07:48 localhost kernel: [ 2130.432159] [<ffffffff81571cf2>] mutex_lock+0x12/0x30 Aug 25 12:07:48 localhost kernel: [ 2130.432202] [<ffffffffc075f8be>] bch_cache_remove+0x1e/0xe0 [bcache] Aug 25 12:07:48 localhost kernel: [ 2130.432218] [<ffffffffc0762605>] __bch_cache_store+0x245/0x650 [bcache] Aug 25 12:07:48 localhost kernel: [ 2130.432234] [<ffffffffc0762a44>] bch_cache_store+0x34/0x50 [bcache] Aug 25 12:07:48 localhost kernel: [ 2130.432238] [<ffffffff81206272>] sysfs_kf_write+0x32/0x40 Aug 25 12:07:48 localhost kernel: [ 2130.432240] [<ffffffff812057f3>] kernfs_fop_write+0x113/0x190 Aug 25 12:07:48 localhost kernel: [ 2130.432243] [<ffffffff8118e5c2>] __vfs_write+0x32/0x150 Aug 25 12:07:48 localhost kernel: [ 2130.432247] [<ffffffff812e8a33>] ? __this_cpu_preempt_check+0x13/0x20 Aug 25 12:07:48 localhost kernel: [ 2130.432251] [<ffffffff8109f201>] ? update_fast_ctr+0x41/0x70 Aug 25 12:07:48 localhost kernel: [ 2130.432253] [<ffffffff8109f262>] ? percpu_down_read+0x12/0x50 Aug 25 12:07:48 localhost kernel: [ 2130.432256] [<ffffffff8118f8c3>] vfs_write+0xb3/0x1b0 Aug 25 12:07:48 localhost kernel: [ 2130.432258] [<ffffffff81190ce0>] SyS_write+0x50/0xc0 Aug 25 12:07:48 localhost kernel: [ 2130.432261] [<ffffffff811adbde>] ? __close_fd+0x9e/0xc0 Aug 25 12:07:48 localhost kernel: [ 2130.432264] [<ffffffff8157431f>] entry_SYSCALL_64_fastpath+0x17/0x93 iostat show: # iostat -d 1 3 /dev/sdd1 /dev/mapper/system10-bcache Linux 4.7.0-bcache+ (marcinm) 25.08.2016 _x86_64_ (4 CPU) Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sdd1 0,90 2,40 56,36 5920 138772 dm-14 21,32 919,34 423,55 2263587 1042859 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sdd1 1,00 0,00 64,00 0 64 dm-14 2,00 64,00 0,50 64 0 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sdd1 1,00 0,00 64,00 0 64 dm-14 2,00 64,00 0,50 64 0 Thanks, Marcin -- 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
