On Mon, Jan 6, 2020 at 8:02 PM Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx> wrote: > > On Sun, 5 Jan 2020, Clodoaldo Neto wrote: > > > I'm struggling to mount an encrypted backing device. The backing > > device is a RAID 1 array at /dev/md127 and the cache device is > > /dev/sdb1. > > > > # lsblk > > NAME MAJ:MIN RM SIZE RO > > TYPE MOUNTPOINT > > sda 8:0 0 223.6G 0 disk > > ├─sda1 8:1 0 700M 0 part /boot > > ├─sda2 8:2 0 700M 0 > > part /boot/efi > > ├─sda3 8:3 0 26G 0 part > > │ └─luks-9793c78f-723c-4218-865f-83dbc4659192 253:1 0 26G 0 crypt [SWAP] > > └─sda4 8:4 0 162G 0 part > > └─luks-569b1153-2fab-4984-b1b6-c4a02ee206ef 253:0 0 162G 0 crypt / > > sdb 8:16 0 111.8G 0 disk > > ├─sdb1 8:17 0 40G 0 part > > └─sdb2 8:18 0 71.8G 0 part > > sdc 8:32 0 1.8T 0 disk > > └─sdc1 8:33 0 1.8T 0 part > > └─md127 9:127 0 1.8T 0 raid1 > > sdd 8:48 0 1.8T 0 disk > > └─sdd1 8:49 0 1.8T 0 part > > └─md127 9:127 0 1.8T 0 raid1 > > sde 8:64 1 58.9G 0 disk > > ├─sde1 8:65 1 20G 0 part > > └─sde2 8:66 1 38.9G 0 part > > sr0 11:0 1 1024M 0 rom > > > > # blkid | grep -E "md127|sdb1" > > /dev/sdb1: UUID="535bfa2d-4c6e-4c19-91b2-d292872a1877" TYPE="bcache" > > PARTLABEL="Linux filesystem" > > PARTUUID="505789f1-0523-4c62-bdb1-81bc0cc7bff1" > > /dev/md127: UUID="b17ceaac-27ec-44d8-8bbb-235cfaa0c4a4" TYPE="bcache" > > > > It was working right when I installed Fedora 31 yesterday but then I > > resized the caching partition and I can't make it work again. > > > > This is what I tried > > > > # wipefs -a /dev/sdb1 > > /dev/sdb1: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 > > 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81 > > > > # make-bcache -C --writeback /dev/sdb1 > > UUID: eb7d8e72-f24c-48ee-bad0-771afccca876 > > Set UUID: 50e33260-4623-4374-9a61-c78b7d75280e > > version: 0 > > nbuckets: 81920 > > block_size: 1 > > bucket_size: 1024 > > nr_in_set: 1 > > nr_this_dev: 0 > > first_bucket: 1 > > > > # ll /sys/fs/bcache/ > > total 0 > > drwxr-xr-x. 7 root root 0 Jan 5 18:34 50e33260-4623-4374-9a61-c78b7d75280e > > --w-------. 1 root root 4096 Jan 5 17:39 pendings_cleanup > > --w-------. 1 root root 4096 Jan 5 18:03 register > > --w-------. 1 root root 4096 Jan 5 17:39 register_quiet > > > > # bcache-super-show /dev/sdb1 > > sb.magic ok > > sb.first_sector 8 [match] > > sb.csum C4CB62916B7825CE [match] > > sb.version 3 [cache device] > > > > dev.label (empty) > > dev.uuid eb7d8e72-f24c-48ee-bad0-771afccca876 > > dev.sectors_per_block 1 > > dev.sectors_per_bucket 1024 > > dev.cache.first_sector 1024 > > dev.cache.cache_sectors 83885056 > > dev.cache.total_sectors 83886080 > > dev.cache.ordered yes > > dev.cache.discard no > > dev.cache.pos 0 > > dev.cache.replacement 0 [lru] > > > > cset.uuid 50e33260-4623-4374-9a61-c78b7d75280e > > > > # echo /dev/md127 > /sys/fs/bcache/register > > # echo 50e33260-4623-4374-9a61-c78b7d75280e > /sys/block/md127/bcache/attach > > # blkid | grep bcache0 > > /dev/bcache0: UUID="7e2c0b40-8dec-4b13-8d00-b53b55160775" TYPE="crypto_LUKS" > > > > # bcache-status > > --- bcache --- > > UUID 50e33260-4623-4374-9a61-c78b7d75280e > > Block Size 512 B > > Bucket Size 512.00 KiB > > Congested? False > > Read Congestion 2.0ms > > Write Congestion 20.0ms > > Total Cache Size 40 GiB > > Total Cache Used 409.6 MiB (1%) > > Total Cache Unused 40 GiB (99%) > > Evictable Cache 40 GiB (100%) > > Replacement Policy [lru] fifo random > > Cache Mode writethrough [writeback] writearound none > > Total Hits 9 (64%) > > Total Misses 5 > > Total Bypass Hits 13 (16%) > > Total Bypass Misses 64 > > Total Bypassed 308.00 KiB > > > > # lsblk > > NAME MAJ:MIN RM SIZE RO > > TYPE MOUNTPOINT > > sda 8:0 0 223.6G 0 disk > > ├─sda1 8:1 0 700M 0 part /boot > > ├─sda2 8:2 0 700M 0 > > part /boot/efi > > ├─sda3 8:3 0 26G 0 part > > │ └─luks-9793c78f-723c-4218-865f-83dbc4659192 253:1 0 26G 0 crypt [SWAP] > > └─sda4 8:4 0 162G 0 part > > └─luks-569b1153-2fab-4984-b1b6-c4a02ee206ef 253:0 0 162G 0 crypt / > > sdb 8:16 0 111.8G 0 disk > > ├─sdb1 8:17 0 40G 0 part > > │ └─bcache0 252:0 0 1.8T 0 disk > > └─sdb2 8:18 0 71.8G 0 part > > sdc 8:32 0 1.8T 0 disk > > └─sdc1 8:33 0 1.8T 0 part > > └─md127 9:127 0 1.8T 0 raid1 > > └─bcache0 252:0 0 1.8T 0 disk > > sdd 8:48 0 1.8T 0 disk > > └─sdd1 8:49 0 1.8T 0 part > > └─md127 9:127 0 1.8T 0 raid1 > > └─bcache0 252:0 0 1.8T 0 disk > > sde 8:64 1 58.9G 0 disk > > ├─sde1 8:65 1 20G 0 part > > └─sde2 8:66 1 38.9G 0 part > > sr0 11:0 1 1024M 0 rom > > > > # mount /dev/bcache0 /r > > mount: /r: unknown filesystem type 'crypto_LUKS'. > > > > # cryptsetup open /dev/bcache0 backing-device > > Enter passphrase for /dev/bcache0: > > > > # mount /dev/mapper/backing-device /r > > mount: /r: unknown filesystem type 'bcache'. > > I'm guessing that make-bcache was run upon /dev/mapper/backing-device at > some point in time. Hopefully it wasn't clobbered. > I guess you are right because /dev/mapper/backing-device is seen as a cache device: # bcache-super-show /dev/mapper/backing-device sb.magic ok sb.first_sector 8 [match] sb.csum D9C2336DD00A6E69 [match] sb.version 3 [cache device] dev.label (empty) dev.uuid 8022eea3-fcf0-40b8-850a-31e5f841d0bd dev.sectors_per_block 1 dev.sectors_per_bucket 1024 dev.cache.first_sector 1024 dev.cache.cache_sectors 3774576640 dev.cache.total_sectors 3774577664 dev.cache.ordered yes dev.cache.discard no dev.cache.pos 0 dev.cache.replacement 0 [lru] cset.uuid 4a63d2b5-1568-473d-925d-53306af2ba7c Is there a path to revert it? Like just formatting it to ext4? > Try > > mount -t ext2 /dev/mapper/backing-device /r > ^^^^ or whatever your original FS really was. > # mount /dev/mapper/backing-device /r mount: /r: unknown filesystem type 'bcache'. > -- > Eric Wheeler > > > > > > What am I missing? > > > > Regards, Clodoaldo > >
