Public bug reported: On 4.10 kernel, when creating bcache devices, each device kname is now incremented by 16
/dev/bcache0 /dev/bcache16 /dev/bcache32 etc. This was to support partitioning of bcache devices[1], however, This also will limit the number of bcache devices and doesn't match how other block devices name themselves, md for example, you get md0p1, md1p1, md2p1 etc. Ideally we'd continue to see devices increment by 1, and ensure we allocate partition numbers as well. I think the patch[1] below is incomplete; I think we also want to shift the minor value by the number of partitions when we set the disk_name value. drivers/md/bcache/super.c: snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor); to snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor >> 4); This should keep the devname index based, while creating the device node with the appropriate space for partitions, like this: $ ls -al /dev/bcache* brw-rw---- 1 root disk 251, 0 Feb 22 17:40 /dev/bcache0 brw-rw---- 1 root disk 251, 1 Feb 22 17:40 /dev/bcache0p1 brw-rw---- 1 root disk 251, 16 Feb 22 17:40 /dev/bcache1 brw-rw---- 1 root disk 251, 17 Feb 22 17:40 /dev/bcache1p1 1. https://www.spinics.net/lists/linux-bcache/msg04267.html ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: linux-image-4.10.0-8-generic 4.10.0-8.10 ProcVersionSignature: User Name 4.10.0-8.10-generic 4.10.0-rc8 Uname: Linux 4.10.0-8-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 22 17:36 seq crw-rw---- 1 root audio 116, 33 Feb 22 17:36 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.4-0ubuntu2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A Date: Wed Feb 22 17:41:18 2017 Ec2AMI: ami-0000056c Ec2AMIManifest: FIXME Ec2AvailabilityZone: nova Ec2InstanceType: m1.small Ec2Kernel: unavailable Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: OpenStack Foundation OpenStack Nova PciMultimedia: ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-8-generic root=UUID=15278dff-350d-42a1-8767-1424dfca7894 ro console=tty1 console=ttyS0 RelatedPackageVersions: linux-restricted-modules-4.10.0-8-generic N/A linux-backports-modules-4.10.0-8-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: Ubuntu-1.8.2-1ubuntu1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-xenial dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr13.1.2:cvnQEMU:ct1:cvrpc-i440fx-xenial: dmi.product.name: OpenStack Nova dmi.product.version: 13.1.2 dmi.sys.vendor: OpenStack Foundation ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug curtin ec2-images zesty ** Tags added: curtin -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1667078 Title: bcache device numbers increase by 16 Status in linux package in Ubuntu: Confirmed Bug description: On 4.10 kernel, when creating bcache devices, each device kname is now incremented by 16 /dev/bcache0 /dev/bcache16 /dev/bcache32 etc. This was to support partitioning of bcache devices[1], however, This also will limit the number of bcache devices and doesn't match how other block devices name themselves, md for example, you get md0p1, md1p1, md2p1 etc. Ideally we'd continue to see devices increment by 1, and ensure we allocate partition numbers as well. I think the patch[1] below is incomplete; I think we also want to shift the minor value by the number of partitions when we set the disk_name value. drivers/md/bcache/super.c: snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor); to snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor >> 4); This should keep the devname index based, while creating the device node with the appropriate space for partitions, like this: $ ls -al /dev/bcache* brw-rw---- 1 root disk 251, 0 Feb 22 17:40 /dev/bcache0 brw-rw---- 1 root disk 251, 1 Feb 22 17:40 /dev/bcache0p1 brw-rw---- 1 root disk 251, 16 Feb 22 17:40 /dev/bcache1 brw-rw---- 1 root disk 251, 17 Feb 22 17:40 /dev/bcache1p1 1. https://www.spinics.net/lists/linux-bcache/msg04267.html ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: linux-image-4.10.0-8-generic 4.10.0-8.10 ProcVersionSignature: User Name 4.10.0-8.10-generic 4.10.0-rc8 Uname: Linux 4.10.0-8-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 22 17:36 seq crw-rw---- 1 root audio 116, 33 Feb 22 17:36 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.4-0ubuntu2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A Date: Wed Feb 22 17:41:18 2017 Ec2AMI: ami-0000056c Ec2AMIManifest: FIXME Ec2AvailabilityZone: nova Ec2InstanceType: m1.small Ec2Kernel: unavailable Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: OpenStack Foundation OpenStack Nova PciMultimedia: ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-8-generic root=UUID=15278dff-350d-42a1-8767-1424dfca7894 ro console=tty1 console=ttyS0 RelatedPackageVersions: linux-restricted-modules-4.10.0-8-generic N/A linux-backports-modules-4.10.0-8-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: Ubuntu-1.8.2-1ubuntu1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-xenial dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr13.1.2:cvnQEMU:ct1:cvrpc-i440fx-xenial: dmi.product.name: OpenStack Nova dmi.product.version: 13.1.2 dmi.sys.vendor: OpenStack Foundation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667078/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
