This is an automated cleanup. This bug report has been moved to QEMU's new bug tracker on gitlab.com and thus gets marked as 'expired' now. Please continue with the discussion here:
https://gitlab.com/qemu-project/qemu/-/issues/161 ** Changed in: qemu Status: New => Expired ** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #161 https://gitlab.com/qemu-project/qemu/-/issues/161 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1811543 Title: virtio-scsi gives improper discard sysfs entries Status in QEMU: Expired Bug description: Apologies if this is just an inherent part of paravirtualization that should be expected. In my host, I have an LVM thin pool with chunk_size 128MB. Within it, I have a thin volume "tmp". In the host: # fdisk -l /dev/lvm/tmp Disk /dev/lvm/tmp: 256 MiB, 268435456 bytes, 524288 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 262144 bytes / 134217728 bytes Disklabel type: gpt Disk identifier: BAE3154E-6E85-F642-8129-BAD7B58B2775 Device Start End Sectors Size Type /dev/lvm/tmp1 2048 524254 522207 255M Linux filesystem $ lsblk ... └─lvm-tmp 254:13 0 256M 0 lvm └─lvm-tmp1 254:14 0 255M 0 part $ cat /sys/dev/block/254:13/discard_alignment 0 $ cat /sys/dev/block/254:13/queue/discard_granularity 134217728 $ cat /sys/dev/block/254:13/queue/discard_max_bytes 17179869184 $ cat /sys/dev/block/254:13/queue/discard_max_hw_bytes 0 $ cat /sys/dev/block/254:13/queue/discard_zeroes_data 0 $ cat /sys/dev/block/254:14/discard_alignment 133169152 $ cat /sys/dev/block/254:14/queue/discard_granularity 134217728 $ cat /sys/dev/block/254:14/queue/discard_max_bytes 17179869184 $ cat /sys/dev/block/254:14/queue/discard_max_hw_bytes 0 $ cat /sys/dev/block/254:14/queue/discard_zeroes_data 0 If this is given to QEMU using virtio-scsi: -device virtio-scsi-pci,id=scsi1 \ -drive driver=raw,node-name=hdb,file=/dev/lvm/tmp,if=none,discard=unmap,id=hd2 \ -device scsi-hd,drive=hd2,bootindex=1 \ Then incorrect values are given: $ lsblk ... sdb 8:16 0 256M 0 disk └─sdb1 8:17 0 255M 0 part /mnt $ cat /sys/dev/block/8:16/discard_alignment 0 $ cat /sys/dev/block/8:16/queue/discard_granularity 4096 $ cat /sys/dev/block/8:16/queue/discard_max_bytes 1073741824 $ cat /sys/dev/block/8:16/queue/discard_max_hw_bytes 1073741824 $ cat /sys/dev/block/8:16/queue/discard_zeroes_data 0 $ cat /sys/dev/block/8:17/discard_alignment 133169152 And, there isn't even a /sys/dev/block/8:17/queue direcotry. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1811543/+subscriptions
