Closed
Description
System information
| Type | Version/Name |
|---|---|
| Operating System Name | FreeBSD |
| Distribution Version | 15.0-CURRENT |
| Kernel Version | git main, as of 6-Oct 2023. 13.1-RELEASE and 13.2-RELEASE are also affected |
| Architecture | amd64 |
| OpenZFS Version | zfs-2.2.99-FreeBSD_g0ee9b0239 zfs-kmod-2.2.99-FreeBSD_gf795e90a1 |
| Type | Version/Name |
|---|---|
| Operating System Name | Debian GNU/Linux |
| Distribution Version | 11.6 |
| Kernel Version | 5.10.0-21-amd64 |
| Architecture | amd64 |
| OpenZFS Version | zfs-2.0.3-9 zfs-kmod-2.0.3-9 |
Describe the problem you're observing
The kstat.zfs.<POOLNAME>.dataset.objset-0x<OBJID> sysctl nodes publish statistics about ZFS datasets, such as throughput. The "dataset_name" node contains the name of the ZFS dataset. For file system datasets, renaming the dataset also updates the value of dataset_name. But for zvols, it does not. After the rename, dataset_name still contains the dataset's prior name.
Describe how to reproduce the problem
These instructions work on FreeBSD. For Linux, do cat /proc/spl/kstat/zfs/testpool/objset-XXX instead of using sysctl.
$ zpool create testpool vtbd1
$ zfs create -V1m testpool/testvol
$ sysctl -n kstat.zfs.testpool.dataset.objset-$(printf 0x%x $(zfs get -Hpo value objsetid testpool/testvol)).dataset_name
testpool/testvol
$ sudo zfs rename testpool/testvol testpool/yyy
$ sysctl -n kstat.zfs.testpool.dataset.objset-$(printf 0x%x $(zfs get -Hpo value objsetid testpool/yyy)).dataset_name
testpool/testvol