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Renaming a zvol does not update the kstat's dataset_name #15482

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asomers opened this issue Nov 2, 2023 · 3 comments · Fixed by #15486
Closed

Renaming a zvol does not update the kstat's dataset_name #15482

asomers opened this issue Nov 2, 2023 · 3 comments · Fixed by #15486
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Type: Defect Incorrect behavior (e.g. crash, hang)

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@asomers
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asomers commented Nov 2, 2023

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
@asomers asomers added the Type: Defect Incorrect behavior (e.g. crash, hang) label Nov 2, 2023
asomers added a commit to asomers/zfs that referenced this issue Nov 2, 2023
@asomers
Update the kstat dataset_name when renaming a zvol
1740ba6 
Closes		openzfs#15482 (for FreeBSD only)
Sponsored-by:	Axcient
Signed-off-by:	Alan Somers <[email protected]>
@lundman
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lundman commented Nov 2, 2023

Ah that is true and probably also the case in Solaris/illumos, certainly the case in Windows/macOS.

@asomers
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asomers commented Nov 2, 2023

I'm testing a fix for FreeBSD now.

asomers added a commit to asomers/zfs that referenced this issue Nov 2, 2023
@asomers
Update the kstat dataset_name when renaming a zvol
d212be6 
Closes		openzfs#15482 (for FreeBSD only)
Sponsored-by:	Axcient
Signed-off-by:	Alan Somers <[email protected]>
@lundman
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lundman commented Nov 2, 2023

I see no immediate reason that wouldn't work for Windows/macOS..?

asomers added a commit to asomers/zfs that referenced this issue Nov 2, 2023
@asomers
Update the kstat dataset_name when renaming a zvol
9d26ce1 
Closes		openzfs#15482 (for FreeBSD only)
Sponsored-by:	Axcient
Signed-off-by:	Alan Somers <[email protected]>
@asomers asomers mentioned this issue Nov 3, 2023
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asomers added a commit to asomers/zfs that referenced this issue Nov 3, 2023
@asomers
Update the kstat dataset_name when renaming a zvol, on Linux
11dc3e8 
Closes          openzfs#15482 (for Linux only)
Sponsored-by:   Axcient
Signed-off-by:  Alan Somers <[email protected]>
behlendorf pushed a commit that referenced this issue Nov 7, 2023
@asomers
Update the kstat dataset_name when renaming a zvol
e36ff84 
Add a dataset_kstats_rename function, and call it when renaming
a zvol on FreeBSD and Linux.

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Alan Somers <[email protected]>
Sponsored-by: Axcient
Closes #15482
Closes #15486
lundman pushed a commit to openzfsonwindows/openzfs that referenced this issue Dec 12, 2023
@asomers @lundman
Update the kstat dataset_name when renaming a zvol
358a711 
Add a dataset_kstats_rename function, and call it when renaming
a zvol on FreeBSD and Linux.

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Alan Somers <[email protected]>
Sponsored-by: Axcient
Closes openzfs#15482
Closes openzfs#15486
mmatuska pushed a commit to mmatuska/zfs that referenced this issue Dec 27, 2023
@asomers @mmatuska
Update the kstat dataset_name when renaming a zvol
de438c4 
Add a dataset_kstats_rename function, and call it when renaming
a zvol on FreeBSD and Linux.

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Alan Somers <[email protected]>
Sponsored-by: Axcient
Closes openzfs#15482
Closes openzfs#15486
behlendorf pushed a commit that referenced this issue Jan 9, 2024
@asomers @behlendorf
Update the kstat dataset_name when renaming a zvol
c34fe8d 
Add a dataset_kstats_rename function, and call it when renaming
a zvol on FreeBSD and Linux.

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Alan Somers <[email protected]>
Sponsored-by: Axcient
Closes #15482
Closes #15486
@jgottula jgottula mentioned this issue Jun 17, 2024
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Update the kstat dataset_name when renaming a zvol asomers/zfs
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@asomers @lundman