Can't change an open zvol's volsize after a rename

[asomers]

System information

Type	Version/Name
Distribution Name	FreeBSD
Distribution Version	FreeBSD
Kernel Version	13.2-RELEASE, 14.0-RELEASE, 15.0-CURRENT
Architecture	amd64
OpenZFS Version	zfs-kmod-2.1.9-FreeBSD_g92e0d9d18, zfs-kmod-2.2.0-FreeBSD_g95785196f, zfs-kmod-2.2.99-440-FreeBSD_g90ba19eb7

Describe the problem you're observing

It should be possible to successfully do zfs set volsize on a zvol even if that zvol is currently open. Indeed it works. However, if the zvol was renamed prior to being opened, then this command will fail with EBUSY.

Describe how to reproduce the problem

sudo zfs create -V 1m -o volmode=dev zroot/test/testvol
sudo zfs rename zroot/test/testvol zroot/test/testvol2
#  In a separate terminal, open the device and hold it open, for example using this Python one-liner:
#  fd = open("/dev/zvol/zroot/test/testvol2")
sudo zfs set volsize=8g zroot/test/testvol2
cannot set property for 'zroot/test/testvol2': dataset is busy

Include any warning/errors/backtraces from the system logs

None

Investigation so far

Using dtrace, I've determined that zvol_find_by_name_hash, as called by zvol_set_volsize, works when the zvol has not been renamed. But if the zvol has been renamed, then this function fails. Therefore, I suspect a bug in zvol_os_rename_minor. I intend to keep working on the problem.