https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290259
Bug ID: 290259
Summary: nvme: need an ioctl to get serial number
Product: Base System
Version: 16.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The standard way to get a disk's serial number is with the DIOCGIDENT ioctl.
However, /dev/nvmeX devices don't support that, probably because they aren't
technically disks. An NVME device's corresponding nda driver _does_. However,
it may be difficult to determine which nda device corresponds to a given nvme
device, if NVME namespaces are in use.
Within the kernel, the nvme driver already knows its serial number. It's
recorded in nvme_controller_data.sn . But it simply isn't exposed to user
space.
I propose that we implement DIOCGIDENT on nvme devices. Or, if that name is
objectionable we could use NVME_IOCTL_SERIAL or NVME_IOCTL_IDENT. This would
allow a user to lookup an NVME device's serial number without first translating
the nvme device node into an nda device node.
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