https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254058
Bug ID: 254058
Summary: zfs doesn't set mnt_time aka RootOnZFS doesn't work
without RTC
Product: Base System
Version: Unspecified
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
vfs_mountroot() extracts the most recent mnt_time from the mounted filesystems
(root and devfs at the time) and passes it to inittodr() as a fallback if there
isn't a functioning system RTC. This is intended to ensure that things like
log timestamps don't go backwards.
Unfortunately, only the UFS code actually initialises mnt_time so other root
filesystems types will leave mnt_time set to the epoch (1970-01-01 0000Z).
Root on NFS isn't impacted because that uses nfs_mountroot(), which does
inittodr() based on the remote filesystem.
That leaves ZFS: If a system with root on ZFS doesn't have a functioning RTC
then the system time will start at 1970-01-01 0000Z until (eg) NTP fixes it.
This leaves close-to-epoch timestamps strewn throughout the filesystem, which
is annoying.
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