https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221985
Bug ID: 221985
Summary: "zfs mount -o remount" is broken
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: asom...@freebsd.org
The "remount" option to the "zfs mount" subcommand is not documented in the man
page, but it is supported by Illumos. It is used to temporarily change a
filesystem's properties while the fs is mounted.
# On Illumos
$ mount | grep foo
/foo on foo read/write/setuid/devices/nonbmand/exec/xattr/atime/dev=4350004 on
Fri Sep 1 15:09:49 2017
$ sudo zfs mount -o remount,noatime foo
$ mount | grep foo
/foo on foo read/write/setuid/devices/nonbmand/exec/xattr/noatime/dev=4350004
on Fri Sep 1 15:10:06 2017
# On FreeBSD
> zfs mount -o remount,atime testpool
cannot mount 'testpool': mountpoint or dataset is busy
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