Fix remounting ZFS filesystem with "zfs mount"
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Authored by asomers on Sep 5 2017, 6:57 PM.

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rS326328: MFC r323194:
rS324062: MFC r323194:
rS323194: Fix remounting ZFS filesystem with "zfs mount"

Summary

Fix remounting ZFS filesystem with "zfs mount"

"zfs mount -o" passes a list of mount options directly to nmount(2) after
sanity checking them. In particular, zfs(8) will refuse to mount an already
existing file system unless "remount" is specified in the option list.
However, the "remount" option only exists in Illumos. FreeBSD's equivalent is
"update".

PR: 221985