Softupdates a mount option?

[Claus Assmann]

OpenBSD is doing this for a while:

MOUNT(8)                OpenBSD System Manager's Manual               MOUNT(8)
...
     -o options
             Options are specified with a -o flag followed by a comma separat-
             ed string of options.  Available options are as follows:
....
             softdep
                     (FFS only.)  Mount the filesystem using soft dependen-
                     cies.  Instead of metadata being written immediately, it
                     is written in an ordered fashion to keep the on-disk
                     state of the filesystem consistent.  This results in sig-
                     nificant speedups for file create/delete operations.
                     This option will be ignored when using the -u flag and a
                     filesystem is already mounted read/write.  It requires
                     option FFS_SOFTUPDATES to be enabled in the running ker-
                     nel.