Editing Soft updates (section)

== Implementations ==

[[FreeBSD]] supports soft updates for the [[Unix File System|UFS]] file system<ref>{{cite book
| title=The Design and Implementation of the FreeBSD Operating System
| first1=Marshall Kirk
| last1=McKusick
| first2=George V.
| last2=Neville-Neil
| date=2005
| chapter=8.6
| publisher=[[Addison-Wesley]]
| isbn=978-0321968975}}</ref> and they have been enabled by default during installation for many years.  Soft updates are manually enabled or disabled during file system creation with an option to the <kbd>newfs</kbd> command.<ref>{{cite web
| url=https://www.freebsd.org/cgi/man.cgi?query=newfs
| title=newfs(8)
| publisher=[[FreeBSD]]
| date=2017-07-07
| access-date=2019-02-02}}</ref>  They can be disabled or enabled anytime thereafter with an option to the <kbd>tunefs</kbd> command.<ref>{{cite web
| url=https://www.freebsd.org/cgi/man.cgi?query=tunefs
| title=tunefs(8)
| publisher=FreeBSD
| date=2016-04-19
| access-date=2019-02-02}}</ref>  FreeBSD 9.0 introduced a journaling supplement to soft updates for the purpose of eliminating a background <kbd>fsck</kbd> for garbage collection after a crash.<ref>{{cite web
| url=https://www.freebsd.org/releases/9.0R/relnotes-detailed.html#FS
| title=FreeBSD 9.0-RELEASE Release Notes
| publisher=FreeBSD
| date=2012-01-12
| access-date=2019-02-02}}</ref><ref>{{cite web
| url=https://www.mckusick.com/softdep/suj.pdf
| title=Journaled Soft-updates
| first1=Marshall Kirk
| last1=McKusick
| first2=Jeff
| last2=Roberson
| date=2010-01-23
| access-date=2019-02-02}}</ref> However, enabling journaling on a file system with soft updates disables the ability to make file system snapshots.<ref>{{cite web
| url=https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195485
| title=Bug 195485 - [ufs] mksnap_ffs(8) cannot create snapshot with journaled soft updates enabled 
| publisher=FreeBSD
| date=2014-11-28
| access-date=2019-02-02}}</ref> This may cause issues when file systems are dumped with the -L option, as snapshots are used to guarantee file system coherency during the dump.

[[OpenBSD]] supported soft updates for the FFS file system until the release 7.4 (2023), at which time it was disabled. <ref>{{cite web
| url=https://undeadly.org/cgi?action=article;sid=20230706044554
| title=Soft updates disabled for future VFS work
| publisher=[[OpenBSD_Journal]]
| date=2023-07-05
| access-date=2024-03-09}}</ref>

[[NetBSD]] supported soft updates until the 6.0 release (2012) at which time it was deprecated in favor of [[WAPBL]] journaling.<ref>{{cite web
| url= //www.netbsd.org/releases/formal-6/NetBSD-6.0.html#removals
| title=Announcing NetBSD 6.0
| publisher=[[NetBSD]]
| date=2012-10-17
| access-date=2019-02-02}}</ref>