Editing XFS (section)

=== Second generation XFS ===
A team led by Steve Lord at SGI ported XFS to Linux,<ref>{{cite web | url= http://olstrans.sourceforge.net/release/OLS2000-xfs/OLS2000-xfs.html | title= Porting XFS to Linux | website= Olstrans.SourceForge.net | date= 2000-07-21 | access-date= 2013-04-29 | archive-url= https://web.archive.org/web/20130225112334/http://olstrans.sourceforge.net/release/OLS2000-xfs/OLS2000-xfs.html | archive-date= 2013-02-25 | url-status= live }}</ref> and first support by a [[Linux distribution]] came in 2001. This support gradually became available in almost all Linux distributions.{{citation needed|date=March 2016}}

Initial support for XFS in the Linux kernel came through [[Patch (computing)|patches]] from SGI. It merged into the [[Linux kernel mainline]] for the 2.6 series, and separately merged in February 2004 into the 2.4 series in version 2.4.25,<ref>{{cite web | url= https://www.kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.25 | title= Linux kernel 2.4.25 changelog | website= [[kernel.org]] | date= 2004-02-18 | access-date= 2014-08-14 | archive-url= https://web.archive.org/web/20140819083123/https://www.kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.25 | archive-date= 2014-08-19 | url-status= live }}</ref> making XFS almost universally available on Linux systems.<ref>{{cite web |title= Common threads: Advanced filesystem implementor's guide, Part 9, Introducing XFS |author= Daniel Robbins |work= Developer Works |publisher= IBM |date= January 1, 2002 |url= http://www.ibm.com/developerworks/library/l-fs9/index.html | access-date=November 6, 2011 | url-status= dead | archive-url= https://web.archive.org/web/20150904032700/http://www.ibm.com/developerworks/library/l-fs9/index.html| archive-date= September 4, 2015 }}</ref> [[Gentoo Linux]] became the first [[Linux distribution]] to introduce an option for XFS as the default filesystem in mid-2002.<ref>{{cite web | title = Common threads: Advanced filesystem implementor's guide, Part 10, Deploying XFS | author = Daniel Robbins | work = Developer Works | publisher = IBM | date = April 1, 2002 | url = http://www.ibm.com/developerworks/linux/library/l-fs10/index.html | access-date = November 6, 2011 | archive-url = https://web.archive.org/web/20111224220036/http://www.ibm.com/developerworks/linux/library/l-fs10/index.html | archive-date = December 24, 2011 | url-status = live }}</ref>

[[FreeBSD]] added [[File system permissions|read-only]] support for XFS in December 2005, and in June 2006 introduced experimental write support. However, this was intended only as an aid in migration from Linux, not as a "main" file system. FreeBSD 10 removed support for XFS.<ref name="freebsdremoved">{{cite web | url = http://lists.freebsd.org/pipermail/freebsd-questions/2013-October/254143.html | title = Has FreeBSD 10 Dropped Support For XFS? | website = Lists.freebsd.org | date = 2013-10-27 | access-date = 2014-03-30 | archive-url = https://web.archive.org/web/20140330082123/http://lists.freebsd.org/pipermail/freebsd-questions/2013-October/254143.html | archive-date = 2014-03-30 | url-status = live }}</ref>

In 2009, version 5.4 of 64-bit [[Red Hat Enterprise Linux]] (RHEL) Linux distribution contained the necessary kernel support for the creation and usage of XFS file systems, but lacked the corresponding command-line tools. The tools available from [[CentOS]] could operate for that purpose, and Red Hat also provided them to RHEL customers on request.<ref>{{cite web | title = Bug 521173 -xfsprogs is missing in RHEL-5.4 | date = May 24, 2010 | website = RedHat.com | url = http://bugzilla.redhat.com/show_bug.cgi?id=521173 | access-date = November 6, 2011 | archive-url = https://archive.today/20120710060100/http://bugzilla.redhat.com/show_bug.cgi?id=521173 | archive-date = July 10, 2012 | url-status = live }}</ref> RHEL&nbsp;6.0, released in 2010, includes XFS support for a fee as part of Red Hat's "scalable file system add-on".<ref>{{cite web | title = Red Hat Enterprise Linux Scalable File System Add-On | url = http://ca.redhat.com/products/enterprise-linux-add-ons/file-systems/ | access-date = 2014-05-22 | website = RedHat.com | archive-url = https://web.archive.org/web/20140529025913/http://ca.redhat.com/products/enterprise-linux-add-ons/file-systems/ | archive-date = 2014-05-29 | url-status = live }}</ref> [[Oracle Linux]] 6, released in 2011, also includes an option for using XFS.<ref>{{cite web
 |url          = https://oss.oracle.com/el6/docs/RELEASE-NOTES-GA-en.html
 |title        = Oracle Linux 6 Release Notes
 |date         = February 2011
 |publisher    = Oracle Corporation
 |access-date   = 2013-04-07
 |quote        = Oracle Linux 6 includes many new features, including [...] XFS [:] Oracle Linux 6 includes XFS as an optional filesystem.
 |archive-url  = https://web.archive.org/web/20120328031356/http://oss.oracle.com/el6/docs/RELEASE-NOTES-GA-en.html
 |archive-date = 2012-03-28
 |url-status   = live
}}</ref>

RHEL&nbsp;7.0, released in June 2014, uses XFS as its default file system,<ref>{{cite web
 |url          = http://www.redhat.com/about/news/press-archive/2014/6/red-hat-unveils-rhel-7
 |title        = Red Hat Unveils Red Hat Enterprise Linux 7, Redefining the Enterprise Operating System
 |date         = 2014-06-10
 |access-date   = 2014-06-10
 |publisher    = [[Red Hat]]
 |archive-url  = https://web.archive.org/web/20140613005526/http://www.redhat.com/about/news/press-archive/2014/6/red-hat-unveils-rhel-7
 |archive-date = 2014-06-13
 |url-status   = live
}}</ref> including support for using XFS for the <code>/boot</code> partition, which previously was not practical due to bugs in the [[GRUB]] bootloader.<ref>{{cite web | title = Bug 250843 -grub-install hangs on xfs | date = May 4, 2009 | website = Redhat.com | url = http://bugzilla.redhat.com/show_bug.cgi?id=250843 | access-date = November 6, 2011 | archive-url = https://archive.today/20120710160608/http://bugzilla.redhat.com/show_bug.cgi?id=250843 | archive-date = July 10, 2012 | url-status = live }}</ref>

Linux kernel 4.8 in August 2016 added a new feature, "reverse mapping". This is the foundation for a large set of planned features: [[Snapshot (computer storage)|snapshots]], [[copy-on-write]] (COW) data, [[data deduplication]], reflink copies, online data and metadata [[Data scrubbing|scrubbing]], highly accurate reporting of data loss or bad sectors, and significantly improved reconstruction of damaged or corrupted filesystems. This work required changes to XFS's on-disk format.<ref>{{cite web|url=https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0cbbc422d56668528f6efd1234fe908010284082|title=kernel/git/torvalds/linux.git - Linux kernel source tree|website=git.kernel.org}}</ref><ref>{{Cite web |url=https://kernelnewbies.org/Linux_4.8#XFS_reverse_mapping |title=Linux_4.8 - Linux Kernel Newbies |access-date=2018-10-19 |archive-url=https://web.archive.org/web/20181019164144/https://kernelnewbies.org/Linux_4.8#XFS_reverse_mapping |archive-date=2018-10-19 |url-status=live }}</ref>