Editing ReiserFS (section)

{{Short description|Journaling file system}}
{{Distinguish|ReFS}}
{{About|ReiserFS version 3|version 4|Reiser4}}

{{Infobox file system
| name = ReiserFS 3.6
| full_name = ReiserFS
| developer = [[Namesys]]
| introduction_os = [[Linux]] 2.4.1
| introduction_date = {{Start date and age|2001}}
| OS = Linux, [[ReactOS]]
| partition_id = {{indented plainlist|
* {{mono|Apple_UNIX_SVR2}} ([[Apple Partition Map]])
* {{mono|0x83}} ([[Master boot record|MBR]])
* {{mono|[[Microsoft basic data partition|EBD0A0A2-B9E5-4433-87C0-68B6B72699C7]]}} ([[GUID Partition Table|GPT]])
}}
| directory_struct = [[B+ tree]]
| file_struct = [[bit array|Bitmap]]<ref>{{citation | url = http://namesys.com/X0reiserfs.html#nodelayout | publisher = Namesys | title = Reiser FS node layout | url-status = dead | archive-url = https://web.archive.org/web/20060614084322/http://www.namesys.com/X0reiserfs.html#nodelayout | archive-date = 2006-06-14 }}</ref>
| bad_blocks_struct = 
| max_filename_size = 4032 bytes, limited to 255 by Linux VFS
| max_files_no = 2<sup>32</sup>−3 (~4 billion)<ref name="specs">{{citation | chapter-url = http://namesys.com/faq.html#reiserfsspecs | publisher = Namesys | title = FAQ | chapter = Reiser FS Specifications | url-status = dead | archive-url = https://web.archive.org/web/20060705190506/http://www.namesys.com/faq.html#reiserfsspecs | archive-date = 2006-07-05 }}</ref>
| max_volume_size = 16 [[tebibyte|TiB]]<ref name = "specs" />
| max_file_size = 1 [[exbibyte|EiB]] (8 [[tebibyte|TiB]] on 32 bit systems)<ref name = "specs" />
| filename_character_set = All bytes except [[Null character|NUL]] and {{mono|'/'}}
| dates_recorded = Modification (mtime), metadata change (ctime), access (atime)
| date_range = December 14, 1901 – January 18, 2038 (32-bit Unix time)
| date_resolution = 1 s
| forks_streams = Extended attributes
| attributes = 
| file_system_permissions = Unix permissions, [[Access control list|ACLs]] and arbitrary security attributes
| compression = No
| encryption = No
}}

'''ReiserFS''' is a general-purpose, [[journaling file system]] initially designed and implemented by a team at [[Namesys]] led by [[Hans Reiser]] and licensed under [[GPLv2]]. Introduced in version 2.4.1 of the [[Linux kernel]], it was the first journaling file system to be included in the standard kernel. ReiserFS was the default file system in [[Novell]]'s SUSE Linux Enterprise until Novell decided to move to [[ext3]] for future releases on October 12, 2006.<ref>{{cite news | first = Stephen |last=Shankland |title=Novell makes file storage software shift |url=http://www.cnet.com/news/novell-makes-file-storage-software-shift/ |work=Business Tech |publisher=cnet |date= 2006-10-16}}.</ref>

ReiserFS version 3.6, now occasionally referred to as Reiser3, introduced a new on-disk format allowing larger filesizes. Namesys considered ReiserFS stable and feature-complete and ceased development on it to concentrate on its successor, [[Reiser4]], though it continued to release security updates and critical bug fixes. Namesys went out of business in 2008 after Reiser's conviction for murder. The product is now maintained as open source by volunteers.<ref>{{cite web | url=http://www.cnet.com/news/namesys-vanishes-but-reiser-project-lives-on/ | archive-url=https://web.archive.org/web/20160327005558/http://www.cnet.com/news/namesys-vanishes-but-reiser-project-lives-on/ | url-status=dead | archive-date=March 27, 2016 | title=Namesys vanishes, but Reiser project lives on | work=CNet | date=January 16, 2008 | access-date=2008-01-26 |first = Stephen | last = Shankland}}</ref> The reiserfsprogs 3.6.27 were released on 25 July 2017.<ref>{{cite web | url=https://fossies.org/linux/reiserfsprogs/ChangeLog | title="Fossies" - the Fresh Open Source Software Archive | date=July 25, 2017 | access-date=2019-07-25 }}</ref>

As of [[Linux]] 6.12, ReiserFS is supported on Linux without quota support. Due to technical issues inherent to the file system and lack of maintenance, the Linux community had been discussing removal of ReiserFS from mainline since at least early 2022. ReiserFS was removed from the Linux kernel in version 6.13.<ref name=":0">{{Cite web |title=Merge tag 'reiserfs_delete' |url=https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c01f664e4ca210823b7594b50669bbd9b0a3c3b0 |access-date=2024-11-24 |website=git.kernel.org}}</ref><ref name=":1">{{Cite web |last=Larabel |first=Michael |date=2024-11-21 |title=ReiserFS Has Been Deleted From The Linux Kernel |url=https://www.phoronix.com/news/ReiserFS-Deleted-Linux-6.13 |access-date=2024-11-24 |website=www.phoronix.com |language=en}}</ref>