Editing Reiser4 (section)

{{short description|Computer file system, successor to ReiserFS}}
{{Multiple issues|
{{Lead too short|date=February 2010}}
{{More citations needed|date=January 2017}}
}}
{{ infobox filesystem
| name                    = Reiser4
| full_name               = Reiser4
| developer               = Edward Shishkin and others<ref>{{Cite web |url=https://reiser4.wiki.kernel.org/index.php/Credits |title=Credits - Reiser4 FS Wiki |website=reiser4.wiki.kernel.org |access-date=2019-08-05}}</ref>
| introduction_os         = [[Linux]]
| OS                      = Linux
| introduction_date       = {{Start date and age|2004}}
| partition_id            =
<code>Apple_UNIX_SVR2</code> ([[Apple Partition Map]])<br />
<code>0x83</code> ([[Master Boot Record|MBR]])<br />
<code>[[Basic data partition]]</code> ([[GUID Partition Table|GPT]])
| directory_struct        = [[dancing tree|Dancing]] [[B*-tree]]
| file_struct             =
| bad_blocks_struct       =
| max_filename_size       = 3976 bytes
| max_files_no            =
| max_volume_size         =
| max_file_size           = 8 [[Tebibyte|TiB]] on x86
| filename_character_set  = All bytes except NUL and '/'
| dates_recorded          = modification (mtime), metadata change (ctime), access (atime)
| date_range              = 64-bit timestamps<ref>Documentation/filesystems/reiser4.txt from a reiser4-patched kernel source, "By default file in reiser4 have 64-bit timestamps."</ref>
| forks_streams           = No
| attributes              =
| file_system_permissions = Unix permissions
| compression             = Yes
| encryption              = No
| single_instance_storage = No
| website = [https://reiser4.wiki.kernel.org/ reiser4.wiki.kernel.org] 
| repo = [https://github.com/edward6/reiser4 github.com/edward6/reiser4]
}}
'''Reiser4''' is a [[computer]] [[file system]], successor to the [[ReiserFS]] file system, developed from scratch by [[Namesys]] and sponsored by [[Defense Advanced Research Projects Agency|DARPA]] as well as [[Linspire]]. Reiser4 was named after its former lead developer [[Hans Reiser]]. {{As of|2021}}, the Reiser4 patch set is still being maintained,<ref name="phLinux5patch">{{Cite web |url=https://www.phoronix.com/scan.php?page=news_item&px=Reiser4-Linux-5.0-Patch |title=Reiser4 Brought To The Linux 5.0 Kernel - Phoronix |last=Larabel |first=Michael |author-link=Michael Larabel |date=2019-04-13 |website=[[Phoronix]] |access-date=2019-08-04}}</ref><ref name=reiser4sourceforge/> but according to [[Phoronix]], it is unlikely to be merged into mainline Linux without corporate backing.<ref>{{Cite web|url=https://phoronix.com/scan.php?page=news_item&px=Linux-4.10-Ten-Missing-Features|title = Ten Features You Will Not Find in the Mainline Linux 4.10 Kernel - Phoronix}}</ref>