Q283827

Also known as fourth extended filesystem

ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.

In the Vinony graph

Vinony's link graph records 241 inbound references to Q283827, and connects out to byte, Microsoft Windows and macOS.

Vinony files it under 2008 software, Disk file systems and File systems supported by the Linux kernel.

Vinony links it to 30 Wikipedia language editions.

Key facts

File system.name: ext4
File system.full_name: Fourth extended file system
File system.developer: Mingming Cao, Andreas Dilger, Alex Zhuravlev (Tomas), Dave Kleikamp, Theodore Ts'o, Eric Sandeen, Sam Naghshineh, others
File system.introduction_os: Linux 2.6.19
File system.introduction_date: 10 October 2006
File system.preceded_by: ext3
File system.partition_id: MBR / EBR. GPT Windows BDP. GPT Linux filesystem data. GPT /home partition. GPT /srv (server data) partition.
File system.directory_struct: Linked list, hashed B-tree
File system.file_struct: Extents / Bitmap
File system.bad_blocks_struct: Table
File system.max_filename_size: 255 bytes (fewer for multibyte character encodings such as Unicode)
File system.max_files_no: 4 billion (specified at filesystem creation time)
File system.max_volume_size: 1 EiB
File system.max_file_size: 16–256 TiB (for 4–64 KiB block size)
File system.filename_character_set: All characters and character sequences permitted, except for NULL ('\0'), '/', and the special file names "." and ".." which are reserved for indicating (respectively) current and parent directories.
File system.dates_recorded: Modification (mtime), data or attribute modification (ctime), access (atime), deletion (dtime), creation (crtime)
File system.date_range: 14 December 1901 – 10 May 2446
File system.date_resolution: Nanosecond

via Wikipedia infobox

Wikidata facts

Show 3 more facts

Stack Exchange tag: stackoverflow.com/tags/ext4
publication date: 2008-10-21
maximum size or capacity: 16

Sources (1)

wikidata.org

via Wikidata · CC0

~19 min read

Encyclopedic overview

16 sections

Contents

Adoption
Features
Limitations
Delayed allocation and potential data loss
Implementation
Interoperability
General Architecture
Superblock
Group Descriptor Table
Block Bitmap
Inode Bitmap
Block Group Descriptors
Flexible block groups
See also
References
External links

ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.

ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. However, other Linux kernel developers opposed accepting extensions to ext3 for stability reasons, and proposed to fork the source code of ext3, rename it as ext4, and perform all the development there, without affecting existing ext3 users. This proposal was accepted, and on 28 June 2006, Theodore Ts'o, the ext3 maintainer, announced the new plan of development for ext4.

Excerpted from Wikipedia’s “Q283827” article, available under the CC BY-SA 4.0 licence.