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ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.
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Explore the main themes, entities and connections around Ext4. Start with the topic map, then use the sections below for research and deeper semantic analysis.
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file linux ext3 block system filesystem systems bitmap data group windows kernel inode write version new development gpt open disk
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Ext4 | Allowed filename characters | All characters and character sequences permitted, except for NULL ('\0'), '/', and the special file names "." and ".." which are reserved for indicating (respectively) current a… | 1.00 | infobox |
| Ext4 | Attributes | acl, bh, bsddf, commit=nrsec, data=journal, data=ordered, data=writeback, delalloc, extents, journal_dev, mballoc, minixdf, noacl, nobh, nodelalloc, noextents, nomballoc, nombca… | 1.00 | infobox |
| Ext4 | Bad blocks | Table | 1.00 | infobox |
| Ext4 | Copy-on-write | No | 1.00 | infobox |
| Ext4 | Data deduplication | No | 1.00 | infobox |
| Ext4 | Date range | 14 December 1901 – 10 May 2446 | 1.00 | infobox |
| Ext4 | Date resolution | Nanosecond | 1.00 | infobox |
| Ext4 | Dates recorded | Modification (mtime), data or attribute modification (ctime), access (atime), deletion (dtime), creation (crtime) | 1.00 | infobox |
| Ext4 | Developer(s) | Mingming Cao, Andreas Dilger, Alex Zhuravlev (Tomas), Dave Kleikamp, Theodore Ts'o, Eric Sandeen, Sam Naghshineh, others | 1.00 | infobox |
| Ext4 | Directory contents | Linked list, hashed B-tree | 1.00 | infobox |
| Ext4 | File allocation | Extents / Bitmap | 1.00 | infobox |
| Ext4 | File system permissions | Unix permissions, POSIX ACLs | 1.00 | infobox |
| Ext4 | Forks | No | 1.00 | infobox |
| Ext4 | Full name | Fourth extended file system | 1.00 | infobox |
| Ext4 | Introduced | 10 October 2006 with Linux 2.6.19 | 1.00 | infobox |
| Ext4 | Max file size | 16–256 TiB (for 4–64 KiB block size) | 1.00 | infobox |
| Ext4 | Max filename length | 255 bytes (fewer for multibyte character encodings such as Unicode) | 1.00 | infobox |
| Ext4 | Max no. of files | 4 billion (specified at filesystem creation time) | 1.00 | infobox |
| Ext4 | Max volume size | 1 EiB | 1.00 | infobox |
| Ext4 | Partition IDs | .mw-parser-output .monospaced{font-family:monospace,monospace}0x83: MBR / EBR. EBD0A0A2-B9E5-4433-87C0-68B6B72699C7: GPT Windows BDP. 0FC63DAF-8483-4772-8E79-3D69D8477DE4: GPT L… | 1.00 | infobox |
| Ext4 | Preceded by | ext3 | 1.00 | infobox |
| Ext4 | Supported operating systems | Linux | 1.00 | infobox |
| Ext4 | Supported operating systems | FreeBSD (full read/write support since version 12.0) | 1.00 | infobox |
| Ext4 | Supported operating systems | macOS (read-only with ext4fuse, full with ExtFS) | 1.00 | infobox |
| Ext4 | Supported operating systems | Windows (read–write without journaling with ext2fsd) | 1.00 | infobox |
| Ext4 | Supported operating systems | KolibriOS (read-only) | 1.00 | infobox |
| Ext4 | Transparent compression | No | 1.00 | infobox |
| Ext4 | Transparent encryption | Yes | 1.00 | infobox |
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