ext4

E37465

Linux file system file system journaling file system

ext4 is a widely used, journaling fourth-generation extended file system for Linux, designed for improved performance, reliability, and support for large volumes and files.

Aliases (1)

Fourth Extended File System ×1

Statements (50)

Predicate	Object
instanceOf	Linux file system → file system → journaling file system →
backwardCompatibleWith	ext2 → ext3 →
defaultFileSystemOn	many Linux distributions →
designGoal	improved performance → improved reliability → support for large files → support for large volumes →
developer	The Linux community →
fullName	Fourth Extended File System →
initialMainlineReleaseYear	2008 →
introducedInLinuxKernelVersion	2.6.28 →
license	GPL-compatible (as part of the Linux kernel) →
maxFileSize	16 TiB (with 4 KiB block size, typical configuration) →
maxFileSystemSize	1 EiB (theoretical design limit) →
operatingSystem	Linux →
predecessor	ext3 →
supports64bitBlockNumbers	true →
supportsACLs	true →
supportsBarriers	true →
supportsCaseSensitiveFilenames	true →
supportsDelayedAllocation	true →
supportsDirectoryIndexing	true →
supportsDiscardTRIM	true →
supportsEncryption	true →
supportsExtentBasedAllocation	true →
supportsExtentsForFiles	true →
supportsFastFsck	true →
supportsFlexibleBlockGroups	true →
supportsHardLinks	true →
supportsHugeFiles	true →
supportsJournalChecksumming	true →
supportsJournalInFile	true →
supportsJournaling	true →
supportsMetadataChecksums	true →
supportsMultiblockAllocation	true →
supportsNanosecondTimestamps	true →
supportsOnlineDefragmentation	true →
supportsPersistentPreallocation	true →
supportsPOSIXPermissions	true →
supportsProjectQuotas	true →
supportsQuota	true →
supportsResizeOffline	true →
supportsResizeOnline	true →
supportsSparseFiles	true →
supportsSubdirectoryScalability	true →
supportsSymbolicLinks	true →
supportsUninitializedBlockGroups	true →

Referenced by (4)

Subject (surface form when different)	Predicate
Linux → Linux/m68k →	supportsFileSystem
ext4 ("Fourth Extended File System") →	fullName
openSUSE →	supports