CONFIG_EXT4_FS: The Extended 4 (ext4) filesystem

General informations

The Linux kernel configuration item CONFIG_EXT4_FS:

• prompt: The Extended 4 (ext4) filesystem
• type: tristate
• depends on: (none)
• defined in fs/ext4/Kconfig
• found in Linux kernels: 2.6.28–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD
• modules built: ext4

Help text

This is the next generation of the ext3 filesystem.

Unlike the change from ext2 filesystem to ext3 filesystem, the on-disk format of ext4 is not forwards compatible with ext3; it is based on extent maps and it supports 48-bit physical block numbers. The ext4 filesystem also supports delayed allocation, persistent preallocation, high resolution time stamps, and a number of other features to improve performance and speed up fsck time. For more information, please see the web pages at http://ext4.wiki.kernel.org.

The ext4 filesystem supports mounting an ext3 filesystem; while there are some performance gains from the delayed allocation and inode table readahead, the best performance gains require enabling ext4 features in the filesystem using tune2fs, or formatting a new filesystem as an ext4 filesystem initially. Without explicit enabling of ext4 features, the on disk filesystem format stays fully backward compatible.

To compile this file system support as a module, choose M here. The module will be called ext4.

If unsure, say N.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb fs "ext2" : CONFIG_EXT4_FS : fs/ext4/super.c # in 2.6.33–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD
• lkddb fs "ext3" : CONFIG_EXT4_FS : fs/ext4/super.c # in 2.6.33–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD
• lkddb fs "ext4" : CONFIG_EXT4_FS : fs/ext4/super.c # in 2.6.28–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD
• lkddb fs "ext4dev" : CONFIG_EXT4_FS : fs/ext4/super.c # in 2.6.28–2.6.31
• lkddb fs "mballoc test" : CONFIG_EXT4_FS : fs/ext4/mballoc.c # in 6.9–6.12, 6.13-rc+HEAD
• lkddb module ext4 CONFIG_EXT4_FS : fs/ext4/Kconfig : "The Extended 4 (ext4) filesystem" # in 2.6.28–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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