CONFIG_EROFS_FS: EROFS filesystem support

General informations

The Linux kernel configuration item CONFIG_EROFS_FS has multiple definitions:

EROFS filesystem support found in fs/erofs/Kconfig

The configuration item CONFIG_EROFS_FS:

• prompt: EROFS filesystem support
• type: tristate
• depends on: CONFIG_BLOCK
• defined in fs/erofs/Kconfig
• found in Linux kernels: 5.4–5.19, 6.0–6.12, 6.13-rc+HEAD
• modules built: erofs, erofs

Help text

EROFS (Enhanced Read-Only File System) is a lightweight read-only file system with modern designs (e.g. no buffer heads, inline xattrs/data, chunk-based deduplication, multiple devices, etc.) for scenarios which need high-performance read-only solutions, e.g. smartphones with Android OS, LiveCDs and high-density hosts with numerous containers;

It also provides fixed-sized output compression support in order to improve storage density as well as keep relatively higher compression ratios and implements in-place decompression to reuse the file page for compressed data temporarily with proper strategies, which is quite useful to ensure guaranteed end-to-end runtime decompression performance under extremely memory pressure without extra cost.

See the documentation at Documentation/filesystems/erofs.rst and the web pages at https://erofs.docs.kernel.org for more details.

If unsure, say N.

EROFS filesystem support found in drivers/staging/erofs/Kconfig

The configuration item CONFIG_EROFS_FS:

• prompt: EROFS filesystem support
• type: tristate
• depends on: CONFIG_BLOCK
• defined in drivers/staging/erofs/Kconfig
• found in Linux kernels: 4.19–4.20, 5.0–5.3
• modules built: erofs, erofs

Help text

EROFS(Enhanced Read-Only File System) is a lightweight read-only file system with modern designs (eg. page-sized blocks, inline xattrs/data, etc.) for scenarios which need high-performance read-only requirements, eg. firmwares in mobile phone or LIVECDs.

It also provides VLE compression support, focusing on random read improvements, keeping relatively lower compression ratios, which is useful for high-performance devices with limited memory and ROM space.

If unsure, say N.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb fs "erofs" : CONFIG_EROFS_FS : fs/erofs/super.c # in 5.4–5.19, 6.0–6.12, 6.13-rc+HEAD
• lkddb fs "erofs" : CONFIG_EROFS_FS CONFIG_STAGING : drivers/staging/erofs/super.c # in 4.19–4.20, 5.0–5.3
• lkddb fs "pseudo_erofs" : CONFIG_EROFS_FS CONFIG_EROFS_FS_ONDEMAND : fs/erofs/fscache.c # in 6.9–6.12, 6.13-rc+HEAD
• lkddb module erofs CONFIG_EROFS_FS : drivers/staging/erofs/Kconfig : "EROFS filesystem support" # in 4.19–4.20, 5.0–5.3
• lkddb module erofs CONFIG_EROFS_FS : fs/erofs/Kconfig : "EROFS filesystem support" # in 5.4–5.19, 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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