UBI File System (UBIFS) is the Linux kernel’s file system for raw flash memory used through UBI volumes.
Unlike traditional Linux file systems that operate on block devices, UBIFS is built for MTD-based flash storage and the constraints that come with eraseblocks, wear, and bad blocks. It’s a solid choice for embedded Linux systems that need a writable flash-aware file system integrated directly into the kernel.
This is free and open source software.
Key Features
- Designed to work on top of UBI volumes rather than conventional block devices.
- Maintains file system indexing information on flash media, helping it mount much faster than JFFS2.
- Supports write-back operation for better write performance.
- Offers on-the-fly compression, including none, LZO, and zlib options.
- Automatically replays its journal after unclean reboots or power cuts to keep on-flash data structures consistent.
- Provides mount options for bulk reads, CRC checking behaviour, and filesystem authentication settings.
Website: docs.kernel.org/filesystems/ubifs.html
Support:
Developer: The kernel development community
License: GNU General Public License v2.0
UBIFS is written in C. Learn C with our recommended free books and free tutorials.
Related Software
| Journaling File Systems | |
|---|---|
| ext4 | Evolved from ext3 adding many notable features including extents |
| XFS | Designed to maintain high performance with large files and file systems |
| F2FS | Flash file system initially developed by Samsung Electronics |
| Btrfs | Checksumming Copy on Write File system |
| OpenZFS | Advanced file system and volume manager originally developed for Solaris |
| GFS2 | Shared disk file system for Linux computer clusters |
| ext3 | Default file system for many popular Linux distributions |
| JFS | Journaled File System |
| Bcachefs | Advanced file system ejected from the mainline kernel |
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