hesela.devUBI File System (UBIFS)
UBIFS is a Linux flash filesystem that stores files on UBI volumes, with an on-flash index and journal recovery while delegating wear and bad-block management to UBI.
The stack is UBIFS over UBI over MTD. Unlike JFFS2's direct MTD use, UBIFS consumes UBI volumes; it is not a filesystem to mount directly on a normal SSD block device. [1]
An on-flash index avoids rebuilding the entire filesystem index by scanning all its contents at mount. UBIFS also supports write-back, compression and journal replay after an unclean shutdown. Filesystem recovery and recovery of unreadable physical data are different responsibilities. [1] [2]
Integrity checks depend on configuration. The Linux v6.16 documentation lists no_chk_data_crc as the default: skipping CRC checks on file-data nodes can leave file-content corruption unnoticed. chk_data_crc enables those checks. Neither option promises to reconstruct damaged data. [1]
For an embedded-system report, record the UBI volume, filesystem mount options and underlying MTD device separately so a filesystem symptom is not mistaken for a physical-block diagnosis. This is an operational inference from the layer boundaries. [2]
UBIFSec was a research extension, not another name for stock UBIFS. Its 2012 secure-deletion protocol combined atomic replacement of key-storage blocks with erasure flushing and key-state recovery. Cite that protocol separately from ordinary filesystem replay or data-node CRC checks. [3]
Relations
- related
- Unsorted Block Images (UBI), NAND flash, Bad block management, NAND erase block, Atomic LEB change (UBI)
Citations
- Linux v6.16, UBI File System: architecture, recovery and mount options
- Linux kernel, UBIFS Authentication Support: MTD, UBI and UBIFS
- Reardon, Capkun and Basin, Data Node Encrypted File System: Efficient Secure Deletion for Flash Memory, USENIX Security 2012, sections 2 and 4.2
Sources & caveats
- The mount-option statement is pinned to Linux v6.16 documentation; check the deployed kernel and effective mount options. No power-loss or corruption test was performed.