Features
JFFS2 introduced:
- Support for NAND flash devices. This involved a considerable amount of work as NAND devices have a sequential I/O interface and cannot be memory-mapped for reading.
- Hard links. This was not possible in JFFS because of limitations in the on-disk format.
- Compression. Four algorithms are available: zlib, rubin, rtime, and lzo.
- Better performance. JFFS treated the disk as a purely circular log. This generated a great deal of unnecessary I/O. The garbage collection algorithm in JFFS2 makes this mostly unnecessary.
Read more about this topic: JFFS2
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—Marcel Proust (1871–1922)
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—Robert Frost (1874–1963)