Jörn Engel announced LogFS, "a scalable flash filesystem." The project's home page notes that LogFS aims to be the successor of JFFS2, "the two main problems of JFFS2 are memory consumption and mount time. Unlike most filesystems, there is no tree structure of any sorts on the medium, so the complete medium needs to be scanned at mount time and a tree structure kept in-memory while the filesystem is mounted. With bigger devices, both mount time and memory consumption increase linearly. JFFS2 has recently gained summary support, which helps reduce mount time by a constant factor. Linear scalability remains. YAFFS also appears to be better by a constant factor, yet still scales linearly."
In contrast, Jörn compared his new LogFS, "LogFS has an on-medium tree, fairly similar to Ext2 in structure, so mount times are O(1). In absolute terms, the OLPC system has mount times of ~3.3s for JFFS2 and ~60ms for LogFS." Regarding its stability, he noted, "LogFS works and survives my testcases. It has fairly good chances of not eating your data during regular operation. There are still two known bugs that will eat data if the filesystem is uncleanly unmounted. Also still missing is wear leveling." Thomas Gleixner reviewed the code and offered the following summary, suggesting the code has a ways to go before it replaces JFFS2, "the code is far from being useful on real world hardware. The error handling via BUG() is just making it useless. Also please fix the coding style and other issues from the seperate review. Some useful comments would make a functional review way easier."