The Flash-Friendly File System, known as F2FS, is a log-structured filesystem designed for managed flash devices, especially eMMC chips and SD cards. It was written by Samsung and was merged into mainline Linux in 3.8. It is marked experimental, indicating that it has not been extensively deployed as yet, but it seems that some Android devices are using it.
F2FS takes into account the page and erase block sizes and tries to align data on these boundaries. The log format provides resilience in the face of power down and also provides good write performance, in some tests showing a twofold improvement over ext4. There is a good description of the design of F2FS in the kernel documentation in Documentation/filesystems/f2fs.txt, and there ...
