[$] Flash storage topics

At the 2018 Linux Storage, Filesystem, and Memory-Management Summit(LSFMM), Jaegeuk Kim described some current issues for flash storage,especially with regard to Android. Kim is the F2FS developer andmaintainer, and the filesystem-track session was ostensibly about thatfilesystem. In the end, though, the talk did not focus on F2FS and insteadranged over a number of problem areas for Android flash storage.