USENIX 2005 Annual Technical Conference, General Track Abstract
Pp. 89104 of the Proceedings
A Transactional Flash File System for Microcontrollers
Eran Gal and Sivan Toledo, Tel-Aviv University
We present a transactional file system for flash memory devices. The
file system is designed for embedded microcontrollers that use an
on-chip or on-board NOR flash device as a persistent file
store. The file system provides atomicity to arbitrary sequences of
file system operations, including reads, writes, file creation and
deletion, and so on. The file system supports multiple concurrent
transactions. Thanks to a sophisticated data structure, the file system
is efficient in terms of read/write-operation counts, flash-storage
overhead, and RAM usage. In fact, the file system typically
uses several hundreds bytes of RAM (often less than 200)
and a bounded stack (or no stack), allowing it to be used on many
16-bit microcontrollers. Flash devices wear out; each block can only
be erased a certain number of times. The file system manages the wear
of blocks to avoid early wearing out of frequently-used blocks.
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