June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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UBIFS
UBIFS uses a UBI volume to create a robust filesystem. It adds sub-allocation and garbage collection to create a complete flash translation layer. Unlike JFFS2 and YAFFS2, it stores index information on-chip, and so mounting is fast, although don't forget that attaching the UBI volume beforehand may take a significant amount of time. It also allows write-back caching as in a normal disk filesystem, which means that writes are much faster, but with the usual problem of potential loss of data that has not been flushed from the cache to flash memory in the event of power down. You can resolve the problem by making careful use of the fsync(2) and fdatasync(2) functions to force a flush of file data at crucial points.
UBIFS has a journal ...
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