tree 96eaf61ad2db6e61e4b17944aa222c914cb07b49
parent ed76f912777066c788ae7e9cfb1d5e19e8c35274
author Stefan Brüns <stefan.bruens@rwth-aachen.de> 1473627100 +0200
committer Tom Rini <trini@konsulko.com> 1474635356 -0400

fs/fat: Do not write unmodified fat entries to disk

The code caches 6 sectors of the FAT. On FAT traversal, the old contents
needs to be flushed to disk, but only if any FAT entries had been modified.
Explicitly flag the buffer on modification.

Currently, creating a new file traverses the whole FAT up to the first
free cluster and rewrites the on-disk blocks.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>