tree fee0aff001a5d5226518f0b67232f083f0931209
parent 40346005166329bc4b53e0c564aff3968c1ddaa0
author Jan Kara <jack@suse.cz> 1237224457 +0100
committer Jan Kara <jack@suse.cz> 1238672188 +0200

udf: Don't write integrity descriptor too often

We update information in logical volume integrity descriptor after each
allocation (as LVID contains free space, number of directories and files on
disk etc.). If the filesystem is on some phase change media, this leads to its
quick degradation as such media is able to handle only 10000 overwrites or so.
We solve the problem by writing new information into LVID only on umount,
remount-ro and sync. This solves the problem at the price of longer media
inconsistency (previously media became consistent after pdflush flushed dirty
LVID buffer) but that should be acceptable.

Report by and patch written in cooperation with
Rich Coe <Richard.Coe@med.ge.com>.

Signed-off-by: Jan Kara <jack@suse.cz>