more storage fixes for problems related to sparse files support
more storage fixes for problems related to sparse files support

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@1215 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent