Hi!
I have a problem in UDF so I thought I'll post it here if someone has a
good idea how to solve it.
UDF does preallocation on directories (on files a well, but that is not a
problem). Now this helps against directory fragmentation but there is an
issue with it: When to drop this preallocation? Currently it is done in
udf_clear_inode() which has two problems:
1) udf_clear_inode() is really called to late to do anything like freeing
space from inode and UDF has to play some nasty tricks (like
explicitely syncing inode, calling invalidate_inode_buffers() once
more) to make everything work. Using udf_drop_inode() would be much
better but that is called under i_lock so it's not really usable
(unless I'd drop i_lock in it but then it would even nastier).
2) When you create lots of directories, they use quite some additional
space for preallocation and there's not really a got way how to get rid
of preallocated blocks than dropping dcache or umount + mount the
filesystem.
So after all I'm thinking whether directory preallocation is really worth
the trouble. But before I go and rip it I'd like to check whether someone
does not have some clever idea :).
Honza
--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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