Messages in this thread | | | Date | Sun, 24 Feb 2008 20:02:07 +0100 | From | Pavel Machek <> | Subject | Re: jffs2: -ENOSPC when truncating file?! |
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On Sun 2008-02-24 18:57:32, David Woodhouse wrote: > > On Sun, 2008-02-24 at 07:57 +0100, Jörn Engel wrote: > > Could a na??ve implementation of this get exploited by doing a large > > number of truncates that just shave single bytes off various files? > > Yeah, which is why _my_ na??ve implementation would do it for > truncate-to-zero instead of just _any_ truncate (which could even be > truncate-to-larger). > > A more complex version might allow _any_ transaction to eat into the > ALLOC_DELETION pool if it is ultimately going to reduce the amount of > space taken on the file system -- even overwriting 'real' data with > zeroes which compress better. That's going to be hard to calculate in > the general case though. > > If allowing only truncate-to-zero isn't good enough, perhaps we could > allow truncation to use the ALLOC_DELETION pool when it's going to > obsolete at least one full data node. That's not so hard to check.
I believe truncate-to-zero is good enough.
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