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Date: Fri, 15 May 2009 06:58:15 -0400 From: Theodore Tso <tytso@....edu> To: Timo Sirainen <tss@....fi> Cc: Josef Bacik <josef@...icpanda.com>, linux-kernel@...r.kernel.org Subject: Re: ext3/ext4 directories don't shrink after deleting lots of files On Thu, May 14, 2009 at 08:45:38PM -0400, Timo Sirainen wrote: > > I was rather thinking something that I could run while the system was > fully operational. Otherwise just moving the files to a temp directory + > rmdir() + rename() would have been fine too. > > I just tested that xfs, jfs and reiserfs all shrink the directories > immediately. Is it more difficult to implement for ext* or has no one > else found this to be a problem? It's probably fairest to say no one has thought it worth the effort. It would require some fancy games to swap out block locations in the extent trees (life would be easier with non-extent-using inodes), and in the case of htree, we would have to keep track of the index block so we could remove it from the htree index. So it's all doable, if a bit tricky in terms of the technical details; it's just that the people who could do it have been busy enough with other things. It's hasn't been considered high priority because most of the time directories don't go from holding thousands of files down to a small handful. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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