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Date: Sat, 16 May 2009 02:42:17 -0700 (PDT) From: david@...g.hm To: Theodore Tso <tytso@....edu> cc: Timo Sirainen <tss@....fi>, Josef Bacik <josef@...icpanda.com>, linux-kernel@...r.kernel.org Subject: Re: ext3/ext4 directories don't shrink after deleting lots of files On Fri, 15 May 2009, Theodore Tso wrote: > 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. I see it on a fairly regular basis on mail servers. in sendng a large queue builds up due to a remote system being down, but then after the remote system recovers, all access to that directory is slow, hurting everything else on the system. David Lang -- 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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