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Re: reading an empty directory after reboot is very slow



On Tue, Apr 14, 2015 at 03:15:02PM +0200, Vincent Lefevre wrote:
> On 2015-04-14 12:15:03 +0300, Reco wrote:
> > On Tue, Apr 14, 2015 at 09:22:15AM +0200, Petter Adsen wrote:
> > > On Tue, 14 Apr 2015 10:12:28 +0300
> > > Reco <recoverym4n@gmail.com> wrote:
> > > > On Tue, Apr 14, 2015 at 08:58:20AM +0200, Petter Adsen wrote:
> > > > Removing files from the directory does not change directory's inode
> > > > size. If using ext4, at least.
> > > 
> > > Interesting. Also good to know. Thank you :)
> > > 
> > > But if you create new files in that directory after deleting them, I
> > > expect the inodes get reallocated?
> > 
> > Yes, they should.
> > 
> > 
> > > Is this specific to Linux/ext4?
> > 
> > No. I'm not sure about vxfs, btrfs and zfs (or rather - lazy to check
> > it), but for ext family, ufs and jfs2 - it works all the same.
> 
> According to comments on
> 
>   http://unix.stackexchange.com/questions/38639/how-to-compact-a-directory
> 
> "xfs autoshrinks directories that have had files removed from them."

I did not mention xfs, but it's nice to know, thanks.


> "ufs on the BSDs and Mac HFS both shrink directories on the fly also."

We don't do BSD here. Ufs they put in Solaris does not do this :)

Reco


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