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From: Eric Blake <ebb9 AT byu DOT net>
Subject:  Re: experimental coreutils-5.94-4
Date: Wed, 1 Mar 2006 17:00:00 +0000 (UTC)
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Eric Blake <ebb9 <at> byu.net> writes:

> Oops - see how the link count changed from 21 to 22 when I had a physical
> backing directory?  find (and any other tool that optimizes a recursive
> search to look at (link count - 2) subdirectories and then quit) might
> get confused by the fact that the number of subdirs given by readdir is
> no longer consistent with the link count.
> 

As an example, with findutils-4.3.0-1 and cygwin built today (oldfind in
the 4.3.0 package uses the algorithm of the find utility in 4.2.27; the
find in 4.3.0 changed algorithms to fts() which avoids the subdir
optimization):

$ cd /usr
$ oldfind . -maxdepth 2 -mindepth 1 -name 'lib*' | wc
     70      70    1435
$ oldfind . -noleaf -maxdepth 2 -mindepth 1 -name 'lib*' | wc
    755     755   16168
$ mkdir /cygdrive/c/cygwin/usr/lib
$ oldfind . -maxdepth 2 -mindepth 1 -name 'lib*' | wc
    755     755   16168

Notice that without a physical /usr/lib under the mount point, oldfind did
not traverse into /usr/lib unless I used -noleaf to disable the link
count optimization, because /usr/lib appeared too late in the readdir.

-- 
Eric Blake



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