X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:reply-to:subject:to:references:from:message-id
	:date:mime-version:in-reply-to:content-type
	:content-transfer-encoding; q=dns; s=default; b=sXzx40Ke9I2tQLAm
	eoP2Sdf2iLheE1K5sCJyskDcMNCC3J+35eMjQqMhMHlBX4vaE/hVaAsl2dDWhl14
	EbApVRCt1siQFJcJshLksK7B2sQCyP2S72rhDYKo6t5ZStxt69UruDSPJwbDFNGZ
	qzVrgDOsRF9umoy8iME/PpxfiRM=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:reply-to:subject:to:references:from:message-id
	:date:mime-version:in-reply-to:content-type
	:content-transfer-encoding; s=default; bh=iY89erBtmfV7GMlQ0p3DLf
	rl22s=; b=kIWBs9s7OebzH/zHiYH/wQbIMaG+uYMDSQLY7F2724G4Qn18mt1Vd5
	id5EX65KpqWfLN2Z6uTXnWy+NnpzWe+Kc1TThVD2sKdMgQt0dvTDLOt99La+lLVc
	6iCYlSPzQReSyhgAkpbQxclYOhkd+bIQ7fVbJwCZCOvQILmO5IM/A=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Spam-SWARE-Status:	No, score=-0.5 required=5.0 tests=AWL,BAYES_05,KAM_LAZY_DOMAIN_SECURITY,RCVD_IN_DNSWL_LOW autolearn=no version=3.3.2 spammy=Repin, Hx-spam-relays-external:shaw.ca, H*r:shaw.ca, andrey
X-HELO:	smtp-out-so.shaw.ca
Reply-To:	Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject:	Re: RFE: find <path> -d -size 0 => doesn't find empty directories
To:	cygwin AT cygwin DOT com
References:	<5BDA347D DOT 8070909 AT tlinx DOT org> <1792215646 DOT 20181101191249 AT yandex DOT ru>
From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Openpgp:	preference=signencrypt
Message-ID:	<787c5490-d4a8-46e1-20d6-e7fc9a1f5db8@SystematicSw.ab.ca>
Date:	Thu, 1 Nov 2018 23:05:08 -0600
User-Agent:	Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1
MIME-Version:	1.0
In-Reply-To:	<1792215646.20181101191249@yandex.ru>
X-IsSubscribed:	yes

On 2018-11-01 10:12, Andrey Repin wrote:
> L A Walsh wrote:
>> Unfortunately, due to directories really not being in the user
>> disk data space, but in the MFT(zone) (I think), the size
>> comes back as zero ('0') for directories.

>> Would it be possible (if not problematic) for the cygwin
>> emulation layer to return some non-zero value if the
>> directory has actual entries in it (ignoring structural
>> values like "." and "..")?  Maybe return as 'size' either
>> a dummy number proportional to #entries (like 10*#entries),
>> or something like summing up actual number (+1) of characters
>> in the file list?

>> Would that be difficult to do, or add?

> Having something to this extent would be useful in case of searching for
> directories with too many files, for example.

> I'd vote for something like (entries << 7), which is closer to an average ext2
> counter. No need to ignore anything.

I believe readdir(3) overhead is already high, and adding extraneous lookups to
add metadata which is not readily available under NTFS/exFAT would slow it even
further.
Do you really want readdir(3) or stat(3) to recurse to sum the entry sizes for
each subdirectory?
Some of us have some large messy directories more reminiscent of Unix systems
than typical of Windows systems.

$ time du -sh /tmp/
91M     /tmp/

real    0m5.125s
user    0m0.125s
sys     0m1.077s
$ time du -sh /var/log/
496M    /var/log/

real    0m42.725s
user    0m0.687s
sys     0m9.139s

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -