From owner-freebsd-hackers@FreeBSD.ORG  Sun Feb  6 19:45:54 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 035E516A4CF
	for <freebsd-hackers@freebsd.org>;
	Sun,  6 Feb 2005 19:45:54 +0000 (GMT)
Received: from web40902.mail.yahoo.com (web40902.mail.yahoo.com
	[66.218.78.199])	by mx1.FreeBSD.org (Postfix) with SMTP id A5EBC43D39
	for <freebsd-hackers@freebsd.org>;
	Sun,  6 Feb 2005 19:45:53 +0000 (GMT)
	(envelope-from yanyu_1997@yahoo.com)
Received: (qmail 33197 invoked by uid 60001); 6 Feb 2005 19:45:53 -0000
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
	s=s1024; d=yahoo.com;
	b=Be5adDbqeFj9rZu7M6xAmCPvAbrYtQEm6y4RC8xO7syEEh0Dj+iAmaJKczg+31n66eEQiXz60InXxYm04KN9QKiheITxwQgB0vZ20DCjIFlzw7+3eO68OI2iC1gbQZdKJVKazm9CpXQbW/XUT2H9efBE2cpI6a50crODFIplRh0=
	;
Message-ID: <20050206194553.33195.qmail@web40902.mail.yahoo.com>
Received: from [24.127.104.185] by web40902.mail.yahoo.com via HTTP;
	Sun, 06 Feb 2005 11:45:53 PST
Date: Sun, 6 Feb 2005 11:45:53 -0800 (PST)
From: Yan Yu <yanyu_1997@yahoo.com>
To: Robert Watson <rwatson@freebsd.org>, Yan Yu <yanyu@CS.UCLA.EDU>
In-Reply-To: <Pine.NEB.3.96L.1050206124427.55544A-100000@fledge.watson.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Mailman-Approved-At: Mon, 07 Feb 2005 13:26:22 +0000
cc: freebsd-hackers@freebsd.org
Subject: Re: falloc()
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 06 Feb 2005 19:45:54 -0000

hi, THANKS FOR the pointer! 

> falloc() isn't considered a "pluggable" kernel API,
> that is to say, we've
> not engineered FreeBSD with the intent that it be
> replaced at run-time. 
 
> If you don't mind my asking, what motivates you to
> replace falloc()?

i would like to add more checks (e.g., resource usage
restrictions) before a file is being created, e.g.,
the upper limit of the total number of file
descriptors that can be created by a single user (the
same uid). 
THe reason I did not replace fopen() is that: 
there are many places (besides fopen) will create a
new file (vnode). a quick checked shows that _falloc_
is called by many places.. 
does this make sense, or i should make change in some
other place?

THanks!
yan

  




		
__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - Helps protect you from nasty viruses. 
http://promotions.yahoo.com/new_mail