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From: Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>
To: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
Cc: Konstantin Khlebnikov
	<khlebnikov-XoJtRXgx1JseBXzfvpsJ4g@public.gmane.org>,
	Li Xi <pkuelelixi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	tytso-3s7WtUTddSA@public.gmane.org,
	adilger-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org,
	viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
	hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
	dmonakhov-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org
Subject: Re: [v8 4/5] ext4: adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface support
Date: Fri, 23 Jan 2015 12:39:32 +1100	[thread overview]
Message-ID: <20150123013932.GC24722@dastard> (raw)
In-Reply-To: <20150122155900.GB3062-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>

On Thu, Jan 22, 2015 at 04:59:00PM +0100, Jan Kara wrote:
> On Thu 22-01-15 18:20:15, Konstantin Khlebnikov wrote:
> > Also: is quota for project-id '0' really required for something?
> > It adds overhead but I don't see any use-cases for that.
>   But only if filesystem has project quota feature enabled, no? That
> doesn't concern me too much since the overhead doesn't seem to big and when
> you enable project quotas you likely want to use them ;-). But if you are
> concerned, I'm not strictly opposed to special casing of project id 0. But
> I'd like to see how much speed you gain by that before complicating the
> code...

Except that doing so will result in different behaviour between
filesystems. XFS always *accounts* inodes when quotas are enabled,
but does not allow limits to be placed on quota ID 0.  Hence projid
= 0 accounts all the space not used by other project groups so
admins can easily see how much uncontrolled space is being used.
I've had admins tell me this is one of the features they liked most
about using project quotas because you can't hide from it, even as
root....

Cheers,

Dave.
-- 
Dave Chinner
david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org

  parent reply	other threads:[~2015-01-23  1:39 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-09  5:22 [v8 0/5] ext4: add project quota support Li Xi
2014-12-09  5:22 ` [v8 1/5] vfs: adds general codes to enforces project quota limits Li Xi
2014-12-09  5:22 ` [v8 2/5] ext4: adds project ID support Li Xi
2015-01-07 23:11   ` Andreas Dilger
2015-01-08  8:51     ` Jan Kara
2015-01-15  7:52     ` Li Xi
     [not found]   ` <1418102548-5469-3-git-send-email-lixi-LfVdkaOWEx8@public.gmane.org>
2015-01-08  8:26     ` Jan Kara
2015-01-08 22:20       ` Andreas Dilger
2015-01-09  9:47         ` Jan Kara
     [not found]           ` <20150109094758.GA2576-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2015-01-09 23:46             ` Dave Chinner
2015-01-12 17:01               ` Jan Kara
2014-12-09  5:22 ` [v8 3/5] ext4: adds project quota support Li Xi
2015-01-06 20:01   ` Andreas Dilger
2015-01-06 21:52     ` Jan Kara
2014-12-09  5:22 ` [v8 4/5] ext4: adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface support Li Xi
2014-12-09 22:57   ` Dave Chinner
2015-01-22 15:20     ` Konstantin Khlebnikov
2015-01-22 15:59       ` Jan Kara
2015-01-22 18:35         ` Konstantin Khlebnikov
     [not found]         ` <20150122155900.GB3062-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2015-01-23  1:39           ` Dave Chinner [this message]
2015-01-22 15:28   ` Konstantin Khlebnikov
     [not found]     ` <54C11733.7080801-XoJtRXgx1JseBXzfvpsJ4g@public.gmane.org>
2015-01-23  1:53       ` Dave Chinner
2015-01-23 11:58         ` Konstantin Khlebnikov
2015-01-23 23:30           ` Dave Chinner
2015-01-23 23:59             ` Andy Lutomirski
     [not found]               ` <CALCETrXPCrOTrkoAMuW2os=z6anaEfv4F4D2yDxo6VtCuEtRZw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-27  8:02                 ` Dave Chinner
2015-01-27 10:45                   ` Konstantin Khlebnikov
2015-01-28  0:37                     ` Dave Chinner
2015-02-04 15:22                       ` Konstantin Khlebnikov
     [not found]                         ` <20150204225844.GA12722@dastard>
2015-02-05  9:32                           ` Konstantin Khlebnikov
2015-02-05 16:38                           ` Jan Kara
2015-02-05 21:05                             ` Dave Chinner
2015-01-28  0:45                   ` Andy Lutomirski
     [not found] ` <1418102548-5469-1-git-send-email-lixi-LfVdkaOWEx8@public.gmane.org>
2014-12-09  5:22   ` [v8 5/5] ext4: cleanup inode flag definitions Li Xi
     [not found]     ` <1418102548-5469-6-git-send-email-lixi-LfVdkaOWEx8@public.gmane.org>
2015-01-06 20:05       ` Andreas Dilger
2015-01-26 18:46 ` [v8 0/5] ext4: add project quota support jon ernst
2015-02-13  2:00   ` Li Xi

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