From: Jan Kara <jack@suse.cz>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Richard Weinberger <richard@nod.at>,
Sascha Hauer <s.hauer@pengutronix.de>,
linux-mtd@lists.infradead.org, kernel@pengutronix.de,
Jan Kara <jack@suse.com>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 05/11] quota: Allow to pass quotactl a mountpoint
Date: Thu, 15 Aug 2019 11:53:06 +0200 [thread overview]
Message-ID: <20190815095306.GB14313@quack2.suse.cz> (raw)
In-Reply-To: <20190814235124.GY1131@ZenIV.linux.org.uk>
On Thu 15-08-19 00:51:24, Al Viro wrote:
> On Thu, Aug 15, 2019 at 12:39:46AM +0100, Al Viro wrote:
> > > 1) introduction of EXPORT_SYMBOL_GPL garbage
> > > 2) aforementioned garbage on something that doesn't need to be exported
> > > 3) *way* too easily abused - get_super() is, at least, not tempting to
> > > play with in random code. This one is, and it's too low-level to
> > > allow.
> >
> > ... and this is a crap userland API.
> >
> > *IF* you want mountpoint-based variants of quotactl() commands, by all means,
> > add those. Do not overload the old ones. And for path-based you don't
> > need to mess with superblock references - just keep the struct path until
> > the end. That will keep the superblock alive and active just fine.
>
> To clarify: I suggest something like #define Q_PATH 0x400000
> with users passing something like QCMD(Q_QUOTAON | Q_PATH, ...) instead
> of QCMD(Q_QUOTAON, ...) to get a path-based behaviour.
Yeah, this sounds like a good plan to me. If Sasha plans on using userspace
quota-tools for handling ubifs, some work will be needed there as well but
it's doable.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
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next prev parent reply other threads:[~2019-08-15 9:53 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 12:18 [PATCH 00/11] Add quota support to UBIFS Sascha Hauer
2019-08-14 12:18 ` [PATCH 01/11] quota: Make inode optional Sascha Hauer
2019-08-14 12:18 ` [PATCH 02/11] quota: Only module_put the format when existing Sascha Hauer
2019-08-15 11:18 ` Jan Kara
2019-08-16 11:49 ` Sascha Hauer
2019-08-14 12:18 ` [PATCH 03/11] fs: move __get_super() out of loop Sascha Hauer
2019-08-14 23:32 ` Al Viro
2019-08-14 12:18 ` [PATCH 04/11] fs, quota: introduce wait_super_thawed() to wait until a superblock is thawed Sascha Hauer
2019-08-14 23:35 ` Al Viro
2019-08-14 12:18 ` [PATCH 05/11] quota: Allow to pass quotactl a mountpoint Sascha Hauer
2019-08-14 22:42 ` kbuild test robot
2019-08-14 23:33 ` kbuild test robot
2019-08-14 23:36 ` Al Viro
2019-08-14 23:39 ` Al Viro
2019-08-14 23:51 ` Al Viro
2019-08-15 9:53 ` Jan Kara [this message]
2019-08-15 7:46 ` Sascha Hauer
2019-08-14 12:18 ` [PATCH 06/11] ubifs: move checks and preparation into setflags() Sascha Hauer
2019-08-14 12:18 ` [PATCH 07/11] ubifs: Add support for FS_IOC_FS[SG]ETXATTR ioctls Sascha Hauer
2019-08-14 14:11 ` Mainz, Roland
2019-08-15 7:31 ` Sascha Hauer
2019-08-14 12:18 ` [PATCH 08/11] ubifs: do not ubifs_inode() on potentially NULL pointer Sascha Hauer
2019-08-14 12:18 ` [PATCH 09/11] ubifs: Add support for project id Sascha Hauer
2019-08-14 12:18 ` [PATCH 10/11] ubifs: export get_znode Sascha Hauer
2019-08-14 12:18 ` [PATCH 11/11] ubifs: Add quota support Sascha Hauer
2019-08-15 11:17 ` Jan Kara
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