From: Jan Kara <jack@suse.cz>
To: Amir Goldstein <amir73il@gmail.com>
Cc: Jan Kara <jack@suse.cz>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Lino Sanfilippo <LinoSanfilippo@gmx.de>,
Miklos Szeredi <miklos@szeredi.hu>,
Paul Moore <paul@paul-moore.com>
Subject: Re: [PATCH 11/22] fsnotify: Remove special handling of mark destruction on group shutdown
Date: Fri, 23 Dec 2016 14:31:22 +0100 [thread overview]
Message-ID: <20161223133122.GD22679@quack2.suse.cz> (raw)
In-Reply-To: <CAOQ4uxgrXA_Davn69zyfxWStuzf5yCNaPN71J5Lyi2r1putucQ@mail.gmail.com>
On Fri 23-12-16 14:12:19, Amir Goldstein wrote:
> On Thu, Dec 22, 2016 at 11:15 AM, Jan Kara <jack@suse.cz> wrote:
> > Currently we queue all marks for destruction on group shutdown and then
> > destroy them from fsnotify_destroy_group() instead from a worker thread
> > which is the usual path. However worker can already be processing some
> > list of marks to destroy so this does not make 100% all marks are really
> > destroyed by the time group is shut down. This isn't a big problem as
> > each mark holds group reference and thus group stays partially alive
> > until all marks are really freed but there's no point in complicating
> > our lives - just wait for the delayed work to be finished instead.
> >
> > Signed-off-by: Jan Kara <jack@suse.cz>
>
> Isn't it *required* to wait for all marks to really be freed and not only
> nice behavior following the same reason for
> 35e4817 fsnotify: avoid spurious EMFILE errors from inotify_init()
>
> Otherwise
>
> Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Well, it is not nice to leave marks dangling after the group destruction
exactly for the reason you reference above. But OTOH it is mostly an
annoyance and not a serious issue unless it happens a lot (which it did not
in this case).
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2016-12-23 13:31 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-22 9:15 [PATCH 0/22] fsnotify: Avoid SRCU stalls with fanotify permission events Jan Kara
2016-12-22 9:15 ` [PATCH 01/22] fsnotify: Remove unnecessary tests when showing fdinfo Jan Kara
2016-12-22 12:59 ` Amir Goldstein
2016-12-22 15:16 ` Jan Kara
2016-12-22 15:54 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 02/22] inotify: Remove inode pointers from debug messages Jan Kara
2016-12-22 15:31 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 03/22] fanotify: Move recalculation of inode / vfsmount mask under mark_mutex Jan Kara
2016-12-22 16:27 ` Amir Goldstein
2016-12-22 17:31 ` Jan Kara
2016-12-22 19:08 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 04/22] fsnotify: Remove fsnotify_duplicate_mark() Jan Kara
2016-12-22 23:13 ` Paul Moore
2016-12-23 13:22 ` Jan Kara
2016-12-23 14:01 ` Paul Moore
2016-12-22 9:15 ` [PATCH 05/22] audit: Fix sleep in atomic Jan Kara
2016-12-22 23:18 ` Paul Moore
2016-12-23 13:24 ` Jan Kara
2016-12-23 14:17 ` Paul Moore
2016-12-26 16:33 ` Paul Moore
2017-01-02 18:21 ` Jan Kara
2017-01-03 21:11 ` Paul Moore
2017-01-03 21:11 ` Paul Moore
2017-01-04 8:50 ` Jan Kara
2017-01-05 2:14 ` Paul Moore
2016-12-22 9:15 ` [PATCH 06/22] audit: Abstract hash key handling Jan Kara
2016-12-22 23:27 ` Paul Moore
2016-12-23 13:27 ` Jan Kara
2016-12-23 14:13 ` Paul Moore
2017-01-03 17:34 ` Jan Kara
2017-01-05 2:06 ` Paul Moore
2016-12-22 9:15 ` [PATCH 07/22] fsnotify: Update comments Jan Kara
2016-12-23 4:45 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 08/22] fsnotify: Attach marks to object via dedicated head structure Jan Kara
2016-12-23 5:48 ` Amir Goldstein
2016-12-23 13:34 ` Jan Kara
2017-01-04 13:38 ` Jan Kara
2017-01-04 15:29 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 09/22] inotify: Do not drop mark reference under idr_lock Jan Kara
2016-12-23 8:04 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 10/22] fsnotify: Detach mark from object list when last reference is dropped Jan Kara
2016-12-23 10:51 ` Amir Goldstein
2016-12-23 13:42 ` Jan Kara
2016-12-22 9:15 ` [PATCH 11/22] fsnotify: Remove special handling of mark destruction on group shutdown Jan Kara
2016-12-23 12:12 ` Amir Goldstein
2016-12-23 13:31 ` Jan Kara [this message]
2016-12-22 9:15 ` [PATCH 12/22] fsnotify: Move queueing of mark for destruction into fsnotify_put_mark() Jan Kara
2016-12-26 14:15 ` Amir Goldstein
2017-01-04 10:28 ` Jan Kara
2017-01-04 12:22 ` Jan Kara
2016-12-22 9:15 ` [PATCH 13/22] fsnotify: Provide framework for dropping SRCU lock in ->handle_event Jan Kara
2016-12-26 15:01 ` Amir Goldstein
2016-12-26 15:11 ` Amir Goldstein
2017-01-04 9:03 ` Jan Kara
2017-01-04 10:50 ` Amir Goldstein
2017-01-04 11:45 ` Jan Kara
2016-12-26 18:37 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 14/22] fsnotify: Pass SRCU index into handle_event handler Jan Kara
2016-12-26 15:13 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 15/22] fanotify: Release SRCU lock when waiting for userspace response Jan Kara
2016-12-26 15:22 ` Amir Goldstein
2017-01-04 9:05 ` Jan Kara
2016-12-22 9:15 ` [PATCH 16/22] fsnotify: Remove fsnotify_set_mark_{,ignored_}mask_locked() Jan Kara
2016-12-26 16:42 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 17/22] fsnotify: Remove fsnotify_recalc_{inode|vfsmount}_mask() Jan Kara
2016-12-26 16:44 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 18/22] fsnotify: Inline fsnotify_clear_{inode|vfsmount|_mark_group() Jan Kara
2016-12-26 16:57 ` Amir Goldstein
2017-01-04 9:28 ` Jan Kara
2016-12-22 9:15 ` [PATCH 19/22] fsnotify: Remove fsnotify_find_{inode|vfsmount}_mark() Jan Kara
2016-12-26 17:14 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 20/22] fsnotify: Drop inode_mark.c Jan Kara
2016-12-26 17:15 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 21/22] fsnotify: Add group pointer in fsnotify_init_mark() Jan Kara
2016-12-26 17:34 ` Amir Goldstein
2016-12-22 9:15 ` [PATCH 22/22] fsnotify: Move ->free_mark callback to fsnotify_ops Jan Kara
2016-12-26 17:39 ` Amir Goldstein
2016-12-22 20:58 ` [PATCH 0/22] fsnotify: Avoid SRCU stalls with fanotify permission events Paul Moore
2016-12-22 21:05 ` Amir Goldstein
2016-12-22 23:04 ` Paul Moore
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