From: Eric Paris <eparis@redhat.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-kernel@vger.kernel.org, malware-list@lists.printk.net,
akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk,
arjan@infradead.org, hch@infradead.org, a.p.zijlstra@chello.nl
Subject: Re: [PATCH -v3 8/8] dnotify: reimplement dnotify using fsnotify
Date: Fri, 28 Nov 2008 18:37:32 -0500 [thread overview]
Message-ID: <1227915452.3393.16.camel@localhost.localdomain> (raw)
In-Reply-To: <20081128051443.GH28946@ZenIV.linux.org.uk>
On Fri, 2008-11-28 at 05:14 +0000, Al Viro wrote:
> On Tue, Nov 25, 2008 at 12:21:33PM -0500, Eric Paris wrote:
>
> > + .mark_clear_inode = clear_mark_dir_notify,
>
> ... called under a spinlock
>
> > +static void clear_mark_dir_notify(struct fsnotify_mark_entry *entry, struct inode *inode, unsigned long mask __attribute__ ((unused)), unsigned int flags)
> > +{
> ...
> > + fsnotify_put_group(dnotify_group);
>
> ... which grabs a mutex.
You're right, I should drop and retake the spinlock. But in reality I
shouldn't ever get here and plan to replace all of this code with a
BUG() rather than the WARN() I have today since I know I can safely
recover.
> Incidentally, why the hell do you bother with refcounting on groups here?
> dnotify is not something that's going to be unloaded, for fsck sake...
Well, I do unregister dnotify if you stop watching any files. I also
plan to implement inotify as one inotify_init() per group. And fsnotify
groups exist only as long as there is a fsnotify socket bound....
-Eric
next prev parent reply other threads:[~2008-11-28 23:37 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-25 17:20 [PATCH -v3 0/8] file notification: fsnotify a unified file notification backend Eric Paris
2008-11-25 17:20 ` [PATCH -v3 1/8] filesystem notification: create fs/notify to contain all fs notification Eric Paris
2008-11-28 5:24 ` Al Viro
2008-11-25 17:21 ` [PATCH -v3 2/8] fsnotify: pass a file instead of an inode to open, read, and write Eric Paris
2008-11-25 17:21 ` [PATCH -v3 3/8] fsnotify: sys_execve and sys_uselib do not call into fsnotify Eric Paris
2008-11-28 10:16 ` Christoph Hellwig
2008-11-25 17:21 ` [PATCH -v3 4/8] fsnotify: use the new open-exec hook for inotify and dnotify Eric Paris
2008-11-25 17:21 ` [PATCH -v3 5/8] fsnotify: unified filesystem notification backend Eric Paris
2008-11-27 16:14 ` Peter Zijlstra
2008-11-27 16:17 ` Peter Zijlstra
2008-11-27 16:20 ` Peter Zijlstra
2008-11-28 23:22 ` Eric Paris
2008-11-28 23:39 ` Peter Zijlstra
2008-11-27 16:21 ` Peter Zijlstra
2008-11-28 4:54 ` Al Viro
2008-11-28 23:32 ` Eric Paris
2008-11-25 17:21 ` [PATCH -v3 6/8] fsnotify: add group priorities Eric Paris
2008-11-27 16:25 ` Peter Zijlstra
2008-12-01 15:20 ` Eric Paris
2008-12-01 15:37 ` Peter Zijlstra
2008-11-25 17:21 ` [PATCH -v3 7/8] fsnotify: add in inode fsnotify markings Eric Paris
2008-11-27 16:29 ` Peter Zijlstra
2008-11-28 5:42 ` Al Viro
2008-11-28 23:43 ` Eric Paris
2008-11-25 17:21 ` [PATCH -v3 8/8] dnotify: reimplement dnotify using fsnotify Eric Paris
2008-11-28 5:14 ` Al Viro
2008-11-28 23:37 ` Eric Paris [this message]
2008-11-28 6:25 ` Al Viro
2008-11-28 23:44 ` Eric Paris
2008-11-26 0:14 ` [PATCH -v3 0/8] file notification: fsnotify a unified file notification backend Andrew Morton
2008-11-26 2:00 ` Eric Paris
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