From: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
To: John McCutchan <ttb@tentacle.dhs.org>
Cc: Robert Love <rml@novell.com>,
linux-kernel@vger.kernel.org, Mr Morton <akpm@osdl.org>
Subject: Re: [patch] updated inotify for 2.6.12-rc3.
Date: Fri, 22 Apr 2005 22:13:24 +0100 [thread overview]
Message-ID: <20050422211324.GF13052@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <1114182273.13886.17.camel@vertex>
On Fri, Apr 22, 2005 at 11:04:33AM -0400, John McCutchan wrote:
> On Fri, 2005-04-22 at 09:56 +0100, Al Viro wrote:
> > So what happens if
> > * something is holding inotify_sem right now
> > * ten threads call that on the same watch
> > * all of them get to down(&inode->inotify_sem); and block there,
> > having acquired ten references to the watch
> > * after whatever had been holding ->inotify_sem in the first place
> > releases it, they will one by one go through the rest of function. And
> > drop _20_ references to the watch. 9 of those - after we kfree() the
> > watch...
>
> In create_watch () we call get_inotify_watch (), which maps to the
> put_inotify_watch() in remove_watch(). As far as I can tell the ref
> counting is 1 for 1.
Or it would, if remove_watch() had been called only once. In the scenario
above that will not be true.
next prev parent reply other threads:[~2005-04-22 21:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-21 5:13 [patch] inotify for 2.6.12-rc3 Robert Love
2005-04-21 5:31 ` Robert Love
2005-04-21 23:47 ` [patch] oneshot for inotify Robert Love
2005-04-22 4:57 ` [patch] inotify for 2.6.12-rc3 Robert Love
2005-04-22 5:01 ` [patch] updated " Robert Love
2005-04-22 8:56 ` Al Viro
2005-04-22 15:04 ` John McCutchan
2005-04-22 21:13 ` Al Viro [this message]
2005-04-22 23:27 ` Robert Love
2005-04-28 20:38 ` [patch] latest inotify Robert Love
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