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From: David Howells <dhowells@redhat.com>
To: Jeff Layton <jlayton@redhat.com>
Cc: dhowells@redhat.com, linux-cachefs@redhat.com,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <sfrench@samba.org>,
	Dominique Martinet <asmadeus@codewreck.org>,
	David Wysochanski <dwysocha@redhat.com>,
	linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org,
	linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org,
	v9fs-developer@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/12] fscache: Fix fscache_cookie_put() to not deref after dec
Date: Wed, 25 Aug 2021 15:05:51 +0100	[thread overview]
Message-ID: <2030919.1629900351@warthog.procyon.org.uk> (raw)
In-Reply-To: <6370d0a74c3ceb79c53305a64ba7a982d16d34b4.camel@redhat.com>

Jeff Layton <jlayton@redhat.com> wrote:

> > fscache_cookie_put() accesses the cookie it has just put inside the
> > tracepoint that monitors the change - but this is something it's not
> > allowed to do if we didn't reduce the count to zero.
> 
> Do you mean "if the count went to zero." ?

No.  If *we* reduced the count to zero, it falls to us to destroy the object,
so we're allowed to look into it again.

If we didn't reduce the count to zero, then someone else might destroy it
before we look into it again.

David


  parent reply	other threads:[~2021-08-25 14:06 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-21 21:44 [PATCH 00/12] fscache: Some prep work for fscache rewrite David Howells
2021-06-21 21:44 ` [PATCH 01/12] fscache: Select netfs stats if fscache stats are enabled David Howells
2021-06-21 21:45 ` [PATCH 02/12] netfs: Move cookie debug ID to struct netfs_cache_resources David Howells
2021-06-21 21:45 ` [PATCH 03/12] cachefiles: Use file_inode() rather than accessing ->f_inode David Howells
2021-06-21 21:45 ` [PATCH 04/12] fscache: Add a cookie debug ID and use that in traces David Howells
2021-06-21 21:45 ` [PATCH 05/12] fscache: Procfile to display cookies David Howells
2021-06-21 21:45 ` [PATCH 06/12] fscache, cachefiles: Remove the histogram stuff David Howells
2021-06-21 21:46 ` [PATCH 07/12] fscache: Remove the object list procfile David Howells
2021-06-21 21:46 ` [PATCH 08/12] fscache: Change %p in format strings to something else David Howells
2021-06-21 21:46 ` [PATCH 09/12] cachefiles: " David Howells
2021-06-21 21:46 ` [PATCH 10/12] fscache: Fix cookie key hashing David Howells
2021-08-24 16:11   ` Jeff Layton
2021-08-25 14:04   ` David Howells
2021-06-21 21:47 ` [PATCH 11/12] fscache: Fix fscache_cookie_put() to not deref after dec David Howells
2021-08-24 14:24   ` Jeff Layton
2021-08-25 14:05   ` David Howells [this message]
2021-06-21 21:47 ` [PATCH 12/12] fscache: Use refcount_t for the cookie refcount instead of atomic_t David Howells
2021-08-24 14:25 ` [PATCH 00/12] fscache: Some prep work for fscache rewrite Jeff Layton
2021-08-27 12:31 ` [PATCH v2 04/12] fscache: Add a cookie debug ID and use that in traces David Howells
2021-08-27 12:49   ` [Linux-cachefs] " Marc Dionne

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