From: Thomas Graf <tgraf@suug.ch>
To: Patrick McHardy <kaber@trash.net>
Cc: davem@davemloft.net, herbert@gondor.apana.org.au,
paulmck@linux.vnet.ibm.com, ying.xue@windriver.com,
netdev@vger.kernel.org, netfilter-devel@vger.kernel.org
Subject: Re: [PATCH 3/3] netlink: Lock out table resizes while dumping Netlink sockets
Date: Tue, 20 Jan 2015 15:35:56 +0000 [thread overview]
Message-ID: <20150120153556.GJ20315@casper.infradead.org> (raw)
In-Reply-To: <20150120152149.GA3012@acer.localdomain>
On 01/20/15 at 03:21pm, Patrick McHardy wrote:
> I think its preferrable to make the need to handle NETLINK_F_DUMP_INTR
> as noticable as possible and not hide it. Silent failure is the worst
> kind of failure.
I agree to that. The point here is to avoid unnecessary use of
NETLINK_F_DUMP_INTR if all entries fit into a single message buffer.
> Yeah. The point could be made that this is a regression though. We didn't
> require userspace to deal with interruptions before, and the behaviour
> was well defined and acceptable for most cases, its not anymore.
>
> So I think it should be handled by the kernel, without changes to
> userspace.
nl_table_lock was released between individual messages just like
ht->mutex is released with this change.
What changed is that inserts and removal can now occur *while* the
message is being constructed whereas previously they could only
occur between message construction periods. In either case, the dump
would end up missing entries or showing duplicates.
next prev parent reply other threads:[~2015-01-20 15:35 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-20 13:20 [PATCH 0/3 net-next] rhashtable: Notify on resize to allow signaling interrupted dumps Thomas Graf
2015-01-20 13:20 ` [PATCH 1/3] rhashtable: Provide notifier for deferred resizes Thomas Graf
2015-01-20 13:20 ` [PATCH 2/3] netlink: Mark dumps as inconsistent which have been interrupted by a resize Thomas Graf
2015-01-21 8:13 ` Ying Xue
2015-01-21 12:17 ` Thomas Graf
2015-01-22 8:49 ` Herbert Xu
2015-01-22 8:56 ` Patrick McHardy
2015-01-22 9:22 ` Herbert Xu
2015-01-22 10:07 ` Patrick McHardy
2015-01-25 23:20 ` [PATCH 0/2] rhashtable: Add walk iterator primitives and use them in netlink Herbert Xu
2015-01-25 23:21 ` [PATCH 1/2] rhashtable: Introduce rhashtable_walk_* Herbert Xu
2015-01-26 8:20 ` Thomas Graf
2015-01-26 22:21 ` Herbert Xu
2015-01-26 10:09 ` David Laight
2015-01-26 22:23 ` Herbert Xu
2015-01-26 22:36 ` David Miller
2015-01-26 22:42 ` Herbert Xu
2015-01-26 23:31 ` Herbert Xu
2015-01-27 9:45 ` Thomas Graf
2015-01-27 9:54 ` Herbert Xu
2015-01-27 10:15 ` Thomas Graf
2015-01-27 10:24 ` Herbert Xu
2015-01-27 11:16 ` Thomas Graf
2015-01-27 11:23 ` Herbert Xu
2015-01-27 11:40 ` Thomas Graf
2015-01-27 20:39 ` Herbert Xu
2015-01-27 22:10 ` David Miller
2015-01-27 23:16 ` Herbert Xu
2015-01-27 13:09 ` Patrick McHardy
2015-01-27 20:36 ` Herbert Xu
2015-01-28 19:07 ` Patrick McHardy
2015-01-30 5:58 ` Herbert Xu
2015-01-30 8:10 ` Patrick McHardy
2015-01-27 10:09 ` David Laight
2015-01-27 10:12 ` Herbert Xu
2015-01-25 23:21 ` [PATCH 2/2] netlink: Use rhashtable walk iterator Herbert Xu
2015-01-27 23:19 ` [PATCH 0/2] rhashtable: Add walk iterator primitives and use them in netlink Herbert Xu
2015-01-27 23:20 ` [PATCH 1/2] rhashtable: Introduce rhashtable_walk_* Herbert Xu
2015-01-29 22:26 ` Thomas Graf
2015-01-27 23:20 ` [PATCH 2/2] netlink: Use rhashtable walk iterator Herbert Xu
2015-01-29 22:27 ` Thomas Graf
2015-01-29 22:42 ` [PATCH 0/2] rhashtable: Add walk iterator primitives and use them in netlink David Miller
2015-01-31 3:13 ` Herbert Xu
2015-01-31 3:14 ` [PATCH 1/2] rhashtable: Introduce rhashtable_walk_* Herbert Xu
2015-01-31 3:14 ` [PATCH 2/2] netlink: Use rhashtable walk iterator Herbert Xu
2015-01-31 4:31 ` netfilter: " Herbert Xu
2015-02-01 7:45 ` Patrick McHardy
2015-02-03 3:19 ` David Miller
2015-02-03 3:19 ` [PATCH 0/2] rhashtable: Add walk iterator primitives and use them in netlink David Miller
2015-01-20 13:20 ` [PATCH 3/3] netlink: Lock out table resizes while dumping Netlink sockets Thomas Graf
2015-01-20 14:31 ` Patrick McHardy
2015-01-20 14:55 ` Thomas Graf
2015-01-20 15:21 ` Patrick McHardy
2015-01-20 15:35 ` Thomas Graf [this message]
2015-01-21 5:08 ` Herbert Xu
2015-01-21 5:15 ` Herbert Xu
2015-01-21 9:14 ` Herbert Xu
2015-01-21 9:56 ` Thomas Graf
2015-01-21 9:59 ` Herbert Xu
2015-01-21 10:00 ` Patrick McHardy
2015-01-21 9:37 ` Thomas Graf
2015-01-21 9:38 ` Herbert Xu
2015-01-21 9:49 ` Thomas Graf
2015-01-21 9:58 ` Herbert Xu
2015-01-21 10:23 ` Thomas Graf
2015-01-22 6:35 ` Herbert Xu
2015-01-22 7:20 ` Herbert Xu
2015-01-22 9:05 ` Thomas Graf
2015-01-22 9:50 ` Herbert Xu
2015-01-21 10:34 ` Thomas Graf
2015-01-21 10:40 ` Patrick McHardy
2015-01-21 11:37 ` Thomas Graf
2015-01-21 11:59 ` Patrick McHardy
2015-01-21 12:07 ` Thomas Graf
2015-01-21 12:09 ` Patrick McHardy
2015-01-21 10:36 ` David Laight
2015-01-20 15:00 ` David Laight
2015-01-20 15:05 ` Thomas Graf
2015-01-21 5:11 ` Herbert Xu
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