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afs: Fix lost servers_outstanding count 

[ Upstream commit 36f82c93ee ]

The afs_fs_probe_dispatcher() work function is passed a count on
net->servers_outstanding when it is scheduled (which may come via its
timer).  This is passed back to the work_item, passed to the timer or
dropped at the end of the dispatcher function.

But, at the top of the dispatcher function, there are two checks which
skip the rest of the function: if the network namespace is being destroyed
or if there are no fileservers to probe.  These two return paths, however,
do not drop the count passed to the dispatcher, and so, sometimes, the
destruction of a network namespace, such as induced by rmmod of the kafs
module, may get stuck in afs_purge_servers(), waiting for
net->servers_outstanding to become zero.

Fix this by adding the missing decrements in afs_fs_probe_dispatcher().

Fixes: f6cbb368bc ("afs: Actively poll fileservers to maintain NAT or firewall openings")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/167164544917.2072364.3759519569649459359.stgit@warthog.procyon.org.uk/
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2022-12-21 14:30:48 +00:00 committed by Greg Kroah-Hartman
parent b783e03a7f
commit 2c703bc557
1 changed files with 4 additions and 1 deletions
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5
fs/afs/fs_probe.c
View File

@ -366,12 +366,15 @@ void afs_fs_probe_dispatcher(struct work_struct *work)
unsigned long nowj, timer_at, poll_at;
bool first_pass = true, set_timer = false;
if (!net->live)
if (!net->live) {
afs_dec_servers_outstanding(net);
return;
}
_enter("");
if (list_empty(&net->fs_probe_fast) && list_empty(&net->fs_probe_slow)) {
afs_dec_servers_outstanding(net);
_leave(" [none]");
return;
}