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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:40:27 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:40:27 -0400
commit28df955a2ad484d602314b30183ea8496a9aa34a (patch)
treec62632b2a0a49df114283f10764244c1b1b5f506 /include/linux
parent5046791417dcac1ba126b77b8062af15a2f0b8e1 (diff)
downloadop-kernel-dev-28df955a2ad484d602314b30183ea8496a9aa34a.zip
op-kernel-dev-28df955a2ad484d602314b30183ea8496a9aa34a.tar.gz
NLM: Fix reclaim races
Currently it is possible for a task to remove its locks at the same time as the NLM recovery thread is trying to recover them. This quickly leads to an Oops. Protect the locks using an rw semaphore while they are being recovered. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/lockd/lockd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index a6c1a33..6b26847 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -50,6 +50,7 @@ struct nlm_host {
h_killed : 1,
h_monitored : 1;
wait_queue_head_t h_gracewait; /* wait while reclaiming */
+ struct rw_semaphore h_rwsem; /* Reboot recovery lock */
u32 h_state; /* pseudo-state counter */
u32 h_nsmstate; /* true remote NSM state */
u32 h_pidcount; /* Pseudopids */
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