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NLM: Fix reclaim races

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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>
This commit is contained in:
Trond Myklebust
2006-06-09 09:40:27 -04:00
parent 5046791417
commit 28df955a2a
4 changed files with 40 additions and 15 deletions
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include/linux/lockd/lockd.h
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@@ -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 */