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[PATCH] knfsd: make nlmclnt_next_cookie SMP safe

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The way we incremented the NLM cookie in nlmclnt_next_cookie was not thread
safe.  This patch changes the counter to an atomic_t

Signed-off-by: Olaf Kirch <[email protected]>
Signed-off-by: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Olaf Kirch 2006-10-04 02:16:02 -07:00 • committed by Linus Torvalds
commit 031d869d0e
2 changed files with 6 additions and 5 deletions
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10
fs/lockd/clntproc.c
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@ -36,14 +36,14 @@ static const struct rpc_call_ops nlmclnt_cancel_ops;
/*
* Cookie counter for NLM requests
*/
static u32 nlm_cookie = 0x1234;
static atomic_t nlm_cookie = ATOMIC_INIT(0x1234);
static inline void nlmclnt_next_cookie(struct nlm_cookie *c)
void nlmclnt_next_cookie(struct nlm_cookie *c)
{
memcpy(c->data, &nlm_cookie, 4);
memset(c->data+4, 0, 4);
u32 cookie = atomic_inc_return(&nlm_cookie);
memcpy(c->data, &cookie, 4);
c->len=4;
nlm_cookie++;
}
static struct nlm_lockowner *nlm_get_lockowner(struct nlm_lockowner *lockowner)