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| author | Olaf Kirch <okir@suse.de> | 2006-10-04 02:16:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-04 07:55:17 -0700 |
| commit | 031d869d0e0be18cfe35526be5608225b8f0a7be (patch) | |
| tree | b9b8445bec58d268feaa2efb61da5133ffcc2093 | |
| parent | abd1f50094cad9dff6d68ada98b495549f52fc30 (diff) | |
| download | linux-031d869d0e0be18cfe35526be5608225b8f0a7be.tar.gz linux-031d869d0e0be18cfe35526be5608225b8f0a7be.tar.bz2 linux-031d869d0e0be18cfe35526be5608225b8f0a7be.zip | |
[PATCH] knfsd: make nlmclnt_next_cookie SMP safe
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 <okir@suse.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | fs/lockd/clntproc.c | 10 | ||||
| -rw-r--r-- | include/linux/lockd/lockd.h | 1 |
2 files changed, 6 insertions, 5 deletions
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index 7e6f22e2a3b4..3d84f600b633 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -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) diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index 7be7aeaeee58..a345650e5622 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -157,6 +157,7 @@ int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout) u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *); void nlmclnt_recovery(struct nlm_host *); int nlmclnt_reclaim(struct nlm_host *, struct file_lock *); +void nlmclnt_next_cookie(struct nlm_cookie *); /* * Host cache |