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nfsd4: fix 4.1 connection registration race

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If a connection is closed just after a sequence or create_session
is sent over it, we could end up trying to register a callback that will
never get called since the xprt is already marked dead.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2010-10-26 10:07:17 -04:00
parent c8ddb2713c
commit 21b75b0199
2 changed files with 29 additions and 11 deletions
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24
include/linux/sunrpc/svc_xprt.h
View file

@ -82,13 +82,6 @@ struct svc_xprt {
struct net *xpt_net;
};
static inline void register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
{
spin_lock(&xpt->xpt_lock);
list_add(&u->list, &xpt->xpt_users);
spin_unlock(&xpt->xpt_lock);
}
static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
{
spin_lock(&xpt->xpt_lock);
@ -96,6 +89,23 @@ static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user
spin_unlock(&xpt->xpt_lock);
}
static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
{
spin_lock(&xpt->xpt_lock);
if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
/*
* The connection is about to be deleted soon (or,
* worse, may already be deleted--in which case we've
* already notified the xpt_users).
*/
spin_unlock(&xpt->xpt_lock);
return -ENOTCONN;
}
list_add(&u->list, &xpt->xpt_users);
spin_unlock(&xpt->xpt_lock);
return 0;
}
int svc_reg_xprt_class(struct svc_xprt_class *);
void svc_unreg_xprt_class(struct svc_xprt_class *);
void svc_xprt_init(struct svc_xprt_class *, struct svc_xprt *,