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nfsd: provide callbacks on svc_xprt deletion

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NFSv4.1 needs warning when a client tcp connection goes down, if that
connection is being used as a backchannel, so that it can warn the
client that it has lost the backchannel connection.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2010-03-22 15:37:17 -04:00 committed by J. Bruce Fields
parent c7662518c7
commit edc7a89403
2 changed files with 40 additions and 0 deletions
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25
include/linux/sunrpc/svc_xprt.h
View file

@ -33,6 +33,16 @@ struct svc_xprt_class {
u32 xcl_max_payload;
};
/*
* This is embedded in an object that wants a callback before deleting
* an xprt; intended for use by NFSv4.1, which needs to know when a
* client's tcp connection (and hence possibly a backchannel) goes away.
*/
struct svc_xpt_user {
struct list_head list;
void (*callback)(struct svc_xpt_user *);
};
struct svc_xprt {
struct svc_xprt_class *xpt_class;
struct svc_xprt_ops *xpt_ops;
@ -67,10 +77,25 @@ struct svc_xprt {
struct sockaddr_storage xpt_remote; /* remote peer's address */
size_t xpt_remotelen; /* length of address */
struct rpc_wait_queue xpt_bc_pending; /* backchannel wait queue */
struct list_head xpt_users; /* callbacks on free */
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);
list_del_init(&u->list);
spin_unlock(&xpt->xpt_lock);
}
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 *,

15
net/sunrpc/svc_xprt.c
View file

@ -156,6 +156,7 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
INIT_LIST_HEAD(&xprt->xpt_list);
INIT_LIST_HEAD(&xprt->xpt_ready);
INIT_LIST_HEAD(&xprt->xpt_deferred);
INIT_LIST_HEAD(&xprt->xpt_users);
mutex_init(&xprt->xpt_mutex);
spin_lock_init(&xprt->xpt_lock);
set_bit(XPT_BUSY, &xprt->xpt_flags);
@ -881,6 +882,19 @@ static void svc_age_temp_xprts(unsigned long closure)
mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ);
}
static void call_xpt_users(struct svc_xprt *xprt)
{
struct svc_xpt_user *u;
spin_lock(&xprt->xpt_lock);
while (!list_empty(&xprt->xpt_users)) {
u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list);
list_del(&u->list);
u->callback(u);
}
spin_unlock(&xprt->xpt_lock);
}
/*
* Remove a dead transport
*/
@ -913,6 +927,7 @@ void svc_delete_xprt(struct svc_xprt *xprt)
while ((dr = svc_deferred_dequeue(xprt)) != NULL)
kfree(dr);
call_xpt_users(xprt);
svc_xprt_put(xprt);
}