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[SCTP]: Convert bind_addr_list locking to RCU

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Since the sctp_sockaddr_entry is now RCU enabled as part of
the patch to synchronize sctp_localaddr_list, it makes sense to
change all handling of these entries to RCU.  This includes the
sctp_bind_addrs structure and it's list of bound addresses.

This list is currently protected by an external rw_lock and that
looks like an overkill.  There are only 2 writers to the list:
bind()/bindx() calls, and BH processing of ASCONF-ACK chunks.
These are already seriealized via the socket lock, so they will
not step on each other.  These are also relatively rare, so we
should be good with RCU.

The readers are varied and they are easily converted to RCU.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Sridhar Samdurala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2007-09-16 16:03:28 -07:00 • committed by David S. Miller
parent 2930354799
commit 559cf710b0
8 changed files with 105 additions and 162 deletions
Download patch file Download diff file Expand all files Collapse all files

27
net/sctp/endpointola.c
View file

@ -92,7 +92,6 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
/* Initialize the bind addr area */
sctp_bind_addr_init(&ep->base.bind_addr, 0);
rwlock_init(&ep->base.addr_lock);
/* Remember who we are attached to. */
ep->base.sk = sk;
@ -225,21 +224,14 @@ void sctp_endpoint_put(struct sctp_endpoint *ep)
struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
const union sctp_addr *laddr)
{
struct sctp_endpoint *retval;
struct sctp_endpoint *retval = NULL;
sctp_read_lock(&ep->base.addr_lock);
if (htons(ep->base.bind_addr.port) == laddr->v4.sin_port) {
if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
sctp_sk(ep->base.sk))) {
sctp_sk(ep->base.sk)))
retval = ep;
goto out;
}
}
retval = NULL;
out:
sctp_read_unlock(&ep->base.addr_lock);
return retval;
}
@ -261,9 +253,7 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
list_for_each(pos, &ep->asocs) {
asoc = list_entry(pos, struct sctp_association, asocs);
if (rport == asoc->peer.port) {
sctp_read_lock(&asoc->base.addr_lock);
*transport = sctp_assoc_lookup_paddr(asoc, paddr);
sctp_read_unlock(&asoc->base.addr_lock);
if (*transport)
return asoc;
@ -295,20 +285,17 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
const union sctp_addr *paddr)
{
struct list_head *pos;
struct sctp_sockaddr_entry *addr;
struct sctp_bind_addr *bp;
sctp_read_lock(&ep->base.addr_lock);
bp = &ep->base.bind_addr;
list_for_each(pos, &bp->address_list) {
addr = list_entry(pos, struct sctp_sockaddr_entry, list);
if (sctp_has_association(&addr->a, paddr)) {
sctp_read_unlock(&ep->base.addr_lock);
/* This function is called with the socket lock held,
* so the address_list can not change.
*/
list_for_each_entry(addr, &bp->address_list, list) {
if (sctp_has_association(&addr->a, paddr))
return 1;
}
}
sctp_read_unlock(&ep->base.addr_lock);
return 0;
}