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xfrm: policy: convert policy_lock to spinlock 

After earlier patches conversions all spots acquire the writer lock and
we can now convert this to a normal spinlock.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2016-08-11 15:17:59 +02:00 committed by Steffen Klassert
parent d5b8f86dc7
commit 9d0380df62
2 changed files with 35 additions and 35 deletions
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2
include/net/netns/xfrm.h
View File

@ -73,7 +73,7 @@ struct netns_xfrm {
struct dst_ops xfrm6_dst_ops; struct dst_ops xfrm6_dst_ops;
#endif #endif
spinlock_t xfrm_state_lock; spinlock_t xfrm_state_lock;
rwlock_t xfrm_policy_lock; spinlock_t xfrm_policy_lock;
struct mutex xfrm_cfg_mutex; struct mutex xfrm_cfg_mutex;
/* flow cache part */ /* flow cache part */

68
net/xfrm/xfrm_policy.c
View File

@ -484,7 +484,7 @@ static void xfrm_bydst_resize(struct net *net, int dir)
if (!ndst) if (!ndst)
return; return;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
write_seqcount_begin(&xfrm_policy_hash_generation); write_seqcount_begin(&xfrm_policy_hash_generation);
odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table, odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
@ -500,7 +500,7 @@ static void xfrm_bydst_resize(struct net *net, int dir)
net->xfrm.policy_bydst[dir].hmask = nhashmask; net->xfrm.policy_bydst[dir].hmask = nhashmask;
write_seqcount_end(&xfrm_policy_hash_generation); write_seqcount_end(&xfrm_policy_hash_generation);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
synchronize_rcu(); synchronize_rcu();
@ -519,7 +519,7 @@ static void xfrm_byidx_resize(struct net *net, int total)
if (!nidx) if (!nidx)
return; return;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
for (i = hmask; i >= 0; i--) for (i = hmask; i >= 0; i--)
xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
@ -527,7 +527,7 @@ static void xfrm_byidx_resize(struct net *net, int total)
net->xfrm.policy_byidx = nidx; net->xfrm.policy_byidx = nidx;
net->xfrm.policy_idx_hmask = nhashmask; net->xfrm.policy_idx_hmask = nhashmask;
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
} }
@ -617,7 +617,7 @@ static void xfrm_hash_rebuild(struct work_struct *work)
rbits6 = net->xfrm.policy_hthresh.rbits6; rbits6 = net->xfrm.policy_hthresh.rbits6;
} while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
/* reset the bydst and inexact table in all directions */ /* reset the bydst and inexact table in all directions */
for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
@ -659,7 +659,7 @@ static void xfrm_hash_rebuild(struct work_struct *work)
hlist_add_head(&policy->bydst, chain); hlist_add_head(&policy->bydst, chain);
} }
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
mutex_unlock(&hash_resize_mutex); mutex_unlock(&hash_resize_mutex);
} }
@ -770,7 +770,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
struct hlist_head *chain; struct hlist_head *chain;
struct hlist_node *newpos; struct hlist_node *newpos;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
delpol = NULL; delpol = NULL;
newpos = NULL; newpos = NULL;
@ -781,7 +781,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
xfrm_sec_ctx_match(pol->security, policy->security) && xfrm_sec_ctx_match(pol->security, policy->security) &&
!WARN_ON(delpol)) { !WARN_ON(delpol)) {
if (excl) { if (excl) {
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return -EEXIST; return -EEXIST;
} }
delpol = pol; delpol = pol;
@ -817,7 +817,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
policy->curlft.use_time = 0; policy->curlft.use_time = 0;
if (!mod_timer(&policy->timer, jiffies + HZ)) if (!mod_timer(&policy->timer, jiffies + HZ))
xfrm_pol_hold(policy); xfrm_pol_hold(policy);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
if (delpol) if (delpol)
xfrm_policy_kill(delpol); xfrm_policy_kill(delpol);
@ -837,7 +837,7 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
struct hlist_head *chain; struct hlist_head *chain;
*err = 0; *err = 0;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
chain = policy_hash_bysel(net, sel, sel->family, dir); chain = policy_hash_bysel(net, sel, sel->family, dir);
ret = NULL; ret = NULL;
hlist_for_each_entry(pol, chain, bydst) { hlist_for_each_entry(pol, chain, bydst) {
@ -850,7 +850,7 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
*err = security_xfrm_policy_delete( *err = security_xfrm_policy_delete(
pol->security); pol->security);
if (*err) { if (*err) {
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return pol; return pol;
} }
__xfrm_policy_unlink(pol, dir); __xfrm_policy_unlink(pol, dir);
@ -859,7 +859,7 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
break; break;
} }
} }
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
if (ret && delete) if (ret && delete)
xfrm_policy_kill(ret); xfrm_policy_kill(ret);
@ -878,7 +878,7 @@ struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
return NULL; return NULL;
*err = 0; *err = 0;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
chain = net->xfrm.policy_byidx + idx_hash(net, id); chain = net->xfrm.policy_byidx + idx_hash(net, id);
ret = NULL; ret = NULL;
hlist_for_each_entry(pol, chain, byidx) { hlist_for_each_entry(pol, chain, byidx) {
@ -889,7 +889,7 @@ struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
*err = security_xfrm_policy_delete( *err = security_xfrm_policy_delete(
pol->security); pol->security);
if (*err) { if (*err) {
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return pol; return pol;
} }
__xfrm_policy_unlink(pol, dir); __xfrm_policy_unlink(pol, dir);
@ -898,7 +898,7 @@ struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
break; break;
} }
} }
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
if (ret && delete) if (ret && delete)
xfrm_policy_kill(ret); xfrm_policy_kill(ret);
@ -956,7 +956,7 @@ int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
{ {
int dir, err = 0, cnt = 0; int dir, err = 0, cnt = 0;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
err = xfrm_policy_flush_secctx_check(net, type, task_valid); err = xfrm_policy_flush_secctx_check(net, type, task_valid);
if (err) if (err)
@ -972,14 +972,14 @@ int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
if (pol->type != type) if (pol->type != type)
continue; continue;
__xfrm_policy_unlink(pol, dir); __xfrm_policy_unlink(pol, dir);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
cnt++; cnt++;
xfrm_audit_policy_delete(pol, 1, task_valid); xfrm_audit_policy_delete(pol, 1, task_valid);
xfrm_policy_kill(pol); xfrm_policy_kill(pol);
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
goto again1; goto again1;
} }
@ -991,13 +991,13 @@ int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
if (pol->type != type) if (pol->type != type)
continue; continue;
__xfrm_policy_unlink(pol, dir); __xfrm_policy_unlink(pol, dir);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
cnt++; cnt++;
xfrm_audit_policy_delete(pol, 1, task_valid); xfrm_audit_policy_delete(pol, 1, task_valid);
xfrm_policy_kill(pol); xfrm_policy_kill(pol);
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
goto again2; goto again2;
} }
} }
@ -1006,7 +1006,7 @@ int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
if (!cnt) if (!cnt)
err = -ESRCH; err = -ESRCH;
out: out:
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return err; return err;
} }
EXPORT_SYMBOL(xfrm_policy_flush); EXPORT_SYMBOL(xfrm_policy_flush);
@ -1026,7 +1026,7 @@ int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
if (list_empty(&walk->walk.all) && walk->seq != 0) if (list_empty(&walk->walk.all) && walk->seq != 0)
return 0; return 0;
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
if (list_empty(&walk->walk.all)) if (list_empty(&walk->walk.all))
x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
else else
@ -1054,7 +1054,7 @@ int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
} }
list_del_init(&walk->walk.all); list_del_init(&walk->walk.all);
out: out:
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return error; return error;
} }
EXPORT_SYMBOL(xfrm_policy_walk); EXPORT_SYMBOL(xfrm_policy_walk);
@ -1073,9 +1073,9 @@ void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
if (list_empty(&walk->walk.all)) if (list_empty(&walk->walk.all))
return; return;
write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
list_del(&walk->walk.all); list_del(&walk->walk.all);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
} }
EXPORT_SYMBOL(xfrm_policy_walk_done); EXPORT_SYMBOL(xfrm_policy_walk_done);
@ -1321,9 +1321,9 @@ int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
{ {
struct net *net = xp_net(pol); struct net *net = xp_net(pol);
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
pol = __xfrm_policy_unlink(pol, dir); pol = __xfrm_policy_unlink(pol, dir);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
if (pol) { if (pol) {
xfrm_policy_kill(pol); xfrm_policy_kill(pol);
return 0; return 0;
@ -1342,7 +1342,7 @@ int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
return -EINVAL; return -EINVAL;
#endif #endif
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
old_pol = rcu_dereference_protected(sk->sk_policy[dir], old_pol = rcu_dereference_protected(sk->sk_policy[dir],
lockdep_is_held(&net->xfrm.xfrm_policy_lock)); lockdep_is_held(&net->xfrm.xfrm_policy_lock));
if (pol) { if (pol) {
@ -1360,7 +1360,7 @@ int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
*/ */
xfrm_sk_policy_unlink(old_pol, dir); xfrm_sk_policy_unlink(old_pol, dir);
} }
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
if (old_pol) { if (old_pol) {
xfrm_policy_kill(old_pol); xfrm_policy_kill(old_pol);
@ -1390,9 +1390,9 @@ static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
newp->type = old->type; newp->type = old->type;
memcpy(newp->xfrm_vec, old->xfrm_vec, memcpy(newp->xfrm_vec, old->xfrm_vec,
newp->xfrm_nr*sizeof(struct xfrm_tmpl)); newp->xfrm_nr*sizeof(struct xfrm_tmpl));
write_lock_bh(&net->xfrm.xfrm_policy_lock); spin_lock_bh(&net->xfrm.xfrm_policy_lock);
xfrm_sk_policy_link(newp, dir); xfrm_sk_policy_link(newp, dir);
write_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
xfrm_pol_put(newp); xfrm_pol_put(newp);
} }
return newp; return newp;
@ -3074,7 +3074,7 @@ static int __net_init xfrm_net_init(struct net *net)
/* Initialize the per-net locks here */ /* Initialize the per-net locks here */
spin_lock_init(&net->xfrm.xfrm_state_lock); spin_lock_init(&net->xfrm.xfrm_state_lock);
rwlock_init(&net->xfrm.xfrm_policy_lock); spin_lock_init(&net->xfrm.xfrm_policy_lock);
mutex_init(&net->xfrm.xfrm_cfg_mutex); mutex_init(&net->xfrm.xfrm_cfg_mutex);
return 0; return 0;
@ -3206,7 +3206,7 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *
struct hlist_head *chain; struct hlist_head *chain;
u32 priority = ~0U; u32 priority = ~0U;
read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
hlist_for_each_entry(pol, chain, bydst) { hlist_for_each_entry(pol, chain, bydst) {
if (xfrm_migrate_selector_match(sel, &pol->selector) && if (xfrm_migrate_selector_match(sel, &pol->selector) &&
@ -3230,7 +3230,7 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *
xfrm_pol_hold(ret); xfrm_pol_hold(ret);
read_unlock_bh(&net->xfrm.xfrm_policy_lock); spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return ret; return ret;
} }