fs/afs/security.c

107 void afs_clear_permits(struct afs_vnode *vnode)
111 	spin_lock(&vnode->lock);
112 	permits = rcu_dereference_protected(vnode->permit_cache,
113 					    lockdep_is_held(&vnode->lock));
114 	RCU_INIT_POINTER(vnode->permit_cache, NULL);
115 	spin_unlock(&vnode->lock);
139  * that returned a vnode status for a particular key.  If a callback break
143 void afs_cache_permit(struct afs_vnode *vnode, struct key *key,
153 	       vnode->fid.vid, vnode->fid.vnode, key_serial(key), caller_access);
160 	permits = rcu_dereference(vnode->permit_cache);
173 				if (afs_cb_is_broken(cb_break, vnode)) {
191 			spin_lock(&vnode->lock);
192 			if (permits != rcu_access_pointer(vnode->permit_cache))
194 			RCU_INIT_POINTER(vnode->permit_cache, NULL);
195 			spin_unlock(&vnode->lock);
203 	if (afs_cb_is_broken(cb_break, vnode))
280 	spin_lock(&vnode->lock);
281 	zap = rcu_access_pointer(vnode->permit_cache);
282 	if (!afs_cb_is_broken(cb_break, vnode) && zap == permits)
283 		rcu_assign_pointer(vnode->permit_cache, replacement);
286 	spin_unlock(&vnode->lock);
294 	spin_unlock(&vnode->lock);
303 static bool afs_check_permit_rcu(struct afs_vnode *vnode, struct key *key,
310 	       vnode->fid.vid, vnode->fid.vnode, key_serial(key));
313 	if (key == vnode->volume->cell->anonymous_key) {
314 		*_access = vnode->status.anon_access;
319 	permits = rcu_dereference(vnode->permit_cache);
342 int afs_check_permit(struct afs_vnode *vnode, struct key *key,
350 	       vnode->fid.vid, vnode->fid.vnode, key_serial(key));
353 	if (key == vnode->volume->cell->anonymous_key) {
355 		*_access = vnode->status.anon_access;
359 		permits = rcu_dereference(vnode->permit_cache);
381 		ret = afs_fetch_status(vnode, key, false, _access);
401 	struct afs_vnode *vnode = AFS_FS_I(inode);
407 	       vnode->fid.vid, vnode->fid.vnode, vnode->flags, mask);
410 		key = afs_request_key_rcu(vnode->volume->cell);
415 		if (!afs_check_validity(vnode) ||
416 		    !afs_check_permit_rcu(vnode, key, &access))
419 		key = afs_request_key(vnode->volume->cell);
425 		ret = afs_validate(vnode, key);
430 		ret = afs_check_permit(vnode, key, &access);