78  * Dispose of a list of permits.
82 	struct afs_permits *permits =  in afs_permits_rcu()  local
86 	for (i = 0; i < permits->nr_permits; i++)  in afs_permits_rcu()
87 		key_put(permits->permits[i].key);  in afs_permits_rcu()
88 	kfree(permits);  in afs_permits_rcu()
94 void afs_put_permits(struct afs_permits *permits)  in afs_put_permits()  argument
96 	if (permits && refcount_dec_and_test(&permits->usage)) {  in afs_put_permits()
98 		hash_del_rcu(&permits->hash_node);  in afs_put_permits()
100 		call_rcu(&permits->rcu, afs_permits_rcu);  in afs_put_permits()
109 	struct afs_permits *permits;  in afs_clear_permits()  local
112 	permits = rcu_dereference_protected(vnode->permit_cache,  in afs_clear_permits()
117 	afs_put_permits(permits);  in afs_clear_permits()
121  * Hash a list of permits.  Use simple addition to make it easy to add an extra
124 static void afs_hash_permits(struct afs_permits *permits)  in afs_hash_permits()  argument
126 	unsigned long h = permits->nr_permits;  in afs_hash_permits()
129 	for (i = 0; i < permits->nr_permits; i++) {  in afs_hash_permits()
130 		h += (unsigned long)permits->permits[i].key / sizeof(void *);  in afs_hash_permits()
131 		h += permits->permits[i].access;  in afs_hash_permits()
134 	permits->h = h;  in afs_hash_permits()
146 	struct afs_permits *permits, *xpermits, *replacement, *zap, *new = NULL;  in afs_cache_permit()  local
160 	permits = rcu_dereference(vnode->permit_cache);  in afs_cache_permit()
161 	if (permits) {  in afs_cache_permit()
162 		if (!permits->invalidated) {  in afs_cache_permit()
163 			for (i = 0; i < permits->nr_permits; i++) {  in afs_cache_permit()
164 				if (permits->permits[i].key < key)  in afs_cache_permit()
166 				if (permits->permits[i].key > key)  in afs_cache_permit()
168 				if (permits->permits[i].access != caller_access) {  in afs_cache_permit()
184 		changed |= permits->invalidated;  in afs_cache_permit()
185 		size = permits->nr_permits;  in afs_cache_permit()
187 		/* If this set of permits is now wrong, clear the permits  in afs_cache_permit()
192 			if (permits != rcu_access_pointer(vnode->permit_cache))  in afs_cache_permit()
197 			afs_put_permits(permits);  in afs_cache_permit()
198 			permits = NULL;  in afs_cache_permit()
206 	/* We need a ref on any permits list we want to copy as we'll have to  in afs_cache_permit()
209 	if (permits && !refcount_inc_not_zero(&permits->usage))  in afs_cache_permit()
222 	new = kzalloc(struct_size(new, permits, size), GFP_NOFS);  in afs_cache_permit()
229 	if (permits) {  in afs_cache_permit()
230 		for (i = 0; i < permits->nr_permits; i++) {  in afs_cache_permit()
231 			if (j == i && permits->permits[i].key > key) {  in afs_cache_permit()
232 				new->permits[j].key = key;  in afs_cache_permit()
233 				new->permits[j].access = caller_access;  in afs_cache_permit()
236 			new->permits[j].key = permits->permits[i].key;  in afs_cache_permit()
237 			new->permits[j].access = permits->permits[i].access;  in afs_cache_permit()
243 		new->permits[j].key = key;  in afs_cache_permit()
244 		new->permits[j].access = caller_access;  in afs_cache_permit()
256 		    memcmp(xpermits->permits, new->permits,  in afs_cache_permit()
269 		key_get(new->permits[i].key);  in afs_cache_permit()
282 	if (!afs_cb_is_broken(cb_break, vnode) && zap == permits)  in afs_cache_permit()
290 	afs_put_permits(permits);  in afs_cache_permit()
306 	const struct afs_permits *permits;  in afs_check_permit_rcu()  local
312 	/* check the permits to see if we've got one yet */  in afs_check_permit_rcu()
319 	permits = rcu_dereference(vnode->permit_cache);  in afs_check_permit_rcu()
320 	if (permits) {  in afs_check_permit_rcu()
321 		for (i = 0; i < permits->nr_permits; i++) {  in afs_check_permit_rcu()
322 			if (permits->permits[i].key < key)  in afs_check_permit_rcu()
324 			if (permits->permits[i].key > key)  in afs_check_permit_rcu()
327 			*_access = permits->permits[i].access;  in afs_check_permit_rcu()
328 			_leave(" = %u [perm %x]", !permits->invalidated, *_access);  in afs_check_permit_rcu()
329 			return !permits->invalidated;  in afs_check_permit_rcu()
345 	struct afs_permits *permits;  in afs_check_permit()  local
352 	/* check the permits to see if we've got one yet */  in afs_check_permit()
359 		permits = rcu_dereference(vnode->permit_cache);  in afs_check_permit()
360 		if (permits) {  in afs_check_permit()
361 			for (i = 0; i < permits->nr_permits; i++) {  in afs_check_permit()
362 				if (permits->permits[i].key < key)  in afs_check_permit()
364 				if (permits->permits[i].key > key)  in afs_check_permit()
367 				*_access = permits->permits[i].access;  in afs_check_permit()
368 				valid = !permits->invalidated;  in afs_check_permit()
429 		/* check the permits to see if we've got one yet */  in afs_permission()