62 	int (*handler)(struct cachefiles_cache *cache, char *args);
88  * Prepare a cache for caching.
92 	struct cachefiles_cache *cache;  in cachefiles_daemon_open()  local
104 	/* allocate a cache record */  in cachefiles_daemon_open()
105 	cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL);  in cachefiles_daemon_open()
106 	if (!cache) {  in cachefiles_daemon_open()
111 	mutex_init(&cache->daemon_mutex);  in cachefiles_daemon_open()
112 	init_waitqueue_head(&cache->daemon_pollwq);  in cachefiles_daemon_open()
113 	INIT_LIST_HEAD(&cache->volumes);  in cachefiles_daemon_open()
114 	INIT_LIST_HEAD(&cache->object_list);  in cachefiles_daemon_open()
115 	spin_lock_init(&cache->object_list_lock);  in cachefiles_daemon_open()
116 	refcount_set(&cache->unbind_pincount, 1);  in cachefiles_daemon_open()
117 	xa_init_flags(&cache->reqs, XA_FLAGS_ALLOC);  in cachefiles_daemon_open()
118 	xa_init_flags(&cache->ondemand_ids, XA_FLAGS_ALLOC1);  in cachefiles_daemon_open()
125 	cache->frun_percent = 7;  in cachefiles_daemon_open()
126 	cache->fcull_percent = 5;  in cachefiles_daemon_open()
127 	cache->fstop_percent = 1;  in cachefiles_daemon_open()
128 	cache->brun_percent = 7;  in cachefiles_daemon_open()
129 	cache->bcull_percent = 5;  in cachefiles_daemon_open()
130 	cache->bstop_percent = 1;  in cachefiles_daemon_open()
132 	file->private_data = cache;  in cachefiles_daemon_open()
133 	cache->cachefilesd = file;  in cachefiles_daemon_open()
137 void cachefiles_flush_reqs(struct cachefiles_cache *cache)  in cachefiles_flush_reqs()  argument
139 	struct xarray *xa = &cache->reqs;  in cachefiles_flush_reqs()
167 	xa_destroy(&cache->reqs);  in cachefiles_flush_reqs()
168 	xa_destroy(&cache->ondemand_ids);  in cachefiles_flush_reqs()
171 void cachefiles_put_unbind_pincount(struct cachefiles_cache *cache)  in cachefiles_put_unbind_pincount()  argument
173 	if (refcount_dec_and_test(&cache->unbind_pincount)) {  in cachefiles_put_unbind_pincount()
174 		cachefiles_daemon_unbind(cache);  in cachefiles_put_unbind_pincount()
176 		kfree(cache);  in cachefiles_put_unbind_pincount()
180 void cachefiles_get_unbind_pincount(struct cachefiles_cache *cache)  in cachefiles_get_unbind_pincount()  argument
182 	refcount_inc(&cache->unbind_pincount);  in cachefiles_get_unbind_pincount()
186  * Release a cache.
190 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_release()  local
194 	ASSERT(cache);  in cachefiles_daemon_release()
196 	set_bit(CACHEFILES_DEAD, &cache->flags);  in cachefiles_daemon_release()
198 	if (cachefiles_in_ondemand_mode(cache))  in cachefiles_daemon_release()
199 		cachefiles_flush_reqs(cache);  in cachefiles_daemon_release()
202 	cache->cachefilesd = NULL;  in cachefiles_daemon_release()
205 	cachefiles_put_unbind_pincount(cache);  in cachefiles_daemon_release()
211 static ssize_t cachefiles_do_daemon_read(struct cachefiles_cache *cache,  in cachefiles_do_daemon_read()  argument
219 	/* check how much space the cache has */  in cachefiles_do_daemon_read()
220 	cachefiles_has_space(cache, 0, 0, cachefiles_has_space_check);  in cachefiles_do_daemon_read()
223 	f_released = atomic_xchg(&cache->f_released, 0);  in cachefiles_do_daemon_read()
224 	b_released = atomic_long_xchg(&cache->b_released, 0);  in cachefiles_do_daemon_read()
225 	clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);  in cachefiles_do_daemon_read()
237 		     test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',  in cachefiles_do_daemon_read()
238 		     (unsigned long long) cache->frun,  in cachefiles_do_daemon_read()
239 		     (unsigned long long) cache->fcull,  in cachefiles_do_daemon_read()
240 		     (unsigned long long) cache->fstop,  in cachefiles_do_daemon_read()
241 		     (unsigned long long) cache->brun,  in cachefiles_do_daemon_read()
242 		     (unsigned long long) cache->bcull,  in cachefiles_do_daemon_read()
243 		     (unsigned long long) cache->bstop,  in cachefiles_do_daemon_read()
257  * Read the cache state.
262 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_read()  local
266 	if (!test_bit(CACHEFILES_READY, &cache->flags))  in cachefiles_daemon_read()
269 	if (cachefiles_in_ondemand_mode(cache))  in cachefiles_daemon_read()
270 		return cachefiles_ondemand_daemon_read(cache, _buffer, buflen);  in cachefiles_daemon_read()
272 		return cachefiles_do_daemon_read(cache, _buffer, buflen);  in cachefiles_daemon_read()
284 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_write()  local
290 	ASSERT(cache);  in cachefiles_daemon_write()
292 	if (test_bit(CACHEFILES_DEAD, &cache->flags))  in cachefiles_daemon_write()
340 	mutex_lock(&cache->daemon_mutex);  in cachefiles_daemon_write()
343 	if (!test_bit(CACHEFILES_DEAD, &cache->flags))  in cachefiles_daemon_write()
344 		ret = cmd->handler(cache, args);  in cachefiles_daemon_write()
346 	mutex_unlock(&cache->daemon_mutex);  in cachefiles_daemon_write()
360 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_poll()  local
361 	XA_STATE(xas, &cache->reqs, 0);  in cachefiles_daemon_poll()
365 	poll_wait(file, &cache->daemon_pollwq, poll);  in cachefiles_daemon_poll()
368 	if (cachefiles_in_ondemand_mode(cache)) {  in cachefiles_daemon_poll()
369 		if (!xa_empty(&cache->reqs)) {  in cachefiles_daemon_poll()
380 		if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))  in cachefiles_daemon_poll()
384 	if (test_bit(CACHEFILES_CULLING, &cache->flags))  in cachefiles_daemon_poll()
391  * Give a range error for cache space constraints
394 static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,  in cachefiles_daemon_range_error()  argument
406 static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_frun()  argument
419 	if (frun <= cache->fcull_percent || frun >= 100)  in cachefiles_daemon_frun()
420 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_frun()
422 	cache->frun_percent = frun;  in cachefiles_daemon_frun()
430 static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_fcull()  argument
443 	if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)  in cachefiles_daemon_fcull()
444 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_fcull()
446 	cache->fcull_percent = fcull;  in cachefiles_daemon_fcull()
454 static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_fstop()  argument
467 	if (fstop >= cache->fcull_percent)  in cachefiles_daemon_fstop()
468 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_fstop()
470 	cache->fstop_percent = fstop;  in cachefiles_daemon_fstop()
478 static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_brun()  argument
491 	if (brun <= cache->bcull_percent || brun >= 100)  in cachefiles_daemon_brun()
492 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_brun()
494 	cache->brun_percent = brun;  in cachefiles_daemon_brun()
502 static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bcull()  argument
515 	if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)  in cachefiles_daemon_bcull()
516 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_bcull()
518 	cache->bcull_percent = bcull;  in cachefiles_daemon_bcull()
526 static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bstop()  argument
539 	if (bstop >= cache->bcull_percent)  in cachefiles_daemon_bstop()
540 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_bstop()
542 	cache->bstop_percent = bstop;  in cachefiles_daemon_bstop()
547  * Set the cache directory
550 static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_dir()  argument
561 	if (cache->rootdirname) {  in cachefiles_daemon_dir()
562 		pr_err("Second cache directory specified\n");  in cachefiles_daemon_dir()
570 	cache->rootdirname = dir;  in cachefiles_daemon_dir()
575  * Set the cache security context
578 static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_secctx()  argument
589 	if (cache->have_secid) {  in cachefiles_daemon_secctx()
594 	err = security_secctx_to_secid(args, strlen(args), &cache->secid);  in cachefiles_daemon_secctx()
598 	cache->have_secid = true;  in cachefiles_daemon_secctx()
603  * Set the cache tag
606 static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_tag()  argument
617 	if (cache->tag)  in cachefiles_daemon_tag()
624 	cache->tag = tag;  in cachefiles_daemon_tag()
629  * Request a node in the cache be culled from the current working directory
632 static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_cull()  argument
643 	if (!test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_cull()
644 		pr_err("cull applied to unready cache\n");  in cachefiles_daemon_cull()
648 	if (test_bit(CACHEFILES_DEAD, &cache->flags)) {  in cachefiles_daemon_cull()
649 		pr_err("cull applied to dead cache\n");  in cachefiles_daemon_cull()
658 	cachefiles_begin_secure(cache, &saved_cred);  in cachefiles_daemon_cull()
659 	ret = cachefiles_cull(cache, path.dentry, args);  in cachefiles_daemon_cull()
660 	cachefiles_end_secure(cache, saved_cred);  in cachefiles_daemon_cull()
680 static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_debug()  argument
703 static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_inuse()  argument
714 	if (!test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_inuse()
715 		pr_err("inuse applied to unready cache\n");  in cachefiles_daemon_inuse()
719 	if (test_bit(CACHEFILES_DEAD, &cache->flags)) {  in cachefiles_daemon_inuse()
720 		pr_err("inuse applied to dead cache\n");  in cachefiles_daemon_inuse()
729 	cachefiles_begin_secure(cache, &saved_cred);  in cachefiles_daemon_inuse()
730 	ret = cachefiles_check_in_use(cache, path.dentry, args);  in cachefiles_daemon_inuse()
731 	cachefiles_end_secure(cache, saved_cred);  in cachefiles_daemon_inuse()
748  * Bind a directory as a cache
750 static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bind()  argument
753 	       cache->frun_percent,  in cachefiles_daemon_bind()
754 	       cache->fcull_percent,  in cachefiles_daemon_bind()
755 	       cache->fstop_percent,  in cachefiles_daemon_bind()
756 	       cache->brun_percent,  in cachefiles_daemon_bind()
757 	       cache->bcull_percent,  in cachefiles_daemon_bind()
758 	       cache->bstop_percent,  in cachefiles_daemon_bind()
761 	if (cache->fstop_percent >= cache->fcull_percent ||  in cachefiles_daemon_bind()
762 	    cache->fcull_percent >= cache->frun_percent ||  in cachefiles_daemon_bind()
763 	    cache->frun_percent  >= 100)  in cachefiles_daemon_bind()
766 	if (cache->bstop_percent >= cache->bcull_percent ||  in cachefiles_daemon_bind()
767 	    cache->bcull_percent >= cache->brun_percent ||  in cachefiles_daemon_bind()
768 	    cache->brun_percent  >= 100)  in cachefiles_daemon_bind()
771 	if (!cache->rootdirname) {  in cachefiles_daemon_bind()
772 		pr_err("No cache directory specified\n");  in cachefiles_daemon_bind()
777 	if (test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_bind()
778 		pr_err("Cache already bound\n");  in cachefiles_daemon_bind()
784 			set_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags);  in cachefiles_daemon_bind()
795 	if (!cache->tag) {  in cachefiles_daemon_bind()
800 		cache->tag = kstrdup("CacheFiles", GFP_KERNEL);  in cachefiles_daemon_bind()
801 		if (!cache->tag)  in cachefiles_daemon_bind()
805 	return cachefiles_add_cache(cache);  in cachefiles_daemon_bind()
809  * Unbind a cache.
811 static void cachefiles_daemon_unbind(struct cachefiles_cache *cache)  in cachefiles_daemon_unbind()  argument
815 	if (test_bit(CACHEFILES_READY, &cache->flags))  in cachefiles_daemon_unbind()
816 		cachefiles_withdraw_cache(cache);  in cachefiles_daemon_unbind()
818 	cachefiles_put_directory(cache->graveyard);  in cachefiles_daemon_unbind()
819 	cachefiles_put_directory(cache->store);  in cachefiles_daemon_unbind()
820 	mntput(cache->mnt);  in cachefiles_daemon_unbind()
821 	put_cred(cache->cache_cred);  in cachefiles_daemon_unbind()
823 	kfree(cache->rootdirname);  in cachefiles_daemon_unbind()
824 	kfree(cache->tag);  in cachefiles_daemon_unbind()