61 	int (*handler)(struct cachefiles_cache *cache, char *args);
87  * Prepare a cache for caching.
91 	struct cachefiles_cache *cache;  in cachefiles_daemon_open()  local
103 	/* allocate a cache record */  in cachefiles_daemon_open()
104 	cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL);  in cachefiles_daemon_open()
105 	if (!cache) {  in cachefiles_daemon_open()
110 	mutex_init(&cache->daemon_mutex);  in cachefiles_daemon_open()
111 	init_waitqueue_head(&cache->daemon_pollwq);  in cachefiles_daemon_open()
112 	INIT_LIST_HEAD(&cache->volumes);  in cachefiles_daemon_open()
113 	INIT_LIST_HEAD(&cache->object_list);  in cachefiles_daemon_open()
114 	spin_lock_init(&cache->object_list_lock);  in cachefiles_daemon_open()
115 	refcount_set(&cache->unbind_pincount, 1);  in cachefiles_daemon_open()
116 	xa_init_flags(&cache->reqs, XA_FLAGS_ALLOC);  in cachefiles_daemon_open()
117 	xa_init_flags(&cache->ondemand_ids, XA_FLAGS_ALLOC1);  in cachefiles_daemon_open()
124 	cache->frun_percent = 7;  in cachefiles_daemon_open()
125 	cache->fcull_percent = 5;  in cachefiles_daemon_open()
126 	cache->fstop_percent = 1;  in cachefiles_daemon_open()
127 	cache->brun_percent = 7;  in cachefiles_daemon_open()
128 	cache->bcull_percent = 5;  in cachefiles_daemon_open()
129 	cache->bstop_percent = 1;  in cachefiles_daemon_open()
131 	file->private_data = cache;  in cachefiles_daemon_open()
132 	cache->cachefilesd = file;  in cachefiles_daemon_open()
136 void cachefiles_flush_reqs(struct cachefiles_cache *cache)  in cachefiles_flush_reqs()  argument
138 	struct xarray *xa = &cache->reqs;  in cachefiles_flush_reqs()
166 	xa_destroy(&cache->reqs);  in cachefiles_flush_reqs()
167 	xa_destroy(&cache->ondemand_ids);  in cachefiles_flush_reqs()
170 void cachefiles_put_unbind_pincount(struct cachefiles_cache *cache)  in cachefiles_put_unbind_pincount()  argument
172 	if (refcount_dec_and_test(&cache->unbind_pincount)) {  in cachefiles_put_unbind_pincount()
173 		cachefiles_daemon_unbind(cache);  in cachefiles_put_unbind_pincount()
175 		kfree(cache);  in cachefiles_put_unbind_pincount()
179 void cachefiles_get_unbind_pincount(struct cachefiles_cache *cache)  in cachefiles_get_unbind_pincount()  argument
181 	refcount_inc(&cache->unbind_pincount);  in cachefiles_get_unbind_pincount()
185  * Release a cache.
189 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_release()  local
193 	ASSERT(cache);  in cachefiles_daemon_release()
195 	set_bit(CACHEFILES_DEAD, &cache->flags);  in cachefiles_daemon_release()
197 	if (cachefiles_in_ondemand_mode(cache))  in cachefiles_daemon_release()
198 		cachefiles_flush_reqs(cache);  in cachefiles_daemon_release()
201 	cache->cachefilesd = NULL;  in cachefiles_daemon_release()
204 	cachefiles_put_unbind_pincount(cache);  in cachefiles_daemon_release()
210 static ssize_t cachefiles_do_daemon_read(struct cachefiles_cache *cache,  in cachefiles_do_daemon_read()  argument
218 	/* check how much space the cache has */  in cachefiles_do_daemon_read()
219 	cachefiles_has_space(cache, 0, 0, cachefiles_has_space_check);  in cachefiles_do_daemon_read()
222 	f_released = atomic_xchg(&cache->f_released, 0);  in cachefiles_do_daemon_read()
223 	b_released = atomic_long_xchg(&cache->b_released, 0);  in cachefiles_do_daemon_read()
224 	clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);  in cachefiles_do_daemon_read()
236 		     test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',  in cachefiles_do_daemon_read()
237 		     (unsigned long long) cache->frun,  in cachefiles_do_daemon_read()
238 		     (unsigned long long) cache->fcull,  in cachefiles_do_daemon_read()
239 		     (unsigned long long) cache->fstop,  in cachefiles_do_daemon_read()
240 		     (unsigned long long) cache->brun,  in cachefiles_do_daemon_read()
241 		     (unsigned long long) cache->bcull,  in cachefiles_do_daemon_read()
242 		     (unsigned long long) cache->bstop,  in cachefiles_do_daemon_read()
256  * Read the cache state.
261 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_read()  local
265 	if (!test_bit(CACHEFILES_READY, &cache->flags))  in cachefiles_daemon_read()
268 	if (cachefiles_in_ondemand_mode(cache))  in cachefiles_daemon_read()
269 		return cachefiles_ondemand_daemon_read(cache, _buffer, buflen);  in cachefiles_daemon_read()
271 		return cachefiles_do_daemon_read(cache, _buffer, buflen);  in cachefiles_daemon_read()
283 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_write()  local
289 	ASSERT(cache);  in cachefiles_daemon_write()
291 	if (test_bit(CACHEFILES_DEAD, &cache->flags))  in cachefiles_daemon_write()
339 	mutex_lock(&cache->daemon_mutex);  in cachefiles_daemon_write()
342 	if (!test_bit(CACHEFILES_DEAD, &cache->flags))  in cachefiles_daemon_write()
343 		ret = cmd->handler(cache, args);  in cachefiles_daemon_write()
345 	mutex_unlock(&cache->daemon_mutex);  in cachefiles_daemon_write()
359 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_poll()  local
360 	XA_STATE(xas, &cache->reqs, 0);  in cachefiles_daemon_poll()
364 	poll_wait(file, &cache->daemon_pollwq, poll);  in cachefiles_daemon_poll()
367 	if (cachefiles_in_ondemand_mode(cache)) {  in cachefiles_daemon_poll()
368 		if (!xa_empty(&cache->reqs)) {  in cachefiles_daemon_poll()
379 		if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))  in cachefiles_daemon_poll()
383 	if (test_bit(CACHEFILES_CULLING, &cache->flags))  in cachefiles_daemon_poll()
390  * Give a range error for cache space constraints
393 static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,  in cachefiles_daemon_range_error()  argument
405 static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_frun()  argument
418 	if (frun <= cache->fcull_percent || frun >= 100)  in cachefiles_daemon_frun()
419 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_frun()
421 	cache->frun_percent = frun;  in cachefiles_daemon_frun()
429 static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_fcull()  argument
442 	if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)  in cachefiles_daemon_fcull()
443 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_fcull()
445 	cache->fcull_percent = fcull;  in cachefiles_daemon_fcull()
453 static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_fstop()  argument
466 	if (fstop >= cache->fcull_percent)  in cachefiles_daemon_fstop()
467 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_fstop()
469 	cache->fstop_percent = fstop;  in cachefiles_daemon_fstop()
477 static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_brun()  argument
490 	if (brun <= cache->bcull_percent || brun >= 100)  in cachefiles_daemon_brun()
491 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_brun()
493 	cache->brun_percent = brun;  in cachefiles_daemon_brun()
501 static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bcull()  argument
514 	if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)  in cachefiles_daemon_bcull()
515 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_bcull()
517 	cache->bcull_percent = bcull;  in cachefiles_daemon_bcull()
525 static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bstop()  argument
538 	if (bstop >= cache->bcull_percent)  in cachefiles_daemon_bstop()
539 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_bstop()
541 	cache->bstop_percent = bstop;  in cachefiles_daemon_bstop()
546  * Set the cache directory
549 static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_dir()  argument
560 	if (cache->rootdirname) {  in cachefiles_daemon_dir()
561 		pr_err("Second cache directory specified\n");  in cachefiles_daemon_dir()
569 	cache->rootdirname = dir;  in cachefiles_daemon_dir()
574  * Set the cache security context
577 static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_secctx()  argument
588 	if (cache->secctx) {  in cachefiles_daemon_secctx()
597 	cache->secctx = secctx;  in cachefiles_daemon_secctx()
602  * Set the cache tag
605 static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_tag()  argument
616 	if (cache->tag)  in cachefiles_daemon_tag()
623 	cache->tag = tag;  in cachefiles_daemon_tag()
628  * Request a node in the cache be culled from the current working directory
631 static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_cull()  argument
642 	if (!test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_cull()
643 		pr_err("cull applied to unready cache\n");  in cachefiles_daemon_cull()
647 	if (test_bit(CACHEFILES_DEAD, &cache->flags)) {  in cachefiles_daemon_cull()
648 		pr_err("cull applied to dead cache\n");  in cachefiles_daemon_cull()
657 	cachefiles_begin_secure(cache, &saved_cred);  in cachefiles_daemon_cull()
658 	ret = cachefiles_cull(cache, path.dentry, args);  in cachefiles_daemon_cull()
659 	cachefiles_end_secure(cache, saved_cred);  in cachefiles_daemon_cull()
679 static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_debug()  argument
702 static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_inuse()  argument
713 	if (!test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_inuse()
714 		pr_err("inuse applied to unready cache\n");  in cachefiles_daemon_inuse()
718 	if (test_bit(CACHEFILES_DEAD, &cache->flags)) {  in cachefiles_daemon_inuse()
719 		pr_err("inuse applied to dead cache\n");  in cachefiles_daemon_inuse()
728 	cachefiles_begin_secure(cache, &saved_cred);  in cachefiles_daemon_inuse()
729 	ret = cachefiles_check_in_use(cache, path.dentry, args);  in cachefiles_daemon_inuse()
730 	cachefiles_end_secure(cache, saved_cred);  in cachefiles_daemon_inuse()
747  * Bind a directory as a cache
749 static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bind()  argument
752 	       cache->frun_percent,  in cachefiles_daemon_bind()
753 	       cache->fcull_percent,  in cachefiles_daemon_bind()
754 	       cache->fstop_percent,  in cachefiles_daemon_bind()
755 	       cache->brun_percent,  in cachefiles_daemon_bind()
756 	       cache->bcull_percent,  in cachefiles_daemon_bind()
757 	       cache->bstop_percent,  in cachefiles_daemon_bind()
760 	if (cache->fstop_percent >= cache->fcull_percent ||  in cachefiles_daemon_bind()
761 	    cache->fcull_percent >= cache->frun_percent ||  in cachefiles_daemon_bind()
762 	    cache->frun_percent  >= 100)  in cachefiles_daemon_bind()
765 	if (cache->bstop_percent >= cache->bcull_percent ||  in cachefiles_daemon_bind()
766 	    cache->bcull_percent >= cache->brun_percent ||  in cachefiles_daemon_bind()
767 	    cache->brun_percent  >= 100)  in cachefiles_daemon_bind()
770 	if (!cache->rootdirname) {  in cachefiles_daemon_bind()
771 		pr_err("No cache directory specified\n");  in cachefiles_daemon_bind()
776 	if (test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_bind()
777 		pr_err("Cache already bound\n");  in cachefiles_daemon_bind()
783 			set_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags);  in cachefiles_daemon_bind()
794 	if (!cache->tag) {  in cachefiles_daemon_bind()
799 		cache->tag = kstrdup("CacheFiles", GFP_KERNEL);  in cachefiles_daemon_bind()
800 		if (!cache->tag)  in cachefiles_daemon_bind()
804 	return cachefiles_add_cache(cache);  in cachefiles_daemon_bind()
808  * Unbind a cache.
810 static void cachefiles_daemon_unbind(struct cachefiles_cache *cache)  in cachefiles_daemon_unbind()  argument
814 	if (test_bit(CACHEFILES_READY, &cache->flags))  in cachefiles_daemon_unbind()
815 		cachefiles_withdraw_cache(cache);  in cachefiles_daemon_unbind()
817 	cachefiles_put_directory(cache->graveyard);  in cachefiles_daemon_unbind()
818 	cachefiles_put_directory(cache->store);  in cachefiles_daemon_unbind()
819 	mntput(cache->mnt);  in cachefiles_daemon_unbind()
820 	put_cred(cache->cache_cred);  in cachefiles_daemon_unbind()
822 	kfree(cache->rootdirname);  in cachefiles_daemon_unbind()
823 	kfree(cache->secctx);  in cachefiles_daemon_unbind()
824 	kfree(cache->tag);  in cachefiles_daemon_unbind()