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 static void cachefiles_flush_reqs(struct cachefiles_cache *cache)  in cachefiles_flush_reqs()  argument
138 	struct xarray *xa = &cache->reqs;  in cachefiles_flush_reqs()
165 	xa_destroy(&cache->reqs);  in cachefiles_flush_reqs()
166 	xa_destroy(&cache->ondemand_ids);  in cachefiles_flush_reqs()
169 void cachefiles_put_unbind_pincount(struct cachefiles_cache *cache)  in cachefiles_put_unbind_pincount()  argument
171 	if (refcount_dec_and_test(&cache->unbind_pincount)) {  in cachefiles_put_unbind_pincount()
172 		cachefiles_daemon_unbind(cache);  in cachefiles_put_unbind_pincount()
174 		kfree(cache);  in cachefiles_put_unbind_pincount()
178 void cachefiles_get_unbind_pincount(struct cachefiles_cache *cache)  in cachefiles_get_unbind_pincount()  argument
180 	refcount_inc(&cache->unbind_pincount);  in cachefiles_get_unbind_pincount()
184  * Release a cache.
188 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_release()  local
192 	ASSERT(cache);  in cachefiles_daemon_release()
194 	set_bit(CACHEFILES_DEAD, &cache->flags);  in cachefiles_daemon_release()
196 	if (cachefiles_in_ondemand_mode(cache))  in cachefiles_daemon_release()
197 		cachefiles_flush_reqs(cache);  in cachefiles_daemon_release()
200 	cache->cachefilesd = NULL;  in cachefiles_daemon_release()
203 	cachefiles_put_unbind_pincount(cache);  in cachefiles_daemon_release()
209 static ssize_t cachefiles_do_daemon_read(struct cachefiles_cache *cache,  in cachefiles_do_daemon_read()  argument
217 	/* check how much space the cache has */  in cachefiles_do_daemon_read()
218 	cachefiles_has_space(cache, 0, 0, cachefiles_has_space_check);  in cachefiles_do_daemon_read()
221 	f_released = atomic_xchg(&cache->f_released, 0);  in cachefiles_do_daemon_read()
222 	b_released = atomic_long_xchg(&cache->b_released, 0);  in cachefiles_do_daemon_read()
223 	clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);  in cachefiles_do_daemon_read()
235 		     test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',  in cachefiles_do_daemon_read()
236 		     (unsigned long long) cache->frun,  in cachefiles_do_daemon_read()
237 		     (unsigned long long) cache->fcull,  in cachefiles_do_daemon_read()
238 		     (unsigned long long) cache->fstop,  in cachefiles_do_daemon_read()
239 		     (unsigned long long) cache->brun,  in cachefiles_do_daemon_read()
240 		     (unsigned long long) cache->bcull,  in cachefiles_do_daemon_read()
241 		     (unsigned long long) cache->bstop,  in cachefiles_do_daemon_read()
255  * Read the cache state.
260 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_read()  local
264 	if (!test_bit(CACHEFILES_READY, &cache->flags))  in cachefiles_daemon_read()
267 	if (cachefiles_in_ondemand_mode(cache))  in cachefiles_daemon_read()
268 		return cachefiles_ondemand_daemon_read(cache, _buffer, buflen);  in cachefiles_daemon_read()
270 		return cachefiles_do_daemon_read(cache, _buffer, buflen);  in cachefiles_daemon_read()
282 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_write()  local
288 	ASSERT(cache);  in cachefiles_daemon_write()
290 	if (test_bit(CACHEFILES_DEAD, &cache->flags))  in cachefiles_daemon_write()
338 	mutex_lock(&cache->daemon_mutex);  in cachefiles_daemon_write()
341 	if (!test_bit(CACHEFILES_DEAD, &cache->flags))  in cachefiles_daemon_write()
342 		ret = cmd->handler(cache, args);  in cachefiles_daemon_write()
344 	mutex_unlock(&cache->daemon_mutex);  in cachefiles_daemon_write()
358 	struct cachefiles_cache *cache = file->private_data;  in cachefiles_daemon_poll()  local
359 	XA_STATE(xas, &cache->reqs, 0);  in cachefiles_daemon_poll()
363 	poll_wait(file, &cache->daemon_pollwq, poll);  in cachefiles_daemon_poll()
366 	if (cachefiles_in_ondemand_mode(cache)) {  in cachefiles_daemon_poll()
367 		if (!xa_empty(&cache->reqs)) {  in cachefiles_daemon_poll()
378 		if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))  in cachefiles_daemon_poll()
382 	if (test_bit(CACHEFILES_CULLING, &cache->flags))  in cachefiles_daemon_poll()
389  * Give a range error for cache space constraints
392 static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,  in cachefiles_daemon_range_error()  argument
404 static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_frun()  argument
417 	if (frun <= cache->fcull_percent || frun >= 100)  in cachefiles_daemon_frun()
418 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_frun()
420 	cache->frun_percent = frun;  in cachefiles_daemon_frun()
428 static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_fcull()  argument
441 	if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)  in cachefiles_daemon_fcull()
442 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_fcull()
444 	cache->fcull_percent = fcull;  in cachefiles_daemon_fcull()
452 static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_fstop()  argument
465 	if (fstop >= cache->fcull_percent)  in cachefiles_daemon_fstop()
466 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_fstop()
468 	cache->fstop_percent = fstop;  in cachefiles_daemon_fstop()
476 static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_brun()  argument
489 	if (brun <= cache->bcull_percent || brun >= 100)  in cachefiles_daemon_brun()
490 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_brun()
492 	cache->brun_percent = brun;  in cachefiles_daemon_brun()
500 static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bcull()  argument
513 	if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)  in cachefiles_daemon_bcull()
514 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_bcull()
516 	cache->bcull_percent = bcull;  in cachefiles_daemon_bcull()
524 static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bstop()  argument
537 	if (bstop >= cache->bcull_percent)  in cachefiles_daemon_bstop()
538 		return cachefiles_daemon_range_error(cache, args);  in cachefiles_daemon_bstop()
540 	cache->bstop_percent = bstop;  in cachefiles_daemon_bstop()
545  * Set the cache directory
548 static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_dir()  argument
559 	if (cache->rootdirname) {  in cachefiles_daemon_dir()
560 		pr_err("Second cache directory specified\n");  in cachefiles_daemon_dir()
568 	cache->rootdirname = dir;  in cachefiles_daemon_dir()
573  * Set the cache security context
576 static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_secctx()  argument
587 	if (cache->secctx) {  in cachefiles_daemon_secctx()
596 	cache->secctx = secctx;  in cachefiles_daemon_secctx()
601  * Set the cache tag
604 static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_tag()  argument
615 	if (cache->tag)  in cachefiles_daemon_tag()
622 	cache->tag = tag;  in cachefiles_daemon_tag()
627  * Request a node in the cache be culled from the current working directory
630 static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_cull()  argument
641 	if (!test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_cull()
642 		pr_err("cull applied to unready cache\n");  in cachefiles_daemon_cull()
646 	if (test_bit(CACHEFILES_DEAD, &cache->flags)) {  in cachefiles_daemon_cull()
647 		pr_err("cull applied to dead cache\n");  in cachefiles_daemon_cull()
656 	cachefiles_begin_secure(cache, &saved_cred);  in cachefiles_daemon_cull()
657 	ret = cachefiles_cull(cache, path.dentry, args);  in cachefiles_daemon_cull()
658 	cachefiles_end_secure(cache, saved_cred);  in cachefiles_daemon_cull()
678 static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_debug()  argument
701 static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_inuse()  argument
712 	if (!test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_inuse()
713 		pr_err("inuse applied to unready cache\n");  in cachefiles_daemon_inuse()
717 	if (test_bit(CACHEFILES_DEAD, &cache->flags)) {  in cachefiles_daemon_inuse()
718 		pr_err("inuse applied to dead cache\n");  in cachefiles_daemon_inuse()
727 	cachefiles_begin_secure(cache, &saved_cred);  in cachefiles_daemon_inuse()
728 	ret = cachefiles_check_in_use(cache, path.dentry, args);  in cachefiles_daemon_inuse()
729 	cachefiles_end_secure(cache, saved_cred);  in cachefiles_daemon_inuse()
746  * Bind a directory as a cache
748 static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)  in cachefiles_daemon_bind()  argument
751 	       cache->frun_percent,  in cachefiles_daemon_bind()
752 	       cache->fcull_percent,  in cachefiles_daemon_bind()
753 	       cache->fstop_percent,  in cachefiles_daemon_bind()
754 	       cache->brun_percent,  in cachefiles_daemon_bind()
755 	       cache->bcull_percent,  in cachefiles_daemon_bind()
756 	       cache->bstop_percent,  in cachefiles_daemon_bind()
759 	if (cache->fstop_percent >= cache->fcull_percent ||  in cachefiles_daemon_bind()
760 	    cache->fcull_percent >= cache->frun_percent ||  in cachefiles_daemon_bind()
761 	    cache->frun_percent  >= 100)  in cachefiles_daemon_bind()
764 	if (cache->bstop_percent >= cache->bcull_percent ||  in cachefiles_daemon_bind()
765 	    cache->bcull_percent >= cache->brun_percent ||  in cachefiles_daemon_bind()
766 	    cache->brun_percent  >= 100)  in cachefiles_daemon_bind()
769 	if (!cache->rootdirname) {  in cachefiles_daemon_bind()
770 		pr_err("No cache directory specified\n");  in cachefiles_daemon_bind()
775 	if (test_bit(CACHEFILES_READY, &cache->flags)) {  in cachefiles_daemon_bind()
776 		pr_err("Cache already bound\n");  in cachefiles_daemon_bind()
782 			set_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags);  in cachefiles_daemon_bind()
793 	if (!cache->tag) {  in cachefiles_daemon_bind()
798 		cache->tag = kstrdup("CacheFiles", GFP_KERNEL);  in cachefiles_daemon_bind()
799 		if (!cache->tag)  in cachefiles_daemon_bind()
803 	return cachefiles_add_cache(cache);  in cachefiles_daemon_bind()
807  * Unbind a cache.
809 static void cachefiles_daemon_unbind(struct cachefiles_cache *cache)  in cachefiles_daemon_unbind()  argument
813 	if (test_bit(CACHEFILES_READY, &cache->flags))  in cachefiles_daemon_unbind()
814 		cachefiles_withdraw_cache(cache);  in cachefiles_daemon_unbind()
816 	cachefiles_put_directory(cache->graveyard);  in cachefiles_daemon_unbind()
817 	cachefiles_put_directory(cache->store);  in cachefiles_daemon_unbind()
818 	mntput(cache->mnt);  in cachefiles_daemon_unbind()
819 	put_cred(cache->cache_cred);  in cachefiles_daemon_unbind()
821 	kfree(cache->rootdirname);  in cachefiles_daemon_unbind()
822 	kfree(cache->secctx);  in cachefiles_daemon_unbind()
823 	kfree(cache->tag);  in cachefiles_daemon_unbind()