19  * Allocate a cache object record.
26 	struct cachefiles_object *object;  in cachefiles_alloc_object()  local
30 	object = kmem_cache_zalloc(cachefiles_object_jar, GFP_KERNEL);  in cachefiles_alloc_object()
31 	if (!object)  in cachefiles_alloc_object()
34 	if (cachefiles_ondemand_init_obj_info(object, volume)) {  in cachefiles_alloc_object()
35 		kmem_cache_free(cachefiles_object_jar, object);  in cachefiles_alloc_object()
39 	refcount_set(&object->ref, 1);  in cachefiles_alloc_object()
41 	spin_lock_init(&object->lock);  in cachefiles_alloc_object()
42 	INIT_LIST_HEAD(&object->cache_link);  in cachefiles_alloc_object()
43 	object->volume = volume;  in cachefiles_alloc_object()
44 	object->debug_id = atomic_inc_return(&cachefiles_object_debug_id);  in cachefiles_alloc_object()
45 	object->cookie = fscache_get_cookie(cookie, fscache_cookie_get_attach_object);  in cachefiles_alloc_object()
48 	trace_cachefiles_ref(object->debug_id, cookie->debug_id, 1,  in cachefiles_alloc_object()
50 	return object;  in cachefiles_alloc_object()
54  * Note that an object has been seen.
56 void cachefiles_see_object(struct cachefiles_object *object,  in cachefiles_see_object()  argument
59 	trace_cachefiles_ref(object->debug_id, object->cookie->debug_id,  in cachefiles_see_object()
60 			     refcount_read(&object->ref), why);  in cachefiles_see_object()
64  * Increment the usage count on an object;
66 struct cachefiles_object *cachefiles_grab_object(struct cachefiles_object *object,  in cachefiles_grab_object()  argument
71 	__refcount_inc(&object->ref, &r);  in cachefiles_grab_object()
72 	trace_cachefiles_ref(object->debug_id, object->cookie->debug_id, r, why);  in cachefiles_grab_object()
73 	return object;  in cachefiles_grab_object()
77  * dispose of a reference to an object
79 void cachefiles_put_object(struct cachefiles_object *object,  in cachefiles_put_object()  argument
82 	unsigned int object_debug_id = object->debug_id;  in cachefiles_put_object()
83 	unsigned int cookie_debug_id = object->cookie->debug_id;  in cachefiles_put_object()
88 	done = __refcount_dec_and_test(&object->ref, &r);  in cachefiles_put_object()
91 		_debug("- kill object OBJ%x", object_debug_id);  in cachefiles_put_object()
93 		ASSERTCMP(object->file, ==, NULL);  in cachefiles_put_object()
95 		kfree(object->d_name);  in cachefiles_put_object()
96 		cachefiles_ondemand_deinit_obj_info(object);  in cachefiles_put_object()
97 		cache = object->volume->cache->cache;  in cachefiles_put_object()
98 		fscache_put_cookie(object->cookie, fscache_cookie_put_object);  in cachefiles_put_object()
99 		object->cookie = NULL;  in cachefiles_put_object()
100 		kmem_cache_free(cachefiles_object_jar, object);  in cachefiles_put_object()
114 static int cachefiles_adjust_size(struct cachefiles_object *object)  in cachefiles_adjust_size()  argument
117 	struct file *file = object->file;  in cachefiles_adjust_size()
122 	ni_size = object->cookie->object_size;  in cachefiles_adjust_size()
126 	       object->debug_id, (unsigned long long) ni_size);  in cachefiles_adjust_size()
166 		cachefiles_io_error_obj(object, "Size set failed");  in cachefiles_adjust_size()
179 	struct cachefiles_object *object;  in cachefiles_lookup_cookie()  local
184 	object = cachefiles_alloc_object(cookie);  in cachefiles_lookup_cookie()
185 	if (!object)  in cachefiles_lookup_cookie()
188 	_enter("{OBJ%x}", object->debug_id);  in cachefiles_lookup_cookie()
190 	if (!cachefiles_cook_key(object))  in cachefiles_lookup_cookie()
193 	cookie->cache_priv = object;  in cachefiles_lookup_cookie()
197 	success = cachefiles_look_up_object(object);  in cachefiles_lookup_cookie()
201 	cachefiles_see_object(object, cachefiles_obj_see_lookup_cookie);  in cachefiles_lookup_cookie()
204 	list_add(&object->cache_link, &cache->object_list);  in cachefiles_lookup_cookie()
206 	cachefiles_adjust_size(object);  in cachefiles_lookup_cookie()
214 	cachefiles_see_object(object, cachefiles_obj_see_lookup_failed);  in cachefiles_lookup_cookie()
216 	_debug("failed c=%08x o=%08x", cookie->debug_id, object->debug_id);  in cachefiles_lookup_cookie()
218 	 * drop it before we can withdraw the object.  in cachefiles_lookup_cookie()
223 	cachefiles_put_object(object, cachefiles_obj_put_alloc_fail);  in cachefiles_lookup_cookie()
229  * Shorten the backing object to discard any dirty data and free up
232 static bool cachefiles_shorten_object(struct cachefiles_object *object,  in cachefiles_shorten_object()  argument
235 	struct cachefiles_cache *cache = object->volume->cache;  in cachefiles_shorten_object()
243 	trace_cachefiles_trunc(object, inode, i_size, dio_size,  in cachefiles_shorten_object()
249 		trace_cachefiles_io_error(object, file_inode(file), ret,  in cachefiles_shorten_object()
251 		cachefiles_io_error_obj(object, "Trunc-to-size failed %d", ret);  in cachefiles_shorten_object()
252 		cachefiles_remove_object_xattr(cache, object, file->f_path.dentry);  in cachefiles_shorten_object()
257 		trace_cachefiles_trunc(object, inode, dio_size, new_size,  in cachefiles_shorten_object()
264 			trace_cachefiles_io_error(object, file_inode(file), ret,  in cachefiles_shorten_object()
266 			cachefiles_io_error_obj(object, "Trunc-to-dio-size failed %d", ret);  in cachefiles_shorten_object()
267 			cachefiles_remove_object_xattr(cache, object, file->f_path.dentry);  in cachefiles_shorten_object()
276  * Resize the backing object.
281 	struct cachefiles_object *object = cachefiles_cres_object(cres);  in cachefiles_resize_cookie()  local
282 	struct cachefiles_cache *cache = object->volume->cache;  in cachefiles_resize_cookie()
283 	struct fscache_cookie *cookie = object->cookie;  in cachefiles_resize_cookie()
292 		cachefiles_shorten_object(object, file, new_size);  in cachefiles_resize_cookie()
294 		object->cookie->object_size = new_size;  in cachefiles_resize_cookie()
306  * Commit changes to the object as we drop it.
308 static void cachefiles_commit_object(struct cachefiles_object *object,  in cachefiles_commit_object()  argument
313 	if (test_and_clear_bit(FSCACHE_COOKIE_LOCAL_WRITE, &object->cookie->flags))  in cachefiles_commit_object()
315 	if (test_and_clear_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags))  in cachefiles_commit_object()
318 		cachefiles_set_object_xattr(object);  in cachefiles_commit_object()
320 	if (test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags))  in cachefiles_commit_object()
321 		cachefiles_commit_tmpfile(cache, object);  in cachefiles_commit_object()
325  * Finalise and object and close the VFS structs that we have.
327 static void cachefiles_clean_up_object(struct cachefiles_object *object,  in cachefiles_clean_up_object()  argument
330 	if (test_bit(FSCACHE_COOKIE_RETIRED, &object->cookie->flags)) {  in cachefiles_clean_up_object()
331 		if (!test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags)) {  in cachefiles_clean_up_object()
332 			cachefiles_see_object(object, cachefiles_obj_see_clean_delete);  in cachefiles_clean_up_object()
333 			_debug("- inval object OBJ%x", object->debug_id);  in cachefiles_clean_up_object()
334 			cachefiles_delete_object(object, FSCACHE_OBJECT_WAS_RETIRED);  in cachefiles_clean_up_object()
336 			cachefiles_see_object(object, cachefiles_obj_see_clean_drop_tmp);  in cachefiles_clean_up_object()
337 			_debug("- inval object OBJ%x tmpfile", object->debug_id);  in cachefiles_clean_up_object()
340 		cachefiles_see_object(object, cachefiles_obj_see_clean_commit);  in cachefiles_clean_up_object()
341 		cachefiles_commit_object(object, cache);  in cachefiles_clean_up_object()
344 	cachefiles_unmark_inode_in_use(object, object->file);  in cachefiles_clean_up_object()
345 	if (object->file) {  in cachefiles_clean_up_object()
346 		fput(object->file);  in cachefiles_clean_up_object()
347 		object->file = NULL;  in cachefiles_clean_up_object()
356 	struct cachefiles_object *object = cookie->cache_priv;  in cachefiles_withdraw_cookie()  local
357 	struct cachefiles_cache *cache = object->volume->cache;  in cachefiles_withdraw_cookie()
360 	_enter("o=%x", object->debug_id);  in cachefiles_withdraw_cookie()
361 	cachefiles_see_object(object, cachefiles_obj_see_withdraw_cookie);  in cachefiles_withdraw_cookie()
363 	if (!list_empty(&object->cache_link)) {  in cachefiles_withdraw_cookie()
365 		cachefiles_see_object(object, cachefiles_obj_see_withdrawal);  in cachefiles_withdraw_cookie()
366 		list_del_init(&object->cache_link);  in cachefiles_withdraw_cookie()
370 	cachefiles_ondemand_clean_object(object);  in cachefiles_withdraw_cookie()
372 	if (object->file) {  in cachefiles_withdraw_cookie()
374 		cachefiles_clean_up_object(object, cache);  in cachefiles_withdraw_cookie()
379 	cachefiles_put_object(object, cachefiles_obj_put_detach);  in cachefiles_withdraw_cookie()
387 	struct cachefiles_object *object = cookie->cache_priv;  in cachefiles_invalidate_cookie()  local
391 	_enter("o=%x,[%llu]", object->debug_id, object->cookie->object_size);  in cachefiles_invalidate_cookie()
393 	old_tmpfile = test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags);  in cachefiles_invalidate_cookie()
395 	if (!object->file) {  in cachefiles_invalidate_cookie()
401 	new_file = cachefiles_create_tmpfile(object);  in cachefiles_invalidate_cookie()
407 	spin_lock(&object->lock);  in cachefiles_invalidate_cookie()
409 	old_file = object->file;  in cachefiles_invalidate_cookie()
410 	object->file = new_file;  in cachefiles_invalidate_cookie()
411 	object->content_info = CACHEFILES_CONTENT_NO_DATA;  in cachefiles_invalidate_cookie()
412 	set_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags);  in cachefiles_invalidate_cookie()
413 	set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags);  in cachefiles_invalidate_cookie()
415 	spin_unlock(&object->lock);  in cachefiles_invalidate_cookie()
423 			struct cachefiles_volume *volume = object->volume;  in cachefiles_invalidate_cookie()
427 			cachefiles_bury_object(volume->cache, object, fan,  in cachefiles_invalidate_cookie()