fs/cachefiles/interface.c

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