[PATCH v3 6/9] cachefiles: cancel all requests for the object that is being dropped

[libaokun@huaweicloud.com]

From: Baokun Li <libaokun1@huawei.com>

Because after an object is dropped, requests for that object are useless,
cancel them to avoid causing other problems.

This prepares for the later addition of cancel_work_sync(). After the
reopen requests is generated, cancel it to avoid cancel_work_sync()
blocking by waiting for daemon to complete the reopen requests.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
---
 fs/cachefiles/ondemand.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index 8a3b52c3ebba..36b97ded16b4 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -669,12 +669,31 @@ int cachefiles_ondemand_init_object(struct cachefiles_object *object)
 
 void cachefiles_ondemand_clean_object(struct cachefiles_object *object)
 {
+	unsigned long index;
+	struct cachefiles_req *req;
+	struct cachefiles_cache *cache;
+
 	if (!object->ondemand)
 		return;
 
 	cachefiles_ondemand_send_req(object, CACHEFILES_OP_CLOSE, 0,
 			cachefiles_ondemand_init_close_req, NULL);
+
+	if (!object->ondemand->ondemand_id)
+		return;
+
+	/* Cancel all requests for the object that is being dropped. */
+	cache = object->volume->cache;
+	xa_lock(&cache->reqs);
 	cachefiles_ondemand_set_object_dropping(object);
+	xa_for_each(&cache->reqs, index, req) {
+		if (req->object == object) {
+			req->error = -EIO;
+			complete(&req->done);
+			__xa_erase(&cache->reqs, index);
+		}
+	}
+	xa_unlock(&cache->reqs);
 }
 
 int cachefiles_ondemand_init_obj_info(struct cachefiles_object *object,
-- 
2.39.2