On 2024/6/27 19:01, Jeff Layton wrote:
On Wed, 2024-05-15 at 20:51 +0800, libaokun@xxxxxxxxxxxxxxx wrote:
From: Baokun Li <libaokun1@xxxxxxxxxx>
Because after an object is dropped, requests for that object are
useless,
flush them to avoid causing other problems.
This prepares for the later addition of cancel_work_sync(). After the
reopen requests is generated, flush it to avoid cancel_work_sync()
blocking by waiting for daemon to complete the reopen requests.
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
---
fs/cachefiles/ondemand.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index 73da4d4eaa9b..d24bff43499b 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -564,12 +564,31 @@ 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;
+
+ /* Flush all requests for the object that is being dropped.
*/
I wouldn't call this a "Flush". In the context of writeback, that
usually means that we're writing out pages now in order to do something
else. In this case, it looks like you're more canceling these requests
since you're marking them with an error and declaring them complete.
Makes sense, I'll update 'flush' to 'cancel' in the comment and subject.
I am not a native speaker of English, so some of the expressions may
not be accurate, thank you for correcting me.
Thanks,
Baokun
+ 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,
