From: Josh Durgin Date: Thu, 29 Aug 2013 04:43:09 +0000 (-0700) Subject: libceph: add function to ensure notifies are complete X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dd935f44a40f8fb02aff2cc0df2269c92422df1c;p=linux-beck.git libceph: add function to ensure notifies are complete Without a way to flush the osd client's notify workqueue, a watch event that is unregistered could continue receiving callbacks indefinitely. Unregistering the event simply means no new notifies are added to the queue, but there may still be events in the queue that will call the watch callback for the event. If the queue is flushed after the event is unregistered, the caller can be sure no more watch callbacks will occur for the canceled watch. Signed-off-by: Josh Durgin Reviewed-by: Sage Weil Reviewed-by: Alex Elder --- diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h index ce6df39f60ff..8f47625a0661 100644 --- a/include/linux/ceph/osd_client.h +++ b/include/linux/ceph/osd_client.h @@ -335,6 +335,8 @@ extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req); extern void ceph_osdc_sync(struct ceph_osd_client *osdc); +extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc); + extern int ceph_osdc_readpages(struct ceph_osd_client *osdc, struct ceph_vino vino, struct ceph_file_layout *layout, diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 1606f740d6ae..2b4b32aaa893 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -2215,6 +2215,17 @@ void ceph_osdc_sync(struct ceph_osd_client *osdc) } EXPORT_SYMBOL(ceph_osdc_sync); +/* + * Call all pending notify callbacks - for use after a watch is + * unregistered, to make sure no more callbacks for it will be invoked + */ +extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc) +{ + flush_workqueue(osdc->notify_wq); +} +EXPORT_SYMBOL(ceph_osdc_flush_notifies); + + /* * init, shutdown */