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authorIlya Dryomov <idryomov@gmail.com>2016-04-28 16:07:27 +0200
committerIlya Dryomov <idryomov@gmail.com>2016-05-26 01:15:28 +0200
commitb07d3c4bd7270c74e2b6803af8ac8a00cb3e5ed2 (patch)
treefcaa24cff4389ab2f0e7b2d2ca327fb76bdef6a7 /net
parent1907920324f1f3ebb6618344417c03a2863bba01 (diff)
downloadlinux-sh-b07d3c4bd7270c74e2b6803af8ac8a00cb3e5ed2.tar.gz
libceph: support for checking on status of watch
Implement ceph_osdc_watch_check() to be able to check on status of watch. Note that the time it takes for a watch/notify event to get delivered through the notify_wq is taken into account. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/osd_client.c52
1 files changed, 51 insertions, 1 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index e6e3ab4223db..5ac6dce74f07 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1746,6 +1746,7 @@ static void linger_release(struct kref *kref)
WARN_ON(!RB_EMPTY_NODE(&lreq->node));
WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
WARN_ON(!list_empty(&lreq->scan_item));
+ WARN_ON(!list_empty(&lreq->pending_lworks));
WARN_ON(lreq->osd);
if (lreq->reg_req)
@@ -1783,6 +1784,7 @@ linger_alloc(struct ceph_osd_client *osdc)
RB_CLEAR_NODE(&lreq->node);
RB_CLEAR_NODE(&lreq->osdc_node);
INIT_LIST_HEAD(&lreq->scan_item);
+ INIT_LIST_HEAD(&lreq->pending_lworks);
init_completion(&lreq->reg_commit_wait);
init_completion(&lreq->notify_finish_wait);
@@ -1890,6 +1892,8 @@ static void cancel_linger_request(struct ceph_osd_request *req)
struct linger_work {
struct work_struct work;
struct ceph_osd_linger_request *lreq;
+ struct list_head pending_item;
+ unsigned long queued_stamp;
union {
struct {
@@ -1916,6 +1920,7 @@ static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
return NULL;
INIT_WORK(&lwork->work, workfn);
+ INIT_LIST_HEAD(&lwork->pending_item);
lwork->lreq = linger_get(lreq);
return lwork;
@@ -1925,6 +1930,10 @@ static void lwork_free(struct linger_work *lwork)
{
struct ceph_osd_linger_request *lreq = lwork->lreq;
+ mutex_lock(&lreq->lock);
+ list_del(&lwork->pending_item);
+ mutex_unlock(&lreq->lock);
+
linger_put(lreq);
kfree(lwork);
}
@@ -1935,6 +1944,10 @@ static void lwork_queue(struct linger_work *lwork)
struct ceph_osd_client *osdc = lreq->osdc;
verify_lreq_locked(lreq);
+ WARN_ON(!list_empty(&lwork->pending_item));
+
+ lwork->queued_stamp = jiffies;
+ list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
queue_work(osdc->notify_wq, &lwork->work);
}
@@ -2116,7 +2129,9 @@ static void linger_ping_cb(struct ceph_osd_request *req)
__func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
lreq->last_error);
if (lreq->register_gen == req->r_ops[0].watch.gen) {
- if (req->r_result && !lreq->last_error) {
+ if (!req->r_result) {
+ lreq->watch_valid_thru = lreq->ping_sent;
+ } else if (!lreq->last_error) {
lreq->last_error = normalize_watch_error(req->r_result);
queue_watch_error(lreq);
}
@@ -3316,6 +3331,7 @@ ceph_osdc_watch(struct ceph_osd_client *osdc,
lreq->wcb = wcb;
lreq->errcb = errcb;
lreq->data = data;
+ lreq->watch_valid_thru = jiffies;
ceph_oid_copy(&lreq->t.base_oid, oid);
ceph_oloc_copy(&lreq->t.base_oloc, oloc);
@@ -3578,6 +3594,40 @@ out_put_lreq:
EXPORT_SYMBOL(ceph_osdc_notify);
/*
+ * Return the number of milliseconds since the watch was last
+ * confirmed, or an error. If there is an error, the watch is no
+ * longer valid, and should be destroyed with ceph_osdc_unwatch().
+ */
+int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
+ struct ceph_osd_linger_request *lreq)
+{
+ unsigned long stamp, age;
+ int ret;
+
+ down_read(&osdc->lock);
+ mutex_lock(&lreq->lock);
+ stamp = lreq->watch_valid_thru;
+ if (!list_empty(&lreq->pending_lworks)) {
+ struct linger_work *lwork =
+ list_first_entry(&lreq->pending_lworks,
+ struct linger_work,
+ pending_item);
+
+ if (time_before(lwork->queued_stamp, stamp))
+ stamp = lwork->queued_stamp;
+ }
+ age = jiffies - stamp;
+ dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
+ lreq, lreq->linger_id, age, lreq->last_error);
+ /* we are truncating to msecs, so return a safe upper bound */
+ ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);
+
+ mutex_unlock(&lreq->lock);
+ up_read(&osdc->lock);
+ return ret;
+}
+
+/*
* Call all pending notify callbacks - for use after a watch is
* unregistered, to make sure no more callbacks for it will be invoked
*/