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authorSage Weil <sage@inktank.com>2012-07-30 16:19:28 -0700
committerSage Weil <sage@inktank.com>2012-07-30 18:15:31 -0700
commit6194ea895e447fdf4adfd23f67873a32bf4f15ae (patch)
tree89a9642972fa31892a62665b13881794988f01d4 /net
parent8c50c817566dfa4581f82373aac39f3e608a7dc8 (diff)
downloadlinux-6194ea895e447fdf4adfd23f67873a32bf4f15ae.tar.gz
libceph: resubmit linger ops when pg mapping changes
The linger op registration (i.e., watch) modifies the object state. As such, the OSD will reply with success if it has already applied without doing the associated side-effects (setting up the watch session state). If we lose the ACK and resubmit, we will see success but the watch will not be correctly registered and we won't get notifies. To fix this, always resubmit the linger op with a new tid. We accomplish this by re-registering as a linger (i.e., 'registered') if we are not yet registered. Then the second loop will treat this just like a normal case of re-registering. This mirrors a similar fix on the userland ceph.git, commit 5dd68b95, and ceph bug #2796. Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com> Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/osd_client.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 07920cac31a..c605705c2f5 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -891,7 +891,9 @@ static void __register_linger_request(struct ceph_osd_client *osdc,
{
dout("__register_linger_request %p\n", req);
list_add_tail(&req->r_linger_item, &osdc->req_linger);
- list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
+ if (req->r_osd)
+ list_add_tail(&req->r_linger_osd,
+ &req->r_osd->o_linger_requests);
}
static void __unregister_linger_request(struct ceph_osd_client *osdc,
@@ -1305,8 +1307,9 @@ static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
mutex_lock(&osdc->request_mutex);
- for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
+ for (p = rb_first(&osdc->requests); p; ) {
req = rb_entry(p, struct ceph_osd_request, r_node);
+ p = rb_next(p);
err = __map_request(osdc, req, force_resend);
if (err < 0)
continue; /* error */
@@ -1314,10 +1317,23 @@ static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
dout("%p tid %llu maps to no osd\n", req, req->r_tid);
needmap++; /* request a newer map */
} else if (err > 0) {
- dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
- req->r_osd ? req->r_osd->o_osd : -1);
- if (!req->r_linger)
+ if (!req->r_linger) {
+ dout("%p tid %llu requeued on osd%d\n", req,
+ req->r_tid,
+ req->r_osd ? req->r_osd->o_osd : -1);
req->r_flags |= CEPH_OSD_FLAG_RETRY;
+ }
+ }
+ if (req->r_linger && list_empty(&req->r_linger_item)) {
+ /*
+ * register as a linger so that we will
+ * re-submit below and get a new tid
+ */
+ dout("%p tid %llu restart on osd%d\n",
+ req, req->r_tid,
+ req->r_osd ? req->r_osd->o_osd : -1);
+ __register_linger_request(osdc, req);
+ __unregister_request(osdc, req);
}
}