Piteball
/
android_kernel_samsung_msm8976
mirror of https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
1
1
Fork 0
Code Issues Projects Releases Wiki Activity

libceph: request a new osdmap if lingering request maps to no osd 

commit b0494532214bdfbf241e94fabab5dd46f7b82631 upstream.

This commit does two things.  First, if there are any homeless
lingering requests, we now request a new osdmap even if the osdmap that
is being processed brought no changes, i.e. if a given lingering
request turned homeless in one of the previous epochs and remained
homeless in the current epoch.  Not doing so leaves us with a stale
osdmap and as a result we may miss our window for reestablishing the
watch and lose notifies.

MON=1 OSD=1:

    # cat linger-needmap.sh
    #!/bin/bash
    rbd create --size 1 test
    DEV=$(rbd map test)
    ceph osd out 0
    rbd map dne/dne # obtain a new osdmap as a side effect (!)
    sleep 1
    ceph osd in 0
    rbd resize --size 2 test
    # rbd info test | grep size -> 2M
    # blockdev --getsize $DEV -> 1M

N.B.: Not obtaining a new osdmap in between "osd out" and "osd in"
above is enough to make it miss that resize notify, but that is a
bug^Wlimitation of ceph watch/notify v1.

Second, homeless lingering requests are now kicked just like those
lingering requests whose mapping has changed.  This is mainly to
recognize that a homeless lingering request makes no sense and to
preserve the invariant that a registered lingering request is not
sitting on any of r_req_lru_item lists.  This spares us a WARN_ON,
which commit ba9d114ec557 ("libceph: clear r_req_lru_item in
__unregister_linger_request()") tried to fix the _wrong_ way.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilya Dryomov 2015-05-11 17:53:10 +03:00 committed by Greg Kroah-Hartman
parent 15a6585a7c
commit d2e3dbf9c3
1 changed files with 20 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
net/ceph/osd_client.c
View File

@ -1702,20 +1702,29 @@ static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
err = __map_request(osdc, req,
force_resend || force_resend_writes);
dout("__map_request returned %d\n", err);
if (err == 0)
continue; /* no change and no osd was specified */
if (err < 0)
continue; /* hrm! */
if (req->r_osd == NULL) {
dout("tid %llu maps to no valid osd\n", req->r_tid);
needmap++; /* request a newer map */
continue;
}
if (req->r_osd == NULL || err > 0) {
if (req->r_osd == NULL) {
dout("lingering %p tid %llu maps to no osd\n",
req, req->r_tid);
/*
* A homeless lingering request makes
* no sense, as it's job is to keep
* a particular OSD connection open.
* Request a newer map and kick the
* request, knowing that it won't be
* resent until we actually get a map
* that can tell us where to send it.
*/
needmap++;
}
dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
req->r_osd ? req->r_osd->o_osd : -1);
__register_request(osdc, req);
__unregister_linger_request(osdc, req);
dout("kicking lingering %p tid %llu osd%d\n", req,
req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
__register_request(osdc, req);
__unregister_linger_request(osdc, req);
}
}
reset_changed_osds(osdc);
mutex_unlock(&osdc->request_mutex);