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libceph: take map_sem for read in handle_reply()

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Handling redirect replies requires both map_sem and request_mutex.
Taking map_sem unconditionally near the top of handle_reply() avoids
possible race conditions that arise from releasing request_mutex to be
able to acquire map_sem in redirect reply case.  (Lock ordering is:
map_sem, request_mutex, crush_mutex.)

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Ilya Dryomov 2014-02-03 13:56:33 +02:00 committed by Sage Weil
parent 0bbfdfe8d2
commit ff513ace9b
1 changed files with 11 additions and 6 deletions
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17
net/ceph/osd_client.c
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@ -1687,6 +1687,7 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
osdmap_epoch = ceph_decode_32(&p);
/* lookup */
down_read(&osdc->map_sem);
mutex_lock(&osdc->request_mutex);
req = __lookup_request(osdc, tid);
if (req == NULL) {
@ -1743,7 +1744,6 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
dout("redirect pool %lld\n", redir.oloc.pool);
__unregister_request(osdc, req);
mutex_unlock(&osdc->request_mutex);
req->r_target_oloc = redir.oloc; /* struct */
@ -1755,10 +1755,10 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
* successfully. In the future we might want to follow
* original request's nofail setting here.
*/
err = ceph_osdc_start_request(osdc, req, true);
err = __ceph_osdc_start_request(osdc, req, true);
BUG_ON(err);
goto done;
goto out_unlock;
}
already_completed = req->r_got_reply;
@ -1776,8 +1776,7 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
req->r_got_reply = 1;
} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
dout("handle_reply tid %llu dup ack\n", tid);
mutex_unlock(&osdc->request_mutex);
goto done;
goto out_unlock;
}
dout("handle_reply tid %llu flags %d\n", tid, flags);
@ -1792,6 +1791,7 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
__unregister_request(osdc, req);
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
if (!already_completed) {
if (req->r_unsafe_callback &&
@ -1809,10 +1809,14 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
complete_request(req);
}
done:
out:
dout("req=%p req->r_linger=%d\n", req, req->r_linger);
ceph_osdc_put_request(req);
return;
out_unlock:
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
goto out;
bad_put:
req->r_result = -EIO;
@ -1825,6 +1829,7 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
ceph_osdc_put_request(req);
bad_mutex:
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
bad:
pr_err("corrupt osd_op_reply got %d %d\n",
(int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));