diff options
| -rw-r--r-- | include/linux/ceph/messenger.h | 5 | ||||
| -rw-r--r-- | net/ceph/messenger.c | 46 |
2 files changed, 2 insertions, 49 deletions
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h index a108b42..c3011be 100644 --- a/include/linux/ceph/messenger.h +++ b/include/linux/ceph/messenger.h @@ -110,17 +110,12 @@ struct ceph_msg_pos { /* * ceph_connection state bit flags - * - * QUEUED and BUSY are used together to ensure that only a single - * thread is currently opening, reading or writing data to the socket. */ #define LOSSYTX 0 /* we can close channel or drop messages on errors */ #define CONNECTING 1 #define NEGOTIATING 2 #define KEEPALIVE_PENDING 3 #define WRITE_PENDING 4 /* we have data ready to send */ -#define QUEUED 5 /* there is work queued on this connection */ -#define BUSY 6 /* work is being done */ #define STANDBY 8 /* no outgoing messages, socket closed. we keep * the ceph_connection around to maintain shared * state with the peer. */ diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index b6ff4a1..dff633d 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -96,7 +96,7 @@ struct workqueue_struct *ceph_msgr_wq; int ceph_msgr_init(void) { - ceph_msgr_wq = create_workqueue("ceph-msgr"); + ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0); if (!ceph_msgr_wq) { pr_err("msgr_init failed to create workqueue\n"); return -ENOMEM; @@ -1920,20 +1920,6 @@ bad_tag: /* * Atomically queue work on a connection. Bump @con reference to * avoid races with connection teardown. - * - * There is some trickery going on with QUEUED and BUSY because we - * only want a _single_ thread operating on each connection at any - * point in time, but we want to use all available CPUs. - * - * The worker thread only proceeds if it can atomically set BUSY. It - * clears QUEUED and does it's thing. When it thinks it's done, it - * clears BUSY, then rechecks QUEUED.. if it's set again, it loops - * (tries again to set BUSY). - * - * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we - * try to queue work. If that fails (work is already queued, or BUSY) - * we give up (work also already being done or is queued) but leave QUEUED - * set so that the worker thread will loop if necessary. */ static void queue_con(struct ceph_connection *con) { @@ -1948,11 +1934,7 @@ static void queue_con(struct ceph_connection *con) return; } - set_bit(QUEUED, &con->state); - if (test_bit(BUSY, &con->state)) { - dout("queue_con %p - already BUSY\n", con); - con->ops->put(con); - } else if (!queue_work(ceph_msgr_wq, &con->work.work)) { + if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) { dout("queue_con %p - already queued\n", con); con->ops->put(con); } else { @@ -1967,15 +1949,6 @@ static void con_work(struct work_struct *work) { struct ceph_connection *con = container_of(work, struct ceph_connection, work.work); - int backoff = 0; - -more: - if (test_and_set_bit(BUSY, &con->state) != 0) { - dout("con_work %p BUSY already set\n", con); - goto out; - } - dout("con_work %p start, clearing QUEUED\n", con); - clear_bit(QUEUED, &con->state); mutex_lock(&con->mutex); @@ -1994,28 +1967,13 @@ more: try_read(con) < 0 || try_write(con) < 0) { mutex_unlock(&con->mutex); - backoff = 1; ceph_fault(con); /* error/fault path */ goto done_unlocked; } done: mutex_unlock(&con->mutex); - done_unlocked: - clear_bit(BUSY, &con->state); - dout("con->state=%lu\n", con->state); - if (test_bit(QUEUED, &con->state)) { - if (!backoff || test_bit(OPENING, &con->state)) { - dout("con_work %p QUEUED reset, looping\n", con); - goto more; - } - dout("con_work %p QUEUED reset, but just faulted\n", con); - clear_bit(QUEUED, &con->state); - } - dout("con_work %p done\n", con); - -out: con->ops->put(con); } |