CIFS: Simplify inFlight logic
by making it as unsigned integer and surround access with req_lock
from server structure.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 99a27cf..e2673aa 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -254,28 +254,29 @@
return smb_sendv(server, &iov, 1);
}
-static int wait_for_free_request(struct TCP_Server_Info *server,
- const int long_op)
+static int
+wait_for_free_request(struct TCP_Server_Info *server, const int long_op)
{
+ spin_lock(&server->req_lock);
+
if (long_op == CIFS_ASYNC_OP) {
/* oplock breaks must not be held up */
- atomic_inc(&server->inFlight);
+ server->in_flight++;
+ spin_unlock(&server->req_lock);
return 0;
}
- spin_lock(&GlobalMid_Lock);
while (1) {
- if (atomic_read(&server->inFlight) >= server->maxReq) {
- spin_unlock(&GlobalMid_Lock);
+ if (server->in_flight >= server->maxReq) {
+ spin_unlock(&server->req_lock);
cifs_num_waiters_inc(server);
wait_event(server->request_q,
- atomic_read(&server->inFlight)
- < server->maxReq);
+ in_flight(server) < server->maxReq);
cifs_num_waiters_dec(server);
- spin_lock(&GlobalMid_Lock);
+ spin_lock(&server->req_lock);
} else {
if (server->tcpStatus == CifsExiting) {
- spin_unlock(&GlobalMid_Lock);
+ spin_unlock(&server->req_lock);
return -ENOENT;
}
@@ -284,8 +285,8 @@
/* update # of requests on the wire to server */
if (long_op != CIFS_BLOCKING_OP)
- atomic_inc(&server->inFlight);
- spin_unlock(&GlobalMid_Lock);
+ server->in_flight++;
+ spin_unlock(&server->req_lock);
break;
}
}
@@ -359,7 +360,7 @@
mid = AllocMidQEntry(hdr, server);
if (mid == NULL) {
mutex_unlock(&server->srv_mutex);
- atomic_dec(&server->inFlight);
+ dec_in_flight(server);
wake_up(&server->request_q);
return -ENOMEM;
}
@@ -392,7 +393,7 @@
return rc;
out_err:
delete_mid(mid);
- atomic_dec(&server->inFlight);
+ dec_in_flight(server);
wake_up(&server->request_q);
return rc;
}
@@ -564,7 +565,7 @@
mutex_unlock(&ses->server->srv_mutex);
cifs_small_buf_release(in_buf);
/* Update # of requests on wire to server */
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
}
@@ -601,7 +602,7 @@
midQ->callback = DeleteMidQEntry;
spin_unlock(&GlobalMid_Lock);
cifs_small_buf_release(in_buf);
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
}
@@ -612,7 +613,7 @@
rc = cifs_sync_mid_result(midQ, ses->server);
if (rc != 0) {
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
}
@@ -637,7 +638,7 @@
midQ->resp_buf = NULL;
out:
delete_mid(midQ);
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
@@ -688,7 +689,7 @@
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
/* Update # of requests on wire to server */
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
}
@@ -721,7 +722,7 @@
/* no longer considered to be "in-flight" */
midQ->callback = DeleteMidQEntry;
spin_unlock(&GlobalMid_Lock);
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
}
@@ -730,7 +731,7 @@
rc = cifs_sync_mid_result(midQ, ses->server);
if (rc != 0) {
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;
}
@@ -747,7 +748,7 @@
rc = cifs_check_receive(midQ, ses->server, 0);
out:
delete_mid(midQ);
- atomic_dec(&ses->server->inFlight);
+ dec_in_flight(ses->server);
wake_up(&ses->server->request_q);
return rc;