CIFS: Use multicredits for SMB 2.1/3 writes
If we negotiate SMB 2.1 and higher version of the protocol and
a server supports large write buffer size, we need to consume 1
credit per 65536 bytes. So, we need to know how many credits
we have and obtain the required number of them before constructing
a writedata structure in writepages and iovec write.
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 18cd565..9d087f4 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -448,6 +448,15 @@
return wait_for_free_credits(server, timeout, val);
}
+int
+cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
+ unsigned int *num, unsigned int *credits)
+{
+ *num = size;
+ *credits = 0;
+ return 0;
+}
+
static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
struct mid_q_entry **ppmidQ)
{
@@ -531,20 +540,23 @@
{
int rc, timeout, optype;
struct mid_q_entry *mid;
+ unsigned int credits = 0;
timeout = flags & CIFS_TIMEOUT_MASK;
optype = flags & CIFS_OP_MASK;
- rc = wait_for_free_request(server, timeout, optype);
- if (rc)
- return rc;
+ if ((flags & CIFS_HAS_CREDITS) == 0) {
+ rc = wait_for_free_request(server, timeout, optype);
+ if (rc)
+ return rc;
+ credits = 1;
+ }
mutex_lock(&server->srv_mutex);
mid = server->ops->setup_async_request(server, rqst);
if (IS_ERR(mid)) {
mutex_unlock(&server->srv_mutex);
- add_credits(server, 1, optype);
- wake_up(&server->request_q);
+ add_credits_and_wake_if(server, credits, optype);
return PTR_ERR(mid);
}
@@ -572,8 +584,7 @@
return 0;
cifs_delete_mid(mid);
- add_credits(server, 1, optype);
- wake_up(&server->request_q);
+ add_credits_and_wake_if(server, credits, optype);
return rc;
}