cifs: add ignore_pend flag to cifs_call_async

The current code always ignores the max_pending limit. Have it instead
only optionally ignore the pending limit. For CIFSSMBEcho, we need to
ignore it to make sure they always can go out. For async reads, writes
and potentially other calls, we need to respect it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 5 insertions, 4 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index f00aa74c2607..3738a322cbef 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -69,7 +69,7 @@ extern struct mid_q_entry *AllocMidQEntry(const struct smb_hdr *smb_buffer,
 extern void DeleteMidQEntry(struct mid_q_entry *midEntry);
 extern int cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
                            unsigned int nvec, mid_callback_t *callback,
-                           void *cbdata);
+                           void *cbdata, bool ignore_pend);
 extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,
                         struct smb_hdr * /* input */ ,
                         struct smb_hdr * /* out */ ,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 8791c74575d9..e0d24135b3c6 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -743,7 +743,7 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
         iov.iov_base = smb;
         iov.iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
 
-        rc = cifs_call_async(server, &iov, 1, cifs_echo_callback, server);
+        rc = cifs_call_async(server, &iov, 1, cifs_echo_callback, server, true);
         if (rc)
                 cFYI(1, "Echo request failed: %d", rc);
 
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 67f59c7b5d79..16bcc0725cee 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -343,13 +343,14 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
  */
 int
 cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
-                unsigned int nvec, mid_callback_t *callback, void *cbdata)
+                unsigned int nvec, mid_callback_t *callback, void *cbdata,
+                bool ignore_pend)
 {
         int rc;
         struct mid_q_entry *mid;
         struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base;
 
-        rc = wait_for_free_request(server, CIFS_ASYNC_OP);
+        rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0);
         if (rc)
                 return rc;