SMB3: Add mount parameter to allow user to override max credits

[cascardo/linux.git] / fs / cifs / smb2ops.c

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 91e53df..378260c 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -70,6 +70,10 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
        spin_lock(&server->req_lock);
        val = server->ops->get_credits_field(server, optype);
        *val += add;
+       if (*val > 65000) {
+               *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
+               printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
+       }
        server->in_flight--;
        if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
                rc = change_conf(server);