From b7a10626c8bc88fd097a8bb4486c89558f89320c Mon Sep 17 00:00:00 2001 From: Steve French Date: Sun, 7 Oct 2012 20:00:47 -0500 Subject: [PATCH] [CIFS] WARN_ON_ONCE if kernel_sendmsg() returns -ENOSPC kernel_sendmsg() is less likely to return -ENOSPC and it might be a bug to do so. However, in the past there might have been cases where a -ENOSPC was returned from a low level driver. Add a WARN_ON_ONCE() to ensure that it is safe to assume that -ENOSPC is no longer returned. This -ENOSPC specific handling will be removed once we are sure it is no longer returned. Reviewed-by: Jeff Layton Signed-off-by: Suresh Jayaraman Signed-off-by: Steve French --- fs/cifs/transport.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 2126ab18504..76d974c952f 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -183,6 +183,12 @@ smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec, rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], n_vec - first_vec, remaining); if (rc == -ENOSPC || rc == -EAGAIN) { + /* + * Catch if a low level driver returns -ENOSPC. This + * WARN_ON will be removed by 3.10 if no one reports + * seeing this. + */ + WARN_ON_ONCE(rc == -ENOSPC); i++; if (i >= 14 || (!server->noblocksnd && (i > 2))) { cERROR(1, "sends on sock %p stuck for 15 " -- 2.46.0