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cifs: cork the socket before a send and uncork it afterward

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We want to send SMBs as "atomically" as possible. Prior to sending any
data on the socket, cork it to make sure that no non-full frames go
out. Afterward, uncork it to make sure all of the data gets pushed out
to the wire.

Note that this more or less renders the socket=TCP_NODELAY mount option
obsolete. When TCP_CORK and TCP_NODELAY are used on the same socket,
TCP_NODELAY is essentially ignored.

Acked-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton
2012-09-18 16:20:35 -07:00
committed by Steve French
parent 6f49f46b18
commit b8eed28375
2 changed files with 16 additions and 0 deletions
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4
fs/cifs/connect.c
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@@ -1680,6 +1680,10 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
if (string == NULL)
goto out_nomem;
/*
* FIXME: since we now cork/uncork the socket while
* sending, should we deprecate this option?
*/
if (strnicmp(string, "TCP_NODELAY", 11) == 0)
vol->sockopt_tcp_nodelay = 1;
break;