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[CIFS] WARN_ON_ONCE if kernel_sendmsg() returns -ENOSPC

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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 <jlayton@redhat.com>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Steve French 2012-10-07 20:00:47 -05:00
parent 612a9aab56
commit b7a10626c8
1 changed files with 6 additions and 0 deletions
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6
fs/cifs/transport.c
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@ -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 "