On Sun, 12 Dec 2010 17:52:26 -0600
Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx> wrote:
> On Fri, Dec 10, 2010 at 9:44 AM, Jeff Layton <jlayton@xxxxxxxxxx> wrote:
> > Make it use a switch statement based on the value of the midStatus. If
> > the resp_buf is set, then MID_RESPONSE_RECEIVED is too.
> >
> > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> > ---
> > fs/cifs/transport.c | 36 ++++++++++++++++++------------------
> > 1 files changed, 18 insertions(+), 18 deletions(-)
> >
> > diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
> > index 0c0dadd..05ced17 100644
> > --- a/fs/cifs/transport.c
> > +++ b/fs/cifs/transport.c
> > @@ -356,33 +356,33 @@ handle_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
> > {
> > int rc = 0;
> >
> > - spin_lock(&GlobalMid_Lock);
> > + cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command,
> > + mid->mid, mid->midState);
> >
> > - if (mid->resp_buf) {
> > + spin_lock(&GlobalMid_Lock);
> > + switch (mid->midState) {
> > + case MID_RESPONSE_RECEIVED:
> > spin_unlock(&GlobalMid_Lock);
> > return rc;
> > - }
> > -
> > - cERROR(1, "No response to cmd %d mid %d", mid->command, mid->mid);
> > - if (mid->midState == MID_REQUEST_SUBMITTED) {
> > - if (server->tcpStatus == CifsExiting)
> > + case MID_REQUEST_SUBMITTED:
> > + /* socket is going down, reject all calls */
> > + if (server->tcpStatus == CifsExiting) {
> > + cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d",
> > + __func__, mid->mid, mid->command, mid->midState);
> > rc = -EHOSTDOWN;
> > - else
> > - mid->midState = MID_RETRY_NEEDED;
> > - }
> > -
> > - if (rc != -EHOSTDOWN) {
> > - if (mid->midState == MID_RETRY_NEEDED) {
> > - rc = -EAGAIN;
> > - cFYI(1, "marking request for retry");
> > - } else {
> > - rc = -EIO;
> > + break;
> > }
> > + mid->midState = MID_RETRY_NEEDED;
>
> Would it be cleaner to set rc to -EAGAIN instead of setting state here
> to fall down and then setting rc as -EAGAIN?
>
I'm not sure it'll be any more clear. It seems clear enough to me -- if
it's still SUBMITTED, then we want to treat it if it were
"RETRY_NEEDED".
Honestly, this really shouldn't happen. With this patchset, you should
never reach this function if the state is still 'SUBMITTED'. I left it
there for completeness sake and future-proofness.
> > + case MID_RETRY_NEEDED:
> > + rc = -EAGAIN;
> > + break;
> > + default:
> > + cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__,
> > + mid->mid, mid->midState);
> > }
> > spin_unlock(&GlobalMid_Lock);
> >
> > DeleteMidQEntry(mid);
> > - /* Update # of requests on wire to server */
> > atomic_dec(&server->inFlight);
> > wake_up(&server->request_q);
> >
> > --
> > 1.7.3.2
> >
> > --
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> >
--
Jeff Layton <jlayton@xxxxxxxxxx>
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