[CIFS] Handle legacy servers which return undefined time zone

Signed-off-by: Guenter Kukkukk <linux@kukkukk.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index dcd7087..9971859 100644 (file)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -447,6 +447,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 #ifdef CONFIG_CIFS_WEAK_PW_HASH 
        } else if((pSMBr->hdr.WordCount == 13)
                        && (pSMBr->DialectIndex == LANMAN_PROT)) {
+               int tmp, adjust;
                struct lanman_neg_rsp * rsp = (struct lanman_neg_rsp *)pSMBr;
 
                if((secFlags & CIFSSEC_MAY_LANMAN) || 
@@ -473,11 +474,36 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                        server->capabilities = CAP_MPX_MODE;
                }
                server->timeZone = le16_to_cpu(rsp->ServerTimeZone);
+               tmp = le16_to_cpu(rsp->ServerTimeZone);
+               if (tmp == (int)0xffff) {
+                       /* OS/2 often does not set timezone therefore
+                        * we must use server time to calc time zone.
+                        * Could deviate slightly from the right zone. Not easy
+                        * to adjust, since timezones are not always a multiple
+                        * of 60 (sometimes 30 minutes - are there smaller?)
+                        */
+                       struct timespec ts, utc;
+                       utc = CURRENT_TIME;
+                       ts = cnvrtDosUnixTm(le16_to_cpu(rsp->SrvTime.Date),
+                                               le16_to_cpu(rsp->SrvTime.Time));
+                       cFYI(1,("SrvTime: %d sec since 1970 (utc: %d) diff: %d",
+                               (int)ts.tv_sec, (int)utc.tv_sec, 
+                               (int)(utc.tv_sec - ts.tv_sec)));
+                       tmp = (int)(utc.tv_sec - ts.tv_sec);
+                       adjust = tmp < 0 ? -29 : 29;
+                       tmp = ((tmp + adjust) / 60) * 60;
+                       server->timeZone = tmp;
+               } else {
+                       server->timeZone = tmp * 60; /* also in seconds */
+               }
+               cFYI(1,("server->timeZone: %d seconds", server->timeZone));
+
 
                /* BB get server time for time conversions and add
                code to use it and timezone since this is not UTC */    
 
-               if (rsp->EncryptionKeyLength == cpu_to_le16(CIFS_CRYPTO_KEY_SIZE)) {
+               if (rsp->EncryptionKeyLength == 
+                               cpu_to_le16(CIFS_CRYPTO_KEY_SIZE)) {
                        memcpy(server->cryptKey, rsp->EncryptionKey,
                                CIFS_CRYPTO_KEY_SIZE);
                } else if (server->secMode & SECMODE_PW_ENCRYPT) {