[CIFS] readdir (ffirst) enablement of accurate timestamps from legacy servers

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 18 insertions, 21 deletions

diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index fa5124d9af19..3d86b31cf2e4 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -918,45 +918,42 @@ __le64 cnvrtDosCifsTm(__u16 date, __u16 time)
 {
         return cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm(date, time)));
 }
+
 struct timespec cnvrtDosUnixTm(__u16 date, __u16 time)
 {
-        __u8  dt[2];
-        __u8  tm[2];
         struct timespec ts;
-        int sec,min, days, month, year;
-        struct timespec removeme; /* BB removeme BB */
-/*      SMB_TIME * st = (SMB_TIME *)&time;*/
+        int sec, min, days, month, year;
+        SMB_TIME * st = (SMB_TIME *)&time;
+        SMB_DATE * sd = (SMB_DATE *)&date;
 
         cFYI(1,("date %d time %d",date, time));
 
-        dt[0] = date & 0xFF;
-        dt[1] = (date & 0xFF00) >> 8;
-        tm[0] = time & 0xFF;
-        tm[1] = (time & 0xFF00) >> 8;
-
-        sec = tm[0] & 0x1F;
-        sec = 2 * sec;
-        min = ((tm[0] >>5)&0xFF) + ((tm[1] & 0x7)<<3);
-
+        sec = 2 * st->TwoSeconds;
+        min = st->Minutes;
+        if((sec > 59) || (min > 59))
+                cERROR(1,("illegal time min %d sec %d", min, sec));
         sec += (min * 60);
-        sec += 60 * 60 * ((tm[1] >> 3) &0xFF) /* hours */;
-        days = (dt[0] & 0x1F) - 1;
-        month = ((dt[0] >> 5) & 0xFF) + ((dt[1] & 0x1) <<3);
-        if(month > 12)
-                cERROR(1,("illegal month %d in date", month));
+        sec += 60 * 60 * st->Hours;
+        if(st->Hours > 24)
+                cERROR(1,("illegal hours %d",st->Hours));
+        days = sd->Day;
+        month = sd->Month;
+        if((days > 31) || (month > 12))
+                cERROR(1,("illegal date, month %d day: %d", month, days));
         month -= 1;
         days += total_days_of_prev_months[month];
         days += 3653; /* account for difference in days between 1980 and 1970 */
-        year = (dt[1]>>1) & 0xFF;
+        year = sd->Year;
         days += year * 365;
         days += (year/4); /* leap year */
         /* adjust for leap year where we are still before leap day */
         days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);
         sec += 24 * 60 * 60 * days; 
 
-        removeme = CURRENT_TIME; /* BB removeme BB */
         ts.tv_sec = sec;
 
+        /* cFYI(1,("sec after cnvrt dos to unix time %d",sec)); */
+
         ts.tv_nsec = 0;
         return ts;
 }