[CIFS] Legacy time handling for Win9x and OS/2 part 1

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

6 files changed, 80 insertions, 4 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index b35c55c3c8bb..2fbc982aa13d 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -80,6 +80,9 @@ extern struct oplock_q_entry * AllocOplockQEntry(struct inode *, u16,
 extern void DeleteOplockQEntry(struct oplock_q_entry *);
 extern struct timespec cifs_NTtimeToUnix(u64 /* utc nanoseconds since 1601 */ );
 extern u64 cifs_UnixTimeToNT(struct timespec);
+extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
+extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
+
 extern int cifs_get_inode_info(struct inode **pinode,
                         const unsigned char *search_path, 
                         FILE_ALL_INFO * pfile_info,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 075d8fb3d376..2851d6e0d823 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2856,7 +2856,6 @@ qsec_out:
         return rc;
 }
 
-
 /* Legacy Query Path Information call for lookup to old servers such
    as Win9x/WinME */
 int SMBQueryInformation(const int xid, struct cifsTconInfo *tcon,
@@ -2898,7 +2897,16 @@ QInfRetry:
         if (rc) {
                 cFYI(1, ("Send error in QueryInfo = %d", rc));
         } else if (pFinfo) {            /* decode response */
+                struct timespec ts;
+                __u32 time = le32_to_cpu(pSMBr->last_write_time);
+                /* BB FIXME - add time zone adjustment BB */
                 memset(pFinfo, 0, sizeof(FILE_ALL_INFO));
+                ts.tv_nsec = 0;
+                ts.tv_sec = time;
+                /* decode time fields */
+                pFinfo->ChangeTime = cifs_UnixTimeToNT(ts);
+                pFinfo->LastWriteTime = pFinfo->ChangeTime;
+                pFinfo->LastAccessTime = 0;
                 pFinfo->AllocationSize =
                         cpu_to_le64(le32_to_cpu(pSMBr->size));
                 pFinfo->EndOfFile = pFinfo->AllocationSize;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index b88147c1dc27..06dbce3a1815 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -432,8 +432,11 @@ int cifs_get_inode_info(struct inode **pinode,
                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 
                 /* Linux can not store file creation time so ignore it */
-                inode->i_atime =
-                    cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
+                if(pfindData->LastAccessTime)
+                        inode->i_atime = cifs_NTtimeToUnix
+                                (le64_to_cpu(pfindData->LastAccessTime));
+                else /* do not need to use current_fs_time - time not stored */
+                        inode->i_atime = CURRENT_TIME;
                 inode->i_mtime =
                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
                 inode->i_ctime =
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index a57f5d6e6213..0bee8b7e521a 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -254,7 +254,11 @@ cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
                                 tmpbuffer,
                                 len - 1,
                                 cifs_sb->local_nls);
-        else {
+        else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
+                cERROR(1,("SFU style symlinks not implemented yet"));
+                /* add open and read as in fs/cifs/inode.c */
+        
+        } else {
                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
                                 OPEN_REPARSE_POINT,&fid, &oplock, NULL, 
                                 cifs_sb->local_nls, 
diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index ce87550e918f..fa5124d9af19 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -909,3 +909,54 @@ cifs_UnixTimeToNT(struct timespec t)
         /* Convert to 100ns intervals and then add the NTFS time offset. */
         return (u64) t.tv_sec * 10000000 + t.tv_nsec/100 + NTFS_TIME_OFFSET;
 }
+
+static int total_days_of_prev_months[] =
+{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+
+
+__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;*/
+
+        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 += (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));
+        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;
+        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;
+
+        ts.tv_nsec = 0;
+        return ts;
+} 
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 9aeb58a7d369..71e86c38e632 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -135,12 +135,19 @@ static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
                 tmp_inode->i_ctime =
                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
         } else { /* legacy, OS2 and DOS style */
+/*              struct timespec ts;*/
                 FIND_FILE_STANDARD_INFO * pfindData = 
                         (FIND_FILE_STANDARD_INFO *)buf;
 
+/*              ts = cnvrtDosUnixTm(
+                                le16_to_cpu(pfindData->LastWriteDate),
+                                le16_to_cpu(pfindData->LastWriteTime));*/
                 attr = le16_to_cpu(pfindData->Attributes);
                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
                 end_of_file = le32_to_cpu(pfindData->DataSize);
+                /* do not need to use current_fs_time helper function since
+                 time not stored for this case so atime can not "go backwards"
+                 by pulling newer older from disk when inode refrenshed */
                 tmp_inode->i_atime = CURRENT_TIME;
                 /* tmp_inode->i_mtime =  BB FIXME - add dos time handling
                 tmp_inode->i_ctime = 0;   BB FIXME */