[CIFS] Add support for legacy servers part eight. Write fixes for Windows

ME, and do not set ctime unless explicitly requested with atime and/or
mtime (it gets thrown away by most servers anyway as there is no way to set
this via posix).

Signed-off-by: Steve French (sfrench@us.ibm.com)

1 files changed, 9 insertions, 6 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 575b2281518d..f72a61df3c68 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1072,7 +1072,7 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
         if (bytes_sent > count)
                 bytes_sent = count;
         pSMB->DataOffset =
-            cpu_to_le16(offsetof(struct smb_com_write_req,Data) - 4);
+                cpu_to_le16(offsetof(struct smb_com_write_req,Data) - 4);
         if(buf)
             memcpy(pSMB->Data,buf,bytes_sent);
         else if(ubuf) {
@@ -1080,20 +1080,23 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
                         cifs_buf_release(pSMB);
                         return -EFAULT;
                 }
-        } else {
+        } else if (count != 0) {
                 /* No buffer */
                 cifs_buf_release(pSMB);
                 return -EINVAL;
+        } /* else setting file size with write of zero bytes */
+        if(wct == 14)
+                byte_count = bytes_sent + 1; /* pad */
+        else /* wct == 12 */ {
+                byte_count = bytes_sent + 5; /* bigger pad, smaller smb hdr */
         }
-
-        byte_count = bytes_sent + 1 /* pad */ ; /* BB fix this for sends > 64K */
         pSMB->DataLengthLow = cpu_to_le16(bytes_sent & 0xFFFF);
         pSMB->DataLengthHigh = cpu_to_le16(bytes_sent >> 16);
-        pSMB->hdr.smb_buf_length += bytes_sent+1;
+        pSMB->hdr.smb_buf_length += byte_count;
 
         if(wct == 14)
                 pSMB->ByteCount = cpu_to_le16(byte_count);
-        else { /* old style write has byte count 4 bytes earlier */
+        else { /* old style write has byte count 4 bytes earlier so 4 bytes pad  */
                 struct smb_com_writex_req * pSMBW = 
                         (struct smb_com_writex_req *)pSMB;
                 pSMBW->ByteCount = cpu_to_le16(byte_count);