[CIFS] Add support for legacy servers part 4

	Fix WriteX support for old servers which do not support large
	files.

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

1 files changed, 23 insertions, 4 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index c8ae3ef422ba..74733851cfad 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1082,12 +1082,20 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
         int rc = -EACCES;
         WRITE_REQ *pSMB = NULL;
         WRITE_RSP *pSMBr = NULL;
-        int bytes_returned;
+        int bytes_returned, wct;
         __u32 bytes_sent;
         __u16 byte_count;
 
         /* cFYI(1,("write at %lld %d bytes",offset,count));*/
-        rc = smb_init(SMB_COM_WRITE_ANDX, 14, tcon, (void **) &pSMB,
+        if(tcon->ses == NULL)
+                return -ECONNABORTED;
+
+        if(tcon->ses->capabilities & CAP_LARGE_FILES)
+                wct = 14;
+        else
+                wct = 12;
+
+        rc = smb_init(SMB_COM_WRITE_ANDX, wct, tcon, (void **) &pSMB,
                       (void **) &pSMBr);
         if (rc)
                 return rc;
@@ -1098,7 +1106,11 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
         pSMB->AndXCommand = 0xFF;       /* none */
         pSMB->Fid = netfid;
         pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF);
-        pSMB->OffsetHigh = cpu_to_le32(offset >> 32);
+        if(wct == 14) 
+                pSMB->OffsetHigh = cpu_to_le32(offset >> 32);
+        else if((offset >> 32) > 0) /* can not handle this big offset for old */
+                return -EIO;
+        
         pSMB->Reserved = 0xFFFFFFFF;
         pSMB->WriteMode = 0;
         pSMB->Remaining = 0;
@@ -1135,7 +1147,14 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
         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->ByteCount = cpu_to_le16(byte_count);
+
+        if(wct == 14)
+                pSMB->ByteCount = cpu_to_le16(byte_count);
+        else { /* old style write has byte count 4 bytes earlier */
+                struct smb_com_writex_req * pSMBW = 
+                        (struct smb_com_writex_req *)pSMB;
+                pSMBW->ByteCount = cpu_to_le16(byte_count);
+        }
 
         rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                          (struct smb_hdr *) pSMBr, &bytes_returned, long_op);