[CIFS] Add support for legacy servers part nine. statfs (df and du) is now

functional, and the length check is fixed so readdir does not throw a
warning message when windows me messes up the response to FindFirst
of an empty dir (with only . and ..).

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

1 files changed, 89 insertions, 6 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index f72a61d..daf717e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3215,6 +3215,92 @@ GetDFSRefExit:
 	return rc;
 }
 
+/* Query File System Info such as free space to old servers such as Win 9x */
+int
+SMBOldQFSInfo(const int xid, struct cifsTconInfo *tcon, struct kstatfs *FSData)
+{
+/* level 0x01 SMB_QUERY_FILE_SYSTEM_INFO */
+	TRANSACTION2_QFSI_REQ *pSMB = NULL;
+	TRANSACTION2_QFSI_RSP *pSMBr = NULL;
+	FILE_SYSTEM_ALLOC_INFO *response_data;
+	int rc = 0;
+	int bytes_returned = 0;
+	__u16 params, byte_count;
+
+	cFYI(1, ("OldQFSInfo"));
+oldQFSInfoRetry:
+	rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+		(void **) &pSMBr);
+	if (rc)
+		return rc;
+	rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+		      (void **) &pSMBr);
+	if (rc)
+		return rc;
+
+	params = 2;     /* level */
+	pSMB->TotalDataCount = 0;
+	pSMB->MaxParameterCount = cpu_to_le16(2);
+	pSMB->MaxDataCount = cpu_to_le16(1000);
+	pSMB->MaxSetupCount = 0;
+	pSMB->Reserved = 0;
+	pSMB->Flags = 0;
+	pSMB->Timeout = 0;
+	pSMB->Reserved2 = 0;
+	byte_count = params + 1 /* pad */ ;
+	pSMB->TotalParameterCount = cpu_to_le16(params);
+	pSMB->ParameterCount = pSMB->TotalParameterCount;
+	pSMB->ParameterOffset = cpu_to_le16(offsetof(
+	struct smb_com_transaction2_qfsi_req, InformationLevel) - 4);
+	pSMB->DataCount = 0;
+	pSMB->DataOffset = 0;
+	pSMB->SetupCount = 1;
+	pSMB->Reserved3 = 0;
+	pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_FS_INFORMATION);
+	pSMB->InformationLevel = cpu_to_le16(SMB_INFO_ALLOCATION);
+	pSMB->hdr.smb_buf_length += byte_count;
+	pSMB->ByteCount = cpu_to_le16(byte_count);
+
+	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+		(struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	if (rc) {
+		cFYI(1, ("Send error in QFSInfo = %d", rc));
+	} else {                /* decode response */
+		rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+
+		if (rc || (pSMBr->ByteCount < 18))
+			rc = -EIO;      /* bad smb */
+		else {
+			__u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+			cFYI(1,("qfsinf resp BCC: %d  Offset %d",
+				 pSMBr->ByteCount, data_offset));
+
+			response_data =
+				(FILE_SYSTEM_ALLOC_INFO *) 
+				(((char *) &pSMBr->hdr.Protocol) + data_offset);
+			FSData->f_bsize =
+				le16_to_cpu(response_data->BytesPerSector) *
+				le32_to_cpu(response_data->
+					SectorsPerAllocationUnit);
+			FSData->f_blocks =
+				le32_to_cpu(response_data->TotalAllocationUnits);
+			FSData->f_bfree = FSData->f_bavail =
+				le32_to_cpu(response_data->FreeAllocationUnits);
+			cFYI(1,
+			     ("Blocks: %lld  Free: %lld Block size %ld",
+			      (unsigned long long)FSData->f_blocks,
+			      (unsigned long long)FSData->f_bfree,
+			      FSData->f_bsize));
+		}
+	}
+	cifs_buf_release(pSMB);
+
+	if (rc == -EAGAIN)
+		goto oldQFSInfoRetry;
+
+	return rc;
+}
+
 int
 CIFSSMBQFSInfo(const int xid, struct cifsTconInfo *tcon, struct kstatfs *FSData)
 {
@@ -3236,7 +3322,7 @@ QFSInfoRetry:
 	params = 2;	/* level */
 	pSMB->TotalDataCount = 0;
 	pSMB->MaxParameterCount = cpu_to_le16(2);
-	pSMB->MaxDataCount = cpu_to_le16(1000);	/* BB find exact max SMB PDU from sess structure BB */
+	pSMB->MaxDataCount = cpu_to_le16(1000);
 	pSMB->MaxSetupCount = 0;
 	pSMB->Reserved = 0;
 	pSMB->Flags = 0;
@@ -3259,17 +3345,14 @@ QFSInfoRetry:
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
 			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
 	if (rc) {
-		cERROR(1, ("Send error in QFSInfo = %d", rc));
+		cFYI(1, ("Send error in QFSInfo = %d", rc));
 	} else {		/* decode response */
                 rc = validate_t2((struct smb_t2_rsp *)pSMBr);
 
-		if (rc || (pSMBr->ByteCount < 24)) /* BB alsO CHEck enough total bytes returned */
+		if (rc || (pSMBr->ByteCount < 24))
 			rc = -EIO;	/* bad smb */
 		else {
 			__u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
-			cFYI(1,
-				("Decoding qfsinfo response.  BCC: %d  Offset %d",
-				pSMBr->ByteCount, data_offset));
 
 			response_data =
 			    (FILE_SYSTEM_INFO