[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 f72a61df3c68..daf717e6b6eb 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