[CIFS] Enable DFS support for Windows query path info

Final piece for handling DFS in query_path_info, constructing a
fake inode for the junction directory which the submount will cover.

This handles the non-Unix (Windows etc.) code path.
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/inode.c

@@ -161,6 +161,12 @@ static void cifs_unix_info_to_inode(struct inode *inode,
 	spin_unlock(&inode->i_lock);
 }
 
+
+/*
+ *	Needed to setup inode data for the directory which is the
+ *	junction to the new submount (ie to setup the fake directory
+ *      which represents a DFS referral)
+ */
 static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
 			       struct super_block *sb)
 {
@@ -370,11 +376,42 @@ static int get_sfu_mode(struct inode *inode,
 #endif
 }
 
+/*
+ *	Needed to setup inode data for the directory which is the
+ *	junction to the new submount (ie to setup the fake directory
+ *      which represents a DFS referral)
+ */
+static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
+			       struct super_block *sb)
+{
+	memset(pfnd_dat, sizeof(FILE_ALL_INFO), 0);
+
+/*	__le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
+	__le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
+	__u8 pfnd_dat->DeletePending = 0;
+	__u8 pfnd_data->Directory = 0;
+	__le32 pfnd_dat->EASize = 0;
+	__u64 pfnd_dat->IndexNumber = 0;
+	__u64 pfnd_dat->IndexNumber1 = 0;  */
+	pfnd_dat->CreationTime =
+		cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+	pfnd_dat->LastAccessTime =
+		cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+	pfnd_dat->LastWriteTime =
+		cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+	pfnd_dat->ChangeTime =
+		cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+	pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
+	pfnd_dat->NumberOfLinks = cpu_to_le32(2);
+}
+
 int cifs_get_inode_info(struct inode **pinode,
 	const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 	struct super_block *sb, int xid, const __u16 *pfid)
 {
 	int rc = 0;
+	__u32 attr;
+	struct cifsInodeInfo *cifsInfo;
 	struct cifsTconInfo *pTcon;
 	struct inode *inode;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
@@ -399,7 +436,6 @@ int cifs_get_inode_info(struct inode **pinode,
 			return -ENOMEM;
 		pfindData = (FILE_ALL_INFO *)buf;
 
-try_again_CIFSSMBQPathInfo:
 		/* could do find first instead but this returns more info */
 		rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 			      0 /* not legacy */,
@@ -417,15 +453,14 @@ try_again_CIFSSMBQPathInfo:
 		}
 	}
 	/* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
-	if (rc) {
-		if (rc == -EREMOTE && !is_dfs_referral) {
+	if (rc == -EREMOTE) {
 		is_dfs_referral = true;
-			goto try_again_CIFSSMBQPathInfo;
-		}
+		fill_fake_finddata(pfindData, sb);
+		rc = 0;
+	} else if (rc)
 		goto cgii_exit;
-	} else {
-		struct cifsInodeInfo *cifsInfo;
-		__u32 attr = le32_to_cpu(pfindData->Attributes);
+
+	attr = le32_to_cpu(pfindData->Attributes);
 
 	/* get new inode */
 	if (*pinode == NULL) {
@@ -442,8 +477,7 @@ try_again_CIFSSMBQPathInfo:
 		/* We can not use the IndexNumber field by default from
 		   Windows or Samba (in ALL_INFO buf) but we can request
 		   it explicitly.  It may not be unique presumably if
-			   the server has multiple devices mounted under one
-			   share */
+		   the server has multiple devices mounted under one share */
 
 		/* There may be higher info levels that work but are
 		   there Windows server or network appliances for which
@@ -490,7 +524,7 @@ try_again_CIFSSMBQPathInfo:
 		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 	inode->i_ctime =
 	    cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
-		cFYI(0, ("Attributes came in as 0x%x", attr));
+	cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 	if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 		inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 		inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
@@ -521,27 +555,22 @@ try_again_CIFSSMBQPathInfo:
 /* BB Finish for SFU style symlinks and devices */
 	} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 		   (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
-			if (decode_sfu_inode(inode,
-					 le64_to_cpu(pfindData->EndOfFile),
-					 full_path,
-					 cifs_sb, xid))
+		if (decode_sfu_inode(inode, le64_to_cpu(pfindData->EndOfFile),
+				     full_path, cifs_sb, xid))
 			cFYI(1, ("Unrecognized sfu inode type"));
 
 		cFYI(1, ("sfu mode 0%o", inode->i_mode));
 	} else {
 		inode->i_mode |= S_IFREG;
-			/* treat the dos attribute of read-only as read-only
-			   mode e.g. 555 */
+		/* treat dos attribute of read-only as read-only mode eg 555 */
 		if (cifsInfo->cifsAttrs & ATTR_READONLY)
 			inode->i_mode &= ~(S_IWUGO);
 		else if ((inode->i_mode & S_IWUGO) == 0)
 			/* the ATTR_READONLY flag may have been	*/
 			/* changed on server -- set any w bits	*/
 			/* allowed by mnt_file_mode		*/
-				inode->i_mode |= (S_IWUGO &
-						  cifs_sb->mnt_file_mode);
-		/* BB add code here -
-		   validate if device or weird share or device type? */
+			inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
+	/* BB add code to validate if device or weird share or device type? */
 	}
 
 	spin_lock(&inode->i_lock);
@@ -581,7 +610,10 @@ try_again_CIFSSMBQPathInfo:
 	}
 
 	cifs_set_ops(inode, is_dfs_referral);
-	}
+
+
+
+
 cgii_exit:
 	kfree(buf);
 	return rc;