[CIFS] CIFS should honour umask

This patch makes CIFS honour a process' umask like other filesystems.
Of course the server is still free to munge the permissions if it wants
to; but the client will send the "right" permissions to begin with.

A few caveats:

1) It only applies to filesystems that have CAP_UNIX (aka support unix
extensions)
2) It applies the correct mode to the follow up CIFSSMBUnixSetPerms()
after remote creation

When mode to CIFS/NTFS ACL mapping is complete we can do the
same thing for that case for servers which do not
support the Unix Extensions.

Signed-off-by: Matt Keenen <matt@opcode-solutions.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/inode.c

@@ -986,7 +986,8 @@ mkdir_get_info:
 		  * failed to get it from the server or was set bogus */ 
 		if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
 				direntry->d_inode->i_nlink = 2; 
-		if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
+		if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
+			mode &= ~current->fs->umask;
 			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 				CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 						    mode,
@@ -1004,7 +1005,7 @@ mkdir_get_info:
 						    cifs_sb->mnt_cifs_flags & 
 						    CIFS_MOUNT_MAP_SPECIAL_CHR);
 			}
-		else {
+		} else {
 			/* BB to be implemented via Windows secrty descriptors
 			   eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 						 -1, -1, local_nls); */