Added dir.5 and filesys.5 manuals.

man/dir.5

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+        11/3/70                                                  DIRECTORY (V)
+
+
+NAME              format of directories
+
+SYNOPSIS
+
+DESCRIPTION       A directory behaves exactly like an ordinary file, save
+                  that no user may write into a directory. The fact that a
+                  file is a directory is indicated by a bit in the flag word
+                  of its i-node entry.
+
+                  Directory entries are 8 words long. The first word is the
+                  i-node of the file represented by the entry, if non-zero;
+                  if zero, the entry is empty.
+
+                  Words 1-4 represent the (8-character) file name, space
+                  padded on the right. These words are not necessarily
+                  cleared for empty slots.
+
+                  By convention, the first entry in each directory is
+                  for "dd", which is the "directory directory" that holds
+		  all the users' home directories and the "system" directory.
+		  The "system" directory contains "init" and "sh".
+
+FILES
+
+SEE ALSO          file system format
+
+DIAGNOSTICS
+
+BUGS
+
+OWNER             ken, dmr

man/filesys.5

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+       11/3/70                                                FILE SYSTEM (V)
+
+
+NAME             format of file system
+
+SYNOPSIS
+
+DESCRIPTION      The RB09 fixed head disk has 8,000 64-word blocks on
+		 each of its two surfaces. Unix uses the second surface
+		 (physical blocks 8,000 to 15,999) and numbers them
+		 from logical block 0 to logical block 7,999. The following
+		 discussion refers to logical blocks.
+
+                 The Unix filesystem is divided into 8,000 blocks of 64 words
+		 per block. Block 0 is the "sysdata" block. The first word
+		 points to the first block of the free-storage map. Each block
+		 in the free-storage map is structured as follows: the first
+		 word is the block number of the next block in the free-storage
+		 map, or zero if this is the end of the free-storage map. The
+	         next nine words hold free block numbers, or zero (no block number).
+
+		 Block 1 on the filesystem is unused. (?)
+
+                 I-numbers begin at 1, and the storage for i-nodes begins at
+                 block 2. Blocks 2 to 711 contain the i-nodes, with five
+		 consecutive i-nodes per block. Certain i-nodes are reserved for
+		 special files, directories and devices:
+
+		    1	The core file written by "sys save" or a bad system call
+		    2	The "dd" directory directory
+		    3   The "system" directory
+		    6   The "ttyin" special file
+		    7   The "keyboard" (graphic-2) special file
+		    8   The "pptin" (paper tape reader) special file
+		   10   The "ttyout" special file
+		   11   The "display" (graphic-2) special file
+		   12   The "pptout" (paper tape punch) special file
+
+
+                 There is only one file system which is always mounted;
+                 it resides on the RB disk. This device is also used for
+		 swapping. The swap areas are at the high blocks on this device:
+		 blocks 6,400 to 7,999. These blocks do not appear in the free list.
+
+                 Each i-node represents one file. The format of
+                 an i-node is as follows, where the left column represents
+                 the offset in words from the beginning of the i-node:
+
+                    0           flags (see below)
+	            1		first indirect block or contents block
+	           ...
+	            7		seventh indirect block or contents block
+                    8           user ID of owner
+                    9           link count
+                   10           size in words
+	           11		unique value assigned at creation
+
+                 The flags are as follows:
+
+                    400000   i-node is allocated
+                    200000   large file
+	            ??????   allocated bit (always on)
+                    000040   special file
+                    000020   directory
+                    000010   read, owner
+                    000004   write, owner
+                    000002   read, non-owner
+                    000001   write, non-owner
+
+                 The allocated bit (flag ??????) is believed even if the i-node
+		 map says the i-node is free; thus corruption of the map may
+		 cause i-nodes to become unallocatable, but will not cause active
+		 nodes to be reused.
+
+                 Word number n of a file is accessed as follows: n is
+                 divided by 64 to find its logical block number (say b) in
+                 the file. If the file is small (flag 200000 is 0), then b
+		 must be less than 7, and the physical block number corresponding
+		 to b is the bth entry in the address portion of the i-node.
+
+                 If the file is large, b is divided by 64 to yield a number
+                 which must be less than 8 (or the file is too large for
+                 UNIX to handle). The corresponding slot in the i-node
+                 address portion gives the physical block number of an
+                 indirect block. The residue mod 64 gives a word offset
+                 in the indirect block, and the word found there is the
+		 physical address of the block corresponding to b.
+
+                 If block b in a file exists, it is not necessary that all
+                 blocks less than b exist. A zero block number either in the
+                 address words of the i-node or in an indirect block
+                 indicates that the corresponding block has never been
+                 allocated. Such a missing block reads as if it contained
+                 all zero words.
+
+FILES
+
+SEE ALSO          format of directories
+
+DIAGNOSTICS
+
+BUGS
+
+OWNER