Simplest (practical) file system? - test-drb@ccmp.vtda.org

27 Jul 2003

...
 When a file is deleted, its directory entry is changed
to indicate that 
the file no longer exists, If a shorter file is then stored on the disk, 
then the directory entry is changed again for the new file. THis then 
leaves some unused blocks on the disk which can't be used becuase there's 
no way to create a directory entry in the right place in the directory. 
RT handles this by adding a directory entry to describe the unallocated 
portion of the previous free space.  This might mean having to move 
directory entries in a segment, and may require a segment split.

                                        Megan Gentry
                                        Former RT-11 Developer

+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL   | email: mbg at world.std.com         |
| Member of Technical Staff      |        megan at savaje.com          |
| SavaJe Technologies, Inc.      |             (s/ at /@/)             |
| 100 Apollo Drive               | URL:     http://world.std.com/~mbg/ |
| Chelmsford, MA 01460           | "pdp-11 programmer - some assembler |
| (978) 256 6521   (DEC '77-'98) |  required." - mbg            KB1FCA |
+--------------------------------+-------------------------------------+