TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

STRUUO [CALLI 50]
4 .FSUDS
Status bits. These are:
Bit
o
1
2
Symbol
FS.UWL
FS.USA
FS.UNC
Meaning
Software
write-lock.
(Meaningful only
for the first
unit in the
structure. )
Single-access
(not used) .
Prevent monitor
I/O on this
structure from
being cached.
5 . FSUGP
6 .FSUTL
7 . FSUBC
10 .FSUCS
Number of sequential blocks to
try for on sequential output (see
HOMGRP in the HOME block) .
Number of free blocks on unit,
minus a safety factor. The
suggested safety factor is one
block of safety for every 500
(decimal) blocks of disk. Do not
allocate safety blocks for the
swapping space. Thus, the
suggested safety factor is
(UNIBPU-HOMK4S*8)/500. This
value should be truncated to less
than 500 (decimal) blocks per
unit.
Number of blocks per clust:er (see
HOMBPC in the HOME block) .
Number of clusters per SAT (that
is, (UNIBPU/HOMBPC-l)/HOMSPU+l).
11 . FSUWS
Number of words per SAT
(.FSUCS-l) /36 + 1).
(t:hat is,
12 .FSUSC
13 .FSUSU
14 .FSUSP
Number of SATs in core
HOMSIC in the HOME block) .
Number of SATs per unit
HOMSPU in the HOME block) .
Pointer to SPT
(length"address) .
(see
(see
table
The format of the SPT table is:
Word
o
1
Contents
Pointer to 1st SAT block.
Pointer to 2nd SAT block.
n-l
Pointer to nth SAT block.
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