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* Tagged as ROL_FileCore-3_21

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Tagged as ROL_FileCore-3_20

Version 3.17 for Ursula. SWI DescribeDisc now reports the DiscVersion and RootDirSize parameters for the disc.

Tagged as aglover_FileCore-3_17.

 -

Altered s.Commands; *map now correctly reports big directories and a big
free space map.

Found a major inefficiency in the handling of file creation, closing of files and other uses of the NextFree function.  In the case of file creation, the problem was particularly bad on large free space maps, as the function was of order N^2 on the size of the map, when the disc was nearly full.  As the disc gets fuller, the problem gets worse; with 1400 zones in the map, N^2 is very large indeed.  This resulted in *cdir sometimes taking 1sec.

Now, a new function NextFree_Quick exists which performs similarly to NextFree,
but does not consider free spaces in zones beyond the current zone.  This
can be used by functions which need only examine free spaces in a given zone,
such as is the case in ClaimFreeSpace where it is stepping throigh zones to
find a single gap large enough for the entire file.

For other functions which work on a single zone, the speedup is less dramatic,
of the order N instead of N^2.

Fixed bug in handling of Service_EnumerateFormats which was preventing all formats being listed by ADFSFiler.

Fixed parent directory handling for big dirs (was filling in the Disc part of the field, which should be left as 0000s because the value of the disc changes over time).

Further fix for ADFSBuffers (illegal pointer accessing) as it was found that
the previous fix wasn't good enough.  New fix appears to work where previous
failed.

Fixed 4 bugs in DoOsFunRenameBigDir involving renameing of objects between dirs with long filenames.

Fixed bug in OsFunResolveWildcard on long filenames.

Binary-chop dir scanning fixed.  (BigLexEqv fixed so that it doesn't try to compare the dir separator '.' in eg "Default.Thing" with another object called "Default+" (was breaking binary chop dir search).

Fixed IdentifyDisc (s.Identify); old behaviour left the RootDir field
invalid (the disc bits were an external drive number, instead of an
internal disc number).  This causes problems if the disc fails to mount
due to, for example, memory problems, as the illegal value never gets
fixed (normally, MountDiscOnDrive would end up correcting the problem).

1) Fixed ReallyShared so that it doesn't omit to check the first
   object in the directory being scanned.

2) Fixed a long-standing ADFSBuffers problem.  This involves the
   UpdateBufState function attempting to attach a buffer as the
   Older or Younger buffer of the previous or next buffer in a
   file respectively.  Unfortunately, if there's only one buffer
   for a file, then it may attempt to attach it to the file
   control block - which is wrong.  Modified UpdateBufState to
   only attempt this when there are more than one objects in
   the chain.  Note:  there still may be problems in certain
   cases; this may need further looking into.

   This problem probably doesn't occur without long file names
   support enabled, because the fcb's contents look different
   then (name field is 10 chars instead of 256) so the problem
   is less likely to occur accidentally.

DoOsFunRenameBigDir to work when renaming a shared file between dirs where
the file ends up as the last object in the target dir.

SanityCheckEDiscRecord to allow idlen>15 when DiscVersion=0

GrowBigDir to round up desired size to a multiple of the disc allocation
size.

Also:

Implemented non-working code to write cache the dir buffer.  WriteCacheDir
compile switch set to FALSE in s.DebugOpts.  Don't set it to TRUE unless
I tell you it's working.

Made SortDir not attempt to sort more than 2047 entries in a dir, to
avoid it overflowing ScratchSpace.

Made SortPair do one extra shell on the sort (makes it more efficient).

Fixed s.BigDirCode (GrowBigDir and ShrinkBigDir) to cope with BitSize<SecSize and rewrote free space map memory management to place free space maps in dynamic areas.

Fixed bugs in handling of growing directories, and made the directory backup entries come back but only be one word long each.

Altered directory format (change backup dir entries to be one word instead of an entire copy of the entry).  Also reduced size of a directory entry by one word.  Also fixed a number of small bugs.

Only FileCore_LayoutStructure and FileCore_FloppyStructure remain to
updated for long file names.

Fixed a bug with NewClaimFree (and its use of SortDir) which caused problems with 16 bit object ids.  Now copes with long ids correctly.

Started on bits of code for the long file names work.

Changes made to FileCore to support allowing idlen more than 15.  This allows smaller LFAUs on discs.  The changes are not yet complete.  In particular, the number of disc zones is limited to 255.  Some development testing has been peformed, and the filing system is generally stable.  Areas which haven't been fully tested include things like *Defect, FileCore_LayoutStructure,

FileCore_FloppyStructure, and the FileSwitch APIs for reading and examining
a disc's used space.

This version should not be used for any OS Builds with the BigMaps flag set
to true.  It should build as a normal version of FileCore with BigMaps and
BigDirs set to false.

Sprout from master 1996-11-21 12:32:35 UTC Neil Turton <nturton@gitlab.riscosopen.org> 'Initial revision'
Cherrypick from StrongARM 1996-11-06 00:03:34 UTC Neil Turton <nturton@gitlab.riscosopen.org> 'Import from cleaned 370 CD':
    patch/!Run,feb
    patch/UK/!RUNIMAGE,ffb
    patch/UK/!Run,feb
    patch/UK/Messages
    patch/diffs
Delete:
    Diffs

Sprout from master 1996-11-05 09:32:39 UTC Neil Turton <nturton@gitlab.riscosopen.org> 'Import from cleaned 360 CD'
Delete:
    Diffs