bin/132237: msdosfs has problems to read MSDOS Floppy

[Jin Guojun]

>Number:         132237
>Category:       bin
>Synopsis:       msdosfs has problems to read MSDOS Floppy
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 02 00:40:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Jin Guojun
>Release:        6.3-R and 7.1-R
>Organization:
>Environment:
FreeBSD BSD.Belkin 7.1-RELEASE FreeBSD 7.1-RELEASE #0: Sat Jan 10 20:47:04 PST 2009     root at BSD.Belkin:/usr/src/sys/i386/compile/MinMax  i386

>Description:
msdosfs does not like some files created by DOS 6.3 on a floppy disk:
 
[120] BSD.Belkin: mount_msdosfs -o ro /dev/fd0 /mnt
[121] BSD.Belkin: ll /mnt
ls: MA0-2008.TAB: No such file or directory
ls: ST-2008.TAB: No such file or directory
total 756
drwxr-xr-x   1 root  wheel    7168 Jan  1  1980 ./
drwxr-xr-x  23 root  wheel     512 Mar  1 15:16 ../
-rwxr-xr-x   1 root  wheel  265388 Jan  3 21:39 LAST.ZIP*
-rwxr-xr-x   1 root  wheel    9788 Feb 21  2008 MAO-2007.TAB*
-rwxr-xr-x   1 root  wheel    3348 Jan  5  2008 PRIM2007.TAB*
-rwxr-xr-x   1 root  wheel    1800 Mar  1 14:39 PRIM2008.TAB*
-rwxr-xr-x   1 root  wheel     752 Jan  5  2008 ST-2007.TAB*

00 00 00 00 00 A0 41 1B - C4 41 1D E4 41 1F 04 42   ......A..A..A..B  0000001A20
21 24 42 23 44 42 25 F4 - FF 00 00 00 00 00 00 00   !$B#DB%.........  0000001A30
00 00 FF 0F 00 00 00 00 - 00 00 00 00 00 00 00 00   ................  0000001A40
00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00   ................  0000001A50
** 00 ... skipped 186[BAH] lines
53 54 2D 32 30 30 37 20 - 54 41 42 20 00 00 00 00   ST-2007 TAB ....  0000002600
00 00 00 00 00 00 C2 A2 - 25 38 02 00 F0 02 00 00   ........%8......  0000002610
50 52 49 4D 32 30 30 37 - 54 41 42 20 00 00 00 00   PRIM2007TAB ....  0000002620
00 00 00 00 00 00 D8 A2 - 25 38 04 00 14 0D 00 00   ........%8......  0000002630
4D 41 4F 2D 32 30 30 37 - 54 41 42 20 00 00 00 00   MAO-2007TAB ....  0000002640
00 00 61 38 00 00 B0 AD - 55 38 0B 00 3C 26 00 00   ..a8....U8..<&..  0000002650
4C 41 53 54 20 20 20 20 - 5A 49 50 20 00 00 00 00   LAST    ZIP ....  0000002660
00 00 00 00 00 00 FC AC - 23 3A 1E 00 AC 0C 04 00   ........#:......  0000002670
41 78 00 78 00 78 00 00 - 00 FF FF 0F 00 7A FF FF   Ax.x.x.......z..  0000002680
FF FF FF FF FF FF FF FF - FF FF 00 00 FF FF FF FF   ................  0000002690
53 54 2D 32 30 30 38 20 - 54 41 42 20 00 00 00 00   ST-2008 TAB ....  00000026A0
00 00 61 3A 00 00 8B 74 - 61 3A 26 02 F5 01 00 00   ..a:...ta:&.....  00000026B0
50 52 49 4D 32 30 30 38 - 54 41 42 20 00 00 00 00   PRIM2008TAB ....  00000026C0
00 00 00 00 00 00 F7 74 - 61 3A 27 02 08 07 00 00   .......ta:'.....  00000026D0
41 31 00 30 00 33 00 39 - 00 2E 00 0F 00 C7 73 00   A1.0.3.9......s.  00000026E0
61 00 63 00 00 00 FF FF - FF FF 00 00 FF FF FF FF   a.c.............  00000026F0
4D 41 30 2D 32 30 30 38 - 54 41 42 20 00 00 00 00   MA0-2008TAB ....  0000002700
00 00 61 3A 00 00 41 77 - 61 3A 2B 02 0A 16 00 00   ..a:..Awa:+.....  0000002710

After insert this floppy on a W2K machine and copy them to C:/ and copy them back on to the floppy, the FAT table seems changed and msdosfs is happy:
(original table entries are marked as E5 -- ereased)

4D 41 30 2D 32 30 30 38 - 54 41 42 20 00 8F 2E 80   MAO-2008TAB ....  0000003980
61 3A 61 3A 00 00 41 77 - 61 3A 2B 02 0A 16 00 00   a:a:..Awa:+.....  0000003990
53 54 2D 32 30 30 38 20 - 54 41 42 20 00 5C 25 80   ST-2008 TAB .\%.  00000039A0
61 3A 61 3A 00 00 8B 74 - 61 3A 26 02 F5 01 00 00   a:a:...ta:&.....  00000039B0

All of files on this floppy are created by MSDOS 6.3. 
>How-To-Repeat:
No sure MS-DOS 6.3 will always create such FAT entries, which are readable by MS OSs, but FreeBSD.

FAT tables (before and after) are provided in description section. I will keep this floppy in case further may be needed for debug.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: