FAT12 1..4084
FAT16 4085..65524
FAT32 65525..
This is required for interoperability with other FAT implementations,
and in particular UEFI.
Obtained from: NetBSD
Sponsored by: The FreeBSD Foundation
The fields from deMTime and deMDate in the DOS directory entry
are actually the last-modified time/date.
According to some online documentation these are the only
timestamps available in FAT12/FAT16.
MFC after: 3 days
- Simplify diagnostic messages.
- Adopt lowercase first letters to make the messages
more canonical.
PR: bin/175404
Submitted by: Christoph Mallon
Reviewed by: bde
MFC after: 3 days
The reasoning behind this, is that if we are consistent in our
documentation about the uint*_t stuff, people will be less tempted to
write new code that uses the non-standard types.
I am not going to bump the man page dates, as these changes can be
considered style nits. The meaning of the man pages is unaffected.
MFC after: 1 month
Remove C99 initializers: they don't help in this case.
Set errno to 0 before strtoll() (from NetBSD).
PR: 151850
Suggested by: bde
Approved by: jhb (Mentor)
MFC after: 2 weeks
change the on-disk format in an incompatible way. Without this change,
msdosfs created on FreeBSD/arm would not be mountable.
PR: bin/162486
Submitted by: Ian Lepore <freebsd damnhippie dyndns org>
Reported by: Mattia Rossi <mrossi at swin.edu.au>
MFC after: 3 days
-S option is meant to be "inclusive".
The original issue of the PR was already fixed.
PR: docs/142418
Submitted by: David Naylor (naylor dot b dot david at gmail dot com)
No objection from: kib
MFC after: 5 days
- C99 initializers.
- Change the default volume label from "NO NAME" to "NO_NAME".
- Set OEM String to "BSD4.4 " following the unnamed spacing convention
in that other OS that suggests "MSWIN4.1"
Also, David Naylor's changes for Clang, mostly changing the signess
of constants.
Submitted by: Pedro F. Giffuni <giffunip tutopia com>
Clang fixes by: David Naylor <naylor.b.david gmail com>
Reviewed by: bde (with some disagreement about Clang issues)
MFC after: 2 weeks
fstat(fd, &sb) was not executed unconditionally anymore so sb was read
uninitialised when -C is used.
Submitted by: Christoph Mallon <christoph mallon gmx de>
Either use parameters provided by user or make them up.
The code for faking CHS params is borrowed from disklabel code.
The logic for using user-provided and auto-guessed parameters is not
perfect, so to speak.
PR: bin/121182
Approved by: jhb (mentor)
when preparing images for emulators or flash devices:
+ option '-C size' to create the underlying image file with given size.
Saves doing a 'dd' before, and especially it creates a sparse file
+ option '-@ offset' to build the FAT image at the specified offset
in the image file or device;
+ make the cluster size adaptive on the filesystem size.
Previously the default was 4k which is really unconvenient with
large media; now it goes from 512 bytes to 32k depending on
filesystem size (i still need to check whether it makes sense
to go further up, to 64k or above);
+ fix default geometry when not specified on the command line,
use 63 sectors/255 heads by default.
Also trim the size so it exactly a multiple of a track, to avoid
complaints in some filesystem code.
+ document all the above, plus some manual page clarifications.
MFC after: 4 weeks
a plain file and a geometry is not explicitly supplied through
command line or disktab entry.
This way you can a FAT image on a file as simply as this:
newfs_msdos ./some/file
(right now you need a much longer command
newfs_msdos -h 32 -u 64 -S 512 -s $total_blocks -o 0 ./some/file
Will be merged after 7.1 and 6.4 are released.
See also the related PR which suggests a similar change.
PR: bin/121182
MFC after: 4 weeks
correct place on large sector disks. The boot signature should be at
offset 0x1fe in the BPB; newfs_msdos currently stores it 2 bytes from
the end of the sector.
Taken from: NetBSD
- Initialize everything in the struct array, not only the mentioned
ones
- Unconditionally initialize hs to 0 to avoid repeatly doing so
- Cast to unsigned int when comparing to unsigned variables.
