release-notes

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===== Release notes for ftape-3.04d 25/11/97 =====
- The correct pre-processor statement for "else if" is "#elif" not
  "elsif".
- Need to call zft_reset_position() when overwriting cartridges
  previously written with ftape-2.x, sftape, or ancient
  (pre-ftape-3.x) versions of zftape.

===== Release notes for ftape-3.04c 16/11/97 =====
- fdc_probe() was calling DUMPREGS with a result length of "1" which
  was just fine. Undo previous change.

===== Release notes for ftape-3.04b 14/11/97 =====

- patches/2.x.x/floppy.c.diff was somewhat broken, releasing i/o
  regions it never had allocated.
- fdc_probe() was calling DUMPREGS with a result length of "1" instead
  of "10"
- Writing deleted data marks if the first segents on track zero are
  should work now.
- ftformat should now be able to handle those cases where the tape
  drive sets the read only status bit (QIC-40/80 cartridges with
  QIC-3010/3020 tape drives) because the header segment is damaged.
- the MTIOCFTCMD ioctl may now be issued by the superuser ONLY.

===== Release notes for ftape-3.04a 12/11/97 =====
- Fix an "infinite loop can't be killed by signal" bug in
  ftape_get_drive_status(). Only relevant when trying to access
  buggy/misconfigured hardware
- Try to compensate a bug in the HP Colorado T3000's firmware: it
  doesn't set the write protect bit for QIC80/QIC40 cartridges.

===== Release notes for ftape-3.04 06/11/97 =====
- If positioning with fast seeking fails fall back to a slow seek
  before giving up.
- (nearly) no retries on "no data errors" when verifying after
  formatting. Improved tuning of the bad sector map after formatting.
- the directory layout has changed again to allow for easier kernel
  integration
- Module parameter "ftape_tracing" now is called "ft_tracing" because
  the "ftape_tracing" variable has the version checksum attached to it.
- `/proc/ftape' interface for 2.0.* kernels. `/proc/ftape' no longer
  is a directory but a file that contains all the information formerly
  provided in separate files under the `/proc/ftape/' directory.
- Most of the configuration options have been prefixed by "CONFIG_FT_"
  in preparation of the kernel inclusion. The Makefiles under
  "./ftape/" should be directly usable by the kernel.
- The MODVERSIONS stuff is now auto-detected.
- Broke backslashed multi line options in MCONFIG into separate lines
  using GNU-make's "+=" feature.
- The html and dvi version of the manual is now installed under
  '/usr/doc/ftape` with 'make install`
- New SMP define in MCONFIG. ftape works with SMP if this is defined.
- attempt to cope with "excessive overrun errors" by gradually
  increasing FDC FIFO threshold. But this doesn't seem to have too
  much an effect.
- New load time configuration parameter "ft_fdc_rate_limit". If you
  encounter too many overrun errors with a 2Mb controller then you
  might want to set this to 1000.
- overrun errors on the last sector in a segment sometimes result in
  a zero DMA residue. Dunno why, but compensate for it.
- there were still fdc_read() timeout errors. I think I have fixed it
  now, please FIXME.
- Sometimes ftape_write() failed to re-start the tape drive when a
  segment without a good sector was reached ("wait for empty segment
  failed"). This is fixed. Especially important for > QIC-3010.
- sftape (aka ftape-2.x) has vanished. I didn't work on it for
  ages. It is probably still possible to use the old code with
  ftape-3.04, if one really needs it (BUT RECOMPILE IT)
- zftape no longer alters the contents of already existing volume
  table entries, which makes it possible to fill in missing fields,
  like time stamps using some user space program.
- ./contrib/vtblc/ contains such a program.
- new perl script ./contrib/scripts/listtape that list the contents of a
  floppy tape cartridge parsing the output of "mt volinfo" + "mt fsf"
- the MTWEOF implementation has changed a little bit (after I had a
  look at amanda). Calling MTWEOF while the tape is still held open
  after writing something to the tape now will terminate the current
  volume, and start a new one at the current position.
- the volume table maintained by zftape now is a doubly linked list
  that grows dynamically as needed.

  formatting floppy tape cartridges
  ---------------------------------
  * there is a new user space formatting program that does most of the
    dirty work in user space (auto-detect, computing the sector
    coordinates, adjusting time stamps and statistics). It has a
    simple command line interface.
  * ftape-format.o has vanished, it has been folded into the low level
    ftape.o module, and the ioctl interface into zftape.o. Most of the
    complicated stuff has been moved to user space, so there was no
    need for a separate module anymore.
  * there is a new ioctl MTIOCFTCMD that sends a bare QIC-117 command
    to the tape drive.
  * there is a new mmap() feature to map the dma buffers into user
    space to be used by the user level formatting program.
  * Formatting of yet unformatted or totally degaussed cartridges
    should be possible now. FIXME.

===== Release notes for ftape-3.03b, <forgot the exact date> ====

ftape-3.03b was released as a beta release only. Its main new feature
was support of the DITTO-2GB drive. This was made possible by reverse
engineering done by <fill in his name> after Iomega failed to support
ftape. Although they had promised to do so (this makes me feel a bit
sad and uncomfortable about Iomega).

===== Release notes for ftape-3.03a, 22/05/97 ====

- Finally fixed auto-un-loading of modules for kernels > 2.1.18
- Add an "uninstall" target to the Makefile
- removed the kdtime hack
- texi2www didn't properly set the back-reference from a footnote back
  to the regular text.

  zftape specific
  ---------------
  * hide the old compression map volume. Taper doesn't accept the
    presence of non-Taper volumes and Taper-written volume on the same
    tape.
  * EOD (End Of Data) handling was still broken: the expected behavior
    is to return a zero byte count at the first attempt to read past
    EOD, return a zero byte count at the second attempt to read past
    EOD and THEN return -EIO.
  
  ftape-format specific
  ---------------------
  * Detection of QIC-40 cartridges in select_tape_format() was broken
    and made it impossible to format QIC-3010/3020 cartridges.
  * There are strange "TR-1 Extra" cartridges out there which weren't
    detected properly because the don't strictly conform to the
    QIC-80, Rev. N, spec.

===== Release notes for ftape-3.03, 30/04/97 =====

- Removed kernel integration code from the package. I plan to provide
  a package that can be integrated into the stock kernel separately
  (hopefully soon).
  As a result, a simple `make' command now will build everything.
- ALL compile time configuration options have been moved to the file
  `MCONFIG'.
- Quite a few `low level' changes to allow formatting of cartridges.
- formatting is implemented as a separate module `ftape-format.o'. The
  modified `mt' program contains sample code that shows how to use it.
- The VFS interface has been moved from the `ftape.o' module to the
  high level modules `zftape.o' resp. `sftape.o'. `ftape.o' contains
  the hardware support only.
- A bit of /proc support for kernels > 2.1.28
- Moved documentation to Doc subdir. INSTALL now contains some real
  installation notes.
- `install' target in Makefile.

zftape specific:
----------------

- zftape works for large cartridges now ( > 2^31 bytes)
- MTIOCVOLINFO and MTIOCGETSIZE now return the size in KILOBYTES,
  NO LONGER in bytes.

- permissions for write access to a cartridge have changed:
  * zftape now also takes the file access mode into account
  * zftape no longer allows writing in the middle of the recorded
    media. The tape has to be positioned at BOT or EOD for write
    access.

- MTBSF has changed. It used to position at the beginning of the
  previous file when called with count 1. This was different from the
  expected behavior for other Un*x tape drivers (i.e. SCSI). MTBSF
  with count 1 should merely position at the beginning of the current
  volume. Fixed. As a result, `tar --verify' now produces the desired
  result: it verifies the last written volume, not the pre-last
  written volume.

- The compression map has vanished --> no need for `mt erase' any
  more. Fast seeking in a compressed volume is still be possible, but
  takes slightly longer. As a side effect, you may experience an
  additional volume showing up in front of all others for old
  cartridges. This is the tape volume that holds the compression map.

- The compression support for zftape has been moved to a separate
  module `zft-compressor'. DON'T forget to load it before trying to
  read back compressed volumes. The stock `zftape.o' module probes for
  the module `zft-compressor' using the kerneld message channel; you
  have to install `zft-compressor.o' in a place where modprobe can
  find it if you want to use this.

- New experimental feature that tries to get the broken down GMT time
  from user space via a kernel daemon message channel. You need to
  compile and start the `kdtime' daemon contained in the contrib
  directory to use it. Needed (?) for time stamps in the header
  segments and the volume table.

- variable block size mode via MTSETBLK 0

- keep modules locked in memory after the block size has been changed

sftape specific:
----------------

- end of tape handling should be fixed, i.e. multi volume archives
  written with `afio' can be read back now.


===== Release notes for ftape-3.02a, 09/01/97 =====

No big news:
- call zft_init() resp. sft_init() when compiling the entire stuff
  into the kernel image.
- fix bug in ftape-setup.c when NO_TRACE_AT_ALL was defined.
- fix bug in sftape-eof.c/zftape-eof.c for old kernels (1.2.*)
- add support for new module interface for recent kernels

===== Release notes for ftape-3.02, 16/12/96 =====
- Fixed the `FDC unlock command failed' bug in fdc-io.c. When the FIFO
  was already locked when ftape was loaded, ftape failed to unlock it.
- Fixed compilation of `contrib/gnumt'. It now finds `mtio.h' even if
  ftape is NOT included into the kernel source tree.
- fc-10.c: include <asm/io.h> for inb() and outb().
- ftape/sftape/zftape: all global variable now have either a `ftape_',
  a `ft_', `sft_', `zft_' or `qic_' prefix to prevent name clashes
  with other parts of the kernel when including ftape into the kernel
  source tree.
- Kerneld support has changed. `ftape' now searches for a module
  `ftape-frontend' when none of the frontend (`sftape' or `zftape') is
  loaded. Please refer to the `Installation/Loading ftape' section of
  the TeXinfo manual.
- Add load resp. boot-time configuration of ftape. There are now
  variables ft_fdc_base, ft_fdc_dma and ft_fdc_irq corresponding to
  the former FDC_BASE etc. compile time definitions. One can also use
  the kernel command line parameters to configure the driver if it is
  compiled into the kernel. Also, the FC-10/FC-20 support is load-time
  configurable now as well as the MACH-II hack (ft_probe_fc10,
  resp. ft_mach2). Please refer to the section `Installation/Configure
  ftape' of the TeXinfo manual.
- I removed the MODVERSIONS option from `Makefile.module'. Let me alone
  with ftape and MODVERSIONS unless you include the ftape sources into
  the kernel source tree.
- new vendors in `vendors.h':
  * HP Colorado T3000 
  * ComByte DoublePlay (including a bug fix for their broken
    formatting software, thanks to [e-mail])
  * Iomega DITTO 2GIG. NOTE: this drive cannot work with ftape because
    the logical data layout of the cartridges used by this drive does
    NOT conform to the QIC standards, it is a special Iomega specific
    format. I've sent mail to Iomega but didn't receive an answer
    yet. If you want this drive to be supported by ftape, ask Iomega
    to give me information about it.
- zftape:
  * re-introduced the MTIOC_ZFTAPE_GETBLKSZ ioctl for compatibility
    with zftape 1.06a and earlier. Please don't use it when writing
    new software, use the MTIOCVOLINFO ioctl instead.
  * Major overhaul of the code that updates the header segments. Never
    change the tape label unless erasing the tape. Thus we almost
    never need to write the header segments, unless we would modify
    the bad sector map which isn't done yet. Updating of volume table
    and compression map more secure now although it takes a bit
    longer.
  * Fixed bug when aborting a write operation with a signal: zftape
    now finishes the current volume (i.e. writes an eof marker) at the
    current position. It didn't before which led to somehow *strange*
    behavior in this cases.
  * Keep module locked in memory when using it with  the non-rewinding
    devices and the tape is not logical at BOT. Needed for kerneld
    support.
- sftape:
  * Keep module locked in memory when using it with  the non-rewinding
    devices and the tape is not logical at BOT. Needed for kerneld
    support.

===== Release notes for ftape-3.01, 14/11/96 =====

- Fixed silly bugs in ftape-3.00:
  * MAKEDEV.ftape: major device number must be 27, not 23 
  * sftape/sftape-read.c: sftape_read_header_segments() called 
    itself recursively instead of calling ftape_read_header_segment()
  * zftape/qic-vtbl.h: conversion of ftape's file marks to zftape's
    internal volume table was broken.
  * patches/2.x.x/linux-2.0.21.dif: my RCS (resp. CVS) system replaced
    the `$Revison:' etc. macros in the `ftape.h' concerning part of the
    patch :-( Fixed.
  * info/ftape.info: Fixed misspellings (`cp' <-> `cp -r' etc.)
  * when ftape/sftape or ftape/zftape was compiled into the kernel the
    variable ftape_status was declared twice. Fixed.
  * removed reference to undeclared variable kernel_version when not
    compiling as module
  * fixed a bug introduced by the use of bit-fields for some flags
    (i.e. write_protected, no_cartridge, formatted)
  * flag `header_read' is now reset correctly to zero when tape is
    removed.
- fixed a bug in sftape/sftape-eof.c that was already in the original
  ftape code. MTFSF/BSF was not handled correctly when positioned
  right before the file mark (think of tar)
- Changed TRACE macros (following a suggestion of Marcin Dalecki) to use
  the predefined __FUNCTION__ macro of GCC. Spares about 4k of code.
- added new vendor id for Iomega DITTO 2GIG
- fixed a bug already present in zftape-1.06 when aborting a write
  with a signal: we now finish the current volume at that
  position. Header segments remain NOT up to date until an explicit call
  to MTREW or MTOFFL is done.  

===== Release notes for ftape-3.00, 14/10/96 =====

- Merged ftape with zftape. There are three modules now:
  ftape for the hardware support, sftape for the implementation of the
  original ftape eof mark stuff and zftape that implements zftape's way
  of handling things (compression, volume table, tape blocks of
  constant length)
- Documentation in TeXinfo format in the `info' subdirectory.
- New ioctls for zftape. See zftape/zftape.h
- Dummy formatting ioctl for ftape. See ftape.h
- Kernel patch files for the 2.*.* series to include ftape-3.00 in the
  kernel source tree. These includes a kernel compatible Config.in
  script and fairly large online information for the kernel configure
  script.
- Support for compiling with Linux-1.2.13. 
- Modified GNU mt from their cpio package that can handle the new
  ioctls.
- ftape/sftape/zftape is kerneld save now!

Notes on sftape:
- sftape implements the eof handling code of the original ftape. If
  you like to stick with the original ftape stuff, you have to use