ntfs.txt

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For linear raid, just change the raid-level above to "raid-level linear", for
mirrors, change it to "raid-level 1", and for stripe sets with parity, change
it to "raid-level 5".

Note for stripe sets with parity you will also need to tell the MD driver
which parity algorithm to use by specifying the option "parity-algorithm
which", where you need to replace "which" with the name of the algorithm to
use (see man 5 raidtab for available algorithms) and you will have to try the
different available algorithms until you find one that works.  Make sure you
are working read-only when playing with this as you may damage your data
otherwise.  If you find which algorithm works please let us know (email the
linux-ntfs developers list [e-mail] or drop in on
IRC in channel #ntfs on the irc.freenode.net network) so we can update this
documentation.

Once the raidtab is setup, run for example raid0run -a to start all devices or
raid0run /dev/md0 to start a particular md device, in this case /dev/md0.

Then just use the mount command as usual to mount the ntfs volume using for
example:	mount -t ntfs -o ro /dev/md0 /mnt/myntfsvolume

It is advisable to do the mount read-only to see if the md volume has been
setup correctly to avoid the possibility of causing damage to the data on the
ntfs volume.


Limitiations when using the MD driver
=====================================

Using the md driver will not work properly if any of your NTFS partitions have
an odd number of sectors.  This is especially important for linear raid as all
data after the first partition with an odd number of sectors will be offset by
one or more sectors so if you mount such a partition with write support you
will cause massive damage to the data on the volume which will only become
apparent when you try to use the volume again under Windows.

So when using linear raid, make sure that all your partitions have an even
number of sectors BEFORE attempting to use it.  You have been warned!


ChangeLog
=========

Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.

2.1.20:
	- Fix two stupid bugs introduced in 2.1.18 release.
2.1.19:
	- Minor bugfix in handling of the default upcase table.
	- Many internal cleanups and improvements.  Many thanks to Linus
	  Torvalds and Al Viro for the help and advice with the sparse
	  annotations and cleanups.
2.1.18:
	- Fix scheduling latencies at mount time.  (Ingo Molnar)
	- Fix endianness bug in a little traversed portion of the attribute
	  lookup code.
2.1.17:
	- Fix bugs in mount time error code paths.
2.1.16:
	- Implement access time updates (including mtime and ctime).
	- Implement fsync(2), fdatasync(2), and msync(2) system calls.
	- Enable the readv(2) and writev(2) system calls.
	- Enable access via the asynchronous io (aio) API by adding support for
	  the aio_read(3) and aio_write(3) functions.
2.1.15:
	- Invalidate quotas when (re)mounting read-write.
	  NOTE:  This now only leave user space journalling on the side.  (See
	  note for version 2.1.13, below.)
2.1.14:
	- Fix an NFSd caused deadlock reported by several users.
2.1.13:
	- Implement writing of inodes (access time updates are not implemented
	  yet so mounting with -o noatime,nodiratime is enforced).
	- Enable writing out of resident files so you can now overwrite any
	  uncompressed, unencrypted, nonsparse file as long as you do not
	  change the file size.
	- Add housekeeping of ntfs system files so that ntfsfix no longer needs
	  to be run after writing to an NTFS volume.
	  NOTE:  This still leaves quota tracking and user space journalling on
	  the side but they should not cause data corruption.  In the worst
	  case the charged quotas will be out of date ($Quota) and some
	  userspace applications might get confused due to the out of date
	  userspace journal ($UsnJrnl).
2.1.12:
	- Fix the second fix to the decompression engine from the 2.1.9 release
	  and some further internals cleanups.
2.1.11:
	- Driver internal cleanups.
2.1.10:
	- Force read-only (re)mounting of volumes with unsupported volume
	  flags and various cleanups.
2.1.9:
	- Fix two bugs in handling of corner cases in the decompression engine.
2.1.8:
	- Read the $MFT mirror and compare it to the $MFT and if the two do not
	  match, force a read-only mount and do not allow read-write remounts.
	- Read and parse the $LogFile journal and if it indicates that the
	  volume was not shutdown cleanly, force a read-only mount and do not
	  allow read-write remounts.  If the $LogFile indicates a clean
	  shutdown and a read-write (re)mount is requested, empty $LogFile to
	  ensure that Windows cannot cause data corruption by replaying a stale
	  journal after Linux has written to the volume.
	- Improve time handling so that the NTFS time is fully preserved when
	  converted to kernel time and only up to 99 nano-seconds are lost when
	  kernel time is converted to NTFS time.
2.1.7:
	- Enable NFS exporting of mounted NTFS volumes.
2.1.6:
	- Fix minor bug in handling of compressed directories that fixes the
	  erroneous "du" and "stat" output people reported.
2.1.5:
	- Minor bug fix in attribute list attribute handling that fixes the
	  I/O errors on "ls" of certain fragmented files found by at least two
	  people running Windows XP.
2.1.4:
	- Minor update allowing compilation with all gcc versions (well, the
	  ones the kernel can be compiled with anyway).
2.1.3:
	- Major bug fixes for reading files and volumes in corner cases which
	  were being hit by Windows 2k/XP users.
2.1.2:
	- Major bug fixes aleviating the hangs in statfs experienced by some
	  users.
2.1.1:
	- Update handling of compressed files so people no longer get the
	  frequently reported warning messages about initialized_size !=
	  data_size.
2.1.0:
	- Add configuration option for developmental write support.
	- Initial implementation of file overwriting. (Writes to resident files
	  are not written out to disk yet, so avoid writing to files smaller
	  than about 1kiB.)
	- Intercept/abort changes in file size as they are not implemented yet.
2.0.25:
	- Minor bugfixes in error code paths and small cleanups.
2.0.24:
	- Small internal cleanups.
	- Support for sendfile system call. (Christoph Hellwig)
2.0.23:
	- Massive internal locking changes to mft record locking. Fixes
	  various race conditions and deadlocks.
	- Fix ntfs over loopback for compressed files by adding an
	  optimization barrier. (gcc was screwing up otherwise ?)
	Thanks go to Christoph Hellwig for pointing these two out:
	- Remove now unused function fs/ntfs/malloc.h::vmalloc_nofs().
	- Fix ntfs_free() for ia64 and parisc.
2.0.22:
	- Small internal cleanups.
2.0.21:
	These only affect 32-bit architectures:
	- Check for, and refuse to mount too large volumes (maximum is 2TiB).
	- Check for, and refuse to open too large files and directories
	  (maximum is 16TiB).
2.0.20:
	- Support non-resident directory index bitmaps. This means we now cope
	  with huge directories without problems.
	- Fix a page leak that manifested itself in some cases when reading
	  directory contents.
	- Internal cleanups.
2.0.19:
	- Fix race condition and improvements in block i/o interface.
	- Optimization when reading compressed files.
2.0.18:
	- Fix race condition in reading of compressed files.
2.0.17:
	- Cleanups and optimizations.
2.0.16:
	- Fix stupid bug introduced in 2.0.15 in new attribute inode API.
	- Big internal cleanup replacing the mftbmp access hacks by using the
	  new attribute inode API instead.
2.0.15:
	- Bug fix in parsing of remount options.
	- Internal changes implementing attribute (fake) inodes allowing all
	  attribute i/o to go via the page cache and to use all the normal
	  vfs/mm functionality.
2.0.14:
	- Internal changes improving run list merging code and minor locking
	  change to not rely on BKL in ntfs_statfs().
2.0.13:
	- Internal changes towards using iget5_locked() in preparation for
	  fake inodes and small cleanups to ntfs_volume structure.
2.0.12:
	- Internal cleanups in address space operations made possible by the
	  changes introduced in the previous release.
2.0.11:
	- Internal updates and cleanups introducing the first step towards
	  fake inode based attribute i/o.
2.0.10:
	- Microsoft says that the maximum number of inodes is 2^32 - 1. Update
	  the driver accordingly to only use 32-bits to store inode numbers on
	  32-bit architectures. This improves the speed of the driver a little.
2.0.9:
	- Change decompression engine to use a single buffer. This should not
	  affect performance except perhaps on the most heavy i/o on SMP
	  systems when accessing multiple compressed files from multiple
	  devices simultaneously.
	- Minor updates and cleanups.
2.0.8:
	- Remove now obsolete show_inodes and posix mount option(s).
	- Restore show_sys_files mount option.
	- Add new mount option case_sensitive, to determine if the driver
	  treats file names as case sensitive or not.
	- Mostly drop support for short file names (for backwards compatibility
	  we only support accessing files via their short file name if one
	  exists).
	- Fix dcache aliasing issues wrt short/long file names.
	- Cleanups and minor fixes.
2.0.7:
	- Just cleanups.
2.0.6:
	- Major bugfix to make compatible with other kernel changes. This fixes
	  the hangs/oopses on umount.
	- Locking cleanup in directory operations (remove BKL usage).
2.0.5:
	- Major buffer overflow bug fix.
	- Minor cleanups and updates for kernel 2.5.12.
2.0.4:
	- Cleanups and updates for kernel 2.5.11.
2.0.3:
	- Small bug fixes, cleanups, and performance improvements.
2.0.2:
	- Use default fmask of 0177 so that files are no executable by default.
	  If you want owner executable files, just use fmask=0077.
	- Update for kernel 2.5.9 but preserve backwards compatibility with
	  kernel 2.5.7.
	- Minor bug fixes, cleanups, and updates.
2.0.1:
	- Minor updates, primarily set the executable bit by default on files
	  so they can be executed.
2.0.0:
	- Started ChangeLog.