NTFS: Prepare for 2.1.23 release: Update documentation and bump version.

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

2.1.23:

	- Stamp the user space journal, aka transaction log, aka $UsnJrnl, if

	  it is present and active thus telling Windows and applications using

	  the transaction log that changes can have happened on the volume

	  which are not recorded in $UsnJrnl.

	- Detect the case when Windows has been hibernated (suspended to disk)

	  and if this is the case do not allow (re)mounting read-write to

	  prevent data corruption when you boot back into the suspended

	  Windows session.

	- Implement extension of resident files using the normal file write

	  code paths, i.e. most very small files can be extended to be a little

	  bit bigger but not by much.

	- Improve handling of ntfs volumes with errors and strange boot sectors

	  in particular.

	- Fix various bugs.

2.1.22:

	- Improve handling of ntfs volumes with errors.

	- Fix various bugs and race conditions.

	- Enable the code for setting the NT4 compatibility flag when we start

	  making NTFS 1.2 specific modifications.

2.1.23-WIP

2.1.23 - Implement extension of resident files and make writing safe as well as

	 many bug fixes, cleanups, and enhancements...

	- Add printk rate limiting for ntfs_warning() and ntfs_error() when

	  compiled without debug.  This avoids a possible denial of service

	  attack.  Thanks to Carl-Daniel Hailfinger from SuSE for pointing this

	  out.

	- Fix compilation warnings on ia64.  (Randy Dunlap)

	- Use i_size_read() in fs/ntfs/attrib.c::ntfs_attr_set().

	- Use i_size_read() in fs/ntfs/logfile.c::ntfs_{check,empty}_logfile().

	- Use i_size_read() once and then use the cached value in

	  fs/ntfs/lcnalloc.c::ntfs_cluster_alloc().

	- Use i_size_read() in fs/ntfs/file.c::ntfs_file_open().

	- Use i_size_{read,write}() instead of reading i_size by hand and cache

	  the value where apropriate.

	- Add size_lock to the ntfs_inode structure.  This is an rw spinlock

	  and it locks against access to the inode sizes.  Note, ->size_lock

	  is also accessed from irq context so you must use the _irqsave and

	  _irqrestore lock and unlock functions, respectively.

	- Use i_size_read() in fs/ntfs/compress.c at the start of the read and

	  use the cached value afterwards.  Cache the initialized_size in the

	  same way and protect access to the two sizes using the size_lock.

	- Use i_size_read() in fs/ntfs/dir.c once and then use the cached

	  value afterwards.

	- Use i_size_read() in fs/ntfs/super.c once and then use the cached

	  value afterwards.  Cache the initialized_size in the same way and

	  protect access to the two sizes using the size_lock.

	  _irqrestore lock and unlock functions, respectively.  Protect all

	  accesses to allocated_size, initialized_size, and compressed_size.

	- Minor optimization to fs/ntfs/super.c::ntfs_statfs() and its helpers.

	- Use i_size_read() in fs/ntfs/inode.c once and then use the cached

	  value afterwards when reading the size of the bitmap inode.

	- Use i_size_{read,write}() in fs/ntfs/{aops.c,mft.c} and protect

	  access to the i_size and other size fields using the size_lock.

	- Implement extension of resident files in the regular file write code

	  paths (fs/ntfs/aops.c::ntfs_{prepare,commit}_write()).  At present

	  this only works until the data attribute becomes too big for the mft

	     index.o inode.o mft.o mst.o namei.o runlist.o super.o sysctl.o \

	     unistr.o upcase.o

EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.23-WIP\"

EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.23\"

ifeq ($(CONFIG_NTFS_DEBUG),y)

EXTRA_CFLAGS += -DDEBUG

		if (IS_ERR(rl)) {

			err = PTR_ERR(rl);

			ntfs_debug("Failed to allocate cluster%s, error code "

					"%i.\n", (new_size >>

					"%i.", (new_size >>

					vol->cluster_size_bits) > 1 ? "s" : "",

					err);

			goto page_err_out;