ToDo/Notes:
- Find and fix bugs.
- In between ntfs_prepare/commit_write, need exclusion between
simultaneous file extensions. This is given to us by holding i_sem
on the inode. The only places in the kernel when a file is resized
are prepare/commit write and truncate for both of which i_sem is
held. Just have to be careful in readpage/writepage and all other
helpers not running under i_sem that we play nice...
Also need to be careful with initialized_size extention in
ntfs_prepare_write. Basically, just be _very_ careful in this code...
UPDATE: The only things that need to be checked are read/writepage
which do not hold i_sem. Note writepage cannot change i_size but it
needs to cope with a concurrent i_size change, just like readpage.
Also both need to cope with concurrent changes to the other sizes,
i.e. initialized/allocated/compressed size, as well.
- Implement mft.c::sync_mft_mirror_umount(). We currently will just
leave the volume dirty on umount if the final iput(vol->mft_ino)
causes a write of any mirrored mft records due to the mft mirror
inode having been discarded already. Whether this can actually ever
happen is unclear however so it is worth waiting until someone hits
the problem.
- Enable the code for setting the NT4 compatibility flag when we start
making NTFS 1.2 specific modifications.
2.1.24 - Lots of bug fixes and support more clean journal states.
- Support journals ($LogFile) which have been modified by chkdsk. This
means users can boot into Windows after we marked the volume dirty.
The Windows boot will run chkdsk and then reboot. The user can then
immediately boot into Linux rather than having to do a full Windows
boot first before rebooting into Linux and we will recognize such a
journal and empty it as it is clean by definition.
- Support journals ($LogFile) with only one restart page as well as
journals with two different restart pages. We sanity check both and
either use the only sane one or the more recent one of the two in the
case that both are valid.
- Add fs/ntfs/malloc.h::ntfs_malloc_nofs_nofail() which is analogous to
ntfs_malloc_nofs() but it performs allocations with __GFP_NOFAIL and
hence cannot fail.
- Use ntfs_malloc_nofs_nofail() in the two critical reg
