path: root/fs/ntfs/ChangeLog

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-WIP

	- 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.
	- Modify fs/ntfs/malloc.h::ntfs_malloc_nofs() to do the kmalloc() based
	  allocations with __GFP_HIGHMEM, analogous to how the vmalloc() based
	  allocations are done.
	- 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 regions in
	  fs/ntfs/runlist.c::ntfs_runlists_merge().  This means we no longer
	  need to panic() if the allocation fails as it now cannot fail.

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,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.  Protect all
	  accesses to allocated_size, initialized_size, and compressed_size.
	- Minor optimization to fs/ntfs/super.c::ntfs_statfs() and its helpers.
	- 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
	  record after which we abort the write returning -EOPNOTSUPP from
	  ntfs_prepare_write().
	- Add disable_sparse mount option together with a per volume sparse
	  enable bit which is set appropriately and a per inode sparse disable
	  bit which is preset on some system file inodes as appropriate.
	- Enforce that sparse support is disabled on NTFS volumes pre 3.0.
	- Fix a bug in fs/ntfs/runlist.c::ntfs_m