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.

2.1.23 - 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_mapping_pairs_decompress() in
	  the creation of the unmapped runlist element for the base attribute
	  extent.
	- Split ntfs_map_runlist() into ntfs_map_runlist() and a non-locking
	  helper ntfs_map_runlist_nolock() which is used by ntfs_map_runlist().
	  This allows us to map runlist fragments with the runlist lock already
	  held without having to drop and reacquire it around the call.  Adapt
	  all callers.
	- Change ntfs_find_vcn() to ntfs_find_vcn_nolock() which takes a locked
	  runlist.  This allows us to find runlist elements with the runlist
	  lock already held without having to drop and reacquire it around the
	  call.  Adapt all callers.
	- Change time to u64 in time.h::ntfs2utc() as it otherwise generates a
	  warning in the do_div() call on sparc32.  Thanks to Meelis Roos for
	  the report and analysis of the warning.
	- Fix a nasty runlist merge bug when merging two holes.
	- Set the ntfs_inode->allocated_size to the real allocated size in the
	  mft record for resident attributes (fs/ntfs/inode.c).
	- Small readability cleanup to use "a" instead of "ctx->attr"
	  everywhere (fs/ntfs/inode.c).
	- Make fs/ntfs/namei.c::ntfs_get_{parent,dentry} static and move the
	  definition of ntfs_export_ops from fs/ntfs/super.c to namei.c.  Also,
	  declare ntfs_export_ops in fs/ntfs/ntfs.h.
	- Correct sparse file handling.  The compressed values need to be
	  checked and set in the ntfs inode as done for compressed files and
	  the compressed size needs to be used for vfs inode->i_blocks instead
	  of the allocated size, again, as done for compressed files.
	- Add AT_EA in addition to AT_DATA to whitelist for being allowed to be
	  non-resident in fs/ntfs/attrib.c::ntfs_attr_can_be_non_resident().
	- Add fs/ntfs/attrib.c::ntfs_attr_vcn_to_lcn_nolock() used by the new
	  write code.
	- Fix bug in fs/ntfs/attrib.c::ntfs_find_vcn_nolock() where after
	  dropping the read lock and taking the write lock we were not checking
	  whether someone else did not a