FreeBSD/Linux Kernel Cross Reference
sys/fs/affs/Changes

     (Note: I consider version numbers as cheap. That means
     that I do not like numbers like 0.1 and the like for
     things that can be used since quite some time. But
     then, 3.1 doesn't mean 'perfectly stable', too.)
     
     Known bugs:
     -----------
     
     - Doesn't work on the alpha. The only 64/32-bit
      problem that I'm aware of (pointer/int conversion
      in readdir()) gives compiler warnings but is
      apparently not causing the failure, as directory
      reads basically work (but all files are of size 0).
      Alas, I've got no alpha to debug. :-(
    
    - The partition checker (drivers/block/genhd.c)
      doesn't work with devices which have 256 byte
      blocks (some very old SCSI drives). 
    
    - The feature to automatically make the fs clean
      might leave a trashed file system with the
      bitmap flag set valid.
    
    - When a file is truncated to a size that is not
      a multiple of the blocksize, the rest of the
      last allocated block is not cleared. Well,
      this fs never claimed to be Posix conformant.
    
    Please direct bug reports to: zippel@linux-m68k.org
    
    Version 3.19
    ------------
    
    - sizeof changes from Kernel Janitor Project
    - several bug fixes found with fsx
    
    Version 3.18
    ------------
    
    - change to global min macro + warning fixes
    - add module tags
    
    Version 3.17
    ------------
    
    - locking fixes
    - wrong sign in __affs_hash_dentry
    - remove unnecessary check in affs_new_inode
    - enable international mode for dircache fs
    
    Version 3.16
    ------------
    
    - use mark_buffer_dirty_inode instead of mark_buffer_dirty.
    - introduce affs_lock_{link|dir|ext}.
    
    Version 3.15
    ------------
    
    - disable link to directories until we can properly support them.
    - locking fixes for link creation/removal.
    
    Version 3.14
    ------------
    
    - correctly cut off long file names for compares
    - correctly initialize s_last_bmap
    
    Version 3.13
    ------------
    
    Major cleanup for 2.4 [Roman Zippel]
    - new extended block handling
    - new bitmap allocation functions
    - locking should be safe for the future
    - cleanup of some interfaces
    
    Version 3.12
    ------------
    
    more 2.4 fixes: [Roman Zippel]
    - s_lock changes
    - increased getblock mess
    - clear meta blocks 
    
    Version 3.11
    ------------
    
    - Converted to use 2.3.x page cache [Dave Jones <dave@powertweak.com>]
    - Corruption in truncate() bugfix [Ken Tyler <kent@werple.net.au>]
    
    Version 3.10
    ------------
    
    - Changed partition checker to allow devices
      with physical blocks != 512 bytes.
    
    - The partition checker now also ignores the
      word at 0xd0 that Windows likes to write to.
   
   Version 3.9
   -----------
   
   - Moved cleanup from release_file() to put_inode().
     This makes the first one obsolete.
   
   - truncate() zeroes the unused remainder of a
     partially used last block when a file is truncated.
     It also marks the inode dirty now (which is not
     really necessary as notify_change() will do
     it anyway).
   
   - Added a few comments, fixed some typos (and
     introduced some new ones), made the debug messages
     more consistent. Changed a bad example in the
     doc file (affs.txt).
   
   - Sets the NOEXEC flag in read_super() for old file
     systems, since you can't run programs on them.
   
   Version 3.8
   -----------
   Bill Hawes kindly reviewed the affs and sent me the
   patches he did. They're marked (BH). Thanks, Bill!
   
   - Cleanup of error handling in read_super().
     Didn't release all resources in case of an
     error. (BH)
   
   - put_inode() releases the ext cache only if it's
     no longer needed. (BH)
   
   - One set of dentry callbacks is enough. (BH)
   
   - Cleanup of error handling in namei.c. (BH)
   
   - Cleanup of error handling in file.c. (BH)
   
   - The original blocksize of the device is
     restored when the fs is unmounted. (BH)
   
   - getblock() did not invalidate the key cache
     when it allocated a new block.
   
   - Removed some unnecessary locks as Bill
     suggested.
   
   - Simplified match_name(), changed all hashing
     and case insensitive name comparisons to use
     uppercase. This makes the tolower() routines
     obsolete.
   
   - Added mount option 'mufs' to force muFS
     uid/gid interpretation.
   
   - File mode changes were not updated on disk.
     This was fixed before, but somehow got lost.
   
   Version 3.7
   -----------
   
   - Added dentry callbacks to allow the dcache to
     operate case insensitive and length ignorant
     like the affs itself.
   
   - getblock() didn't update the lastblock field in the
     inode if the fs was not an OFS. This bug only shows
     up if a file was enlarged via truncate() and there
     was not enough space.
   
   - Remove some more superfluous code left over from
     the old link days ...
   
   - Fixed some oversights which were in patch 2.1.78.
   
   - Fixed a few typos.
   
   Version 3.6
   -----------
   
   - dentry changes. (Thanks to Jes Sorensen for his help.)
   
   - Fixed bug in balloc(): Superblock was not set dirty after
     the bitmap was changed, so the bitmap wasn't sync'd.
   
   - Fixed nasty bug in find_new_zone(): If the current
     zone number was zero, the loop didn't terminate,
     causing a solid lock-up.
   
   - Removed support for old-style directory reads.
   
   - Fixed bug in add_entry(): When doing a sorted insert,
     the pointer to the next entry in the hash chain wasn't
     correctly byte-swapped. Since most of the users of the
     affs use it on a 68k, they didn't notice. But why did
     I not find this during my tests?
   
   - Fixed some oversights (version wasn't updated on some
     directory changes).
   
   - Handling of hard links rewritten. To the VFS
     they appear now as normal Unix links. They are
     now resolved only once in lookup(). The backside
     is that unlink(), rename() and rmdir() have to
     be smart about them, but the result is worth the
     effort. This also led to some code cleanup.
   
   - Changed name type to unsigned char; the test for
     invalid filenames didn't work correctly.
     (Thanks to Michael Krause for pointing at this.)
   
   - Changed mapping of executable flag.
   
   - Changed all network byte-order macros to the
     recommended ones.
   
   - Added a remount function, so attempts to remount
     a dircache filesystem or one with errors read/write
     can be trapped. Previously, ro remounts didn't
     flush the super block, and rw remounts didn't
     create allocation zones ...
   
   - Call shrink_dcache_parent() in rmdir().
     (Thanks to Bill Hawes.)
   
   - Permission checks in unlink().
   
   - Allow mounting of volumes with superfluous
     bitmap pointers read only, also allows them
     to be remounted read/write.
   
   - Owner/Group defaults now to the fs user (i.e.
     the one that mounted it) instead of root. This
     obsoletes the mount options uid and gid.
   
   - Argument to volume option could overflow the
     name buffer. It is now silently truncated to
     30 characters. (Damn it! This kind of bug
     is too embarrassing.)
   
   - Split inode.c into 2 files, the superblock
     routines desperately wanted their own file.
   
   - truncate() didn't allocate an extension block
     cache. If a file was extended by means of
     truncate(), this led to an Oops.
   
   - fsuser is now checked last.
   
   - rename() will not ignore changes in filename
     casing any more (though mv(1) still won't allow
     you to do "mv oldname OldName").
   
   Version 3.5
   -----------
   
   - Extension block caches are now allocated on
     demand instead of when a file is opened, as
     files can be read and written without opening
     them (e. g. the loopback device does this).
   
   - Removed an unused function.
   
   Version 3.4
   -----------
   
   - Hash chains are now sorted by block numbers.
     (Thanks to Kars de Jong for finding this.)
   - Removed all unnecessary external symbols.
   
   Version 3.3
   -----------
   
   - Tried to make all types 'correct' and consistent.
   - Errors and warnings are now reported via a
     function. They are all prefixed by a severity
     and have the same appearance:
       "AFFS: <function>: <error message>"
     (There's one exception to this, as in that function
     is no pointer to the super block available.)
   - The filesystem is remounted read-only after an
     error.
   - The names of newly created filesystem objects are
     now checked for validity.
   - Minor cleanups in comments.
   - Added this Changes file. At last!
   
   Version 3.2
   -----------
   
   - Extension block cache: Reading/writing of huge files
     (several MB) is much faster (of course the added
     overhead slows down opening, but this is hardly
     noticeable).
   - The same get_block()-routine can now be used for
     both OFS and FFS.
   - The super block is now searched in the block that
     was calculated and in the one following. This
     should remedy the round-off error introduced by
     the 1-k blocks that Linux uses.
   - Minor changes to adhere to the new VFS interface.
   - The number of used blocks is now also calculated
     if the filesystem is mounted read-only.
   - Prefixed some constants with AFFS_ to avoid name
     clashes.
   - Removed 'EXPERIMENTAL' status.
   
   Version 3.1
   -----------
   
   - Fixed a nasty bug which didn't allow read-only
     mounts.
   - Allow dir-cache filesystems to be mounted
     read only.
   - OFS support.
   - Several other changes I just cannot remember
     any more.
   
   Version 3.0
   -----------
   
   - Almost complete rewrite for the new VFS
     interface in Linux 1.3.
   - Write support.
   - Support for hard and symbolic links.
   - Lots of things I remember even less ...
   
   Version 2.0
   -----------
   
   - Fixed a few things to get it compiled.
   - Automatic root block calculation.
   - Partition checker for genhd.c
   
   ========================================
   
   Let's just call Ray Burr's original affs
   'Version 1.0'.

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