Big thanks go to Mathias Kolehmainen for reporting the bug, providing
debug output and testing the patches I sent him to get it working.

The fix was to stop calling ntfs_attr_set() at mount time as that causes
balance_dirty_pages_ratelimited() to be called which on systems with
little memory actually tries to go and balance the dirty pages which tries
to take the s_umount semaphore but because we are still in fill_super()
across which the VFS holds s_umount for writing this results in a
deadlock.

We now do the dirty work by hand by submitting individual buffers.  This
has the annoying "feature" that mounting can take a few seconds if the
journal is large as we have clear it all.  One day someone should improve
on this by deferring the journal clearing to a helper kernel thread so it
can be done in the background but I don't have time for this at the moment
and the current solution works fine so I am leaving it like this for now.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

- Fix deadlock in fs/ntfs/inode.c::ntfs_put_inode().  Thanks to Sergey
  Vlasov for the report and detailed analysis of the deadlock.  The fix
  involved getting rid of ntfs_put_inode() altogether and hence NTFS no
  longer has a ->put_inode super operation.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

The conversion was generated via scripts, and the result was validated
automatically via a script as well.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      fs/ntfs/unistr.c::ntfs_nlstoucs() in fs/ntfs/namei.c::ntfs_lookup().
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      fs/ntfs/inode.c::ntfs_write_inode().
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      forgot to update a temporary variable so loading index inodes which
      have an index allocation attribute failed.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      allowed by NTFS, i.e. 255 Unicode characters, not including the
      terminating NULL (which is not stored on disk).
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      from read inode and new inode code paths.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      unused, invalid mft records which are the same in both $MFT and
      $MFTMirr.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

       address space operations.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      continued the attribute lookup loop instead of aborting it.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

     special casing the VOLUME_MODIFIED_BY_CHKDSK flag.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      supported by NTFS which is 4096 bytes).

	Windows copes with this and even chkdsk does not detect or fix this
	so we have to cope with it, too.  Thanks to Pawel Kot for reporting
	the problem.
      - Miscellaneous updates to layout.h.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

This patch removes all references to the bouncing address
rddunlap@osdl.org and one dead web page from the kernel.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Acked-by: NRandy Dunlap <rdunlap@xenotime.net>

      patch by Yura Pakhuchiy.)
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      Minor tidying.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      file operations ->write(), ->aio_write(), and ->writev() for regular
      files.  This replaces the old use of generic_file_write(), et al and
      the address space operations ->prepare_write and ->commit_write.
      This means that both sparse and non-sparse (unencrypted and
      uncompressed) files can now be extended using the normal write(2)
      code path.  There are two limitations at present and these are that
      we never create sparse files and that we only have limited support
      for highly fragmented files, i.e. ones whose data attribute is split
      across multiple extents.   When such a case is encountered,
      EOPNOTSUPP is returned.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      and cond_resched() in the main loop as we could be dirtying a lot of
      pages and this ensures we play nice with the VM and the system as a
      whole.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      the initial implementation of file truncation.  Now both open(2)ing
      a file with the O_TRUNC flag and the {,f}truncate(2) system calls
      will resize a file appropriately.  The limitations are that only
      uncompressed and unencrypted files are supported.  Also, there is
      only very limited support for highly fragmented files (the ones whose
      $DATA attribute is split into multiple attribute extents).
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      uncompressed and unencrypted files.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      extend the allocation of an attributes.  Optionally, the data size,
      but not the initialized size can be extended, too.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      which is zero for a resident attribute but should no longer be zero
      once the attribute is non-resident as it then has real clusters
      allocated.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      as an extra parameter.  This is needed since we need to know the size
      before we can map the mft record and our callers always know it.  The
      reason we cannot simply read the size from the vfs inode i_size is
      that this is not necessarily uptodate.  This happens when
      ntfs_attr_make_non_resident() is called in the ->truncate call path.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

        specifying whether the cluster are being allocated to extend an
        attribute or to fill a hole.
      - Change ntfs_attr_make_non_resident() to call ntfs_cluster_alloc()
        with @is_extension set to TRUE and remove the runlist terminator
        fixup code as this is now done by ntfs_cluster_alloc().
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

        search context as argument.  This allows calling it with the mft
        record mapped.  Update all callers.
      - Fix potential deadlock in ntfs_mft_data_extend_allocation_nolock()
	error handling by passing in the active search context when calling
	ntfs_cluster_free().
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      search context as argument.  This allows calling it with the mft
      record mapped.  Update all callers.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      search context.  This allows calling it with the mft record mapped.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      count to become negative and hence we had a wild memset() scribbling
      all over the system's ram.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      restart pages in the journal without multi sector transfer protection
      fixups (i.e. the update sequence array is empty and in fact does not
      exist).
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      since we otherwise get into a lock reversal deadlock if a read locked
      runlist is passed in. In the process also change it to take an ntfs
      inode instead of a vfs inode as parameter.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      changes by Richard Russon.)
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      otherwise causes a BUG().
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>

      an octal number to conform to how chmod(1) works, too.  Thanks to
      Giuseppe Bilotta and Horst von Brand for pointing out the errors of
      my ways.
Signed-off-by: NAnton Altaparmakov <aia21@cantab.net>