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: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Use zero_user_page() instead of open-coding it.

[akpm@linux-foundation.org: kmap-type fixes]
Signed-off-by: Nate Diller <nate.diller@gmail.com>
Acked-by: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The KM_BIO_SRC_IRQ kmap slot requires local irq protection.
Acked-by: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Conversion of booleans to: generic-boolean.patch (2006-08-23)
Signed-off-by: Richard Knutsson <ricknu-0@student.ltu.se>
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Same as with already do with the file operations: keep them in .rodata and
prevents people from doing runtime patching.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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

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

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

      supported by NTFS which is 4096 bytes).

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

      preparation for the big rewrite of write(2) support in ntfs.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

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

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

*** Warning: "bit_spin_lock" [fs/ntfs/ntfs.ko] undefined!
*** Warning: "bit_spin_unlock" [fs/ntfs/ntfs.ko] undefined!

Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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

      fs/ntfs/aops.c::ntfs_end_buffer_async_read() to a bit spin lock
      in the first buffer head of a page.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

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

      fs/ntfs/aops.c::ntfs_readpage().
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      where a concurrent truncate has truncated the runlist under our feet.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      lock protection over the buffer submission for i/o which allows the
      removal of the get_bh()/put_bh() pairs for each buffer.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      fs/ntfs/aops.c::ntfs_writepage().
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

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

      for  mft record writing.  I had missed the writepage based mft record
      write code path.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      if the runlist was not mapped at all and a mapping error occured we
      would leave the runlist locked on exit to the function so that the
      next access to the same file would try to take the lock and deadlock.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      better code generation and one less sparse warning in fs/ntfs/aops.c.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

        and handle the case where an attribute is converted from resident
        to non-resident by a concurrent file write.
      - Reorder some operations when converting an attribute from resident
        to non-resident (fs/ntfs/attrib.c) so it is safe wrt concurrent
        ->readpage and ->writepage.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

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

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

      fs/ntfs/aops.c::ntfs_{prepare,commit}_write()() and re-enable it.
      It should be safe now.  (Famous last words...)
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      and abort if it fails again.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

      access to the i_size and other size fields using the size_lock.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!