This patch converts reiserfs to use the new export_operations
interface for exporting a filesystem instead of the old
fh_to_dentry and dentry_to_fh.
Essentially it:

  - renamed reiserfs_dentry_to_fh to reiserfs_encode_fh
  - split reiserfs_fh_to_dentry into reiserfs_get_dentry
    and reiserfs_decode_fh
  - calls d_splice_alias from reiserfs_lookup so that building
    a dcache path from the bottom works well
  - addes reiserfs_get_parent to do a lookup of ".." without going
    through the VFS interfaces.
  - sets sb->s_export_op to be an appropriately initialised
    struct export_operations

This has been tested and works.

This patch converts ext3 to use the new export_operations for
exporting a filesystem.
In particular it
 - defines "ext3_get_parent" to do a lookup(".."),
 - calls d_splice_alias when ext3_lookup finds something,
   so that build a dcache path from the bottom up works, and
 - sets sb->s_export_op to point to an (almost empty)
   export_operations structure.  The fact that it is mostly empty
   means that the default lookup operations are used, which match the
   previous approach (i.e. use iget, and then check the generation
   number).

d_move wants the kernel to be locked, so
d_splice_alias now takes that lock.

Chris Wright <chris@wirex.com>  suggested these to limit to 80
columns and such.

1/ Return correct error code if nfs server creation fails
2/ Increase limit on number of nfsd threads

   There is no real justification for stopping a sysadmin
   from running lots and lots of nfsd threads, so we raise the
   imposed limit from 128 to 8192... maybe it should just go away...

The sunrpc/tcp layer currently allocates some resources linearly with
number of server threads.  This causes problems when there are very
small numbers of threads (e.g. lockd with one thread), so this patch
adds a small constant to the number of threads before calculating
resoures to allocate.

This patch also provide proper upper-limits for the response sizes for
lockd requests, so resources are not over-allocated.

Together these resolve problems with heavy lockd load over tcp.

 - remove page_cache_entry - I think it never ever was actually used.
 - remmove wake_up_page (as in 2.4) - never used
 - remove misleading comment ontop of pagemap.h
 - make wait_on_page* directly call wait_on_page_bit
 - some reordering and additional comments in pagemap.h

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

to {set_,clear_,}buffer_async_read).

 - Update HPT374 driver carried over from 2.4.xx series by Andrew Morton.
   Resync it with the recent host chip driver changes, or better the
   introduction of an API at all.

 - Consolidate the handling of device ID byte order in one place.
   This was spotted and patched by Bartomiej onierkiewicz.

 - Eliminate CONFIG_BLK_DEV_IDEPCI - it's duplicating the functionality of the
   already present and fine CONFIG_PCI flag and if we are a PCI host, we are
   indeed very likely to need host chip support anyway.

 - Remove some redundant info about the model and channel number from
   /proc/ide. Remove the binary entries not helpful to the user, and not used
   by any program and redundant to corresponding ioctls.

 - Properly return udma_read and udma_write values in taskfile.

 - Only initialize XXX_udma to the default handlers if it has not been
   initialized by the host chip initialization.

I have enabled spin lock debugging and can see that on device
flush the spin locks get wrong counts... no problems elsewher ethus
far. I will re check them next time around.

Transposed the last two arguments to memset, causing a slab poisoned
kernel not to use tagging correctly... Brown paper bag stuff.

Si_meminfo() is basically the same for all architectures (mips is a little
different by providing a value for the shared field that is different from
the originial intent, I will come back to this later), so it makes to have just
one instance of it:

 - appletalk adds unnessesary additional arguments to bool
 - net/wan has two comment statements on one line, separated by a + (!),
   also fixup indentation here.
 - sound uses a bool where it should use a dep_bool

This patch addresses Andrew's FIXME in buffer.c and adds a spinlock that
can be passed to the buffer list manipulation functions to the reiserfs
journal.  This obsoletes the cheks for lock beeing NULL in buffer.c and
the global_bufferlist_lock.

In addition osync_inode_list is changed to use list_for_each_prev as in 2.4
instead of a hand-crafted loop.

A little comment to the reiserfs folks:  your code would be _sooo_ much
easier to understand if you used temporary local variables for often
referenced fields..

	D'uh.  Linus, 2.5 also needs that one.

BTW, folks - whoever had submitted "fixes" replacing /dev/root.old with
/old/dev/root.old several lines above that one are welcome to think
about the reasons why their patches removed "failed" from boot log.

Pages under writeback are not locked.  So it is possible (and quite
legal) for a page to be under readpage() while it is still under
writeback.  For a partially uptodate page with blocksize <
PAGE_CACHE_SIZE.

When this happens, the read and write I/O completion handlers get
confused over the shared BH_Async usage and the page ends up not
getting PG_writeback cleared.  Truncate gets stuck in D state.

The patch separates the read and write I/O completion state.

It also shuffles the buffer fields around.  Putting the
commonly-accessed b_state at offset zero shrinks the kernel by a few
hundred bytes because it can be accessed with indirect addressing, not
indirect+indexed.

Set PG_launder against pages which are under VM writeback.  So page
allocators will throttle against them.

set_page_dirty() runs without the page lock.  So
__block_write_full_page() needs to be able to cope with the page's
buffers being dirtied concurrently, on another CPU.

Do this with careful ordering and a test-and-set.

Closes a small race window: testing PageWriteback() outside the page
lock introduces the possibility that page could be redirtied and have
writeback started after we've inspected PageWriteback.

When ext3 refiles journalled buffers for writeback, it is better to set the
page dirty as well as the buffer.  So the page will be written out by
VM pressure rather than by kjournald alone.

swapper_space is different.  Its pages are locked during writeout, it
uses PAGE_SIZE rather than PAGE_CACHE_SIZE.  Converting swap to look
more like the other address_spaces is a separate project.  This patch
fully restores the old swap behaviour.

- Don't dirty swapcache page buffers in set_page_dirty().

  Fixes a problem where __free_pte() runs set_page_dirty() and then
  immediately runs ClearPageDirty().  The pages ends up clean, with
  dirty buffers, and is unfreeable.

- Hence, don't mark the page clean if its buffers are clean - swap
  does not have page/buffers dirty state coherency.

The buffer state "uptodate, dirty, unmapped" is legal.  It occurs when
a mapped page with attached buffers which is over a hole is dirtied.

So discard_buffer() needs to be able to discard those buffers as well;
otherwise the page ends up clean, with dirty buffers and is unfreeable.

__delete_from_swap_cache modifies the radix tree.  We need to take the
lock for writing.

The recently-added page allocation failure warning generates a lot of
noise due to radix-tree node allocation failures.  Those messages are
not interesting.

But I think the warning is otherwise useful - "I got an allocation
failure and then it crashed" is better than "it crashed".

The patch suppresses the message for ratnode allocation failures.

 - Finish the changes from patch 53. ide_dma_actaion_t is gone now as well as
   whole hidden code paths associated with it. I hope I didn't mess too many
   things up with this, since the sheer size of the changes make them sensitive.
   (Tested on tree different host chip sets so it shouldn't be too bad...)

   Just still some minor cleanup remaining to be done in this area. The tags
   lefts there are intentional.

   In esp. the ide_dma_on method in cy82c693 looks suspicious.

   Using udma_enable in ide-cd.c, ide-floppy.c and ide-tape.c is suspicious as
   well. We have just uncovered it.

   In the next round we will concentrate on the fixes people did send me
   last time.

 - Start splitting the functions for host chip handling in to separate entities.
   This change is quite sensitive and may cause some trouble but it's for
   certain worth it anyway, because it should for example provide a much better
   infrastructure for th handling of different architectures.

Adapted from patch Bar³omiej ¯o³nierkiewicz:

 - make straight8 a flag in ata_channel instead of byte

 - don't store tables as code in drive_is_flashcard()
   and ide_xfer_verbose()

 - fix init_gendisk() (due to 2.5.13 blksize_size[] change)

 - compress region requesting/releasing
   in channel_probe() and ide_unregister()

 - clean a bit ide_setup_ports()

Start of DMA handling tratment.

 - Fix the parameters to ide_build_dmatable() to be channel and request.
   Rename it to udma_new_table(). udma will mark arch specific functions
   later.

 - Let ide_start_dma() take the request directly as an arguemnt. Rename it to
   ata_start_dma(). After realizing that the usage of the func argument of it
   was bogous and that nobody is using rwproc we where able to remove both of
   them.

 - Fix ide_destroy_dmatable() to take the channel as argument and rename it to
   udma_destroy_table(). This function should have possible architecture
   specific implementation as well at some point in time.

 - Split up the TCQ UDMA handling stuff in to proper functions. Jens must has
   been dreaming as he introduced them ;-).

into home.transmeta.com:/home/torvalds/v2.5/linux

- Remove always unused variable page from remap_pte_range().
- Fix printk in do_wp_page() so it doesn't print out an uninitialized
  variable (old_page). Add KERN_ERR log level while at it.

into home.transmeta.com:/home/torvalds/v2.5/linux

- Initialize the mftbmp address space properly now that there are more
fields in the struct address_space. This was leading to hangs and
oopses on umount since 2.5.12 because of changes to other parts of
the kernel. We probably want a kernel generic init_address_space()
function...
- Drop BKL from ntfs_readdir() after consultation with Al Viro. The
only caller of ->readdir() is vfs_readdir() which holds i_sem during
the call, and i_sem is sufficient protection against changes in the
directory inode (including ->i_size).
- Use generic_file_llseek() for directories (as opposed to
default_llseek()) as this downs i_sem instead of the BKL which is
what we now need for exclusion against ->f_pos changes considering we
no longer take the BKL in ntfs_readdir().

I found this bug in 2.5.10 first. And caused ext2 FS corruption.
We are porting Linux to PC-9801 architecture (made by NEC Japan).
It has PIO ONLY IDE I/F. So please check PIO mode too.

It was introduced in 2.5.9 and still exists in 2.5.13, and caused
superblock corruption for Andries.  This fixes it.

Andrej Lajovic observes that in kd.h the definitions of K_NUMLOCK and
K_CAPSLOCK are interchanged.  He is right (and this is the case since
1.1.54; nobody noticed because setleds.c does not use these defines).
So, here is the fix.  No kernel behaviour is changed.

xprt.c:
  Merge *_write_space() in order to fix compile warning and save space.

Cheers,
  Trond

xprt.c:
  Fix the RPC over TCP socket reconnect code.

Cheers,
  Trond

xprt.c:
  Speed up synchronous RPC over TCP calls by having the
  replies delivered by the IPV4 "bottom half", instead of
  switching to the rpciod process in order to call recvmsg().
   - Remove sock_recvmsg() interface.
   - Remove rpc_xprt_pending list and rpciod_tcp_dispatcher() interface.
   - Use the new tcp_read_sock() interface to deliver data directly
     from within tcp_data_ready().
sched.c:
   - Remove references to rpciod_tcp_dispatcher.
xprt.h:
   - New set of flags to reflect the TCP record read state.

Cheers,
  Trond

Fix silly truncate status update