A problem with htree was recently discovered during Lustre testing when
files were being renamed within the same directory.  In some cases the
addition of the new name caused a directory block split and the old
dir_entry was pointing at the wrong entry, and the wrong entry was removed.
This would seem entirely possible in a Maildir directory, since the MTA
will be doing a lot of renames within the same directory.

If old_de is pointing to the newly-added entry (i_ino is the same) we end up
deleting the new entry instead of the old one.  It looks as if the rename
never happened.  We need to verify that the name we are unlinking is what we
expect.

If is also possible that old_de is pointing to the now-unused space at the end
of a newly-split leaf block, so we still need to try ext3_delete_entry()
(which will skip the stale entry and return ENOENT) instead of just relying on
the inum + name check.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

I've seen no warnings, nor heard any reports of warnings, that anon_vma ever
misses ptes (nor anonmm before it).  That WARN_ON (with its useless stack
dump) was okay to goad developers into making reports, but would mainly be an
irritation if it ever appears on user systems: kill it now.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Andrea Arcangeli's fix to an ironic weakness with get_user_pages. 

try_to_unmap_one must check page_count against page->mapcount before unmapping
a swapcache page: because the raised pagecount by which get_user_pages ensures
the page cannot be freed, will cause any write fault to see that page as not
exclusively owned, and therefore a copy page will be substituted for it - the
reverse of what's intended.

rmap.c was entirely free of such page_count heuristics before, I tried hard to
avoid putting this in.  But Andrea's fix rarely gives a false positive; and
although it might be nicer to change exclusive_swap_page etc.  to rely on
page->mapcount instead, it seems likely that we'll want to get rid of
page->mapcount later, so better not to entrench its use.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

For those arches (arm and parisc) which use the i_mmap tree to implement
flush_dcache_page, during split_vma there's a small window in vma_adjust when
flush_dcache_mmap_lock is dropped, and pages in the split-off part of the vma
might for an instant be invisible to __flush_dcache_page.

Though we're more solid there than ever before, I guess it's a bad idea to
leave that window: so (with regret, it was structurally nicer before) take
__vma_link_file (and vma_prio_tree_init) out of __vma_link.

vma_prio_tree_init (which NULLs a few fields) is actually only needed when
copying a vma, not when a new one has just been memset to 0.

__insert_vm_struct is used by nothing but vma_adjust's split_vma case:
comment it accordingly, remove its mark_mm_hugetlb (it can never create
a new kind of vma) and its validate_mm (another follows immediately).
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Fix vma_adjust adjust_next wrapping: Rajesh V.  pointed out that if end were
2GB or more beyond next->vm_start (on 32-bit), then next->vm_pgoff would have
been negatively adjusted.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Rajesh Venkatasubramanian <vrajesh@umich.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The follow_page write-access case is relying on pte_page before checking
pfn_valid: rearrange that - and we don't need three struct page *pages.

(I notice mempolicy.c's verify_pages is also relying on pte_page, but I'll
leave that to Andi: maybe it ought to be failing on, or skipping over, VM_IO
or VM_RESERVED vmas?)
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Initialize swapper_space.i_mmap_nonlinear, so mapping_mapped reports false on
it (as it used to do).  Update comment on swapper_space, now more fields are
used than those initialized explicitly.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch fixes the problem some people had with their systems crashing
early at boot.  Also fix a problem in the LDT/TSS setup noticed by Paul
Menage.  And some other random fixes.

- Update defconfig
- Remove some unnecessary printks
- Enlarge kernel mapping to 40MB
- Fix acpi=ht (Suresh Siddha)
- Use KERN_ALERT for more important oops lines
- Fix LDT/TSS limit (Paul Menage)
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Brown-paper bag time... I put a typo in the asm for _raw_write_trylock
(left in a spurious \n\).  This patch fixes it.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

into ppc970.osdl.org:/home/torvalds/v2.6/linux

into ppc970.osdl.org:/home/torvalds/v2.6/linux

Patch from Toshihiro Kobayashi

do_translation_fault() in arch/arm/mm/fault.c will never resolve odd PMD.
This patch fixes that problem.

Patch from Catalin Marinas

arch/arm/mm/mmap.c: arch_get_unamapped_area() checks bit 9 in the cache type register for possible cache aliasing problems. Bit 11 should be checked instead.

into ppc970.osdl.org:/home/torvalds/v2.6/linux

ioctl structure annotated

	The rest of ->ifr_data cleanups.  A bunch of drivers use address
of ifr->ifr_ifru, but spell that as &ifr->ifr_data, which expands to
&ifr->ifr_ifru.ifru_data.  ifr_ifru is a union and in effect they sneak in
a private field into that union; ifr_ifru.ifru_data is a field in that
union and it has nothing to do with the things they want to do.  Cleaned
up by explicit use of &ifr->ifr_ifru.

	Several places where we really use ->ifr_data (i.e. use its value
and use it as __user pointer) annotated.

From: Jeff Garzik

	Jeff's patch adds a helper for obtaining mii_ioctl_data from ifreq
and switches drivers to it.  It's almost a "move common expression into
inline helper", except that instead of

	(struct mii_ioctl_data *)&rq->ifr_ifru.ifru_data

it does

	(struct mii_ioctl_data *)&rq->ifr_ifru

- pointer to union instead of pointer to a field of union that has nothing
to do with mii_ioctl_data *and* adds confusion by being a pointer itself.

into nuts.davemloft.net:/disk1/BK/net-2.6

Here's an additional patch for ipvs, which also mangles packets via 
netfilter and was previously depending on the checksum helper in 
nf_hook_slow().
Signed-of-by: James Morris <jmorris@redhat.com>
Signed-of-by: David S. Miller <davem@redhat.com>

into nuts.davemloft.net:/disk1/BK/net-2.6

Some boards don't support C1 Halt Disconnect.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

assorted minor bits in drivers/* - all independent, but there's
some limit to splitting stuff...

several pointers in ioctl structures marked as userland ones.

And that's it with this patchset.  A couple more of those and we'll
be done with the noise warnings ;-)

s2io.c: bogus initializer ({{"a"},{"b"}} has too many braces for
two-dimensional array of char - strings are arrays themselves).

de4x5.h: missing __user on a pointer in ioctl structure. 

airo.c: cleaned up and fixed procfs ->read() and ->write()

osst.c, st.c, scsi_debug.c annotated.