A disconnected dentry can hold an inode active after the last link has
been removed.  The file will not then be truncated and removed until
memory pressure flushes the disconnected dentry from the dcache.

This problem can be resolved by making sure that an inode never has
both a connected and a disconnected dentry.

This is already the case for directories (as they must only have one
dentry), but it is not the case for non-directories.

This addresses it by:
 - changes d_alloc_anon to make sure that a new disconnected dentry is
   only allocated if there is currently no (hashed) dentry for the
   inode. (Previously this would noramlly be true, but a race was
   possible).
 - changes d_splice_alias to re-use a disconnected dentry on
   non-directories as well as directories.
 - splits most of d_find_alias out into a separate function to make
   the above easier.

Problem originally reported by Nikita Danilov.

Acked by Al Viro ("It looks sane"), and Jakob Oestergaard reports this
fixes his problems. Further pushed by Christoph Hellwig.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

People don't build UP very often it seems ... anyways, it was broken,
here is the fix.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The current code allocating the DART has a couple of bugs, first
it's called on all machines including the ones who have no DART
(oops), and then it tries to access the device-tree using the
"of_chosen" pointer before it was initialized.

The enclosed patch fixes these.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Looks like we never needed them, since that bug has been there forever,
I didn't get the right base for the IO cycles on the G5 host bridge
in the first place (I probably misinterpreted some OF forth code or
something like that).

No problems reported other than Linus typo in an unbuildable driver from
the last one.

This one adds tty_ldisc_flush and also makes tty_wakeup do the queue
wake as discussed with Paul.  I've then propagated these functions
through all the drivers.  This means most drivers don't know about the
ldisc locking and instead call generic functions that look after it. 
The result is the removal of a lot of duplicate code both for ldisc
referencing and historical code for handling tty ldisc wakeup semantics.

A nice side effect is that by adding versions of the two helpers we can
switch most of the drivers over before changing the core tty code if
preferred.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Silly thinko/typo, it needs to check the newly allocated memory for
failure of course. Noticed by Stefan Meyknecht.
Signed-off-by: Jens Axboe <axboe@suse.de>
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

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

into flatcap.org:/home/flatcap/backup/bk/ntfs-2.6

into cantab.net:/home/src/ntfs-2.6

into flatcap.org:/home/flatcap/backup/bk/ntfs-2.6

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

into flatcap.org:/home/flatcap/backup/bk/ntfs-2.6

      typed enums.  This completes the sparse annotations in NTFS.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

They are just a nuissance.
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch moves the following files in /proc:
	/proc/net/rt_cache_stat 	/proc/net/stat/rt_cache
	/proc/net/ip_conntrack_stat	/proc/net/stat/ip_conntrack
	/proc/net/arp_cache_stat	/proc/net/stat/arp_cache
	/proc/net/clip_arp_cache_stat	/proc/net/stat/clip_arp_cache
	/proc/net/dn_neigh_cache_stat	/proc/net/stat/dn_neigh_cache

This allows a generic statistics tool to scan for all available statistics
by doing readdir(2) on /proc/net/stat

It also adds a special first 'template' line to rt_cache and ip_conntrack
in order to facilitate compatibility once somebody adds new fields to the
output lines.

WARNING: 
	This breaks existing rtstat.c and ctstat.c userspace programs
	(hopefully for the last time).  rtstat is non-existant or broken in
	major distributions anyway, and ctstat is too new for any distros
	having it picked up.  Therefore, we justify this breakage.

A new unified statistics tool for routing cache, connection tracking and
neighbour cache is under development and will be included with iproute2.
Signed-off-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

Signed-off-by: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>

We need to rewind skb pointers when we forward a packet to other host
because dst_input() assumes that skb->data points head of ipv6 protocol header.
Signed-off-by: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>

Signed-off-by: Adnaldo Carvalho de Melo <acme@conectiva.com.br>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Aaron Grothe <ajgrothe@yahoo.com>
Signed-off-by: James Morris <jmorris@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Report parent classid of a qdisc back to userspace. Without this there
is no way for userspace to see if the qdisc is attached to a class
other than parsing all class trees of the link and check all tcm_info
fields in the leaf classes.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Based upon a bug fix patch and suggestions from
Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

Also fix the return value of tcp_sync_mss() to
be unsigned.
Signed-off-by: David S. Miller <davem@davemloft.net>

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

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

There's an issue with bio_uncopy_user() in that it expects ->bv_len to
be untouched from io submission to io completion, which it wont be for
some transfer lengths on some hardware. So we end up not copying all the
data back to user space, not so good. This patch adds a bio_map_data
local structure to track the io_vec.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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

fixes two deadlocks when near-full and fixes a 4KSTACKS problem in XFS.

SGI Modid: xfs-linux:xfs-kern:19600a
Signed-off-by: Nathan Scott <nathans@sgi.com>

Signed-off-by: Nathan Scott <nathans@sgi.com>