Yet another one in the namespace.c series.

The code in graft_tree() used to be correct, but the code

        err = -ENOENT;
        down(&nd->dentry->d_inode->i_sem);
        if (IS_DEADDIR(nd->dentry->d_inode))
                goto out_unlock;

        spin_lock(&dcache_lock);
        if (IS_ROOT(nd->dentry) || !d_unhashed(nd->dentry)) {
		...
	}
	spin_unlock(&dcache_lock);
 out_unlock:

was made incorrect in 2.5.29 when

        err = security_sb_check_sb(mnt, nd);
        if (err)
                goto out_unlock;

was inserted.  It has happened more often that people overlooked
a preexisting setting of err.

Tell the arch that install_page() has just added a page into the pagetables.

From: William Lee Irwin III <wli@holomorphy.com>

Silence a printk warning.

From: William Lee Irwin III <wli@holomorphy.com>

64-bit ACPI fixes

From: William Lee Irwin III <wli@holomorphy.com>

Fix "cast to pointer from integer of a different size".

From: Martin Hicks <mort@wildopensource.com>

Here is a patch that changes mmu_gathers into a per-cpu resource.  It
includes the changes for all arches except ia64.  I've sent a separate patch
to David Mosberger for ia64.

From: Hollis Blanchard <hollis@austin.ibm.com>

Fix two pnp error-path memory leaks, caught by Stanford memory leak checker
circa 2.5.48.

From: Hollis Blanchard <hollis@austin.ibm.com>

Another potential memory leak the Stanford checker caught at 2.5.48: while
closing and opening floppy disks, buf could be allocated and never freed.

From: Hollis Blanchard <hollis@austin.ibm.com>

Hi, this was caught by the Stanford memory leak checker a while ago
(2.5.48). If the tmp_stats allocation fails, tmp is not being freed.

From: john stultz <johnstul@us.ibm.com>

This is a rework of John's recent change which resolved a circular include
dependency: a function in mach_apic.h requires hard_smp_processor_id() and
hard_smp_processor_id() requires macros from mach_apic.h

So this patch (against bk-current) reverts the previous, and fixes the same
circular dependency in a much cleaner way, by moving a piece of the circular
chain into its own .h file, rather then removing hard_smp_processor_id() and
accessing the apic by hand.

From: Maneesh Soni <maneesh@in.ibm.com>

Provides a separate request queue for each ramdisk instance.  Without this,
the kernel oopses when the block later tries to unregister the same set of
kobject things multiple times.  This makes rd.c consistent with all other
"disk" devices.

From: Duncan Haldane <f.duncan.m.haldane@worldnet.att.net>

Gerd Knorr noticed a small use of floating point math in the cpia driver
updates for 2.5.x I sent you a while ago, and this is not allowed in the
kernel.

This was in some code taken essentially verbatim from the Windows cpia
driver released under the GPL by STM inc.  that had been incorporated in
the later versions of the cpia drivera sourceforge.

It turns out that the use of floating point was quite inessential, and I've
reimplemented the couple of lines of code involved in integer arithmetic.

From: Rick Lindsley <ricklind@us.ibm.com>

Here is a file to add to the Documentation/ directory which describes the
disk statistics fields.

- Add an explanation for clearing the focus bit on P4 (zwane)

- __d_path kerneldoc fix (John Levon)

- generic-hdlc documentation fix (Krzysztof Halasa <khc@pm.waw.pl>)

- cmdline_read_proc cleanup (Oleg Drokin)

- remove a couple of unused vars from drivers/ide/pci/hpt366.c

- sound/core/sgbuf.c needs mm.h at least on alpha, for mem_map and other
  page stuff.  (Ivan Kokshaysky <ink@jurassic.park.msu.ru>)

- Don't use "u32 long" in cs46xx.c (Kevin Puetz <puetzk@puetzk.org>)

- fs/nfs/nfs4xdr.c warning fix: all the `goto out;' statements are
  commented away, so comment away the label too.

- net/ipv6/af_inet6.c: remove unused var

- drivers/media/video/bttv-cards.c: jiffies are unsigned long

- drivers/media/video/saa7134/saa7134-cards.c: unused var

- Fix Documentation/Changes comment wrt sparc compiler version

- drivers/pnp/quirks.c needs slab.h for kfree().  (Daniele Bellucci
  <bellucda@tiscali.it>)

From: David Gibson <david@gibson.dropbear.id.au>


Renames check_valid_hugepage_range() to is_hugepage_only_range(), which makes
more sense.

From: Manfred Spraul <manfred@colorfullife.com>

de_thread is called by exec to kill all threads in the thread group except
the threads required for exec.

The waiting is implemented by waiting for a wakeup from __exit_signal: If
the reference count is less or equal to 2, then the waiter is woken up.  If
exec is called by a non-leader thread, then two threads are required for
exec.

But if a thread group leader calls exec, then only one thread is required
for exec.  Thus the hardcoded "2" leads to a superfluous wakeup.  The patch
fixes that by adding a "notify_count" field to the signal structure.

From: Frank Cusack <fcusack@fcusack.com>

net/sunrpc/sunrpc_syms.c typo fix

From: Dave Hansen <haveblue@us.ibm.com>

This patch makes vm_enough_memory(), more likely return failure when
overcommit_memory==0 and !CAP_SYS_ADMIN.  I'm not sure it's worth having
another tunable just for this.

I also reworked the documentation a bit.  It should be a lot clearer to
read now.

From: Stephen Smalley <sds@epoch.ncsc.mil>

This patch against 2.5.69-bk adds an xattr handler for security labels
to devpts and corresponding hooks to the LSM API to support conversion
between xattr values and the security labels stored in the inode
security field by the security module.

This allows userspace to get and set the security labels on devpts
nodes, e.g.  so that sshd can set the security label for the pty using
setxattr, just as sshd already sets the ownership using chown.

SELinux uses this support to protect the pty in accordance with the user
process' security label.  The changes to the LSM API are general and
should be re-useable by xattr handlers in other pseudo filesystems to
support similar security labeling.  The xattr handler for devpts
includes the same generic framework as in ext[23], so handlers for other
kinds of attributes can be added easily in the future.

From: Christopher Hoover <ch@murgatroid.com>

Here's a patch to drop some more text/data/bss out of 2.5.  This time
the ``victim'' is eventpollfs (epoll).

From: Christopher Hoover <ch@murgatroid.com>

Not everyone needs futex support, so it should be optional.  This is needed
for small platforms.

From: Stephen Smalley <sds@epoch.ncsc.mil>

This patch against 2.5.69-bk adds a hook to proc_pid_make_inode to allow
security modules to set the security attributes on /proc/pid inodes based on
the security attributes of the associated task.  This is required by SELinux
in order to control access to the process state accessible via /proc/pid
inodes in accordance with the task's security label.

An alternative approach that was considered was to implement an xattr handler
for /proc/pid inodes.  That approach would still require a hook call from the
xattr handler to the security module to obtain an xattr value based on the
task security attributes, so it would add a further level of
indirection/translation.  The only benefit of implementing an xattr handler
for the /proc/pid inodes would be that the /proc/pid inode security labels
could then be exported to userspace.  However, the /proc/pid inode security
labels are only used internally by the security module for access control
purposes, and userspace access to the full range of process attributes is
already provided via the /proc/pid/attr interface.  Consequently, a simple
hook in proc_pid_make_inode seemed preferable.

From: Stephen Smalley <sds@epoch.ncsc.mil>

This patch, relative to the /proc/pid/attr patch against 2.5.69, fixes the
mode values of the /proc/pid/attr nodes to avoid interference by the normal
Linux access checks for these nodes (and also fixes the /proc/pid/attr/prev
mode to reflect its read-only nature).

Otherwise, when the dumpable flag is cleared by a set[ug]id or unreadable
executable, a process will lose the ability to set its own attributes via
writes to /proc/pid/attr due to a DAC failure (/proc/pid inodes are
assigned the root uid/gid if the task is not dumpable, and the original
mode only permitted the owner to write).

The security module should implement appropriate permission checking in its
[gs]etprocattr hook functions.  In the case of SELinux, the setprocattr
hook function only allows a process to write to its own /proc/pid/attr
nodes as well as imposing other policy-based restrictions, and the
getprocattr hook function performs a permission check between the security
labels of the current process and target process to determine whether the
operation is permitted.

From: Stephen Smalley <sds@epoch.ncsc.mil>

This updated patch against 2.5.69 merges the readdir and lookup routines
for proc_base and proc_attr, fixes the copy_to_user call in proc_attr_read
and proc_info_read, moves the new data and code within CONFIG_SECURITY, and
uses ARRAY_SIZE, per the comments from Al Viro and Andrew Morton.  As
before, this patch implements a process attribute API for security modules
via a set of nodes in a /proc/pid/attr directory.  Credit for the idea of
implementing this API via /proc/pid/attr nodes goes to Al Viro.  Jan Harkes
provided a nice cleanup of the implementation to reduce the code bloat.

All slabs which can be reclaimed via VM presure are marked as being
shrinkable, so the core slab code will keep count of their pages.

Except for the one in XFS.  It has strange wrapper stuff.

We have a problem at present in vm_enough_memory(): it uses smoke-n-mirrors
to try to work out how much memory can be reclaimed from dcache and icache.
it sometimes gets it quite wrong, especially if the slab has internal
fragmentation.  And it often does.

So here we take a new approach.  Rather than trying to work out how many
pages are reclaimable by counting up the number of inodes and dentries, we
change the slab allocator to keep count of how many pages are currently used
by slabs which can be shrunk by the VM.

The creator of the slab marks the slab as being reclaimable at
kmem_cache_create()-time.  Slab keeps a global counter of pages which are
currently in use by thus-tagged slabs.

Of course, we now slightly overestimate the amount of reclaimable memory,
because not _all_ of the icache, dcache, mbcache and quota caches are
reclaimable.

But I think it's better to be a bit permissive rather than bogusly failing
brk() calls as we do at present.

From: Neil Brown <neilb@cse.unsw.edu.au>

When an NFS request arrives, it contains a filehandle which needs to be
converted to a dentry.  Many filesystems use find_exported_dentry in
fs/exportfs/expfs.c.  A key part of this on filesystem where a 32bit inode
number uniquely locates a file is export_iget which calls iget(sb, inum).

iget will either:

   1/ find the inode in the inode cache and return it

 or

   2/ create a new inode and call ->read_inode to load it from the
      storage device.

export_iget then verifies the inode is really a good inode (->read_inode
didn't detect any problems) and the right inode (base on generation number
from the file handle).

For this to work reliably, it is important that whenever an inode is *not* in
the cache, the on-device version is up-to-date.  Otherwise, when read_inode
loads the inode it will get bad data.

For a file that has not been deleted, this condition always holds: a dirty
inode is always flushed to disc before the inode is unhashed.

However for a file that is being deleted this condition doesn't (didn't)
hold.  When iput -> iput_final -> generic_drop_inode -> generic_delete_inode
is called we would unhash the inode before calling into the filesytem through
->delete_inode.

So there is a small window between when generic_delete_inode unhashes the
inode, and when ->delete_inode writes something to disc, where a call to
->read_inode (for export_iget) might discover what it thinks is a valid
inode, but is really one that is in the process of being destroyed.

It is this window that I want to close by moving the unhashing to the end of
generic_delete_inode.

From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

There are a couple of places in the readdir code where it forgets to set
the returned error code to -EFAULT, leaving it at the default -EINVAL.

Fix that up, and rename getdents_callback64.count to "result", which makes
more sense.

From zwane

We shutdown the MAC part of the card and have interrupts disabled, interrupt
gets queued, we reenable interrupts after shutting down device, service the
interrupt, check status and get 0xff from powered down device.

No idea what he's talking about here, but apparently the irq return handling
isn't working out.  Just return IRQ_HANDLED all the time.

From: Oleg Drokin <green@namesys.com>

This is a forward port of 2.4's inode attributes support for reiserfs.
Original implementation for 2.4 was performed by Nikita Danilov.

In order to enable this support, one must use "attrs" mount options, eg:

	mount /dev/hda1 /mount/pont -t reiserfs -o attrs

Also either the filesystem must have been created with a recent mkreiserfs
or must have been modified by a recent version of reiserfsck with its
"--clean-attributes" option.

If that is not done, attributes support will not be enabled and a kernel
message will be printed.  This is necessary because old kernels left random
garbage in the place where these attributes now live.

These attributes are totally compatible with ext2's ones.  You can
manipulate them with chattr/lsattr etc.

Additionally the chattr 'd' option may be used to disable tail packing on a
specific file or a directory tree.  (The 'd' option normally means "don't
dump".  reiserfs has overloaded it).

From: Zwane Mwaikambo <zwane@linuxpower.ca>

kapmd does a conditional check in order to decide whether to set the task's
cpu affinity mask.  This can change during runtime, therefore we
unconditionally set it.  There is an early exit in set_cpus_allowed if the
current processor is in the allowed mask anyway.

__unhash_process acquires the dcache_lock while holding the
tasklist_lock for writing. This can deadlock. Additionally,
fs/proc/base.c incorrectly assumed that p->pid would be set to 0 during
release_task.

The patch fixes that by adding a new spinlock to the task structure and
fixing all references to (!p->pid).

The alternative to the new spinlock would be to hold dcache_lock around
__unhash_process.

- fs/proc/base.c assumed that p->pid is reset to 0 during exit.  This is
  not the case anymore.  I now look at the count of the pid structure for
  PIDTYPE_PID.

- de_thread now tested - as broken as it was before: open handles to
  /proc/<pid> are either stale or invalid after an exec of a nptl process,
  if the exec was call from a secondary thread.

- a few lock_kernels removed - that part of /proc doesn't need it.

- additional instances of 'if(current->pid)' replaced with pid_alive.

From: William Lee Irwin III <wli@holomorphy.com>

mpc_apicid is a u8, and MAX_APICS can be 256.

fs/compat.c: In function `compat_sys_ioctl':
fs/compat.c:324: warning: implicit declaration of function `siocdevprivate_ioctl'

Don't assume the size of dev_t: on ppc64 it is unsignedlong and this
generates a printk warning.

arch/ppc64/kernel/htab.c:105: warning: implicit declaration of function `pSeries_lpar_hpte_insert'
arch/ppc64/kernel/htab.c:109: warning: implicit declaration of function `pSeries_hpte_insert'

Fix a printk warning

two printk warnings

warning: assignment makes pointer from integer without a cast

It needs sched.h for `current'.