From: Jan Kara <jack@suse.cz>

This implements autoloading of quota modules. 

From: Andreas Gruenbacher <agruen@suse.de>

This patch removes the dependency on i_sem in the getxattr and
listxattr iops of ext2 and ext3. In addition, the global ext[23]_xattr
semaphores go away. Instead of i_sem and the global semaphore, mutual
exclusion is now ensured by per-inode xattr semaphores, and by locking
the buffers before modifying them. The detailed locking strategy is
described in comments in fs/ext[23]/xattr.c.

Due to this change it is no longer necessary to take i_sem in
ext[23]_permission() for retrieving acls, so the
ext[23]_permission_locked() functions go away.

Additionally, the patch fixes a race condition in ext[23]_permission:
Accessing inode->i_acl was protected by the BKL in 2.4; in 2.5 there no
longer is such protection. Instead, inode->i_acl (and inode->i_default_acl)
are now accessed under inode->i_lock. (This could be replaced by RCU in
the future.)

In the ext3 extended attribute code, an new uglines results from locking
at the buffer head level: The buffer lock must be held between testing
if an xattr block can be modified and the actual modification to prevent
races from happening. Before a block can be modified,
ext3_journal_get_write_access() must be called. But this requies an unlocked
buffer, so I call ext3_journal_get_write_access() before locking the
buffer. If it turns out that the buffer cannot be modified,
journal_release_buffer() is called. Calling ext3_journal_get_write_access
after the test but while the buffer is still locked would be much better.

From: Andreas Gruenbacher <agruen@suse.de>

Andrew Morton found that there is lock contention between extended
attribute operations (like reading ACLs, which `ls -l' needs to do)
and other operations on the same files. This is due to the fact that
all extended attribute syscalls take inode->i_sem before calling into
the filesystem code.

To fix this problem, this patch no longer takes inode->i_sem in the
getxattr and listxattr syscalls, and moves the lock taking code into
the file systems. (Another patch improves the locking strategy in
ext2 and ext3.)

From: Andreas Gruenbacher <agruen@suse.de>

It is common to update extended attributes without changing the value's
length. This patch optimizes this case. In addition to that, the current
code tries to recognize early when extended attribute blocks become
empty. This optimization is not of significant value, so this patch
removes it, and moves the empty block test further down.

From: Andreas Gruenbacher <agruen@suse.de>

The inode->i_bdev field is not the same as inode->i_sb->s_bdev or bh->b_bdev.
We must compare inode->i_sb->s_bdev with bh->b_bdev, or else equal extended
attribute block will not be found.

From: From: Andreas Gruenbacher <agruen@suse.de>

* Various minor cleanups and simplifications in the extended attributes
  and acl code.

* Use a smarter shortcut rule in ext[23]_permission(): If the mask
  contains permissions that are not also contained in the group
  file mode permission bits, those permissions can never be granted by
  an acl. (The previous shortcut rule was more coarse.)

From: Daniele Belluci <bellucda@tiscali.it>

proc_attr_lookup() was missed out in Trond's conversion.  (It is behind
CONFIG_SECURITY).

- use ll_rw_block().

- use READA

- export it to modules.

- xfs printk warning fix (dev_t is ulong on ppc64)

- unused var in serial_remove() (Daniele Bellucci <bellucda@tiscali.it>)

From: Mikael Pettersson <mikpe@csd.uu.se>

This patch fixes two p->thread_info->cpu occurrences in kernel/sched.c to
use the task_cpu(p) macro instead, which is optimised on UP.  Although one
of the occurrences is under #ifdef CONFIG_SMP, it's bad style to use the
raw non-optimisable form in non-arch code.

in the networking code.

From YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

Architecture specific flat loader code for v850 moved into its
own v850 flat.h header. This patch also adds supporti for a number
of relocation cases that need to be handled at laod time.

Most of this code is originally from Miles Bader <miles@gnu.org>.

Architecture specific flat loader code for m68knommu moved into its
own m68knommu flat.h header. Part of the shared library flat loader
update.

Architecture specific flat loader code for H8/300 moved into its
own H8/300 flat.h header.

This patch adds shared library support to the MMU application
loader, binfmt_flat. This is not new, it is a forward port from the
same support in 2.4.x kernels with MMUless support, and has been
running for well over a year now. The code support is conditionally
compiled on CONFIG_BINFMT_FLAT_SHARED. This change also abstracts
a bit more architecture dependent code into the separate flat.h
includes.

Basically relocations within an application also carry a tag to
identify what they refer too (this code or which shared library).
This is patched as before at load/run-time with an appropriate
address.

Unify access_ok for all m68knommu targets. All targets use the
common linker script and have common end symbols. So now we can
just use a simple check.

Remove "%d0" register from clobber list of down_trylock() for
m68knommu. It is not used by the asm code here at all.

Force PAGE_SIZE for the m68knommu architecture to be an unsigned long.
This makes it consistent with all other architectures and cleans up
a load of compiler warnings.

Conditionally copy the ROMfs filesystem on the Motorola M5307C3
target board only if using a ROMfs.

Allow setting boot time parameters at configuration for Motorola
5282 targets.

This improves cold-cache program startup noticeably for me, and
simplifies the read-ahead logic at the same time. The rules for
read-ahead are:

 - if the vma is marked random, we just do the regular one-page case. 
   Obvious.

 - if the vma is marked "linear access", we use the regular readahead
   code. No change in behaviour there (well, we also only consider it a 
   _miss_ if it was marked linear access - the "readahead" and
   "readaround"  things are now totally independent of each other)

 - otherwise, we look at how many hits/misses we've had for this 
   particular file open for mmap, and if we've had noticeably more
   misses than hits, we don't bother with read-around.

In particular, this means that the "real" read-ahead logic literally
only needs to worry about finding sequential accesses, and does not
have to worry about the common executable mmap access patthers that 
have very different behaviour.

Some constant tweaking may be a good idea.

in add_timer_internal() we simply leave the timer pending forever if the
expiry is in more than 0xffffffff jiffies. This means more than 48 days on
eg. ia64 - which is not an unrealistic timeout. IIRC crond is happy to use
extremely large timeouts.

It's better to time out early (if you can call 48 days "early") than to
not time out at all.

This offers a generic do_div64() that actually does the right thing,
unlike some architectures that "optimized" the 64-by-32 divide into
just a 32-bit divide.

Both ppc and sh were already providing an assembly optimized
__div64_32().  I called my function the same, so that their optimized
versions will automatically override mine in lib.a.

I've only tested extensively on m68knommu (uClinux) and made
sure generated code is reasonably short. Should be ok also on
parisc, since it's the same algorithm they were using before.

 - add generic C implementations of the do_div() for 32bit and 64bit
   archs in asm-generic/div64.h;

 - add generic library support function __div64_32() to handle the
   full 64/32 case on 32bit archs;

 - kill multiple copies of generic do_div() in architecture
   specific subdirs. Most copies were either buggy or not doing
   what they were supposed to do;

 - ensure all surviving instances of do_div() have their parameters
   correctly parenthesized to avoid funny side-effects;

Fix arbitration between net open and tty open.

Cleanup missed bits of CUA device removal changes.

Fix arbitration between net open and tty open.

Clean up unused locals resulting from latest tty changes.

Fix arbitration between net open and tty open.

Cleanup unused local resulting from latest tty changes.

From Mikael Petterson:


  Booting kernel 2.5.74 on a PowerMac with CONFIG_BLK_DEV_IDE_PMAC=y
  results in an oops during IDE init, and the box then reboots.

  The patch below updates drivers/ide/ppc/pmac.c to also set up the
  hwif->ide_dma_queued_off and hwif->ide_dma_queued_on function
  pointers, which fixes the oops. Tested on my ancient PM4400.

I no longer have the time/interest in nbd, and Paul agreed to take it
over.

The compat ioctls for device mapper were not being enabled due to an
incorrect config option.

This tweaks the mmap read-ahead behaviour so that the prefaulting
is largely pointless.

 - double the minimum readaround chunksize in page_cache_readaround().

 - when a seek is detected, collapse the window more slowly.

i2o_scsi.c now needs pci.h.

From: ilmari@ilmari.org (Dagfinn Ilmari Mannsaker)

It turns out that net/bluetooth/rfcomm/sock.c (and
net/bluetooth/hci_sock.c) had been left out when net_proto_family gained an
owner field, here's a patch that fixes them both.

From: junkio@cox.net

Sigh.  Is there a gcc option to tell it to not accept this incompatible C99
extension?

From: Arvind Kandhare <arvind.kan@wipro.com>

When switch_uid is called, the reference count of the new user is
incremented twice.  I think the increment in the switch_uid is done because
of the reparent_to_init() function which does not increase the __count for
root user.

But if switch_uid is called from any other function, the reference count is
already incremented by the caller by calling alloc_uid for the new user.
Hence the count is incremented twice.  The user struct will not be deleted
even when there are no processes holding a reference count for it.  This
does not cause any problem currently because nothing is dependent on timely
deletion of the user struct.

From: Davide Libenzi <davidel@xmailserver.org>

- Inline eventpoll_release() so that __fput() does not need to call in
  epoll code if the file itself is not registered inside an epoll fd

- Add <linux/types.h> inclusion due __u32 and __u64 usage

- Fix debug printf that would otherwise panic if enabled with the new
  epoll code

From: Davide Libenzi <davidel@xmailserver.org>

- Remove a couple of impossible debug checks (unsigneds cannot be
  negative!)

- If __alloc_bootmem_core() fails with a goal and unaligned node_boot_start
  it'll loop fovever.

If de_thread() fails in flush_old_exec() then we try to fail the execve().

That is a bad move, because exec_mmap() has already switched the current
process over to the new mm.  The new process is not yet sufficiently set up
to handle the error and the kernel doublefaults and dies.  exec_mmap() is the
point of no return.

Change flush_old_exec() to call de_thread() before running exec_mmap() so the
execing program sees the error.  I added fault injection to both de_thread()
and exec_mmap() - everything now survives OK.

From: Nick Piggin <piggin@cyberone.com.au>

Add some comments to the request allocation code.

- pass gfp_flags to get_io_context(): not all callers are forced to use
  GFP_ATOMIC().

- fix locking in get_io_context(): bump the refcount whilein the exclusive
  region.

- don't go oops in get_io_context() if the kmalloc failed.

- in as_get_io_context(): fail the whole thing if we were unable to
  allocate the AS-specific part.

- as_remove_queued_request() cleanup