Implement quota journaling and quota reading and writing functions for
reiserfs.  Solves also several other deadlocks possible for reiserfs due to
the lock inversion on journal_begin and quota locks.

From: Vladimir Saveliev <vs@namesys.com>

When CONFIG_QUOTA is defined reiserfs's finish_unfinished sets and clears
MS_ACTIVE bit in s_flags field of super block.  If that bit was set already
it should not be set.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Implementation of quota reading and writing functions for ext3.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Implementation of quota reading and writing functions for ext2.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Fix possible races between umount and quota on/off.

Finally I decided to take a reference to vfsmount during vfs_quota_on() and
to drop it after the final cleanup in the vfs_quota_off().  This way we
should be all the time guarded against umount.  This way was protected also
the old code which used filp_open() for opening quota files.  I was also
thinking about other ways of protection but there would be always a window
(provided I don't want to play much with namespace locks) where
vfs_quota_on() could be called while umount() is in progress resulting in
the "Busy inodes after unmount" messages...

Get a reference to vfsmount during quotaon() so that we are guarded against
umount (as was the old code using filp_open()).
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The four patches in this series fix deadlocks with quotas of pagelock (the
problem was lock inversion on PageLock and transaction start - quota code
needed to first start a transaction and then write the data which subsequently
needed acquisition of PageLock while the standard ordering - PageLock first
and transaction start later - was used e.g.  by pdflush).  They implement a
new way of quota access to disk: Every filesystem that would like to implement
quotas now has to provide quota_read() and quota_write() functions.  These
functions must obey quota lock ordering (in particular they should not take
PageLock inside a transaction).

The first patch implements the changes in the quota core, the other three
patches implement needed functions in ext2, ext3 and reiserfs.  The patch for
reiserfs also fixes several other lock inversion problems (similar as ext3
had) and implements the journaled quota functionality (which comes almost for
free after the locking fixes...).

The quota core patch makes quota support in other filesystems (except XFS
which implements everything on its own ;)) unfunctional (quotaon() will refuse
to turn on quotas on them).  When the patches get reasonable wide testing and
it will seem that no major changes will be needed I can make fixes also for
the other filesystems (JFS, UDF, UFS).

This patch:

The patch implements the new way of quota io in the quota core.  Every
filesystem wanting to support quotas has to provide functions quota_read()
and quota_write() obeying quota locking rules.  As the writes and reads
bypass the pagecache there is some ugly stuff ensuring that userspace can
see all the data after quotaoff() (or Q_SYNC quotactl).  In future I plan
to make quota files inaccessible from userspace (with the exception of
quotacheck(8) which will take care about the cache flushing and such stuff
itself) so that this synchronization stuff can be removed...

The rewrite of the quota core. Quota uses the filesystem read() and write()
functions no more to avoid possible deadlocks on PageLock. From now on every
filesystem supporting quotas must provide functions quota_read() and
quota_write() which obey the quota locking rules (e.g. they cannot acquire the
PageLock).
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Attached patch fixes debug messages of quota code in reiserfs so that they
compile.  Chris Mason agreed the patch.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Attached patch exposes reiserfs_sync_fs().  This call is needed by the new
quota code to write data to disk on quotaoff so that userspace can see them
afterwards.  Chris Mason agrees with the patch.

Make reiserfs provide the sync_fs() function so that the quota code
has a way to reliably force a transaction to disk.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Fix a 4-level page table bug that slipped through (introduced by me,
not Andi).

Compiles and boots on ia64 and 2-level i386.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Pretty much all the TF-related comments were stale, and
had been for a long time. Fix them up, clean up code.

PT_DTRACE without PT_PTRACED.

Long ago, the "D" in PT_DTRACE meant "Delayed", and it was used
as a flag to mark that we had ptrace'd the process but no longer
did so. That hasn't been true in a while now, and the flag should
probably be renamed, but in the meantime the test for PT_PTRACED
being cleared had been corrupted into something totally nonsensical.

Pointed out by Andi Kleen.

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

Quieten down compiler warnings, and fix an off-by-one bug when
deciding whether to include the next word.

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

It didn't allocate space for the final terminating entry,
which caused it to overwrite the next slab entry, which in turn
sometimes ended up being a slab array cache pointer. End result:
total slab cache corruption at a random time afterwards. Very
nasty.

some trivial iomem annotations were still missing
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

local variable used to store flags after spin_lock_irqsave() should be
unsigned long, not u32.  That should complete the 64bit cleanups in
there.
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

 - get_user() __gu_val should be unsigned long (same as with i386 patch)
 - __copy_to_user() et.al. didn't have proper type checking
 - documented the casts in __copy_tofrom_user() calls with __force.
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

nfsim gains sysctl support, and sure enough, --failtest uncovered an
unregister when the registration had failed.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Someone thought it would be clever if proc code ignores removal of
non-existent entries.  Hence, we missed that /proc/net/stat/ip_conntrack
is never removed on module removal or init failure.

Found by nfsim.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Somehow parport_pc.c ended up with mixed old-style and new-style module
parameters, but mixing them is not allowed.

Use module_param() instead of MODULE_PARM() -- cannot be mixed.
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Although the CG6 framebuffer is detected and initialized, without this
patch all it displays is a blank screen. Tested on an Ultra 1 with a
TGX+.

Originally from Bob Breuer for the CG14.
Signed-off-by: Adam Kropelin <akropel1@rochester.rr.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

sparc32 had a conflicting _exit, removed the line from asm-
sparc/unistd.h. This is the same change that DaveM made to sparc64 here:
http://linux.bkbits.net:8080/linux-2.6/diffs/include/asm-
sparc64/unistd.h@1.33

Warning was:
In file included from include/linux/unistd.h:9,
                 from init/main.c:45:
include/asm/unistd.h:489: warning: conflicting types for built-in
function '_exit'
Signed-off-by: Tom 'spot' Callaway <tcallawa@redhat.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Squelch the floppy compile warning:

include/asm/floppy.h: In function `sun_fd_request_irq':
include/asm/floppy.h:276: warning: passing arg 2 of `request_fast_irq'
from incompatible pointer type
Signed-off-by: Tom 'spot' Callaway <tcallawa@redhat.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Fix missing cases for vm fault codes in sparc32 fault handling, and
convert the entire file to using symbolic fault codes. This fixes a
latent bug where an allocation failure returns to the kernel instead of
delivering an error as expected.
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Add a sparc #ifdef to drivers/char/rtc.c and iomem annotations to
drivers/sbus/char/rtc.c
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

serio is unused except in the #ifdef CONFIG_SERIO paths. To kill the
warning, make the declaration conditional on the same.
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/sparc/kernel/pcic.c trips numerous warnings due to iomem
annotations. This patch adds various needed iomem annotations.
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

sparc32 svr4_setcontext() needs to return a value in the SIGSEGV path.
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The latter hunk of the forwarded patch has already been applied, so
please apply the patch as it appears in the un-forwarded part. I've
taken some liberties in adding the Acked/Signed-off lines in what I
hope is an agreeable way.

On Sun, Nov 14, 2004 at 11:16:40PM -0500, Jurij Smakov wrote:
> As a followup: I have tried fiddling more with the memcpy() routine.
> Insight from Rob Radez and comments in arch/sparc/lib/blockops.S suggest,
> that __copy_1page assumes that the memory regions copied are aligned on a
> double-word boundary. I have checked, that in the cramfs case it wasn't
> true, the destination was not aligned on the double-word boundary. So, I
> have implemented a simple workaround (see patch below), which together
> with Bob Breuer's iommu.c fix [0] made 2.6.8 kernel to boot on my
> machine (SS10 with Ross Hypersparc CPU)! I also confirm, that adding the
> suggested fix to the srmmu.c also [1] breaks sunlance on my machine. With
> that "fix" the line 'eth0: Memory error, status 88c3, addr 3713ba' is
> displayed continuously during boot, when it comes to configuring network
> interfaces. The successful patch for me is:
Acked-by: William Irwin  <wli@holomorphy.com>
Acked-by: Dave Miller  <davem@davemloft.net>
Signed-off-by: Jurij Smakov <jurij@wooyd.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Chris Newport and Thomas Bogendoerfer have been working to get the
sun4d port functional again. This patch updates 2.6.10-rc3 to a current
snapshot of their work. It does the following 3 things:

(1) add sun4d hook to sbus_bus_ranges_init()
(2) fix up pgd_offset() call in sun4d iommu code
(3) fix up sun4d's definition of current
Signed-off-by: Chris Newport <crn@netunix.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

DVMA is having aliasing problems. Bob originally sent in the following
description:

At some point in the past, Bob Breuer wrote:
> Here's the preliminary patch.  This time around, both the hme
> and esp drivers are working for me.  This replaces my previous
> patch and is against the vanilla 2.6.9 kernel.  I've tried to
> reduce the amount of unnecessary cache flushing, therefore this
> will need some testing on non-hypersparc cpus also.  It needs
> some cleanup yet, and will be rediffed against a later kernel.
> I'm looking for comments and feedback.

This patch represents one of those subsequent rediffings.
Signed-off-by: Bob Breuer <breuerr@mc.net>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/block/floppy.c: In function `init_module':
drivers/block/floppy.c:4598: error: parse error before "UTS_RELEASE"

Not sure what went wrong here - just kill the thing.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The recent ipv6 "fix" broke the build:

security/selinux/avc.c: In function `avc_audit':
security/selinux/avc.c:581: warning: implicit declaration of function `inet6_sk'
security/selinux/avc.c:581: warning: initialization makes pointer from integer without a cast
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch contains two fixes for VIA PadLock compilation with GCC 2.95.3
and GCC 3.4.3 (original patch was tested with 3.3.4 only).
Signed-off-by: Michal Ludvig <michal@logix.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/memory.c:1944:6: missing binary operator before token "long"

The preprocessor doesn't like the typecast....

PTRS_PER_PGD isn't used in assembly code, so this looks to be safe enough..

This patch helps, but the ia64 build is still broken.  There is no
implementation of __pmd_alloc().

Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/memory.c: In function `zeromap_pud_range':
mm/memory.c:1053: warning: suggest parentheses around + or - inside shift
mm/memory.c: In function `remap_pud_range':
mm/memory.c:1170: warning: suggest parentheses around + or - inside shift

Parenthesize this macro arg.

Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

On sparc64:

drivers/ide/setup-pci.c:310: error: `DMA_32BIT_MASK' undeclared (first use in this function)
drivers/ide/setup-pci.c:310: error: (Each undeclared identifier is reported only once
drivers/ide/setup-pci.c:310: error: for each function it appears in.)
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Nasty bug, caught while writing the ECN target test.  Corrupts
checksums of packets when target is used on them.

Let this be a warning on the evils of casts.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>