UAPI: (Scripted) Disintegrate include/linux/raid

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dave Jones <davej@redhat.com>
gpio-timberdale: fix a potential wrapping issue

->last_ier is an unsigned long but the high bits can't be used int the
original code because the shift wraps.

Cc: stable@kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Merge tag 'disintegrate-raid-20121009' of git://git.infradead.org/users/dhowells/linux-headers into for-next

UAPI Disintegration 2012-10-09
gpio-74x164: Fix buffer allocation size

The new registers handling in the gpio-74x164 driver allocates chip->registers
* 8 bytes where only one byte per register is necessary. This patch fixes this.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
md faulty: use disk_stack_limits()

in:
fe86cdce block: do not artificially constrain max_sectors for stacking drivers

max_sectors defaults to UINT_MAX.  md faulty wasn't using
disk_stack_limits(), so inherited this large value as well.
This triggered a bug in XFS when stressed over md_faulty, when
a very large bio_alloc() failed.

That was on an older kernel, and I can't reproduce exactly the
same thing upstream, but I think the fix is appropriate in any
case.

Thanks to Mike Snitzer for pointing out the problem.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
blkcg: Fix use-after-free of q->root_blkg and q->root_rl.blkg

blk_put_rl() does not call blkg_put() for q->root_rl because we
don't take request list reference on q->root_blkg.
However, if root_blkg is once attached then detached (freed),
blk_put_rl() is confused by the bogus pointer in q->root_blkg.

For example, with !CONFIG_BLK_DEV_THROTTLING &&
CONFIG_CFQ_GROUP_IOSCHED,
switching IO scheduler from cfq to deadline will cause system stall
after the following warning with 3.6:

> WARNING: at /work/build/linux/block/blk-cgroup.h:250
> blk_put_rl+0x4d/0x95()
> Modules linked in: bridge stp llc sunrpc acpi_cpufreq freq_table mperf
> ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4
> Pid: 0, comm: swapper/0 Not tainted 3.6.0 #1
> Call Trace:
>  <IRQ>  [<ffffffff810453bd>] warn_slowpath_common+0x85/0x9d
>  [<ffffffff810453ef>] warn_slowpath_null+0x1a/0x1c
>  [<ffffffff811d5f8d>] blk_put_rl+0x4d/0x95
>  [<ffffffff811d614a>] __blk_put_request+0xc3/0xcb
>  [<ffffffff811d71a3>] blk_finish_request+0x232/0x23f
>  [<ffffffff811d76c3>] ? blk_end_bidi_request+0x34/0x5d
>  [<ffffffff811d76d1>] blk_end_bidi_request+0x42/0x5d
>  [<ffffffff811d7728>] blk_end_request+0x10/0x12
>  [<ffffffff812cdf16>] scsi_io_completion+0x207/0x4d5
>  [<ffffffff812c6fcf>] scsi_finish_command+0xfa/0x103
>  [<ffffffff812ce2f8>] scsi_softirq_done+0xff/0x108
>  [<ffffffff811dcea5>] blk_done_softirq+0x8d/0xa1
>  [<ffffffff810915d5>] ?
>  generic_smp_call_function_single_interrupt+0x9f/0xd7
>  [<ffffffff8104cf5b>] __do_softirq+0x102/0x213
>  [<ffffffff8108a5ec>] ? lock_release_holdtime+0xb6/0xbb
>  [<ffffffff8104d2b4>] ? raise_softirq_irqoff+0x9/0x3d
>  [<ffffffff81424dfc>] call_softirq+0x1c/0x30
>  [<ffffffff81011beb>] do_softirq+0x4b/0xa3
>  [<ffffffff8104cdb0>] irq_exit+0x53/0xd5
>  [<ffffffff8102d865>] smp_call_function_single_interrupt+0x34/0x36
>  [<ffffffff8142486f>] call_function_single_interrupt+0x6f/0x80
>  <EOI>  [<ffffffff8101800b>] ? mwait_idle+0x94/0xcd
>  [<ffffffff81018002>] ? mwait_idle+0x8b/0xcd
>  [<ffffffff81017811>] cpu_idle+0xbb/0x114
>  [<ffffffff81401fbd>] rest_init+0xc1/0xc8
>  [<ffffffff81401efc>] ? csum_partial_copy_generic+0x16c/0x16c
>  [<ffffffff81cdbd3d>] start_kernel+0x3d4/0x3e1
>  [<ffffffff81cdb79e>] ? kernel_init+0x1f7/0x1f7
>  [<ffffffff81cdb2dd>] x86_64_start_reservations+0xb8/0xbd
>  [<ffffffff81cdb3e3>] x86_64_start_kernel+0x101/0x110

This patch clears q->root_blkg and q->root_rl.blkg when root blkg
is destroyed.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
blkcg: stop iteration early if root_rl is the only request list

__blk_queue_next_rl() finds next request list based on blkg_list
while skipping root_blkg in the list.
OTOH, root_rl is special as it may exist even without root_blkg.

Though the later part of the function handles such a case correctly,
exiting early is good for readability of the code.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
vfs: fix: don't increase bio_slab_max if krealloc() fails

Without the patch, bio_slab_max, representing bio_slabs capacity, is increased before krealloc() of bio_slabs. If krealloc() fails, bio_slab_max is too high. Fix that by only updating bio_slab_max if krealloc() is successful.

Signed-off-by: Anna Leuschner <anna.m.leuschner@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block: remove CONFIG_EXPERIMENTAL

This config item has not carried much meaning for a while now and is
almost always enabled by default. As agreed during the Linux kernel
summit, remove it.

CC: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/block: remove CONFIG_EXPERIMENTAL

This config item has not carried much meaning for a while now and is
almost always enabled by default. As agreed during the Linux kernel
summit, remove it.

CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Asai Thambi S P <asamymuthupa@micron.com>
CC: Pete Zaitcev <zaitcev@redhat.com>
CC: Cong Wang <xiyou.wangcong@gmail.com>
CC: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
gpio: mvebu: correctly set the value in direction_output()

The ->direction_output() operation of gpio_chip is supposed to set the
direction to output but also to set the GPIO to an initial
value. Unfortunately, this last part was not done until now, causing
for example the LEDs to not be properly set to their default initial
value. This patch fixes this by calling the mvebu_gpio_set() function
from mvebu_gpio_direction_output() before configuring the GPIO as an
output GPIO.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
block: Add blk_rq_pos(rq) to sort rq when plushing

My workload is a raid5 which had 16 disks. And used our filesystem to
write using direct-io mode.

I used the blktrace to find those message:
8,16   0     6647     2.453665504  2579  M   W 7493152 + 8 [md0_raid5]
8,16   0     6648     2.453672411  2579  Q   W 7493160 + 8 [md0_raid5]
8,16   0     6649     2.453672606  2579  M   W 7493160 + 8 [md0_raid5]
8,16   0     6650     2.453679255  2579  Q   W 7493168 + 8 [md0_raid5]
8,16   0     6651     2.453679441  2579  M   W 7493168 + 8 [md0_raid5]
8,16   0     6652     2.453685948  2579  Q   W 7493176 + 8 [md0_raid5]
8,16   0     6653     2.453686149  2579  M   W 7493176 + 8 [md0_raid5]
8,16   0     6654     2.453693074  2579  Q   W 7493184 + 8 [md0_raid5]
8,16   0     6655     2.453693254  2579  M   W 7493184 + 8 [md0_raid5]
8,16   0     6656     2.453704290  2579  Q   W 7493192 + 8 [md0_raid5]
8,16   0     6657     2.453704482  2579  M   W 7493192 + 8 [md0_raid5]
8,16   0     6658     2.453715016  2579  Q   W 7493200 + 8 [md0_raid5]
8,16   0     6659     2.453715247  2579  M   W 7493200 + 8 [md0_raid5]
8,16   0     6660     2.453721730  2579  Q   W 7493208 + 8 [md0_raid5]
8,16   0     6661     2.453721974  2579  M   W 7493208 + 8 [md0_raid5]
8,16   0     6662     2.453728202  2579  Q   W 7493216 + 8 [md0_raid5]
8,16   0     6663     2.453728436  2579  M   W 7493216 + 8 [md0_raid5]
8,16   0     6664     2.453734782  2579  Q   W 7493224 + 8 [md0_raid5]
8,16   0     6665     2.453735019  2579  M   W 7493224 + 8 [md0_raid5]
8,16   0     6666     2.453741401  2579  Q   W 7493232 + 8 [md0_raid5]
8,16   0     6667     2.453741632  2579  M   W 7493232 + 8 [md0_raid5]
8,16   0     6668     2.453748148  2579  Q   W 7493240 + 8 [md0_raid5]
8,16   0     6669     2.453748386  2579  M   W 7493240 + 8 [md0_raid5]
8,16   0     6670     2.453851843  2579  I   W 7493144 + 104 [md0_raid5]
8,16   0        0     2.453853661     0  m   N cfq2579 insert_request
8,16   0     6671     2.453854064  2579  I   W 7493120 + 24 [md0_raid5]
8,16   0        0     2.453854439     0  m   N cfq2579 insert_request
8,16   0     6672     2.453854793  2579  U   N [md0_raid5] 2
8,16   0        0     2.453855513     0  m   N cfq2579 Not idling.st->count:1
8,16   0        0     2.453855927     0  m   N cfq2579 dispatch_insert
8,16   0        0     2.453861771     0  m   N cfq2579 dispatched a request
8,16   0        0     2.453862248     0  m   N cfq2579 activate rq,drv=1
8,16   0     6673     2.453862332  2579  D   W 7493120 + 24 [md0_raid5]
8,16   0        0     2.453865957     0  m   N cfq2579 Not idling.st->count:1
8,16   0        0     2.453866269     0  m   N cfq2579 dispatch_insert
8,16   0        0     2.453866707     0  m   N cfq2579 dispatched a request
8,16   0        0     2.453867061     0  m   N cfq2579 activate rq,drv=2
8,16   0     6674     2.453867145  2579  D   W 7493144 + 104 [md0_raid5]
8,16   0     6675     2.454147608     0  C   W 7493120 + 24 [0]
8,16   0        0     2.454149357     0  m   N cfq2579 complete rqnoidle 0
8,16   0     6676     2.454791505     0  C   W 7493144 + 104 [0]
8,16   0        0     2.454794803     0  m   N cfq2579 complete rqnoidle 0
8,16   0        0     2.454795160     0  m   N cfq schedule dispatch

From above messages,we can find rq[W 7493144 + 104] and rq[W
7493120 + 24] do not merge.
Because the bio order is:
  8,16   0     6638     2.453619407  2579  Q   W 7493144 + 8 [md0_raid5]
  8,16   0     6639     2.453620460  2579  G   W 7493144 + 8 [md0_raid5]
  8,16   0     6640     2.453639311  2579  Q   W 7493120 + 8 [md0_raid5]
  8,16   0     6641     2.453639842  2579  G   W 7493120 + 8 [md0_raid5]
The bio(7493144) first and bio(7493120) later.So the subsequent
bios will be divided into two parts.
When flushing plug-list,because elv_attempt_insert_merge only support
backmerge,not supporting frontmerge.
So rq[7493120 + 24] can't merge with rq[7493144 + 104].

From my test,i found those situation can count 25% in our system.
Using this patch, there is no this situation.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
CC:Shaohua Li <shli@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
gpiolib: Don't return -EPROBE_DEFER to sysfs, or for invalid gpios

gpios requested with invalid numbers, or gpios requested from userspace via sysfs
should not try to be deferred on failure.

Cc: stable@kernel.org
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
gpio/omap: fix off-mode bug: clear debounce settings on free/reset

This change was originally titled "gpio/omap: fix off-mode bug: clear debounce
clock enable mask on free/reset". The title has been updated slightly to
reflect (what should be) the final fix.

When a GPIO is freed or shutdown, we need to ensure that any debounce settings
are cleared and if the GPIO is the only GPIO in the bank that is currently
using debounce, then disable the debounce clock as well to save power.

Currently, the debounce settings are not cleared on a GPIO free or shutdown and
so during a context restore on subsequent off-mode transition, the previous
debounce values are restored from the shadow copies (bank->context.debounce*)
leading to mismatch state between driver state and hardware state.

This was discovered when board code was doing

  gpio_request_one()
  gpio_set_debounce()
  gpio_free()

which was leaving the GPIO debounce settings in a confused state.  If that GPIO
bank is subsequently used with off-mode enabled, bogus state would be restored,
leaving GPIO debounce enabled which then prevented the CORE powerdomain from
transitioning.

To fix this, introduce a new function called _clear_gpio_debounce() to clear
any debounce settings when the GPIO is freed or shutdown. If this GPIO is the
last debounce-enabled GPIO in the bank, the debounce will also be cut.

Please note that we cannot use _gpio_dbck_disable() to disable the debounce
clock because this has been specifically created for the gpio suspend path
and is intended to shutdown the debounce clock while debounce is enabled.

Special thanks to Kevin Hilman for root causing the bug. This fix is a
collaborative effort with inputs from Kevin Hilman, Grazvydas Ignotas and
Santosh Shilimkar.

Testing:
- This has been unit tested on an OMAP3430 Beagle board, by requesting a gpio,
  enabling debounce and then freeing the gpio and checking the register
  contents, the saved register context and the debounce clock state.
- Kevin Hilman tested on 37xx/EVM board which configures GPIO debounce for the
  ads7846 touchscreen in its board file using the above sequence, and so was
  failing off-mode tests in dynamic idle. Verified that off-mode tests are
  passing with this patch.

V5 changes:
- Corrected author

Reported-by: Paul Walmsley <paul@pwsan.com>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Grazvydas Ignotas <notasas@gmail.com>
Cc: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
ext4: fix unjournaled inode bitmap modification

commit 119c0d4460b001e44b41dcf73dc6ee794b98bd31 changed
ext4_new_inode() such that the inode bitmap was being modified
outside a transaction, which could lead to corruption, and was
discovered when journal_checksum found a bad checksum in the
journal during log replay.

Nix ran into this when using the journal_async_commit mount
option, which enables journal checksumming.  The ensuing
journal replay failures due to the bad checksums led to
filesystem corruption reported as the now infamous
"Apparent serious progressive ext4 data corruption bug"

[ Changed by tytso to only call ext4_journal_get_write_access() only
  when we're fairly certain that we're going to allocate the inode. ]

I've tested this by mounting with journal_checksum and
running fsstress then dropping power; I've also tested by
hacking DM to create snapshots w/o first quiescing, which
allows me to test journal replay repeatedly w/o actually
power-cycling the box.  Without the patch I hit a journal
checksum error every time.  With this fix it survives
many iterations.

Reported-by: Nix <nix@esperi.org.uk>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
xen/blkback: Fix compile warning

drivers/block/xen-blkback/xenbus.c:260:5: warning: symbol 'xenvbd_sysfs_addif' was not declared. Should it be static?
drivers/block/xen-blkback/xenbus.c:284:6: warning: symbol 'xenvbd_sysfs_delif' was not declared. Should it be static?

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
floppy: don't call alloc_ordered_workqueue inside the alloc_disk loop

Since commit 070ad7e ("floppy: convert to delayed work and single-thread
wq"), we end up calling alloc_ordered_workqueue multiple times inside
the loop, which shouldn't be intended. Besides the leak, other side
effect in the current code is if blk_init_queue fails, we would end up
calling unregister_blkdev even if we didn't call yet register_blkdev.

Just moved the allocation of floppy_wq before the loop, and adjusted the
code accordingly.

Cc: stable@vger.kernel.org # 3.5+
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
floppy: do put_disk on current dr if blk_init_queue fails

If blk_init_queue fails, we do not call put_disk on the current dr
(dr is decremented first in the error handling loop).

Cc: stable@vger.kernel.org
Reviewed-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
floppy: properly handle failure on add_disk loop

On floppy initialization, if something failed inside the loop we call
add_disk, there was no cleanup of previous iterations in the error
handling.

Cc: stable@vger.kernel.org
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
floppy: use common function to check if floppies can be registered

The same checks to see if a drive can be or is registered are
repeated through the code, factor out the checks in a common function
and replace the repeated checks with it.

Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>