GitHub/exynos8895/android_kernel_samsung_universal8895.git
13 years agoxen/blkback: fix xenbus_transaction_start() hang caused by double xenbus_transaction_...
Laszlo Ersek [Fri, 13 May 2011 13:45:40 +0000 (09:45 -0400)]
xen/blkback: fix xenbus_transaction_start() hang caused by double xenbus_transaction_end()

vbd_resize() up_read()'s xs_state.suspend_mutex twice in a row via double
xenbus_transaction_end() calls. The next down_read() in
xenbus_transaction_start() (at eg. the next resize attempt) hangs.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=618317

Acked-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Align the tabs on the structure.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 22:02:28 +0000 (18:02 -0400)]
xen/blkback: Align the tabs on the structure.

The recent changes caused this field of the structure to be offset a bit.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: if log_stats is enabled print out the data.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 21:23:30 +0000 (17:23 -0400)]
xen/blkback: if log_stats is enabled print out the data.

And not depend on the driver being built with -DDEBUG flag.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Add the prefix XEN in the common.h.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:58:21 +0000 (16:58 -0400)]
xen/blkback: Add the prefix XEN in the common.h.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Prefix 'vbd' with 'xen' in structs and functions.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:53:56 +0000 (16:53 -0400)]
xen/blkback: Prefix 'vbd' with 'xen' in structs and functions.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Change structure name blkif_st to xen_blkif.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:47:48 +0000 (16:47 -0400)]
xen/blkback: Change structure name blkif_st to xen_blkif.

No need for that '_st' and xen_blkif is more apt.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Remove the unused typedefs.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:37:04 +0000 (16:37 -0400)]
xen/blkback: Remove the unused typedefs.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move include/xen/blkif.h into drivers/block/xen-blkback/common.h
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:31:51 +0000 (16:31 -0400)]
xen/blkback: Move include/xen/blkif.h into drivers/block/xen-blkback/common.h

Not point of the blkif.h file. It is not used by the frontend.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fixing some more of the cleanpatch.pl warnings.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:23:06 +0000 (16:23 -0400)]
xen/blkback: Fixing some more of the cleanpatch.pl warnings.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Checkpatch.pl recommend against multiple assigments.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:19:23 +0000 (16:19 -0400)]
xen/blkback: Checkpatch.pl recommend against multiple assigments.

CHECK: multiple assignments should be avoided

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix checkpatch.pl warnings about more than 80 lines.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:14:15 +0000 (16:14 -0400)]
xen/blkback: Fix checkpatch.pl warnings about more than 80 lines.

Break up the macro usage.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Flesh out the description in the Kconfig.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:10:55 +0000 (16:10 -0400)]
xen/blkback: Flesh out the description in the Kconfig.

with more details.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix spelling mistakes.
Konrad Rzeszutek Wilk [Wed, 11 May 2011 20:26:59 +0000 (16:26 -0400)]
xen/blkback: Fix spelling mistakes.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move blkif_get_x86_[32|64]_req to common.h in block/xen-blkback dir.
Konrad Rzeszutek Wilk [Wed, 11 May 2011 20:23:39 +0000 (16:23 -0400)]
xen/blkback: Move blkif_get_x86_[32|64]_req to common.h in block/xen-blkback dir.

From the blkif.h header, which was exposed to the frontend.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Removing the debug_lvl option.
Konrad Rzeszutek Wilk [Wed, 11 May 2011 20:21:08 +0000 (16:21 -0400)]
xen/blkback: Removing the debug_lvl option.

It is not really used for anything.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Use the DRV_PFX in the pr_.. macros.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:43:12 +0000 (16:43 -0400)]
xen/blkback: Use the DRV_PFX in the pr_.. macros.

To make it easier to read.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Make the DPRINTK uniform.
Konrad Rzeszutek Wilk [Wed, 11 May 2011 20:15:24 +0000 (16:15 -0400)]
xen/blkback: Make the DPRINTK uniform.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Change printk/DPRINTK to pr_.. type variant.
Konrad Rzeszutek Wilk [Thu, 12 May 2011 20:42:31 +0000 (16:42 -0400)]
xen/blkback: Change printk/DPRINTK to pr_.. type variant.

And also make them uniform and prefix the message with 'xen-blkback'.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fixed up comments and converted spaces to tabs.
Konrad Rzeszutek Wilk [Wed, 11 May 2011 19:57:09 +0000 (15:57 -0400)]
xen/blkback: Fixed up comments and converted spaces to tabs.

Suggested-by: Ian Campbell <Ian.Campbell@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix up some of the comments.
Konrad Rzeszutek Wilk [Thu, 5 May 2011 17:42:10 +0000 (13:42 -0400)]
xen/blkback: Fix up some of the comments.

They had the wrong data or were in the wrong spot.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Squash the checking for operation into dispatch_rw_block_io
Konrad Rzeszutek Wilk [Thu, 5 May 2011 17:37:23 +0000 (13:37 -0400)]
xen/blkback: Squash the checking for operation into dispatch_rw_block_io

We do a check for the operations right before calling dispatch_rw_block_io.
And then we do the same check in dispatch_rw_block_io. This patch
squashes those checks into the 'dispatch_rw_block_io' function.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Add support for BLKIF_OP_FLUSH_DISKCACHE and drop BLKIF_OP_WRITE_BARRIER.
Konrad Rzeszutek Wilk [Wed, 4 May 2011 21:07:27 +0000 (17:07 -0400)]
xen/blkback: Add support for BLKIF_OP_FLUSH_DISKCACHE and drop BLKIF_OP_WRITE_BARRIER.

We drop the support for 'feature-barrier' and add in the support
for the 'feature-flush-cache' if the real backend storage supports
flushing.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen-blkfront: Provide for 'feature-flush-cache' the BLKIF_OP_WRITE_FLUSH_CACHE operation.
Konrad Rzeszutek Wilk [Thu, 5 May 2011 16:41:03 +0000 (12:41 -0400)]
xen-blkfront: Provide for 'feature-flush-cache' the BLKIF_OP_WRITE_FLUSH_CACHE operation.

The operation BLKIF_OP_WRITE_FLUSH_CACHE has existed in the Xen
tree header file for years but it was never present in the Linux tree
because the frontend (nor the backend) supported this interface.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoRevert "xen/blkback: Move the plugging/unplugging to a higher level."
Konrad Rzeszutek Wilk [Wed, 27 Apr 2011 16:40:11 +0000 (12:40 -0400)]
Revert "xen/blkback: Move the plugging/unplugging to a higher level."

This reverts commit 97961ef46b9b5a6a7c918a38b898a7b3e49869f4 b/c
we lose about 15% performance if we do the unplugging and the
end of the reading the ring buffer.

13 years agoxen/blkback: Stick REQ_SYNC on WRITEs to deal with CFQ I/O scheduler.
Konrad Rzeszutek Wilk [Tue, 26 Apr 2011 20:24:18 +0000 (16:24 -0400)]
xen/blkback: Stick REQ_SYNC on WRITEs to deal with CFQ I/O scheduler.

If one runs a simple fio request with random read/write with a
20%/80% ratio, the numbers are incredibly bad when using the CFQ scheduler.

IOmeter       |       |      |          |
64K, randrw   |  NOOP | CFQ  | deadline |
randrwmix=80  |       |      |          |
--------------+-------+------+----------+
blkback       |103/27 |32/10 | 102/27   |
--------------+-------+------+----------+
QEMU qdisk    |103/27 |102/27| 102/27   |

The problem as explained by Vivek Goyal was:

".. that difference is that sync vs async requests. In the case of
a kernel thread submitting IO, [..] all the WRITES might be being
considered as async and will go in a different queue. If you mix those
with some READS, they are always sync and will go in differnet queue.
In presence of sync queue, CFQ will idle and choke up WRITES in
an attempt to improve latencies of READs.

In case of AIO [note: this is what QEMU qdisk is doing] , [..]
it is direct IO and both READS and WRITES will be considered SYNC
and will go in a single queue and no choking of WRITES will take place."

The solution is quite simple, tack on REQ_SYNC (which is
what the WRITE_ODIRECT macro points to) and the numbers go
back up.

Suggested-by: Vivek Goyal <vgoyal@redhat.com
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move the plugging/unplugging to a higher level.
Konrad Rzeszutek Wilk [Tue, 26 Apr 2011 16:57:59 +0000 (12:57 -0400)]
xen/blkback: Move the plugging/unplugging to a higher level.

We used to the plug/unplug on the submit_bio. But that means
if within a stream of WRITE, WRITE, WRITE,...,WRITE we have
one READ, it could stall the pipeline (as the 'submio_bio'
could trigger the unplug_fnc to be called and stall/sync
when doing the READ). Instead we want to move the unplugging
when the whole (or as a much as possible) ring buffer has been
processed. This also eliminates us doing plug/unplug for
each request.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Prefix exposed functions with xen_
Konrad Rzeszutek Wilk [Wed, 20 Apr 2011 15:50:43 +0000 (11:50 -0400)]
xen/blkback: Prefix exposed functions with xen_

And also shorten the name if it has blkback to blkbk.

This results in the symbol table (if compiled in the kernel)
to be much shorter, prettier,  and also easier to search for.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen-blkback: Inline some of the functions that were moved from vbd/interface.c
Konrad Rzeszutek Wilk [Wed, 20 Apr 2011 15:21:43 +0000 (11:21 -0400)]
xen-blkback: Inline some of the functions that were moved from vbd/interface.c

Shuffling code around.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen-blkback: Remove from the copyright notice the address.
Konrad Rzeszutek Wilk [Wed, 20 Apr 2011 15:01:47 +0000 (11:01 -0400)]
xen-blkback: Remove from the copyright notice the address.

There is no need for it, as the address is updated constatly
in the root of the Linux kernel.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Squash vbd.c,interface.c in blkback.c and xenbus.c respectivly.
Konrad Rzeszutek Wilk [Wed, 20 Apr 2011 14:57:29 +0000 (10:57 -0400)]
xen/blkback: Squash vbd.c,interface.c in blkback.c and xenbus.c respectivly.

Daniel Stodden suggested to eliminate vbd.c and interface.c, inlining the
critical bits where they belong, respectively.

Leaving only blkback.c for the data- and xenbus.c for the control path.

Suggested-by: Daniel Stodden <daniel.stodden@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move it from drivers/xen to drivers/block
Konrad Rzeszutek Wilk [Mon, 18 Apr 2011 18:24:23 +0000 (14:24 -0400)]
xen/blkback: Move it from drivers/xen to drivers/block

.. and modify the Makefile and Kconfig files appropriately.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoblock, xen/blkback: remove blk_[get|put]_queue calls.
Konrad Rzeszutek Wilk [Mon, 18 Apr 2011 18:17:49 +0000 (14:17 -0400)]
block, xen/blkback: remove blk_[get|put]_queue calls.

They were used to check if the queue does not have QUEUE_FLAG_DEAD
set. That is not necessary anymore as the 'submit_io' call
ends up doing that for us.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Get the 'requeust_queue' properly.
Konrad Rzeszutek Wilk [Mon, 18 Apr 2011 16:04:17 +0000 (12:04 -0400)]
xen/blkback: Get the 'requeust_queue' properly.

After the commit 0faa8cca883bbc6a0919e3c89128672659b75820
("    xen/blkback: remove per-queue plugging") we forgot
to retrieve the 'struct request_queue' from the block device.

This puts the functionality back in and fixes a NULL pointer
bug.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move the check for misaligned I/O once more.
Konrad Rzeszutek Wilk [Mon, 18 Apr 2011 15:34:55 +0000 (11:34 -0400)]
xen/blkback: Move the check for misaligned I/O once more.

The commit 976222e05ea5a9959ccf880d7a24efbf79b3c6cf

    xen/blkback: Move the check for misaligned I/O higher.

moved it a bit to high. The preq->vbdev was not set, so the
check for misaligned I/O would cause a NULL pointer derefence.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Change fast_flush_area to xen_blkbk_unmap, and tweak xen_blk_map_seg.
Konrad Rzeszutek Wilk [Fri, 15 Apr 2011 15:50:34 +0000 (11:50 -0400)]
xen/blkback: Change fast_flush_area to xen_blkbk_unmap, and tweak xen_blk_map_seg.

The previous name ('fast_flush_area') had nothing to do with what it
does right now. Changing the names so that the code dealing with
mapping pages in and out of the guest is called xen_blkbk_[map|unmap].

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move the check for misaligned I/O higher.
Konrad Rzeszutek Wilk [Fri, 15 Apr 2011 15:38:29 +0000 (11:38 -0400)]
xen/blkback: Move the check for misaligned I/O higher.

We move it up higher to be in same loop that actually computes
the sector number.

This way, all of the code that deals with verifying that the
request is correct is all done before we do any of the
page mapping, I/O submission, etc.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Shuffle code around (vbd_translate moved higher).
Konrad Rzeszutek Wilk [Fri, 15 Apr 2011 15:35:13 +0000 (11:35 -0400)]
xen/blkback: Shuffle code around (vbd_translate moved higher).

We take out the chunk of code dealing with mapping to the guest
of pages into the xen_blk_map_buf code. And we also move the
vbd_translate to be done much earlier.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Cleanup move the code a bit around.
Konrad Rzeszutek Wilk [Fri, 15 Apr 2011 14:58:05 +0000 (10:58 -0400)]
xen/blkback: Cleanup move the code a bit around.

Moving it so that the code that 'fast_flush_area' code is
close to the code that deals with it so that the reader
won't lose focus.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Seperate the bio allocation and the bio submission.
Konrad Rzeszutek Wilk [Fri, 15 Apr 2011 14:51:27 +0000 (10:51 -0400)]
xen/blkback: Seperate the bio allocation and the bio submission.

We seperate the bio allocation (bio_alloc) from the bio submission so
that the error paths are much easier, and also so that the bio
submission can be done in one tight loop. It also makes the
plug/unplug calls much much easier.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: remove per-queue plugging
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:58:19 +0000 (17:58 -0400)]
xen/blkback: remove per-queue plugging

commit 7eaceaccab5f40bbfda044629a6298616aeaed50 ("block: remove per-queue plugging")
added two new interfaces to plug and unplug: blk_start_plug
and blk_finish_plug. Lets use those.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix checkpatch warnings in blkback.c
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:42:07 +0000 (17:42 -0400)]
xen/blkback: Fix checkpatch warnings in blkback.c

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix checkpatch warnings of xenbus.c
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:33:30 +0000 (17:33 -0400)]
xen/blkback: Fix checkpatch warnings of xenbus.c

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix interface.c checkpatch warnings .. except
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:27:29 +0000 (17:27 -0400)]
xen/blkback: Fix interface.c checkpatch warnings .. except

+               sring_x86_64 = (struct blkif_x86_64_sring *)blkif->blk_ring_area->addr;

WARNING: line over 80 characters
+               BACK_RING_INIT(&blkif->blk_rings.x86_64, sring_x86_64, PAGE_SIZE);

as breaking them up really does not help that much.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix checkpatch warnings in vbd.c
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:24:45 +0000 (17:24 -0400)]
xen/blkback: Fix checkpatch warnings in vbd.c

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: blkif->struct blkif_st
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:21:50 +0000 (17:21 -0400)]
xen/blkback: blkif->struct blkif_st

checkpatch.pl suggested that we don't use the typdef in common.h
and this triggered this avalanche of patches.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Add some comments.
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 21:05:23 +0000 (17:05 -0400)]
xen/blkback: Add some comments.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Fix the WRITE_BARRIER
Tom Goetz [Thu, 17 Mar 2011 16:14:29 +0000 (12:14 -0400)]
xen/blkback: Fix the WRITE_BARRIER

The WRITE_BARRIER was missing the REQ_WRITE option. This
was causing the blktap to die.

Signed-off-by: Tom Goetz <tom.goetz@virtualcomputer.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Use kzalloc's, and GFP_KERNEL for data structures.
Konrad Rzeszutek Wilk [Mon, 14 Mar 2011 16:41:26 +0000 (12:41 -0400)]
xen/blkback: Use kzalloc's, and GFP_KERNEL for data structures.

The patch titled:"xen/blkback: Use 'vzalloc' for page arrays and pre-allocate pages."
allocates the structures and its member variables using the 'vzalloc'.

Daniel Stodden pointed out that vzalloc is good when we use
big number of pages - while these are at the max two pages.

We can do this using kzalloc. Also the GFP_HIGHMEM does not
work properly with Xen, so take that out.

We will have to revisit this when a "get_empty_pages_and_pagevec"
type API shows up to leverage that.

BugLink: http://mid.gmane.org/1299898639.11681.227.camel@agari.van.xensource.com
CC: Daniel Stodden <daniel.stodden@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Utilize the M2P override mechanism for GNTMAP_host_map
Konrad Rzeszutek Wilk [Tue, 1 Mar 2011 21:46:45 +0000 (16:46 -0500)]
xen/blkback: Utilize the M2P override mechanism for GNTMAP_host_map

Instead of doing copy grants lets do mapping grants using
the M2P(and P2M) override mechanism.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Conflicts:

drivers/xen/blkback/blkback.c

13 years agoxen/blkback: Use 'vzalloc' for page arrays and pre-allocate pages.
Konrad Rzeszutek Wilk [Tue, 1 Mar 2011 21:26:10 +0000 (16:26 -0500)]
xen/blkback: Use 'vzalloc' for page arrays and pre-allocate pages.

Previously we would allocate the array for page using 'kmalloc' which
we can as easily do with 'vzalloc'. The pre-allocation of pages
was done a bit differently in the past - it used to be that
the balloon driver would export "alloc_empty_pages_and_pagevec"
which would have in one function created an array, allocated
the pages, balloned the pages out (so the memory behind those
pages would be non-present), and provide us those pages.

This was OK as those pages were shared between other guest and
the only thing we needed was to "swizzel" the MFN of those pages
to point to the other guest MFN. We can still "swizzel" the MFNs
using the M2P (and P2M) override API calls, but for the sake of
simplicity we are dropping the balloon API calls. We can return
to those later on.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Union the blkif_request request specific fields
Konrad Rzeszutek Wilk [Tue, 1 Mar 2011 21:22:28 +0000 (16:22 -0500)]
xen/blkback: Union the blkif_request request specific fields

Following in the steps of patch:
"xen: Union the blkif_request request specific fields" this patch
changes the blkback. Per the original patch:

"Prepare for extending the block device ring to allow request
specific fields, by moving the request specific fields for
reads, writes and barrier requests to a union member."

Cc: Owen Smith <owen.smith@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Move global/static variables into struct xen_blkbk.
Konrad Rzeszutek Wilk [Fri, 25 Feb 2011 15:51:29 +0000 (10:51 -0500)]
xen/blkback: Move global/static variables into struct xen_blkbk.

Bundle the lot of discrete variables into a single structure.
This is based on what was done in the xen-netback driver:
xen: netback: Move global/static variables into struct xen_netbk.
(094944631cc5a9d6e623302c987f78117c0bf7ac)

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: simplify address translations
Jan Beulich [Fri, 5 Feb 2010 19:19:33 +0000 (14:19 -0500)]
xen/blkback: simplify address translations

Cherry-pick and modified from 69d64727c42eecd47fdf82c15a54474d21a4012a
("blkback/blktap2: simplify address translations"):

"There are quite a number of places where e.g. page->va->page
translations happen.

Besides yielding smaller code (source and binary), a second goal is to
make it easier to determine where virtual addresses of pages allocated
through alloc_empty_pages_and_pagevec() are really used (in turn in
order to determine whether using highmem pages would be possible
there)."

The second goal is not the purpose of this patch - it is just to
make it easier to read the code.

linux-2.6-pvops:
 * Stripped drivers/xen/gntdev/*
 * Stripped drivers/xen/netback/*

[v2: Stripped blktap off]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13 years agoxen/blkback: Update to use blkdev_get_by_dev instead of open_by_devnum.
Konrad Rzeszutek Wilk [Fri, 25 Feb 2011 15:02:39 +0000 (10:02 -0500)]
xen/blkback: Update to use blkdev_get_by_dev instead of open_by_devnum.

The API for opening a block device has changed since 2.6.32. The
correct function to open a device is blkdev_get_by_dev.

13 years agoxen/blkback: Replace WRITE_BARRIER with (REQ_FLUSH | REQ_FUA)
Konrad Rzeszutek Wilk [Thu, 24 Feb 2011 22:22:41 +0000 (17:22 -0500)]
xen/blkback: Replace WRITE_BARRIER with (REQ_FLUSH | REQ_FUA)

TODO: Double check xen-blkfront.c

13 years agoblkback: Fix CVE-2010-3699
Keir Fraser [Thu, 25 Nov 2010 06:08:20 +0000 (22:08 -0800)]
blkback: Fix CVE-2010-3699

A guest can cause the backend driver to leak a kernel thread. Such
leaked threads hold references to the device, whichmakes the device
impossible to tear down. If shut down, the guest remains a zombie
domain, the xenwatch process hangs, and most xm commands will stop
working.

This patch tries to do the following for blkback:
    - identify/extract idempotent teardown operations,
    - add/move the invocation of said teardown operation
      right before we're about to allocate new resources in the
      Connected states.

[ linux-2.6.18-xen.hg 59f097ef181b ]

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Keir Fraser <keir@xen.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: Print additional information when a vbd is resized.
K. Y. Srinivasan [Mon, 16 Aug 2010 20:43:06 +0000 (13:43 -0700)]
xen/blkback: Print additional information when a vbd is resized.

Signed-off-by: K. Y. Srinivasan <ksrinivasan@novell.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: Flush blkback data when connecting.
Chris Lalancette [Wed, 21 Jul 2010 19:41:45 +0000 (12:41 -0700)]
xen/blkback: Flush blkback data when connecting.

First cut at flushing blkback data when first connecting
blkback.  This should avoid the pygrub issues we are experiencing
in (RedHat bugzilla) 466681.

[ 2.6.18-xen.hg commit 63b4d7f56688 ]

Signed-off-by: Chris Lalancette <clalance@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: add accessor for xenbus backend device
Jeremy Fitzhardinge [Thu, 18 Mar 2010 22:35:05 +0000 (15:35 -0700)]
xen/blkback: add accessor for xenbus backend device

Since backend_info is hidden away now.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: Propagate changed size of VBDs
K. Y. Srinivasan [Thu, 11 Mar 2010 21:39:50 +0000 (13:39 -0800)]
xen/blkback: Propagate changed size of VBDs

Support dynamic resizing of virtual block devices. This patch supports
both file backed block devices as well as physical devices that can be
dynamically resized on the host side.

Signed-off-by: K. Y. Srinivasan <ksrinivasan@novell.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: use drv_get/set_drvdata rather than directly accessing driver_data.
Jeremy Fitzhardinge [Fri, 12 Feb 2010 00:07:31 +0000 (16:07 -0800)]
xen/blkback: use drv_get/set_drvdata rather than directly accessing driver_data.

Direct driver_data access is obsolete and will disappear.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen: rename blkbk module xen-blkback.
Ian Campbell [Thu, 3 Dec 2009 21:56:18 +0000 (21:56 +0000)]
xen: rename blkbk module xen-blkback.

blkbk is rather generic for a modular distro style kernel.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoFix compile warnings: ignoring return value of 'xenbus_register_backend' ..
Konrad Rzeszutek Wilk [Thu, 8 Oct 2009 17:23:09 +0000 (13:23 -0400)]
Fix compile warnings: ignoring return value of 'xenbus_register_backend' ..

We neglect to check the return value of xenbus_register_backend
and take actions when that fails. This patch fixes that and adds
code to deal with those type of failures.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: little cleanups
Jeremy Fitzhardinge [Tue, 15 Sep 2009 21:12:37 +0000 (14:12 -0700)]
xen/blkback: little cleanups

Remove unused local prototype; group headers.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: remove spurious debug output noise
Jeremy Fitzhardinge [Wed, 9 Sep 2009 22:15:16 +0000 (15:15 -0700)]
xen/blkback: remove spurious debug output noise

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoxen/blkback: deal with hardsect_size to logical_block_size rename
Jeremy Fitzhardinge [Mon, 29 Jun 2009 21:58:45 +0000 (14:58 -0700)]
xen/blkback: deal with hardsect_size to logical_block_size rename

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoblock: export blk_get/put_queue for blkback
Jeremy Fitzhardinge [Sun, 22 Mar 2009 06:34:19 +0000 (23:34 -0700)]
block: export blk_get/put_queue for blkback

Impact: build fix

I'm not sure if blkback should be using these functions, but in the
meantime export them to allow blkback to be a module.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
13 years agoblkback: Fix potential resource leak.
Keir Fraser [Fri, 6 Mar 2009 08:29:15 +0000 (08:29 +0000)]
blkback: Fix potential resource leak.

13 years agoxen/blkback: don't include xen/evtchn.h
Jeremy Fitzhardinge [Tue, 10 Feb 2009 00:39:58 +0000 (16:39 -0800)]
xen/blkback: don't include xen/evtchn.h

It's a user-mode header for users of /dev/evtchn

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
13 years agoxen-blkback-porting
Jeremy Fitzhardinge [Mon, 9 Feb 2009 20:05:51 +0000 (12:05 -0800)]
xen-blkback-porting

13 years agoxen: add blkback support
Konrad Rzeszutek Wilk [Thu, 14 Apr 2011 22:25:47 +0000 (18:25 -0400)]
xen: add blkback support

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Conflicts:

drivers/xen/Makefile

13 years agoLinux 2.6.39-rc3
Linus Torvalds [Tue, 12 Apr 2011 00:21:51 +0000 (17:21 -0700)]
Linux 2.6.39-rc3

13 years agoMerge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
Linus Torvalds [Mon, 11 Apr 2011 22:48:57 +0000 (15:48 -0700)]
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: use proper interfaces for on-stack plugging
  xfs: fix xfs_debug warnings
  xfs: fix variable set but not used warnings
  xfs: convert log tail checking to a warning
  xfs: catch bad block numbers freeing extents.
  xfs: push the AIL from memory reclaim and periodic sync
  xfs: clean up code layout in xfs_trans_ail.c
  xfs: convert the xfsaild threads to a workqueue
  xfs: introduce background inode reclaim work
  xfs: convert ENOSPC inode flushing to use new syncd workqueue
  xfs: introduce a xfssyncd workqueue
  xfs: fix extent format buffer allocation size
  xfs: fix unreferenced var error in xfs_buf.c

Also, applied patch from Tony Luck that fixes ia64:
  xfs_destroy_workqueues() should not be tagged with__exit
in the branch before merging.

13 years agoxfs_destroy_workqueues() should not be tagged with__exit
Luck, Tony [Mon, 11 Apr 2011 19:06:12 +0000 (12:06 -0700)]
xfs_destroy_workqueues() should not be tagged with__exit

ia64 throws away .exit sections for the built-in CONFIG case, so routines
that are used in other circumstances should not be tagged as __exit.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agoMerge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Linus Torvalds [Mon, 11 Apr 2011 22:45:47 +0000 (15:45 -0700)]
Merge branch 'for_linus' of git://git./linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix data corruption regression by reverting commit 6de9843dab3f
  ext4: Allow indirect-block file to grow the file size to max file size
  ext4: allow an active handle to be started when freezing
  ext4: sync the directory inode in ext4_sync_parent()
  ext4: init timer earlier to avoid a kernel panic in __save_error_info
  jbd2: fix potential memory leak on transaction commit
  ext4: fix a double free in ext4_register_li_request
  ext4: fix credits computing for indirect mapped files
  ext4: remove unnecessary [cm]time update of quota file
  jbd2: move bdget out of critical section

13 years agoMerge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
Linus Torvalds [Mon, 11 Apr 2011 22:45:17 +0000 (15:45 -0700)]
Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux

* 'for-2.6.39' of git://linux-nfs.org/~bfields/linux:
  nfsd4: fix oops on lock failure
  nfsd: fix auth_domain reference leak on nlm operations

13 years agoMerge branch 'spi/merge' of git://git.secretlab.ca/git/linux-2.6
Linus Torvalds [Mon, 11 Apr 2011 22:44:38 +0000 (15:44 -0700)]
Merge branch 'spi/merge' of git://git.secretlab.ca/git/linux-2.6

* 'spi/merge' of git://git.secretlab.ca/git/linux-2.6:
  dt/fsldma: fix build warning caused by of_platform_device changes
  spi: Fix race condition in stop_queue()
  gpio/pch_gpio: Fix output value of pch_gpio_direction_output()
  gpio/ml_ioh_gpio: Fix output value of ioh_gpio_direction_output()
  gpio/pca953x: fix error handling path in probe() call

13 years agopci: fix PCI bus allocation alignment handling
Linus Torvalds [Mon, 11 Apr 2011 17:53:11 +0000 (10:53 -0700)]
pci: fix PCI bus allocation alignment handling

In commit 13583b16592a ("PCI: refactor io size calculation code") Ram
had a thinko in the refactorization of the code: the end result used the
variable 'align' for the bus alignment, but the original code used
'min_align'.

Since then, another use of that 'align' variable got introduced by
commit c8adf9a3e873 ("PCI: pre-allocate additional resources to devices
only after successful allocation of essential resources.")

Fix both of those uses to use 'min_align' as they should.

Daniel Hellstrom <daniel@gaisler.com>
Acked-by: Ram Pai <linuxram@us.ibm.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
Linus Torvalds [Mon, 11 Apr 2011 14:27:24 +0000 (07:27 -0700)]
Merge git://git./linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (34 commits)
  net: Add support for SMSC LAN9530, LAN9730 and LAN89530
  mlx4_en: Restoring RX buffer pointer in case of failure
  mlx4: Sensing link type at device initialization
  ipv4: Fix "Set rt->rt_iif more sanely on output routes."
  MAINTAINERS: add entry for Xen network backend
  be2net: Fix suspend/resume operation
  be2net: Rename some struct members for clarity
  pppoe: drop PPPOX_ZOMBIEs in pppoe_flush_dev
  dsa/mv88e6131: add support for mv88e6085 switch
  ipv6: Enable RFS sk_rxhash tracking for ipv6 sockets (v2)
  be2net: Fix a potential crash during shutdown.
  bna: Fix for handling firmware heartbeat failure
  can: mcp251x: Allow pass IRQ flags through platform data.
  smsc911x: fix mac_lock acquision before calling smsc911x_mac_read
  iwlwifi: accept EEPROM version 0x423 for iwl6000
  rt2x00: fix cancelling uninitialized work
  rtlwifi: Fix some warnings/bugs
  p54usb: IDs for two new devices
  wl12xx: fix potential buffer overflow in testmode nvs push
  zd1211rw: reset rx idle timer from tasklet
  ...

13 years agodt/fsldma: fix build warning caused by of_platform_device changes
Ira W. Snyder [Thu, 7 Apr 2011 17:33:03 +0000 (10:33 -0700)]
dt/fsldma: fix build warning caused by of_platform_device changes

Commit 000061245a6797d542854106463b6b20fbdcb12e, "dt/powerpc:
Eliminate users of of_platform_{,un}register_driver" forgot to convert
the type of structure passed into platform_device_register() when it
was converted from of_platform_device_register. Fix it.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
13 years agoext4: fix data corruption regression by reverting commit 6de9843dab3f
Theodore Ts'o [Mon, 11 Apr 2011 02:30:07 +0000 (22:30 -0400)]
ext4: fix data corruption regression by reverting commit 6de9843dab3f

Revert commit 6de9843dab3f2a1d4d66d80aa9e5782f80977d20, since it
caused a data corruption regression with BitTorrent downloads.  Thanks
to Damien for discovering and bisecting to find the problem commit.

https://bugzilla.kernel.org/show_bug.cgi?id=32972

Reported-by: Damien Grassart <damien@grassart.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
13 years agoext4: Allow indirect-block file to grow the file size to max file size
Kazuya Mio [Mon, 11 Apr 2011 02:06:36 +0000 (22:06 -0400)]
ext4: Allow indirect-block file to grow the file size to max file size

We can create 4402345721856 byte file with indirect block mapping.
However, if we grow an indirect-block file to the size with ftruncate(),
we can see an ext4 warning. The following patch fixes this problem.

How to reproduce:
# dd if=/dev/zero of=/mnt/mp1/hoge bs=1 count=0 seek=4402345721856
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000221428 s, 0.0 kB/s
# tail -n 1 /var/log/messages
Nov 25 15:10:27 test kernel: EXT4-fs warning (device sda8): ext4_block_to_path:345: block 1074791436 > max in inode 12

Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
13 years agoext4: allow an active handle to be started when freezing
Yongqiang Yang [Mon, 11 Apr 2011 02:06:07 +0000 (22:06 -0400)]
ext4: allow an active handle to be started when freezing

ext4_journal_start_sb() should not prevent an active handle from being
started due to s_frozen.  Otherwise, deadlock is easy to happen, below
is a situation.

================================================
     freeze         |       truncate
================================================
                    |  ext4_ext_truncate()
    freeze_super()  |   starts a handle
    sets s_frozen   |
                    |  ext4_ext_truncate()
                    |  holds i_data_sem
  ext4_freeze()     |
  waits for updates |
                    |  ext4_free_blocks()
                    |  calls dquot_free_block()
                    |
                    |  dquot_free_blocks()
                    |  calls ext4_dirty_inode()
                    |
                    |  ext4_dirty_inode()
                    |  trys to start an active
                    |  handle
                    |
                    |  block due to s_frozen
================================================

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Amir Goldstein <amir73il@users.sf.net>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
13 years agoext4: sync the directory inode in ext4_sync_parent()
Curt Wohlgemuth [Mon, 11 Apr 2011 02:05:31 +0000 (22:05 -0400)]
ext4: sync the directory inode in ext4_sync_parent()

ext4 has taken the stance that, in the absence of a journal,
when an fsync/fdatasync of an inode is done, the parent
directory should be sync'ed if this inode entry is new.
ext4_sync_parent(), which implements this, does indeed sync
the dirent pages for parent directories, but it does not
sync the directory *inode*.  This patch fixes this.

Also now return error status from ext4_sync_parent().

I tested this using a power fail test, which panics a
machine running a file server getting requests from a
client.  Without this patch, on about every other test run,
the server is missing many, many files that had been synced.
With this patch, on > 6 runs, I see zero files being lost.

Google-Bug-Id: 4179519
Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
13 years agonet: Add support for SMSC LAN9530, LAN9730 and LAN89530
Steve Glendinning [Mon, 11 Apr 2011 01:59:27 +0000 (18:59 -0700)]
net: Add support for SMSC LAN9530, LAN9730 and LAN89530

This patch adds support for SMSC's LAN9530, LAN9730 and LAN89530 USB
ethernet controllers to the existing smsc95xx driver by adding
their new USB VID/PID pairs.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
13 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
Linus Torvalds [Sun, 10 Apr 2011 16:56:10 +0000 (09:56 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/tiwai/sound-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  ALSA: hda - Don't query connections for widgets have no connections
  ALSA: HDA: Fix single internal mic on ALC275 (Sony Vaio VPCSB1C5E)
  ALSA: hda - HDMI: Fix MCP7x audio infoframe checksums
  ALSA: usb-audio: define another USB ID for a buggy USB MIDI cable
  ALSA: HDA: Fix dock mic for Lenovo X220-tablet
  ASoC: format_register_str: Don't clip register values
  ASoC: PXA: Fix oops in __pxa2xx_pcm_prepare
  ASoC: zylonite: set .codec_dai_name in initializer

13 years agonfsd4: fix oops on lock failure
J. Bruce Fields [Mon, 28 Mar 2011 07:15:09 +0000 (15:15 +0800)]
nfsd4: fix oops on lock failure

Lock stateid's can have access_bmap 0 if they were only partially
initialized (due to a failed lock request); handle that case in
free_generic_stateid.

------------[ cut here ]------------
kernel BUG at fs/nfsd/nfs4state.c:380!
invalid opcode: 0000 [#1] SMP
last sysfs file: /sys/kernel/mm/ksm/run
Modules linked in: nfs fscache md4 nls_utf8 cifs ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat bridge stp llc nfsd lockd nfs_acl auth_rpcgss sunrpc ipv6 ppdev parport_pc parport pcnet32 mii pcspkr microcode i2c_piix4 BusLogic floppy [last unloaded: mperf]

Pid: 1468, comm: nfsd Not tainted 2.6.38+ #120 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
EIP: 0060:[<e24f180d>] EFLAGS: 00010297 CPU: 0
EIP is at nfs4_access_to_omode+0x1c/0x29 [nfsd]
EAX: ffffffff EBX: dd758120 ECX: 00000000 EDX: 00000004
ESI: dd758120 EDI: ddfe657c EBP: dd54dde0 ESP: dd54dde0
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process nfsd (pid: 1468, ti=dd54c000 task=ddc92580 task.ti=dd54c000)
Stack:
 dd54ddf0 e24f19ca 00000000 ddfe6560 dd54de08 e24f1a5d dd758130 deee3a20
 ddfe6560 31270000 dd54df1c e24f52fd 0000000f dd758090 e2505dd0 0be304cf
 dbb51d68 0000000e ddfe657c ddcd8020 dd758130 dd758128 dd7580d8 dd54de68
Call Trace:
 [<e24f19ca>] free_generic_stateid+0x1c/0x3e [nfsd]
 [<e24f1a5d>] release_lockowner+0x71/0x8a [nfsd]
 [<e24f52fd>] nfsd4_lock+0x617/0x66c [nfsd]
 [<e24e57b6>] ? nfsd_setuser+0x199/0x1bb [nfsd]
 [<e24e056c>] ? nfsd_setuser_and_check_port+0x65/0x81 [nfsd]
 [<c07a0052>] ? _cond_resched+0x8/0x1c
 [<c04ca61f>] ? slab_pre_alloc_hook.clone.33+0x23/0x27
 [<c04cac01>] ? kmem_cache_alloc+0x1a/0xd2
 [<c04835a0>] ? __call_rcu+0xd7/0xdd
 [<e24e0dfb>] ? fh_verify+0x401/0x452 [nfsd]
 [<e24f0b61>] ? nfsd4_encode_operation+0x52/0x117 [nfsd]
 [<e24ea0d7>] ? nfsd4_putfh+0x33/0x3b [nfsd]
 [<e24f4ce6>] ? nfsd4_delegreturn+0xd4/0xd4 [nfsd]
 [<e24ea2c9>] nfsd4_proc_compound+0x1ea/0x33e [nfsd]
 [<e24de6ee>] nfsd_dispatch+0xd1/0x1a5 [nfsd]
 [<e1d6e1c7>] svc_process_common+0x282/0x46f [sunrpc]
 [<e1d6e578>] svc_process+0xdc/0xfa [sunrpc]
 [<e24de0fa>] nfsd+0xd6/0x115 [nfsd]
 [<e24de024>] ? nfsd_shutdown+0x24/0x24 [nfsd]
 [<c0454322>] kthread+0x62/0x67
 [<c04542c0>] ? kthread_worker_fn+0x114/0x114
 [<c07a6ebe>] kernel_thread_helper+0x6/0x10
Code: eb 05 b8 00 00 27 4f 8d 65 f4 5b 5e 5f 5d c3 83 e0 03 55 83 f8 02 89 e5 74 17 83 f8 03 74 05 48 75 09 eb 09 b8 02 00 00 00 eb 0b <0f> 0b 31 c0 eb 05 b8 01 00 00 00 5d c3 55 89 e5 57 56 89 d6 8d
EIP: [<e24f180d>] nfs4_access_to_omode+0x1c/0x29 [nfsd] SS:ESP 0068:dd54dde0
---[ end trace 2b0bf6c6557cb284 ]---

The trace route is:

 -> nfsd4_lock()
   -> if (lock->lk_is_new) {
     -> alloc_init_lock_stateid()

        3739: stp->st_access_bmap = 0;

   ->if (status && lock->lk_is_new && lock_sop)
     -> release_lockowner()
      -> free_generic_stateid()
       -> nfs4_access_bmap_to_omode()
          -> nfs4_access_to_omode()

        380: BUG();   *****

This problem was introduced by 0997b173609b9229ece28941c118a2a9b278796e.

Reported-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Tested-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
13 years agoMerge git://git.infradead.org/mtd-2.6
Linus Torvalds [Sat, 9 Apr 2011 20:23:50 +0000 (13:23 -0700)]
Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6:
  mtd: atmel_nand: use CPU I/O when buffer is in vmalloc(ed) region
  mtd: atmel_nand: modify test case for using DMA operations
  mtd: atmel_nand: fix support for CPUs that do not support DMA access
  mtd: atmel_nand: trivial: change DMA usage information trace
  mtd: mtdswap: fix printk format warning

13 years agoMerge branch 'fix/hda' into for-linus
Takashi Iwai [Sat, 9 Apr 2011 08:05:53 +0000 (10:05 +0200)]
Merge branch 'fix/hda' into for-linus

13 years agoMerge branch 'fix/asoc' into for-linus
Takashi Iwai [Sat, 9 Apr 2011 08:05:30 +0000 (10:05 +0200)]
Merge branch 'fix/asoc' into for-linus

13 years agoMerge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
Linus Torvalds [Fri, 8 Apr 2011 18:47:35 +0000 (11:47 -0700)]
Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: Change initial mount authflavor only when server returns NFS4ERR_WRONGSEC
  NFS: Fix a signed vs. unsigned secinfo bug
  Revert "net/sunrpc: Use static const char arrays"

13 years agosignal.c: fix erroneous syscall kernel-doc
Randy Dunlap [Fri, 8 Apr 2011 17:53:46 +0000 (10:53 -0700)]
signal.c: fix erroneous syscall kernel-doc

Fix erroneous syscall kernel-doc comments in kernel/signal.c.

Reported-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agoMerge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
Linus Torvalds [Fri, 8 Apr 2011 14:36:14 +0000 (07:36 -0700)]
Merge branch 'for-linus' of git://git390.marist.edu/linux-2.6

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] compile fix for latest binutils
  [S390] cio: prevent purging of CCW devices in the online state
  [S390] qdio: fix init sequence
  [S390] Fix parameter passing for smp_switch_to_cpu()
  [S390] oprofile s390: prevent stack corruption

13 years agoMerge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
Linus Torvalds [Fri, 8 Apr 2011 14:35:17 +0000 (07:35 -0700)]
Merge branch 'for_linus' of git://git./linux/kernel/git/jack/linux-fs-2.6

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6:
  quota: Don't write quota info in dquot_commit()
  ext3: Fix writepage credits computation for ordered mode

13 years agoxfs: use proper interfaces for on-stack plugging
Christoph Hellwig [Wed, 30 Mar 2011 11:05:09 +0000 (11:05 +0000)]
xfs: use proper interfaces for on-stack plugging

Add proper blk_start_plug/blk_finish_plug pairs for the two places where
we issue buffer I/O, and remove the blk_flush_plug in xfs_buf_lock and
xfs_buf_iowait, given that context switches already flush the per-process
plugging lists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
13 years agoxfs: fix xfs_debug warnings
Christoph Hellwig [Sat, 2 Apr 2011 18:13:40 +0000 (18:13 +0000)]
xfs: fix xfs_debug warnings

For a CONFIG_XFS_DEBUG=n build gcc complains about statements with no
effect in xfs_debug:

fs/xfs/quota/xfs_qm_syscalls.c: In function 'xfs_qm_scall_trunc_qfiles':
fs/xfs/quota/xfs_qm_syscalls.c:291:3: warning: statement with no effect

The reason for that is that the various new xfs message functions have a
return value which is never used, and in case of the non-debug build
xfs_debug the macro evaluates to a plain 0 which produces the above
warnings.  This can be fixed by turning xfs_debug into an inline function
instead of a macro, but in addition to that I've also changed all the
message helpers to return void as we never use their return values.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
13 years agoxfs: fix variable set but not used warnings
Christoph Hellwig [Mon, 4 Apr 2011 12:55:44 +0000 (12:55 +0000)]
xfs: fix variable set but not used warnings

GCC 4.6 now warnings about variables set but not used.  Fix the trivially
fixable warnings of this sort.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
13 years agomlx4_en: Restoring RX buffer pointer in case of failure
Yevgeny Petrilin [Wed, 6 Apr 2011 23:25:45 +0000 (23:25 +0000)]
mlx4_en: Restoring RX buffer pointer in case of failure

If not done, second attempt to open the RX ring would cause memory corruption.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
13 years agomlx4: Sensing link type at device initialization
Yevgeny Petrilin [Wed, 6 Apr 2011 23:24:42 +0000 (23:24 +0000)]
mlx4: Sensing link type at device initialization

When bringing the port up, performing a SENSE_PORT command
To try and check to which physical link type (IB or Ethernet) the physical
port is connected.
In case there is no valid link partner, the port will come up as its
supported default.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
13 years agoxfs: convert log tail checking to a warning
Dave Chinner [Fri, 8 Apr 2011 02:45:07 +0000 (12:45 +1000)]
xfs: convert log tail checking to a warning

On the Power platform, the log tail debug checks fire excessively
causing the system to panic early in testing. The debug checks are
known to be racy, though on x86_64 there is no evidence that they
trigger at all.

We want to keep the checks active on debug systems to alert us to
problems with log space accounting, but we need to reduce the impact
of a racy check on testing on the Power platform.

As a result, convert the ASSERT conditions to warnings, and
allow them to fire only once per filesystem mount. This will prevent
false positives from interfering with testing, whilst still
providing us with the indication that they may be a problem with log
space accounting should that occur.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>