To better reflect that the cmd_timeout_ms is directly related to the
busy detection timeout, let's rename it.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Rename host->max_discard_to to host->max_busy_timeout, to reflect that
it tells the mmc core layer about the maximum supported busy detection
timeout by the host.
This timeout is at the moment only applicable to erase/trim/discard
commands. By the renaming we provide the option of make use of it for
other commands that cares about busy detection. In other words, those
commands that wants an R1B response, like for example the mmc switch
command.
Do note that the max_busy_timeout is supposed to be specified only by
hosts supporting MMC_CAP_WAIT_WHILE_BUSY.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Put myself as a (co)maintainer of the mmc subsystem to help out Chris
Ball in a more official role.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Provide the option to configure these speed modes per host, for those
host driver's that can't distinguish this in runtime.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Provide the option to configure these speed modes per host, for those
host driver's that can't distinguish this in runtime.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>
Provide the option to configure these speed modes per host, for those
host driver's that can't distinguish this in runtime.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>
The new phase searching method is more concise and easier to
understand.
Signed-off-by: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Chris Ball <chris@printf.net>
If the host driver removed while card in the slot, the host will not
power off card power correctly. This bug is produced because host
eject flag set before the last mmc_set_ios callback, we should set the
eject flag after power off.
Signed-off-by: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Chris Ball <chris@printf.net>
Add support for realtek rts5250 pci card reader. The card reader has
some problems with DDR50 mode, so add a new quirks2 for broken ddr50.
Signed-off-by: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Chris Ball <chris@printf.net>
This patch adds the erase capability to OMAP1/OMAP2420 MMC driver. Idea is
the same than in commit 93caf8e ("omap_hsmmc: add erase capability") that we
disable the data timeout interrupt for erases.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
Because use_dma is set only in mmc_omap_probe and unset nowhere there is no
need to carry that flag in struct mmc_omap_host for mmc_omap_prepare_data
function.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
Simplify probe and cleanup code by using devm_ioremap_resource. This also
makes probe code to follow more common allocate private struct followed by
other initialization style.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
Field mem_res in struct mmc_omap_host is used only once in mmc_omap_probe
when setting the phys_base field so we may just se the phys_base straight
and remove needless mem_res.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
host-irq is set twice so remove needless one.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
Omap MMC driver initialization can cause a NULL pointer dereference in
tasklet_hi_action on Nokia N810 if its miniSD cover is open during driver
initialization.
[ 1.070000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 1.080000] pgd = c0004000
[ 1.080000] [00000000] *pgd=00000000
[ 1.080000] Internal error: Oops: 80000005 [#1] PREEMPT ARM
[ 1.080000] Modules linked in:
[ 1.080000] CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 3.13.0-rc2+ #95
[ 1.080000] Workqueue: events menelaus_work
[ 1.080000] task: c7863340 ti: c7878000 task.ti: c7878000
[ 1.080000] PC is at 0x0
[ 1.080000] LR is at tasklet_hi_action+0x68/0xa4
...
[ 1.080000] [<c003543c>] (tasklet_hi_action+0x68/0xa4) from [<c0034dd0>] (__do_softirq+0xbc/0x208)
[ 1.080000] [<c0034dd0>] (__do_softirq+0xbc/0x208) from [<c003521c>] (irq_exit+0x84/0xac)
[ 1.080000] [<c003521c>] (irq_exit+0x84/0xac) from [<c00135cc>] (handle_IRQ+0x64/0x84)
[ 1.080000] [<c00135cc>] (handle_IRQ+0x64/0x84) from [<c000859c>] (omap2_intc_handle_irq+0x54/0x68)
[ 1.080000] [<c000859c>] (omap2_intc_handle_irq+0x54/0x68) from [<c0015be0>] (__irq_svc+0x40/0x74)
[ 1.080000] Exception stack(0xc7879d70 to 0xc7879db8)
[ 1.080000] 9d60: 000003f1 0000000a 00000009 0000001c
[ 1.080000] 9d80: c7879e70 c780bc10 c780bc10 00000000 00000001 00008603 c780bc78 c7879e4e
[ 1.080000] 9da0: 00000002 c7879db8 c00343b0 c0160c9c 20000113 ffffffff
[ 1.080000] [<c0015be0>] (__irq_svc+0x40/0x74) from [<c0160c9c>] (__aeabi_uidiv+0x20/0x9c)
[ 1.080000] [<c0160c9c>] (__aeabi_uidiv+0x20/0x9c) from [<c00343b0>] (msecs_to_jiffies+0x18/0x24)
[ 1.080000] [<c00343b0>] (msecs_to_jiffies+0x18/0x24) from [<c01ec3ec>] (omap_i2c_xfer+0x30c/0x458)
[ 1.080000] [<c01ec3ec>] (omap_i2c_xfer+0x30c/0x458) from [<c01e9724>] (__i2c_transfer+0x3c/0x74)
[ 1.080000] [<c01e9724>] (__i2c_transfer+0x3c/0x74) from [<c01eac4c>] (i2c_transfer+0x78/0x94)
[ 1.080000] [<c01eac4c>] (i2c_transfer+0x78/0x94) from [<c01eb0bc>] (i2c_smbus_xfer+0x3c0/0x4f8)
[ 1.080000] [<c01eb0bc>] (i2c_smbus_xfer+0x3c0/0x4f8) from [<c01eb414>] (i2c_smbus_write_byte_data+0x34/0x3c)
[ 1.080000] [<c01eb414>] (i2c_smbus_write_byte_data+0x34/0x3c) from [<c01bb308>] (menelaus_write_reg+0x1c/0x40)
[ 1.080000] [<c01bb308>] (menelaus_write_reg+0x1c/0x40) from [<c01bb904>] (menelaus_work+0xa0/0xc4)
[ 1.080000] [<c01bb904>] (menelaus_work+0xa0/0xc4) from [<c00439c4>] (process_one_work+0x1fc/0x334)
[ 1.080000] [<c00439c4>] (process_one_work+0x1fc/0x334) from [<c0043d6c>] (worker_thread+0x244/0x380)
[ 1.080000] [<c0043d6c>] (worker_thread+0x244/0x380) from [<c0049d04>] (kthread+0xc0/0xd4)
[ 1.080000] [<c0049d04>] (kthread+0xc0/0xd4) from [<c0012758>] (ret_from_fork+0x14/0x3c)
[ 1.080000] Code: bad PC value
[ 1.090000] ---[ end trace 7bc2fc7cd14f1d95 ]---
[ 1.100000] Kernel panic - not syncing: Fatal exception in interrupt
Reason for this is that omap_notify_cover_event which calls
tasklet_hi_schedule gets called before struct cover_tasklet is initialized.
Call to omap_notify_cover_event on Nokia N810 happens from menelaus.c PMIC
driver via board-n8x0.c during execution of mmc_add_host in case of open
miniSD cover.
Fix this by moving cover_timer and cover_tasklet initialization before
mmc_add_host call in mmc_omap_new_slot.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>
This patch adds DT support for r8a7791.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Chris Ball <chris@printf.net>
This patch updates r8a7790 DT data to have SoC specific settings.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Chris Ball <chris@printf.net>
This patch updates r8a7779 DT data to have SoC specific settings.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Chris Ball <chris@printf.net>
This patch updates r8a7778 DT data to have SoC specific settings.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Chris Ball <chris@printf.net>
It is easier to read if sh_mobile_sdhi_of_cfg and
sh_mobile_sdhi_of_match are closer.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Chris Ball <chris@printf.net>
There are no reason to why the use of a non-volatile internal eMMC
cache should be controlled by a host cap. Instead let's just enable it
if the eMMC card supports it.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>
Earlier we disabled the cache during suspend, which meant a flush was
internally at the eMMC performed as well.
To simplify code we can make use of the mmc_flush_cache(), during mmc
suspend, which makes the mmc_cache_ctrl() redundant so then we can
remove it.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>
There are no active users of this host capability. The primary reason
for adding this cap was due to a bug in ux500 boot loader code, which
is not a relevant issue any more. So, let's remove it.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
There is no need for keeping a host cap for MMC_CAP2_SANITIZE, instead
we just make the feature default available.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Due to the removal of the Kconfig option MMC_UNSAFE_RESUME, several
validations of a present bus_ops callback became redundant. Let's
remove these.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Invoking system suspend or shutdown without using the Kconfig option
MMC_UNSAFE_RESUME, did trigger an ungraceful power cut of the card.
To improve the situation, change the behavior to always make use of the
available bus_ops callbacks that handles system suspend and shutdown
properly.
By changing the behavior MMC_UNSAFE_RESUME becomes redundant, so lets's
remove it.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Since the users of the exported PM functions are now using the modern
PM ops macros, we can convert to the proper corresponding PM configs.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <chris@printf.net>
Pull SELinux fixes from James Morris.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
SELinux: Fix kernel BUG on empty security contexts.
selinux: add SOCK_DIAG_BY_FAMILY to the list of netlink message types
Pull vfs fixes from Al Viro:
"A couple of fixes, both -stable fodder. The O_SYNC bug is fairly
old..."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
fix a kmap leak in virtio_console
fix O_SYNC|O_APPEND syncing the wrong range on write()
While we are at it, don't do kmap() under kmap_atomic(), *especially*
for a page we'd allocated with GFP_KERNEL. It's spelled "page_address",
and had that been more than that, we'd have a real trouble - kmap_high()
can block, and doing that while holding kmap_atomic() is a Bad Idea(tm).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
It actually goes back to 2004 ([PATCH] Concurrent O_SYNC write support)
when sync_page_range() had been introduced; generic_file_write{,v}() correctly
synced
pos_after_write - written .. pos_after_write - 1
but generic_file_aio_write() synced
pos_before_write .. pos_before_write + written - 1
instead. Which is not the same thing with O_APPEND, obviously.
A couple of years later correct variant had been killed off when
everything switched to use of generic_file_aio_write().
All users of generic_file_aio_write() are affected, and the same bug
has been copied into other instances of ->aio_write().
The fix is trivial; the only subtle point is that generic_write_sync()
ought to be inlined to avoid calculations useless for the majority of
calls.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Pull btrfs fixes from Chris Mason:
"This is a small collection of fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
Btrfs: fix data corruption when reading/updating compressed extents
Btrfs: don't loop forever if we can't run because of the tree mod log
btrfs: reserve no transaction units in btrfs_ioctl_set_features
btrfs: commit transaction after setting label and features
Btrfs: fix assert screwup for the pending move stuff
Pull perf fixes from Ingo Molnar:
"Tooling fixes, mostly related to the KASLR fallout, but also other
fixes"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf buildid-cache: Check relocation when checking for existing kcore
perf tools: Adjust kallsyms for relocated kernel
perf tests: No need to set up ref_reloc_sym
perf symbols: Prevent the use of kcore if the kernel has moved
perf record: Get ref_reloc_sym from kernel map
perf machine: Set up ref_reloc_sym in machine__create_kernel_maps()
perf machine: Add machine__get_kallsyms_filename()
perf tools: Add kallsyms__get_function_start()
perf symbols: Fix symbol annotation for relocated kernel
perf tools: Fix include for non x86 architectures
perf tools: Fix AAAAARGH64 memory barriers
perf tools: Demangle kernel and kernel module symbols too
perf/doc: Remove mention of non-existent set_perf_event_pending() from design.txt
When using a mix of compressed file extents and prealloc extents, it
is possible to fill a page of a file with random, garbage data from
some unrelated previous use of the page, instead of a sequence of zeroes.
A simple sequence of steps to get into such case, taken from the test
case I made for xfstests, is:
_scratch_mkfs
_scratch_mount "-o compress-force=lzo"
$XFS_IO_PROG -f -c "pwrite -S 0x06 -b 18670 266978 18670" $SCRATCH_MNT/foobar
$XFS_IO_PROG -c "falloc 26450 665194" $SCRATCH_MNT/foobar
$XFS_IO_PROG -c "truncate 542872" $SCRATCH_MNT/foobar
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar
This results in the following file items in the fs tree:
item 4 key (257 INODE_ITEM 0) itemoff 15879 itemsize 160
inode generation 6 transid 6 size 542872 block group 0 mode 100600
item 5 key (257 INODE_REF 256) itemoff 15863 itemsize 16
inode ref index 2 namelen 6 name: foobar
item 6 key (257 EXTENT_DATA 0) itemoff 15810 itemsize 53
extent data disk byte 0 nr 0 gen 6
extent data offset 0 nr 24576 ram 266240
extent compression 0
item 7 key (257 EXTENT_DATA 24576) itemoff 15757 itemsize 53
prealloc data disk byte 12849152 nr 241664 gen 6
prealloc data offset 0 nr 241664
item 8 key (257 EXTENT_DATA 266240) itemoff 15704 itemsize 53
extent data disk byte 12845056 nr 4096 gen 6
extent data offset 0 nr 20480 ram 20480
extent compression 2
item 9 key (257 EXTENT_DATA 286720) itemoff 15651 itemsize 53
prealloc data disk byte 13090816 nr 405504 gen 6
prealloc data offset 0 nr 258048
The on disk extent at offset 266240 (which corresponds to 1 single disk block),
contains 5 compressed chunks of file data. Each of the first 4 compress 4096
bytes of file data, while the last one only compresses 3024 bytes of file data.
Therefore a read into the file region [285648 ; 286720[ (length = 4096 - 3024 =
1072 bytes) should always return zeroes (our next extent is a prealloc one).
The solution here is the compression code path to zero the remaining (untouched)
bytes of the last page it uncompressed data into, as the information about how
much space the file data consumes in the last page is not known in the upper layer
fs/btrfs/extent_io.c:__do_readpage(). In __do_readpage we were correctly zeroing
the remainder of the page but only if it corresponds to the last page of the inode
and if the inode's size is not a multiple of the page size.
This would cause not only returning random data on reads, but also permanently
storing random data when updating parts of the region that should be zeroed.
For the example above, it means updating a single byte in the region [285648 ; 286720[
would store that byte correctly but also store random data on disk.
A test case for xfstests follows soon.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
A user reported a 100% cpu hang with my new delayed ref code. Turns out I
forgot to increase the count check when we can't run a delayed ref because of
the tree mod log. If we can't run any delayed refs during this there is no
point in continuing to look, and we need to break out. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Added in patch "btrfs: add ioctls to query/change feature bits online"
modifications to superblock don't need to reserve metadata blocks when
starting a transaction.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
The set_fslabel ioctl uses btrfs_end_transaction, which means it's
possible that the change will be lost if the system crashes, same for
the newly set features. Let's use btrfs_commit_transaction instead.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Wang noticed that he was failing btrfs/030 even though me and Filipe couldn't
reproduce. Turns out this is because Wang didn't have CONFIG_BTRFS_ASSERT set,
which meant that a key part of Filipe's original patch was not being built in.
This appears to be a mess up with merging Filipe's patch as it does not exist in
his original patch. Fix this by changing how we make sure del_waiting_dir_move
asserts that it did not error and take the function out of the ifdef check.
This makes btrfs/030 pass with the assert on or off. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Filipe Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
- Protect pinctrl_list_add() with the proper mutex. This
was identified by RedHat. Caused nasty locking warnings
was rootcased by Stanislaw Gruszka.
- Avoid adding dangerous debugfs files when either half of
the subsystem is unused: pinmux or pinconf.
- Various fixes to various drivers: locking, hardware
particulars, DT parsing, error codes.
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Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pinctrl fixes from Linus Walleij:
"First round of pin control fixes for v3.14:
- Protect pinctrl_list_add() with the proper mutex. This was
identified by RedHat. Caused nasty locking warnings was rootcased
by Stanislaw Gruszka.
- Avoid adding dangerous debugfs files when either half of the
subsystem is unused: pinmux or pinconf.
- Various fixes to various drivers: locking, hardware particulars, DT
parsing, error codes"
* tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: tegra: return correct error type
pinctrl: do not init debugfs entries for unimplemented functionalities
pinctrl: protect pinctrl_list add
pinctrl: sirf: correct the pin index of ac97_pins group
pinctrl: imx27: fix offset calculation in imx_read_2bit
pinctrl: vt8500: Change devicetree data parsing
pinctrl: imx27: fix wrong offset to ICONFB
pinctrl: at91: use locked variant of irq_set_handler
Pull x86 fixes from Peter Anvin:
"Quite a varied little collection of fixes. Most of them are
relatively small or isolated; the biggest one is Mel Gorman's fixes
for TLB range flushing.
A couple of AMD-related fixes (including not crashing when given an
invalid microcode image) and fix a crash when compiled with gcov"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, microcode, AMD: Unify valid container checks
x86, hweight: Fix BUG when booting with CONFIG_GCOV_PROFILE_ALL=y
x86/efi: Allow mapping BGRT on x86-32
x86: Fix the initialization of physnode_map
x86, cpu hotplug: Fix stack frame warning in check_irq_vectors_for_cpu_disable()
x86/intel/mid: Fix X86_INTEL_MID dependencies
arch/x86/mm/srat: Skip NUMA_NO_NODE while parsing SLIT
mm, x86: Revisit tlb_flushall_shift tuning for page flushes except on IvyBridge
x86: mm: change tlb_flushall_shift for IvyBridge
x86/mm: Eliminate redundant page table walk during TLB range flushing
x86/mm: Clean up inconsistencies when flushing TLB ranges
mm, x86: Account for TLB flushes only when debugging
x86/AMD/NB: Fix amd_set_subcaches() parameter type
x86/quirks: Add workaround for AMD F16h Erratum792
x86, doc, kconfig: Fix dud URL for Microcode data
I missed a couple errors in reviewing the patches converting jfs
to use the generic posix ACL function. Setting ACL's currently
fails with -EOPNOTSUPP.
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Reported-by: Michael L. Semon <mlsemon35@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Ulf Hansson