block: Fix iterating over an empty bio with bio_for_each_folio_all

commit 7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7 upstream.

If the bio contains no data, bio_first_folio() calls page_folio() on a
N

block: Fix iterating over an empty bio with bio_for_each_folio_all

commit 7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7 upstream.

If the bio contains no data, bio_first_folio() calls page_folio() on a
NULL pointer and oopses. Move the test that we've reached the end of
the bio from bio_next_folio() to bio_first_folio().

Reported-by: syzbot+8b23309d5788a79d3eea@syzkaller.appspotmail.com
Reported-by: syzbot+004c1e0fced2b4bc3dcc@syzkaller.appspotmail.com
Fixes: 640d1930bef4 ("block: Add bio_for_each_folio_all()")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240116212959.3413014-1-willy@infradead.org
[axboe: add unlikely() to error case]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

show more ...

mm/page_io: introduce bio_first_folio_all()

Introduce bio_first_folio_all() to return a folio, which makes it easier
to use.

Link: https://lkml.kernel.org/r/20230721034451.16412-4-zhangpeng362@huaw

mm/page_io: introduce bio_first_folio_all()

Introduce bio_first_folio_all() to return a folio, which makes it easier
to use.

Link: https://lkml.kernel.org/r/20230721034451.16412-4-zhangpeng362@huawei.com
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

show more ...

block: Bring back zero_fill_bio_iter

This reverts 6f822e1b5d9dda3d20e87365de138046e3baa03a - this helper is
used by bcachefs.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Jens Axb

block: Bring back zero_fill_bio_iter

This reverts 6f822e1b5d9dda3d20e87365de138046e3baa03a - this helper is
used by bcachefs.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Link: https://lore.kernel.org/r/20230813182636.2966159-4-kent.overstreet@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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block: don't make REQ_POLLED imply REQ_NOWAIT

Normally these two flags do go together, as the issuer of polled IO
generally cannot wait for resources that will get freed as part of IO
completion. Th

block: don't make REQ_POLLED imply REQ_NOWAIT

Normally these two flags do go together, as the issuer of polled IO
generally cannot wait for resources that will get freed as part of IO
completion. This is because that very task is the one that will complete
the request and free those resources, hence that would introduce a
deadlock.

But it is possible to have someone else issue the polled IO, eg via
io_uring if the request is punted to io-wq. For that case, it's fine to
have the task block on IO submission, as it is not the same task that
will be completing the IO.

It's completely up to the caller to ask for both polled and nowait IO
separately! If we don't allow polled IO where IOCB_NOWAIT isn't set in
the kiocb, then we can run into repeated -EAGAIN submissions and not
make any progress.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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block: remove BIO_PAGE_REFFED

Now that all block direct I/O helpers use page pinning, this flag is
unused.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kern

block: remove BIO_PAGE_REFFED

Now that all block direct I/O helpers use page pinning, this flag is
unused.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20230614140341.521331-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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block: mark bio_add_folio as __must_check

Now that all callers of bio_add_folio() check the return value, mark it as
__must_check.

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-

block: mark bio_add_folio as __must_check

Now that all callers of bio_add_folio() check the return value, mark it as
__must_check.

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/381360a45ac3684120cfbe1e07685e9c36256e47.1685532726.git.johannes.thumshirn@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: add bio_add_folio_nofail

Just like for bio_add_pages() add a no-fail variant for bio_add_folio().

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Johannes Thumshirn

block: add bio_add_folio_nofail

Just like for bio_add_pages() add a no-fail variant for bio_add_folio().

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/924dff4077812804398ef84128fb920507fa4be1.1685532726.git.johannes.thumshirn@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: mark bio_add_page as __must_check

Now that all users of bio_add_page check for the return value, mark
bio_add_page as __must_check.

Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.

block: mark bio_add_page as __must_check

Now that all users of bio_add_page check for the return value, mark
bio_add_page as __must_check.

Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/7ae4a902e08fe2e90c012ee07aeb35d4aae28373.1685532726.git.johannes.thumshirn@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: Add BIO_PAGE_PINNED and associated infrastructure

Add BIO_PAGE_PINNED to indicate that the pages in a bio are pinned
(FOLL_PIN) and that the pin will need removing.

Signed-off-by: David Howe

block: Add BIO_PAGE_PINNED and associated infrastructure

Add BIO_PAGE_PINNED to indicate that the pages in a bio are pinned
(FOLL_PIN) and that the pin will need removing.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Jan Kara <jack@suse.cz>
cc: Matthew Wilcox <willy@infradead.org>
cc: Logan Gunthorpe <logang@deltatee.com>
cc: linux-block@vger.kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230522205744.2825689-5-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic

Replace BIO_NO_PAGE_REF with a BIO_PAGE_REFFED flag that has the inverted
meaning is only set when a page reference has been a

block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic

Replace BIO_NO_PAGE_REF with a BIO_PAGE_REFFED flag that has the inverted
meaning is only set when a page reference has been acquired that needs to
be released by bio_release_pages().

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Jan Kara <jack@suse.cz>
cc: Matthew Wilcox <willy@infradead.org>
cc: Logan Gunthorpe <logang@deltatee.com>
cc: linux-block@vger.kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230522205744.2825689-4-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: Fix bio_flagged() so that gcc can better optimise it

Fix bio_flagged() so that multiple instances of it, such as:

if (bio_flagged(bio, BIO_PAGE_REFFED) ||
bio_flagged(bio, BIO_PAGE_PIN

block: Fix bio_flagged() so that gcc can better optimise it

Fix bio_flagged() so that multiple instances of it, such as:

if (bio_flagged(bio, BIO_PAGE_REFFED) ||
bio_flagged(bio, BIO_PAGE_PINNED))

can be combined by the gcc optimiser into a single test in assembly
(arguably, this is a compiler optimisation issue[1]).

The missed optimisation stems from bio_flagged() comparing the result of
the bitwise-AND to zero. This results in an out-of-line bio_release_page()
being compiled to something like:

<+0>: mov 0x14(%rdi),%eax
<+3>: test $0x1,%al
<+5>: jne 0xffffffff816dac53 <bio_release_pages+11>
<+7>: test $0x2,%al
<+9>: je 0xffffffff816dac5c <bio_release_pages+20>
<+11>: movzbl %sil,%esi
<+15>: jmp 0xffffffff816daba1 <__bio_release_pages>
<+20>: jmp 0xffffffff81d0b800 <__x86_return_thunk>

However, the test is superfluous as the return type is bool. Removing it
results in:

<+0>: testb $0x3,0x14(%rdi)
<+4>: je 0xffffffff816e4af4 <bio_release_pages+15>
<+6>: movzbl %sil,%esi
<+10>: jmp 0xffffffff816dab7c <__bio_release_pages>
<+15>: jmp 0xffffffff81d0b7c0 <__x86_return_thunk>

instead.

Also, the MOVZBL instruction looks unnecessary[2] - I think it's just
're-booling' the mark_dirty parameter.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: linux-block@vger.kernel.org
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108370 [1]
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108371 [2]
Link: https://lore.kernel.org/r/167391056756.2311931.356007731815807265.stgit@warthog.procyon.org.uk/ # v6
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230522205744.2825689-3-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

btrfs, block: move REQ_CGROUP_PUNT to btrfs

REQ_CGROUP_PUNT is a bit annoying as it is hard to follow and adds
a branch to the bio submission hot path. To fix this, export
blkcg_punt_bio_submit and

btrfs, block: move REQ_CGROUP_PUNT to btrfs

REQ_CGROUP_PUNT is a bit annoying as it is hard to follow and adds
a branch to the bio submission hot path. To fix this, export
blkcg_punt_bio_submit and let btrfs call it directly. Add a new
REQ_FS_PRIVATE flag for btrfs to indicate to it's own low-level
bio submission code that a punt to the cgroup submission helper
is required.

Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

block: export bio_split_rw

bio_split_rw can be used by file systems to split and incoming write
bio into multiple bios fitting the hardware limit for use as ZONE_APPEND
bios. Export it for initial

block: export bio_split_rw

bio_split_rw can be used by file systems to split and incoming write
bio into multiple bios fitting the hardware limit for use as ZONE_APPEND
bios. Export it for initial use in btrfs.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

Revert "block: bio_copy_data_iter"

This reverts commit db1c7d77976775483a8ef240b4c705f113e13ea1.

We're reinstating the pktcdvd driver, which needs this API.

Signed-off-by: Jens Axboe <axboe@kernel

Revert "block: bio_copy_data_iter"

This reverts commit db1c7d77976775483a8ef240b4c705f113e13ea1.

We're reinstating the pktcdvd driver, which needs this API.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: don't clear REQ_ALLOC_CACHE for non-polled requests

Since commit:

b99182c501c3 ("bio: add pcpu caching for non-polling bio_put")

we support bio caching for IRQ based IO as well, hence there

block: don't clear REQ_ALLOC_CACHE for non-polled requests

Since commit:

b99182c501c3 ("bio: add pcpu caching for non-polling bio_put")

we support bio caching for IRQ based IO as well, hence there's no need
to manually clear REQ_ALLOC_CACHE if we disable polling on a request.

Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: bio_copy_data_iter

With the pktcdvdv removal, bio_copy_data_iter is unused now. Fold the
logic into bio_copy_data and remove the separate lower level function.

Signed-off-by: Christoph Hell

block: bio_copy_data_iter

With the pktcdvdv removal, bio_copy_data_iter is unused now. Fold the
logic into bio_copy_data and remove the separate lower level function.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221206144407.722049-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

blk-throttle: fix that io throttle can only work for single bio

Test scripts:
cd /sys/fs/cgroup/blkio/
echo "8:0 1024" > blkio.throttle.write_bps_device
echo $$ > cgroup.procs
dd if=/dev/zero of=/de

blk-throttle: fix that io throttle can only work for single bio

Test scripts:
cd /sys/fs/cgroup/blkio/
echo "8:0 1024" > blkio.throttle.write_bps_device
echo $$ > cgroup.procs
dd if=/dev/zero of=/dev/sda bs=10k count=1 oflag=direct &
dd if=/dev/zero of=/dev/sda bs=10k count=1 oflag=direct &

Test result:
10240 bytes (10 kB, 10 KiB) copied, 10.0134 s, 1.0 kB/s
10240 bytes (10 kB, 10 KiB) copied, 10.0135 s, 1.0 kB/s

The problem is that the second bio is finished after 10s instead of 20s.

Root cause:
1) second bio will be flagged:

__blk_throtl_bio
while (true) {
...
if (sq->nr_queued[rw]) -> some bio is throttled already
break
};
bio_set_flag(bio, BIO_THROTTLED); -> flag the bio

2) flagged bio will be dispatched without waiting:

throtl_dispatch_tg
tg_may_dispatch
tg_with_in_bps_limit
if (bps_limit == U64_MAX || bio_flagged(bio, BIO_THROTTLED))
*wait = 0; -> wait time is zero
return true;

commit 9f5ede3c01f9 ("block: throttle split bio in case of iops limit")
support to count split bios for iops limit, thus it adds flagged bio
checking in tg_with_in_bps_limit() so that split bios will only count
once for bps limit, however, it introduce a new problem that io throttle
won't work if multiple bios are throttled.

In order to fix the problem, handle iops/bps limit in different ways:

1) for iops limit, there is no flag to record if the bio is throttled,
and iops is always applied.
2) for bps limit, original bio will be flagged with BIO_BPS_THROTTLED,
and io throttle will ignore bio with the flag.

Noted this patch also remove the code to set flag in __bio_clone(), it's
introduced in commit 111be8839817 ("block-throttle: avoid double
charge"), and author thinks split bio can be resubmited and throttled
again, which is wrong because split bio will continue to dispatch from
caller.

Fixes: 9f5ede3c01f9 ("block: throttle split bio in case of iops limit")
Cc: <stable@vger.kernel.org>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220829022240.3348319-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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block: Use the new blk_opf_t type

Use the new blk_opf_t type for arguments and variables that represent
request flags or a bitwise combination of a request operation and
request flags. Rename the fu

block: Use the new blk_opf_t type

Use the new blk_opf_t type for arguments and variables that represent
request flags or a bitwise combination of a request operation and
request flags. Rename the function arguments and also a structure member
that hold a request operation and flags from 'rw' into 'opf'.

This patch does not change any functionality.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-7-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: remove bioset_init_from_src

Unused now, and the interface never really made a whole lot of sense to
start with.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <sni

block: remove bioset_init_from_src

Unused now, and the interface never really made a whole lot of sense to
start with.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

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block: Do not call folio_next() on an unreferenced folio

It is unsafe to call folio_next() on a folio unless you hold a reference
on it that prevents it from being split or freed. After returning
f

block: Do not call folio_next() on an unreferenced folio

It is unsafe to call folio_next() on a folio unless you hold a reference
on it that prevents it from being split or freed. After returning
from the iterator, iomap calls folio_end_writeback() which may drop
the last reference to the page, or allow the page to be split. If that
happens, the iterator will not advance far enough through the bio_vec,
leading to assertion failures like the BUG() in folio_end_writeback()
that checks we're not trying to end writeback on a page not currently
under writeback. Other assertion failures were also seen, but they're
all explained by this one bug.

Fix the bug by remembering where the next folio starts before returning
from the iterator. There are other ways of fixing this bug, but this
seems the simplest.

Reported-by: Darrick J. Wong <djwong@kernel.org>
Tested-by: Darrick J. Wong <djwong@kernel.org>
Reported-by: Brian Foster <bfoster@redhat.com>
Tested-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

show more ...

block: turn bio_kmalloc into a simple kmalloc wrapper

Remove the magic autofree semantics and require the callers to explicitly
call bio_init to initialize the bio.

This allows bio_free to catch ac

block: turn bio_kmalloc into a simple kmalloc wrapper

Remove the magic autofree semantics and require the callers to explicitly
call bio_init to initialize the bio.

This allows bio_free to catch accidental bio_put calls on bio_init()ed
bios as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Coly Li <colyli@suse.de>
Acked-by: Mike Snitzer <snitzer@kernel.org>
Link: https://lore.kernel.org/r/20220406061228.410163-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: allow use of per-cpu bio alloc cache by block drivers

Refine per-cpu bio alloc cache interfaces so that DM and other block
drivers can properly create and use the cache:

DM uses bioset_init_

block: allow use of per-cpu bio alloc cache by block drivers

Refine per-cpu bio alloc cache interfaces so that DM and other block
drivers can properly create and use the cache:

DM uses bioset_init_from_src() to do its final bioset initialization,
so must update bioset_init_from_src() to set BIOSET_PERCPU_CACHE if
%src bioset has a cache.

Also move bio_clear_polled() to include/linux/bio.h to allow users
outside of block core.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220324203526.62306-3-snitzer@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: allow using the per-cpu bio cache from bio_alloc_bioset

Replace the BIO_PERCPU_CACHE bio-internal flag with a REQ_ALLOC_CACHE
one that can be passed to bio_alloc / bio_alloc_bioset, and imple

block: allow using the per-cpu bio cache from bio_alloc_bioset

Replace the BIO_PERCPU_CACHE bio-internal flag with a REQ_ALLOC_CACHE
one that can be passed to bio_alloc / bio_alloc_bioset, and implement
the percpu cache allocation logic in a helper called from
bio_alloc_bioset. This allows any bio_alloc_bioset user to use the
percpu caches instead of having the functionality tied to struct kiocb.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
[hch: refactored a bit]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220324203526.62306-2-snitzer@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

block: remove bio_devname

All callers are gone, so remove this wrapper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Johannes Thumshir

block: remove bio_devname

All callers are gone, so remove this wrapper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220304180105.409765-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

scsi: block: Remove REQ_OP_WRITE_SAME support

No more users of REQ_OP_WRITE_SAME or drivers implementing it are left,
so remove the infrastructure.

[mkp: fold in and tweak sysfs reporting fix]

Lin

scsi: block: Remove REQ_OP_WRITE_SAME support

No more users of REQ_OP_WRITE_SAME or drivers implementing it are left,
so remove the infrastructure.

[mkp: fold in and tweak sysfs reporting fix]

Link: https://lore.kernel.org/r/20220209082828.2629273-8-hch@lst.de
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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