22 Oct, 2015
3 commits
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Since they lack requests to pin the request_queue active, synchronous
bio-based drivers may have in-flight integrity work from
bio_integrity_endio() that is not flushed by blk_freeze_queue(). Flush
that work to prevent races to free the queue and the final usage of the
blk_integrity profile.This is temporary unless/until bio-based drivers start to generically
take a q_usage_counter reference while a bio is in-flight.Cc: Martin K. Petersen
[martin: fix the CONFIG_BLK_DEV_INTEGRITY=n case]
Tested-by: Ross Zwisler
Signed-off-by: Dan Williams
Signed-off-by: Jens Axboe -
The per-device properties in the blk_integrity structure were previously
unsigned short. However, most of the values fit inside a char. The only
exception is the data interval size and we can work around that by
storing it as a power of two.This cuts the size of the dynamic portion of blk_integrity in half.
Signed-off-by: Martin K. Petersen
Reported-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Dan Williams
Signed-off-by: Jens Axboe -
We previously made a complete copy of a device's data integrity profile
even though several of the fields inside the blk_integrity struct are
pointers to fixed template entries in t10-pi.c.Split the static and per-device portions so that we can reference the
template directly.Signed-off-by: Martin K. Petersen
Reported-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Cc: Dan Williams
Signed-off-by: Dan Williams
Signed-off-by: Jens Axboe
11 Sep, 2015
1 commit
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This is only theoretical at the moment given that the only
subsystems that generate integrity payloads are the block layer
itself and the scsi target (which generate well aligned integrity
payloads). But when we will expose integrity meta-data to user-space,
we'll need to refuse appending a page with a gap (if the queue
virtual boundary is set).Signed-off-by: Sagi Grimberg
Signed-off-by: Jens Axboe
29 Jul, 2015
1 commit
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Currently we have two different ways to signal an I/O error on a BIO:
(1) by clearing the BIO_UPTODATE flag
(2) by returning a Linux errno value to the bi_end_io callbackThe first one has the drawback of only communicating a single possible
error (-EIO), and the second one has the drawback of not beeing persistent
when bios are queued up, and are not passed along from child to parent
bio in the ever more popular chaining scenario. Having both mechanisms
available has the additional drawback of utterly confusing driver authors
and introducing bugs where various I/O submitters only deal with one of
them, and the others have to add boilerplate code to deal with both kinds
of error returns.So add a new bi_error field to store an errno value directly in struct
bio and remove the existing mechanisms to clean all this up.Signed-off-by: Christoph Hellwig
Reviewed-by: Hannes Reinecke
Reviewed-by: NeilBrown
Signed-off-by: Jens Axboe
07 Jul, 2015
1 commit
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bio_integrity_alloc() and bio_integrity_free() assume that if a bio was
allocated from a bioset that that bioset also had its bio_integrity_pool
allocated using bioset_integrity_create(). This is a very bad
assumption given that bioset_create() and bioset_integrity_create() are
completely disjoint. Not all callers of bioset_create() have been
trained to also call bioset_integrity_create() -- and they may not care
to be.Fix this by falling back to kmalloc'ing 'struct bio_integrity_payload'
rather than force all bioset consumers to (wastefully) preallocate a
bio_integrity_pool that they very likely won't actually need (given the
niche nature of the current block integrity support).Otherwise, a NULL pointer "Kernel BUG" with a trace like the following
will be observed (as seen on s390x using zfcp storage) because dm-io
doesn't use bioset_integrity_create() when creating its bioset:[ 791.643338] Call Trace:
[ 791.643339] ([] 0x3df98b848)
[ 791.643341] [] bio_integrity_alloc+0x48/0xf8
[ 791.643348] [] bio_integrity_prep+0xae/0x2f0
[ 791.643349] [] blk_queue_bio+0x1c8/0x3d8
[ 791.643355] [] generic_make_request+0xc0/0x100
[ 791.643357] [] submit_bio+0xa2/0x198
[ 791.643406] [] dispatch_io+0x15c/0x3b0 [dm_mod]
[ 791.643419] [] dm_io+0x176/0x2f0 [dm_mod]
[ 791.643423] [] do_reads+0x13a/0x1a8 [dm_mirror]
[ 791.643425] [] do_mirror+0x142/0x298 [dm_mirror]
[ 791.643428] [] process_one_work+0x18a/0x3f8
[ 791.643432] [] worker_thread+0x132/0x3b0
[ 791.643435] [] kthread+0xd2/0xd8
[ 791.643438] [] kernel_thread_starter+0x6/0xc
[ 791.643446] [] kernel_thread_starter+0x0/0xcSigned-off-by: Mike Snitzer
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe
22 May, 2015
1 commit
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Commit c4cf5261 ("bio: skip atomic inc/dec of ->bi_remaining for
non-chains") regressed all existing callers that followed this pattern:
1) saving a bio's original bi_end_io
2) wiring up an intermediate bi_end_io
3) restoring the original bi_end_io from intermediate bi_end_io
4) calling bio_endio() to execute the restored original bi_end_ioThe regression was due to BIO_CHAIN only ever getting set if
bio_inc_remaining() is called. For the above pattern it isn't set until
step 3 above (step 2 would've needed to establish BIO_CHAIN). As such
the first bio_endio(), in step 2 above, never decremented __bi_remaining
before calling the intermediate bi_end_io -- leaving __bi_remaining with
the value 1 instead of 0. When bio_inc_remaining() occurred during step
3 it brought it to a value of 2. When the second bio_endio() was
called, in step 4 above, it should've called the original bi_end_io but
it didn't because there was an extra reference that wasn't dropped (due
to atomic operations being optimized away since BIO_CHAIN wasn't set
upfront).Fix this issue by removing the __bi_remaining management complexity for
all callers that use the above pattern -- bio_chain() is the only
interface that _needs_ to be concerned with __bi_remaining. For the
above pattern callers just expect the bi_end_io they set to get called!
Remove bio_endio_nodec() and also remove all bio_inc_remaining() calls
that aren't associated with the bio_chain() interface.Also, the bio_inc_remaining() interface has been moved local to bio.c.
Fixes: c4cf5261 ("bio: skip atomic inc/dec of ->bi_remaining for non-chains")
Reviewed-by: Christoph Hellwig
Reviewed-by: Jan Kara
Signed-off-by: Mike Snitzer
Signed-off-by: Jens Axboe
02 Dec, 2014
1 commit
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bio integrity handling is broken on a system with LVM layered atop a
DIF/DIX SCSI drive because device mapper clones the bio, modifies the
clone, and sends the clone to the lower layers for processing.
However, the clone bio has bi_vcnt == 0, which means that when the sd
driver calls bio_integrity_process to attach DIX data, the
for_each_segment_all() call (which uses bi_vcnt) returns immediately
and random garbage is sent to the disk on a disk write. The disk of
course returns an error.Therefore, teach bio_integrity_process() to use bio_for_each_segment()
to iterate the bio_vecs, since the per-bio iterator tracks which
bio_vecs are associated with that particular bio. The integrity
handling code is effectively part of the "driver" (it's not the bio
owner), so it must use the correct iterator function.v2: Fix a compiler warning about abandoned local variables. This
patch supersedes "block: bio_integrity_process uses wrong bio_vec
iterator". Patch applies against 3.18-rc6.Signed-off-by: Darrick J. Wong
Acked-by: Martin K. Petersen
Signed-off-by: Jens Axboe
14 Oct, 2014
1 commit
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bip_slab is created with SLAB_PANIC, so the fail handler is unneeded.
Signed-off-by: Gu Zheng
Signed-off-by: Andrew Morton
Signed-off-by: Jens Axboe
27 Sep, 2014
10 commits
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Make the choice of checksum a per-I/O property by introducing a flag
that can be inspected by the SCSI layer. There are several reasons for
this:1. It allows us to switch choice of checksum without unloading and
reloading the HBA driver.2. During error recovery we need to be able to tell the HBA that
checksums read from disk should not be verified and converted to IP
checksums.3. For error injection purposes we need to be able to write a bad guard
tag to storage. Since the storage device only supports T10 CRC we
need to be able to disable IP checksum conversion on the HBA.Signed-off-by: Martin K. Petersen
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
Move flags affecting the integrity code out of the bio bi_flags and into
the block integrity payload.Signed-off-by: Martin K. Petersen
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
Add a BLK_ prefix to the integrity profile flags. Also rename the flags
to be more consistent with the generate/verify terminology in the rest
of the integrity code.Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
Instead of the "operate" parameter we pass in a seed value and a pointer
to a function that can be used to process the integrity metadata. The
generation function is changed to have a return value to fit into this
scheme.Signed-off-by: Martin K. Petersen
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
Now that the protection interval has been detached from the sector size
we need to be able to handle sizes that are different from 4K and
512. Make the interval calculation generic.Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
The protection interval is not necessarily tied to the logical block
size of a block device. Stop using the terms "sector" and "sectors".Going forward we will use the term "seed" to describe the initial
reference tag value for a given I/O. "Interval" will be used to describe
the portion of the data buffer that a given piece of protection
information is associated with.Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
bip_buf is not really needed so we can remove it.
Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
None of the filesystems appear interested in using the integrity tagging
feature. Potentially because very few storage devices actually permit
using the application tag space.Remove the tagging functions.
Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
For commands like REQ_COPY we need a way to pass extra information along
with each bio. Like integrity metadata this information must be
available at the bottom of the stack so bi_private does not suffice.Rename the existing bi_integrity field to bi_special and make it a union
so we can have different bio extensions for each class of command.We previously used bi_integrity != NULL as a way to identify whether a
bio had integrity metadata or not. Introduce a REQ_INTEGRITY to be the
indicator now that bi_special can contain different things.In addition, bio_integrity(bio) will now return a pointer to the
integrity payload (when applicable).Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
bdev_integrity_enabled() is only used by bio_integrity_enabled().
Combine these two functions.Signed-off-by: Martin K. Petersen
Reviewed-by: Christoph Hellwig
Reviewed-by: Sagi Grimberg
Signed-off-by: Jens Axboe
22 Aug, 2014
1 commit
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When getting a pi error we get to bio_integrity_end_io with
bi_remaining already decremented to 0 where we will eventually
need to call bio_endio with restored original bio completion handler.
Calling bio_endio invokes a BUG_ON(). We should call bio_endio_nodec
instead, like what is done in bio_integrity_verify_fn.Signed-off-by: Sagi Grimberg
Signed-off-by: Jens Axboe
02 Jul, 2014
1 commit
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Commit 08778795 ("block: Fix nr_vecs for inline integrity vectors") from
Martin introduces the function bip_integrity_vecs(get the useful vectors)
to fix the issue about nr_vecs for inline integrity vectors that reported
by David Milburn.But it seems that bip_integrity_vecs() will return the wrong number if the
bio is not based on any bio_set for some reason(bio->bi_pool == NULL),
because in that case, the bip_inline_vecs[0] is malloced directly. So
here we add the bip_max_vcnt to record the count of vector slots, and
cleanup the function bip_integrity_vecs().Signed-off-by: Gu Zheng
Cc: Martin K. Petersen
Cc: Kent Overstreet
Signed-off-by: Jens Axboe
19 May, 2014
1 commit
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They really belong in block/, especially now since it's not in
drivers/block/ anymore. Additionally, the get_maintainer script
gets it wrong when in fs/.Suggested-by: Christoph Hellwig
Acked-by: Al Viro
Signed-off-by: Jens Axboe
