Fix regression in dm-crypt introduced in commit
3a7f6c990a ("dm crypt: use async crypto").
If write requests need to be split into pieces, the code must not process them
in parallel because the crypto context cannot be shared. So there can be
parallel crypto operations on one part of the write, but only one write bio
can be processed at a time.
This is not optimal and the workqueue code needs to be optimized for parallel
processing, but for now it solves the problem without affecting the
performance of synchronous crypto operation (most of current dm-crypt users).
http://bugzilla.kernel.org/show_bug.cgi?id=10242http://bugzilla.kernel.org/show_bug.cgi?id=10207
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Milan Brozauthored and Linus Torvaldscommited 2008-03-28 14:45:22 -07:00
dm-crypt: Use crypto ablkcipher interface
Move encrypt/decrypt core to async crypto call.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:11:14 +00:00
dm-crypt: Use crypto ablkcipher interface
Prepare callback function for async crypto operation.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:11:12 +00:00
dm-crypt: Use crypto ablkcipher interface
Prepare completion for async crypto request.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:11:09 +00:00
dm-crypt: Use crypto ablkcipher interface
Introduce mempool for async crypto requests.
cc->req is used mainly during synchronous operations
(to prevent allocation and deallocation of the same object).
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:11:07 +00:00
dm-crypt: Use crypto ablkcipher interface
Move scatterlists to separate dm_crypt_struct and
pick out block processing from crypt_convert.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:11:04 +00:00
Process write request in separate function and queue
final bio through io workqueue.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:10:57 +00:00
Add sector into dm_crypt_io instead of using local variable.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:10:54 +00:00
Move error code setting outside of crypt_dec_pending function.
Use -EIO if crypt_convert_scatterlist() fails.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:10:43 +00:00
Remove write attribute from convert_context and use bio flag instead.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2008-02-08 02:10:41 +00:00
Fix possible max_phys_segments violation in cloned dm-crypt bio.
In write operation dm-crypt needs to allocate new bio request
and run crypto operation on this clone. Cloned request has always
the same size, but number of physical segments can be increased
and violate max_phys_segments restriction.
This can lead to data corruption and serious hardware malfunction.
This was observed when using XFS over dm-crypt and at least
two HBA controller drivers (arcmsr, cciss) recently.
Fix it by using bio_add_page() call (which tests for other
restrictions too) instead of constructing own biovec.
All versions of dm-crypt are affected by this bug.
Cc: stable@kernel.org
Cc: dm-crypt@saout.de
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-12-20 17:32:13 +00:00
Fix BIO_UPTODATE test for write io.
Cc: stable@kernel.org
Cc: dm-crypt@saout.de
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-12-20 17:32:10 +00:00
This patch fixes the errors made in the users of the crypto layer during
the sg_init_table conversion. It also adds a few conversions that were
missing altogether.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Herbert Xuauthored and David S. Millercommited 2007-10-27 00:52:07 -07:00
Most drivers need to set length and offset as well, so may as well fold
those three lines into one.
Add sg_assign_page() for those two locations that only needed to set
the page, where the offset/length is set outside of the function context.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial: (74 commits)
fix do_sys_open() prototype
sysfs: trivial: fix sysfs_create_file kerneldoc spelling mistake
Documentation: Fix typo in SubmitChecklist.
Typo: depricated -> deprecated
Add missing profile=kvm option to Documentation/kernel-parameters.txt
fix typo about TBI in e1000 comment
proc.txt: Add /proc/stat field
small documentation fixes
Fix compiler warning in smount example program from sharedsubtree.txt
docs/sysfs: add missing word to sysfs attribute explanation
documentation/ext3: grammar fixes
Documentation/java.txt: typo and grammar fixes
Documentation/filesystems/vfs.txt: typo fix
include/asm-*/system.h: remove unused set_rmb(), set_wmb() macros
trivial copy_data_pages() tidy up
Fix typo in arch/x86/kernel/tsc_32.c
file link fix for Pegasus USB net driver help
remove unused return within void return function
Typo fixes retrun -> return
x86 hpet.h: remove broken links
...
Add crypt prefix to dec_pending to avoid confusing it in backtraces with
the dm core function of the same name.
No functional change here.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-10-20 02:01:28 +01:00
Replace numbers with names in labels in error paths, to avoid confusion
when new one get added between existing ones.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-10-20 02:01:17 +01:00
Clean up, convert some spaces to tabs.
No functional change here.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-10-20 02:01:15 +01:00
Add post-processing queue (per crypt device) for read operations.
Current implementation uses only one queue for all operations
and this can lead to starvation caused by many requests waiting
for memory allocation. But the needed memory-releasing operation
is queued after these requests (in the same queue).
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-10-20 02:01:14 +01:00
Use a separate single-threaded workqueue for each crypt device
instead of one global workqueue.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Milan Brozauthored and Alasdair G Kergoncommited 2007-10-20 02:01:13 +01:00
Add a missing 'dm_put_device' in an error path in crypt target constructor.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Dmitry Monakhovauthored and Alasdair G Kergoncommited 2007-10-20 02:00:59 +01:00
Fix the various misspellings of "system", controller", "interrupt" and
"[un]necessary".
Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Robert P. J. Dayauthored and Adrian Bunkcommited 2007-10-19 23:10:43 +02:00
dm-crypt used the ->bi_size member in the bio endio handling to
free the appropriate pages, but it frees all of it from both call
paths. With the ->bi_end_io() changes, ->bi_size was always 0 since
we don't do partial completes. This caused dm-crypt to leak memory.
Fix this by removing the size argument from crypt_free_buffer_pages().
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Neil Brownauthored and Jens Axboecommited 2007-10-16 13:48:46 +02:00
As bi_end_io is only called once when the reqeust is complete,
the 'size' argument is now redundant. Remove it.
Now there is no need for bio_endio to subtract the size completed
from bi_size. So don't do that either.
While we are at it, change bi_end_io to return void.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
NeilBrownauthored and Jens Axboecommited 2007-10-10 09:25:57 +02:00
Flush workqueue before releasing bioset and mopools in dm-crypt. There can
be finished but not yet released request.
Call chain causing oops:
run workqueue
dec_pending
bio_endio(...);
<remove device request - remove mempool>
mempool_free(io, cc->io_pool);
This usually happens when cryptsetup create temporary
luks mapping in the beggining of crypt device activation.
When dm-core calls destructor crypt_dtr, no new request
are possible.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Cc: Chuck Ebbert <cebbert@redhat.com>
Cc: Patrick McHardy <kaber@trash.net>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Cc: Christophe Saout <christophe@saout.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Milan Brozauthored and Linus Torvaldscommited 2007-07-21 17:49:14 -07:00
This patch causes device-mapper to reject any barrier requests. This is done
since most of the targets won't handle this correctly anyway. So until the
situation improves it is better to reject these requests at the first place.
Since barrier requests won't get to the targets, the checks there can be
removed.
Cc: stable@kernel.org
Signed-off-by: Stefan Bader <shbader@de.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Stefan Baderauthored and Linus Torvaldscommited 2007-07-12 15:01:08 -07:00
Use new KMEM_CACHE() macro and make the newly-exposed structure names more
meaningful. Also remove some superfluous casts and inlines (let a modern
compiler be the judge).
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Alasdair G Kergonauthored and Linus Torvaldscommited 2007-07-12 15:01:08 -07:00
Add a new IV generation method 'null' to read old filesystem images created
with SuSE's loop_fish2 module.
Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Acked-By: Christophe Saout <christophe@saout.de>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Ludwig Nusselauthored and Linus Torvaldscommited 2007-05-09 12:30:46 -07:00
Allocate smaller clones
With the previous dm-crypt fixes, there is no need for the clone bios to have
the same bvec size as the original - we just need to make them big enough for
the remaining number of pages. The only requirement is that we clear the
"out" index in convert_context, so that crypt_convert starts storing data at
the right position within the clone bio.
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Olaf Kirchauthored and Linus Torvaldscommited 2007-05-09 12:30:46 -07:00
Get rid of first_clone in dm-crypt
This gets rid of first_clone, which is not really needed. Apparently, cloned
bios used to share their bvec some time way in the past - this is no longer
the case. Contrarily, this even hurts us if we try to create a clone off
first_clone after it has completed, and crypt_endio has destroyed its bvec.
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Olaf Kirchauthored and Linus Torvaldscommited 2007-05-09 12:30:46 -07:00
Do not access the bio after generic_make_request
We should never access a bio after generic_make_request - there's no guarantee
it still exists.
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Olaf Kirchauthored and Linus Torvaldscommited 2007-05-09 12:30:46 -07:00
Call clone_init early
We need to call clone_init as early as possible - at least before call
bio_put(clone) in any error path. Otherwise, the destructor will try to
dereference bi_private, which may still be NULL.
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Olaf Kirchauthored and Linus Torvaldscommited 2007-05-09 12:30:46 -07:00
Disable barriers in dm-crypt because of current workqueue processing can
reorder requests.
This must be addresed later but for now disabling barriers is needed to
prevent data corruption.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Milan Brozauthored and Linus Torvaldscommited 2007-05-09 12:30:46 -07:00
Currently we scale the mempool sizes depending on memory installed
in the machine, except for the bio pool itself which sits at a fixed
256 entry pre-allocation.
There's really no point in "optimizing" this OOM path, we just need
enough preallocated to make progress. A single unit is enough, lets
scale it down to 2 just to be on the safe side.
This patch saves ~150kb of pinned kernel memory on a 32-bit box.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Update existing targets to use the new symbols for return values from target
map and end_io functions.
There is no effect on behaviour.
Test results:
Done build test without errors.
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Kiyoshi Uedaauthored and Linus Torvaldscommited 2006-12-08 08:29:09 -08:00
This facility provides three entry points:
ilog2() Log base 2 of unsigned long
ilog2_u32() Log base 2 of u32
ilog2_u64() Log base 2 of u64
These facilities can either be used inside functions on dynamic data:
int do_something(long q)
{
...;
y = ilog2(x)
...;
}
Or can be used to statically initialise global variables with constant values:
unsigned n = ilog2(27);
When performing static initialisation, the compiler will report "error:
initializer element is not constant" if asked to take a log of zero or of
something not reducible to a constant. They treat negative numbers as
unsigned.
When not dealing with a constant, they fall back to using fls() which permits
them to use arch-specific log calculation instructions - such as BSR on
x86/x86_64 or SCAN on FRV - if available.
[akpm@osdl.org: MMC fix]
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Howells <dhowells@redhat.com>
Cc: Wojtek Kaniewski <wojtekka@toxygen.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
David Howellsauthored and Linus Torvaldscommited 2006-12-08 08:28:51 -08:00
Replace all uses of kmem_cache_t with struct kmem_cache.
The patch was generated using the following script:
#!/bin/sh
#
# Replace one string by another in all the kernel sources.
#
set -e
for file in `find * -name "*.c" -o -name "*.h"|xargs grep -l $1`; do
quilt add $file
sed -e "1,\$s/$1/$2/g" $file >/tmp/$$
mv /tmp/$$ $file
quilt refresh
done
The script was run like this
sh replace kmem_cache_t "struct kmem_cache"
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Christoph Lameterauthored and Linus Torvaldscommited 2006-12-07 08:39:25 -08:00
Rather than stuffing integers into pointers with casts, let's use
a union.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Herbert Xuauthored and David S. Millercommited 2006-12-06 18:39:01 -08:00
LRW-32-AES needs a certain IV. This IV should be provided dm-crypt.
The block cipher mode could, in principle generate the correct IV from
the plain IV, but I think that it is cleaner to supply the right IV
directly.
The sector -> narrow block calculation uses a shift for performance reasons.
This shift is computed in .ctr and stored in cc->iv_gen_private (as a void *).
Signed-off-by: Rik Snel <rsnel@cube.dyndns.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Rik Snelauthored and David S. Millercommited 2006-12-06 18:38:47 -08:00
Milan Broz
authored and
Linus Torvalds
commited 
Alasdair G Kergon
commited 
Herbert Xu
authored and
David S. Miller
commited 
Jens Axboe
commited 
Linus Torvalds
commited 
Dmitry Monakhov
authored and
Robert P. J. Day
authored and
Adrian Bunk
commited 
Neil Brown
authored and
Jens Axboe
commited 
Stefan Bader
authored and
Ludwig Nussel
authored and
Olaf Kirch
authored and
Kiyoshi Ueda
authored and
Linus Torvalds
commited 
David Howells
authored and
Christoph Lameter
authored and
David S. Miller
commited 
Rik Snel
authored and