linux.git/drivers/md/dm-crypt.c, branch v2.6.25

dm crypt: fix ctx pending

2008-03-28T21:45:22+00:00

Fix regression in dm-crypt introduced in commit
3a7f6c990ad04e6f576a159876c602d14d6f7fef ("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=10242
http://bugzilla.kernel.org/show_bug.cgi?id=10207

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon 
Cc: "Rafael J. Wysocki" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

dm crypt: use async crypto

2008-02-08T02:11:14+00:00

dm-crypt: Use crypto ablkcipher interface

Move encrypt/decrypt core to async crypto call.

Signed-off-by: Herbert Xu 
Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: prepare async callback fn

2008-02-08T02:11:12+00:00

dm-crypt: Use crypto ablkcipher interface

Prepare callback function for async crypto operation.

Signed-off-by: Herbert Xu 
Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: add completion for async

2008-02-08T02:11:09+00:00

dm-crypt: Use crypto ablkcipher interface
Prepare completion for async crypto request.

Signed-off-by: Herbert Xu 
Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: add async request mempool

2008-02-08T02:11:07+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 
Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: extract scatterlist processing

2008-02-08T02:11:04+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 
Signed-off-by: Alasdair G Kergon

dm crypt: tidy io ref counting

2008-02-08T02:11:02+00:00

Make io reference counting more obvious.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: introduce crypt_write_io_loop

2008-02-08T02:10:59+00:00

Introduce crypt_write_io_loop().

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: abstract crypt_write_done

2008-02-08T02:10:57+00:00

Process write request in separate function and queue
final bio through io workqueue.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm crypt: store sector mapping in dm_crypt_io

2008-02-08T02:10:54+00:00

Add sector into dm_crypt_io instead of using local variable.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon