linux.git/drivers/md/dm-cache-target.c, branch v3.12

dm cache: eliminate holes in cache structure

2013-08-23T13:02:14+00:00

Reorder members in the cache structure to eliminate 6 out of 7 holes
(reclaiming 24 bytes).  Also, the 'worker' and 'waker' members no longer
straddle cachelines.

Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon 
Acked-by: Joe Thornber

dm cache: fix stacking of geometry limits

2013-08-23T13:02:14+00:00

Do not blindly override the queue limits (specifically io_min and
io_opt).  Allow traditional stacking of these limits if io_opt is a
factor of the cache's data block size.

Without this patch mkfs.xfs does not recognize the cache device's
provided limits as a useful geometry (e.g. raid) so these hints are
ignored.  This was due to setting io_min to a useless value.

Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon 
Acked-by: Joe Thornber

dm cache: add data block size limits to code and Documentation

2013-08-23T13:02:13+00:00

Place upper bound on the cache's data block size (1GB).

Inform users that the data block size can't be any arbitrary number,
i.e. its value must be between 32KB and 1GB.  Also, it should be a
multiple of 32KB.

Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon 
Acked-by: Joe Thornber

dm cache: fix arm link errors with inline

2013-07-10T22:41:17+00:00

Use __always_inline to avoid a link failure with gcc 4.6 on ARM.
gcc 4.7 is OK.

It creates a function block_div.part.8, it references __udivdi3 and
__umoddi3 and it is never called. The references to __udivdi3 and
__umoddi3 cause a link failure.

Reported-by: Rob Herring 
Signed-off-by: Mikulas Patocka 
Signed-off-by: Alasdair G Kergon

dm cache: set config value

2013-05-10T13:37:21+00:00

Share configuration option processing code between the dm cache
ctr and message functions.

Signed-off-by: Joe Thornber 
Signed-off-by: Alasdair G Kergon

dm cache: move config fns

2013-05-10T13:37:21+00:00

Move process_config_option() in dm-cache-target.c to make the
next patch more readable.

Signed-off-by: Alasdair G Kergon

dm cache: replace memcpy with struct assignment

2013-05-10T13:37:18+00:00

Use struct assignment rather than memcpy in dm cache.

Signed-off-by: Joe Thornber 
Signed-off-by: Alasdair G Kergon

dm cache: fix typos in comments

2013-05-10T13:37:18+00:00

Fix up some typos in dm-cache comments.

Signed-off-by: Joe Thornber 
Signed-off-by: Alasdair G Kergon

dm cache: tune migration throttling

2013-05-10T13:37:16+00:00

Tune the dm cache migration throttling.

i) Issue a tick every second, just in case there's no i/o going through.

ii) Drop the migration threshold right down to something suitable for
background work.

Signed-off-by: Joe Thornber 
Signed-off-by: Alasdair G Kergon

dm cache: fix error return code in cache_create

2013-05-10T13:37:14+00:00

Return -ENOMEM if memory allocation fails in cache_create
instead of 0 (to avoid NULL pointer dereference).

Signed-off-by: Wei Yongjun 
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon