linux-toradex.git/include/linux/device-mapper.h, branch v2.6.38.5

dm: per target unplug callback support

2011-01-13T20:00:02+00:00

Add per-target unplug callback support.

Cc: linux-raid@vger.kernel.org
Signed-off-by: NeilBrown 
Signed-off-by: Jonathan Brassow 
Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon

dm: introduce target callbacks and congestion callback

2011-01-13T20:00:01+00:00

DM currently implements congestion checking by checking on congestion
in each component device.  For raid456 we need to also check if the
stripe cache is congested.

Add per-target congestion checker callback support.

Extending the target_callbacks structure with additional callback
functions allows for establishing multiple callbacks per-target (a
callback is also needed for unplug).

Cc: linux-raid@vger.kernel.org
Signed-off-by: NeilBrown 
Signed-off-by: Jonathan Brassow 
Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon

dm: factor out max_io_len_target_boundary

2010-08-12T03:14:10+00:00

Split max_io_len_target_boundary out of max_io_len so that the discard
support can make use of it without duplicating max_io_len code.

Avoiding max_io_len's split_io logic enables DM's discard support to
submit the entire discard request to a target.  But discards must still
be split on target boundaries.

Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon

dm: linear support discard

2010-08-12T03:14:08+00:00

Allow discards to be passed through to linear mappings if at least one
underlying device supports it.  Discards will be forwarded only to
devices that support them.

A target that supports discards should set num_discard_requests to
indicate how many times each discard request must be submitted to it.

Verify table's underlying devices support discards prior to setting the
associated DM device as capable of discards (via QUEUE_FLAG_DISCARD).

Signed-off-by: Mike Snitzer 
Signed-off-by: Mikulas Patocka 
Reviewed-by: Joe Thornber 
Signed-off-by: Alasdair G Kergon

dm: rename map_info flush_request to target_request_nr

2010-08-12T03:14:04+00:00

'target_request_nr' is a more generic name that reflects the fact that
it will be used for both flush and discard support.

Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon

dm table: remove unused dm_get_device range parameters

2010-03-06T02:32:27+00:00

Remove unused parameters(start and len) of dm_get_device()
and fix the callers.

Signed-off-by: Nikanth Karthikesan 
Signed-off-by: Alasdair G Kergon

dm: export suspended state to targets

2009-12-10T23:52:27+00:00

This patch adds the exported dm_suspended() function so that targets
can check whether or not they are suspended.

Signed-off-by: Kiyoshi Ueda 
Signed-off-by: Jun'ichi Nomura 
Cc: Mike Anderson 
Signed-off-by: Alasdair G Kergon

dm: rename dm_suspended to dm_suspended_md

2009-12-10T23:52:26+00:00

This patch renames dm_suspended() to dm_suspended_md() and
keeps it internal to dm.
No functional change.

Signed-off-by: Kiyoshi Ueda 
Signed-off-by: Jun'ichi Nomura 
Cc: Mike Anderson 
Signed-off-by: Alasdair G Kergon

dm: keep old table until after resume succeeded

2009-12-10T23:52:24+00:00

When swapping a new table into place, retain the old table until
its replacement is in place.

An old check for an empty table is removed because this is enforced
in populate_table().

__unbind() becomes redundant when followed by __bind().

Signed-off-by: Alasdair G Kergon

dm: rename dm_get_table to dm_get_live_table

2009-12-10T23:52:19+00:00

Rename dm_get_table to dm_get_live_table.

Signed-off-by: Alasdair G Kergon