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dm: add cache target

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Add a target that allows a fast device such as an SSD to be used as a
cache for a slower device such as a disk.

A plug-in architecture was chosen so that the decisions about which data
to migrate and when are delegated to interchangeable tunable policy
modules.  The first general purpose module we have developed, called
"mq" (multiqueue), follows in the next patch.  Other modules are
under development.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Heinz Mauelshagen <mauelshagen@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber
2013-03-01 22:45:51 +00:00
committed by Alasdair G Kergon
parent 7a87edfee7
commit c6b4fcbad0
13 changed files with 4718 additions and 0 deletions
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1
drivers/md/persistent-data/dm-block-manager.c
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@@ -613,6 +613,7 @@ int dm_bm_flush_and_unlock(struct dm_block_manager *bm,
return dm_bufio_write_dirty_buffers(bm->bufio);
}
EXPORT_SYMBOL_GPL(dm_bm_flush_and_unlock);
void dm_bm_set_read_only(struct dm_block_manager *bm)
{