linux-toradex.git/drivers/md/dm-thin-metadata.c, branch v3.11

dm thin: generate event when metadata threshold passed

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

Generate a dm event when the amount of remaining thin pool metadata
space falls below a certain level.

The threshold is taken to be a quarter of the size of the metadata
device with a minimum threshold of 4MB.

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

dm thin: detect metadata device resizing

2013-05-10T13:37:19+00:00

Allow the dm thin pool metadata device to be extended.

Whenever a pool is resumed, detect whether the size of the metadata
device has increased, and if so, extend the metadata to use the new
space.

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

dm thin: refactor data dev resize

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

Refactor device size functions in preparation for similar metadata
device resizing functions.

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

dm persistent data: set some btree fn parms const

2013-03-01T22:45:47+00:00

Mark some constant parameters constant in some dm-btree functions.

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

dm persistent data: fix nested btree deletion

2012-12-21T20:23:32+00:00

When deleting nested btrees, the code forgets to delete the innermost
btree.  The thin-metadata code serendipitously compensates for this by
claiming there is one extra layer in the tree.

This patch corrects both problems.

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

dm thin metadata: introduce dm_pool_abort_metadata

2012-07-27T14:08:15+00:00

Introduce dm_pool_abort_metadata to abort the current metadata
transaction.  Generally this will only be called when bad things are
happening and dm-thin is trying to roll back to a good state for
read-only mode.

It's complicated by the fact that the metadata device may have failed
completely causing the abort to be unable to read the old transaction.
In this case the metadata object is placed in a 'fail' mode and
everything fails apart from destroying it.

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

dm thin metadata: introduce dm_pool_metadata_set_read_only

2012-07-27T14:08:15+00:00

Introduce dm_pool_metadata_set_read_only to put the underlying block
manager into read-only mode.

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

dm thin metadata: add dm_thin_changed_this_transaction

2012-07-27T14:08:14+00:00

Introduce dm_thin_changed_this_transaction to dm-thin-metadata to publish a
useful bit of information we're already tracking.  This will help dm thin
decide when to commit.

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

dm thin metadata: add format option to dm_pool_metadata_open

2012-07-27T14:08:14+00:00

Add a parameter to dm_pool_metadata_open to indicate whether or not an
unformatted metadata area should be formatted.

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

dm thin metadata: tidy up open and format error paths

2012-07-27T14:08:14+00:00

Tidy up error path in __open_metadata and __format_metadata in dm-thin-metadata.

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