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Commit 40db5a53 authored by Joe Thornber's avatar Joe Thornber Committed by Alasdair G Kergon
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dm thin metadata: add dm_thin_changed_this_transaction 



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: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 66b1edc0

drivers/md/dm-thin-metadata.c

+13 −3
Original line number Diff line number Diff line
@@ -1375,10 +1375,9 @@ static int __insert(struct dm_thin_device *td, dm_block_t block, 
	if (r)

		return r;



	if (inserted) {

		td->mapped_blocks++;

	td->changed = 1;

	}

	if (inserted)

		td->mapped_blocks++;



	return 0;

}
@@ -1422,6 +1421,17 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) 
	return r;

}



bool dm_thin_changed_this_transaction(struct dm_thin_device *td)

{

	int r;



	down_read(&td->pmd->root_lock);

	r = td->changed;

	up_read(&td->pmd->root_lock);



	return r;

}



int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)

{

	int r;

drivers/md/dm-thin-metadata.h

+2 −0
Original line number Diff line number Diff line
@@ -148,6 +148,8 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block); 
/*

 * Queries.

 */

bool dm_thin_changed_this_transaction(struct dm_thin_device *td);



int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,

				     dm_block_t *highest_mapped);