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Commit 6550f075 authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
Browse files

dm thin metadata: add dm_thin_remove_range() 



Removes a range of blocks from the btree.

Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent a5d895a9

drivers/md/dm-thin-metadata.c

+54 −0
Original line number Diff line number Diff line
@@ -1526,6 +1526,47 @@ static int __remove(struct dm_thin_device *td, dm_block_t block) 
	return 0;

}



static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end)

{

	int r;

	unsigned count;

	struct dm_pool_metadata *pmd = td->pmd;

	dm_block_t keys[1] = { td->id };

	__le64 value;

	dm_block_t mapping_root;



	/*

	 * Find the mapping tree

	 */

	r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value);

	if (r)

		return r;



	/*

	 * Remove from the mapping tree, taking care to inc the

	 * ref count so it doesn't get deleted.

	 */

	mapping_root = le64_to_cpu(value);

	dm_tm_inc(pmd->tm, mapping_root);

	r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root);

	if (r)

		return r;



	r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count);

	if (r)

		return r;



	td->mapped_blocks -= count;

	td->changed = 1;



	/*

	 * Reinsert the mapping tree.

	 */

	value = cpu_to_le64(mapping_root);

	__dm_bless_for_disk(&value);

	return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root);

}



int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block)

{

	int r = -EINVAL;
@@ -1538,6 +1579,19 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) 
	return r;

}



int dm_thin_remove_range(struct dm_thin_device *td,

			 dm_block_t begin, dm_block_t end)

{

	int r = -EINVAL;



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

	if (!td->pmd->fail_io)

		r = __remove_range(td, begin, end);

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



	return r;

}



int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result)

{

	int r;

drivers/md/dm-thin-metadata.h

+2 −0
Original line number Diff line number Diff line
@@ -167,6 +167,8 @@ int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, 
			 dm_block_t data_block);



int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block);

int dm_thin_remove_range(struct dm_thin_device *td,

			 dm_block_t begin, dm_block_t end);



/*

 * Queries.