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dm thin metadata: add dm_thin_remove_range() 

Removes a range of blocks from the btree.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2015-04-13 09:45:25 +01:00 committed by Mike Snitzer
parent a5d895a90b
commit 6550f075f5
2 changed files with 56 additions and 0 deletions
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54
drivers/md/dm-thin-metadata.c
View File

@ -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;

2
drivers/md/dm-thin-metadata.h
View File

@ -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.