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>
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 94cf0db..8b521e3 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1526,6 +1526,47 @@
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 @@
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;