dm persistent data: fix nested btree deletion
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 <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 693e149..4d6e853 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -408,7 +408,7 @@
pmd->tl_info.tm = pmd->tm;
pmd->tl_info.levels = 1;
- pmd->tl_info.value_type.context = &pmd->info;
+ pmd->tl_info.value_type.context = &pmd->bl_info;
pmd->tl_info.value_type.size = sizeof(__le64);
pmd->tl_info.value_type.inc = subtree_inc;
pmd->tl_info.value_type.dec = subtree_dec;
diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index 371f3d4..4caf669 100644
--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -230,6 +230,11 @@
dm_tm_unlock(s->tm, f->b);
}
+static bool is_internal_level(struct dm_btree_info *info, struct frame *f)
+{
+ return f->level < (info->levels - 1);
+}
+
int dm_btree_del(struct dm_btree_info *info, dm_block_t root)
{
int r;
@@ -241,7 +246,7 @@
s->tm = info->tm;
s->top = -1;
- r = push_frame(s, root, 1);
+ r = push_frame(s, root, 0);
if (r)
goto out;
@@ -267,7 +272,7 @@
if (r)
goto out;
- } else if (f->level != (info->levels - 1)) {
+ } else if (is_internal_level(info, f)) {
b = value64(f->n, f->current_child);
f->current_child++;
r = push_frame(s, b, f->level + 1);