[PATCH 3.10 070/173] dm array: fix bug in growing array

Greg Kroah-Hartman
2013-12-02T19:10:53Z

From: Joe Thornber <ejt@redhat.com>

commit 9c1d4de56066e4d6abc66ec188faafd7b303fb08 upstream.

Entries would be lost if the old tail block was partially filled.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/persistent-data/dm-array.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/md/persistent-data/dm-array.c
+++ b/drivers/md/persistent-data/dm-array.c
@@ -509,15 +509,18 @@ static int grow_add_tail_block(struct re
static int grow_needs_more_blocks(struct resize *resize)
{
int r;
+ unsigned old_nr_blocks = resize->old_nr_full_blocks;

if (resize->old_nr_entries_in_last_block > 0) {
+ old_nr_blocks++;
+
r = grow_extend_tail_block(resize, resize->max_entries);
if (r)
return r;
}

r = insert_full_ablocks(resize->info, resize->size_of_block,
- resize->old_nr_full_blocks,
+ old_nr_blocks,
resize->new_nr_full_blocks,
resize->max_entries, resize->value,
&resize->root);