Hi ,list,
extent tree es_len can be zero?
if we call ext4_es_end when es_len is zero, it will have problem.
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 95796a1..49a8da2 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -108,7 +108,7 @@
* tree are ordered by logical block no.
*
* -- operations on a extent status tree
- * There are three important operations on a delayed extent tree: find
+ * There are three important operations on a delayed extent tree: finding
* next extent, adding a extent(a range of blocks) and removing a extent.
*
* -- race on a extent status tree
@@ -195,7 +195,7 @@ static void ext4_es_print_tree(struct inode *inode)
static inline ext4_lblk_t ext4_es_end(struct extent_status *es)
{
- BUG_ON(es->es_lblk + es->es_len < es->es_lblk);
+ BUG_ON(es->es_lblk + es->es_len <= es->es_lblk);
return es->es_lblk + es->es_len - 1;
}
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