With btrfs-corrupt-block, one can drop one chunk item and mounting
will end up with a panic in btrfs_full_stripe_len().
This doesn't not remove the BUG_ON, but instead checks it a bit
earlier when we find the block group item.
Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 689d25a..d860291 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9662,7 +9662,22 @@ static int find_first_block_group(struct btrfs_root *root,
if (found_key.objectid >= key->objectid &&
found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
- ret = 0;
+ struct extent_map_tree *em_tree;
+ struct extent_map *em;
+
+ em_tree = &root->fs_info->mapping_tree.map_tree;
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, found_key.objectid,
+ found_key.offset);
+ read_unlock(&em_tree->lock);
+ if (!em) {
+ btrfs_err(root->fs_info,
+ "logical %llu len %llu found bg but no related chunk",
+ found_key.objectid, found_key.offset);
+ ret = -ENOENT;
+ } else {
+ ret = 0;
+ }
goto out;
}
path->slots[0]++;
--
2.5.5
--
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