btrfs: update stripe_extent delete loop assumptions

btrfs_delete_raid_extent() was written under the assumption, that it's call-chain always passes a start, length tuple that matches a single extent. But btrfs_delete_raid_extent() is called by do_free_extent_accounting() which in turn is called by __btrfs_free_extent(). But this call-chain passes in a start address and a length that can possibly match multiple on-disk extents. To make this possible, we have to adjust the start and length of each btree node lookup, to not delete beyond the requested range. Reviewed-by: Qu Wenruo <[email protected]> Signed-off-by: Johannes Thumshirn <[email protected]> Signed-off-by: David Sterba <[email protected]>
mj22226 · Sep 10, 2024 · 7fa5230 · 7fa5230
1 parent 8c4cba2
commit 7fa5230
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/fs/btrfs/raid-stripe-tree.c b/fs/btrfs/raid-stripe-tree.c
@@ -66,6 +66,11 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
 		if (ret)
 			break;
 
+		start += key.offset;
+		length -= key.offset;
+		if (length == 0)
+			break;
+
 		btrfs_release_path(path);
 	}