Hmm, for some reason there are some items with objectid=0 and type=0 betwenn CHUNK_ITEM_KEYs, and thus the reading breaks before reading all items. I am not sure if this is an error in our driver or there really are such items, but yout patch solves this.

Reviewed-by: Marek Behun marek.behun@nic.cz

On Tue, 5 Jun 2018 13:11:01 +0300 Yevgeny Popovych yevgenyp@pointgrab.com wrote:

This causes errors when translating logical addresses to physical: btrfs_map_logical_to_physical: Cannot map logical address <addr> to physical btrfs_file_read: Error reading extent

The behavior of btrfs_map_logical_to_physical() is to stop traversing CHUNK_TREE when it encounters first non-CHUNK_ITEM, which makes only some portion of CHUNK_ITEMs being read. Change it to skip over non-chunk items.

Signed-off-by: Yevgeny Popovych yevgenyp@pointgrab.com Cc: Marek Behun marek.behun@nic.cz Cc: Sergey Struzh sergeys@pointgrab.com

---

fs/btrfs/chunk-map.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c index b3b5ef7..beb6a4b 100644 --- a/fs/btrfs/chunk-map.c +++ b/fs/btrfs/chunk-map.c @@ -158,7 +158,7 @@ int btrfs_read_chunk_tree(void) do { found_key = btrfs_path_leaf_key(&path); if (btrfs_comp_keys_type(&key, found_key))

• 	break;
  

• 	continue;
  
  

  chunk = btrfs_path_item_ptr(&path, struct

btrfs_chunk); btrfs_chunk_to_cpu(chunk);