btrfs: remove extent_map::block_len member

The extent_map::block_len is either extent_map::len (non-compressed
extent) or extent_map::disk_num_bytes (compressed extent).

Since we already have sanity checks to do the cross-checks between the
new and old members, we can drop the old extent_map::block_len now.

For most call sites, they can manually select extent_map::len or
extent_map::disk_num_bytes, since most if not all of them have checked
if the extent is compressed.

Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Qu Wenruo <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 4f6d748aa99e..cd88432e7072 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -585,7 +585,7 @@ void btrfs_submit_compressed_read(struct btrfs_bio *bbio)
 	}
 
 	ASSERT(extent_map_is_compressed(em));
-	compressed_len = em->block_len;
+	compressed_len = em->disk_num_bytes;
 
 	cb = alloc_compressed_bio(inode, file_offset, REQ_OP_READ,
 				  end_bbio_compressed_read);