btrfs: send: do not BUG_ON() on unexpected symlink data extent

There's really no need to BUG_ON() if we find a symlink with an extent
that is not inline or is compressed. We can just make send fail with
an error (-EUCLEAN) and log an informative error message, so just do
that instead of BUG_ON().

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index af2e153..8bfd447 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1774,9 +1774,21 @@ static int read_symlink(struct btrfs_root *root,
        ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
                        struct btrfs_file_extent_item);
        type = btrfs_file_extent_type(path->nodes[0], ei);
+       if (unlikely(type != BTRFS_FILE_EXTENT_INLINE)) {
+               ret = -EUCLEAN;
+               btrfs_crit(root->fs_info,
+"send: found symlink extent that is not inline, ino %llu root %llu extent type %d",
+                          ino, btrfs_root_id(root), type);
+               goto out;
+       }
        compression = btrfs_file_extent_compression(path->nodes[0], ei);
-       BUG_ON(type != BTRFS_FILE_EXTENT_INLINE);
-       BUG_ON(compression);
+       if (unlikely(compression != BTRFS_COMPRESS_NONE)) {
+               ret = -EUCLEAN;
+               btrfs_crit(root->fs_info,
+"send: found symlink extent with compression, ino %llu root %llu compression type %d",
+                          ino, btrfs_root_id(root), compression);
+               goto out;
+       }
 
        off = btrfs_file_extent_inline_start(ei);
        len = btrfs_file_extent_ram_bytes(path->nodes[0], ei);